/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #6C5CE7;
            --primary-dark: #5A4BD1;
            --primary-light: #A29BFE;
            --secondary: #00B894;
            --secondary-dark: #00A381;
            --secondary-light: #55EFC4;
            --accent: #FD79A8;
            --bg: #FFFFFF;
            --bg-alt: #F8F9FE;
            --bg-dark: #1A1A2E;
            --text: #2D3436;
            --text-light: #636E72;
            --text-lighter: #B2BEC3;
            --text-on-dark: #F8F9FA;
            --border: #E8E8F0;
            --border-light: #F0F0F8;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(108,92,231,0.06);
            --shadow-md: 0 6px 24px rgba(108,92,231,0.10);
            --shadow-lg: 0 16px 48px rgba(108,92,231,0.14);
            --shadow-xl: 0 24px 64px rgba(108,92,231,0.18);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --max-width: 1200px;
            --nav-height: 72px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --gradient-primary: linear-gradient(135deg, #6C5CE7 0%, #A29BFE 100%);
            --gradient-hero: linear-gradient(160deg, #1A1A2E 0%, #2D2B55 40%, #6C5CE7 100%);
            --gradient-card: linear-gradient(145deg, #FFFFFF 0%, #F8F9FE 100%);
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        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: 3px solid var(--primary-light); outline-offset: 2px; border-radius: 4px; }
        button, input, select, textarea { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        h1 { font-size: clamp(2.2rem, 6vw, 3.8rem); }
        h2 { font-size: clamp(1.6rem, 4vw, 2.6rem); }
        h3 { font-size: clamp(1.2rem, 2.8vw, 1.7rem); }
        h4 { font-size: clamp(1.05rem, 2vw, 1.3rem); }
        p { margin-bottom: 0.8rem; color: var(--text-light); }
        .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .container-narrow { max-width: 880px; margin: 0 auto; padding: 0 24px; }
        .section { padding: 80px 0; }
        .section-alt { background: var(--bg-alt); }
        .section-dark { background: var(--bg-dark); color: var(--text-on-dark); }
        .section-dark h2, .section-dark h3, .section-dark p { color: var(--text-on-dark); }
        .section-title { text-align: center; margin-bottom: 16px; }
        .section-subtitle { text-align: center; color: var(--text-light); max-width: 640px; margin: 0 auto 48px; font-size: 1.1rem; }
        .section-dark .section-subtitle { color: rgba(255,255,255,0.7); }
        .badge {
            display: inline-block; padding: 4px 16px; border-radius: 100px;
            font-size: 0.8rem; font-weight: 600; letter-spacing: 0.3px;
            background: var(--primary-light); color: var(--bg); text-transform: none;
        }
        .badge-secondary { background: var(--secondary-light); color: var(--bg-dark); }
        .badge-accent { background: var(--accent); color: var(--bg); }
        .divider { width: 60px; height: 4px; background: var(--gradient-primary); border-radius: 4px; margin: 20px auto 24px; }

        /* ===== Button ===== */
        .btn {
            display: inline-flex; align-items: center; gap: 10px; padding: 12px 32px;
            border-radius: 50px; font-weight: 600; font-size: 1rem; line-height: 1.4;
            transition: all var(--transition); border: 2px solid transparent;
            text-align: center; justify-content: center;
        }
        .btn-primary {
            background: var(--gradient-primary); color: #fff; border-color: transparent;
            box-shadow: 0 4px 16px rgba(108,92,231,0.3);
        }
        .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(108,92,231,0.4); color: #fff; }
        .btn-primary:active { transform: translateY(0); }
        .btn-secondary {
            background: transparent; color: var(--primary); border-color: var(--primary);
        }
        .btn-secondary:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-2px); }
        .btn-light {
            background: rgba(255,255,255,0.15); color: #fff; border-color: rgba(255,255,255,0.3);
            backdrop-filter: blur(4px);
        }
        .btn-light:hover { background: rgba(255,255,255,0.25); color: #fff; transform: translateY(-2px); }
        .btn-lg { padding: 16px 44px; font-size: 1.1rem; }
        .btn-sm { padding: 8px 20px; font-size: 0.85rem; }
        .btn:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 3px; }

        /* ===== Navigation ===== */
        .site-header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            height: var(--nav-height); background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid var(--border-light);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled { background: rgba(255,255,255,0.98); box-shadow: 0 2px 24px 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; gap: 20px;
        }
        .logo { 
            font-size: 1.5rem; font-weight: 800; color: var(--primary); 
            display: flex; align-items: center; gap: 8px; white-space: nowrap;
            letter-spacing: -0.3px; flex-shrink: 0;
        }
        .logo i { font-size: 1.6rem; color: var(--secondary); }
        .logo span { background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo:hover { color: var(--primary); opacity: 0.9; }

        /* 搜索框 - 视觉中心 */
        .nav-search {
            flex: 1; max-width: 480px; margin: 0 auto; position: relative;
        }
        .nav-search form { display: flex; align-items: center; width: 100%; }
        .nav-search input {
            width: 100%; padding: 10px 20px 10px 48px; border: 2px solid var(--border);
            border-radius: 50px; background: var(--bg-alt); font-size: 0.95rem;
            transition: all var(--transition); color: var(--text);
        }
        .nav-search input:focus { border-color: var(--primary); background: var(--bg); box-shadow: 0 0 0 4px rgba(108,92,231,0.1); outline: none; }
        .nav-search input::placeholder { color: var(--text-lighter); }
        .nav-search .search-icon {
            position: absolute; left: 18px; top: 50%; transform: translateY(-50%);
            color: var(--text-lighter); font-size: 1rem; pointer-events: none;
        }

        .nav-links { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
        .nav-links a {
            padding: 8px 18px; border-radius: 50px; font-weight: 500; font-size: 0.95rem;
            color: var(--text-light); transition: all var(--transition); white-space: nowrap;
        }
        .nav-links a:hover { color: var(--primary); background: rgba(108,92,231,0.08); }
        .nav-links a.active { color: var(--primary); background: rgba(108,92,231,0.12); font-weight: 600; }
        .nav-links a:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; }

        .nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; flex-shrink: 0; }
        .nav-toggle span { display: block; width: 26px; height: 3px; background: var(--text); border-radius: 3px; transition: all var(--transition); }
        .nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); }
        .nav-toggle.open span:nth-child(2) { opacity: 0; }
        .nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); }

        /* ===== Hero ===== */
        .hero {
            min-height: 100vh; display: flex; align-items: center; justify-content: center;
            background: var(--gradient-hero); position: relative; overflow: hidden;
            padding: calc(var(--nav-height) + 40px) 24px 80px;
        }
        .hero::before {
            content: ''; position: absolute; inset: 0;
            background: url("data:image/svg+xml,%3Csvg viewBox='0 0 800 800' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.015' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(/%23n)' opacity='0.12'/%3E%3C/svg%3E");
            pointer-events: none;
        }
        .hero-glow {
            position: absolute; width: 600px; height: 600px; border-radius: 50%;
            background: radial-gradient(circle, rgba(108,92,231,0.25) 0%, transparent 70%);
            top: -200px; right: -150px; pointer-events: none;
        }
        .hero-glow-2 {
            position: absolute; width: 500px; height: 500px; border-radius: 50%;
            background: radial-gradient(circle, rgba(0,184,148,0.15) 0%, transparent 70%);
            bottom: -150px; left: -100px; pointer-events: none;
        }
        .hero-content { position: relative; z-index: 2; text-align: center; max-width: 820px; }
        .hero .badge { margin-bottom: 24px; display: inline-block; background: rgba(255,255,255,0.15); color: var(--text-on-dark); border: 1px solid rgba(255,255,255,0.2); }
        .hero h1 { color: var(--text-on-dark); margin-bottom: 20px; letter-spacing: -0.5px; }
        .hero h1 .highlight { background: linear-gradient(135deg, #A29BFE, #55EFC4); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero p { color: rgba(255,255,255,0.75); font-size: 1.2rem; max-width: 600px; margin: 0 auto 36px; line-height: 1.8; }
        .hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
        .hero-stats { display: flex; gap: 40px; justify-content: center; margin-top: 56px; flex-wrap: wrap; }
        .hero-stat { text-align: center; }
        .hero-stat .num { font-size: 2.4rem; font-weight: 800; color: var(--text-on-dark); line-height: 1.2; }
        .hero-stat .num span { color: var(--secondary-light); }
        .hero-stat .label { font-size: 0.9rem; color: rgba(255,255,255,0.6); margin-top: 4px; }

        /* ===== Features ===== */
        .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .feature-card {
            background: var(--gradient-card); border-radius: var(--radius-lg); padding: 40px 32px;
            border: 1px solid var(--border-light); transition: all var(--transition);
            box-shadow: var(--shadow-sm); position: relative; overflow: hidden;
        }
        .feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: var(--primary-light); }
        .feature-card .icon {
            width: 56px; height: 56px; border-radius: var(--radius-md);
            display: flex; align-items: center; justify-content: center;
            font-size: 1.6rem; color: #fff; margin-bottom: 20px;
        }
        .feature-card .icon.purple { background: var(--gradient-primary); }
        .feature-card .icon.green { background: linear-gradient(135deg, #00B894, #55EFC4); }
        .feature-card .icon.pink { background: linear-gradient(135deg, #FD79A8, #FDCB6E); }
        .feature-card h3 { margin-bottom: 12px; }
        .feature-card p { font-size: 0.95rem; margin-bottom: 0; }

        /* ===== Category / 平台使用指南 ===== */
        .category-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
        .category-card {
            background: var(--gradient-card); border-radius: var(--radius-lg); padding: 32px 28px;
            border: 1px solid var(--border-light); transition: all var(--transition);
            box-shadow: var(--shadow-sm); text-align: center;
            display: flex; flex-direction: column; align-items: center; gap: 12px;
        }
        .category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--primary-light); }
        .category-card .cat-icon {
            width: 64px; height: 64px; border-radius: 50%;
            background: rgba(108,92,231,0.1); color: var(--primary);
            display: flex; align-items: center; justify-content: center;
            font-size: 1.6rem; transition: all var(--transition);
        }
        .category-card:hover .cat-icon { background: var(--primary); color: #fff; transform: scale(1.05); }
        .category-card h4 { font-size: 1.15rem; }
        .category-card p { font-size: 0.9rem; margin-bottom: 0; flex: 1; }
        .category-card .tag-list { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 8px; }
        .category-card .tag {
            padding: 4px 14px; border-radius: 100px; font-size: 0.75rem; font-weight: 500;
            background: var(--bg-alt); color: var(--text-light); border: 1px solid var(--border);
        }

        /* ===== Latest Posts (CMS) ===== */
        .posts-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 28px; }
        .post-card {
            background: var(--gradient-card); border-radius: var(--radius-lg); overflow: hidden;
            border: 1px solid var(--border-light); transition: all var(--transition);
            box-shadow: var(--shadow-sm); display: flex; flex-direction: column;
        }
        .post-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: var(--primary-light); }
        .post-card .post-thumb {
            width: 100%; height: 200px; background: var(--bg-alt); position: relative;
            display: flex; align-items: center; justify-content: center;
            color: var(--text-lighter); font-size: 2.8rem; overflow: hidden;
        }
        .post-card .post-thumb img { width: 100%; height: 100%; object-fit: cover; }
        .post-card .post-thumb .placeholder-icon { opacity: 0.5; }
        .post-card .post-cat {
            position: absolute; top: 14px; left: 14px; padding: 4px 14px;
            border-radius: 100px; font-size: 0.75rem; font-weight: 600;
            background: var(--primary); color: #fff;
        }
        .post-card .post-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
        .post-card .post-body h3 { font-size: 1.1rem; margin-bottom: 10px; flex: 1; }
        .post-card .post-body h3 a { color: var(--text); }
        .post-card .post-body h3 a:hover { color: var(--primary); }
        .post-card .post-body p { font-size: 0.9rem; margin-bottom: 16px; flex: 1; }
        .post-card .post-meta { display: flex; justify-content: space-between; align-items: center; font-size: 0.82rem; color: var(--text-lighter); border-top: 1px solid var(--border-light); padding-top: 16px; margin-top: auto; }
        .post-card .post-meta i { margin-right: 4px; }

        .empty-posts { text-align: center; padding: 60px 20px; color: var(--text-lighter); grid-column: 1 / -1; }
        .empty-posts i { font-size: 3rem; margin-bottom: 16px; display: block; }
        .empty-posts p { font-size: 1.1rem; }

        /* ===== 数据统计 ===== */
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
        .stat-card {
            background: rgba(255,255,255,0.06); backdrop-filter: blur(8px);
            border-radius: var(--radius-lg); padding: 36px 24px; text-align: center;
            border: 1px solid rgba(255,255,255,0.08); transition: all var(--transition);
        }
        .stat-card:hover { background: rgba(255,255,255,0.10); border-color: rgba(255,255,255,0.15); transform: translateY(-3px); }
        .stat-card .num { font-size: 2.8rem; font-weight: 800; color: var(--secondary-light); line-height: 1.2; }
        .stat-card .num .suffix { font-size: 1.4rem; color: rgba(255,255,255,0.5); }
        .stat-card .label { color: rgba(255,255,255,0.7); font-size: 0.95rem; margin-top: 8px; }

        /* ===== 使用流程 ===== */
        .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; }
        .steps::before {
            content: ''; position: absolute; top: 40px; left: 10%; right: 10%;
            height: 3px; background: linear-gradient(90deg, var(--primary), var(--secondary), var(--primary-light));
            border-radius: 3px; z-index: 0;
        }
        .step-card {
            background: var(--gradient-card); border-radius: var(--radius-lg); padding: 32px 24px;
            border: 1px solid var(--border-light); text-align: center; position: relative; z-index: 1;
            box-shadow: var(--shadow-sm); transition: all var(--transition);
        }
        .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .step-card .step-num {
            width: 52px; height: 52px; border-radius: 50%; margin: 0 auto 16px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.4rem; font-weight: 800; color: #fff;
            background: var(--gradient-primary); box-shadow: 0 4px 16px rgba(108,92,231,0.25);
        }
        .step-card h4 { margin-bottom: 8px; }
        .step-card p { font-size: 0.9rem; margin-bottom: 0; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--bg); border-radius: var(--radius-md); border: 1px solid var(--border);
            overflow: hidden; transition: all var(--transition); box-shadow: var(--shadow-sm);
        }
        .faq-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow-md); }
        .faq-item .faq-q {
            padding: 20px 28px; display: flex; justify-content: space-between; align-items: center;
            font-weight: 600; font-size: 1.05rem; cursor: pointer; color: var(--text);
            background: transparent; transition: background var(--transition); gap: 16px;
        }
        .faq-item .faq-q:hover { background: rgba(108,92,231,0.03); }
        .faq-item .faq-q i { color: var(--primary); font-size: 1.1rem; transition: transform var(--transition); flex-shrink: 0; }
        .faq-item.open .faq-q i { transform: rotate(180deg); }
        .faq-item .faq-a {
            max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 28px; color: var(--text-light); font-size: 0.95rem; line-height: 1.8;
        }
        .faq-item.open .faq-a { max-height: 300px; padding: 0 28px 20px; }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--gradient-hero); position: relative; overflow: hidden;
            padding: 100px 0; text-align: center;
        }
        .cta-section::before {
            content: ''; position: absolute; inset: 0;
            background: url("data:image/svg+xml,%3Csvg viewBox='0 0 800 800' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.01' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(/%23n)' opacity='0.08'/%3E%3C/svg%3E");
            pointer-events: none;
        }
        .cta-content { position: relative; z-index: 2; }
        .cta-content h2 { color: var(--text-on-dark); margin-bottom: 16px; }
        .cta-content p { color: rgba(255,255,255,0.75); max-width: 560px; margin: 0 auto 32px; font-size: 1.1rem; }
        .cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark); color: rgba(255,255,255,0.7); padding: 60px 0 30px;
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-brand .logo { color: var(--text-on-dark); margin-bottom: 16px; }
        .footer-brand .logo span { -webkit-text-fill-color: #fff; }
        .footer-brand p { font-size: 0.92rem; color: rgba(255,255,255,0.55); max-width: 320px; }
        .footer-col h5 { color: var(--text-on-dark); margin-bottom: 16px; font-size: 1rem; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.55); font-size: 0.92rem; transition: color var(--transition); }
        .footer-col ul li a:hover { color: var(--secondary-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: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--secondary-light); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .steps { grid-template-columns: repeat(2, 1fr); }
            .steps::before { display: none; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            .nav-links { display: none; }
            .nav-links.open { display: flex; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(16px); padding: 16px 24px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-md); gap: 4px; }
            .nav-links a { padding: 12px 20px; width: 100%; border-radius: var(--radius-sm); }
            .nav-toggle { display: flex; }
            .nav-search { max-width: 200px; }
            .nav-search input { padding: 8px 12px 8px 38px; font-size: 0.85rem; }
            .nav-search .search-icon { left: 14px; font-size: 0.85rem; }

            .hero { min-height: auto; padding: calc(var(--nav-height) + 40px) 20px 60px; }
            .hero h1 { font-size: clamp(1.8rem, 8vw, 2.6rem); }
            .hero p { font-size: 1rem; }
            .hero-stats { gap: 24px; margin-top: 36px; }
            .hero-stat .num { font-size: 1.8rem; }

            .section { padding: 56px 0; }
            .features-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
            .stat-card { padding: 24px 16px; }
            .stat-card .num { font-size: 2rem; }

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

            .posts-grid { grid-template-columns: 1fr; }

            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .footer-bottom { flex-direction: column; text-align: center; }

            .cta-section { padding: 60px 0; }
        }

        @media (max-width: 520px) {
            .header-inner { gap: 10px; padding: 0 16px; }
            .logo { font-size: 1.2rem; }
            .logo i { font-size: 1.2rem; }
            .nav-search { max-width: 140px; }
            .nav-search input { padding: 6px 10px 6px 32px; font-size: 0.8rem; }
            .nav-search .search-icon { left: 10px; font-size: 0.8rem; }

            .hero h1 { font-size: 1.6rem; }
            .hero p { font-size: 0.95rem; }
            .hero-actions .btn { padding: 10px 24px; font-size: 0.9rem; }
            .hero-stats { gap: 16px; }
            .hero-stat .num { font-size: 1.4rem; }

            .section-title { font-size: 1.4rem; }
            .section-subtitle { font-size: 0.95rem; }

            .features-grid { gap: 16px; }
            .feature-card { padding: 28px 20px; }

            .category-grid { grid-template-columns: 1fr; }

            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .stat-card .num { font-size: 1.6rem; }

            .steps { grid-template-columns: 1fr; }

            .posts-grid { gap: 16px; }
            .post-card .post-body { padding: 16px; }

            .faq-item .faq-q { padding: 14px 18px; font-size: 0.95rem; }
            .faq-item .faq-a { padding: 0 18px; font-size: 0.9rem; }
            .faq-item.open .faq-a { padding: 0 18px 14px; }

            .cta-content h2 { font-size: 1.4rem; }
            .cta-content p { font-size: 0.95rem; }

            .footer-grid { gap: 24px; }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #6C5CE7;
            --primary-dark: #5A4BD1;
            --primary-light: #A29BFE;
            --primary-bg: #F8F7FF;
            --accent: #FD79A8;
            --accent-dark: #E84393;
            --accent-light: #FDCB6E;
            --bg: #FFFFFF;
            --bg-alt: #F5F6FA;
            --bg-card: #FFFFFF;
            --text: #1A1A2E;
            --text-light: #636E72;
            --text-muted: #B2BEC3;
            --border: #E8E8F0;
            --border-light: #F0F0F8;
            --shadow-sm: 0 2px 8px rgba(108, 92, 231, 0.06);
            --shadow-md: 0 8px 24px rgba(108, 92, 231, 0.10);
            --shadow-lg: 0 20px 48px rgba(108, 92, 231, 0.14);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --max-width: 1280px;
            --header-h: 72px;
            --space-section: 80px;
            --space-block: 48px;
        }

        /* ===== 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: 1.65;
            color: var(--text);
            background: var(--bg);
        }

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

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

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
            background: none;
        }

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }

        h1 {
            font-size: clamp(2rem, 5vw, 3.2rem);
        }
        h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
        }
        h3 {
            font-size: clamp(1.2rem, 2vw, 1.5rem);
        }
        h4 {
            font-size: 1.15rem;
        }
        h5 {
            font-size: 1rem;
        }

        p {
            margin-bottom: 1em;
            color: var(--text-light);
        }

        p:last-child {
            margin-bottom: 0;
        }

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

        .container-narrow {
            max-width: 960px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: var(--header-h);
            box-shadow: 0 1px 12px rgba(108, 92, 231, 0.04);
        }

        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--text);
            flex-shrink: 0;
            letter-spacing: -0.3px;
        }

        .logo i {
            font-size: 1.6rem;
            color: var(--primary);
            background: var(--primary-bg);
            padding: 6px;
            border-radius: var(--radius-sm);
        }

        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        /* 搜索框 */
        .nav-search {
            flex: 1;
            max-width: 480px;
            min-width: 160px;
        }

        .nav-search form {
            position: relative;
            display: flex;
            align-items: center;
            background: var(--bg-alt);
            border-radius: var(--radius-xl);
            padding: 0 16px;
            height: 44px;
            border: 2px solid transparent;
            transition: border var(--transition), background var(--transition);
        }

        .nav-search form:focus-within {
            border-color: var(--primary-light);
            background: var(--bg);
            box-shadow: 0 0 0 4px rgba(108, 92, 231, 0.08);
        }

        .nav-search .search-icon {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-right: 10px;
            flex-shrink: 0;
        }

        .nav-search input {
            flex: 1;
            height: 100%;
            font-size: 0.95rem;
            background: transparent;
            color: var(--text);
            padding: 0;
        }

        .nav-search input::placeholder {
            color: var(--text-muted);
            font-weight: 400;
        }

        /* 导航链接 */
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-shrink: 0;
        }

        .nav-links a {
            padding: 8px 18px;
            border-radius: var(--radius-xl);
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-light);
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }

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

        .nav-links a.active {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(108, 92, 231, 0.30);
        }

        .nav-links a.active:hover {
            background: var(--primary-dark);
        }

        /* 移动端汉堡 */
        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: var(--bg-alt);
            gap: 5px;
            padding: 8px;
            flex-shrink: 0;
            transition: background var(--transition);
        }

        .nav-toggle:hover {
            background: var(--border-light);
        }

        .nav-toggle span {
            display: block;
            width: 22px;
            height: 2.5px;
            background: var(--text);
            border-radius: 4px;
            transition: all var(--transition);
        }

        /* ===== 移动端菜单 ===== */
        @media (max-width: 820px) {
            .nav-links {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px 24px 28px;
                gap: 8px;
                border-bottom: 1px solid var(--border-light);
                box-shadow: var(--shadow-md);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
                border-radius: 0 0 var(--radius-md) var(--radius-md);
                z-index: 999;
            }

            .nav-links.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }

            .nav-links a {
                width: 100%;
                text-align: center;
                padding: 12px 20px;
                font-size: 1.05rem;
                border-radius: var(--radius-md);
            }

            .nav-toggle {
                display: flex;
            }

            .nav-search {
                max-width: none;
                min-width: 0;
                flex: 1;
            }

            .header-inner {
                gap: 12px;
            }
        }

        @media (max-width: 480px) {
            .header-inner {
                padding: 0 14px;
                gap: 8px;
            }

            .logo span {
                font-size: 1.1rem;
            }

            .nav-search form {
                height: 40px;
                padding: 0 12px;
            }

            .nav-search input {
                font-size: 0.85rem;
            }
        }

        /* ===== Hero ===== */
        .page-hero {
            padding: 60px 0 56px;
            background: linear-gradient(160deg, var(--primary-bg) 0%, #EDE7F6 100%);
            position: relative;
            overflow: hidden;
        }

        .page-hero::after {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(162, 155, 254, 0.20) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .page-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .page-hero h1 {
            font-size: clamp(2rem, 5vw, 3rem);
            font-weight: 800;
            margin-bottom: 16px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .page-hero p {
            font-size: 1.15rem;
            max-width: 680px;
            margin: 0 auto 20px;
            color: var(--text-light);
            line-height: 1.7;
        }

        .page-hero .hero-badges {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin-top: 12px;
        }

        .hero-badges span {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.75);
            backdrop-filter: blur(4px);
            padding: 8px 18px;
            border-radius: var(--radius-xl);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text);
            border: 1px solid rgba(255, 255, 255, 0.6);
            box-shadow: var(--shadow-sm);
        }

        .hero-badges span i {
            color: var(--primary);
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            padding: 16px 0 0;
            font-size: 0.88rem;
            color: var(--text-muted);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px;
        }

        .breadcrumb a {
            color: var(--text-light);
        }

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

        .breadcrumb .sep {
            color: var(--text-muted);
            font-size: 0.75rem;
        }

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

        /* ===== 分类介绍 ===== */
        .section-intro {
            padding: var(--space-section) 0;
            background: var(--bg);
        }

        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .intro-content h2 {
            margin-bottom: 20px;
        }

        .intro-content p {
            margin-bottom: 20px;
            font-size: 1.05rem;
        }

        .intro-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin-top: 28px;
        }

        .stat-item {
            background: var(--primary-bg);
            padding: 20px 16px;
            border-radius: var(--radius-md);
            text-align: center;
            border: 1px solid var(--border-light);
            transition: transform var(--transition), box-shadow var(--transition);
        }

        .stat-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .stat-item .num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            display: block;
            line-height: 1.2;
        }

        .stat-item .label {
            font-size: 0.85rem;
            color: var(--text-light);
            margin-top: 6px;
        }

        .intro-visual {
            background: var(--bg-alt);
            border-radius: var(--radius-lg);
            padding: 32px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            min-height: 300px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
        }

        .intro-visual i {
            font-size: 3.6rem;
            color: var(--primary-light);
            margin-bottom: 16px;
        }

        .intro-visual h4 {
            margin-bottom: 8px;
        }

        .intro-visual p {
            font-size: 0.95rem;
            max-width: 360px;
        }

        @media (max-width: 820px) {
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .intro-stats {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 480px) {
            .intro-stats {
                grid-template-columns: 1fr 1fr;
            }
        }

        /* ===== 指南卡片列表 ===== */
        .section-guides {
            padding: var(--space-section) 0;
            background: var(--bg-alt);
        }

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

        .section-header h2 {
            margin-bottom: 12px;
        }

        .section-header p {
            max-width: 600px;
            margin: 0 auto;
            color: var(--text-light);
            font-size: 1.05rem;
        }

        .guides-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }

        .guide-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 24px 24px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: transform var(--transition), box-shadow var(--transition);
            display: flex;
            flex-direction: column;
        }

        .guide-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }

        .guide-card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 16px;
            transition: background var(--transition), color var(--transition);
        }

        .guide-card:hover .card-icon {
            background: var(--primary);
            color: #fff;
        }

        .guide-card h3 {
            font-size: 1.15rem;
            margin-bottom: 10px;
        }

        .guide-card p {
            font-size: 0.95rem;
            color: var(--text-light);
            flex: 1;
            margin-bottom: 16px;
        }

        .guide-card .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 16px;
        }

        .guide-card .card-tags span {
            background: var(--bg-alt);
            padding: 4px 12px;
            border-radius: var(--radius-xl);
            font-size: 0.78rem;
            font-weight: 500;
            color: var(--text-light);
        }

        .guide-card .card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 14px;
            border-top: 1px solid var(--border-light);
        }

        .guide-card .card-footer .btn-text {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition);
        }

        .guide-card .card-footer .btn-text:hover {
            gap: 10px;
        }

        .guide-card .card-footer .meta {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* ===== 步骤流程 ===== */
        .section-steps {
            padding: var(--space-section) 0;
            background: var(--bg);
        }

        .steps-timeline {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px 24px;
            position: relative;
            counter-reset: step;
        }

        .step-item {
            counter-increment: step;
            text-align: center;
            padding: 28px 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: transform var(--transition), box-shadow var(--transition);
            position: relative;
        }

        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .step-item::before {
            content: counter(step);
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            font-size: 1.2rem;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 4px 12px rgba(108, 92, 231, 0.25);
        }

        .step-item h4 {
            margin-bottom: 8px;
            font-size: 1.05rem;
        }

        .step-item p {
            font-size: 0.9rem;
            color: var(--text-light);
            margin: 0;
        }

        /* ===== FAQ ===== */
        .section-faq {
            padding: var(--space-section) 0;
            background: var(--bg-alt);
        }

        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }

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

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            background: transparent;
            text-align: left;
            gap: 16px;
            transition: background var(--transition);
        }

        .faq-question:hover {
            background: var(--primary-bg);
        }

        .faq-question i {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: transform var(--transition);
            flex-shrink: 0;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            max-height: 0;
            padding: 0 24px;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
            border-top: 0 solid var(--border-light);
        }

        .faq-item.open .faq-answer {
            max-height: 320px;
            padding: 16px 24px 20px;
            border-top-width: 1px;
        }

        /* ===== CTA ===== */
        .section-cta {
            padding: var(--space-section) 0;
            background: linear-gradient(160deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #fff;
            text-align: center;
        }

        .section-cta h2 {
            color: #fff;
            margin-bottom: 16px;
        }

        .section-cta p {
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 28px;
            font-size: 1.05rem;
        }

        .section-cta .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: var(--radius-xl);
            font-size: 1rem;
            font-weight: 600;
            transition: all var(--transition);
            border: 2px solid transparent;
        }

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

        .btn-primary:hover {
            background: transparent;
            color: #fff;
            border-color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }

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

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.15);
            border-color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--text);
            color: rgba(255, 255, 255, 0.80);
            padding: 56px 0 24px;
        }

        .site-footer .logo {
            color: #fff;
            margin-bottom: 12px;
        }

        .site-footer .logo i {
            background: rgba(255, 255, 255, 0.10);
            color: var(--primary-light);
        }

        .site-footer .logo span {
            -webkit-text-fill-color: #fff;
            background: none;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 36px;
        }

        .footer-brand p {
            color: rgba(255, 255, 255, 0.60);
            font-size: 0.92rem;
            max-width: 340px;
            margin-top: 8px;
        }

        .footer-col h5 {
            color: #fff;
            margin-bottom: 16px;
            font-size: 1rem;
            font-weight: 600;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.9rem;
            transition: color var(--transition), padding-left var(--transition);
            display: inline-block;
        }

        .footer-col ul li a:hover {
            color: var(--primary-light);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
        }

        .footer-bottom a {
            color: var(--primary-light);
        }

        .footer-bottom a:hover {
            text-decoration: underline;
        }

        @media (max-width: 820px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
        }

        /* ===== 响应式微调 ===== */
        @media (max-width: 820px) {
            :root {
                --space-section: 56px;
            }
            .page-hero {
                padding: 40px 0 36px;
            }
        }

        @media (max-width: 480px) {
            :root {
                --space-section: 40px;
                --space-block: 32px;
            }
            .page-hero {
                padding: 28px 0 24px;
            }
            .guides-grid {
                grid-template-columns: 1fr;
            }
            .steps-timeline {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 380px) {
            .steps-timeline {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }

        .mt-12 {
            margin-top: 12px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }

        /* ===== 滚动动画 (轻量) ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }

        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #6c5ce7;
            --primary-dark: #5a4bd1;
            --primary-light: #a29bfe;
            --secondary: #fd79a8;
            --accent: #fdcb6e;
            --bg-body: #f8f9fd;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #2d3436;
            --bg-footer: #1e272e;
            --text-primary: #2d3436;
            --text-secondary: #636e72;
            --text-light: #b2bec3;
            --text-white: #ffffff;
            --border-color: #e8ecf1;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
            --shadow-hover: 0 12px 36px rgba(108,92,231,0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1200px;
            --header-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-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            padding-top: var(--header-height);
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
        button { cursor: pointer; background: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
        h1 { font-size: 2.2rem; }
        h2 { font-size: 1.75rem; }
        h3 { font-size: 1.35rem; }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 1rem; }
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            transition: var(--transition);
        }
        .site-header.scrolled { box-shadow: 0 4px 20px rgba(0,0,0,0.06); }
        .header-inner {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            gap: 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            flex-shrink: 0;
        }
        .logo i { font-size: 1.5rem; color: var(--secondary); }
        .logo span { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo:hover { opacity: 0.85; }

        .nav-search {
            flex: 1;
            max-width: 480px;
            margin: 0 auto;
        }
        .nav-search form {
            position: relative;
            width: 100%;
        }
        .nav-search .search-icon {
            position: absolute;
            left: 16px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-light);
            font-size: 0.95rem;
            pointer-events: none;
        }
        .nav-search input {
            width: 100%;
            padding: 10px 18px 10px 44px;
            border-radius: 50px;
            background: var(--bg-body);
            border: 1.5px solid var(--border-color);
            font-size: 0.95rem;
            color: var(--text-primary);
            transition: var(--transition);
        }
        .nav-search input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(108,92,231,0.12);
            background: var(--bg-white);
        }
        .nav-search input::placeholder { color: var(--text-light); }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }
        .nav-links a {
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav-links a:hover { color: var(--primary); background: rgba(108,92,231,0.06); }
        .nav-links a.active {
            color: var(--text-white);
            background: var(--primary);
            box-shadow: 0 4px 12px rgba(108,92,231,0.25);
        }
        .nav-links a.active:hover { background: var(--primary-dark); }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: var(--radius-sm);
            background: var(--bg-body);
            flex-shrink: 0;
        }
        .nav-toggle span {
            display: block;
            width: 22px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 4px;
            transition: 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); }

        /* ===== Article Hero ===== */
        .article-hero {
            background: linear-gradient(135deg, #2d3436 0%, #1e272e 100%);
            padding: 60px 0 50px;
            position: relative;
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -30%;
            width: 80%;
            height: 200%;
            background: radial-gradient(circle at 30% 50%, rgba(108,92,231,0.12), transparent 60%);
            pointer-events: none;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            bottom: -20%;
            right: -10%;
            width: 50%;
            height: 100%;
            background: radial-gradient(circle at 70% 80%, rgba(253,121,168,0.08), transparent 50%);
            pointer-events: none;
        }
        .article-hero .container { position: relative; z-index: 1; }
        .article-hero .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-light);
            margin-bottom: 20px;
        }
        .article-hero .breadcrumb a { color: var(--primary-light); }
        .article-hero .breadcrumb a:hover { color: var(--text-white); }
        .article-hero .breadcrumb .sep { color: var(--text-light); opacity: 0.5; }
        .article-hero .breadcrumb .current { color: var(--text-light); }
        .article-hero h1 {
            font-size: 2.4rem;
            color: var(--text-white);
            max-width: 800px;
            line-height: 1.3;
            margin-bottom: 16px;
            font-weight: 800;
        }
        .article-hero .meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 24px;
            align-items: center;
            color: var(--text-light);
            font-size: 0.9rem;
        }
        .article-hero .meta .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            background: rgba(108,92,231,0.25);
            color: var(--primary-light);
            font-size: 0.8rem;
            font-weight: 600;
        }
        .article-hero .meta i { margin-right: 6px; opacity: 0.7; }

        /* ===== Article Content ===== */
        .article-section {
            padding: 60px 0 80px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            align-items: start;
        }
        .article-body {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 40px 44px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-primary);
        }
        .article-body .content h2,
        .article-body .content h3,
        .article-body .content h4 {
            margin-top: 2em;
            margin-bottom: 0.8em;
            color: var(--text-primary);
        }
        .article-body .content p {
            margin-bottom: 1.2em;
        }
        .article-body .content ul,
        .article-body .content ol {
            margin: 1em 0;
            padding-left: 1.6em;
            list-style: disc;
        }
        .article-body .content ol { list-style: decimal; }
        .article-body .content li { margin-bottom: 0.5em; }
        .article-body .content a { color: var(--primary); text-decoration: underline; }
        .article-body .content a:hover { color: var(--primary-dark); }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            padding: 16px 20px;
            margin: 1.5em 0;
            background: rgba(108,92,231,0.04);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
        }
        .article-body .content img {
            border-radius: var(--radius-md);
            margin: 1.5em auto;
            box-shadow: var(--shadow-sm);
        }
        .article-body .content pre {
            background: var(--bg-dark);
            color: #f8f9fd;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            font-size: 0.9rem;
            margin: 1.5em 0;
        }
        .article-body .content code {
            font-family: 'Fira Code', 'Consolas', monospace;
            font-size: 0.88em;
            background: rgba(108,92,231,0.08);
            padding: 2px 8px;
            border-radius: 4px;
        }
        .article-body .content pre code { background: transparent; padding: 0; }

        .article-not-found {
            text-align: center;
            padding: 80px 20px;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
        }
        .article-not-found i {
            font-size: 3.5rem;
            color: var(--text-light);
            margin-bottom: 20px;
        }
        .article-not-found h2 {
            font-size: 1.6rem;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--text-secondary);
            margin-bottom: 24px;
        }
        .article-not-found .btn {
            display: inline-block;
            padding: 12px 32px;
            border-radius: 50px;
            background: var(--primary);
            color: var(--text-white);
            font-weight: 600;
            transition: var(--transition);
        }
        .article-not-found .btn:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
        }
        .sidebar-card h4 {
            font-size: 1.05rem;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-primary);
        }
        .sidebar-card h4 i { color: var(--primary); }
        .sidebar-card ul li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .sidebar-card ul li:last-child { border-bottom: none; }
        .sidebar-card ul li a {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.4;
        }
        .sidebar-card ul li a:hover { color: var(--primary); }
        .sidebar-card ul li a i {
            margin-top: 3px;
            color: var(--primary-light);
            font-size: 0.8rem;
            flex-shrink: 0;
        }
        .sidebar-card .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-card .tag-cloud a {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            background: var(--bg-body);
            color: var(--text-secondary);
            font-size: 0.82rem;
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid var(--border-color);
        }
        .sidebar-card .tag-cloud a:hover {
            background: var(--primary);
            color: var(--text-white);
            border-color: var(--primary);
            transform: translateY(-1px);
        }
        .sidebar-card .cta-box {
            text-align: center;
            padding: 8px 0;
        }
        .sidebar-card .cta-box p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }
        .sidebar-card .cta-box .btn {
            display: inline-block;
            padding: 10px 28px;
            border-radius: 50px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--text-white);
            font-weight: 600;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(108,92,231,0.25);
        }
        .sidebar-card .cta-box .btn:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(108,92,231,0.35); }

        /* ===== Related Posts ===== */
        .related-section {
            padding: 60px 0 80px;
            background: var(--bg-body);
        }
        .related-section .section-title {
            text-align: center;
            margin-bottom: 40px;
        }
        .related-section .section-title h2 {
            font-size: 1.8rem;
            font-weight: 700;
        }
        .related-section .section-title p {
            color: var(--text-secondary);
            font-size: 1rem;
            margin-top: 8px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .related-card .card-img {
            height: 180px;
            background: linear-gradient(135deg, var(--primary-light), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.5rem;
            color: rgba(255,255,255,0.5);
        }
        .related-card .card-body {
            padding: 20px 22px;
        }
        .related-card .card-body .badge {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 50px;
            background: rgba(108,92,231,0.08);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .related-card .card-body h3 {
            font-size: 1.05rem;
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .related-card .card-body h3 a { color: var(--text-primary); }
        .related-card .card-body h3 a:hover { color: var(--primary); }
        .related-card .card-body p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            margin-bottom: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .date {
            font-size: 0.8rem;
            color: var(--text-light);
            margin-top: 10px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-footer);
            color: var(--text-light);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            font-size: 1.4rem;
            margin-bottom: 16px;
            display: inline-flex;
        }
        .footer-brand .logo span { -webkit-text-fill-color: var(--text-white); color: var(--text-white); }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; color: var(--text-light); max-width: 360px; }
        .footer-col h5 {
            color: var(--text-white);
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 18px;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: var(--text-light);
            font-size: 0.9rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
        }
        .footer-col ul li a:hover { color: var(--primary-light); padding-left: 4px; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-light);
        }
        .footer-bottom a { color: var(--primary-light); }
        .footer-bottom a:hover { color: var(--text-white); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }

        @media (max-width: 768px) {
            :root { --header-height: 64px; }
            .header-inner { gap: 12px; padding: 0 16px; }
            .nav-search { max-width: 100%; margin: 0; }
            .nav-links {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 20px 24px;
                gap: 6px;
                box-shadow: 0 20px 40px rgba(0,0,0,0.12);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                border-bottom: 2px solid var(--border-color);
                border-radius: 0 0 var(--radius-md) var(--radius-md);
            }
            .nav-links.open { transform: translateY(0); opacity: 1; }
            .nav-links a { width: 100%; text-align: center; padding: 12px 18px; }
            .nav-toggle { display: flex; }

            .article-hero { padding: 40px 0 36px; }
            .article-hero h1 { font-size: 1.6rem; }
            .article-body { padding: 24px 20px; }
            .article-section { padding: 40px 0; }

            .article-sidebar { grid-template-columns: 1fr; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }

            .related-card .card-img { height: 140px; }
        }

        @media (max-width: 520px) {
            .header-inner { gap: 8px; }
            .nav-search input { padding: 8px 14px 8px 38px; font-size: 0.85rem; }
            .nav-search .search-icon { left: 12px; font-size: 0.8rem; }
            .logo { font-size: 1.1rem; }
            .logo i { font-size: 1.2rem; }
            .article-hero h1 { font-size: 1.3rem; }
            .article-hero .meta { font-size: 0.8rem; gap: 8px 16px; }
            .article-body { padding: 20px 16px; }
            .article-body .content { font-size: 0.95rem; }
            .sidebar-card { padding: 20px; }
            .related-section .section-title h2 { font-size: 1.4rem; }
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mb-0 { margin-bottom: 0; }
        .mt-2 { margin-top: 20px; }