/* roulang page: index */
:root {
            --color-primary: #1a56db;
            --color-primary-dark: #1347b8;
            --color-primary-light: #e8f0fe;
            --color-accent: #0ea5e9;
            --color-accent-dark: #0284c7;
            --color-surface: #f8fafc;
            --color-surface-alt: #f1f5f9;
            --color-text-main: #1e293b;
            --color-text-soft: #64748b;
            --color-text-muted: #94a3b8;
            --color-border: #e2e8f0;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --color-danger: #ef4444;
            --color-card-bg: #ffffff;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-tag: 6px;
            --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-card-hover: 0 10px 25px rgba(0, 0, 0, 0.10), 0 4px 10px rgba(0, 0, 0, 0.06);
            --shadow-nav: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-btn: 0 2px 6px rgba(26, 86, 219, 0.25);
            --shadow-btn-hover: 0 6px 18px rgba(26, 86, 219, 0.35);
            --transition-base: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        body {
            font-family: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            line-height: 1.6;
            background-color: var(--color-surface);
            color: var(--color-text-main);
            min-height: 100vh;
            padding-bottom: 0;
        }

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

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-base);
        }

        button {
            cursor: pointer;
            font-family: inherit;
        }

        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        .container {
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* Header / Desktop Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border);
            box-shadow: var(--shadow-nav);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 60px;
            gap: 24px;
        }
        .header-logo {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .header-logo .logo-icon {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1rem;
        }
        .header-nav {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
        }
        .header-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-btn);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--color-text-soft);
            transition: all var(--transition-base);
            white-space: nowrap;
        }
        .header-nav a:hover {
            color: var(--color-primary);
            background: var(--color-primary-light);
        }
        .header-nav a.active {
            color: var(--color-primary);
            background: var(--color-primary-light);
            font-weight: 600;
        }
        .header-cta {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            padding: 10px 20px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 0.93rem;
            border: none;
            transition: all var(--transition-smooth);
            white-space: nowrap;
            cursor: pointer;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--color-primary);
            color: #fff;
            box-shadow: var(--shadow-btn);
        }
        .btn-primary:hover {
            background: var(--color-primary-dark);
            box-shadow: var(--shadow-btn-hover);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow-btn);
        }
        .btn-outline {
            background: transparent;
            color: var(--color-primary);
            border: 2px solid var(--color-primary);
        }
        .btn-outline:hover {
            background: var(--color-primary-light);
            border-color: var(--color-primary-dark);
            color: var(--color-primary-dark);
        }
        .btn-accent {
            background: var(--color-accent);
            color: #fff;
            box-shadow: 0 2px 6px rgba(14, 165, 233, 0.25);
        }
        .btn-accent:hover {
            background: var(--color-accent-dark);
            box-shadow: 0 6px 18px rgba(14, 165, 233, 0.35);
            transform: translateY(-1px);
        }
        .btn-lg {
            padding: 13px 28px;
            font-size: 1.05rem;
            border-radius: 10px;
        }
        .btn-sm {
            padding: 6px 14px;
            font-size: 0.85rem;
            border-radius: 6px;
        }

        /* Mobile Bottom Tab Navigation */
        .mobile-bottom-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 200;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-top: 1px solid var(--color-border);
            box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.06);
            padding: 6px 8px;
            padding-bottom: max(6px, env(safe-area-inset-bottom));
        }
        .mobile-bottom-nav .tab-list {
            display: flex;
            align-items: center;
            justify-content: space-around;
            list-style: none;
            max-width: 500px;
            margin: 0 auto;
        }
        .mobile-bottom-nav .tab-item a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 3px;
            padding: 6px 12px;
            border-radius: 10px;
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--color-text-muted);
            transition: all var(--transition-base);
            min-width: 56px;
            text-align: center;
        }
        .mobile-bottom-nav .tab-item a i {
            font-size: 1.25rem;
            transition: color var(--transition-base);
        }
        .mobile-bottom-nav .tab-item a.active {
            color: var(--color-primary);
        }
        .mobile-bottom-nav .tab-item a.active i {
            color: var(--color-primary);
        }
        .mobile-bottom-nav .tab-item a:hover {
            color: var(--color-primary);
            background: var(--color-primary-light);
        }

        /* Hero Section */
        .hero-section {
            position: relative;
            background: linear-gradient(160deg, #0f172a 0%, #1e3a5f 40%, #1a4b7a 70%, #0f2d4a 100%);
            padding: 80px 0 90px;
            overflow: hidden;
            color: #fff;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.18;
            pointer-events: none;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60px;
            background: linear-gradient(to top, var(--color-surface), transparent);
            pointer-events: none;
        }
        .hero-inner {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .hero-text h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 16px;
            letter-spacing: 0.03em;
        }
        .hero-text h1 .highlight {
            background: linear-gradient(135deg, #60a5fa, #38bdf8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            color: transparent;
        }
        .hero-text p {
            font-size: 1.12rem;
            color: #cbd5e1;
            line-height: 1.7;
            margin-bottom: 28px;
            max-width: 480px;
        }
        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }
        .hero-visual {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .hero-card-stack {
            position: relative;
            width: 100%;
            max-width: 420px;
            aspect-ratio: 4/3;
        }
        .hero-card-stack .stack-card {
            position: absolute;
            background: rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(6px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 16px;
            padding: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        }
        .hero-card-stack .stack-card:nth-child(1) {
            top: 0;
            right: 0;
            width: 75%;
            z-index: 3;
            background: rgba(255, 255, 255, 0.12);
        }
        .hero-card-stack .stack-card:nth-child(2) {
            top: 28px;
            right: 28px;
            width: 68%;
            z-index: 2;
            background: rgba(255, 255, 255, 0.07);
        }
        .hero-card-stack .stack-card:nth-child(3) {
            top: 54px;
            right: 54px;
            width: 60%;
            z-index: 1;
            background: rgba(255, 255, 255, 0.04);
        }
        .stack-card .card-dot {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            margin-right: 6px;
        }
        .stack-card .card-dot.green {
            background: #10b981;
        }
        .stack-card .card-dot.blue {
            background: #3b82f6;
        }
        .stack-card .card-line {
            height: 6px;
            border-radius: 3px;
            background: rgba(255, 255, 255, 0.2);
            margin: 8px 0;
            width: 70%;
        }
        .stack-card .card-line.short {
            width: 40%;
        }

        /* Section Common */
        .section {
            padding: 64px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 44px;
        }
        .section-header .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--color-primary);
            background: var(--color-primary-light);
            padding: 5px 14px;
            border-radius: 20px;
            margin-bottom: 10px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-text-main);
            margin-bottom: 8px;
        }
        .section-header p {
            font-size: 1rem;
            color: var(--color-text-soft);
            max-width: 560px;
            margin: 0 auto;
        }

        /* Feature Grid */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--color-card-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: #cbd5e1;
        }
        .feature-card .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.35rem;
            margin-bottom: 16px;
            color: #fff;
        }
        .feature-card .feature-icon.blue {
            background: linear-gradient(135deg, #3b82f6, #1d4ed8);
        }
        .feature-card .feature-icon.teal {
            background: linear-gradient(135deg, #14b8a6, #0d9488);
        }
        .feature-card .feature-icon.purple {
            background: linear-gradient(135deg, #8b5cf6, #6d28d9);
        }
        .feature-card .feature-icon.amber {
            background: linear-gradient(135deg, #f59e0b, #d97706);
        }
        .feature-card .feature-icon.rose {
            background: linear-gradient(135deg, #f43f5e, #be123c);
        }
        .feature-card .feature-icon.cyan {
            background: linear-gradient(135deg, #06b6d4, #0e7490);
        }
        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--color-text-main);
            margin-bottom: 6px;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--color-text-soft);
            line-height: 1.6;
        }

        /* Category Entry */
        .category-entry-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
            max-width: 700px;
            margin: 0 auto;
        }
        .category-card {
            display: flex;
            align-items: center;
            gap: 20px;
            background: var(--color-card-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 20px 24px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
            cursor: pointer;
        }
        .category-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
            border-color: var(--color-primary);
        }
        .category-card .cat-thumb {
            width: 80px;
            height: 80px;
            border-radius: 10px;
            object-fit: cover;
            flex-shrink: 0;
        }
        .category-card .cat-info h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--color-text-main);
            margin-bottom: 4px;
        }
        .category-card .cat-info p {
            font-size: 0.88rem;
            color: var(--color-text-soft);
            line-height: 1.5;
        }
        .category-card .cat-arrow {
            margin-left: auto;
            font-size: 1.2rem;
            color: var(--color-text-muted);
            transition: all var(--transition-base);
        }
        .category-card:hover .cat-arrow {
            color: var(--color-primary);
            transform: translateX(4px);
        }

        /* Stats Dashboard */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-card {
            background: var(--color-card-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 24px 20px;
            text-align: center;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .stat-card .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--color-primary);
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .stat-card .stat-label {
            font-size: 0.88rem;
            color: var(--color-text-soft);
            font-weight: 500;
        }
        .stat-card .stat-icon {
            font-size: 1.5rem;
            margin-bottom: 8px;
            color: var(--color-accent);
        }

        /* News List */
        .news-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .news-card {
            background: var(--color-card-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .news-card .news-thumb {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .news-card .news-body {
            padding: 18px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card .news-tag {
            display: inline-block;
            font-size: 0.78rem;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: var(--radius-tag);
            margin-bottom: 8px;
            width: fit-content;
            background: var(--color-primary-light);
            color: var(--color-primary);
        }
        .news-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--color-text-main);
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .news-card p {
            font-size: 0.88rem;
            color: var(--color-text-soft);
            line-height: 1.5;
            flex: 1;
            margin-bottom: 10px;
        }
        .news-card .news-meta {
            font-size: 0.8rem;
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 40px;
            color: var(--color-text-soft);
            font-size: 0.95rem;
            background: var(--color-card-bg);
            border-radius: var(--radius-card);
            border: 1px dashed var(--color-border);
        }

        /* FAQ */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--color-card-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
        }
        .faq-item:hover {
            border-color: #cbd5e1;
        }
        .faq-question {
            padding: 18px 22px;
            font-weight: 700;
            font-size: 1rem;
            color: var(--color-text-main);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            user-select: none;
        }
        .faq-question .faq-icon {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            transition: transform var(--transition-base);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(180deg);
            color: var(--color-primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 22px;
            font-size: 0.9rem;
            color: var(--color-text-soft);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 200px;
            padding: 0 22px 18px;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, #1a56db 0%, #1e40af 50%, #1e3a5f 100%);
            padding: 64px 0;
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.12;
            pointer-events: none;
        }
        .cta-inner {
            position: relative;
            z-index: 2;
        }
        .cta-inner h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-inner p {
            font-size: 1.05rem;
            color: #cbd5e1;
            margin-bottom: 28px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        /* Footer */
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 40px 0 30px;
            font-size: 0.9rem;
        }
        .footer-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            padding-bottom: 28px;
            margin-bottom: 20px;
        }
        .footer-brand {
            font-size: 1.15rem;
            font-weight: 700;
            color: #e2e8f0;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            list-style: none;
        }
        .footer-links a {
            color: #94a3b8;
            transition: color var(--transition-base);
            font-size: 0.88rem;
        }
        .footer-links a:hover {
            color: #e2e8f0;
        }
        .footer-bottom {
            text-align: center;
            font-size: 0.82rem;
            color: #64748b;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hero-inner {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-text p {
                max-width: 100%;
                margin-left: auto;
                margin-right: auto;
            }
            .hero-buttons {
                justify-content: center;
            }
            .hero-visual {
                display: none;
            }
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .news-list {
                grid-template-columns: 1fr;
            }
            .section {
                padding: 48px 0;
            }
            .section-header h2 {
                font-size: 1.7rem;
            }
            .hero-text h1 {
                font-size: 2.2rem;
            }
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }
        @media (max-width: 768px) {
            .header-nav {
                display: none;
            }
            .header-cta .btn-outline {
                display: none;
            }
            .header-inner {
                height: 52px;
            }
            .header-logo {
                font-size: 1.15rem;
            }
            .header-logo .logo-icon {
                width: 28px;
                height: 28px;
                font-size: 0.85rem;
                border-radius: 6px;
            }
            .mobile-bottom-nav {
                display: block;
            }
            body {
                padding-bottom: 75px;
            }
            .hero-section {
                padding: 50px 0 60px;
            }
            .hero-text h1 {
                font-size: 1.8rem;
            }
            .hero-text p {
                font-size: 0.95rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .stat-card .stat-number {
                font-size: 1.7rem;
            }
            .news-list {
                grid-template-columns: 1fr;
            }
            .news-card .news-thumb {
                height: 160px;
            }
            .section {
                padding: 36px 0;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
            .category-card {
                flex-direction: column;
                text-align: center;
            }
            .category-card .cat-arrow {
                margin-left: 0;
            }
            .btn-lg {
                padding: 11px 22px;
                font-size: 0.95rem;
            }
            .cta-inner h2 {
                font-size: 1.5rem;
            }
            .footer-inner {
                flex-direction: column;
                text-align: center;
            }
            .footer-links {
                justify-content: center;
            }
        }
        @media (max-width: 520px) {
            .hero-text h1 {
                font-size: 1.5rem;
            }
            .hero-section {
                padding: 36px 0 48px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .stat-card {
                padding: 16px 12px;
            }
            .stat-card .stat-number {
                font-size: 1.4rem;
            }
            .stat-card .stat-label {
                font-size: 0.78rem;
            }
            .btn {
                padding: 8px 16px;
                font-size: 0.85rem;
            }
            .btn-lg {
                padding: 10px 20px;
                font-size: 0.9rem;
            }
            .feature-card {
                padding: 20px 16px;
            }
            .section-header h2 {
                font-size: 1.35rem;
            }
            .news-card .news-thumb {
                height: 140px;
            }
            .mobile-bottom-nav .tab-item a {
                padding: 4px 8px;
                font-size: 0.65rem;
                min-width: 44px;
            }
            .mobile-bottom-nav .tab-item a i {
                font-size: 1.1rem;
            }
        }

        /* Focus visible for accessibility */
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        /* Smooth section reveal (subtle) */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(18px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .section {
            animation: fadeInUp 0.5s ease forwards;
        }

/* roulang page: article */
:root {
            --primary: #1e3a5f;
            --primary-light: #2c5282;
            --primary-dark: #0f2440;
            --accent: #0d9488;
            --accent-light: #14b8a6;
            --accent-glow: rgba(13,148,136,0.25);
            --bg: #f5f7fa;
            --bg-card: #ffffff;
            --bg-alt: #eef1f6;
            --text: #1a202c;
            --text-secondary: #4a5568;
            --text-muted: #718096;
            --border: #e2e8f0;
            --border-light: #edf2f7;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow: 0 4px 16px rgba(0,0,0,0.07), 0 2px 6px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 32px rgba(0,0,0,0.09), 0 4px 12px rgba(0,0,0,0.05);
            --shadow-xl: 0 20px 48px rgba(0,0,0,0.11), 0 8px 20px rgba(0,0,0,0.06);
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --nav-height: 68px;
            --bottom-tab-height: 60px;
        }

        *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
        html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
        body{
            font-family:var(--font-sans);
            font-size:16px;
            line-height:1.7;
            color:var(--text);
            background:var(--bg);
            -webkit-font-smoothing:antialiased;
            -moz-osx-font-smoothing:grayscale;
            padding-bottom:0;
        }
        img{max-width:100%;height:auto;display:block}
        a{text-decoration:none;color:inherit;transition:color var(--transition)}
        button,input,select,textarea{font-family:inherit;font-size:inherit}
        ul,ol{list-style:none}
        h1,h2,h3,h4,h5,h6{line-height:1.3;font-weight:700;color:var(--text)}
        h1{font-size:2rem;letter-spacing:-0.02em}
        h2{font-size:1.6rem;letter-spacing:-0.01em}
        h3{font-size:1.25rem}
        h4{font-size:1.1rem}
        @media(min-width:768px){h1{font-size:2.5rem}h2{font-size:1.9rem}h3{font-size:1.35rem}}
        @media(min-width:1024px){h1{font-size:2.8rem}h2{font-size:2.1rem}}

        .container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 20px}
        @media(min-width:768px){.container{padding:0 32px}}
        @media(min-width:1024px){.container{padding:0 40px}}

        /* ========== HEADER ========== */
        .site-header{
            position:sticky;top:0;z-index:100;background:rgba(255,255,255,0.92);
            backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
            border-bottom:1px solid var(--border-light);
            box-shadow:var(--shadow-sm);height:var(--nav-height);
        }
        .header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;gap:20px}
        .header-logo{
            display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.2rem;
            color:var(--primary);white-space:nowrap;transition:color var(--transition);
            letter-spacing:-0.01em;
        }
        .header-logo:hover{color:var(--primary-light)}
        .logo-icon{
            display:flex;align-items:center;justify-content:center;
            width:38px;height:38px;background:linear-gradient(135deg,var(--primary),var(--primary-light));
            color:#fff;border-radius:var(--radius-sm);font-size:1rem;
            box-shadow:0 2px 8px rgba(30,58,95,0.25);
        }
        .header-nav{display:none;align-items:center;gap:6px}
        @media(min-width:768px){.header-nav{display:flex}}
        .header-nav a{
            padding:8px 16px;border-radius:var(--radius-sm);font-weight:600;font-size:0.9rem;
            color:var(--text-secondary);transition:all var(--transition);white-space:nowrap;
        }
        .header-nav a:hover{color:var(--primary);background:rgba(30,58,95,0.05)}
        .header-nav a.active{color:var(--primary);background:rgba(30,58,95,0.08);font-weight:700}
        .header-cta{display:none;align-items:center;gap:10px}
        @media(min-width:768px){.header-cta{display:flex}}

        /* ========== BUTTONS ========== */
        .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;
            border-radius:var(--radius-sm);font-weight:600;font-size:0.9rem;cursor:pointer;
            border:2px solid transparent;transition:all var(--transition);white-space:nowrap;
            line-height:1.4;letter-spacing:0.01em;
        }
        .btn:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
        .btn-sm{padding:7px 15px;font-size:0.82rem;border-radius:7px}
        .btn-lg{padding:13px 28px;font-size:1rem;border-radius:var(--radius)}
        .btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}
        .btn-primary:hover{background:var(--primary-light);border-color:var(--primary-light);transform:translateY(-1px);box-shadow:var(--shadow)}
        .btn-primary:active{transform:translateY(0);box-shadow:var(--shadow-sm)}
        .btn-outline{background:transparent;color:var(--primary);border-color:var(--border)}
        .btn-outline:hover{background:rgba(30,58,95,0.04);border-color:var(--primary);color:var(--primary)}
        .btn-accent{background:var(--accent);color:#fff;border-color:var(--accent)}
        .btn-accent:hover{background:var(--accent-light);border-color:var(--accent-light);transform:translateY(-1px);box-shadow:0 4px 16px rgba(13,148,136,0.3)}

        /* ========== ARTICLE BANNER ========== */
        .article-banner{
            position:relative;padding:56px 0 40px;
            background:linear-gradient(170deg, #1a3650 0%, #1e3a5f 40%, #1a4a3a 100%);
            overflow:hidden;
        }
        .article-banner::before{
            content:'';position:absolute;inset:0;
            background:url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity:0.15;z-index:0;
        }
        .article-banner::after{
            content:'';position:absolute;top:-80px;right:-120px;width:400px;height:400px;
            background:radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
            z-index:0;border-radius:50%;
        }
        .article-banner-content{position:relative;z-index:1}
        @media(min-width:768px){.article-banner{padding:72px 0 52px}}
        @media(min-width:1024px){.article-banner{padding:88px 0 60px}}

        /* ========== BREADCRUMB ========== */
        .breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:6px;font-size:0.85rem;color:rgba(255,255,255,0.75);margin-bottom:20px}
        .breadcrumb a{color:rgba(255,255,255,0.85);transition:color var(--transition)}
        .breadcrumb a:hover{color:#fff;text-decoration:underline}
        .breadcrumb .sep{color:rgba(255,255,255,0.45);font-size:0.7rem}
        .breadcrumb .current{color:#fff;font-weight:600}

        /* ========== ARTICLE META ========== */
        .article-meta-row{
            display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:16px;
            color:rgba(255,255,255,0.8);font-size:0.88rem;
        }
        .article-meta-row .meta-tag{
            display:inline-flex;align-items:center;gap:5px;
            padding:4px 12px;border-radius:20px;font-size:0.78rem;font-weight:600;
            background:rgba(255,255,255,0.15);color:#fff;backdrop-filter:blur(4px);
            border:1px solid rgba(255,255,255,0.2);
        }
        .article-meta-row .meta-dot{width:5px;height:5px;border-radius:50%;background:rgba(255,255,255,0.5)}

        /* ========== ARTICLE BODY ========== */
        .article-body-section{padding:48px 0}
        @media(min-width:768px){.article-body-section{padding:64px 0}}
        .article-layout{display:grid;grid-template-columns:1fr;gap:32px}
        @media(min-width:1024px){.article-layout{grid-template-columns:1fr 300px;gap:40px}}
        .article-main{min-width:0}
        .article-content{
            background:var(--bg-card);border-radius:var(--radius-lg);
            padding:28px 22px;box-shadow:var(--shadow);border:1px solid var(--border-light);
            line-height:1.85;font-size:1.02rem;color:var(--text);
        }
        @media(min-width:768px){.article-content{padding:36px 32px}}
        @media(min-width:1024px){.article-content{padding:44px 40px}}
        .article-content h2{margin-top:32px;margin-bottom:16px;font-size:1.5rem;color:var(--primary)}
        .article-content h3{margin-top:24px;margin-bottom:12px;font-size:1.2rem;color:var(--text)}
        .article-content p{margin-bottom:16px}
        .article-content ul,.article-content ol{margin-bottom:16px;padding-left:24px}
        .article-content ul{list-style:disc}
        .article-content ol{list-style:decimal}
        .article-content li{margin-bottom:8px}
        .article-content img{border-radius:var(--radius);margin:20px 0}
        .article-content blockquote{
            border-left:4px solid var(--accent);padding:12px 18px;margin:20px 0;
            background:var(--bg-alt);border-radius:0 var(--radius-sm) var(--radius-sm) 0;
            color:var(--text-secondary);font-style:italic;
        }
        .article-content code{background:var(--bg-alt);padding:2px 8px;border-radius:4px;font-size:0.9em}
        .article-content pre{background:#1a202c;color:#e2e8f0;padding:20px;border-radius:var(--radius);overflow-x:auto;margin:20px 0}

        /* ========== ARTICLE SIDEBAR ========== */
        .article-sidebar{display:flex;flex-direction:column;gap:24px}
        .sidebar-card{
            background:var(--bg-card);border-radius:var(--radius);padding:22px 20px;
            box-shadow:var(--shadow-sm);border:1px solid var(--border-light);
            transition:box-shadow var(--transition);
        }
        .sidebar-card:hover{box-shadow:var(--shadow)}
        .sidebar-card h4{font-size:1rem;margin-bottom:14px;color:var(--primary);display:flex;align-items:center;gap:8px}
        .sidebar-tags{display:flex;flex-wrap:wrap;gap:8px}
        .sidebar-tags .tag{
            padding:5px 12px;border-radius:20px;font-size:0.78rem;font-weight:600;
            background:var(--bg-alt);color:var(--text-secondary);border:1px solid var(--border);
            transition:all var(--transition);cursor:pointer;
        }
        .sidebar-tags .tag:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

        /* ========== RELATED POSTS ========== */
        .related-section{padding:48px 0 56px;background:var(--bg-alt)}
        @media(min-width:768px){.related-section{padding:64px 0 72px}}
        .related-grid{display:grid;grid-template-columns:1fr;gap:20px}
        @media(min-width:520px){.related-grid{grid-template-columns:repeat(2,1fr)}}
        @media(min-width:1024px){.related-grid{grid-template-columns:repeat(4,1fr);gap:24px}}
        .related-card{
            background:var(--bg-card);border-radius:var(--radius);overflow:hidden;
            box-shadow:var(--shadow-sm);border:1px solid var(--border-light);
            transition:all var(--transition-slow);display:flex;flex-direction:column;
        }
        .related-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
        .related-card-img{width:100%;aspect-ratio:16/10;overflow:hidden;background:var(--bg-alt)}
        .related-card-img img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-slow)}
        .related-card:hover .related-card-img img{transform:scale(1.06)}
        .related-card-body{padding:16px;flex:1;display:flex;flex-direction:column;gap:8px}
        .related-card-body h5{font-size:0.95rem;font-weight:700;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
        .related-card-body h5 a{color:var(--text);transition:color var(--transition)}
        .related-card-body h5 a:hover{color:var(--primary)}
        .related-card-meta{font-size:0.78rem;color:var(--text-muted);display:flex;align-items:center;gap:8px}

        /* ========== CTA SECTION ========== */
        .cta-section{padding:56px 0;background:var(--bg-card);border-top:1px solid var(--border-light)}
        @media(min-width:768px){.cta-section{padding:72px 0}}
        .cta-card{
            background:linear-gradient(135deg,var(--primary),var(--primary-dark));
            border-radius:var(--radius-xl);padding:36px 24px;text-align:center;
            color:#fff;box-shadow:var(--shadow-xl);
            position:relative;overflow:hidden;
        }
        @media(min-width:768px){.cta-card{padding:48px 40px}}
        .cta-card::before{
            content:'';position:absolute;top:-60px;right:-80px;width:280px;height:280px;
            background:radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
            border-radius:50%;z-index:0;
        }
        .cta-card>*{position:relative;z-index:1}
        .cta-card h2{color:#fff;margin-bottom:12px}
        .cta-card p{color:rgba(255,255,255,0.8);margin-bottom:24px;max-width:600px;margin-left:auto;margin-right:auto}
        .cta-card .btn-group{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}

        /* ========== NOT FOUND ========== */
        .notfound-section{padding:80px 0;text-align:center}
        .notfound-section .icon-wrap{font-size:3.5rem;color:var(--text-muted);margin-bottom:20px}
        .notfound-section h2{margin-bottom:12px}
        .notfound-section p{color:var(--text-secondary);margin-bottom:28px;max-width:500px;margin-left:auto;margin-right:auto}

        /* ========== FOOTER ========== */
        .site-footer{
            background:var(--primary-dark);color:rgba(255,255,255,0.75);padding:40px 0 28px;
            border-top:4px solid var(--accent);
        }
        @media(min-width:768px){.site-footer{padding:52px 0 32px}}
        .footer-inner{
            display:flex;flex-direction:column;align-items:center;gap:20px;
            margin-bottom:24px;text-align:center;
        }
        @media(min-width:768px){.footer-inner{flex-direction:row;justify-content:space-between;text-align:left}}
        .footer-brand{font-size:1.3rem;font-weight:800;color:#fff;letter-spacing:-0.01em}
        .footer-links{display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:center}
        .footer-links a{color:rgba(255,255,255,0.7);font-size:0.88rem;transition:color var(--transition)}
        .footer-links a:hover{color:#fff}
        .footer-bottom{border-top:1px solid rgba(255,255,255,0.12);padding-top:20px;text-align:center}
        .footer-bottom p{font-size:0.8rem;color:rgba(255,255,255,0.5);line-height:1.6}

        /* ========== MOBILE BOTTOM TAB ========== */
        .mobile-bottom-tabs{
            display:flex;position:fixed;bottom:0;left:0;right:0;z-index:99;
            background:rgba(255,255,255,0.94);backdrop-filter:blur(16px);
            -webkit-backdrop-filter:blur(16px);
            border-top:1px solid var(--border);box-shadow:0 -2px 16px rgba(0,0,0,0.06);
            height:var(--bottom-tab-height);padding:0 8px;
        }
        @media(min-width:768px){.mobile-bottom-tabs{display:none}}
        .mobile-bottom-tabs a{
            flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
            gap:3px;font-size:0.7rem;font-weight:600;color:var(--text-muted);
            transition:all var(--transition);border-radius:var(--radius-sm);
            position:relative;padding:4px 2px;
        }
        .mobile-bottom-tabs a i{font-size:1.15rem;transition:color var(--transition)}
        .mobile-bottom-tabs a.active{color:var(--primary)}
        .mobile-bottom-tabs a.active i{color:var(--primary)}
        .mobile-bottom-tabs a.active::after{
            content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);
            width:24px;height:3px;background:var(--primary);border-radius:0 0 3px 3px;
        }
        .mobile-bottom-tabs a:hover{color:var(--primary)}
        body.has-bottom-tabs{padding-bottom:var(--bottom-tab-height)}

        /* ========== UTILITIES ========== */
        .section-label{
            display:inline-flex;align-items:center;gap:6px;padding:5px 14px;
            border-radius:20px;font-size:0.8rem;font-weight:700;letter-spacing:0.03em;
            text-transform:uppercase;margin-bottom:12px;
        }
        .section-label.primary{background:rgba(30,58,95,0.08);color:var(--primary)}
        .section-label.accent{background:rgba(13,148,136,0.1);color:var(--accent)}
        .section-header{margin-bottom:32px;text-align:center}
        @media(min-width:768px){.section-header{margin-bottom:40px}}
        .section-header h2{margin-bottom:8px}
        .section-header p{color:var(--text-secondary);max-width:600px;margin:0 auto}
        .divider{width:50px;height:4px;background:var(--accent);border-radius:2px;margin:0 auto 12px}
        .text-gradient{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
        .sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

        @media(max-width:767px){
            .article-banner h1{font-size:1.55rem}
            .article-content{font-size:0.95rem;padding:20px 16px}
        }
        @media(max-width:519px){
            .related-grid{grid-template-columns:1fr}
            .article-meta-row{font-size:0.8rem}
            .cta-card{padding:28px 16px}
        }

/* roulang page: category1 */
:root {
            --primary: #1e40af;
            --primary-light: #2563eb;
            --primary-dark: #1a3596;
            --accent: #0ea5e9;
            --accent-light: #38bdf8;
            --success: #10b981;
            --success-light: #d1fae5;
            --warning: #f59e0b;
            --warning-light: #fef3c7;
            --danger: #ef4444;
            --danger-light: #fee2e2;
            --bg: #f1f5f9;
            --bg-alt: #e2e8f0;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-dark-card: #1e293b;
            --text-primary: #1e293b;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-inverse: #f8fafc;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow: 0 4px 16px rgba(0, 0, 0, 0.07), 0 2px 6px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.10), 0 4px 10px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12), 0 6px 16px rgba(0, 0, 0, 0.06);
            --shadow-xl: 0 24px 56px rgba(0, 0, 0, 0.16), 0 8px 20px rgba(0, 0, 0, 0.08);
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', monospace;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            --header-height: 72px;
            --bottom-tab-height: 64px;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: calc(var(--header-height) + 24px);
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg);
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            min-height: 100vh;
        }

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

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

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        .container-narrow {
            max-width: 960px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* ========== HEADER ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1040;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            width: 100%;
            flex-wrap: nowrap;
        }

        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary-dark);
            white-space: nowrap;
            text-decoration: none;
            letter-spacing: -0.01em;
            transition: opacity var(--transition-fast);
        }

        .header-logo:hover {
            color: var(--primary-dark);
            opacity: 0.85;
        }

        .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .header-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: nowrap;
        }

        .header-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .header-nav a:hover {
            color: var(--primary);
            background: rgba(30, 64, 175, 0.05);
        }

        .header-nav a.active {
            color: var(--primary);
            background: rgba(30, 64, 175, 0.08);
            font-weight: 600;
        }

        .header-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 18px;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
        }

        .header-cta {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        /* ========== BUTTONS ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: 24px;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
            white-space: nowrap;
            line-height: 1.4;
            letter-spacing: 0.01em;
        }

        .btn:focus-visible {
            outline: 3px solid rgba(30, 64, 175, 0.4);
            outline-offset: 2px;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            box-shadow: 0 4px 14px rgba(30, 64, 175, 0.28);
        }

        .btn-primary:hover {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            box-shadow: 0 6px 20px rgba(30, 64, 175, 0.38);
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(30, 64, 175, 0.2);
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--border);
            box-shadow: none;
        }

        .btn-outline:hover {
            border-color: var(--primary);
            background: rgba(30, 64, 175, 0.04);
            color: var(--primary);
            transform: translateY(-1px);
        }

        .btn-outline:active {
            transform: translateY(0);
        }

        .btn-sm {
            padding: 7px 16px;
            font-size: 0.875rem;
            border-radius: 20px;
        }

        .btn-lg {
            padding: 14px 32px;
            font-size: 1.05rem;
            border-radius: 28px;
        }

        .btn-accent {
            background: linear-gradient(135deg, var(--accent), var(--accent-light));
            color: #fff;
            box-shadow: 0 4px 14px rgba(14, 165, 233, 0.28);
        }

        .btn-accent:hover {
            box-shadow: 0 6px 20px rgba(14, 165, 233, 0.38);
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-success {
            background: var(--success);
            color: #fff;
            box-shadow: 0 4px 14px rgba(16, 185, 129, 0.28);
        }

        .btn-success:hover {
            box-shadow: 0 6px 20px rgba(16, 185, 129, 0.38);
            transform: translateY(-2px);
            color: #fff;
        }

        /* ========== BREADCRUMB ========== */
        .breadcrumb-section {
            padding: 16px 0;
            background: transparent;
        }

        .breadcrumb-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.875rem;
            color: var(--text-muted);
            flex-wrap: wrap;
        }

        .breadcrumb-nav a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color var(--transition-fast);
        }

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

        .breadcrumb-nav .separator {
            color: var(--text-muted);
            font-size: 0.7rem;
        }

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

        /* ========== CATEGORY BANNER ========== */
        .category-banner {
            position: relative;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            padding: 80px 0;
            border-radius: var(--radius-xl);
            overflow: hidden;
            margin-bottom: 48px;
        }

        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88), rgba(30, 64, 175, 0.78), rgba(14, 165, 233, 0.55));
            z-index: 1;
        }

        .category-banner .banner-content {
            position: relative;
            z-index: 2;
            text-align: center;
            color: #fff;
        }

        .category-banner .banner-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 72px;
            height: 72px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(10px);
            border: 2px solid rgba(255, 255, 255, 0.25);
            font-size: 1.8rem;
            margin-bottom: 20px;
            color: #fff;
        }

        .category-banner h1 {
            font-size: 2.4rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
            line-height: 1.25;
        }

        .category-banner .banner-desc {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }

        .category-banner .banner-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin-top: 32px;
            flex-wrap: wrap;
        }

        .category-banner .banner-stat {
            text-align: center;
        }

        .category-banner .banner-stat-value {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.01em;
        }

        .category-banner .banner-stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 4px;
        }

        /* ========== SECTION TITLES ========== */
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--accent);
            background: rgba(14, 165, 233, 0.08);
            padding: 5px 14px;
            border-radius: 20px;
            margin-bottom: 8px;
        }

        .section-title {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.3;
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.6;
            max-width: 650px;
        }

        .section-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .section-header.text-start {
            text-align: left;
        }

        /* ========== STEP CARDS ========== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 20px;
            margin-bottom: 56px;
        }

        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 20px 20px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
            text-align: center;
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }

        .step-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--accent);
        }

        .step-card .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            margin-bottom: 16px;
            box-shadow: 0 4px 12px rgba(30, 64, 175, 0.25);
        }

        .step-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .step-card p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.5;
            margin: 0;
        }

        .step-card .step-icon-check {
            position: absolute;
            top: 10px;
            right: 14px;
            color: var(--success);
            font-size: 0.85rem;
            opacity: 0;
            transition: opacity var(--transition);
        }

        .step-card:hover .step-icon-check {
            opacity: 1;
        }

        /* ========== DASHBOARD CARDS ========== */
        .dashboard-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-bottom: 56px;
        }

        .dash-card {
            background: var(--bg-dark-card);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            color: var(--text-inverse);
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: all var(--transition);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        .dash-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }

        .dash-card .dash-icon {
            font-size: 1.5rem;
            color: var(--accent-light);
            margin-bottom: 12px;
        }

        .dash-card .dash-value {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1;
            margin-bottom: 6px;
        }

        .dash-card .dash-label {
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.65);
        }

        .dash-card .dash-trend {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--success);
            margin-top: 8px;
        }

        .dash-card.dash-accent {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            border-color: rgba(255, 255, 255, 0.15);
        }

        .dash-card.dash-accent .dash-icon {
            color: rgba(255, 255, 255, 0.8);
        }

        /* ========== ARTICLE CARDS ========== */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-bottom: 56px;
        }

        .article-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

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

        .article-card .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
            background: var(--bg-alt);
        }

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

        .article-card:hover .card-img-wrap img {
            transform: scale(1.06);
        }

        .article-card .card-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 4px 12px;
            border-radius: 14px;
            font-size: 0.75rem;
            font-weight: 700;
            background: var(--primary);
            color: #fff;
            z-index: 2;
        }

        .article-card .card-body {
            padding: 18px 20px 14px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .article-card .card-body h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .article-card .card-body p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.55;
            margin-bottom: 12px;
            flex: 1;
        }

        .article-card .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .article-card .card-meta i {
            font-size: 0.7rem;
        }

        /* ========== INTEGRATION SECTION ========== */
        .integration-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin-bottom: 56px;
        }

        .integration-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 20px 16px;
            text-align: center;
            border: 2px solid var(--border-light);
            transition: all var(--transition);
            cursor: pointer;
            box-shadow: var(--shadow-sm);
        }

        .integration-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .integration-item .integration-icon {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 10px;
        }

        .integration-item h5 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 4px;
        }

        .integration-item p {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin: 0;
        }

        /* ========== FAQ ========== */
        .faq-section {
            margin-bottom: 56px;
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            margin-bottom: 12px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            box-shadow: var(--shadow);
        }

        .faq-question {
            padding: 18px 24px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
            user-select: none;
            transition: background var(--transition-fast);
        }

        .faq-question:hover {
            background: rgba(14, 165, 233, 0.03);
        }

        .faq-question .faq-icon {
            transition: transform var(--transition);
            color: var(--text-muted);
            font-size: 0.85rem;
            flex-shrink: 0;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
            padding: 0 24px;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        .faq-answer p {
            font-size: 0.925rem;
            color: var(--text-secondary);
            line-height: 1.65;
            margin: 0;
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--bg-dark), var(--primary-dark));
            border-radius: var(--radius-xl);
            padding: 56px 40px;
            text-align: center;
            color: #fff;
            margin-bottom: 56px;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -40px;
            width: 140px;
            height: 140px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            pointer-events: none;
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }

        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 550px;
            margin: 0 auto 28px;
            position: relative;
            z-index: 1;
            line-height: 1.6;
        }

        .cta-section .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 40px 0 28px;
            margin-top: 20px;
        }

        .footer-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 20px;
            margin-bottom: 24px;
        }

        .footer-brand {
            font-size: 1.15rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.01em;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            font-size: 0.9rem;
            transition: color var(--transition-fast);
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 0.825rem;
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.6;
        }

        .footer-bottom p {
            margin: 0;
        }

        /* ========== BOTTOM TAB NAV (MOBILE) ========== */
        .bottom-tab-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-top: 1px solid var(--border);
            box-shadow: 0 -2px 16px rgba(0, 0, 0, 0.06);
            height: var(--bottom-tab-height);
        }

        .bottom-tab-inner {
            display: flex;
            align-items: center;
            justify-content: space-around;
            height: 100%;
            padding: 0 8px;
        }

        .bottom-tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--text-muted);
            text-decoration: none;
            padding: 6px 12px;
            border-radius: 12px;
            transition: all var(--transition-fast);
            position: relative;
            min-width: 56px;
        }

        .bottom-tab-item i {
            font-size: 1.2rem;
            transition: color var(--transition-fast);
        }

        .bottom-tab-item:hover {
            color: var(--text-secondary);
        }

        .bottom-tab-item.active {
            color: var(--primary);
            font-weight: 700;
        }

        .bottom-tab-item.active::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .steps-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .dashboard-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .articles-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .integration-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .category-banner h1 {
                font-size: 2rem;
            }
            .category-banner .banner-stats {
                gap: 24px;
            }
            .header-nav a {
                padding: 6px 12px;
                font-size: 0.875rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 60px;
            }
            .header-cta {
                display: none;
            }
            .header-nav {
                gap: 4px;
            }
            .header-nav a {
                padding: 5px 10px;
                font-size: 0.8rem;
                border-radius: 16px;
            }
            .header-nav a.active::after {
                bottom: 2px;
                width: 14px;
                height: 2px;
            }
            .header-logo {
                font-size: 1.05rem;
                gap: 6px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 0.9rem;
                border-radius: 6px;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .dashboard-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .articles-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .integration-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .category-banner {
                padding: 48px 16px;
                border-radius: var(--radius-lg);
            }
            .category-banner h1 {
                font-size: 1.6rem;
            }
            .category-banner .banner-desc {
                font-size: 0.95rem;
            }
            .category-banner .banner-stats {
                gap: 16px;
            }
            .category-banner .banner-stat-value {
                font-size: 1.4rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .cta-section {
                padding: 36px 20px;
                border-radius: var(--radius-lg);
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .bottom-tab-nav {
                display: block;
            }
            body {
                padding-bottom: calc(var(--bottom-tab-height) + 12px);
            }
            .site-footer {
                padding-bottom: calc(var(--bottom-tab-height) + 20px);
            }
            .dash-card .dash-value {
                font-size: 1.5rem;
            }
            .step-card {
                padding: 20px 14px 14px;
            }
            .step-card h4 {
                font-size: 0.95rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 14px;
                padding-right: 14px;
            }
            .container-narrow {
                padding-left: 14px;
                padding-right: 14px;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .dashboard-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .articles-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .integration-grid {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .category-banner {
                padding: 36px 12px;
                border-radius: var(--radius);
                margin-bottom: 32px;
            }
            .category-banner h1 {
                font-size: 1.35rem;
            }
            .category-banner .banner-desc {
                font-size: 0.85rem;
            }
            .category-banner .banner-stats {
                gap: 12px;
                margin-top: 20px;
            }
            .category-banner .banner-stat-value {
                font-size: 1.2rem;
            }
            .category-banner .banner-stat-label {
                font-size: 0.75rem;
            }
            .category-banner .banner-icon {
                width: 52px;
                height: 52px;
                font-size: 1.3rem;
                margin-bottom: 14px;
            }
            .section-title {
                font-size: 1.25rem;
            }
            .section-subtitle {
                font-size: 0.875rem;
            }
            .cta-section {
                padding: 28px 16px;
                border-radius: var(--radius);
                margin-bottom: 36px;
            }
            .cta-section h2 {
                font-size: 1.3rem;
            }
            .cta-section p {
                font-size: 0.875rem;
            }
            .btn-lg {
                padding: 10px 24px;
                font-size: 0.95rem;
            }
            .header-nav a {
                padding: 4px 8px;
                font-size: 0.75rem;
            }
            .header-logo {
                font-size: 0.95rem;
            }
            .logo-icon {
                width: 28px;
                height: 28px;
                font-size: 0.8rem;
            }
            .dash-card {
                padding: 16px 14px;
            }
            .dash-card .dash-value {
                font-size: 1.3rem;
            }
            .dash-card .dash-label {
                font-size: 0.78rem;
            }
            .footer-inner {
                flex-direction: column;
                text-align: center;
                gap: 14px;
            }
            .footer-links {
                justify-content: center;
                gap: 14px;
            }
            .bottom-tab-item {
                font-size: 0.65rem;
                padding: 4px 8px;
                min-width: 44px;
            }
            .bottom-tab-item i {
                font-size: 1.05rem;
            }
        }