* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f8fbfe;
            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;
        }

        .tun-hero {
            text-align: center;
            margin: 48px 0 32px;
        }
        .tun-hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            background: linear-gradient(135deg, #0a1c2f, #1e4bd2);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.02em;
        }
        .control-badge {
            background: #dbeafe;
            color: #1e4bd2;
            padding: 8px 28px;
            border-radius: 60px;
            font-weight: 700;
            display: inline-block;
            margin: 16px 0 8px;
        }

        /* 第一部分：决策问询 */
        .decision-panel {
            background: white;
            border-radius: 48px;
            padding: 44px 40px;
            margin: 40px 0;
            border: 1px solid #d4e2f5;
        }
        .decision-question {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 28px;
        }
        .symptom-grid {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }
        .symptom-card {
            flex: 1;
            min-width: 180px;
            background: #f2f8ff;
            border-radius: 32px;
            padding: 24px 18px;
            text-align: center;
            border: 1px solid #cde0f5;
        }
        .symptom-emoji {
            font-size: 2.8rem;
            margin-bottom: 12px;
        }
        .symptom-card h3 {
            font-size: 1.5rem;
            margin-bottom: 8px;
        }
        .answer-badge {
            margin-top: 30px;
            background: #10b981;
            color: white;
            padding: 18px 30px;
            border-radius: 60px;
            font-weight: 700;
            font-size: 1.4rem;
            display: inline-block;
        }

        /* 第二部分：模式对比 */
        .mode-compare {
            margin: 50px 0;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 30px;
        }
        .mode-grid {
            display: grid;
            grid-template-columns: repeat(3,1fr);
            gap: 20px;
        }
        .mode-card {
            background: white;
            border-radius: 36px;
            padding: 30px 24px;
            border: 1px solid #e2ecf9;
            transition: all 0.2s;
        }
        .mode-card.tun-highlight {
            border: 2px solid #2563eb;
            box-shadow: 0 15px 25px -10px #2563eb30;
        }
        .mode-name {
            font-size: 2rem;
            font-weight: 750;
            margin-bottom: 20px;
        }
        .platform-icons {
            margin: 16px 0;
            font-size: 1.8rem;
        }
        .verge-vs-cfw {
            display: flex;
            justify-content: space-between;
            margin-top: 18px;
            font-size: 0.9rem;
        }

        /* 第三部分：影响说明 */
        .impact-panel {
            background: linear-gradient(145deg, #0a1c2f, #1e3a5f);
            border-radius: 48px;
            padding: 48px 44px;
            margin: 50px 0;
            color: white;
        }
        .impact-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 36px;
        }
        .impact-metrics {
            display: flex;
            gap: 30px;
            flex-wrap: wrap;
        }
        .metric-item {
            flex: 1;
            min-width: 160px;
            background: #1e3b6350;
            backdrop-filter: blur(4px);
            border-radius: 32px;
            padding: 24px;
            border: 1px solid #5f8ec9;
        }
        .metric-value {
            font-size: 2.8rem;
            font-weight: 800;
        }

        .cta-tun {
            text-align: center;
            margin: 60px 0 40px;
        }
        .btn-tun-download {
            background: #0f2b4b;
            color: white;
            padding: 18px 54px;
            border-radius: 60px;
            font-weight: 700;
            font-size: 1.4rem;
            text-decoration: none;
            display: inline-block;
            transition: 0.2s;
            cursor: pointer;
            border: none;
        }

        footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 40px 0 24px;
            margin-top: 40px;
            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: 800px) {
            .mode-grid { grid-template-columns: 1fr; }
            .tun-hero h1 { font-size: 2.2rem; }
        }