* { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f7fafd;
            color: #0a1e2f;
            line-height: 1.5;
        }
        .container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
        header {
            background: rgba(255,255,255,0.94); backdrop-filter: blur(12px);
            box-shadow: 0 2px 12px rgba(0,0,0,0.02); position: sticky; top: 0; z-index: 50;
            border-bottom: 1px solid #e2eaf2;
        }
        .header-flex {
            display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; padding: 14px 0;
        }
        .logo-area h1 {
            font-size: 1.8rem; font-weight: 750;
            background: linear-gradient(145deg, #0f2b4b, #2563eb);
            background-clip: text; -webkit-background-clip: text; color: transparent;
            letter-spacing: -0.4px;
        }
        .logo-area p { font-size: 0.75rem; color: #54708f; margin-top: 4px; }
        .nav-links { display: flex; gap: 1.8rem; align-items: center; flex-wrap: wrap; }
        .nav-links a {
            text-decoration: none; font-weight: 530; color: #1e2f44; transition: color 0.15s; font-size: 0.95rem;
        }
        .nav-links a:hover, .nav-links a.active { color: #2563eb; }

        /* 诊断Hero */
        .diagnostic-hero {
            text-align: center; margin: 48px 0 32px;
        }
        .diagnostic-hero h1 {
            font-size: 3.2rem; font-weight: 800;
            background: linear-gradient(135deg, #0a1c2f, #1e4bd2);
            background-clip: text; -webkit-background-clip: text; color: transparent;
        }
        .ai-badge {
            background: #dbeafe; color: #1e4bd2; padding: 8px 28px; border-radius: 60px;
            font-weight: 700; display: inline-block; margin: 16px 0 8px;
        }

        /* 症状卡片 */
        .symptom-grid {
            display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; margin: 40px 0;
        }
        .symptom-card {
            background: white; border-radius: 40px; padding: 32px 20px; text-align: center;
            box-shadow: 0 20px 30px -8px rgba(0,35,70,0.06); border: 1px solid #eaf0fa;
            cursor: pointer; transition: all 0.2s;
        }
        .symptom-card.active {
            border: 2px solid #2563eb; box-shadow: 0 20px 30px -8px #2563eb30;
        }
        .symptom-emoji { font-size: 3.2rem; margin-bottom: 16px; }
        .symptom-card h3 { font-size: 1.8rem; font-weight: 700; margin-bottom: 8px; }

        /* 解决路径面板 */
        .solution-panel {
            background: white; border-radius: 48px; padding: 36px 40px; margin: 30px 0 50px;
            border: 1px solid #d4e2f5; display: none;
        }
        .solution-panel.show { display: block; }
        .solution-title { font-size: 2rem; font-weight: 700; margin-bottom: 24px; }
        .solution-steps { list-style: none; }
        .solution-steps li {
            padding: 16px 0; border-bottom: 1px solid #e2ecf9; display: flex; gap: 16px;
        }
        .step-num {
            background: #1e3b63; color: white; width: 32px; height: 32px; border-radius: 20px;
            display: flex; align-items: center; justify-content: center; font-weight: 700;
        }

        /* 分类系统 */
        .category-tabs {
            display: flex; gap: 16px; flex-wrap: wrap; margin: 40px 0 20px;
        }
        .cat-tab {
            background: white; border: 1px solid #d4e2f5; padding: 12px 28px; border-radius: 60px;
            font-weight: 600; cursor: pointer; transition: 0.15s;
        }
        .cat-tab.active {
            background: #2563eb; color: white; border-color: #2563eb;
        }

        /* FAQ精简列表 */
        .faq-compact {
            display: grid; gap: 12px; margin-bottom: 40px;
        }
        .faq-row {
            background: white; border-radius: 28px; padding: 20px 28px; border: 1px solid #eaf0fa;
            cursor: pointer; transition: 0.1s;
        }
        .faq-row:hover { background: #f5faff; }
        .faq-question { font-weight: 700; display: flex; justify-content: space-between; }
        .faq-answer-compact {
            max-height: 0; overflow: hidden; transition: max-height 0.2s; padding: 0 6px;
            color: #3a5e7e;
        }
        .faq-row.open .faq-answer-compact {
            max-height: 200px; padding: 16px 6px 0; border-top: 1px solid #d4e2f5; margin-top: 16px;
        }

        /* 关联推荐 */
        .related-links {
            background: #eef4ff; border-radius: 48px; padding: 32px 40px; margin: 40px 0;
        }
        .related-title { font-size: 1.8rem; font-weight: 700; margin-bottom: 24px; }
        .link-group { display: flex; gap: 20px; flex-wrap: wrap; }
        .link-card {
            background: white; border-radius: 40px; padding: 16px 28px; font-weight: 600;
            text-decoration: none; color: #1e3b63; border: 1px solid #bdd3ff;
        }

        /* 号召下载 */
        .cta-faq {
            background: #0f2b4b; border-radius: 60px; padding: 48px 40px; margin: 60px 0;
            color: white; text-align: center;
        }
        .btn-download-large {
            background: white; color: #0f2b4b; padding: 16px 48px; border-radius: 60px;
            font-weight: 700; font-size: 1.2rem; text-decoration: none; display: inline-block;
            margin-top: 24px; cursor: pointer; border: none;
        }

        footer {
            background: #0f172a; color: #cbd5e1; padding: 40px 0 24px; margin-top: 20px;
            border-top: 1px solid #1e293b;
        }
        .footer-grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 32px; }
        .footer-copyright {
            text-align: center; padding-top: 32px; font-size: 0.85rem; border-top: 1px solid #1e293b;
            margin-top: 24px;
        }
        @media (max-width: 700px) {
            .symptom-grid { grid-template-columns: 1fr; }
            .diagnostic-hero h1 { font-size: 2.2rem; }
        }