body{margin:0;padding:0}#root{min-height:100vh}:root{--fitness-purple: #6C5CE7;--fitness-orange: #FF6B35;--fitness-green: #00D9A3;--fitness-blue: #4A90E2;--fitness-pink: #FF5E7D;--gradient-primary: linear-gradient(135deg, #6C5CE7 0%, #A29BFE 100%);--gradient-energy: linear-gradient(135deg, #FF6B35 0%, #FF9068 100%);--gradient-success: linear-gradient(135deg, #00D9A3 0%, #5FE3A1 100%);--gradient-card: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);--primary: var(--fitness-purple);--primary-light: #A29BFE;--secondary: var(--fitness-orange);--success: var(--fitness-green);--warning: #f39c12;--danger: #e74c3c;--white: #FFFFFF;--gray-50: #F9FAFB;--gray-100: #F3F4F6;--gray-200: #E5E7EB;--gray-300: #d1d5db;--gray-400: #9ca3af;--gray-500: #6b7280;--gray-600: #6B7280;--gray-700: #374151;--gray-800: #1f2937;--gray-900: #111827;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .06);--shadow: 0 1px 3px 0 rgba(0, 0, 0, .1), 0 1px 2px 0 rgba(0, 0, 0, .06);--shadow-md: 0 4px 12px rgba(108, 92, 231, .15);--shadow-lg: 0 10px 30px rgba(108, 92, 231, .25);--shadow-xl: 0 20px 50px rgba(108, 92, 231, .35)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:linear-gradient(135deg,#f9fafb,#e5e7eb);color:var(--gray-900);line-height:1.6}.app-container{min-height:100vh;display:flex;flex-direction:column}.app-header{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 100%);color:#fff;padding:2rem 1.5rem;text-align:center;box-shadow:var(--shadow-md)}.app-header h1{font-size:2rem;font-weight:700;margin-bottom:.5rem}.subtitle{font-size:1rem;opacity:.9}.app-main{flex:1;max-width:1200px;width:100%;margin:0 auto;padding:2rem 1.5rem}.controls{display:flex;justify-content:flex-end;margin-bottom:1.5rem}.btn{padding:.875rem 2rem;font-size:1rem;font-weight:700;border-radius:12px;border:none;cursor:pointer;transition:all .3s ease;text-transform:uppercase;letter-spacing:.5px;box-shadow:var(--shadow-md);position:relative;overflow:hidden;display:inline-flex;align-items:center;gap:.5rem}.btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:#fff3;transition:left .5s ease}.btn:hover:before{left:100%}.btn:active{transform:translateY(0)}.btn-primary{background:var(--gradient-primary);color:var(--white)}.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn-secondary{background:var(--white);color:var(--fitness-purple);border:2px solid var(--fitness-purple);box-shadow:var(--shadow-sm)}.btn-secondary:hover{background:var(--fitness-purple);color:var(--white);transform:translateY(-2px)}.btn-success{background:var(--gradient-success);color:var(--white)}.btn-success:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn-danger{background-color:var(--danger);color:#fff}.btn-danger:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn-sm{padding:.5rem 1rem;font-size:.875rem}.app-footer{background-color:#fff;border-top:1px solid var(--gray-200);padding:1.5rem;text-align:center;color:var(--gray-500);font-size:.875rem}.card{background:var(--white);border-radius:20px;box-shadow:var(--shadow-lg);padding:2rem;margin-bottom:1.5rem;border:none;transition:transform .3s ease,box-shadow .3s ease}.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-xl)}.form-group{margin-bottom:1.25rem}.form-group label{display:block;font-weight:600;color:var(--gray-700);margin-bottom:.5rem;font-size:.875rem}.form-control{width:100%;padding:1rem 1.25rem;font-size:1rem;font-weight:500;color:var(--gray-900);background-color:var(--white);border:2px solid var(--gray-200);border-radius:12px;transition:all .3s ease;box-shadow:var(--shadow-sm)}.form-control:focus{outline:none;border-color:var(--fitness-purple);box-shadow:0 0 0 4px #6c5ce71a,var(--shadow-md);transform:translateY(-2px)}.form-control:hover{border-color:var(--fitness-purple)}.form-control:disabled{background-color:var(--gray-100);cursor:not-allowed;opacity:.7}select.form-control{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%236C5CE7' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 1rem center;background-size:20px;padding-right:3rem;cursor:pointer;font-weight:600}select.form-control optgroup{font-weight:700;font-size:.9375rem;color:var(--fitness-purple);background:linear-gradient(90deg,var(--gray-100) 0%,var(--white) 100%);padding:.75rem 1rem;font-style:normal;margin-top:.25rem;letter-spacing:.5px;text-transform:uppercase}select.form-control option{font-weight:500;color:var(--gray-900);padding:.75rem 1.25rem;background-color:var(--white);font-size:.9375rem}select.form-control option:hover,select.form-control option:checked{background:linear-gradient(90deg,rgba(108,92,231,.1) 0%,var(--white) 100%);color:var(--fitness-purple)}#class_select{min-height:3.5rem;font-size:1rem;background-color:var(--gray-50);border-width:2px}#class_select:focus{background-color:var(--white)}.checkbox-wrapper{display:flex;align-items:center;gap:.5rem}.checkbox-wrapper input[type=checkbox]{width:1.25rem;height:1.25rem;cursor:pointer}.alert{padding:1rem;border-radius:.5rem;margin-bottom:1rem}.alert-error{background-color:#fee2e2;border:1px solid #fecaca;color:#991b1b}.alert-success{background-color:#d1fae5;border:1px solid #a7f3d0;color:#065f46}.loading{display:flex;justify-content:center;align-items:center;padding:3rem;color:var(--gray-500)}.spinner{border:3px solid var(--gray-200);border-top-color:var(--primary);border-radius:50%;width:2rem;height:2rem;animation:spin .8s linear infinite;margin-right:.75rem}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{text-align:center;padding:3rem 1.5rem;color:var(--gray-500)}.empty-state svg{margin:0 auto 1rem;opacity:.5}@media(max-width:768px){.app-header h1{font-size:1.5rem}.app-main,.card{padding:1rem}}