:root {
    --color-texto: #666666;
    --color-acento: #F85418;
    --color-oscuro: #003C40;
    --color-titulo: #100888;
    --color-fondo-claro: #F0F0F0;
    --color-borde: #68B8B8;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--color-texto);
    background: #ffffff;
}

a { color: var(--color-texto); text-decoration: none; }
a:hover { color: var(--color-acento); }

.contenedor {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 16px;
}

header.sitio {
    background: url('../images/fondo_28.png') center/cover no-repeat;
    padding: 24px 16px;
}
header.sitio img.logo { max-width: 260px; display: block; }

nav.principal {
    background: #ffffff;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 18px;
    padding: 10px 0;
    border-bottom: 1px solid #eee;
}
nav.principal a { display: inline-flex; align-items: center; gap: 6px; font-size: 0.85rem; }
nav.principal img { width: 28px; height: 28px; }

.buscador {
    background: linear-gradient(#f7f7f7, #e9e9e9);
    padding: 14px 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}
.buscador form { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.buscador input[type="text"], .buscador select { padding: 4px 6px; }
.buscador button, .boton {
    background: var(--color-acento);
    color: #fff;
    border: none;
    padding: 6px 14px;
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.85rem;
}
.boton.secundario { background: var(--color-oscuro); }

main.contenido {
    display: grid;
    grid-template-columns: 1fr 220px;
    gap: 24px;
    padding: 24px 16px;
    max-width: 1000px;
    margin: 0 auto;
}
@media (max-width: 700px) {
    main.contenido { grid-template-columns: 1fr; }
}

.panel-titulo {
    background: var(--color-oscuro);
    color: #fff;
    text-align: center;
    padding: 6px;
    font-size: 0.9rem;
    font-weight: bold;
    text-transform: uppercase;
}

.grilla-libros {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 14px;
}
.libro-card {
    border: 1px solid #eee;
    padding: 8px;
    text-align: center;
    font-size: 0.8rem;
}
.libro-card img { max-width: 100%; height: 140px; object-fit: contain; }
.libro-card .titulo { font-weight: bold; color: var(--color-titulo); min-height: 2.4em; }
.libro-card .precio { color: var(--color-titulo); font-weight: bold; }

.destacados-list { list-style: none; margin: 0; padding: 8px; font-size: 0.8rem; }
.destacados-list li { padding: 4px 0; border-bottom: 1px solid #eee; }

table.tabla { width: 100%; border-collapse: collapse; margin-bottom: 12px; }
table.tabla th { background: var(--color-borde); color: #fff; padding: 6px; font-size: 0.85rem; }
table.tabla td { padding: 6px; border-bottom: 1px solid #eee; font-size: 0.85rem; text-align: center; }

form.formulario-app label { display: block; margin: 10px 0 2px; font-size: 0.85rem; }
form.formulario-app input[type=text], form.formulario-app input[type=password],
form.formulario-app input[type=email], form.formulario-app select, form.formulario-app textarea {
    width: 100%; max-width: 400px; padding: 6px; border: 1px solid #ccc; border-radius: 3px;
}
.checkbox-areas { display: flex; flex-wrap: wrap; gap: 10px; max-width: 500px; }
.checkbox-areas label { display: flex; align-items: center; gap: 4px; font-size: 0.8rem; margin: 0; }

.mensaje-flash {
    background: #fff3cd;
    border: 1px solid #ffe69c;
    padding: 10px 14px;
    margin: 12px 0;
    border-radius: 4px;
    font-size: 0.9rem;
}
.mensaje-error {
    background: #fde2e1;
    border: 1px solid #f5a9a4;
    color: #7a1a12;
    padding: 10px 14px;
    margin: 12px 0;
    border-radius: 4px;
    font-size: 0.9rem;
}

footer.sitio {
    background: var(--color-oscuro);
    color: #cfe7e7;
    text-align: center;
    padding: 16px;
    font-size: 0.8rem;
    margin-top: 24px;
}

.ficha-libro { display: flex; gap: 20px; flex-wrap: wrap; }
.ficha-libro img { max-width: 200px; }
.ficha-libro dl { display: grid; grid-template-columns: 120px 1fr; gap: 4px 10px; font-size: 0.9rem; }
.ficha-libro dt { font-weight: bold; }