/* ========== 左侧：文章详情 ========== */
        .left-box {
            flex:1; min-width:300px;
            background:var(--white);
            border-radius:12px; padding:10px;
            box-shadow:0 5px 20px rgba(0,0,0,0.06);
        }

        /* 文章标题 */
        .article-title {
            font-size:26px;
            color:#333;
            line-height:1.5;
            margin-bottom:15px;
            font-weight:bold;
        }

        /* 文章信息 */
        .article-info {
            font-size:14px;
            color:#999;
            margin-bottom:30px;
            padding-bottom:20px;
            border-bottom:1px dashed #eee;
        }

        /* 文章内容 */
        .article-content {
            font-size:16px;
            line-height:2;
            color:#444;
        }
        .article-content p {
            margin-bottom:20px;
        }
        .article-content img {
            max-width:100%;
            height:auto;
            border-radius:8px;
            margin:10px 0 20px;
            display:block;
        }

        /* 上下篇 */
        .article-page {
            margin-top:40px;
            padding-top:20px;
            border-top:1px dashed #eee;
            font-size:15px;
        }
        .article-page a {
            color:#666;
            text-decoration:none;
            line-height:1.8;
        }
        .article-page a:hover {
            color:var(--tsinghua-purple);
        }

        /* 右侧课堂风采 全局统一 */
        .right-photo-grid {
            display:grid; grid-template-columns:repeat(2,1fr); gap:8px;
        }
        .right-photo-item { border-radius:6px; overflow:hidden; }
        .right-photo-item img {
            width:100%; height:85px; object-fit:cover;
        }
        .right-photo-item p {
            text-align:center; font-size:12px; color:#666; padding:5px 0 0;
        }