/* roulang page: index */
:root {
            --primary: #1a56db;
            --primary-dark: #1040b0;
            --primary-light: #e8f0fe;
            --accent: #0ea5e9;
            --accent-dark: #0284c7;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-dark: #0f172a;
            --bg-dark-alt: #1e293b;
            --text: #1e293b;
            --text-weak: #64748b;
            --text-light: #94a3b8;
            --text-on-dark: #e2e8f0;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12), 0 4px 12px rgba(0, 0, 0, 0.06);
            --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15), 0 8px 20px rgba(0, 0, 0, 0.08);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --container-max: 1200px;
            --nav-height: 68px;
        }

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

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

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

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

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== Header / Nav ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--bg);
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            height: var(--nav-height);
            transition: box-shadow var(--transition);
        }

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

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--nav-height);
            gap: 20px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--primary);
            white-space: nowrap;
            flex-shrink: 0;
            letter-spacing: -0.01em;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-weak);
            transition: all var(--transition);
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .main-nav a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .main-nav a.nav-cta-highlight {
            background: var(--primary);
            color: #fff;
            padding: 8px 20px;
            border-radius: 24px;
            font-weight: 600;
            margin-left: 8px;
        }
        .main-nav a.nav-cta-highlight:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: var(--shadow);
        }

        .search-box {
            display: flex;
            align-items: center;
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: 24px;
            padding: 8px 14px;
            gap: 8px;
            transition: all var(--transition);
            flex-shrink: 0;
            max-width: 200px;
        }
        .search-box:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
            background: #fff;
        }
        .search-box input {
            border: none;
            background: transparent;
            width: 100%;
            font-size: 0.9rem;
            color: var(--text);
            min-width: 0;
        }
        .search-box input::placeholder {
            color: var(--text-light);
        }
        .search-box button {
            color: var(--text-weak);
            font-size: 0.9rem;
            transition: color var(--transition);
            flex-shrink: 0;
        }
        .search-box button:hover {
            color: var(--primary);
        }

        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            z-index: 1001;
        }
        .mobile-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .mobile-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .mobile-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .mobile-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            min-height: 580px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(15, 23, 42, 0.7) 40%, rgba(26, 86, 219, 0.45) 100%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-content {
            max-width: 680px;
            padding: 60px 0;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            padding: 6px 16px;
            border-radius: 24px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 20px;
            letter-spacing: 0.02em;
        }
        .hero-badge .dot {
            width: 8px;
            height: 8px;
            background: #34d399;
            border-radius: 50%;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6);
            }
            50% {
                box-shadow: 0 0 0 10px rgba(52, 211, 153, 0);
            }
        }
        .hero h1 {
            font-size: 3rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }
        .hero h1 span {
            background: linear-gradient(135deg, #60a5fa, #38bdf8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 540px;
        }
        .hero-btns {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: 28px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 16px rgba(26, 86, 219, 0.35);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 8px 28px rgba(26, 86, 219, 0.45);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.5);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 16px rgba(14, 165, 233, 0.35);
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            box-shadow: 0 8px 28px rgba(14, 165, 233, 0.45);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
            border-radius: 20px;
        }
        .btn-ghost {
            background: transparent;
            color: var(--primary);
            border: 1px solid transparent;
        }
        .btn-ghost:hover {
            background: var(--primary-light);
            border-color: var(--primary);
        }

        /* ========== Sections ========== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-on-dark);
        }
        .section-header {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-header h2 {
            font-size: 2.1rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .section-dark .section-header h2 {
            color: #fff;
        }
        .section-header p {
            color: var(--text-weak);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto;
        }
        .section-dark .section-header p {
            color: var(--text-light);
        }

        /* ========== Feature Cards ========== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            text-align: center;
            transition: all var(--transition);
            position: relative;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .feature-card .card-icon {
            width: 60px;
            height: 60px;
            border-radius: var(--radius);
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            margin: 0 auto 18px;
            transition: all var(--transition);
        }
        .feature-card:hover .card-icon {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 8px 24px rgba(26, 86, 219, 0.3);
        }
        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text);
        }
        .feature-card p {
            color: var(--text-weak);
            font-size: 0.9rem;
            line-height: 1.6;
        }

        /* ========== Category Entry Cards ========== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(1, 1fr);
            gap: 28px;
            max-width: 800px;
            margin: 0 auto;
        }
        .category-card {
            display: flex;
            align-items: center;
            gap: 28px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px 32px;
            transition: all var(--transition);
            cursor: pointer;
        }
        .category-card:hover {
            box-shadow: var(--shadow-lg);
            border-color: transparent;
            transform: translateY(-3px);
        }
        .category-card .cat-img {
            width: 140px;
            height: 100px;
            border-radius: var(--radius);
            object-fit: cover;
            flex-shrink: 0;
        }
        .category-card .cat-info h3 {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text);
        }
        .category-card .cat-info p {
            color: var(--text-weak);
            font-size: 0.9rem;
            line-height: 1.6;
            margin-bottom: 10px;
        }
        .category-card .cat-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 12px;
            border-radius: 14px;
            font-size: 0.8rem;
            font-weight: 600;
        }

        /* ========== Stats ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .stat-card {
            text-align: center;
            padding: 32px 20px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-lg);
            transition: all var(--transition);
        }
        .stat-card:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.25);
            transform: translateY(-3px);
        }
        .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.02em;
            margin-bottom: 6px;
        }
        .stat-number span {
            background: linear-gradient(135deg, #60a5fa, #38bdf8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .stat-label {
            color: var(--text-light);
            font-size: 0.9rem;
            font-weight: 500;
        }

        /* ========== News List ========== */
        .news-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .news-item {
            display: flex;
            gap: 18px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px 22px;
            transition: all var(--transition);
            align-items: flex-start;
        }
        .news-item:hover {
            box-shadow: var(--shadow);
            border-color: transparent;
            transform: translateY(-2px);
        }
        .news-item .news-thumb {
            width: 80px;
            height: 60px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }
        .news-item .news-content {
            flex: 1;
            min-width: 0;
        }
        .news-item .news-content h4 {
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 4px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            color: var(--text);
        }
        .news-item .news-content h4 a {
            color: inherit;
        }
        .news-item .news-content h4 a:hover {
            color: var(--primary);
        }
        .news-item .news-meta {
            font-size: 0.8rem;
            color: var(--text-weak);
            display: flex;
            gap: 12px;
            align-items: center;
            flex-wrap: wrap;
        }
        .news-item .news-meta .tag-badge {
            background: var(--primary-light);
            color: var(--primary);
            padding: 2px 10px;
            border-radius: 10px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .news-empty {
            text-align: center;
            padding: 48px 20px;
            color: var(--text-weak);
            grid-column: 1 / -1;
            font-size: 0.95rem;
        }

        /* ========== Steps / Flow ========== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0;
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 12%;
            right: 12%;
            height: 2px;
            background: var(--border);
            z-index: 0;
            display: none;
        }
        @media (min-width: 769px) {
            .steps-grid::before {
                display: block;
            }
        }
        .step-item {
            text-align: center;
            position: relative;
            z-index: 1;
            padding: 0 16px;
        }
        .step-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: #fff;
            border: 3px solid var(--primary);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 700;
            margin: 0 auto 16px;
            transition: all var(--transition);
        }
        .step-item:hover .step-number {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 8px 24px rgba(26, 86, 219, 0.35);
        }
        .step-item h4 {
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text);
        }
        .step-item p {
            color: var(--text-weak);
            font-size: 0.85rem;
            line-height: 1.5;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 12px;
            overflow: hidden;
            background: #fff;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text);
            text-align: left;
            transition: all var(--transition);
            gap: 14px;
        }
        .faq-question i {
            transition: transform var(--transition);
            color: var(--text-weak);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 22px 18px;
            color: var(--text-weak);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        /* ========== CTA ========== */
        .cta-section {
            text-align: center;
            padding: 80px 0;
            background: linear-gradient(135deg, var(--bg-dark) 0%, #1a3a6b 50%, var(--bg-dark) 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(26, 86, 219, 0.25) 0%, transparent 70%);
            top: -80px;
            right: -100px;
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 28px;
            font-size: 1rem;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-section .btn-primary {
            font-size: 1rem;
            padding: 15px 36px;
            border-radius: 30px;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--bg-dark-alt);
            color: var(--text-on-dark);
            padding: 48px 0 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand .logo-link {
            color: #fff;
            font-size: 1.2rem;
            margin-bottom: 10px;
            display: inline-flex;
        }
        .footer-brand p {
            color: var(--text-light);
            font-size: 0.85rem;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            color: #fff;
            font-weight: 600;
            margin-bottom: 14px;
            font-size: 0.95rem;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            color: var(--text-light);
            font-size: 0.85rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-light);
        }

        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 28px;
            }
            .steps-grid::before {
                display: none;
            }
            .news-list {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero h1 {
                font-size: 2.4rem;
            }
            .search-box {
                max-width: 150px;
            }
        }

        @media (max-width: 768px) {
            .main-nav {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                padding: 16px 20px;
                gap: 4px;
                box-shadow: var(--shadow-lg);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.3s ease;
                border-bottom: 2px solid var(--border);
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 16px;
                border-radius: var(--radius-sm);
                font-size: 1rem;
            }
            .main-nav a.nav-cta-highlight {
                margin-left: 0;
                text-align: center;
                justify-content: center;
            }
            .search-box {
                max-width: none;
                width: 100%;
                margin-top: 8px;
            }
            .mobile-toggle {
                display: flex;
            }
            .hero {
                min-height: 440px;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .feature-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .feature-card {
                padding: 22px 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .category-card {
                flex-direction: column;
                text-align: center;
                padding: 22px 20px;
            }
            .category-card .cat-img {
                width: 100%;
                height: 140px;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .section {
                padding: 56px 0;
            }
            .section-header h2 {
                font-size: 1.7rem;
            }
            .hero-content {
                padding: 40px 0;
                text-align: center;
            }
            .hero p {
                margin-left: auto;
                margin-right: auto;
            }
            .hero-btns {
                justify-content: center;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 520px) {
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 1.7rem;
            }
            .hero {
                min-height: 380px;
            }
            .btn {
                padding: 11px 22px;
                font-size: 0.9rem;
            }
            .news-item {
                flex-direction: column;
                padding: 16px;
            }
            .news-item .news-thumb {
                width: 100%;
                height: 120px;
                border-radius: var(--radius-sm);
            }
            .container {
                padding: 0 16px;
            }
        }

/* roulang page: category1 */
:root {
            --c-primary: #1a56db;
            --c-primary-dark: #1447b3;
            --c-primary-light: #e8effd;
            --c-accent: #f59e0b;
            --c-accent-dark: #d97706;
            --c-bg: #f8fafc;
            --c-bg-alt: #f1f5f9;
            --c-surface: #ffffff;
            --c-text: #1e293b;
            --c-text-soft: #64748b;
            --c-text-weak: #94a3b8;
            --c-border: #e2e8f0;
            --c-border-light: #f1f5f9;
            --c-success: #10b981;
            --c-shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --c-shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --c-shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
            --c-shadow-xl: 0 20px 60px rgba(0,0,0,0.13);
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 9999px;
            --space-xs: 6px;
            --space-sm: 12px;
            --space-md: 20px;
            --space-lg: 32px;
            --space-xl: 48px;
            --space-2xl: 64px;
            --space-3xl: 80px;
            --font-xs: 0.75rem;
            --font-sm: 0.875rem;
            --font-base: 1rem;
            --font-md: 1.1rem;
            --font-lg: 1.25rem;
            --font-xl: 1.5rem;
            --font-2xl: 2rem;
            --font-3xl: 2.5rem;
            --font-4xl: 3rem;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1.2);
        }

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

        html { scroll-behavior: smooth; font-size: 16px; }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            line-height: 1.7;
            color: var(--c-text);
            background: var(--c-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        a { text-decoration: none; color: inherit; transition: color var(--transition-fast); }
        img { max-width: 100%; height: auto; display: block; }
        button { cursor: pointer; font-family: inherit; border: none; outline: none; }
        ul, ol { list-style: none; }
        input, select { font-family: inherit; }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--space-md);
        }

        /* ========== Header / Nav ========== */
        .site-header {
            background: var(--c-surface);
            border-bottom: 1px solid var(--c-border);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--c-shadow-sm);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: var(--space-md);
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: var(--space-xs);
            font-weight: 700;
            font-size: var(--font-lg);
            color: var(--c-text);
        }
        .logo-link:hover { color: var(--c-primary); }
        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--c-primary), #3b82f6);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: var(--space-xs);
        }
        .main-nav a {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: var(--font-sm);
            font-weight: 500;
            color: var(--c-text-soft);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .main-nav a:hover { color: var(--c-primary); background: var(--c-primary-light); }
        .main-nav a.active {
            color: var(--c-primary);
            background: var(--c-primary-light);
            font-weight: 600;
        }
        .nav-cta-highlight {
            background: var(--c-primary) !important;
            color: #fff !important;
            font-weight: 600 !important;
            padding: 9px 20px !important;
            border-radius: var(--radius-full) !important;
            transition: all var(--transition-base) !important;
        }
        .nav-cta-highlight:hover {
            background: var(--c-primary-dark) !important;
            color: #fff !important;
            box-shadow: 0 4px 14px rgba(26,86,219,0.35);
            transform: translateY(-1px);
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            font-size: 1.5rem;
            color: var(--c-text);
            padding: 6px;
            border-radius: var(--radius-sm);
        }
        @media (max-width: 768px) {
            .main-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--c-surface); flex-direction: column; padding: var(--space-md); border-bottom: 2px solid var(--c-border); box-shadow: var(--c-shadow-lg); gap: 4px; z-index: 999; }
            .main-nav.open { display: flex; }
            .main-nav a { width: 100%; padding: 12px 16px; border-radius: var(--radius-sm); }
            .mobile-menu-btn { display: block; }
            .header-inner { height: 56px; }
        }

        /* ========== Category Banner ========== */
        .category-banner {
            position: relative;
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 40%, #1a56db 100%);
            padding: var(--space-3xl) 0 var(--space-2xl);
            overflow: hidden;
            color: #fff;
        }
        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.12;
            z-index: 0;
        }
        .category-banner .container { position: relative; z-index: 1; }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: var(--font-sm);
            color: rgba(255,255,255,0.7);
            margin-bottom: var(--space-lg);
            flex-wrap: wrap;
        }
        .breadcrumb a { color: rgba(255,255,255,0.85); }
        .breadcrumb a:hover { color: #fff; text-decoration: underline; }
        .breadcrumb .sep { opacity: 0.5; }
        .breadcrumb .current { color: #fff; font-weight: 500; }
        .category-banner-content h1 {
            font-size: var(--font-4xl);
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: var(--space-sm);
            line-height: 1.2;
        }
        .category-banner-content .cat-desc {
            font-size: var(--font-md);
            color: rgba(255,255,255,0.8);
            max-width: 640px;
            line-height: 1.6;
        }
        .category-stats {
            display: flex;
            gap: var(--space-lg);
            margin-top: var(--space-lg);
            flex-wrap: wrap;
        }
        .cat-stat-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: var(--font-sm);
            color: rgba(255,255,255,0.8);
        }
        .cat-stat-item .stat-num {
            font-size: var(--font-2xl);
            font-weight: 700;
            color: #fff;
            line-height: 1;
        }
        .cat-stat-item .stat-icon {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-md);
            background: rgba(255,255,255,0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
        }
        @media (max-width: 768px) {
            .category-banner { padding: var(--space-2xl) 0 var(--space-xl); }
            .category-banner-content h1 { font-size: var(--font-2xl); }
            .category-banner-content .cat-desc { font-size: var(--font-base); }
            .category-stats { gap: var(--space-md); }
            .cat-stat-item .stat-num { font-size: var(--font-xl); }
        }

        /* ========== Main Layout ========== */
        .category-main {
            flex: 1;
            padding: var(--space-2xl) 0 var(--space-3xl);
        }
        .category-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: var(--space-xl);
            align-items: start;
        }
        @media (max-width: 900px) {
            .category-layout { grid-template-columns: 1fr; }
        }

        /* ========== Toolbar ========== */
        .articles-toolbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-md);
            margin-bottom: var(--space-lg);
            flex-wrap: wrap;
            background: var(--c-surface);
            padding: var(--space-sm) var(--space-md);
            border-radius: var(--radius-md);
            border: 1px solid var(--c-border);
        }
        .articles-count {
            font-size: var(--font-sm);
            color: var(--c-text-soft);
            font-weight: 500;
        }
        .articles-count strong { color: var(--c-primary); }
        .sort-select {
            padding: 8px 32px 8px 14px;
            border: 1px solid var(--c-border);
            border-radius: var(--radius-sm);
            font-size: var(--font-sm);
            color: var(--c-text);
            background: var(--c-bg);
            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'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 10px center;
            cursor: pointer;
            transition: border-color var(--transition-fast);
        }
        .sort-select:focus { border-color: var(--c-primary); outline: 2px solid var(--c-primary-light); outline-offset: 1px; }

        /* ========== Article Cards ========== */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-md);
            margin-bottom: var(--space-xl);
        }
        @media (max-width: 640px) {
            .articles-grid { grid-template-columns: 1fr; }
        }
        .article-card {
            background: var(--c-surface);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--c-border);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .article-card:hover {
            box-shadow: var(--c-shadow-lg);
            border-color: var(--c-primary-light);
            transform: translateY(-2px);
        }
        .article-card-img {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: var(--c-bg-alt);
        }
        .article-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .article-card:hover .article-card-img img { transform: scale(1.04); }
        .article-card-tags {
            position: absolute;
            top: 12px;
            left: 12px;
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }
        .article-tag {
            padding: 4px 10px;
            border-radius: var(--radius-full);
            font-size: var(--font-xs);
            font-weight: 600;
            background: rgba(255,255,255,0.92);
            color: var(--c-primary);
            backdrop-filter: blur(4px);
        }
        .article-card-body {
            padding: var(--space-md);
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .article-card-body h3 {
            font-size: var(--font-md);
            font-weight: 700;
            color: var(--c-text);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-card-body h3 a { color: inherit; }
        .article-card-body h3 a:hover { color: var(--c-primary); }
        .article-card-excerpt {
            font-size: var(--font-sm);
            color: var(--c-text-soft);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }
        .article-card-meta {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: var(--font-xs);
            color: var(--c-text-weak);
            padding-top: 8px;
            border-top: 1px solid var(--c-border-light);
        }
        .article-card-meta .meta-dot {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--c-border);
        }
        .read-more-link {
            font-size: var(--font-sm);
            font-weight: 600;
            color: var(--c-primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--transition-fast);
        }
        .read-more-link:hover { gap: 8px; color: var(--c-primary-dark); }
        .read-more-link i { font-size: 0.7rem; }

        /* ========== Pagination ========== */
        .pagination {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .pagination a, .pagination span {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 38px;
            height: 38px;
            padding: 0 12px;
            border-radius: var(--radius-sm);
            font-size: var(--font-sm);
            font-weight: 500;
            border: 1px solid var(--c-border);
            background: var(--c-surface);
            color: var(--c-text);
            transition: all var(--transition-fast);
        }
        .pagination a:hover {
            background: var(--c-primary-light);
            border-color: var(--c-primary);
            color: var(--c-primary);
        }
        .pagination .current {
            background: var(--c-primary);
            color: #fff;
            border-color: var(--c-primary);
            font-weight: 600;
            box-shadow: 0 2px 8px rgba(26,86,219,0.3);
        }
        .pagination .disabled {
            opacity: 0.4;
            pointer-events: none;
        }

        /* ========== Sidebar ========== */
        .category-sidebar { display: flex; flex-direction: column; gap: var(--space-md); }
        @media (max-width: 900px) {
            .category-sidebar { display: none; }
        }
        .sidebar-card {
            background: var(--c-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--c-border);
            padding: var(--space-md);
        }
        .sidebar-card h4 {
            font-size: var(--font-base);
            font-weight: 700;
            color: var(--c-text);
            margin-bottom: var(--space-sm);
            padding-bottom: var(--space-sm);
            border-bottom: 2px solid var(--c-primary-light);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h4 i { color: var(--c-primary); font-size: 0.9rem; }
        .sidebar-tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-tag {
            padding: 6px 14px;
            border-radius: var(--radius-full);
            font-size: var(--font-xs);
            font-weight: 500;
            background: var(--c-bg-alt);
            color: var(--c-text-soft);
            transition: all var(--transition-fast);
            border: 1px solid transparent;
        }
        .sidebar-tag:hover {
            background: var(--c-primary-light);
            color: var(--c-primary);
            border-color: var(--c-primary);
        }
        .sidebar-hot-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--c-border-light);
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }
        .sidebar-hot-list li:last-child { border-bottom: none; }
        .hot-rank {
            width: 24px;
            height: 24px;
            border-radius: var(--radius-sm);
            background: var(--c-bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: var(--font-xs);
            font-weight: 700;
            color: var(--c-text-weak);
            flex-shrink: 0;
        }
        .sidebar-hot-list li:nth-child(1) .hot-rank,
        .sidebar-hot-list li:nth-child(2) .hot-rank,
        .sidebar-hot-list li:nth-child(3) .hot-rank {
            background: var(--c-primary);
            color: #fff;
        }
        .sidebar-hot-list li a {
            font-size: var(--font-sm);
            font-weight: 500;
            color: var(--c-text);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .sidebar-hot-list li a:hover { color: var(--c-primary); }

        /* ========== FAQ Section ========== */
        .section-faq {
            padding: var(--space-2xl) 0;
            background: var(--c-surface);
            border-top: 1px solid var(--c-border);
        }
        .section-title {
            text-align: center;
            margin-bottom: var(--space-xl);
        }
        .section-title h2 {
            font-size: var(--font-2xl);
            font-weight: 800;
            color: var(--c-text);
            margin-bottom: 8px;
        }
        .section-title p {
            font-size: var(--font-base);
            color: var(--c-text-soft);
            max-width: 500px;
            margin: 0 auto;
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }
        .faq-item {
            background: var(--c-bg);
            border-radius: var(--radius-md);
            border: 1px solid var(--c-border);
            overflow: hidden;
            transition: all var(--transition-base);
        }
        .faq-item:hover { border-color: var(--c-primary-light); }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--space-md);
            background: none;
            font-size: var(--font-base);
            font-weight: 600;
            color: var(--c-text);
            text-align: left;
            gap: var(--space-sm);
        }
        .faq-question i {
            color: var(--c-primary);
            font-size: 0.85rem;
            transition: transform var(--transition-base);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 var(--space-md) var(--space-md);
            font-size: var(--font-sm);
            color: var(--c-text-soft);
            line-height: 1.7;
        }

        /* ========== CTA Section ========== */
        .section-cta {
            padding: var(--space-3xl) 0;
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1a56db 100%);
            position: relative;
            overflow: hidden;
            color: #fff;
            text-align: center;
        }
        .section-cta::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center/cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .section-cta .container { position: relative; z-index: 1; }
        .section-cta h2 {
            font-size: var(--font-2xl);
            font-weight: 800;
            margin-bottom: var(--space-sm);
        }
        .section-cta p {
            font-size: var(--font-md);
            color: rgba(255,255,255,0.8);
            max-width: 560px;
            margin: 0 auto var(--space-lg);
        }
        .cta-buttons {
            display: flex;
            gap: var(--space-sm);
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            font-size: var(--font-base);
            font-weight: 600;
            background: #fff;
            color: var(--c-primary);
            transition: all var(--transition-base);
            box-shadow: 0 6px 24px rgba(0,0,0,0.2);
        }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(0,0,0,0.3); color: var(--c-primary-dark); }
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            font-size: var(--font-base);
            font-weight: 600;
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.5);
            transition: all var(--transition-base);
        }
        .btn-outline-light:hover {
            background: rgba(255,255,255,0.12);
            border-color: #fff;
            transform: translateY(-2px);
        }

        /* ========== Footer ========== */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: var(--space-2xl) 0 var(--space-lg);
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: var(--space-xl);
            margin-bottom: var(--space-xl);
        }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
        }
        .footer-brand .logo-link { color: #fff; margin-bottom: var(--space-sm); display: inline-flex; }
        .footer-brand p { font-size: var(--font-sm); line-height: 1.7; color: #94a3b8; max-width: 360px; }
        .footer-col h4 {
            font-size: var(--font-sm);
            font-weight: 700;
            color: #fff;
            margin-bottom: var(--space-sm);
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .footer-col ul { display: flex; flex-direction: column; gap: 8px; }
        .footer-col ul li a { font-size: var(--font-sm); color: #94a3b8; transition: color var(--transition-fast); }
        .footer-col ul li a:hover { color: #fff; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: var(--space-md);
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: var(--font-xs);
            color: #64748b;
            flex-wrap: wrap;
            gap: var(--space-xs);
        }
        @media (max-width: 520px) {
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ========== Utility ========== */
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
        @media (max-width: 520px) {
            .section-cta h2 { font-size: var(--font-xl); }
            .btn-primary, .btn-outline-light { padding: 12px 24px; font-size: var(--font-sm); }
            .articles-toolbar { flex-direction: column; align-items: flex-start; }
        }

/* roulang page: article */
:root {
            --primary: #0f2b46;
            --primary-light: #1a4065;
            --primary-dark: #0a1f33;
            --accent: #e8a817;
            --accent-hover: #c98e14;
            --accent-light: #fdf3d7;
            --blue-accent: #2563eb;
            --blue-accent-hover: #1d4ed8;
            --bg-page: #f6f8fb;
            --bg-white: #ffffff;
            --bg-light: #f1f5f9;
            --bg-card: #ffffff;
            --text-primary: #1e293b;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #ffffff;
            --border-light: #e2e8f0;
            --border-medium: #cbd5e1;
            --shadow-sm: 0 1px 2px rgba(15, 43, 70, 0.04);
            --shadow-md: 0 4px 12px rgba(15, 43, 70, 0.07);
            --shadow-lg: 0 8px 28px rgba(15, 43, 70, 0.10);
            --shadow-xl: 0 16px 48px rgba(15, 43, 70, 0.13);
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 14px;
            --radius-xl: 18px;
            --radius-full: 50%;
            --transition-fast: 0.18s ease;
            --transition-base: 0.28s ease;
            --transition-slow: 0.4s ease;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'Consolas', 'Monaco', monospace;
            --max-width: 1200px;
            --max-width-article: 820px;
            --nav-height: 68px;
        }

        *,
        *::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-primary);
            background: var(--bg-page);
            min-height: 100vh;
        }

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

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

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

        input {
            font-family: inherit;
            outline: none;
        }

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

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

        p {
            margin: 0 0 1em;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .container-narrow {
            width: 100%;
            max-width: var(--max-width-article);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Navigation */
        .site-header {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            position: sticky;
            top: 0;
            z-index: 1000;
            height: var(--nav-height);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--nav-height);
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

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

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--primary);
            font-weight: 700;
            font-size: 1.2rem;
            letter-spacing: 0.5px;
            transition: opacity var(--transition-fast);
            white-space: nowrap;
        }

        .logo-link:hover {
            opacity: 0.85;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            flex-shrink: 0;
            box-shadow: 0 2px 8px rgba(15, 43, 70, 0.18);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .main-nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .main-nav a:hover {
            color: var(--primary);
            background: var(--bg-light);
        }

        .main-nav a.active {
            color: var(--primary);
            background: #eef3fa;
            font-weight: 600;
        }

        .main-nav a.nav-cta-highlight {
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 600;
            padding: 9px 22px;
            border-radius: var(--radius-md);
            margin-left: 8px;
            box-shadow: 0 2px 8px rgba(232, 168, 23, 0.3);
            transition: all var(--transition-fast);
        }

        .main-nav a.nav-cta-highlight:hover {
            background: var(--accent-hover);
            box-shadow: 0 4px 16px rgba(232, 168, 23, 0.4);
            transform: translateY(-1px);
            color: var(--primary-dark);
        }

        /* Mobile Nav Toggle */
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            padding: 6px;
            cursor: pointer;
            line-height: 1;
        }

        /* Article Banner */
        .article-banner {
            background: linear-gradient(170deg, var(--primary) 0%, var(--primary-light) 50%, #1e5080 100%);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            padding: 56px 0 48px;
            color: var(--text-white);
            position: relative;
        }

        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(15, 43, 70, 0.82) 0%, rgba(15, 43, 70, 0.7) 100%);
        }

        .article-banner .container-narrow {
            position: relative;
            z-index: 1;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 20px;
        }

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

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

        .breadcrumb .separator {
            color: rgba(255, 255, 255, 0.45);
            font-size: 0.7rem;
        }

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

        .article-banner .article-category-tag {
            display: inline-block;
            background: var(--accent);
            color: var(--primary-dark);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 16px;
            letter-spacing: 0.4px;
        }

        .article-banner h1 {
            font-size: 2.2rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
            line-height: 1.35;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
        }

        .article-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta i {
            font-size: 0.85rem;
        }

        /* Article Content Section */
        .article-content-section {
            padding: 48px 0 40px;
        }

        .article-body {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 44px 48px;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
        }

        .article-featured-image {
            margin: -44px -48px 36px;
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
            overflow: hidden;
        }

        .article-featured-image img {
            width: 100%;
            height: auto;
            display: block;
            max-height: 460px;
            object-fit: cover;
        }

        .article-body .content-text {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-primary);
            word-wrap: break-word;
            overflow-wrap: break-word;
        }

        .article-body .content-text h2 {
            font-size: 1.55rem;
            font-weight: 700;
            margin: 36px 0 14px;
            color: var(--primary);
            padding-bottom: 8px;
            border-bottom: 2px solid var(--border-light);
        }

        .article-body .content-text h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin: 28px 0 10px;
            color: var(--primary-light);
        }

        .article-body .content-text p {
            margin-bottom: 1.2em;
            color: var(--text-primary);
        }

        .article-body .content-text ul,
        .article-body .content-text ol {
            margin: 0 0 1.2em;
            padding-left: 24px;
        }

        .article-body .content-text ul {
            list-style: disc;
        }

        .article-body .content-text ol {
            list-style: decimal;
        }

        .article-body .content-text li {
            margin-bottom: 0.5em;
            line-height: 1.75;
        }

        .article-body .content-text blockquote {
            margin: 24px 0;
            padding: 18px 24px;
            border-left: 4px solid var(--accent);
            background: var(--accent-light);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--text-secondary);
        }

        .article-body .content-text img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-md);
            margin: 20px 0;
        }

        .article-body .content-text code {
            background: var(--bg-light);
            padding: 2px 8px;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-size: 0.9em;
            color: var(--primary);
        }

        .article-body .content-text pre {
            background: var(--primary-dark);
            color: #e2e8f0;
            padding: 20px 24px;
            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 .content-text pre code {
            background: none;
            color: inherit;
            padding: 0;
        }

        /* Article Footer Info */
        .article-footer-info {
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }

        .article-tags {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }

        .article-tags .tag-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        .article-tags .tag {
            display: inline-block;
            background: var(--bg-light);
            color: var(--text-secondary);
            font-size: 0.8rem;
            padding: 5px 12px;
            border-radius: 16px;
            transition: all var(--transition-fast);
            border: 1px solid transparent;
        }

        .article-tags .tag:hover {
            background: var(--accent-light);
            color: var(--primary);
            border-color: var(--accent);
        }

        .article-share {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .article-share .share-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        .article-share .share-btn {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-full);
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--bg-light);
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            font-size: 0.9rem;
            border: 1px solid transparent;
        }

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

        /* Related Posts */
        .related-section {
            padding: 32px 0 56px;
        }

        .related-section .section-label {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            color: var(--accent);
            font-weight: 600;
            margin-bottom: 8px;
        }

        .related-section .section-title {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 28px;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

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

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

        .related-card .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: var(--bg-light);
        }

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

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

        .related-card .card-body {
            padding: 16px 18px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .related-card .card-cat {
            font-size: 0.75rem;
            color: var(--accent);
            font-weight: 600;
            letter-spacing: 0.4px;
            margin-bottom: 6px;
        }

        .related-card .card-title {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.4;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card .card-date {
            font-size: 0.78rem;
            color: var(--text-muted);
            margin-top: auto;
        }

        .related-empty {
            text-align: center;
            padding: 40px;
            color: var(--text-muted);
            font-size: 0.95rem;
            grid-column: 1 / -1;
        }

        /* CTA Section */
        .cta-section {
            padding: 56px 0 60px;
            background: linear-gradient(160deg, var(--primary) 0%, var(--primary-light) 100%);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(15, 43, 70, 0.78);
        }

        .cta-section .container-narrow {
            position: relative;
            z-index: 1;
            text-align: center;
        }

        .cta-section h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 28px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

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

        .btn-cta-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 600;
            font-size: 1rem;
            padding: 14px 30px;
            border-radius: var(--radius-md);
            transition: all var(--transition-fast);
            box-shadow: 0 4px 16px rgba(232, 168, 23, 0.35);
            border: none;
            cursor: pointer;
        }

        .btn-cta-primary:hover {
            background: var(--accent-hover);
            box-shadow: 0 6px 24px rgba(232, 168, 23, 0.5);
            transform: translateY(-2px);
            color: var(--primary-dark);
        }

        .btn-cta-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: #ffffff;
            font-weight: 600;
            font-size: 1rem;
            padding: 14px 30px;
            border-radius: var(--radius-md);
            border: 2px solid rgba(255, 255, 255, 0.45);
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .btn-cta-secondary:hover {
            border-color: #ffffff;
            background: rgba(255, 255, 255, 0.08);
            color: #ffffff;
            transform: translateY(-2px);
        }

        /* Error State */
        .error-section {
            padding: 80px 0;
            text-align: center;
        }

        .error-section .error-icon {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .error-section h2 {
            font-size: 1.6rem;
            color: var(--primary);
            margin-bottom: 10px;
        }

        .error-section p {
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            background: var(--primary);
            color: #ffffff;
            font-weight: 600;
            padding: 12px 26px;
            border-radius: var(--radius-md);
            transition: all var(--transition-fast);
        }

        .btn-back:hover {
            background: var(--primary-light);
            color: #ffffff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        /* Footer */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 48px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 36px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .footer-brand .logo-link {
            color: #ffffff;
            font-size: 1.15rem;
            margin-bottom: 12px;
            display: inline-flex;
        }

        .footer-brand .logo-icon {
            background: var(--accent);
            color: var(--primary-dark);
        }

        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.6;
            margin-top: 10px;
        }

        .footer-col h4 {
            color: #ffffff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }

        .footer-col ul li {
            margin-bottom: 8px;
        }

        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            transition: color var(--transition-fast);
        }

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

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
            padding-top: 20px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.45);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .article-banner h1 {
                font-size: 1.8rem;
            }
            .article-body {
                padding: 32px 28px;
            }
            .article-featured-image {
                margin: -32px -28px 28px;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                padding: 0 16px;
            }
            .main-nav {
                gap: 2px;
            }
            .main-nav a {
                padding: 7px 12px;
                font-size: 0.85rem;
            }
            .main-nav a.nav-cta-highlight {
                padding: 7px 16px;
                font-size: 0.85rem;
                margin-left: 4px;
            }
            .logo-link {
                font-size: 1rem;
                gap: 7px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 0.95rem;
            }
            .article-banner {
                padding: 40px 0 36px;
            }
            .article-banner h1 {
                font-size: 1.5rem;
            }
            .article-meta {
                font-size: 0.82rem;
                gap: 12px;
            }
            .article-body {
                padding: 24px 20px;
            }
            .article-featured-image {
                margin: -24px -20px 22px;
                border-radius: var(--radius-md) var(--radius-md) 0 0;
            }
            .article-body .content-text {
                font-size: 1rem;
            }
            .article-body .content-text h2 {
                font-size: 1.3rem;
            }
            .article-body .content-text h3 {
                font-size: 1.1rem;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .related-section .section-title {
                font-size: 1.3rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .cta-section h2 {
                font-size: 1.4rem;
            }
            .article-footer-info {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 520px) {
            .nav-toggle {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 20px;
                box-shadow: var(--shadow-lg);
                gap: 4px;
                transform: translateY(-120%);
                opacity: 0;
                transition: all var(--transition-base);
                pointer-events: none;
                border-bottom: 2px solid var(--border-light);
            }
            .main-nav.nav-open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 16px;
                border-radius: var(--radius-sm);
                font-size: 0.95rem;
            }
            .main-nav a.nav-cta-highlight {
                margin-left: 0;
                text-align: center;
                margin-top: 4px;
            }
            .header-inner {
                padding: 0 14px;
            }
            .article-banner h1 {
                font-size: 1.3rem;
            }
            .breadcrumb {
                font-size: 0.78rem;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .article-body {
                padding: 18px 14px;
                border-radius: var(--radius-md);
            }
            .article-featured-image {
                margin: -18px -14px 18px;
                border-radius: var(--radius-sm) var(--radius-sm) 0 0;
            }
            .btn-cta-primary,
            .btn-cta-secondary {
                padding: 12px 22px;
                font-size: 0.9rem;
                width: 100%;
                justify-content: center;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: stretch;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .article-footer-info {
                gap: 12px;
            }
        }