:root{--bg-primary: #0a0a0f;--bg-secondary: #12121a;--bg-card: rgba(255, 255, 255, .04);--bg-card-hover: rgba(255, 255, 255, .07);--bg-elevated: rgba(255, 255, 255, .06);--bg-input: rgba(255, 255, 255, .06);--border: rgba(255, 255, 255, .08);--border-focus: rgba(99, 102, 241, .5);--text-primary: #f0f0f5;--text-secondary: #8b8b9e;--text-muted: #5a5a6e;--accent: #6366f1;--accent-hover: #818cf8;--accent-muted: rgba(99, 102, 241, .15);--success: #10b981;--success-muted: rgba(16, 185, 129, .15);--danger: #ef4444;--danger-muted: rgba(239, 68, 68, .15);--warning: #f59e0b;--warning-muted: rgba(245, 158, 11, .15);--teal: #14b8a6;--teal-muted: rgba(20, 184, 166, .15);--purple: #a855f7;--purple-muted: rgba(168, 85, 247, .15);--pink: #ec4899;--pink-muted: rgba(236, 72, 153, .15);--orange: #f97316;--orange-muted: rgba(249, 115, 22, .15);--blue: #3b82f6;--blue-muted: rgba(59, 130, 246, .15);--class-colors: var(--accent), var(--teal), var(--purple), var(--pink), var(--orange), var(--blue), var(--warning);--sidebar-width: 240px;--radius-sm: 6px;--radius: 10px;--radius-lg: 14px;--radius-xl: 20px;--shadow: 0 4px 24px rgba(0, 0, 0, .3);--shadow-lg: 0 8px 40px rgba(0, 0, 0, .5);--transition: .15s cubic-bezier(.4, 0, .2, 1);--transition-slow: .3s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-primary);color:var(--text-primary);font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased}#app{display:flex;height:100vh;overflow:hidden}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#fff3}#sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:24px 12px;gap:4px;overflow-y:auto}.sidebar-brand{display:flex;align-items:center;gap:10px;padding:8px 12px;margin-bottom:24px}.sidebar-brand-icon{width:36px;height:36px;background:linear-gradient(135deg,var(--accent),var(--purple));border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-size:18px}.sidebar-brand h1{font-size:16px;font-weight:700;letter-spacing:-.3px}.sidebar-clock-banner{background:var(--warning-muted);color:var(--warning);font-size:11px;font-weight:600;font-family:var(--font-mono, monospace);text-align:center;padding:5px 8px;border-radius:var(--radius);margin:-16px 8px 16px}.sidebar-section{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.8px;color:var(--text-muted);padding:16px 12px 6px}.sidebar-link{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius);color:var(--text-secondary);text-decoration:none;font-size:14px;font-weight:500;cursor:pointer;transition:all var(--transition);border:none;background:none;width:100%;text-align:left}.sidebar-link:hover{background:var(--bg-card-hover);color:var(--text-primary)}.sidebar-link.active{background:var(--accent-muted);color:var(--accent-hover)}.sidebar-link svg{width:18px;height:18px;flex-shrink:0}#content{flex:1;overflow-y:auto;padding:32px}.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px}.page-header h2{font-size:24px;font-weight:700;letter-spacing:-.5px}.page-header-actions{display:flex;gap:10px}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius);font-family:inherit;font-size:13px;font-weight:600;cursor:pointer;border:1px solid transparent;transition:all var(--transition);text-decoration:none;white-space:nowrap}.btn svg{width:16px;height:16px}.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}.btn-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);transform:translateY(-1px);box-shadow:0 4px 16px #6366f14d}.btn-secondary{background:var(--bg-elevated);color:var(--text-primary);border-color:var(--border)}.btn-secondary:hover{background:var(--bg-card-hover);border-color:#ffffff26}.btn-danger{background:var(--danger-muted);color:var(--danger);border-color:transparent}.btn-danger:hover{background:var(--danger);color:#fff}.btn-success{background:var(--success);color:#fff}.btn-success:hover{background:#059669;transform:translateY(-1px);box-shadow:0 4px 16px #10b9814d}.btn-sm{padding:5px 10px;font-size:12px}.btn-icon{padding:8px;border-radius:var(--radius)}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:all var(--transition)}.card:hover{background:var(--bg-card-hover);border-color:#ffffff1f}.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.card-title{font-size:16px;font-weight:600}.form-group{margin-bottom:16px}.form-label{display:block;font-size:12px;font-weight:600;color:var(--text-secondary);margin-bottom:6px;text-transform:uppercase;letter-spacing:.5px}.form-input,.form-select,.form-textarea{width:100%;padding:10px 14px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);font-family:inherit;font-size:14px;transition:all var(--transition);outline:none}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px #6366f11a}.form-textarea{resize:vertical;min-height:80px}.form-select{-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238b8b9e' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.form-inline{display:flex;gap:10px;align-items:flex-end}.table-container{overflow-x:auto;border-radius:var(--radius-lg);border:1px solid var(--border);background:var(--bg-card)}table{width:100%;border-collapse:collapse}th{text-align:left;padding:12px 16px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.7px;color:var(--text-muted);border-bottom:1px solid var(--border);background:var(--bg-elevated)}td{padding:12px 16px;border-bottom:1px solid var(--border);font-size:14px;vertical-align:middle}tr:last-child td{border-bottom:none}tr:hover td{background:var(--bg-card-hover)}.clickable-row{cursor:pointer}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 8px;border-radius:20px;font-size:11px;font-weight:600}.badge-accent{background:var(--accent-muted);color:var(--accent-hover)}.badge-teal{background:var(--teal-muted);color:var(--teal)}.badge-purple{background:var(--purple-muted);color:var(--purple)}.badge-pink{background:var(--pink-muted);color:var(--pink)}.badge-orange{background:var(--orange-muted);color:var(--orange)}.badge-blue{background:var(--blue-muted);color:var(--blue)}.badge-success{background:var(--success-muted);color:var(--success)}.badge-danger{background:var(--danger-muted);color:var(--danger)}.badge-warning{background:var(--warning-muted);color:var(--warning)}.calendar-nav{display:flex;align-items:center;gap:16px;margin-bottom:20px}.calendar-nav h3{font-size:18px;font-weight:600;min-width:240px}.calendar-grid{display:grid;grid-template-columns:60px repeat(7,1fr);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;background:var(--bg-card);min-height:600px}.calendar-header-cell{padding:12px 8px;text-align:center;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-secondary);background:var(--bg-elevated);border-bottom:1px solid var(--border);border-right:1px solid var(--border)}.calendar-header-cell:last-child{border-right:none}.calendar-header-cell.today{color:var(--accent)}.calendar-header-date{display:block;font-size:20px;font-weight:700;letter-spacing:-.5px;margin-top:2px;color:var(--text-primary)}.calendar-header-cell.today .calendar-header-date{color:var(--accent)}.calendar-time-label{padding:4px 8px;font-size:11px;color:var(--text-muted);text-align:right;border-right:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--bg-secondary);height:60px;display:flex;align-items:flex-start;justify-content:flex-end}.calendar-day-column{border-right:1px solid var(--border);position:relative;min-height:60px;border-bottom:1px solid var(--border)}.calendar-day-column:last-child{border-right:none}.calendar-event{position:absolute;left:3px;right:3px;border-radius:var(--radius-sm);padding:4px 8px;font-size:12px;font-weight:600;cursor:pointer;overflow:hidden;transition:all var(--transition);z-index:1;border-left:3px solid}.calendar-event:hover{transform:scale(1.02);z-index:2;box-shadow:var(--shadow)}.calendar-event-time{font-size:10px;font-weight:400;opacity:.8;display:block;margin-top:1px}.calendar-event.charged{opacity:.5}.roll-student{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--border);transition:background var(--transition)}.roll-student:last-child{border-bottom:none}.roll-student:hover{background:var(--bg-card-hover)}.roll-student-info{display:flex;align-items:center;gap:12px}.roll-avatar{width:36px;height:36px;border-radius:50%;background:var(--accent-muted);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600}.roll-student-name{font-weight:600}.roll-student-price{font-size:12px;color:var(--text-secondary)}.roll-actions{display:flex;gap:6px}.roll-btn{padding:6px 14px;border-radius:20px;font-size:12px;font-weight:600;cursor:pointer;border:1px solid var(--border);background:var(--bg-input);color:var(--text-secondary);transition:all var(--transition)}.roll-btn.present{background:var(--success-muted);color:var(--success);border-color:var(--success)}.roll-btn.absent{background:var(--danger-muted);color:var(--danger);border-color:var(--danger)}.roll-btn:disabled{opacity:.5;cursor:not-allowed;pointer-events:none}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .15s ease}.modal{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-xl);padding:28px;width:90%;max-width:520px;max-height:85vh;overflow-y:auto;box-shadow:var(--shadow-lg);animation:slideUp .2s ease}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.modal-title{font-size:18px;font-weight:700}.modal-close{width:32px;height:32px;border-radius:50%;border:none;background:var(--bg-card);color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition)}.modal-close:hover{background:var(--danger-muted);color:var(--danger)}.modal-footer{display:flex;justify-content:flex-end;gap:10px;margin-top:24px;padding-top:16px;border-top:1px solid var(--border)}.toast-container{position:fixed;bottom:24px;right:24px;z-index:2000;display:flex;flex-direction:column;gap:8px}.toast{padding:12px 20px;border-radius:var(--radius);font-size:13px;font-weight:500;animation:slideIn .3s ease,fadeOut .3s ease 2.7s forwards;box-shadow:var(--shadow);display:flex;align-items:center;gap:8px}.toast-success{background:var(--success-muted);color:var(--success);border:1px solid rgba(16,185,129,.3)}.toast-error{background:var(--danger-muted);color:var(--danger);border:1px solid rgba(239,68,68,.3)}.toast-info{background:var(--accent-muted);color:var(--accent-hover);border:1px solid rgba(99,102,241,.3)}.balance-positive{color:var(--success)}.balance-negative{color:var(--danger)}.balance-zero{color:var(--text-muted)}.tab-bar{display:flex;gap:4px;margin-bottom:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:4px;width:fit-content}.tab-item{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:var(--radius-sm);font-family:inherit;font-size:13px;font-weight:600;cursor:pointer;border:none;background:transparent;color:var(--text-secondary);transition:all var(--transition)}.tab-item:hover{color:var(--text-primary);background:var(--bg-elevated)}.tab-item.active{background:var(--accent-muted);color:var(--accent-hover)}.tab-count{display:inline-flex;align-items:center;justify-content:center;min-width:20px;height:20px;padding:0 6px;border-radius:10px;font-size:11px;font-weight:700;background:var(--accent-muted);color:var(--accent)}.tab-item.active .tab-count{background:#ffffff26;color:var(--accent-hover)}.tab-count-muted{background:var(--bg-elevated);color:var(--text-muted)}.deleted-row td{opacity:.6}.deleted-row:hover td{opacity:.85}.deleted-name{font-weight:600;color:var(--text-secondary)}.deleted-avatar,.deleted-avatar-lg{background:var(--bg-elevated)!important;color:var(--text-muted)!important}.student-detail-header{display:flex;align-items:center;gap:20px;margin-bottom:28px}.student-avatar-lg{width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--purple));display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:700;color:#fff}.student-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin-bottom:28px}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px}.stat-label{font-size:11px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px}.stat-value{font-size:24px;font-weight:700;margin-top:4px}.search-wrapper{position:relative;max-width:300px}.search-wrapper svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);width:16px;height:16px;color:var(--text-muted)}.search-input{width:100%;padding:9px 14px 9px 36px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);font-family:inherit;font-size:13px;outline:none;transition:all var(--transition)}.search-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px #6366f11a}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px;text-align:center}.empty-state svg{width:48px;height:48px;color:var(--text-muted);margin-bottom:16px}.empty-state h3{font-size:16px;font-weight:600;margin-bottom:8px}.empty-state p{color:var(--text-secondary);font-size:14px;max-width:300px}.checkbox-item{display:flex;align-items:center;gap:10px;padding:8px 0}.checkbox-item input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent);cursor:pointer}.notes-editor{background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius);padding:14px;min-height:120px;color:var(--text-primary);font-family:inherit;font-size:14px;line-height:1.6;resize:vertical;width:100%;outline:none;transition:border-color var(--transition)}.notes-editor:focus{border-color:var(--border-focus)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(40px)}to{opacity:1;transform:translate(0)}}@keyframes fadeOut{0%{opacity:1}to{opacity:0}}.page-enter{animation:fadeIn .2s ease,slideUp .2s ease}@media(max-width:768px){#sidebar{width:64px;min-width:64px;padding:16px 8px}.sidebar-brand h1,.sidebar-link span,.sidebar-section{display:none}.sidebar-brand{justify-content:center;margin-bottom:16px}.sidebar-link{justify-content:center;padding:10px}#content{padding:20px}.form-row{grid-template-columns:1fr}.calendar-grid{grid-template-columns:40px repeat(7,1fr);min-height:400px}}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}.mt-2{margin-top:8px}.mt-4{margin-top:16px}.mb-4{margin-bottom:16px}.text-sm{font-size:12px}.text-muted{color:var(--text-secondary)}.font-mono{font-family:SF Mono,Consolas,monospace}.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.w-full{width:100%}.hidden{display:none!important}