/* ============================================================
   Tutorial Bootstrap 5.3.8 · Estilos de la versión web
   Depende de Bootstrap 5.3.8 (ya cargado en index.html)
   ============================================================ */

:root {
    --tu-ancho-max: 62rem;
    --tu-alto-cabecera: 3.75rem;
    --tu-fuente-codigo: ui-monospace, SFMono-Regular, "SF Mono", Menlo,
                        Consolas, "Liberation Mono", monospace;
    --tu-borde-suave: rgba(128, 128, 128, .28);
    --tu-sombra-codigo: 0 1rem 2rem rgba(0, 0, 0, .08);
}

[data-bs-theme="dark"] {
    --tu-borde-suave: rgba(255, 255, 255, .18);
    --tu-sombra-codigo: 0 1rem 2rem rgba(0, 0, 0, .45);
}

/* ---------- Estructura ---------- */

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--tu-alto-cabecera) + 1rem);
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
}

body {
    font-size: 1rem;
    line-height: 1.7;
    padding-bottom: 4rem;
    /* Cinturón de seguridad: las tablas y los diagramas anchos viven dentro de
       contenedores con desplazamiento propio, pero un píxel de redondeo no
       debe poder desplazar la página entera. */
    overflow-x: clip;
}

.saltar-contenido {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 2000;
    padding: .75rem 1.25rem;
    background: var(--bs-primary);
    color: #fff;
    border-radius: 0 0 .5rem 0;
}

.saltar-contenido:focus {
    left: 0;
}

.fila {
    display: flex;
    align-items: stretch;
    gap: 0;
}

.contenido {
    flex: 1 1 auto;
    min-width: 0;
    max-width: calc(100% - 0rem);
    padding: 2rem 1rem 4rem;
    overflow-wrap: break-word;
}

.contenido > * {
    max-width: var(--tu-ancho-max);
    margin-inline: auto;
}

/* ---------- Cabecera ---------- */

.cabecera {
    background: color-mix(in srgb, var(--bs-body-bg) 88%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--tu-borde-suave);
    z-index: 1030;
    padding: .5rem 0;
    min-height: var(--tu-alto-cabecera);
}

.marca-icono {
    display: grid;
    place-items: center;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: .6rem;
    background: linear-gradient(135deg, #1f3a8a, #2b1a6b);
    color: #fff;
    font-weight: 700;
    font-size: .85rem;
    letter-spacing: .02em;
}

.marca strong { color: var(--bs-body-color); }
.marca small  { color: var(--bs-secondary-color); }

.resultados-busqueda {
    font-size: .8rem;
    color: var(--bs-secondary-color);
    padding: 0 1rem;
}

.marcado {
    background: color-mix(in srgb, var(--bs-warning) 45%, transparent);
    border-radius: .2rem;
    padding: 0 .1rem;
}

/* ---------- Índice lateral ---------- */

.panel-indice {
    flex: 0 0 17.5rem;
    width: 17.5rem;
    border-right: 1px solid var(--tu-borde-suave);
    padding: 1.25rem .75rem 3rem 1rem;
    position: sticky;
    top: var(--tu-alto-cabecera);
    height: calc(100vh - var(--tu-alto-cabecera));
    overflow-y: auto;
    overscroll-behavior: contain;
}

.etiqueta-panel {
    font-size: .72rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--bs-secondary-color);
    font-weight: 700;
    padding-left: .6rem;
    margin-bottom: .5rem;
}

.lista-indice {
    list-style: none;
    margin: 0;
    padding: 0;
    border-left: 2px solid var(--tu-borde-suave);
}

.item-indice { line-height: 1.35; }

.enlace-indice {
    display: block;
    padding: .3rem .6rem;
    font-size: .875rem;
    color: var(--bs-secondary-color);
    text-decoration: none;
    border-left: 2px solid transparent;
    margin-left: -2px;
    transition: color .15s ease, border-color .15s ease, background-color .15s ease;
}

.enlace-indice:hover,
.enlace-indice:focus-visible {
    color: var(--bs-primary);
    background-color: color-mix(in srgb, var(--bs-primary) 8%, transparent);
}

.enlace-indice.activo {
    color: var(--bs-primary);
    border-left-color: var(--bs-primary);
    font-weight: 600;
}

.item-indice.nivel-1 > .enlace-indice {
    font-weight: 600;
    color: var(--bs-body-color);
    margin-top: .5rem;
}

@media (max-width: 991.98px) {
    .panel-indice {
        position: fixed;
        inset: var(--tu-alto-cabecera) auto 0 0;
        z-index: 1020;
        background: var(--bs-body-bg);
        transform: translateX(-100%);
        transition: transform .25s ease;
        box-shadow: 0 0 2rem rgba(0, 0, 0, .18);
        height: auto;
    }

    .panel-indice.abierto { transform: translateX(0); }
}

.oculto-indice::before {
    content: "";
    position: fixed;
    inset: var(--tu-alto-cabecera) 0 0 0;
    background: rgba(0, 0, 0, .45);
    z-index: 1010;
}

/* ---------- Barra de progreso ---------- */

.barra-progreso {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: transparent;
    z-index: 1040;
}

.progreso {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, #1f3a8a, #a3e635);
    transition: width .1s linear;
}

/* ---------- Tipografía del contenido ---------- */

.contenido h1 {
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -.02em;
    margin-top: 3rem;
    padding-top: .5rem;
    scroll-margin-top: calc(var(--tu-alto-cabecera) + 1rem);
}

.contenido h2 {
    font-size: clamp(1.35rem, 2.6vw, 1.75rem);
    font-weight: 700;
    margin-top: 2.25rem;
    padding-bottom: .35rem;
    border-bottom: 1px solid var(--tu-borde-suave);
    scroll-margin-top: calc(var(--tu-alto-cabecera) + 1rem);
}

.contenido h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-top: 1.75rem;
    scroll-margin-top: calc(var(--tu-alto-cabecera) + 1rem);
}

.contenido h4 {
    font-size: 1.02rem;
    font-weight: 700;
    margin-top: 1.4rem;
}

.ancla-enlace {
    color: var(--bs-primary);
    text-decoration: none;
    opacity: 0;
    margin-right: .4rem;
    font-weight: 400;
}

h1:hover > .ancla-enlace,
h2:hover > .ancla-enlace,
h3:hover > .ancla-enlace,
.ancla-enlace:focus-visible { opacity: .6; }

.contenido p { margin-bottom: 1rem; }
.contenido ul, .contenido ol { margin-bottom: 1rem; }
.contenido li { margin-bottom: .3rem; }

.contenido blockquote {
    border-left: 4px solid var(--bs-primary);
    background: color-mix(in srgb, var(--bs-primary) 6%, transparent);
    padding: .75rem 1rem;
    border-radius: 0 .5rem .5rem 0;
    margin: 1rem 0;
}

.contenido blockquote p:last-child { margin-bottom: 0; }

.contenido hr {
    border: 0;
    border-top: 1px solid var(--tu-borde-suave);
    margin: 2.5rem 0;
}

/* ---------- Tablas ---------- */

.contenido .tabla-envoltura {
    overflow-x: auto;
    margin-bottom: 1.25rem;
    border: 1px solid var(--tu-borde-suave);
    border-radius: .6rem;
}

.contenido table {
    width: 100%;
    margin: 0;
    font-size: .9rem;
    border-collapse: collapse;
}

.contenido thead th {
    background: color-mix(in srgb, var(--bs-secondary) 12%, transparent);
    font-weight: 700;
    text-align: left;
    white-space: nowrap;
}

.contenido th,
.contenido td {
    padding: .55rem .75rem;
    border-bottom: 1px solid var(--tu-borde-suave);
    vertical-align: top;
}

.contenido tbody tr:last-child td { border-bottom: 0; }
.contenido tbody tr:hover { background: color-mix(in srgb, var(--bs-secondary) 6%, transparent); }

/* ---------- Código ---------- */

.contenido code {
    font-family: var(--tu-fuente-codigo);
    font-size: .875em;
}

.contenido :not(pre) > code {
    background: color-mix(in srgb, var(--bs-secondary) 14%, transparent);
    color: var(--bs-body-color);
    padding: .12em .38em;
    border-radius: .3rem;
    border: 1px solid var(--tu-borde-suave);
    /* Sin `nowrap`: en móvil las URL y las listas de clases largas se parten
       antes de desbordar la pantalla. */
    overflow-wrap: anywhere;
}

.bloque-codigo {
    margin: 1.25rem 0;
    border: 1px solid var(--tu-borde-suave);
    border-radius: .7rem;
    overflow: hidden;
    background: var(--bs-tertiary-bg, var(--bs-body-bg));
    box-shadow: var(--tu-sombra-codigo);
}

.barra-codigo {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .5rem;
    padding: .3rem .5rem .3rem .75rem;
    background: color-mix(in srgb, var(--bs-secondary) 12%, transparent);
    border-bottom: 1px solid var(--tu-borde-suave);
}

.punto-lenguaje {
    font-size: .7rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--bs-secondary-color);
}

.btn-copiar {
    display: inline-flex;
    align-items: center;
    gap: .3rem;
    font-size: .72rem;
    font-weight: 600;
    padding: .2rem .5rem;
    border: 1px solid var(--tu-borde-suave);
    border-radius: .4rem;
    background: transparent;
    color: var(--bs-secondary-color);
    cursor: pointer;
}

.btn-copiar:hover,
.btn-copiar:focus-visible {
    color: var(--bs-primary);
    border-color: var(--bs-primary);
}

.btn-copiar.copiado {
    color: var(--bs-success);
    border-color: var(--bs-success);
}

.bloque-codigo pre {
    margin: 0;
    padding: .9rem 1rem;
    overflow-x: auto;
    font-family: var(--tu-fuente-codigo);
    font-size: .84rem;
    line-height: 1.55;
    background: transparent;
    color: var(--bs-body-color);
}

.bloque-codigo pre:focus-visible {
    outline: 2px solid var(--bs-primary);
    outline-offset: -2px;
}

.bloque-codigo pre code {
    background: none;
    border: 0;
    padding: 0;
    white-space: pre;
    color: inherit;
}

/* ---------- Navegación entre módulos ---------- */

.nav-modulos {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--tu-borde-suave);
}

.nav-modulos a {
    display: block;
    padding: 1rem 1.15rem;
    border: 1px solid var(--tu-borde-suave);
    border-radius: .7rem;
    text-decoration: none;
    color: var(--bs-body-color);
    transition: border-color .15s ease, transform .15s ease;
}

.nav-modulos a:hover,
.nav-modulos a:focus-visible {
    border-color: var(--bs-primary);
    transform: translateY(-2px);
}

.nav-modulos small {
    display: block;
    color: var(--bs-secondary-color);
    font-size: .72rem;
    text-transform: uppercase;
    letter-spacing: .08em;
    margin-bottom: .2rem;
}

.nav-modulos strong { display: block; font-size: .95rem; }

.nav-modulos .siguiente { text-align: right; grid-column: 2; }

/* ---------- Botón volver arriba ---------- */

.btn-arriba {
    position: fixed;
    right: 1.25rem;
    bottom: 1.25rem;
    z-index: 1030;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    border: 0;
    background: var(--bs-primary);
    color: #fff;
    box-shadow: 0 .5rem 1.25rem rgba(0, 0, 0, .25);
    cursor: pointer;
}

/* ---------- Impresión ---------- */

@media print {
    .cabecera, .panel-indice, .barra-progreso, .btn-arriba,
    .btn-copiar, .nav-modulos { display: none !important; }

    .contenido { padding: 0; max-width: none; }
    .bloque-codigo { break-inside: avoid; box-shadow: none; }
    .contenido h1, .contenido h2, .contenido h3 { break-after: avoid; }
}