.biref-container { background: #fff; border-radius: 12px; padding: 40px; box-shadow: 0 4px 20px rgba(0,0,0,0.05); }
        .biref-header { text-align: center; margin-bottom: 40px; }
        .biref-tag { background: #e8f5e9; color: #2e7d32; padding: 4px 12px; border-radius: 4px; font-size: 14px; font-weight: bold; }
        .biref-title { font-size: 28px; color: #2c3e50; margin: 15px 0; }
        .biref-desc { color: #7f8c8d; line-height: 1.6; max-width: 800px; margin: 0 auto; }
        
        /* 对比案例样式 */
        .case-section { margin: 50px 0; }
        .case-grid { display: grid; grid-template-columns: 1fr; gap: 30px; }
        .case-item { display: flex; flex-direction: column; align-items: center; background: #f9f9f9; padding: 20px; border-radius: 8px; }
        .case-images { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
        .case-images img { width: 45%; max-width: 300px; border-radius: 4px; border: 1px solid #eee; background-image: 
            linear-gradient(45deg, #eee 25%, transparent 25%, transparent 75%, #eee 75%, #eee 100%), 
            linear-gradient(45deg, #eee 25%, white 25%, white 75%, #eee 75%, #eee 100%);
            background-size: 20px 20px; background-position: 0 0, 10px 10px; }
        .case-label { margin-top: 10px; font-size: 14px; color: #95a5a6; }

        /* 下载区域 */
        .download-box { background: #f1f3f4; border-left: 5px solid #3498db; padding: 30px; margin-top: 40px; border-radius: 0 8px 8px 0; }
        .download-title { font-size: 20px; font-weight: bold; margin-bottom: 20px; display: flex; align-items: center; }
        .download-card-group { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
        .download-card { background: white; padding: 20px; border-radius: 8px; border: 1px solid #e0e0e0; transition: transform 0.2s; }
        .download-card:hover { transform: translateY(-3px); box-shadow: 0 5px 15px rgba(0,0,0,0.1); }
        .download-btn { display: inline-block; background: #27ae60; color: white; padding: 10px 20px; border-radius: 5px; text-decoration: none; margin-top: 15px; font-weight: bold; }
        .download-btn:hover { background: #219150; }
        .pwd-tag { background: #eee; padding: 2px 6px; border-radius: 3px; font-family: monospace; }
        
        .privacy-notice { margin-top: 30px; font-size: 13px; color: #e67e22; border-top: 1px dashed #ddd; padding-top: 20px; }