:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}#root{min-height:100vh}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:#eef3f8}.login-card{width:min(100%,400px);border-radius:8px}:root{color:#1f2937;background:#f5f7fb}body{background:#f5f7fb}.admin-shell{min-height:100vh;background:#f5f7fb}.admin-header{height:auto;min-height:64px;padding:12px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px;background:#263445}.admin-title.ant-typography{margin:0;color:#fff}.admin-content{width:min(1180px,100%);margin:0 auto;padding:24px}.center-state{min-height:320px;display:flex;align-items:center;justify-content:center}.empty-panel,.overview-stats,.class-summary,.class-management-panel,.teacher-list-panel,.teacher-detail-panel,.tabs-panel,.toolbar{background:#fff;border:1px solid #e5e7eb;border-radius:8px}.empty-panel{padding:48px 24px}.overview-stats{padding:16px 24px;margin-bottom:16px}.class-summary{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 24px;margin-bottom:16px}.class-management-panel,.teacher-list-panel,.teacher-detail-panel{padding:16px 20px 20px;margin-bottom:16px}.teacher-detail-panel .ant-typography,.class-meta{margin-bottom:12px}.teacher-table-wrapper{overflow-x:auto}.teacher-table{width:100%;border-collapse:collapse;font-size:14px}.teacher-table th,.teacher-table td{padding:10px 12px;text-align:left;border-bottom:1px solid #f0f0f0;white-space:nowrap}.teacher-table th{font-weight:500;color:#666;background:#fafafa}.teacher-table tbody tr{cursor:pointer;transition:background .15s}.teacher-table tbody tr:hover{background:#f5f7fb}.teacher-table tbody tr.teacher-row-selected{background:#e6f4ff}.status-active{display:inline-block;padding:1px 8px;border-radius:4px;font-size:12px;color:#52c41a;background:#f6ffed;border:1px solid #b7eb8f}.status-disabled{display:inline-block;padding:1px 8px;border-radius:4px;font-size:12px;color:#fa8c16;background:#fff7e6;border:1px solid #ffd591}.class-summary h3.ant-typography{margin:0 0 6px}.invite-code{font-size:18px}.head-teacher-label{font-size:14px;white-space:nowrap}.class-select{min-width:180px}.tabs-panel{padding:16px 20px 20px}.table-toolbar{margin-bottom:16px}.toolbar{padding:16px;margin-bottom:16px}.filter-select{width:140px}.action-input{width:180px}.diff-code{display:inline-block;max-width:360px;padding:2px 6px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;border-radius:4px;background:#f3f4f6;color:#374151;font-size:12px}@media (max-width: 720px){.admin-header{padding:12px 16px;align-items:flex-start;flex-direction:column}.admin-content{padding:16px}.class-summary{padding:16px;align-items:flex-start;flex-direction:column}.tabs-panel{padding:12px}.filter-select,.class-select,.action-input{width:min(100%,220px)}}