* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f4f4;
    padding: 10px;
    line-height: 1.6;
}

.container {
    max-width: 50%;
    margin: 0 auto;
    padding: 10px;
}

#registro {
    background: #ffffff;
    padding: 20px;
    max-width: 100%;
    margin: 20px auto;
    box-shadow: 0px 2px 10px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    border: 2px solid #007bff;
}

#registro h2 {
    color: #007bff;
    margin-bottom: 15px;
}

input {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
}

input:focus {
    border-color: #007bff;
    outline: none;
}

button {
    padding: 12px 20px;
    margin: 10px 5px;
    cursor: pointer;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.3s ease;
    width: 100%;
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.button-group button {
    flex: 1 1 45%;
    min-width: 120px;
}

#ejercicios {
    display: none;
    background: white;
    padding: 15px;
    width: 100%;
    margin: 20px auto;
    box-shadow: 0px 2px 10px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    border: 2px solid #28a745;
}

#mensajeBienvenida {
    font-size: 1.5rem;
    font-weight: bold;
    color: #28a745;
    margin: 10px 0;
}

#puntaje {
    font-size: 1.2rem;
    font-weight: bold;
    color: white;
    background-color: #17a2b8;
    padding: 10px;
    border-radius: 8px;
    margin: 10px auto;
    display: inline-block;
}

.table-container {
    width: 100%;
    overflow-x: auto;
    margin: 15px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #f7f0f4;
    box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.1);
    border: 1px solid #00ff95;
}

th {
    background-color: #d36cab;
    color: white;
    padding: 12px 8px;
    font-size: 1,2rem;
}

td {
    border: 1px solid #007bff;
    padding: 10px 8px;
    text-align: left;
    font-size: 1.2rem;
}

input[type="number"] {
    width: 80px;
    text-align: center;
    padding: 8px;
    border: 2px solid #dc3545;
    border-radius: 5px;
    font-weight: bold;
    font-size: 16px;
    color: #dc3545;
    background-color: #fff5f5;
}

.respuesta-correcta {
    background-color: #d4edda !important;
    border: 2px solid #28a745 !important;
    color: #28a745 !important;
}

.respuesta-incorrecta {
    background-color: #f8d7da !important;
    border: 2px solid #dc3545 !important;
    color: #dc3545 !important;
}

#resultado {
    margin-top: 15px;
    padding: 10px;
    border-radius: 5px;
    font-weight: bold;
}

/* Estilos para botones específicos */
#verificar {
    background-color: #007bff;
    color: white;
}

#verificar:enabled:hover {
    background-color: #0056b3;
}

#nuevoEjercicio {
    background-color: #17a2b8;
    color: white;
}

#nuevoEjercicio:enabled:hover {
    background-color: #138496;
}

button:disabled {
    background-color: #cccccc;
    color: #666666;
    cursor: not-allowed;
}

/* Media Queries para tablets y móviles */
@media (max-width: 768px) {
    #registro, #ejercicios {
        padding: 15px;
        margin: 10px auto;
    }
    
    th, td {
        padding: 8px 5px;
        font-size: 0.8rem;
    }
    
    input[type="number"] {
        width: 70px;
        padding: 6px;
        font-size: 14px;
    }
    
    button {
        padding: 10px 15px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    #mensajeBienvenida {
        font-size: 1.2rem;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .button-group button {
        width: 100%;
    }
    
    td:first-child {
        word-break: break-word;
    }
}