:root{--accent: #2a78d6;--accent-hover: #3987e5;--surface-page: #f9f9f7;--surface-card: #fcfcfb;--surface-sidebar: #ffffff;--text-primary: #0b0b0b;--text-secondary: #52514e;--text-muted: #898781;--border: rgba(11, 11, 11, .1);--danger: #c8402c;--danger-bg: #fbeceA;--success: #1f8a4c;--success-bg: #e9f6ee;--warning: #a86a00;--warning-bg: #fdf3e0;--radius-sm: 6px;--radius-md: 10px;--shadow-card: 0 1px 2px rgba(11, 11, 11, .06), 0 1px 8px rgba(11, 11, 11, .04)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;background:var(--surface-page);color:var(--text-primary);-webkit-font-smoothing:antialiased}a{color:inherit}button{font-family:inherit}.auth-loading{min-height:100vh;display:flex;align-items:center;justify-content:center;color:var(--text-muted, #6b7280);font-size:14px}.login-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.login-card{width:100%;max-width:380px;background:var(--surface-card);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-card);padding:36px 32px;text-align:center}.login-card h1{font-size:20px;margin:0 0 6px}.login-card p.subtitle{color:var(--text-secondary);font-size:14px;margin:0 0 28px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:var(--radius-sm);border:1px solid transparent;padding:10px 18px;font-size:14px;font-weight:600;cursor:pointer;transition:background-color .12s ease,border-color .12s ease}.btn-primary{background:var(--accent);color:#fff;width:100%}.btn-primary:hover{background:var(--accent-hover)}.btn-secondary{background:transparent;border-color:var(--border);color:var(--text-primary)}.btn-secondary:hover{border-color:var(--accent);color:var(--accent)}.btn-danger-outline{background:transparent;border-color:var(--border);color:var(--danger)}.btn-danger-outline:hover{border-color:var(--danger);background:var(--danger-bg)}.btn:disabled{opacity:.5;cursor:not-allowed}.login-note{margin-top:20px;font-size:12px;color:var(--text-muted);line-height:1.5}.admin-shell{display:flex;min-height:100vh}.admin-sidebar{width:240px;flex-shrink:0;background:var(--surface-sidebar);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:20px 14px}.admin-sidebar .brand{font-weight:700;font-size:15px;padding:0 10px 20px}.admin-sidebar .brand span{display:block;font-weight:400;font-size:12px;color:var(--text-muted);margin-top:2px}.admin-nav{display:flex;flex-direction:column;gap:2px;flex:1}.admin-nav a{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:var(--radius-sm);text-decoration:none;font-size:14px;color:var(--text-secondary)}.admin-nav a:hover{background:var(--surface-page);color:var(--text-primary)}.admin-nav a.active{background:var(--accent);color:#fff}.admin-main{flex:1;display:flex;flex-direction:column;min-width:0}.admin-topbar{height:60px;flex-shrink:0;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 24px;background:var(--surface-card)}.admin-topbar .user-info{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--text-secondary)}.admin-content{flex:1;padding:28px 32px;max-width:1100px;width:100%}.page-header{margin-bottom:22px}.page-header h1{font-size:22px;margin:0 0 4px}.page-header p{color:var(--text-secondary);font-size:14px;margin:0}.card{background:var(--surface-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:22px;box-shadow:var(--shadow-card);margin-bottom:20px}.card h2{font-size:15px;margin:0 0 14px}.badge{display:inline-flex;align-items:center;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:600}.badge-success{background:var(--success-bg);color:var(--success)}.badge-warning{background:var(--warning-bg);color:var(--warning)}.badge-danger{background:var(--danger-bg);color:var(--danger)}.badge-muted{background:var(--surface-page);color:var(--text-muted)}table.data-table{width:100%;border-collapse:collapse;font-size:13px}table.data-table th{text-align:left;color:var(--text-muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.02em;border-bottom:1px solid var(--border);padding:8px 10px}table.data-table td{border-bottom:1px solid var(--border);padding:9px 10px;vertical-align:top}table.data-table tr:last-child td{border-bottom:none}.dropzone{border:2px dashed var(--border);border-radius:var(--radius-md);padding:36px 20px;text-align:center;color:var(--text-secondary);font-size:14px;cursor:pointer;transition:border-color .12s ease,background-color .12s ease}.dropzone:hover,.dropzone.dragover{border-color:var(--accent);background:#2a78d60a}.dropzone input[type=file]{display:none}.empty-state{color:var(--text-muted);font-size:14px;text-align:center;padding:30px 10px}.actions-row{display:flex;gap:10px;justify-content:flex-end;margin-top:18px}.warning-list{margin:0;padding-left:18px;font-size:13px;color:var(--warning)}.warning-list li{margin-bottom:4px}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px;margin-bottom:20px}.stat-card{background:var(--surface-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px 18px}.stat-card .stat-value{font-size:24px;font-weight:700}.stat-card .stat-label{font-size:12px;color:var(--text-muted);margin-top:2px}.week-tabs{display:flex;align-items:center;gap:8px;margin-bottom:18px;flex-wrap:wrap}.week-tab{border:1px solid var(--border);background:transparent;color:var(--text-secondary);border-radius:var(--radius-sm);padding:7px 16px;font-size:13px;font-weight:600;cursor:pointer}.week-tab:hover{border-color:var(--accent);color:var(--accent)}.week-tab.active{background:var(--accent);border-color:var(--accent);color:#fff}.week-tabs-total{margin-left:auto;font-size:12px;color:var(--text-muted)}.class-filter-row{display:flex;align-items:center;gap:10px;margin-bottom:16px;flex-wrap:wrap}.class-filter-row label{font-size:13px;color:var(--text-secondary);font-weight:600}.class-filter-row select{border:1px solid var(--border);border-radius:var(--radius-sm);padding:7px 10px;font-size:13px;background:var(--surface-card);color:var(--text-primary);min-width:220px}.anchor-form-row{display:flex;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:10px}.form-field{display:flex;flex-direction:column;gap:4px}.form-field label{font-size:12px;color:var(--text-secondary);font-weight:600}.form-field input,.form-field select{border:1px solid var(--border);border-radius:var(--radius-sm);padding:7px 10px;font-size:13px;background:var(--surface-card);color:var(--text-primary)}.schedule-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.schedule-day-column{min-width:0}.schedule-day-header{font-size:13px;font-weight:700;padding:6px 4px;border-bottom:2px solid var(--border);margin-bottom:8px}.schedule-day-header span{font-weight:400;color:var(--text-muted)}.schedule-slot{background:var(--surface-page);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;margin-bottom:8px;font-size:12px}.schedule-slot-time{font-weight:700;color:var(--accent);margin-bottom:2px}.schedule-slot-subject{font-weight:600;margin-bottom:2px}.schedule-slot-meta{color:var(--text-muted);line-height:1.4}@media(max-width:900px){.schedule-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}