/* roulang page: index */
:root {
            --xk-primary: #2563eb;
            --xk-primary-hover: #1d4ed8;
            --xk-primary-light: #3b82f6;
            --xk-deep: #0f1f3d;
            --xk-deep-mid: #142d4c;
            --xk-bg: #ffffff;
            --xk-bg-soft: #f7f9fb;
            --xk-bg-blue: #eaf1fb;
            --xk-text: #1a2b4a;
            --xk-text-muted: #5b6b84;
            --xk-text-light: #8a97ad;
            --xk-border: #e3e8ef;
            --xk-border-hover: #b8c9e0;
            --xk-radius-card: 12px;
            --xk-radius-btn: 8px;
            --xk-radius-search: 28px;
            --xk-radius-badge: 6px;
            --xk-shadow-sm: 0 2px 8px rgba(15, 31, 61, 0.06);
            --xk-shadow-md: 0 4px 16px rgba(15, 31, 61, 0.10);
            --xk-shadow-hover: 0 8px 24px rgba(15, 31, 61, 0.14);
            --xk-font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
            --xk-transition: 200ms ease;
            --xk-transition-slow: 320ms cubic-bezier(0.4, 0, 0.2, 1);
            --xk-section-padding: 88px;
            --xk-header-height: 76px;
        }
        @media (max-width: 991.98px) {
            :root {
                --xk-section-padding: 56px;
            }
        }
        @media (max-width: 767.98px) {
            :root {
                --xk-section-padding: 44px;
            }
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--xk-font-sans);
            font-size: 16px;
            line-height: 1.75;
            color: var(--xk-text);
            background-color: var(--xk-bg);
            overflow-x: hidden;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--xk-primary);
            text-decoration: none;
            transition: color var(--xk-transition);
        }

        a:hover {
            color: var(--xk-primary-hover);
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.35);
            outline-offset: 2px;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--xk-text);
            margin-bottom: 1rem;
        }

        h1 {
            font-size: clamp(1.85rem, 4vw, 3rem);
            line-height: 1.28;
        }

        h2 {
            font-size: clamp(1.55rem, 2.8vw, 2.1rem);
            line-height: 1.35;
        }

        h3 {
            font-size: 1.25rem;
            line-height: 1.4;
        }

        p {
            margin-bottom: 1rem;
            color: var(--xk-text-muted);
        }

        .container {
            max-width: 1170px;
            width: 100%;
            padding-left: 20px;
            padding-right: 20px;
            margin-left: auto;
            margin-right: auto;
        }

        @media (min-width: 1200px) {
            .container {
                max-width: 1170px;
            }
        }

        .section {
            padding: var(--xk-section-padding) 0;
            position: relative;
        }

        .section-soft {
            background-color: var(--xk-bg-soft);
        }

        .section-blue-tint {
            background-color: var(--xk-bg-blue);
        }

        .section-deep {
            background-color: var(--xk-deep);
        }

        .section-deep h2,
        .section-deep h3,
        .section-deep p {
            color: #e6edf7;
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.08);
            border: 1px solid rgba(37, 99, 235, 0.18);
            padding: 4px 12px;
            border-radius: var(--xk-radius-badge);
            margin-bottom: 1rem;
        }

        .section-title-wrap {
            margin-bottom: 2.5rem;
        }

        .section-title-wrap .section-desc {
            max-width: 720px;
            font-size: 1rem;
            color: var(--xk-text-muted);
            line-height: 1.8;
            margin-top: 0.75rem;
        }

        .btn {
            font-weight: 600;
            border-radius: var(--xk-radius-btn);
            padding: 0.65rem 1.5rem;
            font-size: 0.95rem;
            transition: all var(--xk-transition);
            border: 1px solid transparent;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            justify-content: center;
        }

        .btn-primary {
            background-color: var(--xk-primary);
            border-color: var(--xk-primary);
            color: #ffffff;
        }

        .btn-primary:hover,
        .btn-primary:focus {
            background-color: var(--xk-primary-hover);
            border-color: var(--xk-primary-hover);
            color: #ffffff;
            box-shadow: var(--xk-shadow-md);
        }

        .btn-primary:active {
            background-color: #1e40af;
            border-color: #1e40af;
            box-shadow: none;
        }

        .btn-outline-primary {
            background-color: transparent;
            border-color: var(--xk-primary);
            color: var(--xk-primary);
        }

        .btn-outline-primary:hover,
        .btn-outline-primary:focus {
            background-color: var(--xk-primary);
            border-color: var(--xk-primary);
            color: #ffffff;
            box-shadow: var(--xk-shadow-md);
        }

        .btn-outline-light {
            background-color: transparent;
            border-color: rgba(255, 255, 255, 0.5);
            color: #ffffff;
        }

        .btn-outline-light:hover,
        .btn-outline-light:focus {
            background-color: rgba(255, 255, 255, 0.12);
            border-color: #ffffff;
            color: #ffffff;
        }

        .btn-sm {
            padding: 0.4rem 0.9rem;
            font-size: 0.85rem;
        }

        .btn-lg {
            padding: 0.8rem 2rem;
            font-size: 1rem;
        }

        /* Header / Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background-color: #ffffff;
            border-bottom: 1px solid var(--xk-border);
            min-height: var(--xk-header-height);
            display: flex;
            align-items: center;
            transition: box-shadow var(--xk-transition);
        }

        .site-header.scrolled {
            box-shadow: 0 2px 12px rgba(15, 31, 61, 0.08);
        }

        .nav-wrap {
            display: flex;
            align-items: center;
            width: 100%;
            gap: 16px;
            flex-wrap: nowrap;
        }

        .navbar-brand-xk {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--xk-deep);
            white-space: nowrap;
            flex-shrink: 0;
        }

        .navbar-brand-xk .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--xk-deep), var(--xk-primary));
            border-radius: 8px;
            color: #ffffff;
            font-size: 1rem;
            flex-shrink: 0;
        }

        .navbar-brand-xk:hover {
            color: var(--xk-deep);
        }

        .search-box-nav {
            flex: 1 1 auto;
            max-width: 360px;
            min-width: 160px;
            position: relative;
        }

        .search-box-nav input {
            width: 100%;
            border: 1.5px solid var(--xk-border);
            border-radius: var(--xk-radius-search);
            padding: 0.55rem 2.5rem 0.55rem 1.2rem;
            font-size: 0.9rem;
            color: var(--xk-text);
            background-color: var(--xk-bg-soft);
            transition: all var(--xk-transition);
            outline: none;
        }

        .search-box-nav input::placeholder {
            color: var(--xk-text-light);
            font-size: 0.85rem;
        }

        .search-box-nav input:focus {
            border-color: var(--xk-primary);
            background-color: #ffffff;
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
        }

        .search-box-nav .search-icon {
            position: absolute;
            right: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--xk-text-light);
            font-size: 0.95rem;
            pointer-events: none;
            transition: color var(--xk-transition);
        }

        .search-box-nav input:focus+.search-icon {
            color: var(--xk-primary);
        }

        .nav-links-xk {
            display: flex;
            align-items: center;
            gap: 2px;
            list-style: none;
            margin: 0;
            padding: 0;
            flex-shrink: 0;
        }

        .nav-links-xk .nav-item-xk {
            position: relative;
        }

        .nav-links-xk .nav-link-xk {
            display: block;
            padding: 0.5rem 0.85rem;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--xk-text-muted);
            border-radius: var(--xk-radius-btn);
            transition: all var(--xk-transition);
            white-space: nowrap;
        }

        .nav-links-xk .nav-link-xk:hover {
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.06);
        }

        .nav-links-xk .nav-link-xk.active {
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.1);
            font-weight: 600;
        }

        .nav-toggle-xk {
            display: none;
            background: none;
            border: 1px solid var(--xk-border);
            border-radius: 8px;
            padding: 0.4rem 0.7rem;
            font-size: 1.1rem;
            color: var(--xk-text);
            cursor: pointer;
            transition: all var(--xk-transition);
            flex-shrink: 0;
        }

        .nav-toggle-xk:hover {
            background-color: var(--xk-bg-soft);
            border-color: var(--xk-border-hover);
        }

        @media (max-width: 991.98px) {
            .nav-wrap {
                flex-wrap: wrap;
                gap: 10px;
            }
            .search-box-nav {
                order: 3;
                flex-basis: 100%;
                max-width: 100%;
                min-width: 100%;
            }
            .navbar-brand-xk {
                flex-shrink: 1;
            }
            .nav-toggle-xk {
                display: block;
                margin-left: auto;
            }
            .nav-links-xk {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                gap: 2px;
                padding: 0.5rem 0;
                border-top: 1px solid var(--xk-border);
                margin-top: 4px;
            }
            .nav-links-xk.open {
                display: flex;
            }
            .nav-links-xk .nav-link-xk {
                padding: 0.7rem 0.5rem;
                font-size: 0.95rem;
            }
        }

        /* Hero */
        .hero-xk {
            position: relative;
            background-color: var(--xk-bg);
            overflow: hidden;
            padding: 3.5rem 0 4rem;
        }

        .hero-xk::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(234, 241, 251, 0.8) 0%, rgba(247, 249, 251, 0.4) 45%, rgba(255, 255, 255, 0.9) 100%);
            z-index: 0;
        }

        .hero-content {
            position: relative;
            z-index: 1;
        }

        .hero-bg-image {
            position: absolute;
            top: 0;
            right: 0;
            width: 46%;
            height: 100%;
            z-index: 0;
            pointer-events: none;
        }

        .hero-bg-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.15;
            -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0) 100%);
            mask-image: linear-gradient(to left, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0) 100%);
        }

        .hero-inner {
            min-height: 400px;
            display: flex;
            align-items: center;
        }

        .hero-title {
            font-size: clamp(1.7rem, 4.5vw, 3rem);
            font-weight: 800;
            color: var(--xk-deep);
            margin-bottom: 1rem;
            letter-spacing: -0.01em;
            line-height: 1.3;
        }

        .hero-desc {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--xk-text-muted);
            max-width: 620px;
            margin-bottom: 1.5rem;
        }

        .hero-cta-row {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 2rem;
        }

        .hero-data-row {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-top: 1.5rem;
        }

        .hero-data-item {
            display: flex;
            flex-direction: column;
        }

        .hero-data-item .hero-data-num {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--xk-deep);
            line-height: 1.2;
        }

        .hero-data-item .hero-data-label {
            font-size: 0.8rem;
            color: var(--xk-text-light);
            margin-top: 2px;
        }

        @media (max-width: 767.98px) {
            .hero-xk {
                padding: 2.5rem 0;
            }
            .hero-bg-image {
                width: 100%;
                height: 220px;
                top: auto;
                bottom: 0;
                opacity: 0.08;
            }
            .hero-inner {
                min-height: auto;
            }
            .hero-desc {
                font-size: 0.95rem;
                max-width: 100%;
            }
            .hero-cta-row .btn {
                width: 100%;
            }
        }

        /* Data Strip */
        .data-strip {
            background-color: #ffffff;
            border-top: 1px solid var(--xk-border);
            border-bottom: 1px solid var(--xk-border);
            padding: 1.8rem 0;
        }

        .data-strip-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .data-strip-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 0 16px;
            border-right: 1px solid var(--xk-border);
        }

        .data-strip-item:last-child {
            border-right: none;
        }

        .data-strip-icon {
            width: 44px;
            height: 44px;
            flex-shrink: 0;
            background-color: var(--xk-bg-blue);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--xk-primary);
            font-size: 1.2rem;
        }

        .data-strip-text strong {
            display: block;
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--xk-deep);
            line-height: 1.25;
        }

        .data-strip-text span {
            font-size: 0.82rem;
            color: var(--xk-text-muted);
        }

        @media (max-width: 991.98px) {
            .data-strip-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .data-strip-item {
                padding: 8px 12px;
                border-right: none;
                border-bottom: 1px solid var(--xk-border);
            }
            .data-strip-item:nth-child(odd) {
                border-right: 1px solid var(--xk-border);
            }
            .data-strip-item:nth-child(3),
            .data-strip-item:nth-child(4) {
                border-bottom: none;
            }
        }

        @media (max-width: 575.98px) {
            .data-strip-grid {
                grid-template-columns: 1fr;
            }
            .data-strip-item {
                border-right: none;
                border-bottom: 1px solid var(--xk-border);
            }
            .data-strip-item:nth-child(odd) {
                border-right: none;
            }
            .data-strip-item:nth-child(3) {
                border-bottom: 1px solid var(--xk-border);
            }
            .data-strip-item:last-child {
                border-bottom: none;
            }
        }

        /* Cards */
        .card-xk {
            background-color: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            padding: 24px;
            box-shadow: var(--xk-shadow-sm);
            transition: all var(--xk-transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .card-xk:hover {
            border-color: var(--xk-border-hover);
            box-shadow: var(--xk-shadow-hover);
            transform: translateY(-3px);
        }

        .card-icon-xk {
            width: 48px;
            height: 48px;
            background-color: var(--xk-bg-blue);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--xk-primary);
            font-size: 1.3rem;
            margin-bottom: 1rem;
            flex-shrink: 0;
        }

        .card-xk h3 {
            font-size: 1.15rem;
            margin-bottom: 0.6rem;
        }

        .card-xk p {
            font-size: 0.92rem;
            line-height: 1.75;
            color: var(--xk-text-muted);
            margin-bottom: 0;
        }

        .card-grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .card-grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        @media (max-width: 991.98px) {
            .card-grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 767.98px) {
            .card-grid-3,
            .card-grid-2 {
                grid-template-columns: 1fr;
            }
            .card-xk {
                padding: 18px;
            }
        }

        /* Scene cards */
        .scene-card {
            background: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            overflow: hidden;
            box-shadow: var(--xk-shadow-sm);
            transition: all var(--xk-transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .scene-card:hover {
            border-color: var(--xk-border-hover);
            box-shadow: var(--xk-shadow-hover);
            transform: translateY(-3px);
        }

        .scene-card .scene-img-wrap {
            height: 180px;
            overflow: hidden;
            background-color: var(--xk-bg-soft);
            position: relative;
        }

        .scene-card .scene-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s cubic-bezier(0.2, 0.6, 0.2, 1);
        }

        .scene-card:hover .scene-img-wrap img {
            transform: scale(1.04);
        }

        .scene-card .scene-body {
            padding: 20px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .scene-card .scene-body h3 {
            font-size: 1.1rem;
            margin-bottom: 8px;
        }

        .scene-card .scene-body p {
            font-size: 0.9rem;
            color: var(--xk-text-muted);
            margin-bottom: 0;
            line-height: 1.7;
        }

        /* News list */
        .news-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .news-list-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            padding: 20px 0;
            border-bottom: 1px solid var(--xk-border);
            transition: background-color var(--xk-transition);
        }

        .news-list-item:first-child {
            padding-top: 0;
        }

        .news-list-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .news-list-item:hover {
            background-color: var(--xk-bg-soft);
            border-radius: 4px;
        }

        .news-date {
            flex-shrink: 0;
            min-width: 70px;
            text-align: center;
            background-color: var(--xk-bg-blue);
            border-radius: 8px;
            padding: 8px 6px;
            font-size: 0.8rem;
            color: var(--xk-primary);
            font-weight: 600;
            line-height: 1.3;
        }

        .news-body {
            flex: 1;
        }

        .news-body h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .news-body h4 a {
            color: var(--xk-text);
        }

        .news-body h4 a:hover {
            color: var(--xk-primary);
        }

        .news-body p {
            font-size: 0.88rem;
            color: var(--xk-text-muted);
            margin-bottom: 8px;
            line-height: 1.7;
        }

        .news-readmore {
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--xk-primary);
            transition: all var(--xk-transition);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .news-readmore:hover {
            color: var(--xk-primary-hover);
            gap: 8px;
        }

        @media (max-width: 575.98px) {
            .news-list-item {
                flex-direction: column;
                gap: 10px;
                padding: 16px 0;
            }
            .news-date {
                min-width: auto;
                display: inline-block;
                padding: 4px 12px;
            }
        }

        /* Comparison table */
        .compare-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .compare-card {
            border-radius: var(--xk-radius-card);
            padding: 28px;
            border: 1px solid var(--xk-border);
            background-color: #ffffff;
            box-shadow: var(--xk-shadow-sm);
        }

        .compare-card.compare-old {
            background-color: var(--xk-bg-soft);
            border-color: #dce2ea;
        }

        .compare-card.compare-new {
            background-color: #ffffff;
            border-color: var(--xk-primary);
            box-shadow: 0 4px 20px rgba(37, 99, 235, 0.1);
        }

        .compare-card h3 {
            font-size: 1.1rem;
            margin-bottom: 1.2rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .compare-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .compare-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 8px 0;
            font-size: 0.9rem;
            color: var(--xk-text-muted);
            line-height: 1.6;
        }

        .compare-list li i {
            margin-top: 4px;
            flex-shrink: 0;
        }

        .compare-old .compare-list li i {
            color: #94a3b8;
        }

        .compare-new .compare-list li i {
            color: var(--xk-primary);
        }

        @media (max-width: 767.98px) {
            .compare-grid {
                grid-template-columns: 1fr;
            }
        }

        /* FAQ */
        .accordion-xk {
            background-color: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            overflow: hidden;
        }

        .accordion-item-xk {
            border-bottom: 1px solid var(--xk-border);
        }

        .accordion-item-xk:last-child {
            border-bottom: none;
        }

        .accordion-header-xk {
            padding: 0;
        }

        .accordion-btn-xk {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 1rem 1.5rem;
            background: none;
            border: none;
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--xk-text);
            cursor: pointer;
            text-align: left;
            transition: all var(--xk-transition);
            line-height: 1.5;
        }

        .accordion-btn-xk:hover {
            background-color: var(--xk-bg-soft);
            color: var(--xk-primary);
        }

        .accordion-btn-xk .accordion-icon-xk {
            flex-shrink: 0;
            font-size: 0.9rem;
            color: var(--xk-text-light);
            transition: transform var(--xk-transition);
        }

        .accordion-item-xk.open .accordion-btn-xk .accordion-icon-xk {
            transform: rotate(45deg);
            color: var(--xk-primary);
        }

        .accordion-body-xk {
            max-height: 0;
            overflow: hidden;
            transition: max-height 300ms cubic-bezier(0.2, 0.6, 0.2, 1);
        }

        .accordion-body-inner {
            padding: 0 1.5rem 1.2rem;
            font-size: 0.92rem;
            color: var(--xk-text-muted);
            line-height: 1.8;
        }

        .accordion-item-xk.open .accordion-body-xk {
            max-height: 300px;
        }

        /* Guarantee strip */
        .guarantee-strip {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
        }

        .guarantee-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 16px;
            background-color: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            box-shadow: var(--xk-shadow-sm);
            transition: all var(--xk-transition);
        }

        .guarantee-item:hover {
            border-color: var(--xk-border-hover);
            box-shadow: var(--xk-shadow-md);
        }

        .guarantee-icon {
            width: 36px;
            height: 36px;
            flex-shrink: 0;
            background-color: var(--xk-bg-blue);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--xk-primary);
            font-size: 0.95rem;
        }

        .guarantee-text {
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--xk-text);
            line-height: 1.4;
        }

        @media (max-width: 991.98px) {
            .guarantee-strip {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 575.98px) {
            .guarantee-strip {
                grid-template-columns: 1fr;
            }
        }

        /* Topic cards */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .topic-card {
            display: block;
            background-color: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            padding: 20px;
            text-align: left;
            box-shadow: var(--xk-shadow-sm);
            transition: all var(--xk-transition);
            color: var(--xk-text);
            height: 100%;
        }

        .topic-card:hover {
            border-color: var(--xk-primary);
            box-shadow: var(--xk-shadow-hover);
            transform: translateY(-3px);
            color: var(--xk-text);
        }

        .topic-card-icon {
            width: 40px;
            height: 40px;
            background-color: var(--xk-bg-blue);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--xk-primary);
            font-size: 1rem;
            margin-bottom: 12px;
        }

        .topic-card h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 6px;
        }

        .topic-card span {
            font-size: 0.82rem;
            color: var(--xk-text-muted);
            line-height: 1.6;
        }

        @media (max-width: 991.98px) {
            .topic-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 575.98px) {
            .topic-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Deep content */
        .deep-content {
            max-width: 820px;
            margin: 0 auto;
            font-size: 1rem;
            line-height: 1.9;
            color: var(--xk-text-muted);
        }

        .deep-content h3 {
            margin-top: 2rem;
            font-size: 1.2rem;
            color: var(--xk-text);
        }

        .deep-content p {
            margin-bottom: 1.2rem;
        }

        .deep-content .deep-highlight {
            background-color: var(--xk-bg-blue);
            border-left: 4px solid var(--xk-primary);
            padding: 16px 20px;
            border-radius: 0 var(--xk-radius-card) var(--xk-radius-card) 0;
            margin: 1.5rem 0;
            font-style: normal;
            color: var(--xk-text);
            font-size: 0.95rem;
        }

        /* Brand intro */
        .brand-intro-block {
            max-width: 820px;
            margin: 0 auto;
            text-align: left;
        }

        .brand-intro-block p {
            font-size: 1rem;
            line-height: 1.9;
            color: var(--xk-text-muted);
        }

        /* Steps */
        .steps-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            counter-reset: step-counter;
        }

        .step-item {
            position: relative;
            background-color: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            padding: 24px;
            box-shadow: var(--xk-shadow-sm);
            transition: all var(--xk-transition);
            counter-increment: step-counter;
        }

        .step-item::before {
            content: counter(step-counter);
            position: absolute;
            top: -14px;
            left: 20px;
            width: 32px;
            height: 32px;
            background-color: var(--xk-primary);
            border-radius: 50%;
            color: #ffffff;
            font-weight: 700;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--xk-shadow-md);
        }

        .step-item:hover {
            border-color: var(--xk-border-hover);
            box-shadow: var(--xk-shadow-hover);
            transform: translateY(-3px);
        }

        .step-item h4 {
            font-size: 1.05rem;
            margin-bottom: 8px;
            margin-top: 0.5rem;
        }

        .step-item p {
            font-size: 0.9rem;
            color: var(--xk-text-muted);
            margin-bottom: 0;
            line-height: 1.7;
        }

        @media (max-width: 767.98px) {
            .steps-row {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .step-item::before {
                top: -10px;
                left: 12px;
                width: 28px;
                height: 28px;
                font-size: 0.82rem;
            }
        }

        /* CTA final */
        .cta-final {
            background: linear-gradient(135deg, var(--xk-deep) 0%, var(--xk-deep-mid) 100%);
            border-radius: var(--xk-radius-card);
            padding: 3.5rem 2rem;
            text-align: center;
            box-shadow: var(--xk-shadow-md);
        }

        .cta-final h2 {
            color: #ffffff;
            font-size: clamp(1.5rem, 2.5vw, 2rem);
            margin-bottom: 0.8rem;
        }

        .cta-final p {
            color: rgba(230, 237, 247, 0.75);
            max-width: 560px;
            margin: 0 auto 1.8rem;
            font-size: 0.95rem;
            line-height: 1.8;
        }

        /* Footer */
        .site-footer {
            background-color: var(--xk-deep);
            color: rgba(230, 237, 247, 0.7);
            padding-top: 3rem;
            padding-bottom: 1.5rem;
            flex-shrink: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 2rem;
            border-bottom: 1px solid rgba(230, 237, 247, 0.15);
        }

        .footer-brand .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, #1e3a5f, var(--xk-primary));
            border-radius: 8px;
            color: #ffffff;
            font-size: 1rem;
            margin-right: 8px;
        }

        .footer-brand .footer-brand-name {
            font-size: 1.2rem;
            font-weight: 700;
            color: #ffffff;
            display: flex;
            align-items: center;
        }

        .footer-brand p {
            font-size: 0.85rem;
            color: rgba(230, 237, 247, 0.55);
            margin-top: 0.8rem;
            line-height: 1.7;
            margin-bottom: 0;
        }

        .footer-col h5 {
            font-size: 0.85rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 1rem;
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .footer-col ul li {
            margin-bottom: 0.6rem;
        }

        .footer-col ul li a {
            font-size: 0.85rem;
            color: rgba(230, 237, 247, 0.6);
            transition: all var(--xk-transition);
        }

        .footer-col ul li a:hover {
            color: #ffffff;
            padding-left: 4px;
        }

        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding-top: 1.5rem;
            font-size: 0.8rem;
            color: rgba(230, 237, 247, 0.5);
        }

        .footer-bottom a {
            color: rgba(230, 237, 247, 0.6);
            font-size: 0.8rem;
        }

        .footer-bottom a:hover {
            color: #ffffff;
        }

        .footer-icp {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 0.78rem;
            color: rgba(230, 237, 247, 0.45);
        }

        @media (max-width: 991.98px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 575.98px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }

        /* Bottom fixed CTA bar */
        .fixed-cta-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1030;
            background-color: #ffffff;
            border-top: 1px solid var(--xk-border);
            box-shadow: 0 -4px 16px rgba(15, 31, 61, 0.1);
            padding: 10px 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            transform: translateY(0);
            transition: transform 350ms cubic-bezier(0.2, 0.6, 0.2, 1);
        }

        .fixed-cta-bar.hidden-bottom {
            transform: translateY(100%);
        }

        .fixed-cta-bar .fixed-cta-text {
            font-size: 0.88rem;
            color: var(--xk-text);
            font-weight: 500;
        }

        .fixed-cta-bar .btn {
            white-space: nowrap;
        }

        @media (max-width: 575.98px) {
            .fixed-cta-bar {
                padding: 8px 12px;
                gap: 10px;
                flex-wrap: wrap;
            }
            .fixed-cta-bar .fixed-cta-text {
                font-size: 0.78rem;
            }
            .fixed-cta-bar .btn {
                padding: 0.45rem 1rem;
                font-size: 0.85rem;
            }
        }

        /* Misc */
        .bg-cover-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .text-muted-xk {
            color: var(--xk-text-muted);
        }
        .mt-0 {
            margin-top: 0;
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .gap-16 {
            gap: 16px;
        }
        .fw-700 {
            font-weight: 700;
        }
        .rounded-card {
            border-radius: var(--xk-radius-card);
        }

/* roulang page: category2 */
:root {
            --xk-primary: #2563eb;
            --xk-primary-hover: #1d4ed8;
            --xk-primary-light: #3b82f6;
            --xk-deep: #0f1f3d;
            --xk-deep-mid: #142d4c;
            --xk-bg: #ffffff;
            --xk-bg-soft: #f7f9fb;
            --xk-bg-blue: #eaf1fb;
            --xk-text: #1a2b4a;
            --xk-text-muted: #5b6b84;
            --xk-text-light: #8a97ad;
            --xk-border: #e3e8ef;
            --xk-border-hover: #b8c9e0;
            --xk-radius-card: 12px;
            --xk-radius-btn: 8px;
            --xk-radius-search: 28px;
            --xk-radius-badge: 6px;
            --xk-shadow-sm: 0 2px 8px rgba(15, 31, 61, 0.06);
            --xk-shadow-md: 0 4px 16px rgba(15, 31, 61, 0.10);
            --xk-shadow-hover: 0 8px 24px rgba(15, 31, 61, 0.14);
            --xk-font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
            --xk-transition: 200ms ease;
            --xk-transition-slow: 320ms cubic-bezier(0.4, 0, 0.2, 1);
            --xk-section-padding: 88px;
            --xk-header-height: 76px;
        }

        @media (max-width: 991.98px) {
            :root {
                --xk-section-padding: 56px;
            }
        }
        @media (max-width: 575.98px) {
            :root {
                --xk-section-padding: 44px;
            }
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--xk-font-sans);
            font-size: 16px;
            line-height: 1.75;
            color: var(--xk-text);
            background-color: var(--xk-bg);
            overflow-x: hidden;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--xk-primary);
            text-decoration: none;
            transition: color var(--xk-transition);
        }
        a:hover {
            color: var(--xk-primary-hover);
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.35);
            outline-offset: 2px;
        }
        .container {
            max-width: 1170px;
            width: 100%;
            padding-left: 20px;
            padding-right: 20px;
            margin-left: auto;
            margin-right: auto;
        }
        .section {
            padding: var(--xk-section-padding) 0;
            position: relative;
        }
        .section-soft {
            background-color: var(--xk-bg-soft);
        }
        .section-blue-tint {
            background-color: var(--xk-bg-blue);
        }
        .section-deep {
            background-color: var(--xk-deep);
        }
        .section-deep h2,
        .section-deep h3,
        .section-deep p {
            color: #e6edf7;
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.08);
            border: 1px solid rgba(37, 99, 235, 0.18);
            padding: 4px 12px;
            border-radius: var(--xk-radius-badge);
            margin-bottom: 1rem;
        }
        .section-title-wrap {
            margin-bottom: 2.5rem;
        }
        .section-title-wrap .section-desc {
            max-width: 720px;
            font-size: 1rem;
            color: var(--xk-text-muted);
            line-height: 1.8;
            margin-top: 0.75rem;
        }
        .btn {
            font-weight: 600;
            border-radius: var(--xk-radius-btn);
            padding: 0.65rem 1.5rem;
            font-size: 0.95rem;
            transition: all var(--xk-transition);
            border: 1px solid transparent;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            justify-content: center;
        }
        .btn-primary {
            background-color: var(--xk-primary);
            border-color: var(--xk-primary);
            color: #ffffff;
        }
        .btn-primary:hover,
        .btn-primary:focus {
            background-color: var(--xk-primary-hover);
            border-color: var(--xk-primary-hover);
            color: #ffffff;
            box-shadow: var(--xk-shadow-md);
        }
        .btn-primary:active {
            background-color: #1e40af;
            border-color: #1e40af;
            box-shadow: none;
        }
        .btn-outline-primary {
            background-color: transparent;
            border-color: var(--xk-primary);
            color: var(--xk-primary);
        }
        .btn-outline-primary:hover,
        .btn-outline-primary:focus {
            background-color: var(--xk-primary);
            border-color: var(--xk-primary);
            color: #ffffff;
            box-shadow: var(--xk-shadow-md);
        }
        .btn-outline-light {
            background-color: transparent;
            border-color: rgba(255, 255, 255, 0.5);
            color: #ffffff;
        }
        .btn-outline-light:hover,
        .btn-outline-light:focus {
            background-color: rgba(255, 255, 255, 0.12);
            border-color: #ffffff;
            color: #ffffff;
        }
        .btn-sm {
            padding: 0.4rem 0.9rem;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 0.8rem 2rem;
            font-size: 1rem;
        }

        /* Header / Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background-color: #ffffff;
            border-bottom: 1px solid var(--xk-border);
            min-height: var(--xk-header-height);
            display: flex;
            align-items: center;
            transition: box-shadow var(--xk-transition);
        }
        .site-header.scrolled {
            box-shadow: var(--xk-shadow-sm);
        }
        .nav-wrap {
            display: flex;
            align-items: center;
            gap: 1.25rem;
            flex-wrap: wrap;
            padding: 0.6rem 0;
        }
        .navbar-brand-xk {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--xk-deep);
            white-space: nowrap;
        }
        .navbar-brand-xk:hover {
            color: var(--xk-primary);
        }
        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--xk-primary) 0%, var(--xk-deep) 100%);
            color: #fff;
            border-radius: 8px;
            font-size: 0.85rem;
        }
        .search-box-nav {
            flex: 1 1 260px;
            max-width: 420px;
            position: relative;
            min-width: 200px;
        }
        .search-box-nav input {
            width: 100%;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-search);
            padding: 0.5rem 2.4rem 0.5rem 1.1rem;
            font-size: 0.9rem;
            color: var(--xk-text);
            background-color: var(--xk-bg-soft);
            transition: border-color var(--xk-transition), box-shadow var(--xk-transition);
        }
        .search-box-nav input::placeholder {
            color: var(--xk-text-light);
        }
        .search-box-nav input:focus {
            outline: none;
            border-color: var(--xk-primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
            background-color: #fff;
        }
        .search-box-nav .search-icon {
            position: absolute;
            right: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--xk-text-light);
            font-size: 0.85rem;
            pointer-events: none;
        }
        .nav-toggle-xk {
            display: none;
            background: none;
            border: 1px solid var(--xk-border);
            border-radius: 8px;
            padding: 0.4rem 0.6rem;
            font-size: 1.1rem;
            color: var(--xk-text);
            cursor: pointer;
            transition: all var(--xk-transition);
        }
        .nav-toggle-xk:hover {
            border-color: var(--xk-primary);
            color: var(--xk-primary);
        }
        .nav-links-xk {
            display: flex;
            align-items: center;
            gap: 0.3rem;
            list-style: none;
            margin: 0;
            padding: 0;
            flex-wrap: wrap;
        }
        .nav-links-xk .nav-link-xk {
            display: block;
            padding: 0.4rem 0.7rem;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--xk-text-muted);
            border-radius: 6px;
            transition: all var(--xk-transition);
        }
        .nav-links-xk .nav-link-xk:hover {
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.06);
        }
        .nav-links-xk .nav-link-xk.active {
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.08);
            font-weight: 600;
        }

        /* Breadcrumb */
        .breadcrumb-xk {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            color: var(--xk-text-light);
            flex-wrap: wrap;
            margin-bottom: 0.75rem;
        }
        .breadcrumb-xk a {
            color: var(--xk-text-muted);
        }
        .breadcrumb-xk a:hover {
            color: var(--xk-primary);
        }
        .breadcrumb-xk .sep {
            color: var(--xk-text-light);
        }
        .breadcrumb-xk .current {
            color: var(--xk-text);
            font-weight: 500;
        }

        /* Category Hero */
        .cat-hero {
            background-color: var(--xk-bg-blue);
            padding: 3.5rem 0 2.5rem;
            border-bottom: 1px solid var(--xk-border);
        }
        .cat-hero h1 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--xk-deep);
            margin-bottom: 0.5rem;
        }
        .cat-hero .cat-desc {
            font-size: 1rem;
            color: var(--xk-text-muted);
            max-width: 760px;
            line-height: 1.8;
        }

        /* Content Card */
        .content-card-xk {
            background: #fff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            overflow: hidden;
            box-shadow: var(--xk-shadow-sm);
            transition: box-shadow var(--xk-transition-slow), transform var(--xk-transition-slow), border-color var(--xk-transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .content-card-xk:hover {
            box-shadow: var(--xk-shadow-hover);
            transform: translateY(-3px);
            border-color: var(--xk-border-hover);
        }
        .content-card-xk .card-img-wrap {
            position: relative;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background-color: var(--xk-bg-soft);
        }
        .content-card-xk .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--xk-transition-slow);
        }
        .content-card-xk:hover .card-img-wrap img {
            transform: scale(1.03);
        }
        .content-card-xk .card-img-wrap .card-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(255, 255, 255, 0.92);
            color: var(--xk-primary);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: var(--xk-radius-badge);
            border: 1px solid rgba(37, 99, 235, 0.2);
            backdrop-filter: blur(4px);
        }
        .content-card-xk .card-body-xk {
            padding: 1.25rem 1.25rem 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .content-card-xk .card-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.78rem;
            color: var(--xk-text-light);
            margin-bottom: 0.5rem;
        }
        .content-card-xk .card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--xk-deep);
            margin-bottom: 0.5rem;
            line-height: 1.45;
        }
        .content-card-xk .card-text {
            font-size: 0.9rem;
            color: var(--xk-text-muted);
            line-height: 1.7;
            margin-bottom: 1rem;
            flex: 1;
        }
        .content-card-xk .card-link {
            font-size: 0.88rem;
            font-weight: 600;
            color: var(--xk-primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .content-card-xk .card-link:hover {
            gap: 8px;
        }

        /* Hot Cards */
        .hot-card-xk {
            background: #fff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            padding: 1.2rem 1.4rem;
            box-shadow: var(--xk-shadow-sm);
            transition: all var(--xk-transition-slow);
            height: 100%;
        }
        .hot-card-xk:hover {
            box-shadow: var(--xk-shadow-hover);
            transform: translateY(-2px);
            border-color: var(--xk-border-hover);
        }
        .hot-card-xk .hot-index {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--xk-primary-light);
            opacity: 0.7;
            line-height: 1;
            margin-bottom: 0.5rem;
        }
        .hot-card-xk .hot-title {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--xk-deep);
            line-height: 1.5;
        }

        /* Data Strip */
        .data-strip-xk {
            display: flex;
            flex-wrap: wrap;
            gap: 0;
            background: #fff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            box-shadow: var(--xk-shadow-sm);
            overflow: hidden;
        }
        .data-strip-xk .data-item {
            flex: 1 1 160px;
            padding: 1.5rem 1.5rem;
            border-right: 1px solid var(--xk-border);
            text-align: center;
            transition: background var(--xk-transition);
        }
        .data-strip-xk .data-item:last-child {
            border-right: none;
        }
        .data-strip-xk .data-item:hover {
            background-color: var(--xk-bg-soft);
        }
        .data-strip-xk .data-num {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--xk-primary);
            line-height: 1.2;
        }
        .data-strip-xk .data-label {
            font-size: 0.82rem;
            color: var(--xk-text-muted);
            margin-top: 0.3rem;
        }

        /* FAQ */
        .faq-item-xk {
            background: #fff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            margin-bottom: 0.75rem;
            overflow: hidden;
            transition: border-color var(--xk-transition);
        }
        .faq-item-xk:hover {
            border-color: var(--xk-border-hover);
        }
        .faq-item-xk .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            background: none;
            border: none;
            padding: 1.1rem 1.5rem;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--xk-deep);
            cursor: pointer;
            text-align: left;
            gap: 12px;
            transition: color var(--xk-transition);
        }
        .faq-item-xk .faq-question:hover {
            color: var(--xk-primary);
        }
        .faq-item-xk .faq-question .faq-icon {
            color: var(--xk-text-light);
            font-size: 0.85rem;
            transition: transform var(--xk-transition);
            flex-shrink: 0;
        }
        .faq-item-xk .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 280ms ease, padding 280ms ease;
            padding: 0 1.5rem;
        }
        .faq-item-xk .faq-answer-inner {
            padding-bottom: 1.2rem;
            font-size: 0.9rem;
            color: var(--xk-text-muted);
            line-height: 1.75;
        }
        .faq-item-xk.active .faq-question .faq-icon {
            transform: rotate(180deg);
        }
        .faq-item-xk.active .faq-answer {
            max-height: 400px;
            padding-top: 0;
        }

        /* CTA Form */
        .cta-form-wrap {
            background: #fff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            padding: 2rem 2rem;
            box-shadow: var(--xk-shadow-md);
        }
        .cta-form-xk {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .cta-form-xk input[type="email"],
        .cta-form-xk input[type="text"] {
            flex: 1 1 240px;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-btn);
            padding: 0.65rem 1.1rem;
            font-size: 0.9rem;
            color: var(--xk-text);
            background-color: var(--xk-bg-soft);
            transition: border-color var(--xk-transition), box-shadow var(--xk-transition);
        }
        .cta-form-xk input:focus {
            outline: none;
            border-color: var(--xk-primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
            background-color: #fff;
        }

        /* Footer */
        .site-footer {
            background-color: var(--xk-deep);
            color: #c8d4e3;
            margin-top: auto;
            padding-top: 4rem;
            padding-bottom: 0;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 2.5rem;
            padding-bottom: 2.5rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.12);
        }
        .site-footer .footer-brand-name {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.75rem;
        }
        .site-footer .footer-brand-name .brand-icon {
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
        }
        .site-footer .footer-brand p {
            font-size: 0.85rem;
            color: #a8b8cc;
            line-height: 1.7;
            max-width: 320px;
        }
        .site-footer h5 {
            font-size: 0.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.9rem;
            letter-spacing: 0.02em;
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer ul li {
            margin-bottom: 0.5rem;
        }
        .site-footer ul li a {
            font-size: 0.85rem;
            color: #a8b8cc;
            transition: color var(--xk-transition);
        }
        .site-footer ul li a:hover {
            color: #fff;
        }
        .site-footer .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
            padding: 1.5rem 0;
            font-size: 0.8rem;
            color: #7e90a6;
        }
        .site-footer .footer-bottom .footer-icp {
            display: flex;
            align-items: center;
            gap: 1.2rem;
            flex-wrap: wrap;
        }
        .site-footer .footer-bottom a {
            color: #7e90a6;
            font-size: 0.8rem;
        }
        .site-footer .footer-bottom a:hover {
            color: #fff;
        }

        /* See More */
        .see-more-bar {
            display: flex;
            justify-content: center;
            margin-top: 2rem;
        }
        .see-more-bar .btn {
            min-width: 180px;
        }

        /* Responsive */
        @media (max-width: 1199.98px) {
            .container {
                max-width: 100%;
            }
        }
        @media (max-width: 991.98px) {
            .nav-wrap {
                gap: 0.8rem;
            }
            .search-box-nav {
                order: 3;
                flex-basis: 100%;
                max-width: 100%;
            }
            .nav-toggle-xk {
                display: block;
                margin-left: auto;
            }
            .nav-links-xk {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                gap: 0;
                padding: 0.75rem 0 0.25rem;
            }
            .nav-links-xk.open {
                display: flex;
            }
            .nav-links-xk .nav-item-xk {
                width: 100%;
            }
            .nav-links-xk .nav-link-xk {
                padding: 0.6rem 0.8rem;
                border-radius: 6px;
                width: 100%;
            }
            .cat-hero h1 {
                font-size: 2rem;
            }
            .data-strip-xk .data-item {
                flex-basis: 48%;
                border-right: 1px solid var(--xk-border);
                border-bottom: 1px solid var(--xk-border);
            }
            .data-strip-xk .data-item:nth-child(2n) {
                border-right: none;
            }
            .data-strip-xk .data-item:nth-last-child(-n+2) {
                border-bottom: none;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 767.98px) {
            .site-header {
                min-height: auto;
            }
            .cat-hero {
                padding: 2.2rem 0 1.8rem;
            }
            .cat-hero h1 {
                font-size: 1.7rem;
            }
            .cta-form-wrap {
                padding: 1.5rem 1.25rem;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        @media (max-width: 575.98px) {
            .data-strip-xk .data-item {
                flex-basis: 100%;
                border-right: none;
                border-bottom: 1px solid var(--xk-border);
            }
            .data-strip-xk .data-item:last-child {
                border-bottom: none;
            }
            .data-strip-xk .data-item:nth-child(2n) {
                border-right: none;
            }
            .data-strip-xk .data-item:nth-last-child(-n+2) {
                border-bottom: 1px solid var(--xk-border);
            }
            .data-strip-xk .data-item:last-child {
                border-bottom: none;
            }
            .cat-hero h1 {
                font-size: 1.5rem;
            }
            .cta-form-xk {
                flex-direction: column;
            }
            .cta-form-xk .btn {
                width: 100%;
            }
        }

/* roulang page: category3 */
:root {
    --xk-primary: #2563eb;
    --xk-primary-hover: #1d4ed8;
    --xk-primary-light: #3b82f6;
    --xk-deep: #0f1f3d;
    --xk-deep-mid: #142d4c;
    --xk-bg: #ffffff;
    --xk-bg-soft: #f7f9fb;
    --xk-bg-blue: #eaf1fb;
    --xk-text: #1a2b4a;
    --xk-text-muted: #5b6b84;
    --xk-text-light: #8a97ad;
    --xk-border: #e3e8ef;
    --xk-border-hover: #b8c9e0;
    --xk-radius-card: 12px;
    --xk-radius-btn: 8px;
    --xk-radius-search: 28px;
    --xk-radius-badge: 6px;
    --xk-shadow-sm: 0 2px 8px rgba(15,31,61,0.06);
    --xk-shadow-md: 0 4px 16px rgba(15,31,61,0.10);
    --xk-shadow-hover: 0 8px 24px rgba(15,31,61,0.14);
    --xk-font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
    --xk-transition: 200ms ease;
    --xk-transition-slow: 320ms cubic-bezier(0.4,0,0.2,1);
    --xk-section-padding: 56px;
    --xk-header-height: 76px;
}
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
body {
    font-family: var(--xk-font-sans);
    font-size: 16px;
    line-height: 1.75;
    color: var(--xk-text);
    background-color: var(--xk-bg);
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--xk-primary); text-decoration: none; transition: color var(--xk-transition); }
a:hover { color: var(--xk-primary-hover); }
a:focus-visible, button:focus-visible, input:focus-visible {
    outline: 3px solid rgba(37,99,235,0.35);
    outline-offset: 2px;
}
.container { max-width: 1170px; width: 100%; padding-left: 20px; padding-right: 20px; margin-left: auto; margin-right: auto; }
.section { padding: var(--xk-section-padding) 0; position: relative; }
.section-soft { background-color: var(--xk-bg-soft); }
.section-blue-tint { background-color: var(--xk-bg-blue); }
.section-deep { background-color: var(--xk-deep); }
.section-deep h2, .section-deep h3, .section-deep p { color: #e6edf7; }
.section-label {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 0.8rem; font-weight: 600; letter-spacing: 0.04em;
    color: var(--xk-primary);
    background-color: rgba(37,99,235,0.08);
    border: 1px solid rgba(37,99,235,0.18);
    padding: 4px 12px; border-radius: var(--xk-radius-badge);
    margin-bottom: 1rem;
}
.section-title-wrap { margin-bottom: 2.5rem; }
.section-title-wrap .section-desc {
    max-width: 720px; font-size: 1rem; color: var(--xk-text-muted);
    line-height: 1.8; margin-top: 0.75rem;
}
h1, h2, h3, h4, h5, h6 { font-weight: 700; color: var(--xk-text); line-height: 1.35; }
h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.1rem; }
p { color: var(--xk-text-muted); }
.btn {
    font-weight: 600; border-radius: var(--xk-radius-btn);
    padding: 0.65rem 1.5rem; font-size: 0.95rem;
    transition: all var(--xk-transition);
    border: 1px solid transparent;
    display: inline-flex; align-items: center; gap: 8px; justify-content: center;
}
.btn-primary { background-color: var(--xk-primary); border-color: var(--xk-primary); color: #ffffff; }
.btn-primary:hover, .btn-primary:focus {
    background-color: var(--xk-primary-hover); border-color: var(--xk-primary-hover);
    color: #ffffff; box-shadow: var(--xk-shadow-md);
}
.btn-primary:active { background-color: #1e40af; border-color: #1e40af; box-shadow: none; }
.btn-outline-primary { background-color: transparent; border-color: var(--xk-primary); color: var(--xk-primary); }
.btn-outline-primary:hover, .btn-outline-primary:focus {
    background-color: var(--xk-primary); border-color: var(--xk-primary);
    color: #ffffff; box-shadow: var(--xk-shadow-md);
}
.btn-outline-light { background-color: transparent; border-color: rgba(255,255,255,0.5); color: #ffffff; }
.btn-outline-light:hover, .btn-outline-light:focus {
    background-color: rgba(255,255,255,0.12); border-color: #ffffff; color: #ffffff;
}
.btn-sm { padding: 0.4rem 0.9rem; font-size: 0.85rem; }
.btn-lg { padding: 0.8rem 2rem; font-size: 1rem; }

/* Header / Nav */
.site-header {
    position: sticky; top: 0; z-index: 1050;
    background-color: #ffffff; border-bottom: 1px solid var(--xk-border);
    min-height: var(--xk-header-height);
    display: flex; align-items: center;
    transition: box-shadow var(--xk-transition);
}
.site-header.scrolled { box-shadow: var(--xk-shadow-sm); }
.nav-wrap { display: flex; align-items: center; gap: 1.25rem; width: 100%; min-height: var(--xk-header-height); }
.navbar-brand-xk {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 1.25rem; font-weight: 800; color: var(--xk-deep);
    letter-spacing: 0.02em; white-space: nowrap;
}
.navbar-brand-xk .brand-icon {
    width: 32px; height: 32px; border-radius: 8px;
    background: var(--xk-primary); color: #fff;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 0.95rem;
}
.navbar-brand-xk:hover { color: var(--xk-primary); }
.search-box-nav {
    flex: 1; max-width: 360px; position: relative; min-width: 180px;
}
.search-box-nav input {
    width: 100%; height: 42px;
    border: 1px solid var(--xk-border);
    border-radius: var(--xk-radius-search);
    padding: 0 44px 0 20px;
    font-size: 0.9rem; color: var(--xk-text);
    background-color: var(--xk-bg-soft);
    transition: all var(--xk-transition);
}
.search-box-nav input::placeholder { color: var(--xk-text-light); }
.search-box-nav input:focus {
    outline: none; border-color: var(--xk-primary);
    background-color: #fff; box-shadow: 0 0 0 4px rgba(37,99,235,0.12);
}
.search-box-nav .search-icon {
    position: absolute; right: 16px; top: 50%; transform: translateY(-50%);
    color: var(--xk-text-light); font-size: 0.9rem; pointer-events: none;
}
.nav-toggle-xk {
    display: none; background: none; border: none;
    font-size: 1.3rem; color: var(--xk-text); cursor: pointer;
    padding: 8px 12px; border-radius: 8px;
    transition: background var(--xk-transition);
}
.nav-toggle-xk:hover { background: var(--xk-bg-blue); }
.nav-links-xk {
    display: flex; align-items: center; gap: 0.25rem; margin: 0; padding: 0; list-style: none;
    flex-wrap: wrap;
}
.nav-item-xk a.nav-link-xk {
    display: block; padding: 8px 14px; font-size: 0.92rem; font-weight: 500;
    color: var(--xk-text-muted); border-radius: 8px;
    transition: all var(--xk-transition); white-space: nowrap;
}
.nav-item-xk a.nav-link-xk:hover { color: var(--xk-primary); background-color: var(--xk-bg-blue); }
.nav-item-xk a.nav-link-xk.active { color: var(--xk-primary); font-weight: 700; background-color: rgba(37,99,235,0.1); }

/* Breadcrumb */
.breadcrumb-xk {
    display: flex; align-items: center; list-style: none; margin: 0; padding: 0;
    font-size: 0.85rem; color: var(--xk-text-light); flex-wrap: wrap; gap: 6px;
}
.breadcrumb-xk li { display: inline-flex; align-items: center; gap: 6px; }
.breadcrumb-xk li a { color: var(--xk-text-muted); }
.breadcrumb-xk li a:hover { color: var(--xk-primary); }
.breadcrumb-xk li + li::before { content: "/"; color: var(--xk-text-light); margin-right: 6px; }

/* Page hero mini */
.page-hero-mini {
    background: var(--xk-bg-blue);
    padding: 2.5rem 0 2rem;
    border-bottom: 1px solid var(--xk-border);
}
.page-hero-mini .page-title-row { display: flex; align-items: flex-start; gap: 1.5rem; flex-wrap: wrap; }
.page-hero-mini .page-title-block { flex: 1; min-width: 250px; }
.page-hero-mini h1 { margin: 0 0 0.5rem; color: var(--xk-deep); font-size: 2rem; }
.page-hero-mini .page-subtitle {
    color: var(--xk-text-muted); font-size: 1rem; margin: 0; max-width: 720px;
    line-height: 1.8;
}
.page-hero-mini .page-actions {
    display: flex; align-items: center; gap: 0.75rem; flex-shrink: 0;
    margin-top: 0.25rem;
}

/* Cards */
.xk-card {
    background: #fff; border: 1px solid var(--xk-border);
    border-radius: var(--xk-radius-card);
    box-shadow: var(--xk-shadow-sm);
    overflow: hidden; height: 100%;
    transition: all var(--xk-transition);
    display: flex; flex-direction: column;
}
.xk-card:hover {
    box-shadow: var(--xk-shadow-hover);
    border-color: var(--xk-border-hover);
    transform: translateY(-3px);
}
.xk-card-img { position: relative; aspect-ratio: 16/9; overflow: hidden; background: var(--xk-bg-soft); }
.xk-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--xk-transition-slow); }
.xk-card:hover .xk-card-img img { transform: scale(1.04); }
.xk-card-img .img-badge {
    position: absolute; top: 12px; left: 12px;
    background: rgba(255,255,255,0.9); color: var(--xk-primary);
    font-size: 0.72rem; font-weight: 600; padding: 4px 10px;
    border-radius: 20px; letter-spacing: 0.03em;
}
.xk-card-body { padding: 1.25rem 1.25rem 1.4rem; flex: 1; display: flex; flex-direction: column; }
.xk-card-body .card-meta {
    display: flex; align-items: center; gap: 0.75rem;
    font-size: 0.75rem; color: var(--xk-text-light);
    margin-bottom: 0.65rem;
}
.xk-card-body h3 { font-size: 1.05rem; margin: 0 0 0.5rem; color: var(--xk-text); }
.xk-card-body h3 a { color: var(--xk-text); }
.xk-card-body h3 a:hover { color: var(--xk-primary); }
.xk-card-body .card-desc {
    font-size: 0.88rem; color: var(--xk-text-muted);
    margin: 0 0 1rem; line-height: 1.7; flex: 1;
}
.xk-card-body .card-link {
    font-size: 0.85rem; font-weight: 600; color: var(--xk-primary);
    display: inline-flex; align-items: center; gap: 6px;
}
.xk-card-body .card-link i { transition: transform var(--xk-transition); font-size: 0.75rem; }
.xk-card-body .card-link:hover i { transform: translateX(4px); }

/* Compact card */
.xk-card-compact {
    display: flex; gap: 0.9rem; background: #fff;
    border: 1px solid var(--xk-border); border-radius: var(--xk-radius-card);
    box-shadow: var(--xk-shadow-sm); padding: 1rem; height: 100%;
    transition: all var(--xk-transition); align-items: flex-start;
}
.xk-card-compact:hover {
    box-shadow: var(--xk-shadow-hover); border-color: var(--xk-border-hover);
    transform: translateY(-2px);
}
.xk-card-compact .compact-icon {
    width: 38px; height: 38px; border-radius: 10px;
    background: var(--xk-bg-blue); color: var(--xk-primary);
    display: inline-flex; align-items: center; justify-content: center;
    flex-shrink: 0; font-size: 0.95rem;
}
.xk-card-compact .compact-content h4 { font-size: 0.95rem; margin: 0 0 0.35rem; }
.xk-card-compact .compact-content p {
    font-size: 0.82rem; color: var(--xk-text-muted); margin: 0;
    line-height: 1.65;
}

/* Stat strip */
.stat-strip {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem;
}
.stat-item {
    text-align: center; padding: 1.25rem 1rem;
    background: #fff; border: 1px solid var(--xk-border);
    border-radius: var(--xk-radius-card); box-shadow: var(--xk-shadow-sm);
}
.stat-item .stat-num {
    font-size: 1.9rem; font-weight: 800; color: var(--xk-primary);
    line-height: 1.2; letter-spacing: -0.02em;
}
.stat-item .stat-label {
    font-size: 0.85rem; color: var(--xk-text-muted); margin-top: 0.3rem;
}

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 0.8rem; }
.faq-item {
    background: #fff; border: 1px solid var(--xk-border);
    border-radius: var(--xk-radius-card); box-shadow: var(--xk-shadow-sm);
    overflow: hidden; transition: all var(--xk-transition);
}
.faq-item:hover { border-color: var(--xk-border-hover); }
.faq-question {
    width: 100%; background: none; border: none; text-align: left;
    padding: 1.1rem 1.25rem; font-size: 1rem; font-weight: 600;
    color: var(--xk-text); cursor: pointer;
    display: flex; align-items: center; justify-content: space-between; gap: 1rem;
    transition: all var(--xk-transition);
}
.faq-question:hover { color: var(--xk-primary); }
.faq-question i { color: var(--xk-primary); font-size: 0.9rem; transition: transform var(--xk-transition); flex-shrink: 0; }
.faq-item.open .faq-question i { transform: rotate(180deg); }
.faq-answer {
    max-height: 0; overflow: hidden; transition: max-height var(--xk-transition-slow);
    padding: 0 1.25rem;
}
.faq-item.open .faq-answer { max-height: 300px; padding-bottom: 1.25rem; }
.faq-answer p {
    font-size: 0.9rem; color: var(--xk-text-muted); margin: 0;
    line-height: 1.75; background: var(--xk-bg-soft);
    padding: 1rem 1.1rem; border-radius: 8px;
}

/* CTA/Subscribe */
.subscribe-box {
    background: var(--xk-bg-blue); border: 1px solid var(--xk-border);
    border-radius: var(--xk-radius-card); padding: 2rem;
}
.subscribe-box .subscribe-form {
    display: flex; gap: 0.75rem; margin-top: 1.25rem; max-width: 560px;
}
.subscribe-box .subscribe-form input {
    flex: 1; height: 46px; border: 1px solid var(--xk-border);
    border-radius: 8px; padding: 0 1rem; font-size: 0.9rem;
    color: var(--xk-text); background: #fff;
    transition: all var(--xk-transition);
}
.subscribe-box .subscribe-form input:focus {
    outline: none; border-color: var(--xk-primary);
    box-shadow: 0 0 0 4px rgba(37,99,235,0.1);
}

/* More link */
.more-link-wrap { text-align: center; margin-top: 0.5rem; }
.more-link {
    display: inline-flex; align-items: center; gap: 8px;
    font-weight: 600; font-size: 0.95rem; color: var(--xk-primary);
    border: 1px solid var(--xk-border); padding: 0.6rem 1.6rem;
    border-radius: 50px; background: #fff;
    transition: all var(--xk-transition);
}
.more-link:hover { background: var(--xk-primary); color: #fff; border-color: var(--xk-primary); box-shadow: var(--xk-shadow-md); }
.more-link i { transition: transform var(--xk-transition); }
.more-link:hover i { transform: translateX(4px); }

/* Footer */
.site-footer {
    background-color: var(--xk-deep); color: #e6edf7;
    padding: 3rem 0 1.5rem; margin-top: auto;
}
.site-footer a { color: #c7d6ea; }
.site-footer a:hover { color: #ffffff; }
.site-footer .footer-grid {
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem;
    padding-bottom: 2rem; border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-brand-name {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 1.25rem; font-weight: 800; color: #fff; margin-bottom: 0.85rem;
}
.footer-brand-name .brand-icon {
    width: 30px; height: 30px; border-radius: 8px;
    background: var(--xk-primary); color: #fff;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 0.85rem;
}
.footer-brand p {
    font-size: 0.85rem; color: #aebdd0; margin: 0; line-height: 1.75;
}
.footer-col h5 {
    font-size: 0.9rem; font-weight: 700; color: #fff; margin-bottom: 0.85rem;
    letter-spacing: 0.05em;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col ul li { margin-bottom: 0.45rem; }
.footer-col ul li a { font-size: 0.85rem; }
.footer-bottom {
    display: flex; align-items: center; justify-content: space-between;
    flex-wrap: wrap; gap: 0.5rem; padding-top: 1.25rem;
    font-size: 0.8rem; color: #8da1b8;
}
.footer-bottom a { font-size: 0.8rem; color: #8da1b8; }
.footer-bottom a:hover { color: #fff; }
.footer-icp { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }

/* Responsive */
@media (max-width: 991.98px) {
    .nav-wrap { flex-wrap: wrap; gap: 0.75rem; padding: 0.5rem 0; }
    .search-box-nav { order: 3; flex: 1 1 100%; max-width: 100%; }
    .nav-links-xk { order: 2; flex: 1 1 auto; justify-content: flex-end; }
    .navbar-brand-xk { order: 1; flex-shrink: 0; }
    .stat-strip { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
    h1 { font-size: 1.9rem; }
}
@media (max-width: 767.98px) {
    :root { --xk-section-padding: 44px; }
    .nav-wrap { flex-wrap: nowrap; }
    .nav-toggle-xk { display: inline-flex; order: 3; }
    .nav-links-xk {
        display: none; position: absolute; top: var(--xk-header-height);
        left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--xk-border);
        flex-direction: column; align-items: stretch; gap: 0; padding: 0.75rem 1.25rem;
        box-shadow: var(--xk-shadow-md); z-index: 1040;
    }
    .nav-links-xk.open { display: flex; }
    .nav-item-xk a.nav-link-xk { padding: 12px 16px; font-size: 1rem; }
    .search-box-nav { order: 2; flex: 1 1 auto; max-width: none; min-width: 0; }
    .navbar-brand-xk { order: 1; flex-shrink: 0; }
    .nav-toggle-xk { order: 3; flex-shrink: 0; }
    .search-box-nav input { height: 38px; font-size: 0.82rem; padding-right: 36px; }
    .page-hero-mini { padding: 1.75rem 0 1.5rem; }
    .page-hero-mini h1 { font-size: 1.6rem; }
    .page-hero-mini .page-actions { width: 100%; margin-top: 0.5rem; }
    .stat-strip { grid-template-columns: 1fr 1fr; gap: 0.8rem; }
    .stat-item .stat-num { font-size: 1.5rem; }
    .subscribe-box { padding: 1.5rem; }
    .subscribe-box .subscribe-form { flex-direction: column; }
    .footer-grid { grid-template-columns: 1fr; gap: 1.25rem; }
    .footer-bottom { flex-direction: column; align-items: flex-start; gap: 0.35rem; }
    .footer-icp { flex-direction: column; align-items: flex-start; gap: 0.25rem; }
}
@media (max-width: 519.98px) {
    .stat-strip { grid-template-columns: 1fr; }
    h2 { font-size: 1.4rem; }
    h3 { font-size: 1.15rem; }
    .xk-card-body { padding: 1rem 1rem 1.2rem; }
    .section-title-wrap { margin-bottom: 1.5rem; }
}

/* roulang page: category1 */
:root {
      --xk-primary: #2563eb;
      --xk-primary-hover: #1d4ed8;
      --xk-primary-light: #3b82f6;
      --xk-deep: #0f1f3d;
      --xk-deep-mid: #142d4c;
      --xk-bg: #ffffff;
      --xk-bg-soft: #f7f9fb;
      --xk-bg-blue: #eaf1fb;
      --xk-text: #1a2b4a;
      --xk-text-muted: #5b6b84;
      --xk-text-light: #8a97ad;
      --xk-border: #e3e8ef;
      --xk-border-hover: #b8c9e0;
      --xk-radius-card: 12px;
      --xk-radius-btn: 8px;
      --xk-radius-search: 28px;
      --xk-radius-badge: 6px;
      --xk-shadow-sm: 0 2px 8px rgba(15, 31, 61, 0.06);
      --xk-shadow-md: 0 4px 16px rgba(15, 31, 61, 0.10);
      --xk-shadow-hover: 0 8px 24px rgba(15, 31, 61, 0.14);
      --xk-font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
      --xk-transition: 200ms ease;
      --xk-transition-slow: 320ms cubic-bezier(0.4, 0, 0.2, 1);
      --xk-section-padding: 56px;
      --xk-header-height: 76px;
    }

    html {
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    body {
      font-family: var(--xk-font-sans);
      font-size: 16px;
      line-height: 1.75;
      color: var(--xk-text);
      background-color: var(--xk-bg);
      overflow-x: hidden;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      color: var(--xk-primary);
      text-decoration: none;
      transition: color var(--xk-transition);
    }

    a:hover {
      color: var(--xk-primary-hover);
    }

    a:focus-visible,
    button:focus-visible,
    input:focus-visible {
      outline: 3px solid rgba(37, 99, 235, 0.35);
      outline-offset: 2px;
    }

    .container {
      max-width: 1170px;
      width: 100%;
      padding-left: 20px;
      padding-right: 20px;
      margin-left: auto;
      margin-right: auto;
    }

    .section {
      padding: var(--xk-section-padding) 0;
      position: relative;
    }

    .section-soft {
      background-color: var(--xk-bg-soft);
    }

    .section-blue-tint {
      background-color: var(--xk-bg-blue);
    }

    .section-deep {
      background-color: var(--xk-deep);
    }

    .section-deep h2,
    .section-deep h3,
    .section-deep p {
      color: #e6edf7;
    }

    .section-label {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.8rem;
      font-weight: 600;
      letter-spacing: 0.04em;
      color: var(--xk-primary);
      background-color: rgba(37, 99, 235, 0.08);
      border: 1px solid rgba(37, 99, 235, 0.18);
      padding: 4px 12px;
      border-radius: var(--xk-radius-badge);
      margin-bottom: 1rem;
    }

    .section-title-wrap {
      margin-bottom: 2rem;
    }

    .section-title-wrap .section-desc {
      max-width: 720px;
      font-size: 1rem;
      color: var(--xk-text-muted);
      line-height: 1.8;
      margin-top: 0.5rem;
    }

    .btn {
      font-weight: 600;
      border-radius: var(--xk-radius-btn);
      padding: 0.65rem 1.5rem;
      font-size: 0.95rem;
      transition: all var(--xk-transition);
      border: 1px solid transparent;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      justify-content: center;
    }

    .btn-primary {
      background-color: var(--xk-primary);
      border-color: var(--xk-primary);
      color: #ffffff;
    }

    .btn-primary:hover,
    .btn-primary:focus {
      background-color: var(--xk-primary-hover);
      border-color: var(--xk-primary-hover);
      color: #ffffff;
      box-shadow: var(--xk-shadow-md);
    }

    .btn-primary:active {
      background-color: #1e40af;
      border-color: #1e40af;
      box-shadow: none;
    }

    .btn-outline-primary {
      background-color: transparent;
      border-color: var(--xk-primary);
      color: var(--xk-primary);
    }

    .btn-outline-primary:hover,
    .btn-outline-primary:focus {
      background-color: var(--xk-primary);
      border-color: var(--xk-primary);
      color: #ffffff;
      box-shadow: var(--xk-shadow-md);
    }

    .btn-outline-light {
      background-color: transparent;
      border-color: rgba(255, 255, 255, 0.5);
      color: #ffffff;
    }

    .btn-outline-light:hover,
    .btn-outline-light:focus {
      background-color: rgba(255, 255, 255, 0.12);
      border-color: #ffffff;
      color: #ffffff;
    }

    .btn-sm {
      padding: 0.4rem 0.9rem;
      font-size: 0.85rem;
    }

    .btn-lg {
      padding: 0.8rem 2rem;
      font-size: 1rem;
    }

    /* Header / Nav */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1050;
      background-color: #ffffff;
      border-bottom: 1px solid var(--xk-border);
      min-height: var(--xk-header-height);
      display: flex;
      align-items: center;
      transition: box-shadow var(--xk-transition);
    }

    .site-header.scrolled {
      box-shadow: var(--xk-shadow-sm);
    }

    .nav-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1.5rem;
      width: 100%;
    }

    .navbar-brand-xk {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.3rem;
      color: var(--xk-deep);
      white-space: nowrap;
    }

    .navbar-brand-xk:hover {
      color: var(--xk-primary);
    }

    .brand-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      border-radius: 8px;
      background: linear-gradient(135deg, var(--xk-primary), var(--xk-deep-mid));
      color: #fff;
      font-size: 0.9rem;
    }

    .search-box-nav {
      position: relative;
      flex: 1 1 220px;
      max-width: 360px;
      min-width: 140px;
    }

    .search-box-nav input {
      width: 100%;
      border: 1px solid var(--xk-border);
      border-radius: var(--xk-radius-search);
      padding: 0.55rem 2.2rem 0.55rem 1.1rem;
      font-size: 0.9rem;
      background-color: var(--xk-bg-soft);
      color: var(--xk-text);
      transition: all var(--xk-transition);
    }

    .search-box-nav input:focus {
      outline: none;
      border-color: var(--xk-primary);
      background-color: #fff;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    }

    .search-icon {
      position: absolute;
      right: 1rem;
      top: 50%;
      transform: translateY(-50%);
      color: var(--xk-text-light);
      font-size: 0.9rem;
      pointer-events: none;
    }

    .nav-toggle-xk {
      display: none;
      background: none;
      border: 1px solid var(--xk-border);
      border-radius: 8px;
      color: var(--xk-deep);
      font-size: 1.2rem;
      padding: 0.4rem 0.65rem;
      transition: all var(--xk-transition);
    }

    .nav-toggle-xk:hover {
      background-color: var(--xk-bg-soft);
    }

    .nav-links-xk {
      display: flex;
      align-items: center;
      gap: 0.3rem;
      list-style: none;
      margin: 0;
      padding: 0;
      flex-wrap: nowrap;
    }

    .nav-item-xk {
      position: relative;
    }

    .nav-link-xk {
      display: inline-block;
      padding: 0.5rem 0.85rem;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--xk-text-muted);
      border-radius: 6px;
      white-space: nowrap;
      transition: all var(--xk-transition);
    }

    .nav-link-xk:hover {
      color: var(--xk-primary);
      background-color: rgba(37, 99, 235, 0.06);
    }

    .nav-link-xk.active {
      color: var(--xk-primary);
      background-color: rgba(37, 99, 235, 0.09);
      font-weight: 600;
    }

    /* Page Hero (Category) */
    .page-hero {
      padding: 2.5rem 0 2rem;
      background-color: var(--xk-bg-soft);
      border-bottom: 1px solid var(--xk-border);
    }

    .breadcrumb {
      margin-bottom: 1.25rem;
      font-size: 0.85rem;
    }

    .breadcrumb-item a {
      color: var(--xk-text-muted);
    }

    .breadcrumb-item a:hover {
      color: var(--xk-primary);
    }

    .breadcrumb-item.active {
      color: var(--xk-text-light);
    }

    .page-hero-content h1 {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--xk-deep);
      margin-bottom: 0.5rem;
      line-height: 1.3;
    }

    .page-hero-content .hero-desc {
      font-size: 1rem;
      color: var(--xk-text-muted);
      max-width: 780px;
      line-height: 1.8;
      margin-bottom: 0;
    }

    .page-hero-meta {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      flex-wrap: wrap;
      margin-top: 0.75rem;
    }

    .hero-stat-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.8rem;
      color: var(--xk-primary);
      background-color: #fff;
      border: 1px solid rgba(37, 99, 235, 0.2);
      padding: 4px 12px;
      border-radius: 20px;
    }

    /* Data list cards */
    .list-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 1.5rem;
    }

    .data-card {
      background: #fff;
      border: 1px solid var(--xk-border);
      border-radius: var(--xk-radius-card);
      overflow: hidden;
      box-shadow: var(--xk-shadow-sm);
      transition: all var(--xk-transition);
      display: flex;
      flex-direction: column;
    }

    .data-card:hover {
      box-shadow: var(--xk-shadow-hover);
      border-color: var(--xk-border-hover);
      transform: translateY(-3px);
    }

    .data-card-img {
      aspect-ratio: 16 / 8;
      overflow: hidden;
      background-color: var(--xk-bg-blue);
    }

    .data-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform var(--xk-transition-slow);
    }

    .data-card:hover .data-card-img img {
      transform: scale(1.03);
    }

    .data-card-body {
      padding: 1.2rem 1.3rem 1.3rem;
      display: flex;
      flex-direction: column;
      flex: 1;
    }

    .data-card-tag {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--xk-primary);
      background-color: rgba(37, 99, 235, 0.08);
      border-radius: var(--xk-radius-badge);
      padding: 3px 10px;
      margin-bottom: 0.6rem;
      align-self: flex-start;
    }

    .data-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--xk-text);
      margin-bottom: 0.5rem;
      line-height: 1.5;
    }

    .data-card p {
      font-size: 0.9rem;
      color: var(--xk-text-muted);
      line-height: 1.7;
      margin-bottom: 0.9rem;
      flex: 1;
    }

    .data-card-footer {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 0.75rem;
      font-size: 0.8rem;
      color: var(--xk-text-light);
    }

    .data-card-footer .date {
      display: inline-flex;
      align-items: center;
      gap: 5px;
    }

    .data-card-footer a {
      font-weight: 600;
      font-size: 0.85rem;
    }

    /* Recommend grid */
    .recommend-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.25rem;
    }

    .recommend-card {
      background: #fff;
      border: 1px solid var(--xk-border);
      border-radius: var(--xk-radius-card);
      box-shadow: var(--xk-shadow-sm);
      transition: all var(--xk-transition);
      display: block;
      padding: 1.1rem 1.2rem;
    }

    .recommend-card:hover {
      border-color: var(--xk-border-hover);
      box-shadow: var(--xk-shadow-hover);
      transform: translateY(-2px);
    }

    .recommend-card .rec-tag {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--xk-primary);
      margin-bottom: 0.4rem;
      display: block;
    }

    .recommend-card h3 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--xk-text);
      margin-bottom: 0.4rem;
      line-height: 1.5;
    }

    .recommend-card p {
      font-size: 0.85rem;
      color: var(--xk-text-muted);
      line-height: 1.6;
      margin-bottom: 0.4rem;
    }

    .recommend-card .rec-date {
      font-size: 0.75rem;
      color: var(--xk-text-light);
    }

    /* Scenario grid */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.25rem;
    }

    .scenario-card {
      background: #fff;
      border: 1px solid var(--xk-border);
      border-radius: var(--xk-radius-card);
      overflow: hidden;
      box-shadow: var(--xk-shadow-sm);
      transition: all var(--xk-transition);
    }

    .scenario-card:hover {
      border-color: var(--xk-border-hover);
      box-shadow: var(--xk-shadow-hover);
      transform: translateY(-3px);
    }

    .scenario-img {
      aspect-ratio: 16 / 8;
      overflow: hidden;
      background-color: var(--xk-bg-blue);
    }

    .scenario-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .scenario-body {
      padding: 1rem 1.2rem 1.2rem;
    }

    .scenario-body h3 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--xk-text);
      margin-bottom: 0.4rem;
    }

    .scenario-body p {
      font-size: 0.85rem;
      color: var(--xk-text-muted);
      line-height: 1.6;
      margin-bottom: 0;
    }

    /* Metrics */
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.25rem;
    }

    .metric-item {
      background: #fff;
      border: 1px solid var(--xk-border);
      border-radius: var(--xk-radius-card);
      padding: 1.3rem 1.2rem;
      text-align: center;
      box-shadow: var(--xk-shadow-sm);
    }

    .metric-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--xk-primary);
      line-height: 1.2;
      margin-bottom: 0.3rem;
    }

    .metric-label {
      font-size: 0.85rem;
      color: var(--xk-text-muted);
    }

    /* FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #fff;
      border: 1px solid var(--xk-border);
      border-radius: var(--xk-radius-card);
      box-shadow: var(--xk-shadow-sm);
      margin-bottom: 0.9rem;
      overflow: hidden;
      transition: all var(--xk-transition);
    }

    .faq-item:hover {
      border-color: var(--xk-border-hover);
    }

    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      padding: 1.1rem 1.3rem;
      background: #fff;
      border: none;
      color: var(--xk-text);
      font-weight: 600;
      font-size: 1rem;
      line-height: 1.5;
      cursor: pointer;
      text-align: left;
      transition: background var(--xk-transition);
    }

    .faq-question:hover {
      background-color: var(--xk-bg-soft);
    }

    .faq-icon {
      flex-shrink: 0;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background-color: rgba(37, 99, 235, 0.1);
      color: var(--xk-primary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.8rem;
      transition: transform var(--xk-transition);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height var(--xk-transition-slow), padding var(--xk-transition-slow);
      background-color: var(--xk-bg-soft);
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
    }

    .faq-answer-inner {
      padding: 0 1.3rem 1.1rem;
      font-size: 0.9rem;
      color: var(--xk-text-muted);
      line-height: 1.8;
    }

    /* Subscribe CTA */
    .subscribe-box {
      max-width: 780px;
      margin: 0 auto;
      background: #fff;
      border: 1px solid var(--xk-border);
      border-radius: var(--xk-radius-card);
      box-shadow: var(--xk-shadow-md);
      padding: 2rem 2.2rem;
      text-align: center;
    }

    .subscribe-box h2 {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--xk-deep);
      margin-bottom: 0.5rem;
    }

    .subscribe-box p {
      font-size: 0.95rem;
      color: var(--xk-text-muted);
      margin-bottom: 1.5rem;
    }

    .subscribe-form {
      display: flex;
      gap: 0.75rem;
      max-width: 520px;
      margin: 0 auto;
    }

    .subscribe-form input {
      flex: 1;
      border: 1px solid var(--xk-border);
      border-radius: var(--xk-radius-btn);
      padding: 0.65rem 1rem;
      font-size: 0.95rem;
      transition: all var(--xk-transition);
    }

    .subscribe-form input:focus {
      outline: none;
      border-color: var(--xk-primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    }

    /* Footer */
    .site-footer {
      background-color: var(--xk-deep);
      color: #e6edf7;
      padding: 3rem 0 1.2rem;
      margin-top: 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      padding-bottom: 2rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    }

    .footer-brand-name {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.25rem;
      color: #fff;
      margin-bottom: 0.75rem;
    }

    .footer-brand p {
      font-size: 0.9rem;
      color: rgba(230, 237, 247, 0.75);
      line-height: 1.7;
      max-width: 300px;
      margin-bottom: 0;
    }

    .footer-col h5 {
      font-size: 0.95rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 0.9rem;
    }

    .footer-col ul {
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .footer-col li {
      margin-bottom: 0.4rem;
    }

    .footer-col a {
      color: rgba(230, 237, 247, 0.7);
      font-size: 0.85rem;
      transition: color var(--xk-transition);
    }

    .footer-col a:hover {
      color: #fff;
    }

    .footer-bottom {
      padding-top: 1rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      flex-wrap: wrap;
      font-size: 0.8rem;
      color: rgba(230, 237, 247, 0.6);
    }

    .footer-icp {
      display: flex;
      align-items: center;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .footer-bottom a {
      color: rgba(230, 237, 247, 0.7);
      font-size: 0.8rem;
    }

    .footer-bottom a:hover {
      color: #fff;
    }

    /* Responsive */
    @media (max-width: 991px) {
      .nav-links-xk {
        gap: 0.1rem;
      }
      .nav-link-xk {
        padding: 0.45rem 0.6rem;
        font-size: 0.83rem;
      }
      .search-box-nav {
        max-width: 260px;
      }
      .list-grid {
        grid-template-columns: 1fr;
      }
      .recommend-grid,
      .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metric-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      :root {
        --xk-section-padding: 44px;
      }
      .nav-toggle-xk {
        display: inline-flex;
      }
      .nav-links-xk {
        position: absolute;
        top: calc(var(--xk-header-height) - 10px);
        left: 0;
        right: 0;
        background: #fff;
        border-bottom: 1px solid var(--xk-border);
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: 0.75rem 1.25rem 1rem;
        box-shadow: var(--xk-shadow-md);
        display: none;
      }
      .nav-links-xk.open {
        display: flex;
      }
      .nav-item-xk {
        width: 100%;
      }
      .nav-link-xk {
        display: block;
        width: 100%;
        padding: 0.65rem 0.75rem;
        font-size: 0.95rem;
      }
      .search-box-nav {
        order: 2;
        flex: 1 1 auto;
        max-width: none;
      }
      .nav-wrap {
        flex-wrap: wrap;
        gap: 0.75rem;
      }
      .page-hero-content h1 {
        font-size: 2rem;
      }
      .list-grid {
        grid-template-columns: 1fr;
      }
      .recommend-grid,
      .scenario-grid {
        grid-template-columns: 1fr;
      }
      .metric-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.8rem;
      }
      .subscribe-form {
        flex-direction: column;
      }
      .subscribe-box {
        padding: 1.5rem 1rem;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    @media (max-width: 520px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
      .page-hero-content h1 {
        font-size: 1.7rem;
      }
      .data-card-body {
        padding: 1rem;
      }
      .metric-grid {
        grid-template-columns: 1fr 1fr;
      }
      .metric-number {
        font-size: 1.5rem;
      }
      .search-box-nav {
        width: 100%;
      }
      .nav-wrap .navbar-brand-xk {
        font-size: 1.1rem;
      }
    }

/* roulang page: category5 */
:root {
            --xk-primary: #2563eb;
            --xk-primary-hover: #1d4ed8;
            --xk-primary-light: #3b82f6;
            --xk-deep: #0f1f3d;
            --xk-deep-mid: #142d4c;
            --xk-bg: #ffffff;
            --xk-bg-soft: #f7f9fb;
            --xk-bg-blue: #eaf1fb;
            --xk-text: #1a2b4a;
            --xk-text-muted: #5b6b84;
            --xk-text-light: #8a97ad;
            --xk-border: #e3e8ef;
            --xk-border-hover: #b8c9e0;
            --xk-radius-card: 12px;
            --xk-radius-btn: 8px;
            --xk-radius-search: 28px;
            --xk-radius-badge: 6px;
            --xk-shadow-sm: 0 2px 8px rgba(15, 31, 61, 0.06);
            --xk-shadow-md: 0 4px 16px rgba(15, 31, 61, 0.10);
            --xk-shadow-hover: 0 8px 24px rgba(15, 31, 61, 0.14);
            --xk-font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
            --xk-transition: 200ms ease;
            --xk-transition-slow: 320ms cubic-bezier(0.4, 0, 0.2, 1);
            --xk-section-padding: 88px;
            --xk-header-height: 76px;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--xk-font-sans);
            font-size: 16px;
            line-height: 1.75;
            color: var(--xk-text);
            background-color: var(--xk-bg);
            overflow-x: hidden;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--xk-primary);
            text-decoration: none;
            transition: color var(--xk-transition);
        }

        a:hover {
            color: var(--xk-primary-hover);
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.35);
            outline-offset: 2px;
        }

        .container {
            max-width: 1170px;
            width: 100%;
            padding-left: 20px;
            padding-right: 20px;
            margin-left: auto;
            margin-right: auto;
        }

        .section {
            padding: var(--xk-section-padding) 0;
            position: relative;
        }

        .section-soft {
            background-color: var(--xk-bg-soft);
        }

        .section-blue-tint {
            background-color: var(--xk-bg-blue);
        }

        .section-deep {
            background-color: var(--xk-deep);
        }

        .section-deep h2,
        .section-deep h3,
        .section-deep p {
            color: #e6edf7;
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.08);
            border: 1px solid rgba(37, 99, 235, 0.18);
            padding: 4px 12px;
            border-radius: var(--xk-radius-badge);
            margin-bottom: 1rem;
        }

        .section-title-wrap {
            margin-bottom: 2.5rem;
        }

        .section-title-wrap .section-desc {
            max-width: 720px;
            font-size: 1rem;
            color: var(--xk-text-muted);
            line-height: 1.8;
            margin-top: 0.75rem;
        }

        .btn {
            font-weight: 600;
            border-radius: var(--xk-radius-btn);
            padding: 0.65rem 1.5rem;
            font-size: 0.95rem;
            transition: all var(--xk-transition);
            border: 1px solid transparent;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            justify-content: center;
        }

        .btn-primary {
            background-color: var(--xk-primary);
            border-color: var(--xk-primary);
            color: #ffffff;
        }

        .btn-primary:hover,
        .btn-primary:focus {
            background-color: var(--xk-primary-hover);
            border-color: var(--xk-primary-hover);
            color: #ffffff;
            box-shadow: var(--xk-shadow-md);
        }

        .btn-primary:active {
            background-color: #1e40af;
            border-color: #1e40af;
            box-shadow: none;
        }

        .btn-outline-primary {
            background-color: transparent;
            border-color: var(--xk-primary);
            color: var(--xk-primary);
        }

        .btn-outline-primary:hover,
        .btn-outline-primary:focus {
            background-color: var(--xk-primary);
            border-color: var(--xk-primary);
            color: #ffffff;
            box-shadow: var(--xk-shadow-md);
        }

        .btn-outline-light {
            background-color: transparent;
            border-color: rgba(255, 255, 255, 0.5);
            color: #ffffff;
        }

        .btn-outline-light:hover,
        .btn-outline-light:focus {
            background-color: rgba(255, 255, 255, 0.12);
            border-color: #ffffff;
            color: #ffffff;
        }

        .btn-sm {
            padding: 0.4rem 0.9rem;
            font-size: 0.85rem;
        }

        .btn-lg {
            padding: 0.8rem 2rem;
            font-size: 1rem;
        }

        /* Header / Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background-color: #ffffff;
            border-bottom: 1px solid var(--xk-border);
            min-height: var(--xk-header-height);
            display: flex;
            align-items: center;
            transition: box-shadow var(--xk-transition);
        }

        .site-header.scrolled {
            box-shadow: var(--xk-shadow-sm);
        }

        .nav-wrap {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            flex-wrap: nowrap;
            min-height: var(--xk-header-height);
            padding: 0.5rem 0;
        }

        .navbar-brand-xk {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 700;
            font-size: 1.15rem;
            color: var(--xk-deep);
            white-space: nowrap;
            flex-shrink: 0;
        }

        .navbar-brand-xk:hover {
            color: var(--xk-primary);
        }

        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            background-color: var(--xk-primary);
            color: #fff;
            border-radius: 8px;
            font-size: 0.85rem;
        }

        .search-box-nav {
            position: relative;
            flex: 1 1 240px;
            max-width: 360px;
            margin-left: 0.5rem;
            margin-right: 0.5rem;
        }

        .search-box-nav input[type="search"] {
            width: 100%;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-search);
            padding: 0.55rem 2.5rem 0.55rem 1rem;
            font-size: 0.9rem;
            background-color: var(--xk-bg-soft);
            transition: all var(--xk-transition);
            color: var(--xk-text);
        }

        .search-box-nav input[type="search"]::placeholder {
            color: var(--xk-text-light);
        }

        .search-box-nav input[type="search"]:focus {
            border-color: var(--xk-primary);
            background-color: #fff;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
            outline: none;
        }

        .search-icon {
            position: absolute;
            right: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--xk-text-light);
            font-size: 0.85rem;
            pointer-events: none;
        }

        .nav-toggle-xk {
            display: none;
            background: none;
            border: 1px solid var(--xk-border);
            border-radius: 8px;
            padding: 0.4rem 0.7rem;
            font-size: 1.1rem;
            color: var(--xk-deep);
            cursor: pointer;
            transition: all var(--xk-transition);
            flex-shrink: 0;
        }

        .nav-toggle-xk:hover {
            background-color: var(--xk-bg-soft);
            border-color: var(--xk-border-hover);
        }

        .nav-links-xk {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            list-style: none;
            margin: 0;
            padding: 0;
            flex-shrink: 0;
        }

        .nav-item-xk {
            margin: 0;
        }

        .nav-link-xk {
            display: inline-block;
            padding: 0.45rem 0.8rem;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--xk-text-muted);
            border-radius: 6px;
            transition: all var(--xk-transition);
            white-space: nowrap;
        }

        .nav-link-xk:hover {
            color: var(--xk-primary);
            background-color: var(--xk-bg-soft);
        }

        .nav-link-xk.active {
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.08);
            font-weight: 600;
        }

        /* Breadcrumb */
        .breadcrumb-xk {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.4rem;
            list-style: none;
            padding: 0;
            margin: 0 0 1rem 0;
            font-size: 0.85rem;
            color: var(--xk-text-light);
        }

        .breadcrumb-xk li {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }

        .breadcrumb-xk li+li::before {
            content: "/";
            color: var(--xk-text-light);
            margin-right: 0.4rem;
        }

        .breadcrumb-xk a {
            color: var(--xk-text-muted);
        }

        .breadcrumb-xk a:hover {
            color: var(--xk-primary);
        }

        /* Category Hero */
        .category-hero {
            background-color: var(--xk-bg-blue);
            border-bottom: 1px solid var(--xk-border);
            padding: 3rem 0 2.5rem;
        }

        .category-hero h1 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--xk-deep);
            margin-bottom: 0.75rem;
            line-height: 1.3;
        }

        .category-hero .hero-sub {
            font-size: 1.05rem;
            color: var(--xk-text-muted);
            max-width: 780px;
            line-height: 1.8;
        }

        /* Card styles */
        .xk-card {
            background-color: #fff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            box-shadow: var(--xk-shadow-sm);
            overflow: hidden;
            transition: all var(--xk-transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .xk-card:hover {
            box-shadow: var(--xk-shadow-hover);
            border-color: var(--xk-border-hover);
            transform: translateY(-3px);
        }

        .xk-card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            background-color: var(--xk-bg-soft);
        }

        .xk-card-body {
            padding: 1.25rem 1.5rem 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .xk-card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.08);
            border-radius: var(--xk-radius-badge);
            padding: 2px 10px;
            margin-bottom: 0.6rem;
            align-self: flex-start;
        }

        .xk-card-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--xk-text);
            margin-bottom: 0.5rem;
            line-height: 1.5;
        }

        .xk-card-desc {
            font-size: 0.9rem;
            color: var(--xk-text-muted);
            line-height: 1.7;
            margin-bottom: 0.75rem;
            flex: 1;
        }

        .xk-card-date {
            font-size: 0.8rem;
            color: var(--xk-text-light);
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }

        .xk-card-date i {
            font-size: 0.75rem;
        }

        /* List card horizontal */
        .list-card-h {
            display: flex;
            gap: 1rem;
            background-color: #fff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            padding: 1rem 1.25rem;
            align-items: center;
            transition: all var(--xk-transition);
        }

        .list-card-h:hover {
            border-color: var(--xk-border-hover);
            box-shadow: var(--xk-shadow-sm);
        }

        .list-card-h img {
            width: 88px;
            height: 88px;
            border-radius: 8px;
            object-fit: cover;
            flex-shrink: 0;
        }

        .list-card-h .info {
            flex: 1;
            min-width: 0;
        }

        .list-card-h .info h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--xk-text);
            margin-bottom: 0.3rem;
            line-height: 1.5;
        }

        .list-card-h .info p {
            font-size: 0.85rem;
            color: var(--xk-text-muted);
            margin-bottom: 0;
            line-height: 1.6;
        }

        /* Metrics */
        .metric-item {
            text-align: left;
            padding: 1.25rem 1.5rem;
            border-left: 2px solid var(--xk-primary);
            background-color: #fff;
            border-radius: 8px;
            box-shadow: var(--xk-shadow-sm);
        }

        .metric-item .num {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--xk-deep);
            line-height: 1.2;
        }

        .metric-item .label {
            font-size: 0.85rem;
            color: var(--xk-text-muted);
            margin-top: 0.25rem;
        }

        /* FAQ */
        .faq-item {
            border: 1px solid var(--xk-border);
            border-radius: 10px;
            margin-bottom: 0.75rem;
            overflow: hidden;
            background-color: #fff;
            transition: border-color var(--xk-transition);
        }

        .faq-item:hover {
            border-color: var(--xk-border-hover);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1rem 1.25rem;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--xk-text);
            transition: background-color var(--xk-transition);
        }

        .faq-question:hover {
            background-color: var(--xk-bg-soft);
        }

        .faq-question .icon {
            flex-shrink: 0;
            color: var(--xk-primary);
            font-size: 0.9rem;
            transition: transform var(--xk-transition);
        }

        .faq-answer {
            padding: 0 1.25rem 1rem;
            font-size: 0.9rem;
            color: var(--xk-text-muted);
            line-height: 1.8;
            display: none;
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        .faq-item.open .faq-question .icon {
            transform: rotate(45deg);
        }

        /* Footer */
        .site-footer {
            background-color: var(--xk-deep);
            color: #e6edf7;
            padding: 3.5rem 0 0;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2rem;
            padding-bottom: 2.5rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .footer-brand-name {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.2rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 0.75rem;
        }

        .footer-brand p {
            font-size: 0.85rem;
            color: rgba(230, 237, 247, 0.7);
            line-height: 1.8;
            margin-bottom: 0;
            max-width: 320px;
        }

        .footer-col h5 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 1rem;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-col ul li {
            margin-bottom: 0.5rem;
        }

        .footer-col ul li a {
            font-size: 0.85rem;
            color: rgba(230, 237, 247, 0.7);
            transition: color var(--xk-transition);
        }

        .footer-col ul li a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.75rem;
            padding: 1.25rem 0 1.5rem;
            font-size: 0.8rem;
            color: rgba(230, 237, 247, 0.55);
        }

        .footer-icp {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .footer-bottom a {
            color: rgba(230, 237, 247, 0.55);
        }

        .footer-bottom a:hover {
            color: #ffffff;
        }

        /* CTA section */
        .cta-banner {
            background-color: var(--xk-deep);
            border-radius: var(--xk-radius-card);
            padding: 2.5rem 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 2rem;
            flex-wrap: wrap;
        }

        .cta-banner h3 {
            color: #ffffff;
            font-size: 1.4rem;
            font-weight: 700;
            margin-bottom: 0.3rem;
        }

        .cta-banner p {
            color: rgba(230, 237, 247, 0.7);
            font-size: 0.9rem;
            margin-bottom: 0;
        }

        /* Subscribe form */
        .subscribe-form {
            display: flex;
            gap: 0.75rem;
            max-width: 480px;
        }

        .subscribe-form input {
            flex: 1;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-btn);
            padding: 0.6rem 1rem;
            font-size: 0.9rem;
            color: var(--xk-text);
            transition: all var(--xk-transition);
            background-color: #fff;
        }

        .subscribe-form input:focus {
            border-color: var(--xk-primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
            outline: none;
        }

        /* Responsive */
        @media (max-width: 991.98px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .nav-toggle-xk {
                display: block;
            }
            .nav-links-xk {
                position: absolute;
                top: var(--xk-header-height);
                left: 0;
                right: 0;
                flex-direction: column;
                align-items: stretch;
                background-color: #fff;
                border-bottom: 1px solid var(--xk-border);
                box-shadow: var(--xk-shadow-md);
                padding: 1rem 1.5rem;
                gap: 0.25rem;
                display: none;
                z-index: 1040;
            }
            .nav-links-xk.open {
                display: flex;
            }
            .nav-item-xk {
                width: 100%;
            }
            .nav-link-xk {
                display: block;
                padding: 0.6rem 0.8rem;
                width: 100%;
            }
            .search-box-nav {
                max-width: none;
                flex: 1 1 auto;
            }
        }

        @media (max-width: 767.98px) {
            :root {
                --xk-section-padding: 56px;
            }
            .section {
                padding: var(--xk-section-padding) 0;
            }
            .category-hero h1 {
                font-size: 1.8rem;
            }
            .category-hero .hero-sub {
                font-size: 0.95rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .cta-banner {
                flex-direction: column;
                align-items: flex-start;
            }
            .subscribe-form {
                flex-direction: column;
                width: 100%;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
            .list-card-h {
                flex-direction: column;
                align-items: flex-start;
            }
            .list-card-h img {
                width: 100%;
                height: auto;
                aspect-ratio: 16/9;
            }
            .nav-wrap {
                flex-wrap: wrap;
                gap: 0.5rem;
            }
            .search-box-nav {
                order: 3;
                flex: 1 1 100%;
                max-width: none;
                margin: 0.25rem 0;
            }
        }

        @media (max-width: 575.98px) {
            :root {
                --xk-section-padding: 44px;
            }
            .section {
                padding: var(--xk-section-padding) 0;
            }
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .category-hero {
                padding: 2rem 0 1.75rem;
            }
            .category-hero h1 {
                font-size: 1.5rem;
            }
            .btn-lg {
                padding: 0.65rem 1.25rem;
                font-size: 0.9rem;
            }
        }

/* roulang page: category4 */
:root {
            --xk-primary: #2563eb;
            --xk-primary-hover: #1d4ed8;
            --xk-primary-light: #3b82f6;
            --xk-deep: #0f1f3d;
            --xk-deep-mid: #142d4c;
            --xk-bg: #ffffff;
            --xk-bg-soft: #f7f9fb;
            --xk-bg-blue: #eaf1fb;
            --xk-text: #1a2b4a;
            --xk-text-muted: #5b6b84;
            --xk-text-light: #8a97ad;
            --xk-border: #e3e8ef;
            --xk-border-hover: #b8c9e0;
            --xk-radius-card: 12px;
            --xk-radius-btn: 8px;
            --xk-radius-search: 28px;
            --xk-radius-badge: 6px;
            --xk-shadow-sm: 0 2px 8px rgba(15, 31, 61, 0.06);
            --xk-shadow-md: 0 4px 16px rgba(15, 31, 61, 0.10);
            --xk-shadow-hover: 0 8px 24px rgba(15, 31, 61, 0.14);
            --xk-font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
            --xk-transition: 200ms ease;
            --xk-transition-slow: 320ms cubic-bezier(0.4, 0, 0.2, 1);
            --xk-section-padding: 88px;
            --xk-header-height: 76px;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--xk-font-sans);
            font-size: 16px;
            line-height: 1.75;
            color: var(--xk-text);
            background-color: var(--xk-bg);
            overflow-x: hidden;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--xk-primary);
            text-decoration: none;
            transition: color var(--xk-transition);
        }

        a:hover {
            color: var(--xk-primary-hover);
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.35);
            outline-offset: 2px;
        }

        .container {
            max-width: 1140px;
            width: 100%;
            padding-left: 20px;
            padding-right: 20px;
            margin-left: auto;
            margin-right: auto;
        }

        .section {
            padding: var(--xk-section-padding) 0;
            position: relative;
        }

        .section-soft {
            background-color: var(--xk-bg-soft);
        }

        .section-blue-tint {
            background-color: var(--xk-bg-blue);
        }

        .section-deep {
            background-color: var(--xk-deep);
        }

        .section-deep h2,
        .section-deep h3,
        .section-deep p {
            color: #e6edf7;
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.08);
            border: 1px solid rgba(37, 99, 235, 0.18);
            padding: 4px 12px;
            border-radius: var(--xk-radius-badge);
            margin-bottom: 1rem;
        }

        .section-title-wrap {
            margin-bottom: 2.5rem;
        }

        .section-title-wrap .section-desc {
            max-width: 720px;
            font-size: 1rem;
            color: var(--xk-text-muted);
            line-height: 1.8;
            margin-top: 0.75rem;
        }

        .btn {
            font-weight: 600;
            border-radius: var(--xk-radius-btn);
            padding: 0.65rem 1.5rem;
            font-size: 0.95rem;
            transition: all var(--xk-transition);
            border: 1px solid transparent;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            justify-content: center;
        }

        .btn-primary {
            background-color: var(--xk-primary);
            border-color: var(--xk-primary);
            color: #ffffff;
        }

        .btn-primary:hover,
        .btn-primary:focus {
            background-color: var(--xk-primary-hover);
            border-color: var(--xk-primary-hover);
            color: #ffffff;
            box-shadow: var(--xk-shadow-md);
        }

        .btn-primary:active {
            background-color: #1e40af;
            border-color: #1e40af;
            box-shadow: none;
        }

        .btn-outline-primary {
            background-color: transparent;
            border-color: var(--xk-primary);
            color: var(--xk-primary);
        }

        .btn-outline-primary:hover,
        .btn-outline-primary:focus {
            background-color: var(--xk-primary);
            border-color: var(--xk-primary);
            color: #ffffff;
            box-shadow: var(--xk-shadow-md);
        }

        .btn-outline-light {
            background-color: transparent;
            border-color: rgba(255, 255, 255, 0.5);
            color: #ffffff;
        }

        .btn-outline-light:hover,
        .btn-outline-light:focus {
            background-color: rgba(255, 255, 255, 0.12);
            border-color: #ffffff;
            color: #ffffff;
        }

        .btn-sm {
            padding: 0.4rem 0.9rem;
            font-size: 0.85rem;
        }

        .btn-lg {
            padding: 0.8rem 2rem;
            font-size: 1rem;
        }

        /* Header / Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background-color: #ffffff;
            border-bottom: 1px solid var(--xk-border);
            min-height: var(--xk-header-height);
            display: flex;
            align-items: center;
            transition: box-shadow var(--xk-transition);
        }

        .site-header.scrolled {
            box-shadow: var(--xk-shadow-sm);
        }

        .nav-wrap {
            display: flex;
            align-items: center;
            gap: 16px;
            width: 100%;
            flex-wrap: nowrap;
        }

        .navbar-brand-xk {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--xk-deep);
            white-space: nowrap;
            text-decoration: none;
            transition: color var(--xk-transition);
        }

        .navbar-brand-xk:hover {
            color: var(--xk-primary);
        }

        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--xk-primary) 0%, var(--xk-deep-mid) 100%);
            color: #ffffff;
            border-radius: 50%;
            font-size: 0.95rem;
            flex-shrink: 0;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
        }

        .search-box-nav {
            position: relative;
            flex: 1 1 auto;
            max-width: 380px;
            min-width: 160px;
            margin-left: 8px;
        }

        .search-box-nav input {
            width: 100%;
            height: 42px;
            border-radius: var(--xk-radius-search);
            border: 1px solid var(--xk-border);
            padding: 0 42px 0 20px;
            font-size: 0.9rem;
            background-color: var(--xk-bg-soft);
            transition: all var(--xk-transition);
            color: var(--xk-text);
        }

        .search-box-nav input::placeholder {
            color: var(--xk-text-light);
        }

        .search-box-nav input:focus {
            border-color: var(--xk-primary);
            background-color: #ffffff;
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
            outline: none;
        }

        .search-icon {
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--xk-text-light);
            font-size: 0.9rem;
            pointer-events: none;
            transition: color var(--xk-transition);
        }

        .search-box-nav input:focus+.search-icon {
            color: var(--xk-primary);
        }

        .nav-toggle-xk {
            display: none;
            background: none;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-btn);
            width: 42px;
            height: 42px;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--xk-deep);
            cursor: pointer;
            transition: all var(--xk-transition);
            flex-shrink: 0;
        }

        .nav-toggle-xk:hover {
            background-color: var(--xk-bg-soft);
            border-color: var(--xk-border-hover);
        }

        .nav-links-xk {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            margin: 0;
            padding: 0;
            flex-wrap: nowrap;
            white-space: nowrap;
        }

        .nav-item-xk {
            position: relative;
        }

        .nav-link-xk {
            display: block;
            padding: 0.5rem 0.75rem;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--xk-text-muted);
            border-radius: var(--xk-radius-btn);
            transition: all var(--xk-transition);
            text-decoration: none;
        }

        .nav-link-xk:hover {
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.06);
        }

        .nav-link-xk.active {
            color: #ffffff;
            background-color: var(--xk-primary);
            font-weight: 600;
        }

        .nav-link-xk.active:hover {
            color: #ffffff;
            background-color: var(--xk-primary-hover);
        }

        /* Breadcrumb */
        .breadcrumb-xk {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--xk-text-light);
            flex-wrap: wrap;
            margin: 0 0 1rem 0;
            padding: 0;
            list-style: none;
        }

        .breadcrumb-xk li {
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .breadcrumb-xk li+li::before {
            content: "/";
            color: var(--xk-text-light);
            font-size: 0.85rem;
        }

        .breadcrumb-xk a {
            color: var(--xk-text-muted);
            text-decoration: none;
            transition: color var(--xk-transition);
        }

        .breadcrumb-xk a:hover {
            color: var(--xk-primary);
        }

        .breadcrumb-xk .current {
            color: var(--xk-primary);
            font-weight: 600;
        }

        /* Category Hero */
        .category-hero {
            background-color: var(--xk-bg-soft);
            border-bottom: 1px solid var(--xk-border);
            padding: 3rem 0 2.5rem;
        }

        .category-hero h1 {
            font-size: clamp(2rem, 3.5vw, 2.75rem);
            font-weight: 700;
            color: var(--xk-deep);
            margin: 0 0 1rem 0;
            line-height: 1.25;
        }

        .category-hero .cat-desc {
            max-width: 780px;
            font-size: 1.05rem;
            color: var(--xk-text-muted);
            line-height: 1.85;
            margin: 0;
        }

        /* Card Grid */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 24px;
        }

        .article-card {
            background: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            overflow: hidden;
            transition: all var(--xk-transition-slow);
            display: flex;
            flex-direction: column;
            height: 100%;
            box-shadow: var(--xk-shadow-sm);
        }

        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--xk-shadow-hover);
            border-color: var(--xk-border-hover);
        }

        .article-card .card-img-wrap {
            overflow: hidden;
            aspect-ratio: 16/9;
            background-color: var(--xk-bg-blue);
            position: relative;
        }

        .article-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--xk-transition-slow);
        }

        .article-card:hover .card-img-wrap img {
            transform: scale(1.03);
        }

        .article-card .card-body-xk {
            padding: 20px 22px 22px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .article-card .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.08);
            padding: 3px 10px;
            border-radius: var(--xk-radius-badge);
            margin-bottom: 10px;
            align-self: flex-start;
            letter-spacing: 0.03em;
        }

        .article-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--xk-deep);
            margin: 0 0 10px 0;
            line-height: 1.5;
        }

        .article-card .card-summary {
            font-size: 0.9rem;
            color: var(--xk-text-muted);
            line-height: 1.7;
            margin: 0 0 16px 0;
            flex: 1;
        }

        .article-card .card-meta {
            font-size: 0.8rem;
            color: var(--xk-text-light);
            display: flex;
            align-items: center;
            gap: 12px;
            border-top: 1px solid var(--xk-border);
            padding-top: 14px;
        }

        .article-card .card-meta i {
            color: var(--xk-text-light);
            width: 14px;
            text-align: center;
        }

        /* Hot list */
        .hot-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 18px;
        }

        .hot-item {
            background: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            padding: 18px 20px;
            transition: all var(--xk-transition);
            display: flex;
            flex-direction: column;
            gap: 8px;
            box-shadow: var(--xk-shadow-sm);
        }

        .hot-item:hover {
            border-color: var(--xk-border-hover);
            box-shadow: var(--xk-shadow-hover);
            transform: translateY(-2px);
        }

        .hot-item .hot-rank {
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--xk-primary);
            letter-spacing: 0.04em;
        }

        .hot-item h4 {
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--xk-deep);
            margin: 0;
            line-height: 1.5;
        }

        .hot-item p {
            font-size: 0.85rem;
            color: var(--xk-text-muted);
            margin: 0;
            line-height: 1.6;
        }

        .hot-item .hot-meta {
            font-size: 0.78rem;
            color: var(--xk-text-light);
        }

        /* Topic entries */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 20px;
        }

        .topic-card {
            background: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            padding: 22px 24px;
            transition: all var(--xk-transition);
            text-decoration: none;
            color: var(--xk-text);
            box-shadow: var(--xk-shadow-sm);
        }

        .topic-card:hover {
            border-color: var(--xk-primary);
            box-shadow: var(--xk-shadow-hover);
            transform: translateY(-3px);
            color: var(--xk-text);
        }

        .topic-card .topic-icon {
            width: 42px;
            height: 42px;
            border-radius: 10px;
            background-color: var(--xk-bg-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--xk-primary);
            font-size: 1.1rem;
            margin-bottom: 12px;
        }

        .topic-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--xk-deep);
            margin: 0 0 6px 0;
        }

        .topic-card p {
            font-size: 0.88rem;
            color: var(--xk-text-muted);
            margin: 0;
            line-height: 1.65;
        }

        /* Data strip */
        .data-strip {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 0;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            overflow: hidden;
            background: #ffffff;
            box-shadow: var(--xk-shadow-sm);
        }

        .data-strip .data-item {
            padding: 22px 18px;
            text-align: center;
            border-right: 1px solid var(--xk-border);
            transition: background-color var(--xk-transition);
        }

        .data-strip .data-item:last-child {
            border-right: none;
        }

        .data-strip .data-item:hover {
            background-color: var(--xk-bg-soft);
        }

        .data-strip .data-number {
            font-size: 1.65rem;
            font-weight: 700;
            color: var(--xk-deep);
            line-height: 1.2;
            margin-bottom: 4px;
        }

        .data-strip .data-label {
            font-size: 0.82rem;
            color: var(--xk-text-muted);
            line-height: 1.5;
        }

        /* FAQ */
        .accordion-xk {
            max-width: 760px;
            margin: 0 auto;
        }

        .accordion-item-xk {
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card) !important;
            margin-bottom: 12px;
            overflow: hidden;
            background: #ffffff;
            box-shadow: var(--xk-shadow-sm);
            transition: border-color var(--xk-transition);
        }

        .accordion-item-xk:hover {
            border-color: var(--xk-border-hover);
        }

        .accordion-header-xk {
            margin: 0;
        }

        .accordion-btn-xk {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 22px;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--xk-deep);
            text-align: left;
            transition: background-color var(--xk-transition);
        }

        .accordion-btn-xk:hover {
            background-color: var(--xk-bg-soft);
        }

        .accordion-btn-xk .accordion-icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background-color: var(--xk-bg-blue);
            color: var(--xk-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
            transition: transform var(--xk-transition);
        }

        .accordion-item-xk.open .accordion-icon {
            transform: rotate(180deg);
            background-color: var(--xk-primary);
            color: #ffffff;
        }

        .accordion-body-xk {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--xk-transition-slow), padding var(--xk-transition-slow);
            padding: 0 22px;
            background-color: var(--xk-bg-soft);
        }

        .accordion-item-xk.open .accordion-body-xk {
            max-height: 400px;
            padding: 16px 22px 20px;
        }

        .accordion-body-xk p {
            font-size: 0.92rem;
            color: var(--xk-text-muted);
            line-height: 1.8;
            margin: 0;
        }

        /* CTA section */
        .cta-box {
            background-color: var(--xk-deep);
            border-radius: var(--xk-radius-card);
            padding: 48px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
            box-shadow: 0 16px 40px rgba(15, 31, 61, 0.2);
        }

        .cta-box h2 {
            font-size: 1.75rem;
            font-weight: 700;
            color: #ffffff;
            margin: 0 0 8px 0;
        }

        .cta-box p {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.75);
            margin: 0;
            line-height: 1.7;
        }

        /* More link */
        .more-link-wrap {
            text-align: center;
            margin-top: 32px;
        }

        .more-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--xk-primary);
            border-bottom: 2px solid transparent;
            padding-bottom: 4px;
            transition: all var(--xk-transition);
            text-decoration: none;
        }

        .more-link:hover {
            border-bottom-color: var(--xk-primary);
            color: var(--xk-primary-hover);
        }

        /* Footer */
        .site-footer {
            background-color: var(--xk-deep);
            color: rgba(255, 255, 255, 0.85);
            padding: 48px 0 24px;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand-name {
            font-size: 1.35rem;
            font-weight: 700;
            color: #ffffff;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
        }

        .footer-brand-name .brand-icon {
            width: 32px;
            height: 32px;
            font-size: 0.9rem;
        }

        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.8;
            margin: 0;
            max-width: 340px;
        }

        .footer-col h5 {
            font-size: 0.9rem;
            font-weight: 700;
            color: #ffffff;
            margin: 0 0 14px 0;
            letter-spacing: 0.03em;
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul a {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color var(--xk-transition);
        }

        .footer-col ul a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding-top: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }

        .footer-icp {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.55);
        }

        .footer-bottom a {
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color var(--xk-transition);
        }

        .footer-bottom a:hover {
            color: #ffffff;
        }

        /* Responsive */
        @media (max-width: 1200px) {
            .container {
                max-width: 1140px;
            }
        }

        @media (max-width: 992px) {
            :root {
                --xk-section-padding: 56px;
            }
            .nav-wrap {
                flex-wrap: wrap;
                gap: 12px;
            }
            .search-box-nav {
                order: 3;
                flex: 1 1 100%;
                max-width: 100%;
                margin-left: 0;
            }
            .nav-toggle-xk {
                display: flex;
                margin-left: auto;
            }
            .nav-links-xk {
                display: none;
                flex-direction: column;
                width: 100%;
                order: 4;
                background: #ffffff;
                border: 1px solid var(--xk-border);
                border-radius: var(--xk-radius-card);
                padding: 12px;
                box-shadow: var(--xk-shadow-md);
                gap: 4px;
            }
            .nav-links-xk.mobile-open {
                display: flex;
            }
            .nav-link-xk {
                width: 100%;
                text-align: left;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --xk-section-padding: 44px;
            }
            .category-hero {
                padding: 2rem 0 1.5rem;
            }
            .category-hero h1 {
                font-size: 1.8rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .hot-list {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .topic-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .data-strip {
                grid-template-columns: 1fr 1fr;
            }
            .data-strip .data-item {
                border-right: 1px solid var(--xk-border);
                border-bottom: 1px solid var(--xk-border);
            }
            .data-strip .data-item:nth-child(2n) {
                border-right: none;
            }
            .data-strip .data-item:nth-last-child(-n+2) {
                border-bottom: none;
            }
            .cta-box {
                padding: 32px 24px;
                flex-direction: column;
                text-align: center;
                align-items: stretch;
            }
            .cta-box .btn {
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                align-items: center;
            }
            .footer-icp {
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            .card-grid {
                grid-template-columns: 1fr;
            }
            .data-strip {
                grid-template-columns: 1fr;
            }
            .data-strip .data-item {
                border-right: none;
                border-bottom: 1px solid var(--xk-border);
            }
            .data-strip .data-item:last-child {
                border-bottom: none;
            }
            .category-hero h1 {
                font-size: 1.5rem;
            }
            .article-card .card-body-xk {
                padding: 16px 16px 18px;
            }
            .cta-box h2 {
                font-size: 1.35rem;
            }
        }

/* roulang page: category6 */
:root {
            --xk-primary: #2563eb;
            --xk-primary-hover: #1d4ed8;
            --xk-primary-light: #3b82f6;
            --xk-deep: #0f1f3d;
            --xk-deep-mid: #142d4c;
            --xk-bg: #ffffff;
            --xk-bg-soft: #f7f9fb;
            --xk-bg-blue: #eaf1fb;
            --xk-text: #1a2b4a;
            --xk-text-muted: #5b6b84;
            --xk-text-light: #8a97ad;
            --xk-border: #e3e8ef;
            --xk-border-hover: #b8c9e0;
            --xk-radius-card: 12px;
            --xk-radius-btn: 8px;
            --xk-radius-search: 28px;
            --xk-radius-badge: 6px;
            --xk-shadow-sm: 0 2px 8px rgba(15, 31, 61, 0.06);
            --xk-shadow-md: 0 4px 16px rgba(15, 31, 61, 0.10);
            --xk-shadow-hover: 0 8px 24px rgba(15, 31, 61, 0.14);
            --xk-font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
            --xk-transition: 200ms ease;
            --xk-transition-slow: 320ms cubic-bezier(0.4, 0, 0.2, 1);
            --xk-section-padding: 72px;
            --xk-header-height: 76px;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--xk-font-sans);
            font-size: 16px;
            line-height: 1.75;
            color: var(--xk-text);
            background-color: var(--xk-bg);
            overflow-x: hidden;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--xk-primary);
            text-decoration: none;
            transition: color var(--xk-transition);
        }

        a:hover {
            color: var(--xk-primary-hover);
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.35);
            outline-offset: 2px;
        }

        .container {
            max-width: 1170px;
            width: 100%;
            padding-left: 20px;
            padding-right: 20px;
            margin-left: auto;
            margin-right: auto;
        }

        .section {
            padding: var(--xk-section-padding) 0;
            position: relative;
        }

        .section-soft {
            background-color: var(--xk-bg-soft);
        }

        .section-blue-tint {
            background-color: var(--xk-bg-blue);
        }

        .section-deep {
            background-color: var(--xk-deep);
        }

        .section-deep h2,
        .section-deep h3,
        .section-deep p {
            color: #e6edf7;
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.08);
            border: 1px solid rgba(37, 99, 235, 0.18);
            padding: 4px 12px;
            border-radius: var(--xk-radius-badge);
            margin-bottom: 1rem;
        }

        .section-title-wrap {
            margin-bottom: 2.5rem;
        }

        .section-title-wrap .section-desc {
            max-width: 720px;
            font-size: 1rem;
            color: var(--xk-text-muted);
            line-height: 1.8;
            margin-top: 0.75rem;
        }

        .btn {
            font-weight: 600;
            border-radius: var(--xk-radius-btn);
            padding: 0.6rem 1.4rem;
            font-size: 0.95rem;
            transition: all var(--xk-transition);
            border: 1px solid transparent;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            justify-content: center;
        }

        .btn-primary {
            background-color: var(--xk-primary);
            border-color: var(--xk-primary);
            color: #ffffff;
        }

        .btn-primary:hover,
        .btn-primary:focus {
            background-color: var(--xk-primary-hover);
            border-color: var(--xk-primary-hover);
            color: #ffffff;
            box-shadow: var(--xk-shadow-md);
        }

        .btn-primary:active {
            background-color: #1e40af;
            border-color: #1e40af;
            box-shadow: none;
        }

        .btn-outline-primary {
            background-color: transparent;
            border-color: var(--xk-primary);
            color: var(--xk-primary);
        }

        .btn-outline-primary:hover,
        .btn-outline-primary:focus {
            background-color: var(--xk-primary);
            border-color: var(--xk-primary);
            color: #ffffff;
            box-shadow: var(--xk-shadow-md);
        }

        .btn-sm {
            padding: 0.4rem 0.9rem;
            font-size: 0.85rem;
        }

        /* Header / Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background-color: #ffffff;
            border-bottom: 1px solid var(--xk-border);
            min-height: var(--xk-header-height);
            display: flex;
            align-items: center;
            transition: box-shadow var(--xk-transition);
        }

        .site-header.scrolled {
            box-shadow: var(--xk-shadow-sm);
        }

        .nav-wrap {
            display: flex;
            align-items: center;
            gap: 1.2rem;
            flex-wrap: wrap;
            position: relative;
        }

        .navbar-brand-xk {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--xk-deep);
            letter-spacing: 0.02em;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .navbar-brand-xk:hover {
            color: var(--xk-primary);
        }

        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            border-radius: 8px;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(37, 99, 235, 0.22));
            color: var(--xk-primary);
            font-size: 0.9rem;
            flex-shrink: 0;
        }

        .search-box-nav {
            position: relative;
            flex: 1 1 280px;
            max-width: 420px;
            min-width: 200px;
            margin-left: auto;
            margin-right: auto;
        }

        .search-box-nav input {
            width: 100%;
            border-radius: var(--xk-radius-search);
            border: 1px solid var(--xk-border);
            padding: 0.55rem 2.6rem 0.55rem 1.2rem;
            font-size: 0.9rem;
            background-color: var(--xk-bg-soft);
            transition: all var(--xk-transition);
            color: var(--xk-text);
            line-height: 1.5;
        }

        .search-box-nav input::placeholder {
            color: var(--xk-text-light);
        }

        .search-box-nav input:focus {
            border-color: var(--xk-primary);
            background-color: #ffffff;
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
            outline: none;
        }

        .search-box-nav .search-icon {
            position: absolute;
            right: 1.1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--xk-text-light);
            font-size: 0.9rem;
            pointer-events: none;
            transition: color var(--xk-transition);
        }

        .search-box-nav input:focus~.search-icon {
            color: var(--xk-primary);
        }

        .nav-toggle-xk {
            display: none;
            background: none;
            border: none;
            font-size: 1.4rem;
            color: var(--xk-deep);
            cursor: pointer;
            padding: 0.4rem;
            border-radius: 6px;
            transition: background-color var(--xk-transition);
            flex-shrink: 0;
        }

        .nav-toggle-xk:hover {
            background-color: var(--xk-bg-soft);
        }

        .nav-links-xk {
            display: flex;
            align-items: center;
            gap: 0.3rem;
            list-style: none;
            padding: 0;
            margin: 0;
            flex-shrink: 0;
            flex-wrap: wrap;
        }

        .nav-item-xk {
            list-style: none;
            margin: 0;
        }

        .nav-link-xk {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 0.5rem 0.9rem;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--xk-text-muted);
            border-radius: 6px;
            white-space: nowrap;
            transition: all var(--xk-transition);
            position: relative;
        }

        .nav-link-xk:hover {
            color: var(--xk-primary);
            background-color: var(--xk-bg-soft);
        }

        .nav-link-xk.active {
            color: var(--xk-primary);
            background-color: rgba(37, 99, 235, 0.08);
            font-weight: 600;
        }

        .nav-link-xk.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background-color: var(--xk-primary);
            border-radius: 2px;
        }

        /* Breadcrumb */
        .breadcrumb-xk {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--xk-text-light);
            margin-bottom: 0.75rem;
            flex-wrap: wrap;
        }

        .breadcrumb-xk a {
            color: var(--xk-text-muted);
            transition: color var(--xk-transition);
        }

        .breadcrumb-xk a:hover {
            color: var(--xk-primary);
        }

        .breadcrumb-xk .separator {
            color: var(--xk-border-hover);
            font-size: 0.75rem;
        }

        .breadcrumb-xk .current {
            color: var(--xk-primary);
            font-weight: 500;
        }

        /* 分类页 Hero */
        .page-hero {
            background-color: var(--xk-bg-soft);
            border-bottom: 1px solid var(--xk-border);
            padding: 2.2rem 0 2rem;
            position: relative;
            overflow: hidden;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -60px;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.06), transparent 70%);
            pointer-events: none;
        }

        .page-hero h1 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--xk-deep);
            margin-bottom: 0.6rem;
            line-height: 1.3;
        }

        .page-hero .hero-desc {
            font-size: 1rem;
            color: var(--xk-text-muted);
            max-width: 680px;
            line-height: 1.8;
            margin-bottom: 0;
        }

        /* 卡片样式 */
        .topic-card {
            background: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            height: 100%;
            transition: all var(--xk-transition-slow);
            box-shadow: var(--xk-shadow-sm);
        }

        .topic-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--xk-shadow-hover);
            border-color: var(--xk-border-hover);
        }

        .topic-card .card-img-wrap {
            position: relative;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background-color: var(--xk-bg-soft);
        }

        .topic-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 400ms ease;
        }

        .topic-card:hover .card-img-wrap img {
            transform: scale(1.03);
        }

        .topic-card .card-body {
            padding: 1.2rem 1.3rem 1.4rem;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .card-tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.75rem;
            font-weight: 500;
            padding: 2px 10px;
            border-radius: var(--xk-radius-badge);
            background-color: var(--xk-bg-blue);
            color: var(--xk-primary);
            margin-bottom: 0.7rem;
            width: fit-content;
        }

        .topic-card .card-title {
            font-size: 1.05rem;
            font-weight: 650;
            color: var(--xk-deep);
            margin-bottom: 0.55rem;
            line-height: 1.45;
        }

        .topic-card .card-text {
            font-size: 0.9rem;
            color: var(--xk-text-muted);
            line-height: 1.7;
            margin-bottom: 0.9rem;
            flex: 1;
        }

        .topic-card .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.8rem;
            color: var(--xk-text-light);
            padding-top: 0.8rem;
            border-top: 1px solid var(--xk-border);
        }

        .topic-card .card-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        /* 简卡 */
        .hot-card {
            background: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            padding: 1.1rem 1.3rem;
            display: flex;
            align-items: flex-start;
            gap: 0.9rem;
            transition: all var(--xk-transition);
            cursor: pointer;
            height: 100%;
        }

        .hot-card:hover {
            box-shadow: var(--xk-shadow-md);
            border-color: var(--xk-border-hover);
            transform: translateY(-2px);
        }

        .hot-card .hot-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 8px;
            background-color: var(--xk-bg-blue);
            color: var(--xk-primary);
            font-size: 0.85rem;
            flex-shrink: 0;
            margin-top: 0.1rem;
        }

        .hot-card .hot-body {
            flex: 1;
            min-width: 0;
        }

        .hot-card .hot-title {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--xk-deep);
            line-height: 1.5;
            margin-bottom: 0.3rem;
        }

        .hot-card .hot-meta {
            font-size: 0.8rem;
            color: var(--xk-text-light);
        }

        /* 数据速览 */
        .data-strip {
            display: flex;
            gap: 1.5rem;
            flex-wrap: wrap;
            align-items: stretch;
        }

        .data-item {
            flex: 1 1 180px;
            background: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            padding: 1.2rem 1.4rem;
            text-align: center;
            transition: all var(--xk-transition);
        }

        .data-item:hover {
            box-shadow: var(--xk-shadow-md);
            border-color: var(--xk-border-hover);
        }

        .data-item .data-num {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--xk-primary);
            letter-spacing: -0.02em;
            line-height: 1.3;
        }

        .data-item .data-label {
            font-size: 0.85rem;
            color: var(--xk-text-muted);
            margin-top: 0.2rem;
        }

        /* FAQ */
        .faq-list-xk {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }

        .faq-item {
            background: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            overflow: hidden;
            transition: all var(--xk-transition);
        }

        .faq-item:hover {
            border-color: var(--xk-border-hover);
        }

        .faq-item.open {
            box-shadow: var(--xk-shadow-sm);
            border-color: rgba(37, 99, 235, 0.3);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1rem 1.3rem;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--xk-deep);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            line-height: 1.5;
            transition: color var(--xk-transition);
        }

        .faq-question:hover {
            color: var(--xk-primary);
        }

        .faq-question .faq-toggle-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background-color: var(--xk-bg-soft);
            color: var(--xk-text-muted);
            font-size: 0.75rem;
            transition: all var(--xk-transition);
        }

        .faq-item.open .faq-question .faq-toggle-icon {
            background-color: var(--xk-primary);
            color: #ffffff;
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--xk-transition-slow);
            background-color: var(--xk-bg-soft);
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
        }

        .faq-answer-inner {
            padding: 1rem 1.3rem 1.2rem;
            font-size: 0.9rem;
            color: var(--xk-text-muted);
            line-height: 1.8;
            border-top: 1px solid var(--xk-border);
        }

        /* 订阅表单 */
        .subscribe-form-xk {
            display: flex;
            gap: 0.8rem;
            align-items: center;
            flex-wrap: wrap;
            max-width: 560px;
        }

        .subscribe-form-xk input {
            flex: 1 1 260px;
            padding: 0.65rem 1.2rem;
            border-radius: var(--xk-radius-btn);
            border: 1px solid var(--xk-border);
            font-size: 0.95rem;
            color: var(--xk-text);
            background-color: #ffffff;
            transition: all var(--xk-transition);
            line-height: 1.5;
        }

        .subscribe-form-xk input::placeholder {
            color: var(--xk-text-light);
        }

        .subscribe-form-xk input:focus {
            border-color: var(--xk-primary);
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
            outline: none;
        }

        .subscribe-form-xk .btn {
            flex-shrink: 0;
        }

        /* 相关专题卡片 */
        .topic-link-card {
            background: #ffffff;
            border: 1px solid var(--xk-border);
            border-radius: var(--xk-radius-card);
            padding: 1.2rem 1.4rem;
            display: flex;
            align-items: center;
            gap: 1rem;
            transition: all var(--xk-transition);
            height: 100%;
        }

        .topic-link-card:hover {
            box-shadow: var(--xk-shadow-md);
            border-color: var(--xk-border-hover);
            transform: translateY(-3px);
        }

        .topic-link-card .link-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background-color: var(--xk-bg-blue);
            color: var(--xk-primary);
            font-size: 1rem;
            flex-shrink: 0;
        }

        .topic-link-card .link-body {
            flex: 1;
            min-width: 0;
        }

        .topic-link-card .link-title {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--xk-deep);
            line-height: 1.5;
            margin-bottom: 0.2rem;
        }

        .topic-link-card .link-desc {
            font-size: 0.8rem;
            color: var(--xk-text-muted);
            line-height: 1.6;
        }

        .topic-link-card .link-arrow {
            color: var(--xk-border-hover);
            font-size: 0.85rem;
            flex-shrink: 0;
            transition: all var(--xk-transition);
        }

        .topic-link-card:hover .link-arrow {
            color: var(--xk-primary);
            transform: translateX(4px);
        }

        /* Footer */
        .site-footer {
            background-color: var(--xk-deep);
            color: #e6edf7;
            padding-top: 3.5rem;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 2.5rem;
            padding-bottom: 2.5rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-brand-name {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1.1rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 0.9rem;
        }

        .footer-brand p {
            font-size: 0.9rem;
            color: #9aabbf;
            line-height: 1.8;
            margin-bottom: 0;
        }

        .footer-col h5 {
            font-size: 0.9rem;
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 1rem;
            letter-spacing: 0.03em;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 0.45rem;
        }

        .footer-col ul a {
            font-size: 0.88rem;
            color: #9aabbf;
            transition: color var(--xk-transition);
        }

        .footer-col ul a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 0.6rem;
            padding: 1.2rem 0 1.4rem;
            font-size: 0.82rem;
            color: #7b8da3;
        }

        .footer-icp {
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem;
            align-items: center;
        }

        .footer-icp span {
            white-space: nowrap;
        }

        .footer-bottom a {
            color: #9aabbf;
            transition: color var(--xk-transition);
        }

        .footer-bottom a:hover {
            color: #ffffff;
        }

        /* 响应式 */
        @media (max-width: 992px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }
            .nav-wrap {
                gap: 0.8rem;
            }
            .search-box-nav {
                flex-basis: 100%;
                order: 3;
                max-width: 100%;
                margin: 0;
            }
            .nav-links-xk {
                flex-wrap: wrap;
            }
        }

        @media (max-width: 768px) {
            .nav-toggle-xk {
                display: inline-flex;
                align-items: center;
                justify-content: center;
            }
            .nav-links-xk {
                display: none;
                flex-direction: column;
                align-items: flex-start;
                gap: 0;
                width: 100%;
                background: #ffffff;
                border-radius: 0 0 12px 12px;
                padding: 0.5rem 0;
                box-shadow: var(--xk-shadow-md);
            }
            .nav-links-xk.show {
                display: flex;
            }
            .nav-item-xk {
                width: 100%;
            }
            .nav-link-xk {
                width: 100%;
                padding: 0.7rem 1.2rem;
                border-radius: 0;
            }
            .nav-link-xk.active::after {
                display: none;
            }
            .search-box-nav {
                order: initial;
                flex-basis: auto;
                flex: 1;
                min-width: 0;
            }
            .nav-wrap {
                flex-wrap: nowrap;
                gap: 0.6rem;
            }
            .navbar-brand-xk {
                font-size: 1.15rem;
            }
            .brand-icon {
                width: 30px;
                height: 30px;
                font-size: 0.8rem;
            }
            .search-box-nav input {
                font-size: 0.82rem;
                padding: 0.45rem 2.2rem 0.45rem 0.9rem;
            }
            .page-hero h1 {
                font-size: 1.55rem;
            }
            .page-hero .hero-desc {
                font-size: 0.92rem;
            }
            .section {
                padding: 48px 0;
            }
            .data-strip {
                gap: 0.8rem;
            }
            .data-item {
                flex-basis: 45%;
                padding: 1rem;
            }
            .data-item .data-num {
                font-size: 1.4rem;
            }
            .subscribe-form-xk {
                flex-direction: column;
                align-items: stretch;
                max-width: 100%;
            }
            .subscribe-form-xk input {
                flex: 1 1 auto;
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 0.5rem;
            }
            .data-item {
                flex-basis: 100%;
            }
            .page-hero {
                padding: 1.6rem 0 1.5rem;
            }
            .page-hero h1 {
                font-size: 1.35rem;
            }
            .topic-card .card-title {
                font-size: 0.98rem;
            }
            .topic-card .card-text {
                font-size: 0.85rem;
            }
            .hot-card {
                padding: 0.9rem 1rem;
            }
            .breadcrumb-xk {
                font-size: 0.78rem;
            }
        }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}