* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f5f5;
    color: #222;
}

.contenedor {
    width: 90%;
    max-width: 1100px;
    margin: 40px auto;
}

.encabezado {
    background: #1f4e79;
    color: white;
    padding: 20px;
}

.encabezado h1 {
    margin: 0;
}

.navegacion {
    margin-top: 15px;
}

.navegacion a {
    color: white;
    text-decoration: none;
    margin-right: 15px;
}

.tarjeta {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.boton {
    display: inline-block;
    background: #1f4e79;
    color: white;
    text-decoration: none;
    border: none;
    border-radius: 6px;
    padding: 10px 16px;
    cursor: pointer;
}

.boton-secundario {
    background: #555;
}

.formulario {
    background: white;
    padding: 25px;
    border-radius: 8px;
    max-width: 500px;
    margin: 40px auto;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.formulario input,
.formulario select {
    width: 100%;
    padding: 10px;
    margin-top: 6px;
    margin-bottom: 16px;
    border: 1px solid #ccc;
    border-radius: 6px;
}

.mensaje {
    padding: 12px;
    background: #e8f4fd;
    border-left: 4px solid #1f4e79;
    margin-bottom: 20px;
}

.precio {
    font-size: 20px;
    font-weight: bold;
    color: #1f4e79;
}

.productos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

@media (max-width: 600px) {
    .contenedor {
        width: 94%;
    }

    .navegacion a {
        display: block;
        margin-bottom: 8px;
    }
}