body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    color: #333;
    padding: 20px;
    margin: 0;
}

h1 {
    color: #2c3e50;
    border-bottom: 2px solid #2c3e50;
    padding-bottom: 10px;
}

h2 {
    color: #2c3e50;
    margin-top: 5px;
}

.ejercicio {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 25px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* Azul bonito */
.explicacion {
    background-color: #ebf8ff;
    border-left: 4px solid #3182ce;
    color: #2b6cb0;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 0 6px 6px 0;
    font-size: 0.95rem;
}

.tabla-opciones {
    width: 100%;
    max-width: 600px;
    border-collapse: collapse;
    margin-bottom: 15px;
}

.tabla-opciones th {
    background-color: #edf2f7;
    color: #4a5568;
    text-align: left;
    padding: 8px 12px;
    font-size: 0.9rem;
    border-bottom: 1px solid #cbd5e0;
}

.tabla-opciones td {
    padding: 12px;
    border-bottom: 1px solid #e2e8f0;
}

.tabla-opciones label {
    cursor: pointer;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.resultado {
    background-color: #e6fffa;
    border: 1px solid #b2f5ea;
    color: #234e52;
    padding: 10px;
    border-radius: 4px;
    font-weight: bold;
    display: inline-block;
    margin-top: 5px;
}

.error-msg {
    background-color: #fff5f5;
    border-color: #fed7d7;
    color: #9b2c2c;
}