:root{--primary:#6366f1;--primary-dark:#4f46e5;--success:#10b981;--success-dark:#059669;--danger:#ef4444;--danger-dark:#dc2626;--warning:#f59e0b;--bg-primary:#0f0f23;--bg-secondary:#1a1a2e;--bg-card:#16213e;--bg-card-hover:#1e3a5f;--text-primary:#fff;--text-secondary:#a0aec0;--text-muted:#718096;--border-color:#ffffff1a;--shadow-sm:0 2px 4px #0000004d;--shadow-md:0 4px 12px #0006;--shadow-lg:0 8px 24px #00000080;--spacing-xs:.25rem;--spacing-sm:.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--radius-sm:.5rem;--radius-md:.75rem;--radius-lg:1rem;--radius-full:9999px}*{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--bg-primary);height:100%;color:var(--text-primary);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;overflow-x:hidden}body{background:linear-gradient(135deg,var(--bg-primary)0%,var(--bg-secondary)100%);min-height:100vh}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--primary);border-radius:var(--radius-full)}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(100%)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.skeleton{background:linear-gradient(90deg,var(--bg-card)0%,var(--bg-card-hover)50%,var(--bg-card)100%);border-radius:var(--radius-sm);background-size:200% 100%;animation:1.5s infinite shimmer}.skeleton-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin-bottom:var(--spacing-md)}.skeleton-text{height:1rem;margin-bottom:.5rem}.skeleton-text-lg{height:1.5rem;margin-bottom:.5rem}.skeleton-button{width:80px;height:2.5rem}.fade-in{animation:.3s ease-out forwards fadeIn}.slide-up{animation:.4s ease-out forwards slideUp}.spinner{border:3px solid #fff3;border-top-color:var(--text-primary);border-radius:50%;width:24px;height:24px;animation:.8s linear infinite spin}.btn{justify-content:center;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md)var(--spacing-lg);border-radius:var(--radius-md);cursor:pointer;text-transform:uppercase;letter-spacing:.5px;border:none;font-size:1rem;font-weight:600;transition:all .2s;display:inline-flex}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-success{background:linear-gradient(135deg,var(--success)0%,var(--success-dark)100%);color:#fff;box-shadow:0 4px 14px #10b98166}.btn-success:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #10b98180}.btn-success:active:not(:disabled){transform:translateY(0)}.btn-danger{background:linear-gradient(135deg,var(--danger)0%,var(--danger-dark)100%);color:#fff;box-shadow:0 4px 14px #ef444466}.btn-danger:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #ef444480}.btn-danger:active:not(:disabled){transform:translateY(0)}.btn-warning{background:linear-gradient(135deg,var(--warning)0%,#d97706 100%);color:#fff;box-shadow:0 4px 14px #f59e0b66}.btn-warning:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #f59e0b80}.btn-warning:active:not(:disabled){transform:translateY(0)}.btn-primary{background:linear-gradient(135deg,var(--primary)0%,var(--primary-dark)100%);color:#fff;box-shadow:0 4px 14px #6366f166}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #6366f180}.btn-secondary{color:var(--text-secondary);border:1px solid var(--border-color);background:0 0}.btn-secondary:hover:not(:disabled){border-color:var(--text-secondary);background:#ffffff0d}.input{width:100%;padding:var(--spacing-md);color:var(--text-primary);border:1px solid var(--border-color);border-radius:var(--radius-md);background:#ffffff0d;outline:none;font-size:1rem;transition:all .2s}.input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6366f133}.input::placeholder{color:var(--text-muted)}.card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-md);transition:all .3s}.card:hover{background:var(--bg-card-hover);box-shadow:var(--shadow-lg);border-color:#6366f14d;transform:translateY(-2px)}.badge{padding:var(--spacing-xs)var(--spacing-sm);text-transform:uppercase;letter-spacing:.5px;border-radius:var(--radius-full);align-items:center;font-size:.75rem;font-weight:600;display:inline-flex}.badge-success{color:var(--success);background:#10b98133}.badge-warning{color:var(--warning);background:#f59e0b33}.badge-primary{color:var(--primary);background:#6366f133}.badge-secondary{color:#9ca3af;background:#6b728033}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);padding:var(--spacing-lg);z-index:1000;background:#000c;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-xl);width:100%;max-width:420px;box-shadow:var(--shadow-lg)}.modal-overlay.bottom-sheet{align-items:flex-end;padding:0}.modal.bottom-sheet{touch-action:none;border-bottom:none;border-radius:1.5rem 1.5rem 0 0;max-width:100%;max-height:85vh;padding-top:.5rem;animation:.3s cubic-bezier(.32,.72,0,1) slideUpSheet}@keyframes slideUpSheet{0%{transform:translateY(100%)}to{transform:translateY(0)}}@keyframes slideDownSheet{0%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(100%)}}.modal.bottom-sheet.closing{animation:.25s cubic-bezier(.32,.72,0,1) forwards slideDownSheet}.modal-overlay.bottom-sheet.closing{animation:.25s forwards fadeOut}@keyframes fadeOut{0%{opacity:1}to{opacity:0}}.bottom-sheet-handle{background:var(--text-muted);opacity:.5;border-radius:3px;width:36px;height:5px;margin:.5rem auto 1rem}.modal-title{margin-bottom:var(--spacing-sm);background:linear-gradient(135deg,var(--primary)0%,#a855f7 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:1.5rem;font-weight:700}.modal-subtitle{color:var(--text-secondary);margin-bottom:var(--spacing-lg)}.form-group{margin-bottom:var(--spacing-lg)}.form-label{color:var(--text-secondary);margin-bottom:var(--spacing-sm);font-size:.875rem;font-weight:500;display:block}.container{max-width:480px;padding:var(--spacing-lg);margin:0 auto;padding-bottom:100px}.header{text-align:center;margin-bottom:var(--spacing-xl);padding-top:var(--spacing-lg)}.header-title{background:linear-gradient(135deg,var(--primary)0%,#a855f7 100%);-webkit-text-fill-color:transparent;margin-bottom:var(--spacing-xs);-webkit-background-clip:text;background-clip:text;font-size:1.75rem;font-weight:800}.header-subtitle{color:var(--text-muted);font-size:.875rem}.class-list{gap:var(--spacing-md);flex-direction:column;display:flex}.class-card{margin-bottom:var(--spacing-md);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-md);transition:all .3s}.class-card:hover{background:var(--bg-card-hover);border-color:#6366f14d}.class-header{margin-bottom:var(--spacing-md);justify-content:space-between;align-items:flex-start;display:flex}.class-name{color:var(--text-primary);margin-bottom:var(--spacing-xs);font-size:1.125rem;font-weight:700}.class-meta{gap:var(--spacing-sm);margin-bottom:var(--spacing-md);flex-wrap:wrap;display:flex}.class-info{align-items:center;gap:var(--spacing-xs);color:var(--text-secondary);font-size:.875rem;display:flex}.class-info svg{opacity:.7;width:16px;height:16px}.class-actions{gap:var(--spacing-sm);grid-template-columns:1fr 1fr;display:grid}.class-actions .btn{padding:var(--spacing-sm)var(--spacing-md);font-size:.875rem}.status-dot{width:8px;height:8px;margin-right:var(--spacing-xs);border-radius:50%;display:inline-block}.status-dot.active{background:var(--success);box-shadow:0 0 8px var(--success)}.status-dot.inactive{background:var(--text-muted)}.empty-state{text-align:center;padding:var(--spacing-xl)var(--spacing-lg);color:var(--text-muted)}.empty-state-icon{margin-bottom:var(--spacing-md);opacity:.5;font-size:3rem}.toast-container{bottom:var(--spacing-lg);z-index:1001;position:fixed;left:50%;transform:translate(-50%)}.toast{padding:var(--spacing-md)var(--spacing-lg);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);font-weight:500;animation:.3s ease-out slideUp}.toast-success{background:var(--success);color:#fff}.toast-error{background:var(--danger);color:#fff}.floating-buttons{top:var(--spacing-lg);right:var(--spacing-lg);z-index:100;align-items:center;gap:.5rem;display:flex;position:fixed}.settings-btn{border-radius:var(--radius-full);background:var(--bg-card);border:1px solid var(--border-color);width:44px;height:44px;color:var(--text-secondary);cursor:pointer;justify-content:center;align-items:center;font-size:1.2rem;transition:all .2s;display:flex}.settings-btn:hover{background:var(--bg-card-hover);color:var(--text-primary);border-color:var(--primary)}.loading-container{padding:var(--spacing-xl);justify-content:center;align-items:center;gap:var(--spacing-md);flex-direction:column;display:flex}.loading-text{color:var(--text-muted);font-size:.875rem}.date-header{align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-md);padding-bottom:var(--spacing-sm);border-bottom:1px solid var(--border-color);display:flex}.date-header-text{color:var(--text-muted);font-size:.875rem;font-weight:500}.recorded-badge{top:var(--spacing-sm);right:var(--spacing-sm);color:var(--success);padding:var(--spacing-xs)var(--spacing-sm);border-radius:var(--radius-full);background:#10b98133;align-items:center;gap:4px;font-size:.7rem;font-weight:600;display:flex;position:absolute}.class-card{position:relative}.textarea{width:100%;min-height:80px;padding:var(--spacing-md);color:var(--text-primary);border:1px solid var(--border-color);border-radius:var(--radius-md);resize:vertical;background:#ffffff0d;outline:none;font-family:Monaco,Consolas,monospace;font-size:.875rem;transition:all .2s}.textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6366f133}