/* ==========================================================================
   Librería — hoja de estilos propia
   Construida sobre Bootstrap 5.3. Se apoya en data-bs-theme para el modo
   oscuro, de modo que los componentes de Bootstrap y estos estilos cambien
   de tema a la vez.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Tokens de diseño
   -------------------------------------------------------------------------- */

:root,
[data-bs-theme="light"] {
    --lib-papel: #faf7f2;
    --lib-papel-alto: #ffffff;
    --lib-tinta: #211c18;
    --lib-tinta-suave: #6b615a;
    --lib-borde: #e6ddd1;
    --lib-acento: #a2482a;
    --lib-acento-suave: #f3e4dd;
    --lib-sombra: 0 1px 2px rgba(33, 28, 24, .04), 0 8px 24px -12px rgba(33, 28, 24, .18);
    --lib-sombra-alta: 0 2px 4px rgba(33, 28, 24, .06), 0 18px 40px -16px rgba(33, 28, 24, .28);

    --lib-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
    --lib-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --lib-radio: 10px;
}

[data-bs-theme="dark"] {
    --lib-papel: #16130f;
    --lib-papel-alto: #201b16;
    --lib-tinta: #ede6dc;
    --lib-tinta-suave: #a39689;
    --lib-borde: #332b23;
    --lib-acento: #e2825b;
    --lib-acento-suave: #33211a;
    --lib-sombra: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px -12px rgba(0, 0, 0, .7);
    --lib-sombra-alta: 0 2px 4px rgba(0, 0, 0, .5), 0 18px 40px -16px rgba(0, 0, 0, .8);
}

/* Puentes hacia las variables de Bootstrap: así los componentes nativos
   (form-control, alert…) heredan la paleta de la librería. */
:root,
[data-bs-theme="light"],
[data-bs-theme="dark"] {
    --bs-body-bg: var(--lib-papel);
    --bs-body-color: var(--lib-tinta);
    --bs-border-color: var(--lib-borde);
    --bs-primary: var(--lib-acento);
    --bs-link-color: var(--lib-acento);
    --bs-link-hover-color: var(--lib-acento);
    --bs-focus-ring-color: rgba(162, 72, 42, .3);
}

[data-bs-theme="dark"] {
    --bs-focus-ring-color: rgba(226, 130, 91, .35);
}

/* --------------------------------------------------------------------------
   2. Base
   -------------------------------------------------------------------------- */

html {
    font-size: 15px;
}

@media (min-width: 768px) {
    html {
        font-size: 16px;
    }
}

body {
    font-family: var(--lib-sans);
    background-color: var(--lib-papel);
    color: var(--lib-tinta);
    /* Halo cálido muy tenue tras la cabecera, sin imágenes. */
    background-image: radial-gradient(ellipse 80% 45% at 50% -18%, var(--lib-acento-suave), transparent 70%);
    background-repeat: no-repeat;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, .lib-serif {
    font-family: var(--lib-serif);
    letter-spacing: -.015em;
}

h1 {
    font-weight: 600;
}

::selection {
    background: var(--lib-acento);
    color: #fff;
}

/* --------------------------------------------------------------------------
   3. Cabecera
   -------------------------------------------------------------------------- */

.lib-header {
    position: sticky;
    top: 0;
    z-index: 1030;
    background: color-mix(in srgb, var(--lib-papel) 82%, transparent);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--lib-borde);
}

.lib-marca {
    display: inline-flex;
    align-items: center;
    gap: .6rem;
    font-family: var(--lib-serif);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--lib-tinta);
    text-decoration: none;
    letter-spacing: -.02em;
}

.lib-marca:hover {
    color: var(--lib-acento);
}

/* Lomo de libro dibujado en CSS, hace de logotipo. */
.lib-marca__lomo {
    width: 1.1rem;
    height: 1.5rem;
    border-radius: 2px 4px 4px 2px;
    background: linear-gradient(105deg,
        var(--lib-acento) 0%,
        var(--lib-acento) 22%,
        color-mix(in srgb, var(--lib-acento) 65%, #000) 24%,
        var(--lib-acento) 26%);
    box-shadow: inset -2px 0 0 rgba(255, 255, 255, .22);
    flex: none;
}

.lib-nav-enlace {
    font-size: .9rem;
    font-weight: 500;
    color: var(--lib-tinta-suave);
    text-decoration: none;
    padding: .35rem 0;
    border-bottom: 2px solid transparent;
}

.lib-nav-enlace:hover,
.lib-nav-enlace[aria-current="page"] {
    color: var(--lib-tinta);
    border-bottom-color: var(--lib-acento);
}

/* Botón de cambio de tema */
.lib-tema {
    display: grid;
    place-items: center;
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    border: 1px solid var(--lib-borde);
    border-radius: 50%;
    background: var(--lib-papel-alto);
    color: var(--lib-tinta-suave);
    cursor: pointer;
    transition: color .15s, border-color .15s, transform .15s;
}

.lib-tema:hover {
    color: var(--lib-acento);
    border-color: var(--lib-acento);
    transform: rotate(-15deg);
}

.lib-tema svg {
    width: 1.05rem;
    height: 1.05rem;
}

/* Sólo se ve el icono que corresponde al tema activo. */
[data-bs-theme="light"] .lib-tema__luna { display: none; }
[data-bs-theme="dark"] .lib-tema__sol { display: none; }

/* --------------------------------------------------------------------------
   4. Encabezado de página
   -------------------------------------------------------------------------- */

.lib-titulo-pagina {
    font-size: clamp(1.9rem, 1.4rem + 2vw, 2.7rem);
    margin: 0;
}

.lib-superlinea {
    font-family: var(--lib-sans);
    font-size: .72rem;
    font-weight: 600;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--lib-acento);
    margin-bottom: .35rem;
}

.lib-subtitulo {
    color: var(--lib-tinta-suave);
    margin: .4rem 0 0;
}

/* Filete decorativo bajo los títulos */
.lib-filete {
    border: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--lib-borde), transparent);
    margin: 1.5rem 0 2rem;
    opacity: 1;
}

/* --------------------------------------------------------------------------
   5. Tarjeta de libro
   -------------------------------------------------------------------------- */

.lib-rejilla {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(255px, 1fr));
    gap: 1.25rem;
}

.lib-tarjeta {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 1.4rem 1.4rem 1.15rem 1.75rem;
    background: var(--lib-papel-alto);
    border: 1px solid var(--lib-borde);
    border-radius: var(--lib-radio);
    box-shadow: var(--lib-sombra);
    overflow: hidden;
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

/* El lomo del libro: barra vertical en el borde izquierdo. */
.lib-tarjeta::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 6px;
    background: linear-gradient(180deg, var(--lib-acento), color-mix(in srgb, var(--lib-acento) 60%, #000));
    opacity: .85;
}

.lib-tarjeta:hover {
    transform: translateY(-3px);
    box-shadow: var(--lib-sombra-alta);
    border-color: color-mix(in srgb, var(--lib-acento) 35%, var(--lib-borde));
}

.lib-tarjeta__titulo {
    font-family: var(--lib-serif);
    font-size: 1.18rem;
    font-weight: 600;
    line-height: 1.3;
    margin: 0 0 .3rem;
    color: var(--lib-tinta);
    text-decoration: none;
    text-wrap: balance;
}

a.lib-tarjeta__titulo:hover {
    color: var(--lib-acento);
}

.lib-tarjeta__autor {
    font-size: .88rem;
    color: var(--lib-tinta-suave);
    font-style: italic;
    margin: 0 0 1rem;
}

.lib-tarjeta__pie {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: .75rem;
    margin-top: auto;
    padding-top: .9rem;
    border-top: 1px dashed var(--lib-borde);
}

.lib-precio {
    font-family: var(--lib-serif);
    font-size: 1.3rem;
    font-weight: 600;
    line-height: 1;
    color: var(--lib-tinta);
    font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------------------
   6. Indicador de stock
   -------------------------------------------------------------------------- */

.lib-stock {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    font-size: .74rem;
    font-weight: 600;
    letter-spacing: .04em;
    text-transform: uppercase;
    padding: .28rem .6rem;
    border-radius: 100px;
    border: 1px solid transparent;
    white-space: nowrap;
}

.lib-stock::before {
    content: "";
    width: .42rem;
    height: .42rem;
    border-radius: 50%;
    background: currentColor;
    flex: none;
}

.lib-stock--disponible {
    color: #1c6b47;
    background: #e6f4ec;
    border-color: #c3e6d3;
}

.lib-stock--ultimas {
    color: #8a5a09;
    background: #fdf3e0;
    border-color: #f3e0bb;
}

.lib-stock--agotado {
    color: #9a2f2f;
    background: #fbeaea;
    border-color: #f2cdcd;
}

[data-bs-theme="dark"] .lib-stock--disponible {
    color: #7fd6a6;
    background: rgba(28, 107, 71, .18);
    border-color: rgba(127, 214, 166, .28);
}

[data-bs-theme="dark"] .lib-stock--ultimas {
    color: #e8bd72;
    background: rgba(138, 90, 9, .22);
    border-color: rgba(232, 189, 114, .28);
}

[data-bs-theme="dark"] .lib-stock--agotado {
    color: #eb9494;
    background: rgba(154, 47, 47, .22);
    border-color: rgba(235, 148, 148, .28);
}

/* --------------------------------------------------------------------------
   7. Botones
   -------------------------------------------------------------------------- */

.lib-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .45rem;
    font-family: var(--lib-sans);
    font-size: .875rem;
    font-weight: 500;
    line-height: 1;
    padding: .58rem 1.05rem;
    border-radius: 8px;
    border: 1px solid transparent;
    text-decoration: none;
    cursor: pointer;
    transition: background-color .15s, color .15s, border-color .15s, transform .1s;
}

.lib-btn:active {
    transform: translateY(1px);
}

.lib-btn svg {
    width: .95rem;
    height: .95rem;
    flex: none;
}

.lib-btn--primario {
    background: var(--lib-acento);
    color: #fff;
    box-shadow: var(--lib-sombra);
}

.lib-btn--primario:hover {
    background: color-mix(in srgb, var(--lib-acento) 85%, #000);
    color: #fff;
}

.lib-btn--contorno {
    border-color: var(--lib-borde);
    color: var(--lib-tinta);
    background: var(--lib-papel-alto);
}

.lib-btn--contorno:hover {
    border-color: var(--lib-acento);
    color: var(--lib-acento);
}

.lib-btn--fantasma {
    color: var(--lib-tinta-suave);
    background: transparent;
}

.lib-btn--fantasma:hover {
    color: var(--lib-tinta);
    background: var(--lib-acento-suave);
}

.lib-btn--peligro {
    background: #a52a2a;
    color: #fff;
}

.lib-btn--peligro:hover {
    background: #8b2020;
    color: #fff;
}

.lib-btn--pequeno {
    font-size: .8rem;
    padding: .4rem .7rem;
}

.lib-acciones {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    align-items: center;
}

/* --------------------------------------------------------------------------
   8. Panel (formularios, fichas)
   -------------------------------------------------------------------------- */

.lib-panel {
    background: var(--lib-papel-alto);
    border: 1px solid var(--lib-borde);
    border-radius: var(--lib-radio);
    box-shadow: var(--lib-sombra);
    padding: 1.75rem;
}

@media (min-width: 768px) {
    .lib-panel {
        padding: 2.25rem;
    }
}

.lib-panel--peligro {
    border-color: color-mix(in srgb, #a52a2a 35%, var(--lib-borde));
    border-left: 4px solid #a52a2a;
}

/* Campos de formulario */
.lib-campo {
    margin-bottom: 1.35rem;
}

.lib-campo label {
    display: block;
    font-size: .8rem;
    font-weight: 600;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--lib-tinta-suave);
    margin-bottom: .4rem;
}

.lib-campo .form-control {
    background: var(--lib-papel);
    border: 1px solid var(--lib-borde);
    border-radius: 8px;
    color: var(--lib-tinta);
    padding: .65rem .85rem;
    font-size: .95rem;
    transition: border-color .15s, box-shadow .15s;
}

.lib-campo .form-control:focus {
    background: var(--lib-papel-alto);
    border-color: var(--lib-acento);
    box-shadow: 0 0 0 3px var(--bs-focus-ring-color);
}

.lib-campo .form-control.input-validation-error {
    border-color: #a52a2a;
}

.lib-ayuda {
    display: block;
    font-size: .8rem;
    color: var(--lib-tinta-suave);
    margin-top: .35rem;
    text-transform: none;
    letter-spacing: normal;
    font-weight: 400;
}

/* Mensajes de validación */
.field-validation-error,
.validation-summary-errors {
    display: block;
    font-size: .82rem;
    color: #a52a2a;
    margin-top: .35rem;
}

[data-bs-theme="dark"] .field-validation-error,
[data-bs-theme="dark"] .validation-summary-errors {
    color: #eb9494;
}

.validation-summary-errors ul {
    margin: 0;
    padding-left: 1.1rem;
}

/* Prefijo de moneda en el campo de precio */
.lib-grupo-campo {
    display: flex;
    align-items: stretch;
}

.lib-grupo-campo__prefijo {
    display: grid;
    place-items: center;
    padding: 0 .8rem;
    background: var(--lib-acento-suave);
    border: 1px solid var(--lib-borde);
    border-right: 0;
    border-radius: 8px 0 0 8px;
    color: var(--lib-tinta-suave);
    font-size: .9rem;
    font-weight: 600;
}

.lib-grupo-campo .form-control {
    border-radius: 0 8px 8px 0;
}

/* --------------------------------------------------------------------------
   9. Lista de datos (ficha de detalle)
   -------------------------------------------------------------------------- */

.lib-datos {
    margin: 0;
}

.lib-datos > div {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: .5rem 1rem;
    padding: .85rem 0;
    border-bottom: 1px dashed var(--lib-borde);
}

.lib-datos > div:last-child {
    border-bottom: 0;
}

.lib-datos dt {
    flex: 0 0 8.5rem;
    font-size: .78rem;
    font-weight: 600;
    letter-spacing: .05em;
    text-transform: uppercase;
    color: var(--lib-tinta-suave);
}

.lib-datos dd {
    margin: 0;
    font-size: 1rem;
    color: var(--lib-tinta);
}

/* --------------------------------------------------------------------------
   10. Estado vacío
   -------------------------------------------------------------------------- */

.lib-vacio {
    text-align: center;
    padding: 4rem 1.5rem;
    background: var(--lib-papel-alto);
    border: 1px dashed var(--lib-borde);
    border-radius: var(--lib-radio);
}

.lib-vacio svg {
    width: 2.75rem;
    height: 2.75rem;
    color: var(--lib-tinta-suave);
    opacity: .55;
    margin-bottom: 1rem;
}

.lib-vacio h2 {
    font-size: 1.3rem;
    margin-bottom: .4rem;
}

.lib-vacio p {
    color: var(--lib-tinta-suave);
    margin-bottom: 1.5rem;
}

/* --------------------------------------------------------------------------
   11. Pie
   -------------------------------------------------------------------------- */

.lib-footer {
    margin-top: auto;
    padding: 1.75rem 0;
    border-top: 1px solid var(--lib-borde);
    font-size: .85rem;
    color: var(--lib-tinta-suave);
}

/* --------------------------------------------------------------------------
   12. Accesibilidad
   -------------------------------------------------------------------------- */

:focus-visible {
    outline: 2px solid var(--lib-acento);
    outline-offset: 2px;
    border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: .01ms !important;
        animation-duration: .01ms !important;
    }

    .lib-tarjeta:hover,
    .lib-tema:hover,
    .lib-btn:active {
        transform: none;
    }
}