:root {
            --pri: #7c3aed;
            --pri-hover: #6d28d9;
            --pri-light: #ede9fe;
            --accent: #10b981;
            --accent-light: #d1fae5;
            --warm: #f59e0b;
            --warm-light: #fef3c7;
            --bg: #faf9f7;
            --surface: #ffffff;
            --text-dark: #1e1b2e;
            --text-mid: #4a4560;
            --text-light: #6b6680;
            --border: #e8e5f0;
            --border-light: #f3f1f7;
            --shadow-sm: 0 1px 3px rgba(30,27,46,0.04);
            --shadow-md: 0 8px 24px rgba(30,27,46,0.06);
            --shadow-lg: 0 20px 48px rgba(30,27,46,0.08);
            --radius-sm: 14px;
            --radius-md: 20px;
            --radius-lg: 28px;
            --radius-xl: 36px;
            --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
        }
        *, *::before, *::after { box-sizing: border-box; }
        body {
            margin: 0; padding: 0; font-family: var(--font-stack);
            background: var(--bg); color: var(--text-dark); line-height: 1.7;
            letter-spacing: 0.01em; -webkit-font-smoothing: antialiased;
        }

        /* 导航栏（与首页一致） */
        .navbar {
            position: fixed; top: 0; left: 0; width: 100%; height: 72px;
            background: rgba(255,255,255,0.82); backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px); border-bottom: 1px solid var(--border);
            z-index: 1000; display: flex; align-items: center;
        }
        .nav-container { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; }
        .nav-logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }
        .nav-logo img { width: 40px; height: 40px; border-radius: 10px; object-fit: cover; box-shadow: var(--shadow-sm); }
        .nav-logo-text { font-size: 22px; font-weight: 800; color: var(--text-dark); letter-spacing: -0.03em; }
        .nav-badge { background: var(--pri-light); color: var(--pri); font-size: 11px; padding: 4px 10px; border-radius: 20px; font-weight: 700; letter-spacing: 0.04em; }
        .nav-links { display: flex; gap: 36px; list-style: none; margin: 0; padding: 0; }
        .nav-links a { text-decoration: none; color: var(--text-mid); font-size: 15px; font-weight: 600; transition: color 0.2s; position: relative; padding: 6px 0; }
        .nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--pri); border-radius: 2px; transition: width 0.25s; }
        .nav-links a:hover, .nav-links a.active { color: var(--pri); }
        .nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
        .nav-mobile-toggle { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; width: 28px; height: 20px; padding: 0; }
        .nav-mobile-toggle span { display: block; height: 3px; background: var(--text-dark); border-radius: 2px; transition: all 0.3s; }

        /* 主视觉 */
        .hero-section { padding: 160px 24px 100px; max-width: 1280px; margin: 0 auto; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 64px; align-items: center; position: relative; }
        .hero-bg-glow { position: absolute; top: -60px; right: -80px; width: 520px; height: 520px; background: radial-gradient(circle, rgba(124,58,237,0.06) 0%, transparent 70%); border-radius: 50%; pointer-events: none; z-index: 0; }
        .hero-left { position: relative; z-index: 1; }
        .hero-tag { display: inline-block; background: var(--surface); color: var(--pri); font-size: 13px; font-weight: 700; padding: 6px 18px; border-radius: 30px; margin-bottom: 24px; border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
        .hero-title { font-size: 46px; font-weight: 900; color: var(--text-dark); line-height: 1.18; margin: 0 0 24px; letter-spacing: -0.04em; }
        .hero-desc { font-size: 15.5px; color: var(--text-mid); margin-bottom: 40px; max-width: 600px; text-align: justify; }
        .hero-buttons { display: flex; gap: 18px; margin-bottom: 28px; flex-wrap: wrap; }
        .btn-primary { background: var(--pri); color: #fff; text-decoration: none; padding: 15px 34px; border-radius: 30px; font-weight: 700; font-size: 15px; box-shadow: 0 8px 22px rgba(124,58,237,0.22); transition: all 0.25s; display: inline-block; border: none; cursor: pointer; }
        .btn-primary:hover { background: var(--pri-hover); transform: translateY(-2px); box-shadow: 0 14px 30px rgba(124,58,237,0.32); }
        .btn-secondary { background: var(--surface); color: var(--text-dark); text-decoration: none; padding: 15px 34px; border-radius: 30px; font-weight: 700; font-size: 15px; border: 1px solid var(--border); transition: all 0.25s; display: inline-block; }
        .btn-secondary:hover { background: #f5f3fa; transform: translateY(-2px); border-color: var(--pri); }
        .hero-mini-stats { display: flex; gap: 18px; flex-wrap: wrap; font-size: 13px; color: var(--text-light); font-weight: 600; }
        .hero-right-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-xl); padding: 44px 38px; box-shadow: var(--shadow-lg); position: relative; overflow: hidden; z-index: 1; }
        .hero-right-card::before { content: ''; position: absolute; top: 0; left: 0; width: 5px; height: 100%; background: linear-gradient(180deg, var(--pri) 0%, #a78bfa 100%); border-radius: 5px 0 0 5px; }
        .stat-item { display: flex; align-items: center; justify-content: space-between; }
        .stat-number { font-size: 38px; font-weight: 900; color: var(--text-dark); letter-spacing: -0.03em; line-height: 1; }
        .stat-label { font-size: 14px; font-weight: 600; color: var(--text-light); text-align: right; line-height: 1.5; }
        .divider { height: 1px; background: var(--border-light); margin: 28px 0; }

        /* 通用区块 */
        .section-container { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
        .section-header { max-width: 780px; margin: 0 auto 56px; text-align: center; }
        .section-header h2 { font-size: 34px; font-weight: 900; color: var(--text-dark); letter-spacing: -0.03em; margin: 0 0 14px; }
        .section-header p { font-size: 15.5px; color: var(--text-light); margin: 0; }

        /* 快速诊断决策树 */
        .diagnostic-section { padding: 100px 24px; background: var(--surface); border-top: 1px solid var(--border); }
        .tree-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .tree-card { background: #faf9fb; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 30px 24px; text-align: center; transition: all 0.3s; position: relative; }
        .tree-card:hover { border-color: var(--pri); box-shadow: var(--shadow-md); }
        .tree-icon { font-size: 36px; margin-bottom: 14px; }
        .tree-card h5 { font-size: 18px; font-weight: 800; margin: 0 0 10px; color: var(--text-dark); }
        .tree-card p { font-size: 14px; color: var(--text-mid); margin: 0; line-height: 1.6; }

        /* 分类 FAQ */
        .faq-section { padding: 100px 24px; background: var(--bg); }
        .faq-category { margin-bottom: 40px; }
        .faq-category h3 { font-size: 24px; font-weight: 800; color: var(--text-dark); margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
        .faq-category h3 .cat-icon { width: 36px; height: 36px; background: var(--pri-light); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 20px; }
        .faq-grid { display: flex; flex-direction: column; gap: 14px; }
        .faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 20px 28px; transition: 0.2s; }
        .faq-item:hover { border-color: var(--pri); box-shadow: var(--shadow-sm); }
        .faq-item summary { font-size: 16px; font-weight: 700; color: var(--text-dark); cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after { content: '+'; font-size: 22px; color: var(--pri); font-weight: 600; transition: transform 0.2s; }
        .faq-item[open] summary::after { content: '−'; transform: rotate(180deg); }
        .faq-item p { margin: 16px 0 0; font-size: 14.5px; color: var(--text-mid); line-height: 1.7; }

        /* 错误代码速查表 */
        .errorcode-section { padding: 100px 24px; background: var(--surface); border-top: 1px solid var(--border); }
        .code-table-wrap { overflow-x: auto; background: #faf9fb; border-radius: var(--radius-lg); border: 1px solid var(--border); }
        .code-table { width: 100%; border-collapse: collapse; min-width: 600px; }
        .code-table th { background: #f1f0f5; text-align: left; padding: 16px 24px; font-weight: 700; color: var(--text-dark); border-bottom: 1px solid var(--border); }
        .code-table td { padding: 14px 24px; border-bottom: 1px solid var(--border-light); color: var(--text-mid); font-size: 14px; }
        .code-table tr:last-child td { border-bottom: none; }
        .badge-fix { color: var(--accent); font-weight: 600; }

        /* 自检清单 */
        .checklist-section { padding: 100px 24px; background: var(--bg); }
        .checklist-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; max-width: 800px; margin: 0 auto; }
        .check-item { display: flex; gap: 12px; align-items: center; background: var(--surface); padding: 18px 20px; border-radius: var(--radius-md); border: 1px solid var(--border); transition: 0.2s; }
        .check-item:hover { border-color: var(--pri); }
        .check-box { width: 24px; height: 24px; border: 2px solid var(--pri); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 14px; color: var(--pri); flex-shrink: 0; }
        .check-text { font-size: 15px; color: var(--text-mid); font-weight: 500; }

        /* 页脚 */
        .footer { background: #120f1a; color: #9b97a8; padding: 70px 24px 36px; font-size: 13.5px; border-top: 1px solid #1e1a2a; }
        .footer-inner { max-width: 1240px; margin: 0 auto; display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 50px; margin-bottom: 50px; }
        .footer-brand h4 { color: #fff; font-size: 19px; font-weight: 800; margin: 0 0 16px; letter-spacing: -0.02em; }
        .footer-brand p { line-height: 1.7; margin: 0; font-size: 13.5px; color: #7a7488; }
        .footer-col h5 { color: #fff; font-size: 15px; font-weight: 700; margin: 0 0 16px; }
        .footer-col ul { list-style: none; padding: 0; margin: 0; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: #9b97a8; text-decoration: none; transition: color 0.18s; font-weight: 500; }
        .footer-col ul li a:hover { color: #fff; }
        .footer-bottom { max-width: 1240px; margin: 0 auto; padding-top: 30px; border-top: 1px solid #1e1a2a; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; color: #6b647a; font-weight: 500; font-size: 12.5px; }

        /* 响应式 */
        @media (max-width: 1100px) {
            .hero-section { grid-template-columns: 1fr; padding-top: 130px; }
            .hero-title { font-size: 36px; }
            .tree-grid { grid-template-columns: 1fr 1fr; }
            .checklist-grid { grid-template-columns: 1fr; }
        }
        @media (max-width: 768px) {
            .navbar { height: 64px; }
            .nav-links { display: none; position: absolute; top: 64px; left: 0; width: 100%; background: rgba(255,255,255,0.96); backdrop-filter: blur(18px); flex-direction: column; gap: 0; border-bottom: 1px solid var(--border); }
            .nav-links.nav-open { display: flex; }
            .nav-links a { padding: 15px 24px; border-bottom: 1px solid var(--border-light); }
            .nav-mobile-toggle { display: flex; }
            .hero-section { padding: 120px 16px 60px; gap: 32px; }
            .hero-title { font-size: 30px; }
            .section-header h2 { font-size: 26px; }
            .tree-grid { grid-template-columns: 1fr; }
        }