* {
            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: #0b1e2e;
            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;
        }

        /* 页面标题 */
        .page-hero {
            text-align: center;
            margin: 48px 0 32px;
        }
        .page-hero h1 {
            font-size: 3rem;
            font-weight: 800;
            background: linear-gradient(135deg, #0b1e2e, #1e4bd2);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.02em;
        }
        .security-badge {
            display: inline-block;
            background: #f1f5f9;
            padding: 6px 20px;
            border-radius: 40px;
            font-weight: 600;
            color: #0f3b6a;
            margin-top: 12px;
            border: 1px solid #cbdbe9;
        }

        /* 风险卡片 — 第一部分 */
        .risk-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin: 40px 0 50px;
        }
        .risk-card {
            background: white;
            border-radius: 36px;
            padding: 28px 22px;
            box-shadow: 0 15px 30px -10px rgba(0,35,70,0.05);
            border: 1px solid #eef2f8;
            transition: all 0.2s;
        }
        .risk-card.green {
            border-top: 6px solid #10b981;
        }
        .risk-card.yellow {
            border-top: 6px solid #fbbf24;
        }
        .risk-card.red {
            border-top: 6px solid #ef4444;
        }
        .risk-header {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 20px;
        }
        .risk-icon {
            font-size: 2.2rem;
        }
        .risk-header h3 {
            font-size: 1.7rem;
            font-weight: 700;
        }
        .risk-desc {
            color: #334e6e;
            margin-bottom: 20px;
            font-size: 1rem;
        }
        .version-tag {
            background: #f1f6fc;
            padding: 8px 16px;
            border-radius: 30px;
            font-weight: 600;
            color: #1e3b63;
            display: inline-block;
            margin-bottom: 16px;
        }
        .download-mini-btn {
            background: transparent;
            border: 2px solid #2563eb;
            color: #2563eb;
            padding: 10px 24px;
            border-radius: 40px;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: 0.15s;
            text-decoration: none;
            display: inline-block;
        }
        .download-mini-btn:hover {
            background: #2563eb;
            color: white;
        }

        /* 第二部分：智能推荐 (交互感) */
        .recommendation-engine {
            background: linear-gradient(112deg, #ffffff 0%, #f3f9ff 100%);
            border-radius: 48px;
            padding: 40px 40px;
            margin: 50px 0;
            border: 1px solid #cddff5;
            box-shadow: 0 25px 40px -18px rgba(0,70,150,0.1);
        }
        .engine-title {
            font-size: 2.2rem;
            font-weight: 750;
            margin-bottom: 28px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .quiz-panel {
            display: flex;
            flex-wrap: wrap;
            gap: 30px 40px;
            margin-bottom: 30px;
        }
        .quiz-question {
            flex: 1;
            min-width: 200px;
        }
        .quiz-question p {
            font-weight: 650;
            margin-bottom: 12px;
            color: #1e3a6b;
        }
        .quiz-options {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .quiz-opt {
            background: white;
            border: 1.5px solid #b9cee8;
            padding: 8px 20px;
            border-radius: 40px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.1s;
            color: #1e3b63;
        }
        .quiz-opt.selected {
            background: #1e3b63;
            border-color: #1e3b63;
            color: white;
        }
        .output-area {
            margin-top: 28px;
            background: #e5effb;
            border-radius: 50px;
            padding: 22px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .rec-text {
            font-size: 1.4rem;
            font-weight: 650;
        }
        .rec-highlight {
            background: #1e3b63;
            color: white;
            padding: 4px 16px;
            border-radius: 40px;
            margin-left: 10px;
        }
        .rec-download-btn {
            background: #1e3b63;
            color: white;
            padding: 14px 34px;
            border-radius: 50px;
            font-weight: 700;
            text-decoration: none;
            border: none;
            cursor: pointer;
            font-size: 1.1rem;
            box-shadow: 0 12px 18px -8px #1e3b6340;
        }

        /* 第三部分：校验机制 */
        .verify-section {
            background: white;
            border-radius: 40px;
            padding: 32px 36px;
            margin: 48px 0 40px;
            border: 1px solid #e2ecf9;
        }
        .verify-title {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 24px;
        }
        .checksum-box {
            background: #f1f7fe;
            border-radius: 24px;
            padding: 18px 24px;
            font-family: 'SF Mono', 'Menlo', monospace;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 15px 30px;
        }
        .checksum-item {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .checksum-label {
            font-weight: 700;
            color: #1e3b63;
        }
        .checksum-value {
            background: #0f1e2f;
            color: #b0d0ff;
            padding: 6px 16px;
            border-radius: 40px;
            font-size: 0.85rem;
            letter-spacing: 0.3px;
        }
        .verify-source {
            margin-top: 28px;
            display: flex;
            gap: 30px;
            flex-wrap: wrap;
        }
        .source-item {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        /* 底部完全一致 */
        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: 768px) {
            .risk-grid {
                grid-template-columns: 1fr;
            }
            .header-flex {
                flex-direction: column;
                gap: 12px;
            }
            .page-hero h1 {
                font-size: 2.2rem;
            }
        }
        button {
            background: none;
            border: none;
            font-family: inherit;
        }