*{box-sizing:border-box;margin:0;padding:0}body{color:#333;background:#fff;min-height:100vh;padding:4px;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}#ejercicio-1{background:linear-gradient(135deg,#fff,#ffffff87)}.container{background:#fff;border-radius:10px;max-width:100%;margin:0 auto;padding:15px;box-shadow:0 2px 10px #0000001a}.container-index{max-width:100%}.subtitle{text-align:center;color:#7f8c8d;margin-bottom:20px;font-size:.9rem}.ejercicios-grid{grid-template-columns:1fr;gap:15px;display:grid}.ejercicio-card{color:#2c3e50;background:#ecf0f1;border-radius:8px;padding:15px;text-decoration:none;transition:transform .3s,box-shadow .3s;display:block}.ejercicio-card h2{color:#3498db;margin-bottom:8px;font-size:1.2rem}.ejercicio-card p{color:#7f8c8d;font-size:.85rem}.btn{color:#fff;cursor:pointer;background:#3498db;border:none;border-radius:5px;margin:5px 0;padding:12px 20px;font-size:14px;transition:background .3s}.btn-danger{background:#e74c3c}.lista .btn-danger{color:#fff;border-style:none;border-radius:3px;width:fit-content;padding:2px 8px}.btn-success{background:#27ae60}.btn-warning{background:#f39c12}input[type=button],input[type=text],input[type=number],textarea,select{border:1px solid #ddd;border-radius:5px;width:100%;margin:8px 0;padding:12px;font-size:16px}input[type=button]:focus,input[type=text]:focus,textarea:focus{border-color:#3498db;outline:none}.lista{margin-top:20px;list-style:none}.lista li{background:#ecf0f1;border-radius:5px;margin:10px 0 0;padding:15px}#listaDinamica li,#listaTareas li{border-radius:5px;justify-content:space-between;align-items:center;gap:8px;display:flex}#listaElementos{text-wrap:nowrap;flex-wrap:wrap;column-gap:8px;display:flex}.lista-texto{word-break:break-word;flex-grow:2}.tarea-completada{opacity:.6;text-decoration:line-through}.back-link{color:#3498db;border-radius:5px;margin-top:20px;padding:10px;text-decoration:none;transition:background .3s;display:inline-block}.button-group{justify-content:center;margin:20px 0}.grid-4{grid-template-columns:repeat(1,1fr);gap:0;margin:10px 0;display:grid}.grid-3,.grid-2{grid-template-columns:repeat(1,1fr);gap:0;display:grid}.temporizador,.resultado{text-align:center;color:#ecf0f1;word-break:break-word;text-wrap:balance;background:#2c3e50;border-radius:10px;margin:20px 0;padding:20px;font-family:monospace}.temporizador{font-size:32px}.resultado{margin:8px 0;font-size:24px}#password{font-size:16px}.estado-temporizador{text-align:center;color:#7f8c8d;margin-top:10px;font-size:14px}.card{background:#f8f9fa;border-radius:8px;margin:15px 0;padding:15px}#dale{color:#ff6b6b;min-height:60px;margin-top:20px;font-size:1.2rem;font-weight:700}.ejercicios-nav ul{margin:0;padding:0;list-style:none}.main-footer{text-align:center;background-color:#f5f5f5;border-radius:8px;margin-top:2rem;padding:1rem;font-size:.875rem}.creator-link{color:#3498db;font-weight:700;text-decoration:none}.creator-link:hover{text-decoration:underline}.text-center{text-align:center}.exercise-header{text-align:center;margin-bottom:25px}.exercise-header h1{color:#2c3e50;text-wrap:balance;margin-bottom:10px;font-size:24px;line-height:30px}@media (width>=480px){body{padding:10px}.ejercicios-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}.grid-4{grid-template-columns:repeat(2,1fr);column-gap:8px}.grid-3{grid-template-columns:repeat(3,1fr);gap:8px}.grid-2{grid-template-columns:repeat(2,1fr);gap:8px}#password{font-size:18px}.exercise-header{margin-bottom:30px}.exercise-header h1{font-size:26px;line-height:34px}}@media (width>=768px){body{padding:20px}.container{max-width:800px;padding:30px}.container-index{max-width:1024px}.subtitle{margin-bottom:30px;font-size:1rem}.ejercicio-card{padding:20px}.ejercicio-card:hover{transform:translateY(-5px);box-shadow:0 5px 20px #00000026}.ejercicio-card h2{font-size:1.5rem}.btn{width:auto;margin:5px;padding:10px 20px;font-size:16px}.btn:hover{opacity:.9;transform:translateY(-2px)}.grid-4{grid-template-columns:repeat(4,1fr);display:grid}.tarea-item input[type=checkbox]{position:unset}.tarea-item{flex-direction:row;align-items:center}.temporizador,.resultado{font-size:36px}#password{font-size:22px}.exercise-header{margin-bottom:35px}.exercise-header h1{margin-bottom:10px;font-size:30px}.main-footer{margin-top:3rem;padding:1.5rem;font-size:1rem}.back-link:hover{background:#ecf0f1}#dale{font-size:1.5rem}}