body {
    font-family: Arial, sans-serif;
    background: #f7f7fa;
    margin: 0;
    padding: 0;
}
main {
    max-width: 700px;
    margin: 2rem auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px #0001;
    padding: 2rem;
}
h1 {
    text-align: center;
    color: #2a3a5a;
}
.texto {
    color: #333;
    line-height: 1.6;
}
#selectorModo {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}
#seccionContenido, #seccionResultados {
    margin: 1.5rem 0;
}
.pregunta {
    background: #f0f4fa;
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1rem;
}
label {
    cursor: pointer;
}
.option-label {
    display: block;
    padding: 0.3em 0;
    border-radius: 6px;
    overflow-x: auto;
    overflow-y: hidden;
}
button {
    background: #2a3a5a;
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 0.5rem 1.2rem;
    font-size: 1rem;
    cursor: pointer;
    margin-top: 1rem;
}
button:hover {
    background: #3b4a6b;
}
#temporizador {
    font-weight: bold;
    color: #c0392b;
    margin-bottom: 1rem;
}
#seccionResultados ul {
    list-style: disc inside;
    color: #c0392b;
}

/* Feedback styles */
.question-feedback {
    margin-bottom: 1.5rem;
    padding: 1rem;
    border-radius: 5px;
}
.rCorrecta {
    background-color: #e8f5e9;
    border-left: 4px solid #4caf50;
}
.rIncorrecta {
    background-color: #ffebee;
    border-left: 4px solid #f44336;
}
.options-feedback {
    margin-top: 0.5rem;
}
.option {
    padding: 0.5rem;
    margin: 0.3rem 0;
    border-radius: 3px;
    position: relative;
    overflow-x: auto;
    overflow-y: hidden;
}
.respuesta-correcta {
    background-color: #c8e6c9;
    font-weight: bold;
}
.respuesta-usuario:not(.respuesta-correcta) {
    background-color: #ffcdd2;
    text-decoration: line-through;
}
.detalle-error {
    background: #ffeaea;
    border-left: 4px solid #c0392b;
    margin: 1rem 0;
    padding: 0.7rem 1rem;
    border-radius: 5px;
}
.detalle-error .incorrecta {
    color: #c0392b;
    font-weight: bold;
}
.detalle-error .correcta {
    color: #27ae60;
    font-weight: bold;
}
.feedback-icon {
    margin-left: 0.5rem;
    font-weight: bold;
}
.feedback-container {
    margin-top: 1.5rem;
}
.examples {
    text-align: center;
    overflow-x: auto;
    overflow-y: hidden;
}

.MathJax {
    font-size: 1.1em;
    color: #2c3e50;
}

/* Modal styles */
.modal-resolucion {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.4);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-content {
    background: #fff;
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    padding: 2rem 1.5rem 1.5rem 1.5rem;
    box-shadow: 0 4px 24px #0002;
    position: relative;
    text-align: left;
    max-height: 80vh;
    overflow-y: auto;
    overflow-x: auto;
}
.texto-resolucion {
    margin: 1rem 0 2rem 0;
    color: #2c3e50;
    font-size: 1.1em;
}
.cerrar-modal {
    background: #2a3a5a;
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 0.5rem 1.2rem;
    font-size: 1rem;
    cursor: pointer;
    margin-top: 1rem;
}
.cerrar-modal:hover {
    background: #3b4a6b;
}

@media (max-width: 600px) {
    main {
        padding: 1rem;
    }
    #selectorModo {
        flex-direction: column;
        gap: 0.5rem;
    }
    .modal-content {
        padding: 1rem;
    }
}