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 de la plantilla */
.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;
}

.formulario { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 15px; }
.formulario label { font-weight: bold; }
.formulario input { padding: 6px 10px; border: 1px solid #cbd5e0; border-radius: 4px; width: 140px; font-size: 1rem; letter-spacing: 1px; text-align: center; }

.resultado { background-color: #e6fffa; border: 1px solid #b2f5ea; color: #234e52; padding: 10px; border-radius: 4px; font-weight: bold; display: inline-block; margin-top: 5px; }
code { background-color: #edf2f7; color: #c53030; padding: 2px 6px; border-radius: 4px; font-family: monospace; }