/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8a;
            --primary-dark: #0f2440;
            --secondary: #e8a838;
            --secondary-light: #f0c060;
            --secondary-dark: #c88a20;
            --accent: #3a8fb5;
            --bg-light: #f8fafc;
            --bg-mid: #eef2f6;
            --bg-dark: #0f1a2e;
            --text-primary: #1a1a2e;
            --text-body: #3a3a4e;
            --text-muted: #7a7a8e;
            --text-light: #f0f2f6;
            --border: #dce2ea;
            --border-light: #e8edf4;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-md: 0 6px 24px rgba(0,0,0,0.07);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.10);
            --shadow-xl: 0 24px 64px rgba(0,0,0,0.14);
            --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-sans: '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-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-light);
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-light); }
        button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { color: var(--text-primary); font-weight: 700; line-height: 1.3; }
        h1 { font-size: clamp(2rem, 4.5vw, 3.4rem); }
        h2 { font-size: clamp(1.6rem, 3.2vw, 2.4rem); }
        h3 { font-size: clamp(1.2rem, 2vw, 1.6rem); }
        h4 { font-size: clamp(1rem, 1.6vw, 1.2rem); }
        p { margin-bottom: 1em; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container { padding: 0 16px; }
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0; left: 0; right: 0;
            height: var(--nav-height);
            z-index: 1000;
            background: rgba(255,255,255,0.75);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid rgba(255,255,255,0.25);
            box-shadow: 0 1px 12px rgba(0,0,0,0.04);
            transition: var(--transition);
        }
        .site-header.scrolled {
            background: rgba(255,255,255,0.92);
            box-shadow: 0 4px 24px rgba(0,0,0,0.06);
            border-bottom: 1px solid var(--border-light);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .site-logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary-dark);
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .site-logo i { color: var(--secondary); font-size: 1.3em; }
        .site-logo span { background: linear-gradient(135deg, var(--primary-dark), var(--primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-body);
            transition: var(--transition);
            position: relative;
        }
        .nav-list a:hover { color: var(--primary); background: rgba(26,58,92,0.06); }
        .nav-list a.active {
            color: var(--primary);
            background: rgba(26,58,92,0.08);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px; left: 50%;
            transform: translateX(-50%);
            width: 20px; height: 3px;
            background: var(--secondary);
            border-radius: 4px;
        }
        .nav-cta {
            background: var(--primary) !important;
            color: #fff !important;
            padding: 8px 22px !important;
            border-radius: 40px !important;
            font-weight: 600 !important;
            box-shadow: 0 4px 12px rgba(26,58,92,0.20);
        }
        .nav-cta:hover { background: var(--primary-light) !important; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(26,58,92,0.25); }
        .nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; background: none; border: none; }
        .nav-toggle span { display: block; width: 26px; height: 2.5px; background: var(--text-primary); border-radius: 4px; transition: var(--transition); }
        @media (max-width: 768px) {
            .nav-toggle { display: flex; }
            .nav-list {
                position: fixed;
                top: var(--nav-height); left: 0; right: 0;
                flex-direction: column;
                background: rgba(255,255,255,0.96);
                backdrop-filter: blur(20px);
                padding: 20px 24px;
                gap: 4px;
                box-shadow: 0 16px 40px rgba(0,0,0,0.10);
                border-bottom: 1px solid var(--border);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
            }
            .nav-list.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
            .nav-list a { padding: 12px 16px; width: 100%; font-size: 1rem; }
            .nav-list a.active::after { display: none; }
            .nav-cta { margin-top: 8px; text-align: center; }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 92vh;
            display: flex;
            align-items: center;
            padding-top: var(--nav-height);
            background: linear-gradient(145deg, #0f1a2e 0%, #1a3a5c 60%, #2a5a8a 100%);
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.18;
            mix-blend-mode: overlay;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: 0; left: 0; right: 0;
            height: 160px;
            background: linear-gradient(to top, var(--bg-light), transparent);
        }
        .hero .container { position: relative; z-index: 2; }
        .hero-content { max-width: 780px; }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(232,168,56,0.18);
            border: 1px solid rgba(232,168,56,0.25);
            color: var(--secondary-light);
            padding: 6px 18px;
            border-radius: 40px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i { font-size: 0.75em; }
        .hero h1 {
            color: #fff;
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 20px;
            text-shadow: 0 2px 20px rgba(0,0,0,0.15);
        }
        .hero h1 span { color: var(--secondary); }
        .hero p {
            font-size: clamp(1rem, 1.6vw, 1.2rem);
            color: rgba(255,255,255,0.75);
            max-width: 620px;
            margin-bottom: 32px;
            line-height: 1.8;
        }
        .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            border: none;
            text-align: center;
        }
        .btn-primary {
            background: var(--secondary);
            color: var(--primary-dark);
            box-shadow: 0 8px 28px rgba(232,168,56,0.30);
        }
        .btn-primary:hover { background: var(--secondary-light); transform: translateY(-2px); box-shadow: 0 12px 36px rgba(232,168,56,0.35); color: var(--primary-dark); }
        .btn-outline {
            background: transparent;
            color: #fff;
            border: 1.5px solid rgba(255,255,255,0.30);
            backdrop-filter: blur(4px);
        }
        .btn-outline:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.50); color: #fff; }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.10);
        }
        .hero-stats .stat-item { }
        .hero-stats .stat-num { font-size: 2rem; font-weight: 800; color: #fff; line-height: 1.2; }
        .hero-stats .stat-num small { font-size: 1rem; font-weight: 400; color: rgba(255,255,255,0.50); margin-left: 4px; }
        .hero-stats .stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.55); margin-top: 2px; }
        @media (max-width: 768px) {
            .hero { min-height: 80vh; }
            .hero-stats { gap: 24px; flex-wrap: wrap; }
            .hero-stats .stat-num { font-size: 1.6rem; }
            .hero-actions { flex-direction: column; align-items: flex-start; }
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt { background: var(--bg-mid); }
        .section-dark {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.75);
        }
        .section-dark h2, .section-dark h3 { color: #fff; }
        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 48px;
        }
        .section-header h2 { margin-bottom: 12px; }
        .section-header p { color: var(--text-muted); font-size: 1.05rem; }
        .section-dark .section-header p { color: rgba(255,255,255,0.55); }
        .section-tag {
            display: inline-block;
            background: rgba(232,168,56,0.12);
            color: var(--secondary-dark);
            padding: 4px 16px;
            border-radius: 40px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            margin-bottom: 12px;
        }
        .section-dark .section-tag { background: rgba(232,168,56,0.15); color: var(--secondary-light); }

        /* ===== 分类卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .card {
            background: #fff;
            border-radius: var(--radius-md);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); border-color: rgba(26,58,92,0.10); }
        .card-icon {
            width: 52px; height: 52px;
            border-radius: var(--radius-sm);
            display: flex; align-items: center; justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 16px;
            background: rgba(26,58,92,0.06);
            color: var(--primary);
        }
        .card h3 { font-size: 1.15rem; margin-bottom: 8px; }
        .card p { font-size: 0.92rem; color: var(--text-muted); margin-bottom: 0; line-height: 1.6; }
        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 14px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--primary);
        }
        .card-link i { font-size: 0.75em; transition: var(--transition); }
        .card-link:hover i { transform: translateX(4px); }

        .card-cover {
            border-radius: var(--radius-md);
            overflow: hidden;
            background: #fff;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .card-cover:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        .card-cover .cover-img {
            width: 100%; height: 180px;
            object-fit: cover;
            display: block;
        }
        .card-cover .cover-body { padding: 20px 22px 24px; }
        .card-cover .cover-body h3 { font-size: 1.1rem; margin-bottom: 6px; }
        .card-cover .cover-body p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0; }

        /* ===== 内容列表卡片 ===== */
        .content-list { display: flex; flex-direction: column; gap: 16px; }
        .content-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            background: #fff;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .content-item:hover { box-shadow: var(--shadow-md); border-color: rgba(26,58,92,0.08); }
        .content-item .item-thumb {
            flex-shrink: 0;
            width: 100px; height: 72px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            background: var(--bg-mid);
        }
        .content-item .item-body { flex: 1; min-width: 0; }
        .content-item .item-body h4 { font-size: 1rem; margin-bottom: 4px; }
        .content-item .item-body h4 a { color: var(--text-primary); }
        .content-item .item-body h4 a:hover { color: var(--primary); }
        .content-item .item-body p { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .content-item .item-meta {
            display: flex;
            gap: 16px;
            margin-top: 6px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .content-item .item-meta span { display: flex; align-items: center; gap: 4px; }
        .content-item .item-meta .tag {
            display: inline-block;
            background: rgba(26,58,92,0.06);
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            color: var(--primary);
        }
        @media (max-width: 640px) {
            .content-item { flex-direction: column; gap: 12px; }
            .content-item .item-thumb { width: 100%; height: 140px; }
        }

        /* ===== 数据/流程 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 24px;
        }
        .stat-card {
            text-align: center;
            padding: 32px 16px;
            background: rgba(255,255,255,0.04);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255,255,255,0.06);
        }
        .stat-card .num { font-size: 2.4rem; font-weight: 800; color: var(--secondary); line-height: 1.2; }
        .stat-card .label { font-size: 0.9rem; color: rgba(255,255,255,0.6); margin-top: 6px; }

        .flow-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 32px;
            position: relative;
        }
        .flow-step {
            text-align: center;
            position: relative;
        }
        .flow-step .step-num {
            width: 48px; height: 48px;
            border-radius: 50%;
            background: var(--secondary);
            color: var(--primary-dark);
            font-weight: 800;
            font-size: 1.2rem;
            display: flex; align-items: center; justify-content: center;
            margin: 0 auto 14px;
        }
        .flow-step h4 { margin-bottom: 6px; }
        .flow-step p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0; }
        .flow-arrow { display: none; }
        @media (min-width: 900px) {
            .flow-grid { grid-template-columns: repeat(4, 1fr); }
        }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: #fff;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: rgba(26,58,92,0.12); }
        .faq-item .faq-q {
            padding: 18px 24px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            background: none;
            width: 100%;
            text-align: left;
            font-size: 1rem;
        }
        .faq-item .faq-q i { color: var(--primary); transition: var(--transition); font-size: 0.85em; }
        .faq-item.active .faq-q i { transform: rotate(180deg); }
        .faq-item .faq-a {
            padding: 0 24px 18px;
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.7;
            display: none;
        }
        .faq-item.active .faq-a { display: block; }
        .section-dark .faq-item { background: rgba(255,255,255,0.04); border-color: rgba(255,255,255,0.06); }
        .section-dark .faq-item .faq-q { color: #fff; }
        .section-dark .faq-item .faq-a { color: rgba(255,255,255,0.6); }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            padding: 72px 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 center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 { color: #fff; margin-bottom: 14px; }
        .cta-section p { color: rgba(255,255,255,0.7); max-width: 560px; margin: 0 auto 28px; font-size: 1.05rem; }
        .cta-section .btn-primary { font-size: 1.05rem; padding: 16px 40px; }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.55);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand .site-logo { color: #fff; margin-bottom: 12px; }
        .footer-brand .site-logo span { background: linear-gradient(135deg, #fff, #c8d8e8); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .footer-brand p { font-size: 0.9rem; max-width: 320px; line-height: 1.7; }
        .footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 14px; }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.5);
            font-size: 0.88rem;
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer-col a:hover { color: var(--secondary); padding-left: 4px; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
        }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== 辅助 ===== */
        .text-center { text-align: center; }
        .mt-12 { margin-top: 12px; }
        .mt-24 { margin-top: 24px; }
        .mt-36 { margin-top: 36px; }
        .gap-16 { gap: 16px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }

        /* ===== 响应式微调 ===== */
        @media (max-width: 768px) {
            .section { padding: 56px 0; }
            .section-header { margin-bottom: 32px; }
            .card-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .flow-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
        }
        @media (max-width: 520px) {
            .stats-grid { grid-template-columns: 1fr 1fr; }
            .flow-grid { grid-template-columns: 1fr; }
            .hero-stats { flex-direction: column; gap: 16px; }
        }

        /* ===== 滚动动画 ===== */
        .fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
        .fade-in.visible { opacity: 1; transform: translateY(0); }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --secondary: #0ea5e9;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --success: #10b981;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-alt: #f1f5f9;
            --bg-dark: #0f172a;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-inverse: #f8fafc;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 32px rgba(0,0,0,0.10);
            --shadow-xl: 0 24px 48px rgba(0,0,0,0.12);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== 基础 Reset ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
        }
        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: 2px; }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        input, textarea { font-family: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container { padding: 0 16px; }
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255,255,255,0.72);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid rgba(226,232,240,0.6);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            background: rgba(255,255,255,0.92);
            box-shadow: 0 1px 8px rgba(0,0,0,0.06);
        }
        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--text-primary);
            flex-shrink: 0;
        }
        .site-logo i { color: var(--primary); font-size: 26px; }
        .site-logo span { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .site-logo:hover { opacity: 0.85; }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            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: 2px;
            background: var(--primary);
        }
        .nav-list a.nav-cta {
            background: var(--primary);
            color: #fff;
            padding: 8px 22px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 6px;
            box-shadow: 0 2px 8px rgba(37,99,235,0.25);
        }
        .nav-list a.nav-cta:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(37,99,235,0.35); color: #fff; }
        .nav-list a.nav-cta i { font-size: 13px; }

        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: var(--bg-alt);
            gap: 5px;
            padding: 8px;
        }
        .nav-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .nav-toggle.active span:nth-child(2) { opacity: 0; }
        .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        @media (max-width: 768px) {
            .nav-toggle { display: flex; }
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 20px 24px;
                gap: 6px;
                box-shadow: 0 12px 32px rgba(0,0,0,0.10);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
                border-bottom: 1px solid var(--border);
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 16px;
                font-size: 16px;
                border-radius: var(--radius-sm);
            }
            .nav-list a.active::after { display: none; }
            .nav-list a.nav-cta {
                justify-content: center;
                margin-top: 8px;
                padding: 12px 20px;
            }
        }

        /* ===== 页面横幅 ===== */
        .page-banner {
            margin-top: var(--header-height);
            padding: 60px 0 50px;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            position: relative;
            overflow: hidden;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .page-banner .container { position: relative; z-index: 2; }
        .page-banner h1 {
            color: var(--text-inverse);
            font-size: 32px;
            font-weight: 800;
            max-width: 800px;
            line-height: 1.35;
        }
        .page-banner .banner-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 28px;
            margin-top: 16px;
            color: rgba(255,255,255,0.7);
            font-size: 14px;
        }
        .page-banner .banner-meta i { margin-right: 6px; color: var(--accent); }
        .page-banner .banner-meta .category-badge {
            display: inline-block;
            background: rgba(37,99,235,0.25);
            color: #93c5fd;
            padding: 2px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            border: 1px solid rgba(37,99,235,0.3);
        }
        @media (max-width: 768px) {
            .page-banner { padding: 40px 0 36px; }
            .page-banner h1 { font-size: 24px; }
            .page-banner .banner-meta { gap: 10px 20px; font-size: 13px; }
        }

        /* ===== 文章主体 ===== */
        .article-section {
            padding: 50px 0 70px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        @media (max-width: 992px) {
            .article-layout { grid-template-columns: 1fr; }
        }

        .article-main {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            padding: 40px;
        }
        @media (max-width: 768px) {
            .article-main { padding: 24px 20px; }
        }

        .article-content {
            font-size: 16.5px;
            line-height: 1.85;
            color: var(--text-primary);
        }
        .article-content h2 { font-size: 24px; margin-top: 36px; margin-bottom: 14px; }
        .article-content h3 { font-size: 20px; margin-top: 28px; margin-bottom: 10px; }
        .article-content p { margin-bottom: 18px; }
        .article-content ul, .article-content ol { margin-bottom: 18px; padding-left: 24px; }
        .article-content li { margin-bottom: 8px; list-style: disc; }
        .article-content ol li { list-style: decimal; }
        .article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
        .article-content a:hover { color: var(--primary-dark); }
        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-bg);
            padding: 16px 22px;
            margin: 20px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-content img {
            border-radius: var(--radius-md);
            margin: 24px 0;
            box-shadow: var(--shadow-md);
            width: 100%;
            object-fit: cover;
        }
        .article-content code {
            background: var(--bg-alt);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            font-family: 'SF Mono', 'Fira Code', monospace;
        }
        .article-content pre {
            background: #1e293b;
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            font-size: 14px;
            line-height: 1.6;
            margin: 20px 0;
        }
        .article-content pre code { background: none; padding: 0; color: inherit; }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 15px;
        }
        .article-content th, .article-content td {
            padding: 10px 16px;
            border: 1px solid var(--border);
            text-align: left;
        }
        .article-content th { background: var(--bg-alt); font-weight: 600; }
        .article-content hr {
            border: none;
            height: 1px;
            background: var(--border);
            margin: 32px 0;
        }

        /* ===== 侧栏 ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .sidebar-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            padding: 24px 20px;
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card h3 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 14px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-bg);
            color: var(--text-primary);
        }
        .sidebar-card h3 i { color: var(--primary); margin-right: 8px; }
        .sidebar-list a {
            display: flex;
            padding: 10px 0;
            border-bottom: 1px solid var(--border-light);
            font-size: 14px;
            color: var(--text-secondary);
            transition: all var(--transition);
            gap: 10px;
            align-items: flex-start;
        }
        .sidebar-list a:last-child { border-bottom: none; }
        .sidebar-list a:hover { color: var(--primary); padding-left: 6px; }
        .sidebar-list a .list-index {
            flex-shrink: 0;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            font-weight: 600;
        }
        .sidebar-list a:hover .list-index { background: var(--primary); color: #fff; }
        .sidebar-list a .list-text { flex: 1; line-height: 1.4; }

        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            padding: 24px 20px;
            border-radius: var(--radius-md);
            text-align: center;
        }
        .sidebar-cta h3 { color: #fff; border-bottom-color: rgba(255,255,255,0.2); }
        .sidebar-cta p { font-size: 14px; opacity: 0.9; margin-bottom: 16px; }
        .sidebar-cta .btn-white {
            display: inline-block;
            background: #fff;
            color: var(--primary);
            padding: 10px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 14px;
            transition: all var(--transition);
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
        .sidebar-cta .btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.20); color: var(--primary-dark); }

        /* ===== 文章导航（上下篇） ===== */
        .article-nav {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 40px;
            padding-top: 30px;
            border-top: 1px solid var(--border);
        }
        .article-nav a {
            display: flex;
            flex-direction: column;
            padding: 18px 22px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            background: var(--bg-body);
            transition: all var(--transition);
        }
        .article-nav a:hover { border-color: var(--primary); background: var(--primary-bg); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
        .article-nav .nav-label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
        .article-nav .nav-title { font-size: 15px; font-weight: 600; color: var(--text-primary); line-height: 1.4; }
        .article-nav a.next { text-align: right; }
        @media (max-width: 640px) {
            .article-nav { grid-template-columns: 1fr; }
            .article-nav a.next { text-align: left; }
        }

        /* ===== 内容未找到 ===== */
        .not-found-box {
            text-align: center;
            padding: 60px 24px;
        }
        .not-found-box i { font-size: 64px; color: var(--text-muted); margin-bottom: 20px; }
        .not-found-box h2 { font-size: 28px; margin-bottom: 12px; }
        .not-found-box p { color: var(--text-secondary); margin-bottom: 24px; }
        .not-found-box .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            padding: 12px 32px;
            border-radius: var(--radius-md);
            font-weight: 600;
            transition: all var(--transition);
        }
        .not-found-box .btn-back:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); color: #fff; }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.8);
            padding: 60px 0 30px;
            margin-top: 0;
        }
        .site-footer .container { max-width: var(--max-width); }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 40px 32px;
            padding-bottom: 36px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .site-logo { color: #fff; margin-bottom: 14px; font-size: 20px; }
        .footer-brand .site-logo i { color: var(--secondary); }
        .footer-brand .site-logo span { -webkit-text-fill-color: #fff; background: none; }
        .footer-brand p { font-size: 14px; line-height: 1.7; color: rgba(255,255,255,0.6); max-width: 360px; }
        .footer-col h4 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 16px; letter-spacing: 0.3px; }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.6);
            font-size: 14px;
            padding: 4px 0;
            transition: all var(--transition);
        }
        .footer-col a:hover { color: #fff; padding-left: 4px; }
        .footer-col a i { width: 20px; margin-right: 6px; color: var(--secondary); }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            padding-top: 24px;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom span { display: inline-block; }
        @media (max-width: 900px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px 24px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 540px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; align-items: center; text-align: center; }
        }

        /* ===== 通用辅助 ===== */
        .text-center { text-align: center; }
        .mt-8 { margin-top: 8px; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mb-16 { margin-bottom: 16px; }
        .mb-24 { margin-bottom: 24px; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --color-primary: #2563eb;
            --color-primary-dark: #1d4ed8;
            --color-primary-light: #60a5fa;
            --color-primary-bg: #eff6ff;
            --color-accent: #f59e0b;
            --color-accent-dark: #d97706;
            --color-accent-bg: #fef9ec;
            --color-bg: #ffffff;
            --color-bg-alt: #f8fafc;
            --color-bg-band: #f1f5f9;
            --color-text: #0f172a;
            --color-text-secondary: #475569;
            --color-text-muted: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-glass: rgba(255, 255, 255, 0.72);
            --color-glass-border: rgba(255, 255, 255, 0.25);
            --color-footer-bg: #0f172a;
            --color-footer-text: #cbd5e1;
            --color-footer-heading: #f1f5f9;
            --color-danger: #ef4444;
            --color-success: #10b981;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10), 0 4px 16px rgba(0, 0, 0, 0.06);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.12);
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--color-primary-dark); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        input, textarea { font-family: inherit; font-size: 1rem; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--color-text); }
        h1 { font-size: 2.75rem; letter-spacing: -0.02em; }
        h2 { font-size: 2.125rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.125rem; }
        p { margin-bottom: 1rem; color: var(--color-text-secondary); }
        p:last-child { margin-bottom: 0; }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        section { padding: 80px 0; }
        .section-label {
            display: inline-block;
            font-size: 0.8125rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--color-primary);
            background: var(--color-primary-bg);
            padding: 4px 16px;
            border-radius: 100px;
            margin-bottom: 12px;
        }
        .section-title {
            text-align: center;
            margin-bottom: 16px;
        }
        .section-desc {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 48px auto;
            font-size: 1.1rem;
            color: var(--color-text-secondary);
        }
        .text-center { text-align: center; }
        .text-muted { color: var(--color-text-muted); }

        /* ===== 玻璃导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: var(--color-glass);
            backdrop-filter: blur(18px) saturate(1.4);
            -webkit-backdrop-filter: blur(18px) saturate(1.4);
            border-bottom: 1px solid var(--color-glass-border);
            box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            background: rgba(255, 255, 255, 0.92);
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
        }
        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--color-text);
            letter-spacing: -0.02em;
            text-decoration: none;
            flex-shrink: 0;
        }
        .site-logo i { color: var(--color-primary); font-size: 1.5rem; }
        .site-logo span { background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .site-logo:hover { opacity: 0.9; color: var(--color-text); }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a {
            padding: 8px 18px;
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--color-text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            text-decoration: none;
            position: relative;
        }
        .nav-list a:hover { color: var(--color-primary); background: var(--color-primary-bg); }
        .nav-list a.active {
            color: var(--color-primary);
            background: var(--color-primary-bg);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-primary);
            border-radius: 4px;
        }
        .nav-list a.nav-cta {
            background: var(--color-primary);
            color: #fff;
            padding: 10px 24px;
            border-radius: 100px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.30);
        }
        .nav-list a.nav-cta:hover {
            background: var(--color-primary-dark);
            color: #fff;
            box-shadow: 0 6px 24px rgba(37, 99, 235, 0.40);
            transform: translateY(-1px);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--color-text);
            border-radius: 4px;
            transition: all var(--transition);
        }
        .nav-toggle:hover { background: var(--color-bg-alt); }

        /* ===== Banner ===== */
        .page-banner {
            padding: 140px 0 80px 0;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
            position: relative;
            overflow: hidden;
            min-height: 380px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            mix-blend-mode: overlay;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(37, 99, 235, 0.20) 0%, transparent 70%);
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .page-banner h1 {
            color: #fff;
            font-size: 3rem;
            margin-bottom: 16px;
            max-width: 720px;
        }
        .page-banner p {
            color: rgba(255, 255, 255, 0.80);
            font-size: 1.15rem;
            max-width: 600px;
            margin-bottom: 0;
        }
        .banner-badge {
            display: inline-block;
            background: rgba(37, 99, 235, 0.25);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: var(--color-primary-light);
            font-size: 0.8125rem;
            font-weight: 600;
            padding: 4px 18px;
            border-radius: 100px;
            margin-bottom: 16px;
            letter-spacing: 0.04em;
        }

        /* ===== 分类概述 ===== */
        .overview-section {
            background: var(--color-bg);
        }
        .overview-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .overview-content h2 { margin-bottom: 16px; }
        .overview-content p { font-size: 1.05rem; }
        .overview-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-top: 24px;
        }
        .stat-item {
            background: var(--color-bg-alt);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            border: 1px solid var(--color-border);
            text-align: center;
        }
        .stat-item .num {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--color-primary);
            line-height: 1.2;
        }
        .stat-item .label {
            font-size: 0.875rem;
            color: var(--color-text-secondary);
            margin-top: 4px;
        }
        .overview-image img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            width: 100%;
            height: auto;
            object-fit: cover;
        }

        /* ===== 指南卡片 ===== */
        .guide-section {
            background: var(--color-bg-alt);
        }
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .guide-card {
            background: var(--color-bg);
            border-radius: var(--radius-md);
            padding: 32px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .guide-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-primary-light);
        }
        .guide-card .icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: var(--color-primary-bg);
            color: var(--color-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 18px;
        }
        .guide-card h3 { font-size: 1.25rem; margin-bottom: 10px; }
        .guide-card p { font-size: 0.95rem; color: var(--color-text-secondary); flex: 1; }
        .guide-card .tag {
            display: inline-block;
            margin-top: 16px;
            font-size: 0.8125rem;
            color: var(--color-primary);
            background: var(--color-primary-bg);
            padding: 2px 14px;
            border-radius: 100px;
            font-weight: 500;
            align-self: flex-start;
        }
        .guide-card .card-footer-link {
            margin-top: 16px;
            font-weight: 600;
            color: var(--color-primary);
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.9375rem;
        }
        .guide-card .card-footer-link i { transition: transform var(--transition); }
        .guide-card:hover .card-footer-link i { transform: translateX(4px); }

        /* ===== 步骤流程 ===== */
        .steps-section {
            background: var(--color-bg);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 44px;
            left: 12%;
            right: 12%;
            height: 3px;
            background: linear-gradient(90deg, var(--color-primary-light), var(--color-primary));
            border-radius: 4px;
            z-index: 0;
        }
        .step-item {
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--color-bg);
            padding: 0 8px;
        }
        .step-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.35rem;
            font-weight: 800;
            margin: 0 auto 18px auto;
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.30);
        }
        .step-item h4 { font-size: 1.1rem; margin-bottom: 8px; }
        .step-item p { font-size: 0.9rem; color: var(--color-text-secondary); margin-bottom: 0; }

        /* ===== 使用技巧 ===== */
        .tips-section {
            background: var(--color-bg-band);
        }
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .tip-card {
            background: var(--color-bg);
            border-radius: var(--radius-md);
            padding: 28px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .tip-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--color-accent);
        }
        .tip-card .tip-icon {
            font-size: 1.75rem;
            color: var(--color-accent);
            margin-bottom: 14px;
        }
        .tip-card h4 { font-size: 1.1rem; margin-bottom: 8px; }
        .tip-card p { font-size: 0.925rem; color: var(--color-text-secondary); margin-bottom: 0; }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--color-bg);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--color-primary-light); }
        .faq-question {
            padding: 20px 28px;
            font-weight: 600;
            font-size: 1.025rem;
            color: var(--color-text);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            background: var(--color-bg);
            transition: background var(--transition);
            user-select: none;
        }
        .faq-question:hover { background: var(--color-bg-alt); }
        .faq-question i { color: var(--color-primary); transition: transform var(--transition); font-size: 0.9rem; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 28px 20px 28px;
            font-size: 0.95rem;
            color: var(--color-text-secondary);
            display: none;
            line-height: 1.8;
        }
        .faq-item.open .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
            padding: 72px 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 center / cover no-repeat;
            opacity: 0.08;
        }
        .cta-section .container { position: relative; z-index: 1; }
        .cta-section h2 { color: #fff; font-size: 2.25rem; margin-bottom: 12px; }
        .cta-section p { color: rgba(255, 255, 255, 0.85); font-size: 1.1rem; max-width: 600px; margin: 0 auto 28px auto; }
        .cta-button {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: #fff;
            color: var(--color-primary);
            font-weight: 700;
            font-size: 1.05rem;
            padding: 16px 40px;
            border-radius: 100px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.20);
            transition: all var(--transition);
        }
        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 48px rgba(0, 0, 0, 0.30);
            color: var(--color-primary-dark);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--color-footer-bg);
            color: var(--color-footer-text);
            padding: 60px 0 32px 0;
        }
        .site-footer .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .site-logo { color: #fff; margin-bottom: 16px; }
        .footer-brand .site-logo i { color: var(--color-primary-light); }
        .footer-brand .site-logo span { -webkit-text-fill-color: #fff; background: none; }
        .footer-brand p { font-size: 0.9rem; color: var(--color-footer-text); line-height: 1.8; max-width: 320px; }
        .footer-col h4 { color: var(--color-footer-heading); font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
        .footer-col a {
            display: block;
            color: var(--color-footer-text);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: color var(--transition);
            text-decoration: none;
        }
        .footer-col a:hover { color: var(--color-primary-light); }
        .footer-col a i { width: 22px; color: var(--color-primary-light); }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--color-text-muted);
        }
        .footer-bottom span:first-child { color: var(--color-footer-text); }

        /* ===== 移动端响应 ===== */
        @media (max-width: 1024px) {
            .overview-grid { gap: 32px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .steps-grid::before { display: none; }
            .steps-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
        }

        @media (max-width: 768px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.625rem; }
            section { padding: 56px 0; }
            .page-banner { padding: 120px 0 56px 0; min-height: 300px; }
            .page-banner h1 { font-size: 2.125rem; }
            .page-banner p { font-size: 1rem; }

            .nav-toggle { display: flex; }
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(18px);
                -webkit-backdrop-filter: blur(18px);
                flex-direction: column;
                padding: 20px 24px;
                gap: 6px;
                box-shadow: 0 24px 48px rgba(0, 0, 0, 0.12);
                border-bottom: 1px solid var(--color-border);
                transform: translateY(-110%);
                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 { padding: 14px 18px; width: 100%; font-size: 1rem; border-radius: var(--radius-sm); }
            .nav-list a.active::after { display: none; }
            .nav-list a.nav-cta { justify-content: center; margin-top: 8px; }

            .overview-grid { grid-template-columns: 1fr; }
            .overview-image { order: -1; }
            .overview-stats { grid-template-columns: 1fr 1fr; }
            .guide-grid { grid-template-columns: 1fr; }
            .tips-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
            .step-item { padding: 0; }

            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section h2 { font-size: 1.75rem; }
            .cta-button { padding: 14px 32px; font-size: 1rem; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .page-banner h1 { font-size: 1.625rem; }
            .overview-stats { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr; }
            .guide-card { padding: 24px; }
            .faq-question { padding: 16px 20px; font-size: 0.95rem; }
            .faq-answer { padding: 0 20px 16px 20px; }
            .stat-item .num { font-size: 1.5rem; }
        }

        /* ===== 工具类 ===== */
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
        .fade-in { animation: fadeIn 0.6s ease-out both; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* roulang page: category2 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f172a;
            --primary-light: #1e293b;
            --primary-lighter: #334155;
            --accent: #6366f1;
            --accent-hover: #4f46e5;
            --accent-light: #818cf8;
            --accent-bg: rgba(99, 102, 241, 0.08);
            --bg: #f8fafc;
            --bg-alt: #f1f5f9;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.03);
            --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, 0.05);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.10);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --container: 1200px;
            --nav-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            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: 1.3;
            font-weight: 700;
            color: var(--text);
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 1em;
        }
        p:last-child {
            margin-bottom: 0;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow {
            max-width: 880px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 网格工具 ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: 24px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-between {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .gap-12 {
            gap: 12px;
        }
        .gap-16 {
            gap: 16px;
        }
        .gap-24 {
            gap: 24px;
        }
        .gap-32 {
            gap: 32px;
        }
        .text-center {
            text-align: center;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .section-sub {
            font-size: 1.08rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto 48px auto;
            line-height: 1.7;
        }
        .section-padding {
            padding: 80px 0;
        }
        .section-padding-sm {
            padding: 56px 0;
        }

        /* ===== 导航 - 玻璃沉浸 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(15, 23, 42, 0.55);
            backdrop-filter: blur(18px) saturate(1.4);
            -webkit-backdrop-filter: blur(18px) saturate(1.4);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            background: rgba(15, 23, 42, 0.88);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
            border-bottom-color: rgba(255, 255, 255, 0.06);
        }
        .header-inner {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.02em;
            text-decoration: none;
            flex-shrink: 0;
        }
        .site-logo i {
            font-size: 1.4rem;
            color: var(--accent-light);
        }
        .site-logo span {
            background: linear-gradient(135deg, #fff 60%, var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .site-logo:hover {
            opacity: 0.9;
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-xs);
            font-size: 0.92rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.75);
            text-decoration: none;
            transition: all var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .nav-list a:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.08);
        }
        .nav-list a.active {
            color: #fff;
            background: rgba(99, 102, 241, 0.2);
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 2px;
            background: var(--accent-light);
        }
        .nav-list a.nav-cta {
            background: var(--accent);
            color: #fff;
            padding: 8px 22px;
            border-radius: var(--radius-xs);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-left: 8px;
        }
        .nav-list a.nav-cta i {
            font-size: 0.8rem;
            transition: transform var(--transition);
        }
        .nav-list a.nav-cta:hover {
            background: var(--accent-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(99, 102, 241, 0.35);
        }
        .nav-list a.nav-cta:hover i {
            transform: translateX(3px);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px 4px;
            background: none;
            border: none;
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 2px;
            transition: all var(--transition);
        }
        .nav-toggle.open span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Hero / Banner ===== */
        .page-banner {
            position: relative;
            padding: 140px 0 80px 0;
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            overflow: hidden;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 30%, rgba(15, 23, 42, 0.50) 80%);
            z-index: 1;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
            z-index: 1;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .page-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.55);
            margin-bottom: 20px;
        }
        .page-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.65);
            text-decoration: none;
            transition: color var(--transition);
        }
        .page-banner .breadcrumb a:hover {
            color: #fff;
        }
        .page-banner .breadcrumb span {
            color: rgba(255, 255, 255, 0.4);
        }
        .page-banner h1 {
            font-size: 3rem;
            font-weight: 900;
            color: #fff;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
            line-height: 1.2;
        }
        .page-banner .banner-desc {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 620px;
            line-height: 1.7;
        }
        .page-banner .banner-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 28px;
        }
        .page-banner .banner-badges span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            border-radius: 20px;
            background: rgba(255, 255, 255, 0.10);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.85);
        }
        .page-banner .banner-badges span i {
            color: var(--accent-light);
            font-size: 0.75rem;
        }

        /* ===== 板块通用 ===== */
        .band-light {
            background: var(--bg);
        }
        .band-alt {
            background: var(--bg-alt);
        }
        .band-dark {
            background: var(--primary);
            color: #fff;
        }
        .band-dark .section-title,
        .band-dark .section-sub {
            color: #fff;
        }
        .band-dark .section-sub {
            color: rgba(255, 255, 255, 0.7);
        }
        .band-accent {
            background: linear-gradient(135deg, var(--primary) 0%, #1a1a3e 100%);
            color: #fff;
        }
        .band-accent .section-title,
        .band-accent .section-sub {
            color: #fff;
        }
        .band-accent .section-sub {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 28px 24px;
            transition: all var(--transition);
            border: 1px solid var(--border-light);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--border);
        }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: #fff;
            margin-bottom: 16px;
            background: var(--accent);
            background: linear-gradient(135deg, var(--accent), var(--accent-hover));
        }
        .card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }
        .card .badge {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 12px;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--accent-bg);
            color: var(--accent);
            margin-bottom: 10px;
        }
        .card-cover {
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--bg-card);
            box-shadow: var(--shadow);
            transition: all var(--transition);
            border: 1px solid var(--border-light);
        }
        .card-cover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--border);
        }
        .card-cover .cover-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .card-cover .cover-body {
            padding: 20px 20px 24px;
        }
        .card-cover .cover-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .card-cover .cover-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .card-cover .cover-body .cover-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 12px;
            font-size: 0.72rem;
            font-weight: 600;
            background: var(--accent-bg);
            color: var(--accent);
            margin-bottom: 10px;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 28px;
            border-radius: var(--radius-xs);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(99, 102, 241, 0.30);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: var(--accent);
            border: 2px solid var(--accent);
        }
        .btn-outline:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
        }
        .btn-white:hover {
            background: var(--accent-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(255, 255, 255, 0.20);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
        }
        .btn i {
            font-size: 0.85em;
            transition: transform var(--transition);
        }
        .btn:hover i {
            transform: translateX(3px);
        }

        /* ===== 统计数字块 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 28px 16px;
            border-radius: var(--radius);
            background: rgba(255, 255, 255, 0.06);
            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, 0.10);
            transform: translateY(-3px);
        }
        .stat-item .stat-number {
            font-size: 2.4rem;
            font-weight: 900;
            color: #fff;
            letter-spacing: -0.02em;
            line-height: 1.2;
        }
        .stat-item .stat-number .accent {
            color: var(--accent-light);
        }
        .stat-item .stat-label {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.65);
            margin-top: 6px;
        }

        /* ===== 流程步骤 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-card {
            counter-increment: step;
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 20px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            position: relative;
            text-align: center;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .step-card::before {
            content: counter(step);
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            font-size: 0.9rem;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
        }
        .step-card .step-icon {
            font-size: 2rem;
            color: var(--accent);
            margin-bottom: 12px;
            margin-top: 4px;
        }
        .step-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .step-card p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border);
        }
        .faq-item.open {
            border-color: var(--accent);
            box-shadow: var(--shadow);
        }
        .faq-question {
            width: 100%;
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            background: none;
            border: none;
            cursor: pointer;
            text-align: left;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--accent-bg);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
            transition: all var(--transition);
        }
        .faq-item.open .faq-question .faq-icon {
            background: var(--accent);
            color: #fff;
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 22px 18px 22px;
            font-size: 0.93rem;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-box {
            background: linear-gradient(135deg, var(--primary) 0%, #1a1a3e 100%);
            border-radius: var(--radius);
            padding: 56px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.06);
        }
        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 0%, rgba(99, 102, 241, 0.10) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-box h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            position: relative;
        }
        .cta-box p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 520px;
            margin: 0 auto 28px auto;
            position: relative;
        }
        .cta-box .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
            position: relative;
        }

        /* ===== 图文区块 ===== */
        .media-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .media-block.reverse {
            direction: rtl;
        }
        .media-block.reverse>* {
            direction: ltr;
        }
        .media-block .media-img {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .media-block .media-img img {
            width: 100%;
            height: 340px;
            object-fit: cover;
            display: block;
            transition: transform 0.5s ease;
        }
        .media-block .media-img:hover img {
            transform: scale(1.02);
        }
        .media-block .media-content h2 {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }
        .media-block .media-content p {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: 16px;
        }
        .media-block .media-content .media-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-top: 16px;
        }
        .media-block .media-content .media-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.93rem;
            color: var(--text-secondary);
        }
        .media-block .media-content .media-list li i {
            color: var(--accent);
            margin-top: 3px;
            flex-shrink: 0;
        }

        /* ===== 标签列表 ===== */
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag-list a {
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.82rem;
            font-weight: 500;
            background: var(--bg-alt);
            color: var(--text-secondary);
            border: 1px solid var(--border-light);
            text-decoration: none;
            transition: all var(--transition);
        }
        .tag-list a:hover {
            background: var(--accent-bg);
            color: var(--accent);
            border-color: var(--accent);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.8);
            padding: 56px 0 32px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .site-footer .footer-brand .site-logo {
            font-size: 1.2rem;
            color: #fff;
            margin-bottom: 14px;
        }
        .site-footer .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.7;
            max-width: 320px;
        }
        .site-footer .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .site-footer .footer-col a {
            display: block;
            padding: 5px 0;
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.55);
            text-decoration: none;
            transition: all var(--transition);
        }
        .site-footer .footer-col a:hover {
            color: var(--accent-light);
            padding-left: 4px;
        }
        .site-footer .footer-col a i {
            margin-right: 8px;
            width: 18px;
            text-align: center;
            color: rgba(255, 255, 255, 0.3);
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .site-footer .footer-bottom span {
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .media-block {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .media-block.reverse {
                direction: ltr;
            }
            .media-block .media-img img {
                height: 260px;
            }
            .page-banner h1 {
                font-size: 2.4rem;
            }
        }
        @media (max-width: 768px) {
            :root {
                --nav-height: 64px;
            }
            .nav-list {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                width: 100%;
                flex-direction: column;
                background: rgba(15, 23, 42, 0.97);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                pointer-events: none;
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
                border-radius: 0 0 var(--radius) var(--radius);
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
                border-radius: var(--radius-xs);
            }
            .nav-list a.nav-cta {
                margin-left: 0;
                margin-top: 8px;
                justify-content: center;
            }
            .nav-list a.active::after {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .section-sub {
                font-size: 0.95rem;
                margin-bottom: 32px;
            }
            .section-padding {
                padding: 56px 0;
            }
            .section-padding-sm {
                padding: 40px 0;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-item .stat-number {
                font-size: 1.8rem;
            }
            .page-banner {
                padding: 120px 0 56px 0;
            }
            .page-banner h1 {
                font-size: 2rem;
            }
            .page-banner .banner-desc {
                font-size: 1rem;
            }
            .cta-box {
                padding: 40px 24px;
            }
            .cta-box h2 {
                font-size: 1.5rem;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .site-footer .footer-brand p {
                max-width: 100%;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .media-block .media-img img {
                height: 200px;
            }
            .card {
                padding: 20px 18px;
            }
            .container {
                padding: 0 16px;
            }
            .header-inner {
                padding: 0 16px;
            }
        }
        @media (max-width: 520px) {
            .page-banner h1 {
                font-size: 1.6rem;
            }
            .section-title {
                font-size: 1.35rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 20px 12px;
            }
            .stat-item .stat-number {
                font-size: 1.5rem;
            }
            .cta-box {
                padding: 32px 16px;
            }
            .cta-box h2 {
                font-size: 1.25rem;
            }
            .btn {
                padding: 10px 20px;
                font-size: 0.88rem;
            }
            .faq-question {
                font-size: 0.92rem;
                padding: 14px 16px;
            }
            .faq-answer {
                font-size: 0.85rem;
                padding: 0 16px 14px 16px;
            }
            .card-cover .cover-img {
                height: 160px;
            }
            .media-block .media-img img {
                height: 170px;
            }
        }

        /* ===== 辅助 ===== */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        .divider {
            height: 1px;
            background: var(--border);
            margin: 12px 0;
        }
        .accent-text {
            color: var(--accent);
        }
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .mb-32 {
            margin-bottom: 32px;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }

        /* ===== 滚动渐入动画 ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }