/* roulang page: index */
:root {
            --color-primary: #1a56db;
            --color-primary-dark: #1040b0;
            --color-primary-light: #3b82f6;
            --color-accent: #f97316;
            --color-accent-dark: #ea580c;
            --color-surface: #f8fafc;
            --color-surface-alt: #f1f5f9;
            --color-muted: #64748b;
            --color-text-main: #1e293b;
            --color-text-soft: #475569;
            --color-border: #e2e8f0;
            --radius-xl: 1rem;
            --radius-2xl: 1.25rem;
            --radius-3xl: 1.75rem;
            --shadow-card: 0 1px 3px 0 rgba(0,0,0,0.06), 0 4px 16px -4px rgba(0,0,0,0.08);
            --shadow-card-hover: 0 2px 6px 0 rgba(0,0,0,0.08), 0 8px 28px -4px rgba(0,0,0,0.12);
        }
        *, *::before, *::after { box-sizing: border-box; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
        body {
            margin: 0;
            padding: 0;
            font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            line-height: 1.65;
            color: var(--color-text-main);
            background-color: #ffffff;
            min-height: 100vh;
        }
        a { color: inherit; text-decoration: none; transition: color 0.2s ease; }
        img { max-width: 100%; height: auto; display: block; }
        button, input { font-family: inherit; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
        @media (max-width: 768px) {
            .container { padding: 0 1rem; }
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: #ffffff;
            box-shadow: var(--shadow-card);
            border-bottom: 1px solid var(--color-border);
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0.75rem 0;
            border-bottom: 1px solid #f1f5f9;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--color-primary);
            letter-spacing: -0.02em;
            white-space: nowrap;
        }
        .logo-link i { font-size: 1.5rem; color: var(--color-accent); }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .search-mini {
            display: flex;
            align-items: center;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: 2rem;
            padding: 0.5rem 1rem;
            gap: 0.5rem;
            transition: all 0.2s ease;
        }
        .search-mini:focus-within {
            border-color: var(--color-primary-light);
            box-shadow: 0 0 0 3px rgba(26,86,219,0.08);
            background: #fff;
        }
        .search-mini input {
            border: none;
            outline: none;
            background: transparent;
            font-size: 0.875rem;
            color: var(--color-text-main);
            width: 140px;
        }
        .search-mini input::placeholder { color: var(--color-muted); }
        .search-mini button {
            background: none;
            border: none;
            cursor: pointer;
            color: var(--color-muted);
            padding: 0;
            font-size: 0.9rem;
            transition: color 0.2s;
        }
        .search-mini button:hover { color: var(--color-primary); }
        .btn-cta-sm {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: var(--color-accent);
            color: #fff;
            padding: 0.55rem 1.25rem;
            border-radius: 2rem;
            font-weight: 600;
            font-size: 0.875rem;
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            white-space: nowrap;
            box-shadow: 0 2px 8px -2px rgba(249,115,22,0.35);
        }
        .btn-cta-sm:hover {
            background: var(--color-accent-dark);
            transform: translateY(-1px);
            box-shadow: 0 4px 16px -2px rgba(249,115,22,0.45);
        }
        .nav-tabs-row {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            padding: 0.5rem 0;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }
        .nav-tabs-row::-webkit-scrollbar { display: none; }
        .nav-tab {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            padding: 0.6rem 1.25rem;
            border-radius: 2rem;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--color-text-soft);
            transition: all 0.2s ease;
            white-space: nowrap;
            cursor: pointer;
            border: 1px solid transparent;
            background: transparent;
        }
        .nav-tab:hover {
            color: var(--color-primary);
            background: #eff6ff;
        }
        .nav-tab.active {
            color: #fff;
            background: var(--color-primary);
            border-color: var(--color-primary);
            box-shadow: 0 2px 8px -2px rgba(26,86,219,0.35);
        }
        .nav-tab i { font-size: 0.8rem; }

        /* Mobile nav */
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1.5rem;
            color: var(--color-text-main);
            padding: 0.4rem;
        }
        @media (max-width: 768px) {
            .mobile-menu-toggle { display: block; }
            .header-actions .search-mini { display: none; }
            .header-actions .btn-cta-sm { padding: 0.45rem 1rem; font-size: 0.8rem; }
            .nav-tabs-row {
                gap: 0.15rem;
                padding: 0.35rem 0;
            }
            .nav-tab {
                padding: 0.5rem 0.9rem;
                font-size: 0.8rem;
                border-radius: 1.5rem;
            }
            .logo-link { font-size: 1.15rem; }
        }
        @media (max-width: 520px) {
            .header-top { padding: 0.6rem 0; }
            .logo-link { font-size: 1.05rem; }
            .logo-link i { font-size: 1.2rem; }
            .btn-cta-sm { padding: 0.4rem 0.85rem; font-size: 0.75rem; }
            .nav-tab { padding: 0.4rem 0.7rem; font-size: 0.75rem; border-radius: 1.25rem; }
        }

        /* Hero */
        .hero-section {
            position: relative;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            min-height: 560px;
            display: flex;
            align-items: center;
            border-radius: 0 0 2.5rem 2.5rem;
            overflow: hidden;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26,86,219,0.88) 0%, rgba(16,64,176,0.82) 40%, rgba(0,0,0,0.55) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 680px;
            padding: 3rem 0;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(255,255,255,0.18);
            backdrop-filter: blur(8px);
            color: #fff;
            padding: 0.4rem 1.2rem;
            border-radius: 2rem;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            margin-bottom: 1.25rem;
            border: 1px solid rgba(255,255,255,0.25);
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 900;
            line-height: 1.15;
            color: #fff;
            margin: 0 0 1.25rem;
            letter-spacing: -0.03em;
        }
        .hero-desc {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.9);
            line-height: 1.7;
            margin: 0 0 2rem;
            max-width: 520px;
        }
        .hero-btns {
            display: flex;
            flex-wrap: wrap;
            gap: 0.85rem;
        }
        .btn-hero-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: #fff;
            color: var(--color-primary);
            padding: 0.85rem 2rem;
            border-radius: 2.5rem;
            font-weight: 700;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 6px 24px -4px rgba(0,0,0,0.25);
        }
        .btn-hero-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 32px -4px rgba(0,0,0,0.3);
            background: #f8fafc;
        }
        .btn-hero-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: transparent;
            color: #fff;
            padding: 0.85rem 2rem;
            border-radius: 2.5rem;
            font-weight: 700;
            font-size: 1rem;
            border: 2px solid rgba(255,255,255,0.55);
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .btn-hero-outline:hover {
            background: rgba(255,255,255,0.1);
            border-color: #fff;
        }
        @media (max-width: 768px) {
            .hero-section { min-height: 440px; border-radius: 0 0 1.75rem 1.75rem; }
            .hero-title { font-size: 2.2rem; }
            .hero-desc { font-size: 1rem; }
            .hero-content { padding: 2rem 0; }
        }
        @media (max-width: 520px) {
            .hero-section { min-height: 380px; border-radius: 0 0 1.25rem 1.25rem; }
            .hero-title { font-size: 1.7rem; }
            .hero-desc { font-size: 0.9rem; }
            .btn-hero-primary, .btn-hero-outline { padding: 0.7rem 1.4rem; font-size: 0.9rem; }
        }

        /* Section */
        .section { padding: 4.5rem 0; }
        .section-header { text-align: center; margin-bottom: 3rem; }
        .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.06em;
            text-transform: uppercase;
            margin-bottom: 0.5rem;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--color-text-main);
            margin: 0 0 0.75rem;
            letter-spacing: -0.02em;
            line-height: 1.25;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-muted);
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .section { padding: 3rem 0; }
            .section-title { font-size: 1.7rem; }
            .section-subtitle { font-size: 0.95rem; }
        }

        /* Cards */
        .card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem; }
        .card {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-2xl);
            overflow: hidden;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
            border-color: #cbd5e1;
        }
        .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
            background: #e2e8f0;
        }
        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .card:hover .card-img-wrap img { transform: scale(1.04); }
        .card-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
        .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--color-primary);
            background: #eff6ff;
            padding: 0.25rem 0.75rem;
            border-radius: 1rem;
            margin-bottom: 0.75rem;
            letter-spacing: 0.03em;
            align-self: flex-start;
        }
        .card-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--color-text-main);
            margin: 0 0 0.5rem;
            line-height: 1.4;
        }
        .card-desc {
            font-size: 0.9rem;
            color: var(--color-muted);
            line-height: 1.6;
            margin: 0 0 1rem;
            flex: 1;
        }
        .card-meta {
            font-size: 0.8rem;
            color: #94a3b8;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--color-primary);
            transition: gap 0.2s ease;
            margin-top: auto;
        }
        .card-link:hover { gap: 0.6rem; color: var(--color-primary-dark); }
        @media (max-width: 768px) {
            .card-grid { grid-template-columns: 1fr; gap: 1.25rem; }
            .card-body { padding: 1.25rem; }
        }

        /* Feature row */
        .feature-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            align-items: start;
        }
        .feature-item {
            text-align: center;
            padding: 2rem 1.5rem;
            border-radius: var(--radius-2xl);
            background: #fff;
            border: 1px solid var(--color-border);
            transition: all 0.3s ease;
        }
        .feature-item:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: #cbd5e1;
        }
        .feature-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }
        .feature-icon.blue { background: #eff6ff; color: var(--color-primary); }
        .feature-icon.orange { background: #fff7ed; color: var(--color-accent); }
        .feature-icon.green { background: #f0fdf4; color: #16a34a; }
        .feature-title { font-size: 1.1rem; font-weight: 700; margin: 0 0 0.5rem; color: var(--color-text-main); }
        .feature-desc { font-size: 0.9rem; color: var(--color-muted); line-height: 1.6; margin: 0; }
        @media (max-width: 768px) {
            .feature-row { grid-template-columns: 1fr; gap: 1.25rem; }
            .feature-item { padding: 1.5rem 1rem; }
        }

        /* Stats */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            text-align: center;
        }
        .stat-card {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-2xl);
            padding: 2rem 1.5rem;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-card);
        }
        .stat-card:hover { box-shadow: var(--shadow-card-hover); }
        .stat-number {
            font-size: 2.8rem;
            font-weight: 900;
            color: var(--color-primary);
            letter-spacing: -0.03em;
            line-height: 1;
        }
        .stat-label { font-size: 0.9rem; color: var(--color-muted); margin-top: 0.5rem; }
        @media (max-width: 768px) {
            .stats-row { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
            .stat-number { font-size: 2rem; }
            .stat-card { padding: 1.5rem 1rem; }
        }
        @media (max-width: 520px) {
            .stats-row { grid-template-columns: 1fr 1fr; }
        }

        /* FAQ */
        .faq-list { max-width: 760px; margin: 0 auto; }
        .faq-item {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-xl);
            padding: 1.5rem;
            margin-bottom: 0.85rem;
            background: #fff;
            transition: all 0.2s ease;
            cursor: pointer;
        }
        .faq-item:hover { border-color: #cbd5e1; box-shadow: var(--shadow-card); }
        .faq-q {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--color-text-main);
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
        }
        .faq-q i { color: var(--color-muted); font-size: 0.8rem; transition: transform 0.3s ease; }
        .faq-a {
            margin-top: 0.75rem;
            font-size: 0.95rem;
            color: var(--color-text-soft);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-a { display: block; }
        .faq-item.open .faq-q i { transform: rotate(180deg); color: var(--color-primary); }
        @media (max-width: 768px) {
            .faq-item { padding: 1.25rem; }
            .faq-q { font-size: 0.95rem; }
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
            border-radius: var(--radius-3xl);
            padding: 3.5rem 3rem;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: rgba(255,255,255,0.04);
            border-radius: 50%;
        }
        .cta-title { font-size: 2rem; font-weight: 800; margin: 0 0 0.75rem; position: relative; z-index: 1; }
        .cta-desc { font-size: 1.05rem; opacity: 0.9; margin: 0 0 2rem; position: relative; z-index: 1; }
        .btn-cta-large {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: #fff;
            color: var(--color-primary);
            padding: 0.9rem 2.5rem;
            border-radius: 2.5rem;
            font-weight: 700;
            font-size: 1.05rem;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            z-index: 1;
            box-shadow: 0 6px 24px -4px rgba(0,0,0,0.2);
        }
        .btn-cta-large:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 32px -4px rgba(0,0,0,0.3);
        }
        @media (max-width: 768px) {
            .cta-section { padding: 2.5rem 1.5rem; border-radius: var(--radius-2xl); }
            .cta-title { font-size: 1.5rem; }
            .cta-desc { font-size: 0.95rem; }
            .btn-cta-large { padding: 0.75rem 2rem; font-size: 0.95rem; }
        }

        /* Footer */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 3rem 0 2rem;
            margin-top: 3rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 3rem;
            margin-bottom: 2.5rem;
        }
        .footer-brand-name {
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            margin: 0 0 0.75rem;
            letter-spacing: -0.02em;
        }
        .footer-desc { font-size: 0.9rem; line-height: 1.7; opacity: 0.75; margin: 0; }
        .footer-col-title {
            font-size: 0.85rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            margin: 0 0 1rem;
        }
        .footer-links { list-style: none; padding: 0; margin: 0; }
        .footer-links li { margin-bottom: 0.6rem; }
        .footer-links a { font-size: 0.9rem; color: #94a3b8; transition: color 0.2s; }
        .footer-links a:hover { color: #fff; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 1.5rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
            opacity: 0.7;
            gap: 0.75rem;
        }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
            .site-footer { padding: 2.5rem 0 1.5rem; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

/* roulang page: category1 */
:root {
            --color-primary: #1e40af;
            --color-primary-light: #2563eb;
            --color-primary-dark: #1a3590;
            --color-accent: #f59e0b;
            --color-accent-light: #fbbf24;
            --color-accent-dark: #d97706;
            --color-bg: #f8fafc;
            --color-bg-white: #ffffff;
            --color-bg-gray: #f1f5f9;
            --color-text: #1e293b;
            --color-text-weak: #64748b;
            --color-text-muted: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-success: #10b981;
            --color-danger: #ef4444;
            --color-info: #3b82f6;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 9999px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.10), 0 4px 8px rgba(0, 0, 0, 0.05);
            --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.12), 0 8px 16px rgba(0, 0, 0, 0.06);
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.35s ease;
            --font-sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --header-height: 140px;
            --nav-tabs-height: 52px;
        }

        *,
        *::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: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }

        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
        }

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

        /* Header */
        .site-header {
            background: var(--color-bg-white);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-md);
        }

        .header-top-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 0;
            gap: 16px;
            flex-wrap: wrap;
        }

        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--color-primary);
            white-space: nowrap;
            flex-shrink: 0;
        }

        .header-logo i {
            font-size: 1.75rem;
            color: var(--color-accent);
        }

        .header-logo:hover {
            color: var(--color-primary-light);
        }

        .header-search-wrap {
            display: flex;
            align-items: center;
            flex: 1;
            max-width: 420px;
            min-width: 200px;
            position: relative;
        }

        .header-search-input {
            width: 100%;
            padding: 10px 44px 10px 16px;
            border: 2px solid var(--color-border);
            border-radius: var(--radius-full);
            font-size: 0.95rem;
            background: var(--color-bg);
            transition: all var(--transition-base);
            color: var(--color-text);
        }

        .header-search-input:focus {
            border-color: var(--color-primary-light);
            background: var(--color-bg-white);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.10);
        }

        .header-search-input::placeholder {
            color: var(--color-text-muted);
        }

        .header-search-btn {
            position: absolute;
            right: 4px;
            top: 50%;
            transform: translateY(-50%);
            background: var(--color-primary);
            color: #fff;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-base);
            font-size: 0.9rem;
        }

        .header-search-btn:hover {
            background: var(--color-primary-light);
            transform: translateY(-50%) scale(1.05);
        }

        .header-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 22px;
            background: var(--color-accent);
            color: #fff;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.95rem;
            white-space: nowrap;
            transition: all var(--transition-base);
            flex-shrink: 0;
        }

        .header-cta-btn:hover {
            background: var(--color-accent-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* Nav Tabs Row */
        .nav-tabs-wrapper {
            border-top: 1px solid var(--color-border-light);
            background: var(--color-bg-white);
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }

        .nav-tabs-wrapper::-webkit-scrollbar {
            display: none;
        }

        .nav-tabs-row {
            display: flex;
            gap: 4px;
            padding: 6px 0;
            flex-wrap: nowrap;
            white-space: nowrap;
            align-items: center;
            min-width: max-content;
        }

        .nav-tab {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 20px;
            border-radius: var(--radius-full);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--color-text-weak);
            transition: all var(--transition-base);
            cursor: pointer;
            position: relative;
            white-space: nowrap;
        }

        .nav-tab i {
            font-size: 0.85rem;
        }

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

        .nav-tab.active {
            color: #fff;
            background: var(--color-primary);
            font-weight: 600;
            box-shadow: var(--shadow-sm);
        }

        .nav-tab.active:hover {
            color: #fff;
            background: var(--color-primary-light);
        }

        /* 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: 70px 0;
            min-height: 320px;
            display: flex;
            align-items: center;
        }

        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(30, 64, 175, 0.88) 0%, rgba(15, 30, 80, 0.78) 60%, rgba(0, 0, 0, 0.65) 100%);
            z-index: 1;
        }

        .category-banner .container {
            position: relative;
            z-index: 2;
        }

        .category-banner-content {
            max-width: 700px;
            color: #fff;
        }

        .category-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--color-accent);
            color: #1a1a1a;
            padding: 6px 16px;
            border-radius: var(--radius-full);
            font-weight: 700;
            font-size: 0.85rem;
            letter-spacing: 0.5px;
            margin-bottom: 16px;
        }

        .category-banner-title {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }

        .category-banner-desc {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.6;
            max-width: 550px;
        }

        .category-stats-row {
            display: flex;
            gap: 32px;
            margin-top: 24px;
            flex-wrap: wrap;
        }

        .category-stat-item {
            display: flex;
            align-items: center;
            gap: 8px;
            color: rgba(255, 255, 255, 0.9);
            font-size: 0.95rem;
        }

        .category-stat-item i {
            color: var(--color-accent-light);
            font-size: 1.1rem;
        }

        .category-stat-item strong {
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
        }

        /* Filter Bar */
        .filter-bar {
            background: var(--color-bg-white);
            border-bottom: 1px solid var(--color-border-light);
            padding: 16px 0;
            position: sticky;
            top: var(--header-height);
            z-index: 100;
            box-shadow: var(--shadow-sm);
        }

        .filter-bar-inner {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .filter-label {
            font-weight: 600;
            color: var(--color-text);
            font-size: 0.9rem;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .filter-pills {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        .filter-pill {
            display: inline-flex;
            align-items: center;
            padding: 7px 16px;
            border-radius: var(--radius-full);
            font-size: 0.88rem;
            font-weight: 500;
            color: var(--color-text-weak);
            background: var(--color-bg-gray);
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
            border: 1.5px solid transparent;
        }

        .filter-pill:hover {
            color: var(--color-primary);
            background: rgba(30, 64, 175, 0.06);
            border-color: rgba(30, 64, 175, 0.2);
        }

        .filter-pill.active {
            color: #fff;
            background: var(--color-primary);
            border-color: var(--color-primary);
            font-weight: 600;
        }

        .filter-sort-select {
            padding: 8px 14px;
            border: 1.5px solid var(--color-border);
            border-radius: var(--radius-full);
            font-size: 0.88rem;
            color: var(--color-text);
            background: var(--color-bg-white);
            cursor: pointer;
            transition: all var(--transition-fast);
            appearance: none;
            -webkit-appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 12px center;
            padding-right: 36px;
            flex-shrink: 0;
        }

        .filter-sort-select:focus {
            border-color: var(--color-primary-light);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.08);
        }

        /* Main Content Area */
        .category-main {
            padding: 40px 0 60px;
            flex: 1;
        }

        .category-layout {
            display: grid;
            grid-template-columns: 1fr 340px;
            gap: 36px;
            align-items: start;
        }

        /* Article Cards Grid */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

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

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

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

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

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

        .article-card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--color-accent);
            color: #1a1a1a;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 700;
            letter-spacing: 0.3px;
            z-index: 2;
        }

        .article-card-tag.hot {
            background: #ef4444;
            color: #fff;
        }

        .article-card-tag.new {
            background: #10b981;
            color: #fff;
        }

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

        .article-card-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--color-text);
            line-height: 1.45;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .article-card-title a {
            color: inherit;
            transition: color var(--transition-fast);
        }

        .article-card-title a:hover {
            color: var(--color-primary);
        }

        .article-card-excerpt {
            font-size: 0.9rem;
            color: var(--color-text-weak);
            line-height: 1.55;
            margin-bottom: 14px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }

        .article-card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.8rem;
            color: var(--color-text-muted);
            padding-top: 12px;
            border-top: 1px solid var(--color-border-light);
        }

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

        .article-card-meta i {
            font-size: 0.75rem;
        }

        /* Featured Card (spans full width) */
        .article-card.featured {
            grid-column: 1 / -1;
            flex-direction: row;
        }

        .article-card.featured .article-card-image-wrap {
            width: 48%;
            min-width: 280px;
            aspect-ratio: auto;
            flex-shrink: 0;
        }

        .article-card.featured .article-card-body {
            padding: 24px 28px 28px;
        }

        .article-card.featured .article-card-title {
            font-size: 1.35rem;
            -webkit-line-clamp: 3;
        }

        .article-card.featured .article-card-excerpt {
            -webkit-line-clamp: 3;
            font-size: 0.95rem;
        }

        /* Sidebar */
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 24px;
            position: sticky;
            top: calc(var(--header-height) + 70px);
        }

        .sidebar-card {
            background: var(--color-bg-white);
            border-radius: var(--radius-lg);
            padding: 22px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
        }

        .sidebar-card-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--color-primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .sidebar-card-title i {
            color: var(--color-accent);
        }

        .sidebar-article-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .sidebar-article-item {
            display: flex;
            gap: 12px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--color-border-light);
            transition: all var(--transition-fast);
        }

        .sidebar-article-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .sidebar-article-item:hover {
            transform: translateX(3px);
        }

        .sidebar-article-thumb {
            width: 72px;
            height: 54px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--color-bg-gray);
        }

        .sidebar-article-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .sidebar-article-info {
            flex: 1;
            min-width: 0;
        }

        .sidebar-article-info h4 {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--color-text);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 4px;
        }

        .sidebar-article-info h4 a:hover {
            color: var(--color-primary);
        }

        .sidebar-article-info span {
            font-size: 0.78rem;
            color: var(--color-text-muted);
        }

        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .sidebar-tag {
            display: inline-block;
            padding: 5px 14px;
            background: var(--color-bg-gray);
            color: var(--color-text-weak);
            border-radius: var(--radius-full);
            font-size: 0.82rem;
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .sidebar-tag:hover {
            background: var(--color-primary);
            color: #fff;
        }

        /* Pagination */
        .pagination-wrap {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            margin-top: 40px;
            padding-top: 24px;
        }

        .page-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: var(--radius-full);
            font-weight: 500;
            font-size: 0.9rem;
            color: var(--color-text-weak);
            background: var(--color-bg-white);
            border: 1.5px solid var(--color-border);
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .page-btn:hover {
            border-color: var(--color-primary-light);
            color: var(--color-primary);
            background: rgba(30, 64, 175, 0.04);
        }

        .page-btn.active {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
            font-weight: 700;
        }

        .page-btn.disabled {
            opacity: 0.4;
            pointer-events: none;
            cursor: not-allowed;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, #1e3a5f 0%, #1a3590 40%, #1e40af 100%);
            padding: 60px 0;
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -80px;
            width: 280px;
            height: 280px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            pointer-events: none;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-title {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 10px;
            letter-spacing: -0.3px;
        }

        .cta-desc {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.78);
            margin-bottom: 28px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-btn-group {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .cta-btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 32px;
            background: var(--color-accent);
            color: #1a1a1a;
            border-radius: var(--radius-full);
            font-weight: 700;
            font-size: 1rem;
            transition: all var(--transition-base);
        }

        .cta-btn-primary:hover {
            background: var(--color-accent-light);
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(245, 158, 11, 0.35);
        }

        .cta-btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 32px;
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.45);
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition-base);
        }

        .cta-btn-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-3px);
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.88rem;
            color: var(--color-text-muted);
            padding: 16px 0 8px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--color-text-weak);
            transition: color var(--transition-fast);
        }

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

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

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

        /* Footer */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 50px 0 0;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 36px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-brand-name {
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }

        .footer-desc {
            font-size: 0.9rem;
            line-height: 1.6;
            color: #94a3b8;
            max-width: 340px;
        }

        .footer-col-title {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-links li a {
            font-size: 0.9rem;
            color: #94a3b8;
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .footer-links li a:hover {
            color: #fff;
            transform: translateX(3px);
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0;
            font-size: 0.85rem;
            color: #64748b;
            flex-wrap: wrap;
            gap: 8px;
        }

        /* Mobile Menu Toggle */
        .mobile-menu-toggle {
            display: none;
            background: var(--color-primary);
            color: #fff;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            flex-shrink: 0;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .category-layout {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .sidebar {
                position: static;
                display: grid;
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }

            .articles-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }

            .article-card.featured {
                flex-direction: column;
            }

            .article-card.featured .article-card-image-wrap {
                width: 100%;
                min-width: auto;
                aspect-ratio: 16 / 10;
            }

            .category-banner {
                padding: 50px 0;
                min-height: 260px;
            }

            .category-banner-title {
                font-size: 2rem;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 768px) {
            .header-top-row {
                gap: 10px;
            }

            .header-logo {
                font-size: 1.2rem;
            }

            .header-search-wrap {
                order: 3;
                max-width: 100%;
                flex: 1 1 100%;
            }

            .header-cta-btn {
                font-size: 0.85rem;
                padding: 8px 16px;
            }

            .mobile-menu-toggle {
                display: flex;
            }

            .nav-tabs-row {
                gap: 2px;
            }

            .nav-tab {
                padding: 8px 14px;
                font-size: 0.85rem;
            }

            .articles-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .sidebar {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .category-banner {
                padding: 36px 0;
                min-height: 220px;
            }

            .category-banner-title {
                font-size: 1.6rem;
            }

            .category-banner-desc {
                font-size: 0.95rem;
            }

            .category-stats-row {
                gap: 16px;
            }

            .category-stat-item {
                font-size: 0.85rem;
            }

            .category-stat-item strong {
                font-size: 1.1rem;
            }

            .filter-bar-inner {
                gap: 8px;
            }

            .filter-pill {
                padding: 6px 12px;
                font-size: 0.8rem;
            }

            .cta-title {
                font-size: 1.5rem;
            }

            .cta-desc {
                font-size: 0.9rem;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 22px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .pagination-wrap {
                gap: 5px;
            }

            .page-btn {
                width: 36px;
                height: 36px;
                font-size: 0.82rem;
            }

            .article-card.featured .article-card-body {
                padding: 16px 18px 18px;
            }

            .article-card.featured .article-card-title {
                font-size: 1.1rem;
            }

            .breadcrumb {
                font-size: 0.8rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 14px;
                padding-right: 14px;
            }

            .category-banner {
                padding: 28px 0;
                min-height: 180px;
            }

            .category-banner-title {
                font-size: 1.35rem;
            }

            .category-banner-desc {
                font-size: 0.85rem;
            }

            .category-stats-row {
                gap: 10px;
                flex-direction: column;
            }

            .filter-pills {
                gap: 5px;
            }

            .filter-pill {
                padding: 5px 10px;
                font-size: 0.75rem;
            }

            .article-card-body {
                padding: 12px 14px 16px;
            }

            .article-card-title {
                font-size: 0.95rem;
            }

            .article-card-excerpt {
                font-size: 0.82rem;
            }

            .article-card-meta {
                font-size: 0.73rem;
            }

            .cta-btn-primary,
            .cta-btn-outline {
                padding: 10px 22px;
                font-size: 0.9rem;
            }

            .sidebar-card {
                padding: 16px;
            }
        }

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

        /* Smooth image loading */
        .article-card-image-wrap img,
        .sidebar-article-thumb img {
            transition: opacity 0.3s ease;
        }

/* roulang page: article */
:root {
            --color-primary: #1a365d;
            --color-primary-light: #2c5282;
            --color-primary-dark: #0f1f3a;
            --color-accent: #f59e0b;
            --color-accent-light: #fbbf24;
            --color-accent-dark: #d97706;
            --color-surface: #f8fafc;
            --color-surface-alt: #f1f5f9;
            --color-text-main: #1e293b;
            --color-text-soft: #64748b;
            --color-text-muted: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 0.875rem;
            --radius-xl: 1.125rem;
            --radius-2xl: 1.5rem;
            --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.04);
            --shadow-card-hover: 0 2px 8px rgba(0,0,0,0.08), 0 8px 28px rgba(0,0,0,0.06);
            --shadow-nav: 0 1px 0 rgba(0,0,0,0.05), 0 4px 12px rgba(0,0,0,0.03);
            --transition-fast: 180ms ease;
            --transition-smooth: 280ms cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text-main);
            background-color: var(--color-surface);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

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

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

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

        .container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        @media (min-width: 768px) {
            .container {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }

        /* Header & Navigation */
        .site-header {
            background: #ffffff;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-nav);
        }

        .header-top-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 0.875rem;
            padding-bottom: 0.875rem;
            gap: 1rem;
        }

        .header-logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: -0.01em;
            white-space: nowrap;
            transition: color var(--transition-fast);
            flex-shrink: 0;
        }

        .header-logo:hover {
            color: var(--color-primary-light);
        }

        .header-logo i {
            font-size: 1.5rem;
            color: var(--color-accent);
            transition: transform var(--transition-smooth);
        }

        .header-logo:hover i {
            transform: rotate(-12deg) scale(1.1);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            flex-shrink: 0;
        }

        .header-search-wrap {
            display: none;
            position: relative;
        }

        @media (min-width: 640px) {
            .header-search-wrap {
                display: flex;
                align-items: center;
            }
        }

        .header-search-input {
            width: 200px;
            padding: 0.5rem 2.25rem 0.5rem 0.875rem;
            border: 1.5px solid var(--color-border);
            border-radius: 9999px;
            font-size: 0.875rem;
            background: var(--color-surface);
            color: var(--color-text-main);
            outline: none;
            transition: all var(--transition-fast);
        }

        .header-search-input:focus {
            border-color: var(--color-primary-light);
            background: #ffffff;
            box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.08);
            width: 240px;
        }

        .header-search-input::placeholder {
            color: var(--color-text-muted);
        }

        .header-search-btn {
            position: absolute;
            right: 0.5rem;
            background: none;
            border: none;
            color: var(--color-text-soft);
            cursor: pointer;
            padding: 0.25rem;
            font-size: 0.9rem;
            transition: color var(--transition-fast);
        }

        .header-search-btn:hover {
            color: var(--color-primary);
        }

        .header-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
            padding: 0.5rem 1.125rem;
            background: var(--color-accent);
            color: #1a1a1a;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.875rem;
            white-space: nowrap;
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
        }

        .header-cta-btn:hover {
            background: var(--color-accent-light);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
        }

        .header-cta-btn:active {
            transform: translateY(0);
            background: var(--color-accent-dark);
        }

        /* Nav Tabs Row */
        .nav-tabs-row {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            padding-top: 0.25rem;
            padding-bottom: 0.75rem;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }

        .nav-tabs-row::-webkit-scrollbar {
            display: none;
        }

        .nav-tab {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.55rem 1.1rem;
            border-radius: 9999px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-soft);
            white-space: nowrap;
            transition: all var(--transition-fast);
            background: transparent;
            border: 1.5px solid transparent;
            cursor: pointer;
            flex-shrink: 0;
        }

        .nav-tab:hover {
            color: var(--color-primary);
            background: rgba(26, 54, 93, 0.04);
        }

        .nav-tab.active {
            background: var(--color-primary);
            color: #ffffff;
            font-weight: 600;
            border-color: var(--color-primary);
            box-shadow: 0 2px 8px rgba(26, 54, 93, 0.25);
        }

        .nav-tab.active i {
            color: var(--color-accent-light);
        }

        .nav-tab i {
            font-size: 0.85rem;
            transition: color var(--transition-fast);
        }

        /* Main Content */
        .main-content {
            flex: 1;
            padding-bottom: 3rem;
        }

        /* Article Banner */
        .article-banner {
            position: relative;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            padding: 3rem 0 2.5rem;
            color: #ffffff;
            overflow: hidden;
        }

        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 31, 58, 0.88) 0%, rgba(26, 54, 93, 0.78) 50%, rgba(15, 31, 58, 0.85) 100%);
            z-index: 1;
        }

        .article-banner .container {
            position: relative;
            z-index: 2;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.35rem;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 1rem;
        }

        .breadcrumb a {
            color: rgba(255, 255, 255, 0.85);
            transition: color var(--transition-fast);
        }

        .breadcrumb a:hover {
            color: var(--color-accent-light);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .breadcrumb .separator {
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.7rem;
        }

        .breadcrumb .current {
            color: #ffffff;
            font-weight: 500;
            pointer-events: none;
        }

        .article-banner-title {
            font-size: 1.75rem;
            font-weight: 700;
            line-height: 1.35;
            margin: 0 0 0.75rem;
            color: #ffffff;
            letter-spacing: -0.01em;
        }

        @media (min-width: 640px) {
            .article-banner-title {
                font-size: 2rem;
            }
        }

        @media (min-width: 1024px) {
            .article-banner-title {
                font-size: 2.35rem;
            }
            .article-banner {
                padding: 4rem 0 3rem;
            }
        }

        .article-banner-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 1rem;
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.8);
        }

        .article-banner-meta .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
        }

        .article-banner-meta .meta-item i {
            font-size: 0.8rem;
            color: var(--color-accent-light);
        }

        .category-badge {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.75rem;
            background: var(--color-accent);
            color: #1a1a1a;
            border-radius: 9999px;
            font-size: 0.8rem;
            font-weight: 600;
            white-space: nowrap;
        }

        /* Article Layout */
        .article-layout {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
            margin-top: 2rem;
        }

        @media (min-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr 320px;
                gap: 2.5rem;
                margin-top: 2.5rem;
            }
        }

        /* Article Body */
        .article-body-card {
            background: #ffffff;
            border-radius: var(--radius-xl);
            padding: 1.5rem;
            box-shadow: var(--shadow-card);
            overflow: hidden;
        }

        @media (min-width: 640px) {
            .article-body-card {
                padding: 2rem;
            }
        }

        @media (min-width: 1024px) {
            .article-body-card {
                padding: 2.5rem;
                border-radius: var(--radius-2xl);
            }
        }

        .article-cover-image {
            width: 100%;
            border-radius: var(--radius-lg);
            margin-bottom: 1.5rem;
            object-fit: cover;
            aspect-ratio: 16 / 9;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
        }

        @media (min-width: 768px) {
            .article-cover-image {
                margin-bottom: 2rem;
                border-radius: var(--radius-xl);
            }
        }

        .article-content {
            font-size: 1rem;
            line-height: 1.85;
            color: var(--color-text-main);
            word-break: break-word;
        }

        .article-content h2 {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--color-primary);
            margin: 2rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--color-border-light);
            line-height: 1.4;
        }

        .article-content h3 {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--color-text-main);
            margin: 1.5rem 0 0.75rem;
            line-height: 1.4;
        }

        .article-content p {
            margin: 0 0 1rem;
        }

        .article-content ul,
        .article-content ol {
            margin: 0 0 1.25rem;
            padding-left: 1.5rem;
        }

        .article-content li {
            margin-bottom: 0.4rem;
        }

        .article-content img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-md);
            margin: 1.25rem 0;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
        }

        .article-content blockquote {
            border-left: 4px solid var(--color-accent);
            background: #fffbeb;
            padding: 1rem 1.25rem;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            color: #92400e;
            font-style: italic;
        }

        .article-content a {
            color: var(--color-primary-light);
            text-decoration: underline;
            text-underline-offset: 2px;
            transition: color var(--transition-fast);
        }

        .article-content a:hover {
            color: var(--color-accent-dark);
        }

        .article-content strong {
            color: var(--color-primary-dark);
            font-weight: 600;
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.25rem 0;
            font-size: 0.9rem;
        }

        .article-content th,
        .article-content td {
            border: 1px solid var(--color-border);
            padding: 0.6rem 0.85rem;
            text-align: left;
        }

        .article-content th {
            background: var(--color-surface-alt);
            font-weight: 600;
            color: var(--color-primary);
        }

        /* Article Footer Meta */
        .article-footer-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            margin-top: 2rem;
            padding-top: 1.25rem;
            border-top: 1px solid var(--color-border-light);
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            align-items: center;
        }

        .article-tags-label {
            font-size: 0.8rem;
            color: var(--color-text-muted);
            font-weight: 500;
        }

        .tag-pill {
            display: inline-block;
            padding: 0.3rem 0.75rem;
            background: var(--color-surface-alt);
            color: var(--color-text-soft);
            border-radius: 9999px;
            font-size: 0.8rem;
            font-weight: 500;
            transition: all var(--transition-fast);
            border: 1px solid var(--color-border-light);
        }

        .tag-pill:hover {
            background: var(--color-primary);
            color: #ffffff;
            border-color: var(--color-primary);
        }

        .share-btns {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .share-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 2.25rem;
            height: 2.25rem;
            border-radius: 50%;
            background: var(--color-surface-alt);
            color: var(--color-text-soft);
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            border: 1px solid var(--color-border-light);
            cursor: pointer;
        }

        .share-btn:hover {
            background: var(--color-primary);
            color: #ffffff;
            border-color: var(--color-primary);
            transform: translateY(-2px);
            box-shadow: 0 4px 10px rgba(26, 54, 93, 0.25);
        }

        /* Sidebar */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .sidebar-card {
            background: #ffffff;
            border-radius: var(--radius-xl);
            padding: 1.35rem;
            box-shadow: var(--shadow-card);
        }

        .sidebar-card h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--color-primary);
            margin: 0 0 0.875rem;
            padding-bottom: 0.6rem;
            border-bottom: 2px solid var(--color-border-light);
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }

        .sidebar-card h4 i {
            color: var(--color-accent);
            font-size: 0.85rem;
        }

        .sidebar-about-text {
            font-size: 0.875rem;
            color: var(--color-text-soft);
            line-height: 1.65;
            margin: 0;
        }

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

        .sidebar-link-list li {
            padding: 0.5rem 0;
            border-bottom: 1px solid var(--color-border-light);
        }

        .sidebar-link-list li:last-child {
            border-bottom: none;
        }

        .sidebar-link-list a {
            font-size: 0.875rem;
            color: var(--color-text-soft);
            transition: color var(--transition-fast);
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }

        .sidebar-link-list a:hover {
            color: var(--color-primary);
        }

        .sidebar-link-list a i {
            font-size: 0.7rem;
            color: var(--color-accent);
        }

        .sidebar-cta-btn {
            display: block;
            width: 100%;
            text-align: center;
            padding: 0.7rem 1rem;
            background: var(--color-accent);
            color: #1a1a1a;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.9rem;
            margin-top: 0.6rem;
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
        }

        .sidebar-cta-btn:hover {
            background: var(--color-accent-light);
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
        }

        /* Not Found State */
        .not-found-card {
            background: #ffffff;
            border-radius: var(--radius-2xl);
            padding: 3rem 1.5rem;
            text-align: center;
            box-shadow: var(--shadow-card);
        }

        @media (min-width: 640px) {
            .not-found-card {
                padding: 4rem 2rem;
            }
        }

        .not-found-icon {
            font-size: 4rem;
            color: var(--color-text-muted);
            margin-bottom: 1rem;
            display: block;
        }

        .not-found-card h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--color-primary);
            margin: 0 0 0.75rem;
        }

        .not-found-card p {
            color: var(--color-text-soft);
            margin: 0 0 1.5rem;
            font-size: 0.95rem;
            line-height: 1.6;
        }

        .back-home-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.75rem;
            background: var(--color-primary);
            color: #ffffff;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            text-decoration: none;
        }

        .back-home-btn:hover {
            background: var(--color-primary-light);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(26, 54, 93, 0.3);
            color: #ffffff;
        }

        .back-home-btn i {
            font-size: 0.85rem;
        }

        /* Footer */
        .site-footer {
            background: var(--color-primary-dark);
            color: rgba(255, 255, 255, 0.85);
            padding: 2.5rem 0 1.5rem;
            margin-top: auto;
        }

        @media (min-width: 768px) {
            .site-footer {
                padding: 3.5rem 0 1.75rem;
            }
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
            margin-bottom: 2rem;
        }

        @media (min-width: 640px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }
        }

        @media (min-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr;
                gap: 3rem;
            }
        }

        .footer-brand-name {
            font-size: 1.2rem;
            font-weight: 700;
            color: #ffffff;
            margin: 0 0 0.6rem;
            letter-spacing: -0.01em;
        }

        .footer-desc {
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.65;
            margin: 0;
            max-width: 360px;
        }

        .footer-col-title {
            font-size: 0.95rem;
            font-weight: 600;
            color: #ffffff;
            margin: 0 0 0.75rem;
            letter-spacing: 0.01em;
        }

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

        .footer-links li {
            margin-bottom: 0.45rem;
        }

        .footer-links a {
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.7);
            transition: color var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
        }

        .footer-links a:hover {
            color: var(--color-accent-light);
        }

        .footer-links a i {
            font-size: 0.75rem;
            width: 1rem;
            text-align: center;
        }

        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 0.75rem;
            padding-top: 1.25rem;
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.5);
        }

        /* Responsive adjustments */
        @media (max-width: 639px) {
            .article-banner {
                padding: 2rem 0 1.75rem;
            }
            .article-banner-title {
                font-size: 1.35rem;
            }
            .article-body-card {
                padding: 1.25rem;
                border-radius: var(--radius-lg);
            }
            .article-content h2 {
                font-size: 1.2rem;
            }
            .article-content h3 {
                font-size: 1.05rem;
            }
            .article-layout {
                margin-top: 1.25rem;
                gap: 1.25rem;
            }
            .header-logo {
                font-size: 1.1rem;
            }
            .header-logo i {
                font-size: 1.2rem;
            }
            .nav-tab {
                padding: 0.45rem 0.8rem;
                font-size: 0.8rem;
            }
        }

        @media (max-width: 480px) {
            .article-banner-title {
                font-size: 1.2rem;
            }
            .article-banner-meta {
                font-size: 0.78rem;
                gap: 0.6rem;
            }
            .article-body-card {
                padding: 1rem;
            }
            .article-content {
                font-size: 0.925rem;
                line-height: 1.75;
            }
            .article-footer-meta {
                flex-direction: column;
                align-items: flex-start;
            }
            .header-cta-btn {
                font-size: 0.78rem;
                padding: 0.4rem 0.85rem;
            }
        }

        /* Focus visible */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2.5px solid var(--color-accent);
            outline-offset: 3px;
            border-radius: 4px;
        }

        .nav-tab:focus-visible {
            outline-offset: 2px;
        }