body {

    margin: 0;

    font-family: Arial, Helvetica, sans-serif;

    background: #f5f7fa;
}

.calculadora-main { min-height: 62vh; padding: 1px 0; }

.contenedor {

    width: 500px;

    margin: 80px auto;

    padding: 30px;

    border-radius: 20px;

    background: white;

    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

@media (max-width: 600px) {
    .contenedor { width: min(100% - 32px, 500px); margin: 48px auto; padding: 24px; }
    .acciones { flex-direction: column; }
    #volver, #inicio { width: 100%; }
}

h1 {

    text-align: center;
}

.boton {

    width: 100%;

    margin-top: 15px;

    padding: 15px;

    border: none;

    border-radius: 12px;

    cursor: pointer;
}

input {

    width: 100%;

    padding: 12px;

    border: 1px solid #d8d8d8;

    border-radius: 10px;

    box-sizing: border-box;

    margin-bottom: 20px;

    font-size: 16px;
}

#calcularIVA {

    width: 100%;

    padding: 15px;

    border: none;

    border-radius: 12px;

    background: #1769aa;

    color: white;

    font-size: 16px;

    cursor: pointer;

    margin-top: 10px;
}

#calcularIVA:hover {

    opacity: 0.9;
}

#resultadoIVA,
#resultadoTotal {

    font-size: 25px;

    font-weight: bold;

    color: #1769aa;
}

.acciones {

    display: flex;

    justify-content: space-between;

    align-items: center;

    gap: 15px;

    margin-top: 25px;
}

#volver,
#inicio {

    flex: 1;

    display: flex;

    justify-content: center;

    align-items: center;

    gap: 10px;

    padding: 15px;

    border: none;

    border-radius: 15px;

    background: #1769aa;

    color: white;

    font-size: 18px;

    cursor: pointer;

    transition: 0.3s;
}

#volver:hover,
#inicio:hover {

    opacity: 0.9;
}