:root{--primary-color: #2c3e50;--primary-light: #34495e;--primary-lighter: #7f8c8d;--secondary-color: #3498db;--secondary-light: #5dade2;--secondary-lighter: #85c1e9;--success-color: #27ae60;--warning-color: #f39c12;--error-color: #e74c3c;--info-color: #17a2b8;--text-primary: #2c3e50;--text-secondary: #7f8c8d;--text-disabled: #bdc3c7;--border-color: #e9ecef;--background-color: #f8f9fa;--white: #ffffff;--gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);--gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);--gradient-card: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);--gradient-header: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--font-family-primary: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;--font-family-mono: "Fira Code", "Monaco", "Consolas", monospace;--font-size-xs: 12px;--font-size-sm: 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rgba(255,255,255,.05)}.menu-item:hover{background-color:#34495e}.menu-item.active{background-color:#3498db}.main-container{flex:1;display:flex;flex-direction:column}.main-content{flex:1;background-color:#f5f7fa;padding:20px;overflow-y:auto}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:#e9ecef;border-radius:3px}::-webkit-scrollbar-thumb{background:#7f8c8d;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#34495e}