* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.7;
            color: #333;
            background: #f8f9fa;
            padding: 20px;
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
            background: white;
            padding: 40px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
            border-radius: 8px;
        }

        h1 {
            font-size: 2.2em;
            color: #1a1a1a;
            margin-bottom: 20px;
            line-height: 1.3;
            border-bottom: 3px solid #0066cc;
            padding-bottom: 15px;
        }

        h2 {
            font-size: 1.8em;
            color: #2c3e50;
            margin-top: 40px;
            margin-bottom: 20px;
            padding-left: 10px;
            border-left: 4px solid #0066cc;
        }

        h3 {
            font-size: 1.4em;
            color: #34495e;
            margin-top: 30px;
            margin-bottom: 15px;
        }

        p {
            margin-bottom: 15px;
            text-align: justify;
        }

        .key-takeaways {
            background: #e3f2fd;
            border-left: 4px solid #2196f3;
            padding: 20px;
            margin: 30px 0;
            border-radius: 4px;
        }

        .key-takeaways strong {
            color: #1565c0;
        }

        ul, ol {
            margin-left: 30px;
            margin-bottom: 20px;
        }

        li {
            margin-bottom: 10px;
        }

        /* ======= 优化后的高对比度表格样式 ======= */
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 25px 0;
            font-size: 0.95em;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }

        thead tr {
            background-color: #1a365d; /* 高对比度深海军蓝 */
            color: #ffffff;            /* 纯白文字 */
            text-align: left;
        }

        th, td {
            padding: 12px 15px;
            border: 1px solid #ddd;
        }

        th {
            font-weight: 700;          /* 明确加粗表头 */
            letter-spacing: 0.5px;
        }

        tbody tr:nth-child(even) {
            background-color: #f8f9fa;
        }

        tbody tr:hover {
            background-color: #e9ecef;
        }
        /* ======================================= */

        .warning-box {
            background: #fff3cd;
            border-left: 4px solid #ffc107;
            padding: 15px;
            margin: 20px 0;
            border-radius: 4px;
        }

        .warning-box strong {
            color: #856404;
        }

        .info-box {
            background: #d1ecf1;
            border-left: 4px solid #17a2b8;
            padding: 15px;
            margin: 20px 0;
            border-radius: 4px;
        }

        .code-block {
            background: #f4f4f4;
            border: 1px solid #ddd;
            border-radius: 4px;
            padding: 15px;
            margin: 20px 0;
            font-family: 'Courier New', monospace;
            overflow-x: auto;
            white-space: pre;
        }

        /* ======= 纯 CSS 智能自适应决策树样式 ======= */
        .decision-tree {
            margin: 25px 0;
            padding: 20px;
            background-color: #fdfdfd;
            border: 1px solid #e2e8f0;
            border-radius: 8px;
            font-size: 0.95em;
            box-shadow: inset 0 1px 3px rgba(0,0,0,0.02);
        }
        .tree-node {
            margin-bottom: 20px;
        }
        .tree-node:last-child {
            margin-bottom: 0;
        }
        .tree-question {
            font-weight: 600;
            color: #1e293b;
            background-color: #f1f5f9;
            padding: 8px 14px;
            border-radius: 4px;
            display: inline-block;
            border-left: 3px solid #0066cc;
            margin-bottom: 12px;
        }
        .tree-branches {
            padding-left: 20px;
            border-left: 2px dashed #cbd5e1;
            margin-left: 15px;
        }
        .tree-branch {
            position: relative;
            margin-bottom: 12px;
            padding-left: 15px;
            line-height: 1.5;
        }
        .tree-branch:last-child {
            margin-bottom: 0;
        }
        .tree-branch::before {
            content: "";
            position: absolute;
            left: 0;
            top: 10px;
            width: 10px;
            border-top: 2px dashed #cbd5e1;
        }
        .branch-tag {
            font-weight: 700;
            color: #0284c7;
            margin-right: 5px;
        }
        .branch-target {
            color: #334155;
        }
        .branch-target strong {
            color: #0369a1;
            background-color: #e0f2fe;
            padding: 2px 6px;
            border-radius: 3px;
            font-weight: 600;
        }
        /* ======================================================== */

        .image-placeholder {
            padding: 10px 0;
            margin: 15px 0;
            text-align: left;
            color: #ff6600; 
            font-weight: 600;
            font-size: 0.95em;
        }

        .faq-item {
            margin-bottom: 25px;
            padding: 20px;
            background: #f8f9fa;
            border-radius: 6px;
            border-left: 3px solid #28a745;
        }

        .faq-question {
            font-weight: 600;
            color: #2c3e50;
            margin-bottom: 10px;
            font-size: 1.1em;
        }

        .faq-answer {
            color: #555;
        }

        .sources {
            background: #f1f3f5;
            padding: 20px;
            margin-top: 40px;
            border-radius: 6px;
        }

        .sources ol {
            margin-left: 20px;
        }

        .summary-box {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 30px;
            margin: 40px 0;
            border-radius: 8px;
        }

        .summary-box h2 {
            color: white;
            border-left: 4px solid white;
            margin-top: 0;
        }

        .summary-box strong {
            color: #ffd700;
        }

        a {
            color: #0066cc;
            text-decoration: none;
        }

        a:hover {
            text-decoration: underline;
        }

        @media (max-width: 768px) {
            .container {
                padding: 20px;
            }

            h1 {
                font-size: 1.8em;
            }

            h2 {
                font-size: 1.5em;
            }

            table {
                font-size: 0.85em;
            }

            th, td {
                padding: 8px 10px;
            }
        }