/* roulang page: index */
:root {
            --color-primary: #1b2a4a;
            --color-primary-light: #243660;
            --color-accent: #d4a853;
            --color-accent-hover: #c4963d;
            --color-accent-light: #f5ecd7;
            --color-bg: #f9f8f6;
            --color-surface: #ffffff;
            --color-text: #2c2c2c;
            --color-text-secondary: #5f6b7a;
            --color-text-muted: #8b95a5;
            --color-border: #e5e4e1;
            --color-border-light: #f0efec;
            --color-success: #3a8f6e;
            --color-warning: #e8a840;
            --color-error: #c94a4a;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 8px 32px rgba(0,0,0,0.1);
            --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
            --sidebar-width: 250px;
            --header-mobile-height: 60px;
            --transition-fast: 0.15s ease;
            --transition-normal: 0.25s ease;
            --transition-slow: 0.35s ease;
            --font-heading: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --font-body: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --font-mono: 'SF Mono', 'Consolas', 'Monaco', 'Courier New', monospace;
        }

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

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

        a:hover {
            color: var(--color-accent);
        }

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

        button, .button {
            cursor: pointer;
            font-family: var(--font-body);
            transition: all var(--transition-normal);
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-heading);
            line-height: 1.3;
            color: var(--color-primary);
            margin-top: 0;
        }

        h1 { font-size: 2.4rem; font-weight: 700; letter-spacing: -0.02em; }
        h2 { font-size: 1.9rem; font-weight: 700; letter-spacing: -0.01em; }
        h3 { font-size: 1.35rem; font-weight: 600; }
        h4 { font-size: 1.15rem; font-weight: 600; }

        .app-shell {
            display: flex;
            min-height: 100vh;
            position: relative;
        }

        /* Sidebar */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: linear-gradient(180deg, var(--color-primary) 0%, #152238 100%);
            color: #ffffff;
            display: flex;
            flex-direction: column;
            z-index: 100;
            box-shadow: 2px 0 24px rgba(0,0,0,0.15);
            transition: transform var(--transition-slow);
            overflow-y: auto;
        }

        .sidebar-logo {
            padding: 28px 24px 20px;
            font-size: 1.2rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            color: #ffffff;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            word-break: break-all;
            line-height: 1.4;
        }

        .sidebar-logo a {
            color: #ffffff;
            text-decoration: none;
        }

        .sidebar-logo a:hover {
            color: var(--color-accent);
        }

        .sidebar-nav {
            flex: 1;
            padding: 16px 0;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 13px 24px;
            color: rgba(255,255,255,0.78);
            text-decoration: none;
            font-size: 0.95rem;
            font-weight: 500;
            letter-spacing: 0.02em;
            transition: all var(--transition-fast);
            border-left: 3px solid transparent;
            position: relative;
        }

        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 0.9rem;
            opacity: 0.7;
            transition: opacity var(--transition-fast);
        }

        .sidebar-nav a:hover {
            color: #ffffff;
            background: rgba(255,255,255,0.06);
            border-left-color: rgba(255,255,255,0.3);
        }

        .sidebar-nav a:hover i {
            opacity: 1;
        }

        .sidebar-nav a.active {
            color: #ffffff;
            background: rgba(255,255,255,0.1);
            border-left-color: var(--color-accent);
            font-weight: 600;
        }

        .sidebar-nav a.active i {
            opacity: 1;
            color: var(--color-accent);
        }

        .sidebar-footer {
            padding: 16px 24px 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.78rem;
            color: rgba(255,255,255,0.45);
            line-height: 1.5;
        }

        /* Main Content */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* Mobile Header */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-mobile-height);
            background: var(--color-primary);
            color: #ffffff;
            z-index: 99;
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
            box-shadow: 0 2px 12px rgba(0,0,0,0.15);
        }

        .mobile-header .mobile-logo {
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.02em;
            color: #ffffff;
            text-decoration: none;
        }

        .mobile-menu-toggle {
            background: none;
            border: none;
            color: #ffffff;
            font-size: 1.5rem;
            padding: 8px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }

        .mobile-menu-toggle:hover {
            background: rgba(255,255,255,0.12);
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            z-index: 98;
            transition: opacity var(--transition-normal);
        }

        .sidebar-overlay.show {
            display: block;
            opacity: 1;
        }

        /* Hero */
        .hero-section {
            position: relative;
            background: linear-gradient(135deg, rgba(27,42,74,0.88) 0%, rgba(21,34,56,0.92) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            color: #ffffff;
            padding: 100px 48px 90px;
            display: flex;
            align-items: center;
            min-height: 520px;
        }

        .hero-inner {
            max-width: 720px;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(212,168,83,0.2);
            color: var(--color-accent);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            margin-bottom: 20px;
            border: 1px solid rgba(212,168,83,0.3);
        }

        .hero-section h1 {
            color: #ffffff;
            font-size: 2.6rem;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
            line-height: 1.25;
        }

        .hero-section .hero-subtitle {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.85);
            margin-bottom: 32px;
            line-height: 1.7;
            max-width: 580px;
        }

        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: var(--radius-md);
            text-decoration: none;
            letter-spacing: 0.02em;
            transition: all var(--transition-normal);
            border: 2px solid transparent;
            cursor: pointer;
            font-family: var(--font-body);
            line-height: 1.4;
        }

        .btn-primary {
            background: var(--color-accent);
            color: var(--color-primary);
            border-color: var(--color-accent);
            box-shadow: 0 4px 14px rgba(212,168,83,0.35);
        }

        .btn-primary:hover {
            background: var(--color-accent-hover);
            border-color: var(--color-accent-hover);
            box-shadow: 0 6px 20px rgba(212,168,83,0.45);
            transform: translateY(-2px);
            color: var(--color-primary);
        }

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

        .btn-outline:hover {
            background: rgba(255,255,255,0.1);
            border-color: #ffffff;
            color: #ffffff;
            transform: translateY(-2px);
        }

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

        .btn-secondary:hover {
            background: var(--color-primary-light);
            border-color: var(--color-primary-light);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            color: #ffffff;
        }

        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
            border-radius: var(--radius-sm);
        }

        .btn-lg {
            padding: 16px 36px;
            font-size: 1.05rem;
            border-radius: var(--radius-lg);
        }

        /* Sections */
        .section {
            padding: 72px 48px;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header h2 {
            margin-bottom: 12px;
            color: var(--color-primary);
        }

        .section-header .section-lead {
            color: var(--color-text-secondary);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--color-accent);
            margin-bottom: 10px;
        }

        /* Cards Grid */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }

        .card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-normal);
            position: relative;
            overflow: hidden;
        }

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

        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 18px;
            background: var(--color-accent-light);
            color: var(--color-accent);
        }

        .card h3 {
            margin-bottom: 10px;
            font-size: 1.2rem;
        }

        .card p {
            color: var(--color-text-secondary);
            margin: 0;
            font-size: 0.95rem;
            line-height: 1.65;
        }

        .card-image {
            border-radius: var(--radius-md);
            overflow: hidden;
            margin-bottom: 18px;
        }

        .card-image img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

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

        .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 14px;
            background: var(--color-accent-light);
            color: var(--color-accent);
            margin-bottom: 12px;
            letter-spacing: 0.03em;
        }

        /* Stats */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }

        .stat-item {
            padding: 20px;
        }

        .stat-number {
            font-size: 2.8rem;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: -0.02em;
            line-height: 1.1;
        }

        .stat-number .stat-suffix {
            color: var(--color-accent);
        }

        .stat-label {
            color: var(--color-text-secondary);
            font-size: 0.9rem;
            margin-top: 6px;
        }

        /* Features */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            padding: 40px 0;
        }

        .feature-block.reverse {
            direction: rtl;
        }

        .feature-block.reverse .feature-content {
            direction: ltr;
        }

        .feature-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }

        .feature-image img {
            width: 100%;
            height: auto;
            display: block;
        }

        .feature-content h3 {
            font-size: 1.6rem;
            margin-bottom: 14px;
        }

        .feature-content p {
            color: var(--color-text-secondary);
            font-size: 1rem;
            line-height: 1.7;
            margin-bottom: 20px;
        }

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

        .feature-list li {
            padding: 8px 0;
            display: flex;
            align-items: flex-start;
            gap: 10px;
            color: var(--color-text);
            font-size: 0.95rem;
        }

        .feature-list li i {
            color: var(--color-success);
            margin-top: 3px;
            flex-shrink: 0;
        }

        /* Info List (CMS) */
        .info-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
        }

        .info-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 24px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-normal);
            text-decoration: none;
            color: var(--color-text);
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

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

        .info-card .info-date {
            font-size: 0.8rem;
            color: var(--color-text-muted);
            letter-spacing: 0.03em;
        }

        .info-card h4 {
            margin: 0;
            font-size: 1.05rem;
            color: var(--color-primary);
            line-height: 1.4;
        }

        .info-card:hover h4 {
            color: var(--color-accent);
        }

        .info-card .info-excerpt {
            font-size: 0.9rem;
            color: var(--color-text-secondary);
            line-height: 1.6;
            margin: 0;
        }

        .info-empty {
            text-align: center;
            padding: 48px 24px;
            color: var(--color-text-muted);
            font-size: 1rem;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--color-border);
        }

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

        .faq-item {
            background: var(--color-surface);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            border: 1px solid var(--color-border-light);
            overflow: hidden;
            transition: all var(--transition-normal);
        }

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

        .faq-question {
            padding: 20px 28px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--color-primary);
            transition: color var(--transition-fast);
            user-select: none;
        }

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

        .faq-question .faq-icon {
            transition: transform var(--transition-normal);
            font-size: 0.85rem;
            color: var(--color-text-muted);
            flex-shrink: 0;
            margin-left: 16px;
        }

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

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

        .faq-item.open .faq-answer {
            max-height: 400px;
        }

        .faq-answer-inner {
            padding: 0 28px 20px;
            color: var(--color-text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, var(--color-primary) 0%, #1e3355 100%);
            color: #ffffff;
            text-align: center;
            padding: 72px 48px;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            background: rgba(212,168,83,0.08);
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -80px;
            left: -40px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(212,168,83,0.06);
            pointer-events: none;
        }

        .cta-section h2 {
            color: #ffffff;
            position: relative;
            z-index: 1;
            margin-bottom: 12px;
        }

        .cta-section p {
            color: rgba(255,255,255,0.8);
            position: relative;
            z-index: 1;
            font-size: 1.05rem;
            margin-bottom: 28px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-section .btn {
            position: relative;
            z-index: 1;
        }

        /* Footer */
        .site-footer {
            background: #141e30;
            color: rgba(255,255,255,0.7);
            padding: 48px 48px 28px;
            font-size: 0.9rem;
            line-height: 1.8;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-col h4 {
            color: #ffffff;
            font-size: 1rem;
            margin-bottom: 14px;
            font-weight: 600;
        }

        .footer-col a {
            color: rgba(255,255,255,0.6);
            text-decoration: none;
            display: block;
            padding: 3px 0;
            transition: color var(--transition-fast);
            font-size: 0.88rem;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 0.82rem;
            color: rgba(255,255,255,0.45);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hero-section {
                padding: 72px 32px 64px;
                min-height: 420px;
            }
            .hero-section h1 {
                font-size: 2.1rem;
            }
            .section {
                padding: 52px 32px;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .feature-block {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .feature-block.reverse {
                direction: ltr;
            }
            .cards-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
                box-shadow: none;
            }
            .sidebar.open {
                transform: translateX(0);
                box-shadow: 4px 0 32px rgba(0,0,0,0.25);
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-header {
                display: flex;
            }
            .sidebar-overlay.show {
                display: block;
            }
            .hero-section {
                padding: 60px 20px 52px;
                min-height: 380px;
                margin-top: var(--header-mobile-height);
            }
            .hero-section h1 {
                font-size: 1.75rem;
            }
            .hero-section .hero-subtitle {
                font-size: 1rem;
            }
            .section {
                padding: 40px 20px;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
            .cards-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .info-list {
                grid-template-columns: 1fr;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .stat-number {
                font-size: 2.2rem;
            }
            .cta-section {
                padding: 48px 20px;
            }
            .site-footer {
                padding: 36px 20px 20px;
            }
            .btn {
                padding: 11px 22px;
                font-size: 0.9rem;
            }
            .hero-actions {
                flex-direction: column;
                gap: 10px;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            .hero-section h1 {
                font-size: 1.5rem;
            }
            .section {
                padding: 32px 16px;
            }
            .card {
                padding: 22px 18px;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .stat-number {
                font-size: 1.8rem;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 0.9rem;
            }
            .faq-answer-inner {
                padding: 0 18px 16px;
            }
        }

        @media (min-width: 769px) {
            .sidebar-overlay {
                display: none !important;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #4f46e5;
            --primary-hover: #4338ca;
            --primary-light: #eef2ff;
            --primary-dark: #3730a3;
            --accent: #f59e0b;
            --accent-hover: #d97706;
            --accent-light: #fffbeb;
            --sidebar-bg: #1e293b;
            --sidebar-hover: #334155;
            --sidebar-active: #4f46e5;
            --sidebar-text: #cbd5e1;
            --sidebar-text-muted: #94a3b8;
            --body-bg: #f8fafc;
            --surface-bg: #ffffff;
            --card-bg: #ffffff;
            --text: #1e293b;
            --text-secondary: #475569;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 2px 8px rgba(0,0,0,0.03);
            --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 8px 32px rgba(0,0,0,0.04);
            --shadow-lg: 0 8px 24px rgba(0,0,0,0.1), 0 16px 48px rgba(0,0,0,0.06);
            --shadow-xl: 0 12px 36px rgba(0,0,0,0.12), 0 24px 64px rgba(0,0,0,0.06);
            --sidebar-width: 260px;
            --header-mobile-height: 60px;
            --transition-fast: 0.15s ease;
            --transition: 0.25s ease;
            --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
        }

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

        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-hover);
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        button {
            cursor: pointer;
            font-family: inherit;
        }
        button:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--text);
            line-height: 1.3;
            margin-top: 0;
        }

        /* Mobile Header */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-mobile-height);
            background: var(--surface-bg);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
            box-shadow: var(--shadow-xs);
        }
        .mobile-header .mobile-logo {
            font-weight: 700;
            font-size: 1rem;
            color: var(--text);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 65%;
        }
        .mobile-header .menu-toggle {
            width: 40px;
            height: 40px;
            border: none;
            background: transparent;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--text);
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }
        .mobile-header .menu-toggle:hover {
            background: var(--border-light);
        }
        .mobile-header .menu-toggle i {
            transition: transform var(--transition);
        }
        .mobile-header .menu-toggle.active i {
            transform: rotate(90deg);
        }

        /* Sidebar Overlay */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.5);
            z-index: 998;
            opacity: 0;
            transition: opacity var(--transition);
            pointer-events: none;
        }
        .sidebar-overlay.active {
            opacity: 1;
            pointer-events: auto;
        }

        /* Sidebar */
        .app-sidebar {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: var(--sidebar-width);
            background: var(--sidebar-bg);
            z-index: 999;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
            overflow-x: hidden;
            transition: transform var(--transition-slow);
            box-shadow: 2px 0 24px rgba(0,0,0,0.12);
        }
        .app-sidebar .sidebar-brand {
            padding: 24px 20px 20px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            flex-shrink: 0;
        }
        .app-sidebar .sidebar-brand .brand-name {
            font-size: 1.15rem;
            font-weight: 700;
            color: #ffffff;
            letter-spacing: 0.02em;
            line-height: 1.4;
        }
        .app-sidebar .sidebar-brand .brand-sub {
            font-size: 0.75rem;
            color: var(--sidebar-text-muted);
            margin-top: 2px;
        }
        .app-sidebar .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .app-sidebar .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 11px 14px;
            border-radius: var(--radius-sm);
            color: var(--sidebar-text);
            font-size: 0.95rem;
            font-weight: 500;
            text-decoration: none;
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }
        .app-sidebar .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 0.9rem;
            flex-shrink: 0;
            color: var(--sidebar-text-muted);
            transition: color var(--transition-fast);
        }
        .app-sidebar .sidebar-nav a:hover {
            background: var(--sidebar-hover);
            color: #ffffff;
        }
        .app-sidebar .sidebar-nav a:hover i {
            color: #ffffff;
        }
        .app-sidebar .sidebar-nav a.active {
            background: var(--sidebar-active);
            color: #ffffff;
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(79, 70, 229, 0.35);
        }
        .app-sidebar .sidebar-nav a.active i {
            color: #ffffff;
        }
        .app-sidebar .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255,255,255,0.08);
            flex-shrink: 0;
            font-size: 0.75rem;
            color: var(--sidebar-text-muted);
            line-height: 1.5;
        }
        .app-sidebar .sidebar-footer span {
            display: block;
        }

        /* Main Content */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            transition: margin-left var(--transition-slow);
        }
        .main-content {
            flex: 1;
            padding: 0;
        }

        /* Breadcrumbs */
        .breadcrumb-bar {
            background: var(--surface-bg);
            border-bottom: 1px solid var(--border);
            padding: 12px 28px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .breadcrumb-bar a {
            color: var(--text-muted);
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        .breadcrumb-bar a:hover {
            color: var(--primary);
        }
        .breadcrumb-bar .separator {
            margin: 0 8px;
            color: var(--text-light);
        }
        .breadcrumb-bar .current {
            color: var(--text);
            font-weight: 500;
        }

        /* Hero Section */
        .category-hero {
            position: relative;
            background: linear-gradient(135deg, #1e293b 0%, #334155 40%, #1e293b 100%);
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            padding: 64px 28px;
            color: #ffffff;
            overflow: hidden;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(30,41,59,0.88) 0%, rgba(30,41,59,0.7) 50%, rgba(30,41,59,0.85) 100%);
            z-index: 1;
        }
        .category-hero .hero-inner {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }
        .category-hero .hero-badge {
            display: inline-block;
            background: rgba(255,255,255,0.15);
            border: 1px solid rgba(255,255,255,0.25);
            color: #e2e8f0;
            padding: 6px 16px;
            border-radius: 24px;
            font-size: 0.8rem;
            font-weight: 500;
            letter-spacing: 0.04em;
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }
        .category-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
            line-height: 1.25;
        }
        .category-hero .hero-desc {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.8);
            line-height: 1.7;
            margin-bottom: 28px;
            max-width: 620px;
        }
        .category-hero .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: var(--radius);
            font-size: 0.95rem;
            font-weight: 600;
            text-decoration: none;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            line-height: 1.4;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #ffffff;
            box-shadow: var(--shadow-sm);
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            color: #ffffff;
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }
        .btn-outline-light {
            background: transparent;
            color: #ffffff;
            border: 2px solid rgba(255,255,255,0.5);
        }
        .btn-outline-light:hover {
            background: rgba(255,255,255,0.1);
            border-color: #ffffff;
            color: #ffffff;
            transform: translateY(-1px);
        }
        .btn-accent {
            background: var(--accent);
            color: #1e293b;
            box-shadow: var(--shadow-sm);
        }
        .btn-accent:hover {
            background: var(--accent-hover);
            color: #1e293b;
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }
        .btn-lg {
            padding: 14px 32px;
            font-size: 1.05rem;
            border-radius: var(--radius-lg);
        }

        /* Section Common */
        .section {
            padding: 56px 28px;
        }
        .section-header {
            text-align: center;
            margin-bottom: 40px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 10px;
            letter-spacing: -0.01em;
        }
        .section-header .section-subtitle {
            font-size: 1rem;
            color: var(--text-muted);
            max-width: 560px;
            margin: 0 auto;
        }
        .section-alt {
            background: var(--surface-bg);
        }

        /* Feature Cards */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 20px;
        }
        .feature-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-xs);
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: #cbd5e1;
        }
        .feature-card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 16px;
            background: var(--primary-light);
            color: var(--primary);
            flex-shrink: 0;
        }
        .feature-card .card-icon.accent-icon {
            background: var(--accent-light);
            color: var(--accent);
        }
        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.6;
        }
        .feature-card .card-tag {
            display: inline-block;
            padding: 4px 10px;
            border-radius: 20px;
            font-size: 0.72rem;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary);
            margin-top: 12px;
            letter-spacing: 0.03em;
        }

        /* Image Feature Row */
        .feature-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .feature-row .feature-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .feature-row .feature-image img {
            width: 100%;
            height: auto;
            object-fit: cover;
            aspect-ratio: 16/10;
        }
        .feature-row .feature-text h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .feature-row .feature-text p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .feature-row .feature-checklist {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .feature-row .feature-checklist li {
            padding: 6px 0 6px 28px;
            position: relative;
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        .feature-row .feature-checklist li::before {
            content: '\f00c';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            top: 6px;
            color: var(--primary);
            font-size: 0.8rem;
        }

        /* Steps / Process */
        .steps-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 20px;
            counter-reset: step;
        }
        .step-item {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-xs);
            position: relative;
            text-align: center;
            transition: all var(--transition);
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .step-item .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #ffffff;
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 14px;
            box-shadow: 0 4px 12px rgba(79,70,229,0.3);
        }
        .step-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .step-item p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.6;
        }

        /* Stats Row */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .stat-item .stat-value {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.1;
        }
        .stat-item .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* FAQ */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-xs);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-item .faq-question {
            padding: 18px 20px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            color: var(--text);
            user-select: none;
            transition: color var(--transition-fast);
        }
        .faq-item .faq-question i {
            font-size: 0.8rem;
            color: var(--text-muted);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-item .faq-answer-inner {
            padding: 0 20px 18px;
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, #4f46e5 0%, #3730a3 100%);
            padding: 56px 28px;
            text-align: center;
            color: #ffffff;
            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;
            background-blend-mode: soft-light;
            opacity: 0.2;
            z-index: 1;
        }
        .cta-section .cta-inner {
            position: relative;
            z-index: 2;
            max-width: 640px;
            margin: 0 auto;
        }
        .cta-section h2 {
            color: #ffffff;
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255,255,255,0.8);
            font-size: 1.05rem;
            margin-bottom: 28px;
        }
        .cta-section .btn-cta {
            background: #ffffff;
            color: var(--primary);
            font-weight: 700;
            padding: 14px 36px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            font-size: 1.05rem;
        }
        .cta-section .btn-cta:hover {
            background: #f1f5f9;
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-xl);
        }

        /* Footer */
        .site-footer {
            background: #1e293b;
            color: #e2e8f0;
            padding: 48px 28px 24px;
            flex-shrink: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 32px;
            max-width: 1200px;
            margin: 0 auto;
        }
        .footer-col h4 {
            color: #ffffff;
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.55);
            font-size: 0.85rem;
            padding: 4px 0;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            max-width: 1200px;
            margin: 28px auto 0;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 0.78rem;
            color: rgba(255,255,255,0.4);
        }

        /* Responsive */
        @media (max-width: 1023px) {
            .mobile-header {
                display: flex;
            }
            .sidebar-overlay {
                display: block;
            }
            .app-sidebar {
                transform: translateX(-100%);
                top: var(--header-mobile-height);
                bottom: 0;
                height: auto;
                width: 280px;
                box-shadow: 4px 0 24px rgba(0,0,0,0.2);
            }
            .app-sidebar.open {
                transform: translateX(0);
            }
            .app-sidebar .sidebar-brand {
                display: none;
            }
            .app-sidebar .sidebar-footer {
                display: none;
            }
            .main-wrapper {
                margin-left: 0;
                padding-top: var(--header-mobile-height);
            }
            .category-hero {
                padding: 40px 20px;
            }
            .category-hero h1 {
                font-size: 1.8rem;
            }
            .category-hero .hero-desc {
                font-size: 0.95rem;
            }
            .section {
                padding: 40px 20px;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .feature-row {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .feature-row .feature-image {
                order: -1;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-item .stat-value {
                font-size: 1.8rem;
            }
            .steps-list {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .breadcrumb-bar {
                padding: 10px 16px;
                font-size: 0.8rem;
            }
            .btn {
                padding: 10px 20px;
                font-size: 0.9rem;
            }
            .btn-lg {
                padding: 12px 24px;
                font-size: 0.95rem;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 639px) {
            .category-hero h1 {
                font-size: 1.45rem;
            }
            .category-hero .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .category-hero .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .section {
                padding: 32px 14px;
            }
            .section-header h2 {
                font-size: 1.3rem;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item .stat-value {
                font-size: 1.5rem;
            }
            .steps-list {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .feature-card {
                padding: 20px 16px;
            }
            .faq-item .faq-question {
                font-size: 0.88rem;
                padding: 14px 16px;
            }
            .faq-item .faq-answer-inner {
                padding: 0 16px 14px;
                font-size: 0.82rem;
            }
            .breadcrumb-bar {
                font-size: 0.75rem;
                padding: 8px 12px;
            }
        }

/* roulang page: article */
:root {
            --color-primary: #1a6fb5;
            --color-primary-dark: #14578c;
            --color-primary-light: #e8f4fd;
            --color-accent: #0d9488;
            --color-accent-dark: #0f766e;
            --color-bg: #f7f8fa;
            --color-surface: #ffffff;
            --color-text: #1a1d23;
            --color-text-secondary: #5c6270;
            --color-text-muted: #8b919e;
            --color-border: #e2e6ed;
            --color-border-light: #eef1f5;
            --color-shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --color-shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --color-shadow-lg: 0 8px 32px rgba(0,0,0,0.10);
            --color-shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --sidebar-width: 250px;
            --topbar-height: 56px;
            --transition-fast: 0.18s ease;
            --transition-base: 0.25s ease;
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', monospace;
        }

        *, *::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: 1.65;
            color: var(--color-text);
            background: var(--color-bg);
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-primary-dark);
            text-decoration: underline;
        }
        a:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 3px;
            border-radius: 3px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        button, .btn {
            cursor: pointer;
            font-family: inherit;
            transition: all var(--transition-base);
            border: none;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            letter-spacing: 0.01em;
        }

        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: #0f1a2e;
            z-index: 900;
            display: flex;
            flex-direction: column;
            box-shadow: 2px 0 24px rgba(0,0,0,0.18);
            transition: transform var(--transition-smooth);
        }

        .sidebar-logo {
            padding: 22px 20px 18px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            flex-shrink: 0;
        }
        .sidebar-logo a {
            font-size: 1.15rem;
            font-weight: 700;
            color: #ffffff;
            letter-spacing: 0.03em;
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }
        .sidebar-logo a:hover {
            color: #c8ddf0;
            text-decoration: none;
        }
        .sidebar-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--color-primary);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: #fff;
            flex-shrink: 0;
        }

        .sidebar-nav {
            flex: 1;
            overflow-y: auto;
            padding: 12px 0;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 11px;
            padding: 11px 20px;
            color: rgba(255,255,255,0.72);
            font-size: 0.93rem;
            font-weight: 500;
            text-decoration: none;
            border-left: 3px solid transparent;
            transition: all var(--transition-fast);
            letter-spacing: 0.02em;
        }
        .sidebar-nav a:hover {
            color: #ffffff;
            background: rgba(255,255,255,0.06);
            border-left-color: rgba(255,255,255,0.3);
            text-decoration: none;
        }
        .sidebar-nav a.active {
            color: #ffffff;
            background: rgba(26,111,181,0.28);
            border-left-color: var(--color-primary);
            font-weight: 600;
        }
        .sidebar-nav a i {
            width: 18px;
            text-align: center;
            font-size: 0.95rem;
            flex-shrink: 0;
        }

        .sidebar-footer {
            padding: 14px 20px;
            border-top: 1px solid rgba(255,255,255,0.08);
            font-size: 0.75rem;
            color: rgba(255,255,255,0.4);
            flex-shrink: 0;
        }

        .main-content {
            margin-left: var(--sidebar-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .mobile-topbar {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--topbar-height);
            background: #0f1a2e;
            z-index: 950;
            align-items: center;
            padding: 0 16px;
            box-shadow: 0 2px 12px rgba(0,0,0,0.15);
        }
        .mobile-topbar .topbar-logo {
            font-weight: 700;
            color: #fff;
            font-size: 1rem;
            letter-spacing: 0.02em;
            text-decoration: none;
        }
        .mobile-topbar .hamburger {
            margin-left: auto;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.35rem;
            cursor: pointer;
            padding: 6px 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }
        .mobile-topbar .hamburger:hover {
            background: rgba(255,255,255,0.1);
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            z-index: 899;
            opacity: 0;
            transition: opacity var(--transition-smooth);
        }
        .sidebar-overlay.show {
            opacity: 1;
        }

        .article-banner {
            background: linear-gradient(135deg, rgba(15,26,46,0.82) 0%, rgba(15,26,46,0.55) 100%), url('<?php echo $bannerBg; ?>') center/cover no-repeat;
            min-height: 260px;
            display: flex;
            align-items: flex-end;
            padding: 40px 40px 32px;
            color: #ffffff;
            position: relative;
        }
        .article-banner-content {
            max-width: 800px;
            width: 100%;
        }
        .article-banner .banner-category {
            display: inline-block;
            background: var(--color-accent);
            color: #fff;
            font-size: 0.78rem;
            font-weight: 600;
            padding: 5px 14px;
            border-radius: 20px;
            letter-spacing: 0.04em;
            margin-bottom: 12px;
            text-transform: uppercase;
        }
        .article-banner h1 {
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.3;
            margin: 0;
            letter-spacing: 0.02em;
            text-shadow: 0 2px 8px rgba(0,0,0,0.35);
        }
        .article-meta-row {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
            margin-top: 12px;
            font-size: 0.88rem;
            color: rgba(255,255,255,0.8);
        }
        .article-meta-row span {
            display: flex;
            align-items: center;
            gap: 5px;
            white-space: nowrap;
        }
        .article-meta-row i {
            font-size: 0.8rem;
            opacity: 0.75;
        }

        .breadcrumb-bar {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border-light);
            padding: 12px 40px;
            font-size: 0.85rem;
            color: var(--color-text-muted);
            display: flex;
            flex-wrap: wrap;
            gap: 4px;
            align-items: center;
        }
        .breadcrumb-bar a {
            color: var(--color-text-secondary);
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        .breadcrumb-bar a:hover {
            color: var(--color-primary);
        }
        .breadcrumb-bar .sep {
            margin: 0 6px;
            color: var(--color-border);
            user-select: none;
        }
        .breadcrumb-bar .current {
            color: var(--color-text);
            font-weight: 500;
            pointer-events: none;
        }

        .article-container {
            max-width: 860px;
            margin: 0 auto;
            padding: 36px 40px 48px;
            width: 100%;
        }

        .article-featured-image {
            margin-bottom: 28px;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--color-shadow-md);
        }
        .article-featured-image img {
            width: 100%;
            border-radius: var(--radius-lg);
            transition: transform var(--transition-smooth);
        }
        .article-featured-image:hover img {
            transform: scale(1.015);
        }

        .article-body {
            font-size: 1.05rem;
            line-height: 1.8;
            color: var(--color-text);
        }
        .article-body h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 36px 0 16px;
            color: var(--color-text);
            padding-bottom: 8px;
            border-bottom: 2px solid var(--color-border-light);
            letter-spacing: 0.02em;
        }
        .article-body h3 {
            font-size: 1.22rem;
            font-weight: 600;
            margin: 28px 0 12px;
            color: var(--color-text);
        }
        .article-body h4 {
            font-size: 1.08rem;
            font-weight: 600;
            margin: 20px 0 10px;
            color: var(--color-text);
        }
        .article-body p {
            margin-bottom: 16px;
            color: var(--color-text-secondary);
        }
        .article-body ul, .article-body ol {
            margin: 14px 0 20px;
            padding-left: 24px;
            color: var(--color-text-secondary);
        }
        .article-body li {
            margin-bottom: 8px;
        }
        .article-body blockquote {
            border-left: 4px solid var(--color-primary);
            background: var(--color-primary-light);
            padding: 16px 20px;
            margin: 24px 0;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            color: var(--color-text);
            font-style: italic;
            font-size: 1.02rem;
        }
        .article-body blockquote p {
            margin: 0;
            color: inherit;
        }
        .article-body img {
            margin: 20px 0;
            border-radius: var(--radius-md);
            box-shadow: var(--color-shadow-sm);
        }
        .article-body pre {
            background: #1e293b;
            color: #e2e8f0;
            padding: 18px 20px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 20px 0;
            font-family: var(--font-mono);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .article-body code {
            background: #eef1f5;
            padding: 2px 7px;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-size: 0.88em;
            color: #c7254e;
        }
        .article-body pre code {
            background: none;
            padding: 0;
            color: inherit;
            font-size: inherit;
        }
        .article-body a {
            color: var(--color-primary);
            text-decoration: underline;
            text-decoration-thickness: 1px;
            text-underline-offset: 3px;
        }
        .article-body a:hover {
            color: var(--color-primary-dark);
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 0.95rem;
        }
        .article-body table th,
        .article-body table td {
            border: 1px solid var(--color-border);
            padding: 10px 14px;
            text-align: left;
        }
        .article-body table th {
            background: #f1f5f9;
            font-weight: 600;
            color: var(--color-text);
        }
        .article-body hr {
            border: none;
            border-top: 1px solid var(--color-border-light);
            margin: 32px 0;
        }
        .article-body strong {
            color: var(--color-text);
            font-weight: 600;
        }

        .article-not-found {
            text-align: center;
            padding: 60px 20px;
            color: var(--color-text-secondary);
        }
        .article-not-found .nf-icon {
            font-size: 3.5rem;
            color: var(--color-border);
            margin-bottom: 16px;
            display: block;
        }
        .article-not-found h3 {
            font-size: 1.35rem;
            margin-bottom: 8px;
            color: var(--color-text);
        }
        .article-not-found p {
            margin-bottom: 20px;
            color: var(--color-text-muted);
        }
        .article-not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            background: var(--color-primary);
            color: #fff;
            padding: 10px 22px;
            border-radius: var(--radius-md);
            font-weight: 600;
            text-decoration: none;
            transition: all var(--transition-base);
            font-size: 0.95rem;
        }
        .article-not-found .btn-back:hover {
            background: var(--color-primary-dark);
            transform: translateY(-1px);
            box-shadow: var(--color-shadow-md);
            text-decoration: none;
            color: #fff;
        }

        .section-related {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border-light);
            padding: 48px 40px;
        }
        .section-related .related-inner {
            max-width: 860px;
            margin: 0 auto;
        }
        .section-related .section-title {
            font-size: 1.35rem;
            font-weight: 700;
            margin-bottom: 24px;
            color: var(--color-text);
            letter-spacing: 0.02em;
        }
        .related-cards {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .related-card {
            background: var(--color-bg);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--color-shadow-sm);
            transition: all var(--transition-base);
            border: 1px solid var(--color-border-light);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--color-shadow-lg);
            border-color: var(--color-border);
        }
        .related-card .card-img {
            height: 160px;
            overflow: hidden;
            flex-shrink: 0;
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
            transition: transform var(--transition-smooth);
        }
        .related-card:hover .card-img img {
            transform: scale(1.06);
        }
        .related-card .card-body {
            padding: 16px 18px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .related-card .card-tag {
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--color-primary);
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }
        .related-card .card-title {
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--color-text);
            line-height: 1.4;
            text-decoration: none;
        }
        .related-card a {
            text-decoration: none;
            color: inherit;
        }
        .related-card a:hover {
            text-decoration: none;
        }
        .related-card a:hover .card-title {
            color: var(--color-primary);
        }

        .section-cta {
            background: linear-gradient(135deg, #0f1a2e 0%, #162544 100%);
            padding: 52px 40px;
            text-align: center;
            color: #ffffff;
        }
        .section-cta .cta-inner {
            max-width: 600px;
            margin: 0 auto;
        }
        .section-cta h2 {
            font-size: 1.55rem;
            font-weight: 700;
            margin-bottom: 12px;
            letter-spacing: 0.02em;
        }
        .section-cta p {
            color: rgba(255,255,255,0.7);
            margin-bottom: 24px;
            font-size: 1rem;
        }
        .section-cta .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--color-primary);
            color: #fff;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            text-decoration: none;
            transition: all var(--transition-base);
            letter-spacing: 0.02em;
        }
        .section-cta .btn-cta:hover {
            background: #1d82cf;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(26,111,181,0.45);
            text-decoration: none;
            color: #fff;
        }

        .site-footer {
            background: #0b1523;
            color: rgba(255,255,255,0.7);
            padding: 48px 40px 20px;
            flex-shrink: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            max-width: 1100px;
            margin: 0 auto;
        }
        .footer-col h4 {
            color: #ffffff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 14px;
            letter-spacing: 0.03em;
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.5);
            font-size: 0.85rem;
            padding: 5px 0;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: #ffffff;
            text-decoration: none;
        }
        .footer-bottom {
            max-width: 1100px;
            margin: 28px auto 0;
            padding-top: 18px;
            border-top: 1px solid rgba(255,255,255,0.08);
            font-size: 0.78rem;
            color: rgba(255,255,255,0.35);
            text-align: center;
        }

        @media (max-width: 1024px) {
            :root {
                --sidebar-width: 220px;
            }
            .article-banner h1 {
                font-size: 1.65rem;
            }
            .article-container {
                padding: 28px 28px 36px;
            }
            .related-cards {
                grid-template-columns: repeat(2, 1fr);
            }
            .section-related {
                padding: 36px 28px;
            }
            .section-cta {
                padding: 40px 28px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
                width: 270px;
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay {
                display: block;
                pointer-events: none;
            }
            .sidebar-overlay.show {
                pointer-events: auto;
            }
            .mobile-topbar {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                padding-top: var(--topbar-height);
            }
            .article-banner {
                min-height: 200px;
                padding: 24px 20px 22px;
            }
            .article-banner h1 {
                font-size: 1.35rem;
            }
            .breadcrumb-bar {
                padding: 10px 20px;
                font-size: 0.8rem;
            }
            .article-container {
                padding: 20px 16px 32px;
            }
            .article-body {
                font-size: 1rem;
            }
            .article-body h2 {
                font-size: 1.3rem;
            }
            .article-body h3 {
                font-size: 1.1rem;
            }
            .related-cards {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .section-related {
                padding: 28px 16px;
            }
            .section-cta {
                padding: 32px 16px;
            }
            .section-cta h2 {
                font-size: 1.3rem;
            }
            .site-footer {
                padding: 32px 16px 18px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .article-meta-row {
                gap: 10px;
                font-size: 0.8rem;
            }
        }

        @media (max-width: 520px) {
            .article-banner {
                min-height: 170px;
                padding: 18px 14px 16px;
            }
            .article-banner h1 {
                font-size: 1.15rem;
            }
            .article-banner .banner-category {
                font-size: 0.7rem;
                padding: 4px 10px;
            }
            .article-meta-row {
                gap: 6px;
                font-size: 0.72rem;
                flex-direction: column;
                align-items: flex-start;
            }
            .breadcrumb-bar {
                padding: 8px 14px;
                font-size: 0.75rem;
            }
            .article-container {
                padding: 16px 10px 24px;
            }
            .article-featured-image {
                border-radius: var(--radius-md);
            }
            .article-body {
                font-size: 0.95rem;
                line-height: 1.7;
            }
            .section-cta h2 {
                font-size: 1.15rem;
            }
        }