/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #4f46e5;
            --primary-light: #6366f1;
            --primary-dark: #3730a3;
            --primary-bg: #eef2ff;
            --secondary: #0ea5e9;
            --secondary-light: #38bdf8;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --success: #10b981;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #ffffff;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-dark: #0f172a;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 16px;
            --radius-sm: 8px;
            --radius-lg: 24px;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-hover: 0 12px 40px rgba(0,0,0,0.10);
            --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --container: 1200px;
            --nav-height: 72px;
            --spacing-section: 100px;
            --spacing-block: 64px;
        }

        /* ===== Reset / Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        img { max-width: 100%; height: auto; display: block; }
        a { text-decoration: none; color: inherit; transition: color var(--transition); }
        a:hover { color: var(--primary); }
        button, input, textarea, select { font-family: inherit; font-size: inherit; border: none; outline: none; }
        button { cursor: pointer; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text); }
        h1 { font-size: clamp(2.4rem, 5vw, 3.8rem); letter-spacing: -0.02em; }
        h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); letter-spacing: -0.01em; }
        h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
        h4 { font-size: 1.15rem; }
        p { margin-bottom: 1rem; color: var(--text-light); }
        .container {
            width: 100%;
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--text-white);
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: var(--text-white);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(79,70,229,0.35);
        }
        .btn-primary:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; }
        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-secondary:hover {
            background: var(--primary);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        .btn-secondary:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; }
        .btn-light {
            background: rgba(255,255,255,0.15);
            color: var(--text-white);
            border-color: rgba(255,255,255,0.3);
            backdrop-filter: blur(4px);
        }
        .btn-light:hover {
            background: rgba(255,255,255,0.25);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        .btn-accent {
            background: var(--accent);
            color: #1e293b;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-light);
            border-color: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(245,158,11,0.35);
        }
        .btn-lg { padding: 16px 40px; font-size: 1.05rem; }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; }

        /* ===== 标签 / 徽章 ===== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            background: var(--primary-bg);
            color: var(--primary);
        }
        .badge-accent {
            background: #fef3c7;
            color: #b45309;
        }
        .badge-success {
            background: #d1fae5;
            color: #065f46;
        }
        .badge-white {
            background: rgba(255,255,255,0.2);
            color: var(--text-white);
            backdrop-filter: blur(4px);
        }
        .tag {
            display: inline-block;
            padding: 3px 12px;
            border-radius: var(--radius-sm);
            font-size: 0.8rem;
            font-weight: 500;
            background: var(--bg-alt);
            color: var(--text-light);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .tag:hover { background: var(--primary-bg); color: var(--primary); border-color: var(--primary); }

        /* ===== 分隔线 ===== */
        .divider {
            width: 60px;
            height: 4px;
            border-radius: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            margin: 16px 0 24px;
        }
        .divider-center { margin: 16px auto 24px; }

        /* ===== Header / 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--nav-height);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            z-index: 1000;
            transition: all var(--transition);
        }
        .site-header.scrolled { box-shadow: var(--shadow); }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        .header-left {
            display: flex;
            align-items: center;
            gap: 40px;
        }
        .logo {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--primary-dark);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .logo i { font-size: 1.1rem; color: var(--primary); }
        .logo span { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.92rem;
            color: var(--text);
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a:hover { color: var(--primary); background: var(--primary-bg); }
        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
        }
        .header-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .header-right .btn { padding: 8px 20px; font-size: 0.88rem; }
        .mobile-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--text);
            padding: 4px;
            background: none;
            border: none;
            cursor: pointer;
        }
        .mobile-toggle:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 4px; }

        /* ===== Hero 分屏 ===== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding-top: var(--nav-height);
            background: var(--bg-alt);
            position: relative;
            overflow: hidden;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            width: 100%;
            max-width: var(--container);
            margin: 0 auto;
            padding: 60px 24px;
        }
        .hero-content { position: relative; z-index: 2; }
        .hero-content .badge { margin-bottom: 16px; }
        .hero-content h1 {
            margin-bottom: 20px;
            background: linear-gradient(135deg, var(--text) 40%, var(--primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-content p {
            font-size: 1.1rem;
            color: var(--text-light);
            max-width: 520px;
            margin-bottom: 32px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-visual {
            position: relative;
            z-index: 1;
            border-radius: var(--radius-lg);
            overflow: hidden;
            min-height: 420px;
            background: url('/assets/images/backpic/back-1.png') center / cover no-repeat;
            box-shadow: var(--shadow-lg);
        }
        .hero-visual::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(79,70,229,0.3), rgba(14,165,233,0.2));
            pointer-events: none;
        }
        .hero-visual-inner {
            position: relative;
            z-index: 1;
            padding: 48px;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            height: 100%;
            min-height: 420px;
        }
        .hero-visual-inner .badge-white { align-self: flex-start; margin-bottom: 12px; }
        .hero-visual-inner h3 { color: var(--text-white); font-size: 1.6rem; text-shadow: 0 2px 12px rgba(0,0,0,0.3); }
        .hero-visual-inner p { color: rgba(255,255,255,0.85); font-size: 0.95rem; max-width: 360px; }

        /* ===== 板块通用 ===== */
        .section { padding: var(--spacing-section) 0; }
        .section-alt { background: var(--bg-alt); }
        .section-dark { background: var(--bg-dark); color: var(--text-white); }
        .section-dark h2, .section-dark h3, .section-dark p { color: var(--text-white); }
        .section-dark p { color: rgba(255,255,255,0.7); }
        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto var(--spacing-block);
        }
        .section-header h2 { margin-bottom: 12px; }
        .section-header p { font-size: 1.05rem; }
        .section-header .divider-center { margin-top: 12px; margin-bottom: 16px; }

        /* ===== 核心优势卡片 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 36px 28px;
            border: 1px solid var(--border);
            transition: all var(--transition);
            box-shadow: var(--shadow);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-bg);
        }
        .feature-card .icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 20px;
            transition: all var(--transition);
        }
        .feature-card:hover .icon { background: var(--primary); color: var(--text-white); }
        .feature-card h3 { margin-bottom: 10px; }
        .feature-card p { font-size: 0.95rem; margin-bottom: 0; }

        /* ===== 平台介绍 ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            background: url('/assets/images/coverpic/cover-2.png') center / cover no-repeat;
            min-height: 380px;
        }
        .intro-text h2 { margin-bottom: 16px; }
        .intro-text .divider { margin-bottom: 20px; }
        .intro-text p { margin-bottom: 16px; }
        .intro-list { margin-top: 20px; }
        .intro-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 8px 0;
            font-size: 0.95rem;
            color: var(--text);
        }
        .intro-list li i { color: var(--success); font-size: 1.1rem; margin-top: 2px; flex-shrink: 0; }

        /* ===== 分类入口 ===== */
        .category-card-wrap {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
            max-width: 700px;
            margin: 0 auto;
        }
        .category-card {
            background: var(--bg);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 32px 28px;
            text-align: center;
            transition: all var(--transition);
            box-shadow: var(--shadow);
            position: relative;
            overflow: hidden;
        }
        .category-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .category-card:hover::before { opacity: 1; }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .category-card .icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 16px;
            border-radius: 50%;
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
        }
        .category-card h3 { margin-bottom: 8px; }
        .category-card p { font-size: 0.9rem; margin-bottom: 16px; }
        .category-card .btn { margin-top: 4px; }

        /* ===== 最新资讯 (CMS) ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .news-card {
            background: var(--bg);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .news-card .thumb {
            width: 100%;
            height: 200px;
            background: var(--bg-alt) center / cover no-repeat;
            position: relative;
        }
        .news-card .thumb .badge {
            position: absolute;
            top: 12px;
            left: 12px;
        }
        .news-card .body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card .body h3 {
            font-size: 1.05rem;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .news-card .body h3 a { color: var(--text); }
        .news-card .body h3 a:hover { color: var(--primary); }
        .news-card .body p {
            font-size: 0.9rem;
            margin-bottom: 12px;
            flex: 1;
        }
        .news-card .meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.82rem;
            color: var(--text-light);
            border-top: 1px solid var(--border-light);
            padding-top: 12px;
            margin-top: auto;
        }
        .news-card .meta span { display: flex; align-items: center; gap: 4px; }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            background: var(--bg-alt);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
        }
        .news-empty i { font-size: 2.4rem; color: var(--text-light); margin-bottom: 12px; }
        .news-empty p { font-size: 1rem; margin-bottom: 0; }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .stat-item {
            text-align: center;
            padding: 32px 16px;
            background: rgba(255,255,255,0.06);
            border-radius: var(--radius);
            border: 1px solid rgba(255,255,255,0.08);
            backdrop-filter: blur(4px);
            transition: all var(--transition);
        }
        .stat-item:hover { background: rgba(255,255,255,0.1); transform: translateY(-2px); }
        .stat-item .num {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .stat-item .num i { color: var(--accent); font-size: 1.8rem; }
        .stat-item .label { font-size: 0.9rem; color: rgba(255,255,255,0.6); }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-bg); box-shadow: var(--shadow); }
        .faq-question {
            padding: 20px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text);
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            gap: 12px;
        }
        .faq-question:focus-visible { outline: 3px solid var(--primary); outline-offset: -3px; }
        .faq-question i { color: var(--primary); font-size: 1.1rem; transition: transform var(--transition); flex-shrink: 0; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px 20px;
            font-size: 0.95rem;
            color: var(--text-light);
            display: none;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center / cover no-repeat;
            opacity: 0.1;
            pointer-events: none;
        }
        .cta-section .container { position: relative; z-index: 1; }
        .cta-section h2 { color: var(--text-white); margin-bottom: 12px; }
        .cta-section p { color: rgba(255,255,255,0.8); font-size: 1.05rem; max-width: 560px; margin: 0 auto 28px; }
        .cta-section .btn-light { font-size: 1rem; padding: 14px 36px; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-white);
            padding: 60px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            margin-bottom: 24px;
        }
        .footer-brand .logo { color: var(--text-white); margin-bottom: 12px; }
        .footer-brand .logo span { background: linear-gradient(135deg, #a5b4fc, #38bdf8); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.5); max-width: 300px; }
        .footer-col h4 { color: var(--text-white); font-size: 0.95rem; margin-bottom: 16px; font-weight: 600; }
        .footer-col a {
            display: block;
            padding: 4px 0;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.5);
            transition: all var(--transition);
        }
        .footer-col a:hover { color: var(--text-white); padding-left: 4px; }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.35);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a { color: rgba(255,255,255,0.35); }
        .footer-bottom a:hover { color: var(--text-white); }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .hero-grid { gap: 40px; padding: 40px 24px; }
            .features-grid { gap: 20px; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }

        @media (max-width: 768px) {
            :root { --spacing-section: 60px; --spacing-block: 40px; --nav-height: 64px; }

            .mobile-toggle { display: block; }
            .nav-list {
                display: none;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                width: 100%;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px 24px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow);
            }
            .nav-list.open { display: flex; }
            .nav-list a { padding: 12px 16px; width: 100%; }
            .nav-list a.active::after { display: none; }

            .hero-grid { grid-template-columns: 1fr; gap: 32px; padding: 32px 24px; }
            .hero { min-height: auto; }
            .hero-visual { min-height: 300px; }
            .hero-visual-inner { min-height: 300px; padding: 32px; }

            .features-grid { grid-template-columns: 1fr; gap: 16px; }
            .intro-grid { grid-template-columns: 1fr; gap: 32px; }
            .intro-image { min-height: 260px; }
            .category-card-wrap { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; gap: 16px; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }

            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }

            .header-right .btn { padding: 6px 14px; font-size: 0.82rem; }
            .header-right .btn span { display: none; }
        }

        @media (max-width: 520px) {
            .hero-content h1 { font-size: 2rem; }
            .hero-content p { font-size: 0.95rem; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .hero-visual { min-height: 220px; }
            .hero-visual-inner { min-height: 220px; padding: 24px; }
            .hero-visual-inner h3 { font-size: 1.2rem; }
            .stat-item .num { font-size: 1.8rem; }
            .section-header h2 { font-size: 1.6rem; }
            .news-card .thumb { height: 160px; }
        }

        /* ===== 工具 ===== */
        .text-center { text-align: center; }
        .mt-8 { margin-top: 8px; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .gap-8 { gap: 8px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #4f46e5;
            --primary-dark: #3730a3;
            --primary-light: #818cf8;
            --primary-bg: #eef2ff;
            --secondary: #0ea5e9;
            --secondary-dark: #0284c7;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-soft: #334155;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 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(0,0,0,0.06), 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.04);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.10);
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;
            --space-4xl: 80px;
            --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
        button, input, select, textarea { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; color: var(--text); font-weight: 700; }
        h1 { font-size: 2.75rem; letter-spacing: -0.02em; }
        h2 { font-size: 2rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.375rem; }
        h4 { font-size: 1.125rem; }
        p { color: var(--text-soft); margin-bottom: var(--space-md); }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--space-lg);
        }
        section { padding: var(--space-4xl) 0; }
        .section-title {
            text-align: center;
            margin-bottom: var(--space-3xl);
        }
        .section-title h2 { margin-bottom: var(--space-md); }
        .section-title p {
            max-width: 640px;
            margin: 0 auto;
            color: var(--text-muted);
            font-size: 1.1rem;
        }
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            text-transform: uppercase;
            background: var(--primary-bg);
            color: var(--primary);
            margin-bottom: var(--space-md);
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 1px 4px rgba(0,0,0,0.02);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.02em;
        }
        .logo i { color: var(--primary); font-size: 1.5rem; }
        .logo span { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo:hover { opacity: 0.85; }
        .nav-list { display: flex; align-items: center; gap: var(--space-xs); }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-soft);
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a:hover { color: var(--primary); background: var(--primary-bg); }
        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 4px;
            background: var(--primary);
        }
        .nav-cta {
            background: var(--primary) !important;
            color: #fff !important;
            padding: 8px 22px !important;
            border-radius: 100px !important;
            font-weight: 600;
            box-shadow: 0 2px 8px rgba(79,70,229,0.25);
        }
        .nav-cta:hover { background: var(--primary-dark) !important; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(79,70,229,0.35) !important; }
        .menu-toggle { display: none; font-size: 1.5rem; color: var(--text); padding: var(--space-sm); cursor: pointer; }

        /* ===== Hero ===== */
        .hero {
            padding: var(--space-4xl) 0 var(--space-3xl);
            background: linear-gradient(135deg, var(--bg) 0%, var(--primary-bg) 100%);
            position: relative;
            overflow: hidden;
            min-height: 360px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(79,70,229,0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.06;
            pointer-events: none;
        }
        .hero .container { position: relative; z-index: 2; }
        .hero-content { max-width: 780px; }
        .hero-content .badge { background: rgba(79,70,229,0.12); color: var(--primary); }
        .hero-content h1 { margin-bottom: var(--space-lg); font-size: 3rem; }
        .hero-content h1 span { color: var(--primary); }
        .hero-content p { font-size: 1.2rem; color: var(--text-muted); max-width: 600px; margin-bottom: var(--space-xl); }
        .hero-actions { display: flex; gap: var(--space-md); flex-wrap: wrap; }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            padding: 12px 28px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 2px solid transparent;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 14px rgba(79,70,229,0.25);
        }
        .btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 28px rgba(79,70,229,0.35); }
        .btn-outline {
            background: transparent;
            color: var(--text);
            border-color: var(--border);
        }
        .btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-bg); transform: translateY(-2px); }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; }
        .btn-lg { padding: 16px 36px; font-size: 1.05rem; }

        /* ===== Guide Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-xl);
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: var(--space-xl) var(--space-lg);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            text-align: center;
            position: relative;
        }
        .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
        .step-number {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 1.4rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto var(--space-md);
            transition: all var(--transition);
        }
        .step-card:hover .step-number { background: var(--primary); color: #fff; }
        .step-card h3 { margin-bottom: var(--space-sm); font-size: 1.15rem; }
        .step-card p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0; }

        /* ===== Feature Cards ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-xl);
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: var(--space-xl) var(--space-lg);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .feature-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--primary-light); }
        .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: var(--space-md);
        }
        .feature-card h3 { margin-bottom: var(--space-sm); font-size: 1.1rem; }
        .feature-card p { font-size: 0.92rem; color: var(--text-muted); margin-bottom: 0; }

        /* ===== Content List ===== */
        .content-list { display: flex; flex-direction: column; gap: var(--space-md); }
        .content-item {
            display: flex;
            align-items: center;
            gap: var(--space-lg);
            padding: var(--space-lg);
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .content-item:hover { transform: translateX(4px); box-shadow: var(--shadow); border-color: var(--primary-light); }
        .content-item .thumb {
            width: 120px;
            height: 80px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            flex-shrink: 0;
            overflow: hidden;
        }
        .content-item .thumb img { width: 100%; height: 100%; object-fit: cover; }
        .content-item .info { flex: 1; }
        .content-item .info h4 { margin-bottom: 4px; font-size: 1.05rem; }
        .content-item .info p { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 0; }
        .content-item .meta { display: flex; gap: var(--space-md); font-size: 0.8rem; color: var(--text-light); margin-top: var(--space-sm); }
        .content-item .meta i { margin-right: 4px; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--space-md); }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow-sm); }
        .faq-question {
            padding: var(--space-lg);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            color: var(--text);
            gap: var(--space-md);
            user-select: none;
        }
        .faq-question i { color: var(--text-light); transition: transform var(--transition); font-size: 0.9rem; }
        .faq-item.active .faq-question i { transform: rotate(180deg); color: var(--primary); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
        }
        .faq-item.active .faq-answer { max-height: 300px; }
        .faq-answer-inner { padding: 0 var(--space-lg) var(--space-lg); color: var(--text-muted); font-size: 0.95rem; }
        .faq-answer-inner p { margin-bottom: 0; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: var(--space-4xl) 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -20%;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 70%);
        }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 { color: #fff; margin-bottom: var(--space-md); }
        .cta-section p { color: rgba(255,255,255,0.8); max-width: 600px; margin: 0 auto var(--space-xl); font-size: 1.1rem; }
        .cta-section .btn { background: #fff; color: var(--primary); border-color: #fff; }
        .cta-section .btn:hover { background: var(--primary-bg); border-color: var(--primary-bg); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,0,0,0.2); }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--text);
            color: rgba(255,255,255,0.7);
            padding: var(--space-4xl) 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: var(--space-2xl);
            padding-bottom: var(--space-2xl);
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo { color: #fff; font-size: 1.3rem; margin-bottom: var(--space-md); }
        .footer-brand .logo span { -webkit-text-fill-color: #fff; background: none; }
        .footer-brand .logo i { color: var(--primary-light); }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.5); max-width: 320px; }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: var(--space-md); font-weight: 600; }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.5);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: all var(--transition);
        }
        .footer-col a:hover { color: #fff; padding-left: 4px; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--space-lg) 0;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.35);
            flex-wrap: wrap;
            gap: var(--space-md);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .hero-content h1 { font-size: 2.4rem; }
        }

        @media (max-width: 768px) {
            .menu-toggle { display: block; }
            .nav-list {
                position: fixed;
                top: 68px;
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(16px);
                flex-direction: column;
                padding: var(--space-md);
                gap: var(--space-xs);
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                pointer-events: none;
            }
            .nav-list.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
            .nav-list a { width: 100%; padding: 12px 16px; border-radius: var(--radius-sm); }
            .nav-list a.active::after { display: none; }
            .nav-list a.active { background: var(--primary-bg); }
            .nav-cta { text-align: center; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .hero { padding: var(--space-3xl) 0 var(--space-2xl); min-height: auto; }
            .hero-content h1 { font-size: 2rem; }
            .hero-content p { font-size: 1rem; }
            section { padding: var(--space-3xl) 0; }
            .steps-grid { grid-template-columns: 1fr; }
            .features-grid { grid-template-columns: 1fr; }
            .content-item { flex-direction: column; align-items: flex-start; }
            .content-item .thumb { width: 100%; height: 180px; }
            .footer-grid { grid-template-columns: 1fr; gap: var(--space-xl); }
            .footer-bottom { flex-direction: column; text-align: center; }
            .section-title { margin-bottom: var(--space-2xl); }
        }

        @media (max-width: 520px) {
            .container { padding: 0 var(--space-md); }
            h1 { font-size: 1.7rem; }
            h2 { font-size: 1.35rem; }
            .hero-content h1 { font-size: 1.6rem; }
            .btn { padding: 10px 22px; font-size: 0.85rem; }
            .btn-lg { padding: 14px 28px; font-size: 0.95rem; }
            .step-card { padding: var(--space-lg) var(--space-md); }
            .feature-card { padding: var(--space-lg) var(--space-md); }
            .content-item { padding: var(--space-md); }
            .content-item .thumb { height: 140px; }
            .faq-question { padding: var(--space-md); font-size: 0.95rem; }
            .faq-answer-inner { padding: 0 var(--space-md) var(--space-md); }
            .footer-grid { gap: var(--space-lg); }
            .cta-section { padding: var(--space-3xl) 0; }
        }

        /* ===== Misc Utilities ===== */
        .text-center { text-align: center; }
        .mt-2 { margin-top: var(--space-2xl); }
        .mb-2 { margin-bottom: var(--space-2xl); }
        .gap-md { gap: var(--space-md); }
        .flex-center { display: flex; align-items: center; justify-content: center; }

        /* Tag chips */
        .tag-chips { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-top: var(--space-md); }
        .tag-chip {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.78rem;
            font-weight: 500;
            background: var(--bg-alt);
            color: var(--text-muted);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .tag-chip:hover { background: var(--primary-bg); color: var(--primary); border-color: var(--primary-light); }

        /* Divider */
        .divider { width: 60px; height: 4px; border-radius: 4px; background: linear-gradient(90deg, var(--primary), var(--secondary)); margin: var(--space-md) auto var(--space-lg); }
        .divider-left { margin: var(--space-md) 0 var(--space-lg); }

/* roulang page: article */
/* ===== 设计变量 ===== */
    :root {
        --primary: #2563eb;
        --primary-dark: #1d4ed8;
        --primary-light: #3b82f6;
        --primary-bg: #eff6ff;
        --accent: #f59e0b;
        --accent-dark: #d97706;
        --bg: #ffffff;
        --bg-alt: #f8fafc;
        --bg-dark: #0f172a;
        --text: #1e293b;
        --text-light: #64748b;
        --text-muted: #94a3b8;
        --border: #e2e8f0;
        --border-light: #f1f5f9;
        --radius: 16px;
        --radius-sm: 10px;
        --radius-xs: 6px;
        --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
        --shadow-md: 0 8px 40px rgba(0, 0, 0, 0.08);
        --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.10);
        --transition: 0.25s ease;
        --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        --max-width: 1200px;
        --nav-height: 72px;
    }

    /* ===== Reset & Base ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
    body {
        font-family: var(--font);
        font-size: 16px;
        line-height: 1.7;
        color: var(--text);
        background: var(--bg);
    }
    a { color: var(--primary); text-decoration: none; transition: var(--transition); }
    a:hover { color: var(--primary-dark); }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
    ul, ol { list-style: none; }
    .container {
        max-width: var(--max-width);
        margin: 0 auto;
        padding: 0 24px;
    }
    .container-narrow {
        max-width: 820px;
        margin: 0 auto;
        padding: 0 24px;
    }

    /* ===== 导航 ===== */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 100;
        background: rgba(255,255,255,0.92);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border);
        height: var(--nav-height);
        display: flex;
        align-items: center;
    }
    .site-header .container {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
    }
    .logo {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 1.25rem;
        font-weight: 700;
        color: var(--text);
        letter-spacing: -0.3px;
    }
    .logo i { color: var(--primary); font-size: 1.5rem; }
    .logo span { background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
    .logo:hover { opacity: 0.85; }
    .nav-list { display: flex; align-items: center; gap: 8px; }
    .nav-list a {
        padding: 8px 20px;
        border-radius: 40px;
        font-size: 0.95rem;
        font-weight: 500;
        color: var(--text-light);
        transition: var(--transition);
    }
    .nav-list a:hover { color: var(--primary); background: var(--primary-bg); }
    .nav-list a.active {
        color: #fff;
        background: var(--primary);
        box-shadow: 0 4px 14px rgba(37,99,235,0.30);
    }
    .nav-toggle {
        display: none;
        background: none;
        border: none;
        font-size: 1.5rem;
        color: var(--text);
        cursor: pointer;
        padding: 6px;
        border-radius: var(--radius-xs);
    }
    .nav-toggle:focus { outline: 2px solid var(--primary); outline-offset: 2px; }

    /* ===== 文章 Banner ===== */
    .article-banner {
        position: relative;
        padding: 80px 0 60px;
        background: var(--bg-alt);
        background-image: url('/assets/images/backpic/back-2.png');
        background-size: cover;
        background-position: center;
        background-blend-mode: overlay;
        background-color: rgba(15,23,42,0.70);
        color: #fff;
        margin-bottom: 0;
    }
    .article-banner .container-narrow {
        position: relative;
        z-index: 2;
    }
    .article-banner .breadcrumb {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 0.9rem;
        color: rgba(255,255,255,0.7);
        margin-bottom: 20px;
    }
    .article-banner .breadcrumb a { color: rgba(255,255,255,0.8); }
    .article-banner .breadcrumb a:hover { color: #fff; }
    .article-banner .breadcrumb i { font-size: 0.75rem; }
    .article-banner .category-tag {
        display: inline-block;
        background: var(--accent);
        color: #fff;
        padding: 4px 16px;
        border-radius: 40px;
        font-size: 0.85rem;
        font-weight: 600;
        margin-bottom: 16px;
    }
    .article-banner h1 {
        font-size: 2.4rem;
        font-weight: 800;
        line-height: 1.2;
        letter-spacing: -0.5px;
        max-width: 720px;
    }
    .article-banner .meta {
        display: flex;
        align-items: center;
        gap: 20px;
        margin-top: 20px;
        font-size: 0.95rem;
        color: rgba(255,255,255,0.75);
    }
    .article-banner .meta i { margin-right: 6px; }

    /* ===== 文章正文 ===== */
    .article-content-wrap {
        padding: 60px 0 80px;
        background: var(--bg);
    }
    .article-body {
        font-size: 1.05rem;
        line-height: 1.9;
        color: var(--text);
    }
    .article-body h2 { font-size: 1.6rem; font-weight: 700; margin: 36px 0 18px; color: var(--text); }
    .article-body h3 { font-size: 1.25rem; font-weight: 600; margin: 28px 0 14px; color: var(--text); }
    .article-body p { margin-bottom: 20px; }
    .article-body ul, .article-body ol { margin: 16px 0 20px 24px; list-style: disc; }
    .article-body li { margin-bottom: 8px; }
    .article-body img { border-radius: var(--radius); margin: 28px auto; box-shadow: var(--shadow-md); }
    .article-body blockquote {
        border-left: 4px solid var(--primary);
        background: var(--primary-bg);
        padding: 20px 24px;
        border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        margin: 24px 0;
        font-style: normal;
        color: var(--text-light);
    }
    .article-body a { color: var(--primary); font-weight: 500; border-bottom: 1px solid transparent; }
    .article-body a:hover { border-bottom-color: var(--primary); }
    .article-body hr { border: none; border-top: 2px solid var(--border); margin: 40px 0; }

    .article-not-found {
        text-align: center;
        padding: 80px 20px;
    }
    .article-not-found i { font-size: 3rem; color: var(--text-muted); margin-bottom: 20px; }
    .article-not-found h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 12px; }
    .article-not-found p { color: var(--text-light); margin-bottom: 24px; }
    .article-not-found .btn-back { display: inline-block; padding: 12px 32px; background: var(--primary); color: #fff; border-radius: 40px; font-weight: 600; }
    .article-not-found .btn-back:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.30); }

    /* ===== 相关文章 ===== */
    .related-section {
        padding: 60px 0 80px;
        background: var(--bg-alt);
    }
    .related-section .section-title {
        text-align: center;
        font-size: 1.8rem;
        font-weight: 700;
        margin-bottom: 40px;
        color: var(--text);
    }
    .related-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
    }
    .related-card {
        background: var(--bg);
        border-radius: var(--radius);
        overflow: hidden;
        box-shadow: var(--shadow);
        transition: var(--transition);
    }
    .related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
    .related-card .card-img {
        width: 100%;
        height: 200px;
        object-fit: cover;
        border-radius: 0;
    }
    .related-card .card-body { padding: 20px 24px 24px; }
    .related-card .card-body h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
    .related-card .card-body h3 a { color: var(--text); }
    .related-card .card-body h3 a:hover { color: var(--primary); }
    .related-card .card-body p { font-size: 0.95rem; color: var(--text-light); margin-bottom: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
    .related-card .card-body .meta { font-size: 0.85rem; color: var(--text-muted); display: flex; align-items: center; gap: 12px; }

    /* ===== CTA 区块 ===== */
    .article-cta {
        padding: 60px 0;
        background: var(--bg-dark);
        background-image: url('/assets/images/backpic/back-3.png');
        background-size: cover;
        background-position: center;
        background-blend-mode: overlay;
        background-color: rgba(15,23,42,0.78);
        color: #fff;
        text-align: center;
    }
    .article-cta h2 { font-size: 1.8rem; font-weight: 700; margin-bottom: 16px; }
    .article-cta p { font-size: 1.1rem; color: rgba(255,255,255,0.75); max-width: 600px; margin: 0 auto 28px; }
    .article-cta .btn-group { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
    .article-cta .btn-primary {
        display: inline-block;
        padding: 14px 36px;
        background: var(--accent);
        color: #fff;
        border-radius: 40px;
        font-weight: 600;
        font-size: 1rem;
        transition: var(--transition);
    }
    .article-cta .btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(245,158,11,0.35); }
    .article-cta .btn-outline {
        display: inline-block;
        padding: 14px 36px;
        border: 2px solid rgba(255,255,255,0.3);
        color: #fff;
        border-radius: 40px;
        font-weight: 600;
        font-size: 1rem;
        transition: var(--transition);
    }
    .article-cta .btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.08); transform: translateY(-2px); }

    /* ===== 页脚 ===== */
    .site-footer {
        background: var(--bg-dark);
        color: rgba(255,255,255,0.7);
        padding: 60px 0 0;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
        padding-bottom: 40px;
        border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .footer-brand .logo { color: #fff; font-size: 1.2rem; margin-bottom: 16px; }
    .footer-brand .logo i { color: var(--accent); }
    .footer-brand .logo span { -webkit-text-fill-color: #fff; background: none; }
    .footer-brand p { font-size: 0.95rem; line-height: 1.7; max-width: 340px; }
    .footer-col h4 { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: 18px; }
    .footer-col a { display: block; color: rgba(255,255,255,0.6); font-size: 0.95rem; padding: 4px 0; }
    .footer-col a:hover { color: #fff; }
    .footer-bottom {
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 12px;
        padding: 24px 0;
        font-size: 0.9rem;
        color: rgba(255,255,255,0.4);
    }
    .footer-bottom span:last-child { color: rgba(255,255,255,0.25); }

    /* ===== 响应式 ===== */
    @media (max-width: 1024px) {
        .footer-grid { grid-template-columns: 1fr 1fr; }
        .related-grid { grid-template-columns: repeat(2, 1fr); }
        .article-banner h1 { font-size: 2rem; }
    }
    @media (max-width: 768px) {
        .nav-list { display: none; flex-direction: column; background: var(--bg); position: absolute; top: var(--nav-height); left: 0; right: 0; padding: 16px 24px 24px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow); gap: 4px; }
        .nav-list.open { display: flex; }
        .nav-list a { width: 100%; padding: 12px 16px; border-radius: var(--radius-sm); }
        .nav-toggle { display: block; }
        .article-banner { padding: 60px 0 40px; }
        .article-banner h1 { font-size: 1.6rem; }
        .article-banner .meta { flex-wrap: wrap; gap: 12px; font-size: 0.85rem; }
        .article-content-wrap { padding: 40px 0 60px; }
        .article-body { font-size: 1rem; }
        .related-grid { grid-template-columns: 1fr; }
        .footer-grid { grid-template-columns: 1fr; gap: 24px; }
        .footer-bottom { flex-direction: column; text-align: center; }
        .article-cta h2 { font-size: 1.4rem; }
        .article-cta .btn-group { flex-direction: column; align-items: center; }
    }
    @media (max-width: 520px) {
        .container { padding: 0 16px; }
        .article-banner h1 { font-size: 1.35rem; }
        .article-body h2 { font-size: 1.25rem; }
        .article-body h3 { font-size: 1.1rem; }
        .related-card .card-img { height: 160px; }
    }