/* Estilos básicos y botones modernos */
.chi-wrap { max-width: 720px; padding: 12px; }
.chi-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.chi-grid label { display: flex; flex-direction: column; font-size: 14px; }
.chi-grid input, .chi-grid select { padding: 10px; border: 1px solid #d1d5db; border-radius: 6px; font-size: 16px; }

.chi-buttons { display: flex; justify-content: flex-end; gap: 10px; margin-top: 12px; }
.chi-buttons button { padding: 10px 16px; font-size: 15px; border: none; border-radius: 6px; cursor: pointer; }
.chi-buttons button:hover { opacity: 0.95; }
.chi-buttons button:first-child { background-color: #e5e7eb; color: #111827; }
.chi-buttons .chi-calcular { background-color: #2872fa; color: #ffffff; }

.chi-resultado { margin-top: 18px; font-size: 22px; font-weight: 700; color: #111827; }
@media (max-width: 640px) {
  .chi-grid { grid-template-columns: 1fr; }
}