:root{--color-primary: #1a56db;--color-primary-light: #3b82f6;--color-primary-dark: #1e3a8a;--color-accent: #0ea5e9;--color-success: #10b981;--color-warning: #f59e0b;--color-danger: #ef4444;--color-info: #6366f1;--color-bg: #f0f4ff;--color-bg-card: #ffffff;--color-border: #e2e8f0;--color-text-primary: #1e293b;--color-text-secondary: #64748b;--color-text-muted: #94a3b8;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .08), 0 2px 4px -1px rgba(0, 0, 0, .04);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -2px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .08), 0 10px 10px -5px rgba(0, 0, 0, .04);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--transition: all .2s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:PingFang SC,Microsoft YaHei,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:14px;color:var(--color-text-primary);background-color:var(--color-bg);-webkit-font-smoothing:antialiased}#app{height:100%}a{color:var(--color-primary);text-decoration:none}a:hover{color:var(--color-primary-light)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:#f1f5f9;border-radius:3px}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}.el-button--primary{--el-button-bg-color: var(--color-primary);--el-button-border-color: var(--color-primary);--el-button-hover-bg-color: var(--color-primary-light);--el-button-hover-border-color: var(--color-primary-light)}.el-menu{border-right:none!important}.page-card{background:var(--color-bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--color-border);padding:24px}.page-title{font-size:20px;font-weight:700;color:var(--color-text-primary);margin-bottom:20px}.tag-admin{background:#fef3c7;color:#d97706}.tag-teacher{background:#dbeafe;color:#1d4ed8}.tag-student{background:#dcfce7;color:#16a34a}@media (min-width: 769px){.el-drawer{display:none!important}}@media (max-width: 768px){.el-dialog{width:94vw!important;max-width:94vw!important;margin:5vh auto!important}.el-pagination .el-pagination__sizes,.el-pagination .el-pagination__jump{display:none!important}.el-col-12{max-width:100%!important;flex:0 0 100%!important}}