body {
    font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #e2e8f0;
    color: #1e293b;
    display: flex;
    justify-content: center;
    padding: 40px 20px;
    margin: 0;
    line-height: 1.5;
}

.contenedor {
    background-color: #ffffff;
    width: 100%;
    max-width: 800px;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #0f172a;
    font-size: clamp(1.35rem, 3vw, 1.85rem);
    margin: 0 0 0.5rem;
}

header p {
    text-align: center;
    color: #64748b;
    margin: 0 0 30px;
}

.calculadora-destacada {
    background-color: #f8fafc;
    border: 2px solid #cbd5e1;
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 40px;
}

.calculadora-destacada h2 {
    color: #0369a1;
    margin-top: 0;
    margin-bottom: 0.35rem;
    font-size: 1.25rem;
}

.calculadora-secundaria {
    background-color: #ffffff;
    border: 1px dashed #94a3b8;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 30px;
}

.calculadora-secundaria h2 {
    margin-top: 0;
    margin-bottom: 0.35rem;
    font-size: 1.15rem;
    color: #0f172a;
}

.texto-secundario {
    font-size: 0.9em;
    color: #475569;
    margin: 0 0 1rem;
}

.grid-2-columnas {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.grid-2-columnas > section {
    margin-bottom: 0;
}

.grid-2-columnas > div > label:first-of-type {
    margin-top: 0;
}

.panel-formulario--plano {
    background: transparent;
    border: none;
    padding: 0;
    margin-bottom: 0;
}

.panel-formulario {
    margin-bottom: 15px;
}

.panel-formulario h3 {
    font-size: 1rem;
    margin: 0 0 0.5rem;
    color: #0f172a;
}

.panel-formulario label:first-of-type {
    margin-top: 0;
}

label {
    font-weight: bold;
    font-size: 0.85em;
    color: #475569;
    display: block;
    margin-top: 15px;
    margin-bottom: 5px;
}

input {
    width: 100%;
    padding: 10px;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 1rem;
}

input:focus {
    outline: none;
    border-color: #0369a1;
    box-shadow: 0 0 0 2px rgba(3, 105, 161, 0.2);
}

button {
    width: 100%;
    background-color: #0369a1;
    color: white;
    border: none;
    padding: 16px;
    font-size: 1.1em;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 20px;
}

button:hover {
    filter: brightness(1.05);
}

.btn-secundario {
    background-color: #64748b;
}

.resultado-caja {
    background-color: #f0fdf4;
    border-left: 5px solid #16a34a;
    padding: 20px;
    border-radius: 6px;
    margin-top: 20px;
}

.resultado-caja p {
    margin: 0.5rem 0 0;
}

.resultado-caja p:first-child {
    margin-top: 0;
}

.resultado-caja--contado {
    border-left-color: #64748b;
    background-color: #f8fafc;
}

.resultado-destacado {
    color: #15803d;
    font-weight: bold;
    font-size: 1.2em;
}

.contenedor-grafico {
    margin-top: 30px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.nomenclatura {
    background-color: #f1f5f9;
    padding: 20px;
    border-radius: 8px;
    font-size: 0.85em;
    color: #475569;
}

.nomenclatura h3 {
    font-size: 1em;
    color: #0f172a;
    margin: 0 0 0.75rem;
    padding-bottom: 0.35rem;
    border-bottom: 1px solid #cbd5e1;
}

.nomenclatura p {
    margin: 0.65rem 0 0;
}

.nomenclatura p:first-of-type {
    margin-top: 0;
}

.nomenclatura strong {
    color: #0f172a;
}

.error {
    margin-top: 20px;
    padding: 14px 16px;
    border-radius: 8px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
    font-size: 0.9rem;
}

#resultadoApalancada:empty,
#resultadoContado:empty {
    display: none;
}

@media (max-width: 600px) {
    .contenedor {
        padding: 24px 18px;
    }

    .grid-2-columnas {
        grid-template-columns: 1fr;
    }
}