:root {
            --primary-color: #2563eb;
            --text-main: #1f2937;
            --text-secondary: #4b5563;
            --bg-body: #f3f4f6;
            --bg-card: #ffffff;
            --border-color: #e5e7eb;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.6;
            color: var(--text-main);
            background-color: var(--bg-body);
            padding: 20px;
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 30px;
        }

        /* 主文章区域 */
        main {
            background: var(--bg-card);
            padding: 40px;
            border-radius: 12px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        }

        header {
            margin-bottom: 30px;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 20px;
        }

        h1 {
            font-size: 2.25rem;
            font-weight: 800;
            margin-bottom: 10px;
            color: #111827;
        }

        .meta {
            color: var(--text-secondary);
            font-size: 0.9rem;
            display: flex;
            gap: 15px;
        }

        .content p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            color: #374151;
        }

        .content h2 {
            font-size: 1.5rem;
            margin-top: 2rem;
            margin-bottom: 1rem;
            color: #111827;
        }

        .content img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 20px 0;
        }

        blockquote {
            border-left: 4px solid var(--primary-color);
            padding-left: 1rem;
            margin: 1.5rem 0;
            font-style: italic;
            color: var(--text-secondary);
            background-color: #eff6ff;
            padding: 15px;
            border-radius: 0 8px 8px 0;
        }

        /* 侧边栏 - 推荐阅读 */
        aside {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .sidebar-card {
            background: var(--bg-card);
            padding: 20px;
            border-radius: 12px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        }

        .sidebar-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-color);
            display: inline-block;
        }

        .recommend-list {
            list-style: none;
        }

        .recommend-item {
            margin-bottom: 15px;
            padding-bottom: 15px;
            border-bottom: 1px solid var(--border-color);
        }

        .recommend-item:last-child {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }

        .recommend-link {
            text-decoration: none;
            color: var(--text-main);
            font-weight: 600;
            display: block;
            margin-bottom: 5px;
            transition: color 0.2s;
        }

        .recommend-link:hover {
            color: var(--primary-color);
        }

        .recommend-desc {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.4;
        }

        .tag {
            display: inline-block;
            background-color: #dbeafe;
            color: #1e40af;
            font-size: 0.75rem;
            padding: 2px 8px;
            border-radius: 9999px;
            margin-top: 5px;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .container {
                grid-template-columns: 1fr;
            }
            
            main {
                padding: 20px;
            }

            h1 {
                font-size: 1.8rem;
            }
        }