:root{--bg-primary: #f5f5f7;--bg-secondary: #ffffff;--bg-tertiary: #e8e8ed;--bg-hover: rgba(0, 0, 0, .04);--bg-active: rgba(0, 0, 0, .06);--text-primary: #1d1d1f;--text-secondary: #6e6e73;--text-tertiary: #86868b;--accent: #007aff;--accent-hover: #0066d6;--accent-light: rgba(0, 122, 255, .1);--destructive: #ff3b30;--destructive-hover: #d63029;--success: #34c759;--warning: #ff9500;--border: rgba(0, 0, 0, .1);--border-strong: rgba(0, 0, 0, .18);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .08);--shadow-md: 0 4px 12px rgba(0, 0, 0, .1);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .14);--shadow-xl: 0 20px 60px rgba(0, 0, 0, .2);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;--sidebar-width: 260px;--header-height: 52px;--mobile-header-height: 52px;--mobile-tab-height: 56px;--transition: .2s ease;--safe-bottom: env(safe-area-inset-bottom, 0px);--safe-top: env(safe-area-inset-top, 0px);--safe-left: env(safe-area-inset-left, 0px);--safe-right: env(safe-area-inset-right, 0px)}*{margin:0;padding:0;box-sizing:border-box}html{height:100%}body,#root{height:100%;width:100%;overflow:hidden}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:15px;line-height:1.47}.app-layout{display:flex;height:100%;width:100%;overflow:hidden}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:#f6f6f8d9;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-right:1px solid var(--border);display:flex;flex-direction:column;height:100%;z-index:100;transition:transform .3s ease}.sidebar-header{padding:20px 20px 12px;display:flex;align-items:center;gap:10px}.sidebar-header .app-icon{width:36px;height:36px;border-radius:8px;background:linear-gradient(135deg,#007aff,#5856d6);display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:700;flex-shrink:0}.sidebar-header h1{font-size:17px;font-weight:700;letter-spacing:-.2px;color:var(--text-primary)}.sidebar-nav{flex:1;padding:8px 12px;overflow-y:auto}.sidebar-nav a{display:flex;align-items:center;gap:10px;padding:8px 12px;border-radius:var(--radius-sm);color:var(--text-secondary);text-decoration:none;font-size:14px;font-weight:500;transition:all var(--transition);margin-bottom:2px}.sidebar-nav a:hover{background:var(--bg-hover);color:var(--text-primary)}.sidebar-nav a.active{background:var(--accent-light);color:var(--accent)}.sidebar-nav a .nav-icon{font-size:18px;width:24px;text-align:center;flex-shrink:0}.sidebar-footer{padding:12px 16px;border-top:1px solid var(--border);font-size:12px;color:var(--text-tertiary);text-align:center}.school-picker{padding:0 12px 4px}.school-picker-select{width:100%;padding:6px 10px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-primary);color:var(--text-primary);font-size:13px;font-weight:500;cursor:pointer;outline:none;transition:border-color var(--transition)}.school-picker-select:focus{border-color:var(--accent)}.school-name-label{padding:4px 20px 8px;font-size:12px;font-weight:600;color:var(--text-tertiary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.school-list{display:flex;flex-direction:column;gap:4px}.school-list-item{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border-radius:var(--radius-sm);background:var(--bg-primary);border:1px solid var(--border)}.school-list-name{font-weight:600;font-size:14px;color:var(--text-primary)}.main-content{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}.page-header{padding:20px 28px 16px;background:var(--bg-secondary);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;flex-shrink:0;z-index:50}.page-header h2{font-size:22px;font-weight:700;letter-spacing:-.3px}.page-header-actions{display:flex;gap:8px;flex-wrap:wrap}.page-body{flex:1;overflow-y:auto;padding:24px 28px;-webkit-overflow-scrolling:touch}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 16px;border:none;border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:14px;font-weight:500;cursor:pointer;transition:all var(--transition);white-space:nowrap;text-decoration:none}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary)}.btn-secondary:hover{background:#d8d8de}.btn-destructive{background:var(--destructive);color:#fff}.btn-destructive:hover{background:var(--destructive-hover)}.btn-ghost{background:transparent;color:var(--accent)}.btn-ghost:hover{background:var(--accent-light)}.btn-sm{padding:5px 10px;font-size:13px}.btn-icon{padding:6px;min-width:32px;min-height:32px}.card{background:var(--bg-secondary);border-radius:var(--radius-lg);border:1px solid var(--border);box-shadow:var(--shadow-sm);overflow:hidden}.card-header{padding:16px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:12px}.card-header h3{font-size:16px;font-weight:600;letter-spacing:-.1px}.card-body{padding:20px}.form-group{margin-bottom:16px}.form-group 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14px;font-size:12px;font-weight:600;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.5px;border-bottom:1px solid var(--border);white-space:nowrap;position:sticky;top:0;background:var(--bg-secondary);z-index:5}.data-table td{padding:10px 14px;border-bottom:1px solid var(--border);color:var(--text-primary);white-space:nowrap}.data-table tbody tr{transition:background var(--transition)}.data-table tbody tr:hover{background:var(--bg-hover)}.data-table .actions-cell{display:flex;gap:4px}.modal-overlay{position:fixed;inset:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px;animation:fadeIn .2s ease}.modal{background:var(--bg-secondary);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);width:100%;max-width:560px;max-height:90vh;display:flex;flex-direction:column;animation:modalSlideUp .3s ease}.modal-wide{max-width:680px}.modal-header{padding:20px 24px 12px;display:flex;align-items:center;justify-content:space-between}.modal-header h3{font-size:18px;font-weight:700;letter-spacing:-.2px}.modal-close{width:30px;height:30px;border-radius:50%;background:var(--bg-tertiary);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:16px;color:var(--text-secondary);transition:all var(--transition)}.modal-close:hover{background:#d0d0d5}.modal-body{padding:12px 24px 24px;overflow-y:auto;-webkit-overflow-scrolling:touch}.modal-footer{padding:16px 24px;border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:8px}.badge{display:inline-flex;align-items:center;padding:2px 8px;border-radius:20px;font-size:12px;font-weight:600;letter-spacing:.2px}.badge-blue{background:#007aff1f;color:#007aff}.badge-green{background:#34c7591f;color:#34c759}.badge-orange{background:#ff95001f;color:#ff9500}.badge-red{background:#ff3b301f;color:#ff3b30}.badge-purple{background:#5856d61f;color:#5856d6}.badge-gray{background:#8e8e931f;color:#8e8e93}.search-bar{position:relative}.search-bar input{padding-left:36px}.search-bar .search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-tertiary);font-size:14px;pointer-events:none}.empty-state{text-align:center;padding:60px 20px;color:var(--text-tertiary)}.empty-state .empty-icon{font-size:48px;margin-bottom:16px;opacity:.5}.empty-state h3{font-size:18px;font-weight:600;color:var(--text-secondary);margin-bottom:8px}.empty-state p{font-size:14px;max-width:300px;margin:0 auto}.skill-dots{display:flex;gap:3px}.skill-dot{width:10px;height:10px;border-radius:50%;background:var(--bg-tertiary)}.skill-dot.filled{background:var(--accent)}.chip-list{display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}.chip{display:inline-flex;align-items:center;gap:4px;padding:4px 10px;background:var(--accent-light);color:var(--accent);border-radius:20px;font-size:13px;font-weight:500}.chip-remove{background:none;border:none;color:var(--accent);cursor:pointer;font-size:14px;padding:0;line-height:1;margin-left:2px;display:flex;align-items:center}.drop-zone{border:2px dashed var(--border-strong);border-radius:var(--radius-lg);padding:40px 20px;text-align:center;transition:all var(--transition);cursor:pointer}.drop-zone:hover,.drop-zone.drag-over{border-color:var(--accent);background:var(--accent-light)}.drop-zone .drop-icon{font-size:40px;margin-bottom:12px;opacity:.5}.drop-zone p{font-size:15px;color:var(--text-secondary);margin-bottom:4px}.drop-zone 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scale(1)}}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#00000026;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#00000040}.toast-container{position:fixed;top:20px;right:20px;z-index:10000;display:flex;flex-direction:column;gap:8px;pointer-events:none}.toast{display:flex;align-items:center;gap:10px;padding:12px 18px;border-radius:var(--radius-lg);font-size:14px;font-weight:500;color:#fff;box-shadow:0 8px 24px #0000002e;animation:toastIn .3s cubic-bezier(.21,1.02,.73,1) forwards;pointer-events:auto;max-width:360px}.toast-success{background:#34c759}.toast-error{background:#ff3b30}.toast-icon{font-size:16px;font-weight:700;flex-shrink:0;width:22px;height:22px;display:flex;align-items:center;justify-content:center;background:#ffffff40;border-radius:50%}@keyframes toastIn{0%{opacity:0;transform:translate(40px) scale(.95)}to{opacity:1;transform:translate(0) scale(1)}}.setup-guide{display:flex;flex-direction:column;gap:2px}.setup-step{display:flex;align-items:center;gap:16px;padding:16px;border-radius:var(--radius);cursor:pointer;transition:background var(--transition)}.setup-step:hover{background:var(--bg-hover)}.setup-step-number{width:36px;height:36px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;flex-shrink:0}.setup-step h4{font-size:14px;font-weight:600;margin-bottom:2px}.setup-step p{font-size:13px;color:var(--text-tertiary);margin:0}.class-structure{display:flex;flex-direction:column;gap:4px}.grade-section{border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;margin-bottom:8px}.grade-section:last-child{margin-bottom:0}.grade-section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.grade-section-title{display:flex;align-items:center;gap:8px}.grade-section-title h4{font-size:15px;font-weight:600;margin:0}.grade-section-actions{display:flex;gap:4px;align-items:center}.grade-section-unassigned{border-style:dashed;border-color:var(--border-strong)}.homeroom-chips{display:flex;flex-wrap:wrap;gap:8px}.homeroom-chip{display:flex;align-items:center;gap:10px;padding:8px 12px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);transition:border-color var(--transition),box-shadow var(--transition)}.homeroom-chip:hover{border-color:var(--border-strong);box-shadow:0 1px 4px #0000000d}.homeroom-chip-info{display:flex;flex-direction:column;min-width:0}.homeroom-chip-name{font-size:14px;font-weight:600;color:var(--text-primary);white-space:nowrap}.homeroom-chip-count{font-size:12px;color:var(--text-tertiary)}.homeroom-chip-actions{display:flex;gap:2px;margin-left:4px}.homeroom-chip-actions button{background:none;border:none;cursor:pointer;padding:2px 6px;border-radius:var(--radius-sm);font-size:13px;color:var(--text-tertiary);transition:all var(--transition)}.homeroom-chip-actions button:hover{background:var(--bg-hover);color:var(--text-primary)}.homeroom-chip-actions button:last-child:hover{color:var(--destructive)}.homeroom-chip-add{border:2px dashed var(--border-strong)!important;background:transparent!important;cursor:pointer;font-size:13px;font-weight:500;color:var(--text-tertiary);padding:8px 14px!important}.homeroom-chip-add:hover{border-color:var(--accent)!important;color:var(--accent)}.check-pill-group{display:flex;flex-wrap:wrap;gap:8px}.check-pill{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border:1.5px solid var(--border-strong);border-radius:20px;background:var(--bg-primary);font-size:13px;font-weight:500;color:var(--text-secondary);cursor:pointer;transition:all .15s ease;user-select:none;-webkit-user-select:none}.check-pill:hover{border-color:var(--accent);color:var(--accent)}.check-pill.active{background:#007aff1a;border-color:var(--accent);color:var(--accent);font-weight:600}.check-pill-check{font-size:11px;font-weight:700}.form-section{margin-top:20px;margin-bottom:16px}.form-section:first-child{margin-top:0}.form-section-title{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;color:var(--text-tertiary);padding-bottom:8px;border-bottom:1px solid var(--border);margin-bottom:14px}.form-hint{font-size:12px;color:var(--text-tertiary);margin-top:4px;font-style:italic}.skill-rating{display:flex;gap:6px}.skill-rating-dot{width:36px;height:36px;border-radius:50%;border:2px solid var(--border-strong);background:var(--bg-secondary);color:var(--text-tertiary);font-size:14px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s ease;padding:0}.skill-rating-dot:hover{border-color:var(--accent);color:var(--accent)}.skill-rating-dot.active{background:var(--accent);border-color:var(--accent);color:#fff}.flag-toggles{display:flex;flex-wrap:wrap;gap:8px}.chip-red{background:#ff3b301a!important;color:var(--destructive)!important;border-color:#ff3b3033!important}.btn-destructive{background:var(--destructive);color:#fff;border:none}.btn-destructive:hover{background:#e0342d}.section-card{margin-bottom:16px}.danger-zone-card{border:1.5px solid rgba(255,59,48,.25);margin-top:32px}.danger-zone-card .card-header h3{color:var(--destructive)}.badge-gray{background:var(--bg-secondary);color:var(--text-secondary)}.badge-blue{background:#007aff1a;color:var(--accent)}.badge-orange{background:#ff95001f;color:#e68600}.badge-red{background:#ff3b301a;color:var(--destructive)}.badge-green{background:#34c7591f;color:var(--success)}.badge-purple{background:#5856d61a;color:#5856d6}.unassigned-hint{font-size:13px;color:var(--text-tertiary);font-style:italic}.drop-zone.importing{opacity:.6;pointer-events:none}@media(max-width:1024px){.admin-grid{grid-template-columns:1fr}.form-row-4{grid-template-columns:1fr 1fr}}@media(max-width:768px){.mobile-header{display:flex}.mobile-tab-bar{display:flex;align-items:stretch;justify-content:space-around;background:#ffffffeb;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-top:1px solid var(--border);padding-bottom:max(var(--safe-bottom),8px);flex-shrink:0;z-index:200;position:relative}.mobile-tab-bar a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:6px 12px;font-size:10px;font-weight:600;color:var(--text-tertiary);text-decoration:none;flex:1;transition:color var(--transition);-webkit-tap-highlight-color:transparent}.mobile-tab-bar a .tab-icon{font-size:22px;line-height:1}.mobile-tab-bar a.active{color:var(--accent)}.sidebar{display:none}.app-layout{flex-direction:column;position:fixed;inset:0;height:100dvh;height:-webkit-fill-available}.main-content{flex:1;min-height:0;overflow:hidden}.page-header{padding:14px 16px;position:relative}.page-body{padding:16px;overflow-y:auto;-webkit-overflow-scrolling:touch}.form-row-2,.form-row-3,.form-row-4{grid-template-columns:1fr}.modal{max-width:100%;max-height:90dvh;border-radius:var(--radius-lg) var(--radius-lg) 0 0;margin-top:auto}.modal-overlay{align-items:flex-end;padding:0}.modal-body{padding:12px 20px 20px}.modal-header{padding:16px 20px 10px}.modal-footer{padding:12px 20px;padding-bottom:calc(12px + var(--safe-bottom))}.page-header h2{font-size:18px}.data-table{font-size:13px}.data-table th,.data-table td{padding:8px 10px}.sidebar-footer{display:none}.card-body{padding:16px}.card-header{padding:14px 16px}.drop-zone{padding:28px 16px}.empty-state{padding:40px 16px}.toast-container{inset:auto 12px 80px}.toast{max-width:100%}.grade-section{padding:12px 14px}.homeroom-chips{gap:6px}.homeroom-chip{padding:6px 10px;font-size:13px}.skill-rating-dot{width:40px;height:40px;font-size:15px}.check-pill{padding:8px 16px;font-size:14px}.form-section{margin-top:16px;margin-bottom:12px}}@media(max-width:480px){.page-header-actions{width:100%;justify-content:stretch}.page-header-actions .btn{flex:1}.stats-grid{grid-template-columns:1fr 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