:root{--bg-primary: #0f0f23;--bg-secondary: #1a1a2e;--bg-card: #16213e;--bg-input: #0f3460;--accent: #e94560;--accent-hover: #ff6b81;--text-primary: #e0e0e0;--text-secondary: #a0a0b0;--text-muted: #606080;--success: #2ecc71;--warning: #f39c12;--danger: #e74c3c;--info: #3498db;--border: #2a2a4a;--shadow: 0 4px 20px rgba(0,0,0,.3);--radius: 12px;--radius-sm: 8px;--nav-height: 64px;--bottom-nav-height: 64px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;overscroll-behavior:none}a{color:var(--accent);text-decoration:none}.app-container{min-height:100dvh;display:flex;flex-direction:column}.header{height:var(--nav-height);background:var(--bg-secondary);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 16px;position:sticky;top:0;z-index:100}.header-logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:18px;color:var(--accent)}.header-logo-icon{width:36px;height:36px;background:linear-gradient(135deg,var(--accent),#0f3460);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;color:#fff;font-weight:900}.header-actions{display:flex;align-items:center;gap:12px}.header-btn{background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:8px;border-radius:var(--radius-sm);transition:all .2s;font-size:20px}.header-btn:hover{background:var(--bg-card);color:var(--accent)}.header-btn .badge{position:absolute;top:4px;right:4px;background:var(--accent);color:#fff;font-size:10px;width:16px;height:16px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700}.main-content{flex:1;padding:16px;padding-bottom:calc(var(--bottom-nav-height) + 24px);overflow-y:auto}.bottom-nav{position:fixed;bottom:0;left:0;right:0;height:var(--bottom-nav-height);background:var(--bg-secondary);border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-around;z-index:100;padding-bottom:env(safe-area-inset-bottom)}.nav-item{display:flex;flex-direction:column;align-items:center;gap:2px;background:none;border:none;color:var(--text-muted);cursor:pointer;padding:6px 12px;border-radius:var(--radius-sm);transition:all .2s;font-size:10px;min-width:56px}.nav-item.active{color:var(--accent)}.nav-item:hover{color:var(--accent-hover)}.nav-item-icon{font-size:22px}.card{background:var(--bg-card);border-radius:var(--radius);padding:16px;border:1px solid var(--border);margin-bottom:12px}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.card-title{font-size:14px;font-weight:700;color:var(--text-secondary);text-transform:uppercase;letter-spacing:1px}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:16px}.stat-card{background:var(--bg-card);border-radius:var(--radius);padding:16px;border:1px solid var(--border);text-align:center}.stat-value{font-size:28px;font-weight:900;line-height:1;margin-bottom:4px}.stat-label{font-size:11px;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px}.stat-card.accent .stat-value{color:var(--accent)}.stat-card.success .stat-value{color:var(--success)}.stat-card.warning .stat-value{color:var(--warning)}.stat-card.danger .stat-value{color:var(--danger)}.stat-card.info .stat-value{color:var(--info)}.student-card{display:flex;align-items:center;gap:12px;padding:12px;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);margin-bottom:8px;cursor:pointer;transition:all .2s}.student-card:hover{border-color:var(--accent)}.student-avatar{width:48px;height:48px;border-radius:50%;background:var(--bg-input);display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;color:var(--accent);flex-shrink:0;overflow:hidden}.student-avatar img{width:100%;height:100%;object-fit:cover}.student-info{flex:1;min-width:0}.student-name{font-weight:600;font-size:15px;margin-bottom:2px}.student-detail{font-size:12px;color:var(--text-secondary)}.belt-badge{display:inline-flex;align-items:center;gap:4px;padding:3px 8px;border-radius:12px;font-size:11px;font-weight:600;flex-shrink:0}.belt-dot{width:10px;height:10px;border-radius:50%;border:1px solid rgba(255,255,255,.2)}.status-badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:12px;font-size:11px;font-weight:600}.status-active{background:#2ecc7126;color:var(--success)}.status-inactive{background:#e74c3c26;color:var(--danger)}.status-pending{background:#f39c1226;color:var(--warning)}.status-paid{background:#2ecc7126;color:var(--success)}.status-overdue{background:#e74c3c26;color:var(--danger)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border-radius:var(--radius-sm);font-size:14px;font-weight:600;border:none;cursor:pointer;transition:all .2s;width:100%}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-secondary{background:var(--bg-input);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{border-color:var(--accent)}.btn-success{background:var(--success);color:#fff}.btn-danger{background:var(--danger);color:#fff}.btn-sm{padding:8px 16px;font-size:12px}.btn-icon{width:40px;padding:8px}.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{width:100%;padding:12px 16px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:15px;transition:border-color .2s;outline:none}.form-input:focus{border-color:var(--accent)}.form-input::placeholder{color:var(--text-muted)}select.form-input{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23a0a0b0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}.attendance-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(80px,1fr));gap:8px}.attendance-item{display:flex;flex-direction:column;align-items:center;gap:6px;padding:12px 8px;background:var(--bg-card);border-radius:var(--radius);border:2px solid var(--border);cursor:pointer;transition:all .2s}.attendance-item.present{border-color:var(--success);background:#2ecc711a}.attendance-item.absent{border-color:var(--danger);background:#e74c3c1a}.attendance-item.late{border-color:var(--warning);background:#f39c121a}.attendance-avatar{width:48px;height:48px;border-radius:50%;background:var(--bg-input);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;color:var(--accent);overflow:hidden}.attendance-name{font-size:11px;text-align:center;line-height:1.2;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.payment-card{padding:16px;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);margin-bottom:8px}.payment-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.payment-amount{font-size:20px;font-weight:800}.payment-detail{font-size:12px;color:var(--text-secondary);margin-bottom:4px}.alert-card{padding:12px 16px;background:var(--bg-card);border-radius:var(--radius);border-left:4px solid var(--accent);margin-bottom:8px}.alert-card.overdue{border-left-color:var(--danger)}.alert-card.ready{border-left-color:var(--success)}.alert-card.absent{border-left-color:var(--warning)}.alert-title{font-weight:600;font-size:14px;margin-bottom:4px}.alert-message{font-size:12px;color:var(--text-secondary)}.alert-time{font-size:10px;color:var(--text-muted);margin-top:4px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;display:flex;align-items:flex-end;justify-content:center;z-index:200;padding:16px}.modal-content{background:var(--bg-secondary);border-radius:var(--radius) var(--radius) 0 0;width:100%;max-width:480px;max-height:80dvh;overflow-y:auto;padding:24px 16px;animation:slideUp .3s ease}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.modal-title{font-size:18px;font-weight:700}.modal-close{background:none;border:none;color:var(--text-secondary);font-size:24px;cursor:pointer;padding:4px}.search-bar{position:relative;margin-bottom:16px}.search-bar input{width:100%;padding:12px 16px 12px 44px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);font-size:15px;outline:none}.search-bar input:focus{border-color:var(--accent)}.search-bar .search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-muted);font-size:18px}.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.page-title{font-size:24px;font-weight:800}.tabs{display:flex;gap:4px;background:var(--bg-card);padding:4px;border-radius:var(--radius);margin-bottom:16px}.tab{flex:1;padding:8px 12px;border:none;background:none;color:var(--text-secondary);font-size:12px;font-weight:600;border-radius:var(--radius-sm);cursor:pointer;transition:all .2s}.tab.active{background:var(--accent);color:#fff}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px 24px;text-align:center}.empty-icon{font-size:48px;margin-bottom:16px;opacity:.5}.empty-title{font-size:16px;font-weight:600;margin-bottom:8px}.empty-text{font-size:13px;color:var(--text-secondary)}.loading{display:flex;align-items:center;justify-content:center;padding:48px}.spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.login-container{min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:24px;background:var(--bg-primary)}.login-card{width:100%;max-width:360px}.login-logo{text-align:center;margin-bottom:32px}.login-logo-icon{width:72px;height:72px;background:linear-gradient(135deg,var(--accent),#0f3460);border-radius:18px;display:inline-flex;align-items:center;justify-content:center;font-size:32px;color:#fff;font-weight:900;margin-bottom:12px}.login-title{font-size:24px;font-weight:900;color:var(--accent);letter-spacing:2px}.login-subtitle{font-size:13px;color:var(--text-secondary);margin-top:4px}.login-error{background:#e74c3c26;color:var(--danger);padding:10px 14px;border-radius:var(--radius-sm);font-size:13px;margin-bottom:16px}.fab{position:fixed;bottom:calc(var(--bottom-nav-height) + 16px);right:16px;width:56px;height:56px;border-radius:50%;background:var(--accent);color:#fff;border:none;font-size:28px;cursor:pointer;box-shadow:0 4px 20px #e9456066;display:flex;align-items:center;justify-content:center;z-index:50;transition:transform .2s}.fab:hover{transform:scale(1.1)}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.offline-bar{background:var(--warning);color:#000;text-align:center;padding:4px;font-size:11px;font-weight:600}@media (min-width: 768px){.main-content{max-width:600px;margin:0 auto}.stats-grid{grid-template-columns:repeat(4,1fr)}}