/* ========== 全局重置 & 与首页完全统一的风格 ========== */
        *{margin:0;padding:0;box-sizing:border-box;}
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f9fafc;
            color: #0b1e33;
            line-height: 1.5;
            scroll-behavior: smooth;
        }
        .container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
        
        /* 头部 — 毛玻璃现代 (同首页) */
        header {
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(12px);
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
            position: sticky;
            top: 0;
            z-index: 50;
            border-bottom: 1px solid #eef2f6;
        }
        .header-flex {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 14px 0;
        }
        .logo-area h1 {
            font-size: 1.9rem;
            font-weight: 750;
            background: linear-gradient(145deg, #0f2b4b, #2563eb);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
        }
        .logo-area p {
            font-size: 0.75rem;
            color: #54708f;
            margin-top: 4px;
            font-weight: 400;
            letter-spacing: 0.3px;
        }
        .nav-links {
            display: flex;
            gap: 1.4rem;
            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, #0b1e2e, #1e4bd2);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.02em;
        }
        .ai-badge {
            background: #dbeafe;
            color: #1e4bd2;
            padding: 8px 28px;
            border-radius: 60px;
            font-weight: 700;
            display: inline-block;
            margin: 16px 0 8px;
            border: 1px solid #bdd3ff;
        }

        /* 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:hover { transform: translateY(-4px); }
        .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; }
        .symptom-card p { color: #365573; }

        /* 解决路径面板 */
        .solution-panel {
            background: white;
            border-radius: 48px;
            padding: 36px 40px;
            margin: 30px 0 50px;
            border: 1px solid #d9e6ff;
            box-shadow: 0 15px 30px -10px rgba(0,67,156,0.06);
            display: none;
        }
        .solution-panel.show { display: block; }
        .solution-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .solution-steps { list-style: none; }
        .solution-steps li {
            padding: 16px 0;
            border-bottom: 1px solid #e2ecf9;
            display: flex;
            gap: 16px;
            align-items: flex-start;
        }
        .step-num {
            background: #1e3b63;
            color: white;
            width: 32px;
            height: 32px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            flex-shrink: 0;
        }

        /* 分类系统标签 */
        .category-tabs {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            margin: 40px 0 20px;
        }
        .cat-tab {
            background: white;
            border: 1.5px solid #d4e2f5;
            padding: 12px 28px;
            border-radius: 60px;
            font-weight: 600;
            cursor: pointer;
            transition: 0.15s;
            color: #1e3b63;
        }
        .cat-tab.active {
            background: #2563eb;
            color: white;
            border-color: #2563eb;
        }
        .cat-tab:hover { background: #e0edff; }

        /* FAQ精简列表 (30+问题) */
        .faq-compact {
            display: grid;
            gap: 12px;
            margin: 30px 0 50px;
        }
        .faq-row {
            background: white;
            border-radius: 28px;
            padding: 20px 28px;
            border: 1px solid #eaf0fa;
            cursor: pointer;
            transition: 0.15s;
        }
        .faq-row:hover { background: #f5faff; border-color: #bdd3ff; }
        .faq-question {
            font-weight: 700;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: #0f2b4b;
        }
        .faq-question span { font-size: 1.2rem; color: #2563eb; transition: transform 0.2s; }
        .faq-row.open .faq-question span { transform: rotate(180deg); }
        .faq-answer-compact {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            padding: 0 6px;
            color: #3a5e7e;
        }
        .faq-row.open .faq-answer-compact {
            max-height: 300px;
            padding: 18px 6px 0;
            border-top: 1px dashed #cbdbe9;
            margin-top: 16px;
        }

        /* 关联推荐 */
        .related-links {
            background: #eef4ff;
            border-radius: 48px;
            padding: 32px 40px;
            margin: 40px 0 30px;
            border: 1px solid #d9e6ff;
        }
        .related-title {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 24px;
            color: #0f2b4b;
        }
        .link-group {
            display: flex;
            gap: 18px;
            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;
            transition: 0.15s;
        }
        .link-card:hover {
            background: #2563eb;
            color: white;
            border-color: #2563eb;
        }

        /* 号召下载区域 (返回下载页) */
        .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: 1.3rem;
            text-decoration: none;
            display: inline-block;
            margin-top: 24px;
            transition: 0.2s;
            box-shadow: 0 16px 28px -8px #0f2b4b60;
        }
        .btn-download-large:hover { background: #e0edff; transform: scale(1.02); }

        footer {
            background: #0b1a2a;
            color: #b0c7de;
            padding: 40px 0 24px;
            margin-top: 20px;
            border-top: 1px solid #1e3347;
        }
        .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 #1e3347;
            margin-top: 24px;
        }

        @media (max-width: 700px) {
            .symptom-grid { grid-template-columns: 1fr; }
            .diagnostic-hero h1 { font-size: 2.2rem; }
            .header-flex { flex-direction: column; gap: 12px; }
            .nav-links { justify-content: center; }
        }