/* 全局重置：仅重置盒模型，不修改背景等全局样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        /* 全局包裹层 - 改为纯白色，彻底消除渐变背景 */
        .global-wrapper {
            max-width: 100%;
            overflow: hidden;
            margin: 0 auto;
            padding: 20px;
            background: #ffffff; /* 关键修改：渐变→纯白色 */
        }

        /* 恢复body默认样式，确保全局背景纯白 */
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #2c3e50;
            background: #ffffff;
        }

        .article-wrapper {
            max-width: 900px;
            margin: 0 auto;
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }

        .article-meta {
            font-size: 0.95em;
            opacity: 0.95;
            margin-top: 20px;
        }

        .article-content {
            padding: 50px 40px;
        }

        .article-content h2 {
            font-size: 2em;
            color: #667eea;
            margin-top: 50px;
            margin-bottom: 25px;
            border-left: 5px solid #667eea;
            padding-left: 15px;
        }

        .article-content h3 {
            font-size: 1.5em;
            color: #764ba2;
            margin-top: 35px;
            margin-bottom: 15px;
        }

        .article-content p {
            margin-bottom: 18px;
            text-align: justify;
            font-size: 1.05em;
            color: #34495e;
        }

        .article-content ul, .article-content ol {
            margin: 20px 0 20px 30px;
            font-size: 1.05em;
        }

        .article-content li {
            margin-bottom: 12px;
            color: #34495e;
            line-height: 1.8;
        }

        .article-content strong {
            color: #667eea;
            font-weight: 600;
        }

        .article-content em {
            color: #764ba2;
            font-style: italic;
        }

        .image-container {
            margin: 35px 0;
            text-align: center;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .image-container img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
        }

        .image-caption {
            background: #f8f9fa;
            padding: 15px;
            font-size: 0.95em;
            color: #7f8c8d;
            font-style: italic;
            border-top: 2px solid #ecf0f1;
        }

        .comparison-table {
            width: 100%;
            margin: 30px 0;
            border-collapse: collapse;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            overflow: hidden;
        }

        .comparison-table thead {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }

        .comparison-table th {
            padding: 18px;
            text-align: left;
            font-weight: 600;
            border: none;
        }

        .comparison-table td {
            padding: 15px 18px;
            border-bottom: 1px solid #ecf0f1;
            color: #34495e;
        }

        .comparison-table tbody tr:hover {
            background-color: #f8f9fa;
            transition: background-color 0.3s ease;
        }

        .comparison-table tbody tr:last-child td {
            border-bottom: none;
        }

        blockquote {
            border-left: 5px solid #667eea;
            padding: 20px;
            margin: 25px 0;
            background: #f8f9fa;
            border-radius: 8px;
            font-style: italic;
            color: #555;
        }

        .highlight-box {
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
            border-left: 5px solid #667eea;
            padding: 20px;
            margin: 25px 0;
            border-radius: 8px;
        }

        .highlight-box strong {
            color: #667eea;
        }

        .toc {
            background: #f8f9fa;
            border-left: 5px solid #667eea;
            padding: 25px;
            margin: 30px 0;
            border-radius: 8px;
        }

        .toc h3 {
            margin-top: 0;
            color: #667eea;
        }

        .toc ul {
            list-style: none;
            margin: 15px 0 0 0;
        }

        .toc li {
            margin-bottom: 8px;
        }

        .toc a {
            color: #667eea;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .toc a:hover {
            color: #764ba2;
            text-decoration: underline;
        }

        .intro-text {
            font-size: 1.15em;
            color: #555;
            line-height: 1.9;
            margin-bottom: 30px;
            padding: 20px;
            background: #f8f9fa;
            border-radius: 8px;
            border-left: 5px solid #667eea;
        }

        .section-divider {
            height: 2px;
            background: linear-gradient(90deg, transparent, #667eea, transparent);
            margin: 40px 0;
        }

        /* 移动端样式 */
        @media (max-width: 768px) {
            .article-content {
                padding: 30px 20px;
            }

            .article-content h2 {
                font-size: 1.6em;
            }

            .article-content h3 {
                font-size: 1.2em;
            }

            .comparison-table {
                font-size: 0.9em;
            }

            .comparison-table th,
            .comparison-table td {
                padding: 10px;
            }
        }

        a {
            color: #667eea;
            text-decoration: none;
        }

        a:hover {
            text-decoration: underline;
            color: #764ba2;
        }