/* =========================================================================
   Centro de Documentación SUR — styles.css
   Catálogo editorial: papel cálido, serif para los títulos, teal SUR
   reservado para lo accionable. La forma sigue a la función.
   ========================================================================= */

:root {
  --paper:       #FAF8F3;
  --paper-card:  #FFFFFF;
  --ink:         #1A1613;
  --ink-soft:    #6B6358;
  --ink-faint:   #8C857A;
  --line:        #E4DDCF;
  --line-soft:   #EFEAE0;
  --accent:      #007B6E;
  --accent-deep: #005C52;
  --field:       #FFFFFF;

  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans:  "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --shell: 1080px;
  --radius: 3px;

  color-scheme: light;
}

/* ----------------- tema oscuro ----------------- */
/* Elección explícita del usuario (botón), guardada en localStorage. */
html[data-theme="dark"] {
  --paper:       #15130F;
  --paper-card:  #1E1B16;
  --ink:         #F1ECE3;
  --ink-soft:    #B6AFA1;
  --ink-faint:   #8C8577;
  --line:        #34302A;
  --line-soft:   #26221C;
  --accent:      #16A395;
  --accent-deep: #5BDCC9;
  --field:       #201C17;

  color-scheme: dark;
}

/* Sin elección explícita: seguir la preferencia del sistema/navegador. */
@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    --paper:       #15130F;
    --paper-card:  #1E1B16;
    --ink:         #F1ECE3;
    --ink-soft:    #B6AFA1;
    --ink-faint:   #8C8577;
    --line:        #34302A;
    --line-soft:   #26221C;
    --accent:      #16A395;
    --accent-deep: #5BDCC9;
    --field:       #201C17;

    color-scheme: dark;
  }
}

body { transition: background-color .2s ease, color .2s ease; }

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-deep); text-underline-offset: 2px; }
a:hover { color: var(--accent); }

img { max-width: 100%; display: block; }

::selection { background: rgba(0, 123, 110, .16); }

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

.cedoc-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 28px;
}

/* ----------------- skip link (accesibilidad) ----------------- */
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 60;
  background: var(--ink); color: #fff;
  padding: 10px 16px; border-radius: 0 0 var(--radius) 0;
  font-size: .85rem;
}
.skip:focus { left: 0; }

/* ----------------- encabezado ----------------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

/* barra superior teal */
.site-topbar { background: var(--accent); color: #fff; }
.site-topbar__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 34px; padding: 5px 0;
}
.site-topbar__org {
  font-size: .74rem; letter-spacing: .04em; color: rgba(255, 255, 255, .92);
}
.site-topbar__right { display: flex; align-items: center; gap: 18px; }

.site-topbar__social { list-style: none; display: flex; gap: 14px; margin: 0; padding: 0; }
.site-topbar__social a { display: inline-flex; color: #fff; opacity: .82; transition: opacity .15s; }
.site-topbar__social a:hover { opacity: 1; color: #fff; }
.site-topbar__social svg { width: 15px; height: 15px; fill: currentColor; display: block; }

/* ----------------- interruptor de tema (claro / oscuro) ----------------- */
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px;
  background: none; border: 0; padding: 0; margin: 0;
  color: #fff; opacity: .82; cursor: pointer;
  transition: opacity .15s;
}
.theme-toggle:hover { opacity: 1; }
.theme-toggle__icon {
  width: 16px; height: 16px;
  fill: none; stroke: currentColor; stroke-width: 2;
  stroke-linecap: round; stroke-linejoin: round;
  display: none;
}
/* Se muestra el ícono de la acción a la que lleva el clic. */
.theme-toggle__icon--moon { display: block; }
html[data-theme="dark"] .theme-toggle__icon--sun { display: block; }
html[data-theme="dark"] .theme-toggle__icon--moon { display: none; }

@media (prefers-color-scheme: dark) {
  html:not([data-theme]) .theme-toggle__icon--sun { display: block; }
  html:not([data-theme]) .theme-toggle__icon--moon { display: none; }
}

.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; padding: 15px 0;
}
.brand { display: flex; align-items: center; gap: 13px; text-decoration: none; color: var(--ink); }
.brand__mark {
  width: 46px; display: block; flex: none;
  box-shadow: 0 1px 0 rgba(0,0,0,.04);
}
.brand__txt { display: flex; flex-direction: column; line-height: 1.14; }
.brand__name { font-family: var(--serif); font-weight: 600; font-size: 1.18rem; letter-spacing: -.01em; }
.brand__sub {
  font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; color: var(--accent-deep);
  margin-top: 2px;
}

.nav__list { list-style: none; display: flex; gap: 2px; margin: 0; padding: 0; }
.nav__link {
  display: inline-block; text-decoration: none;
  font-size: .88rem; color: var(--ink);
  padding: 9px 13px; border-radius: var(--radius);
  transition: background .15s, color .15s;
}
.nav__link:hover { color: var(--accent-deep); background: rgba(0, 123, 110, .08); }
.nav__link.is-active { color: var(--accent-deep); box-shadow: inset 0 -2px 0 var(--accent); }

.nav__toggle {
  display: none; align-items: center; gap: 9px;
  background: none; border: 1px solid var(--line); color: var(--ink);
  font: inherit; font-size: .82rem;
  padding: 9px 13px; border-radius: var(--radius); cursor: pointer;
}
.nav__bars {
  width: 18px; height: 2px; background: var(--ink); display: inline-block;
  box-shadow: 0 -6px 0 var(--ink), 0 6px 0 var(--ink);
}

/* ----------------- pie (branding · dirección · redes) ----------------- */
.site-footer {
  background: var(--paper);
  border-top: 1px solid var(--line);
  margin-top: 90px;
}
.foot__inner {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 48px; flex-wrap: wrap; padding: 50px 0 30px;
}
.foot__brand { display: flex; align-items: center; gap: 14px; }
.foot__mark { width: 48px; height: 48px; border-radius: 11px; flex: none; }
.foot__name {
  margin: 0; font-family: var(--serif); font-weight: 600;
  font-size: 1.1rem; line-height: 1.25; max-width: 22ch;
}
.foot__contact { display: flex; flex-direction: column; gap: 16px; }
.foot__addr { font-style: normal; color: var(--ink-soft); font-size: .92rem; line-height: 1.65; margin: 0; }

.social { list-style: none; display: flex; gap: 10px; margin: 0; padding: 0; }
.social__link {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px;
  border: 1px solid var(--line); border-radius: 50%;
  color: var(--ink-soft); transition: background .18s, color .18s, border-color .18s;
}
.social__link:hover { color: #fff; background: var(--accent); border-color: var(--accent); }
.social__link svg { width: 18px; height: 18px; fill: currentColor; }

.foot__bottom { border-top: 1px solid var(--line-soft); padding: 16px 0 40px; }
.foot__bottom p { margin: 0; font-size: .8rem; color: var(--ink-faint); }

/* ----------------- estructura de vistas ----------------- */
.cedoc-main { min-height: 60vh; padding-top: 8px; }
.view { display: none; }
.view.is-active { display: block; animation: fade .35s ease both; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* =========================================================================
   VISTA BÚSQUEDA
   ========================================================================= */
.masthead {
  padding: 64px 0 36px;
  display: flex;
  align-items: center;
  gap: 48px;
}
.masthead__texto { max-width: 640px; flex: 1 1 420px; }
.masthead__img {
  flex: 1 1 280px;
  max-width: 340px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--line);
  background: var(--paper-card);
}
.masthead__eyebrow {
  margin: 0 0 18px;
  font-size: .76rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent-deep);
}
.masthead__title {
  font-family: var(--sans);
  font-weight: 600;
  font-size: clamp(1.65rem, 3.2vw, 2.2rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
}
.masthead__lede {
  margin: 0;
  font-size: 1.04rem;
  color: var(--ink-soft);
  max-width: 56ch;
}

/* la ficha de búsqueda: una "ficha de catálogo" */
.ficha {
  position: relative;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 32px 28px;
  margin-bottom: 60px;
}
.ficha__rule {
  position: absolute; top: 0; left: 0;
  height: 3px; width: 84px;
  background: var(--accent);
  border-radius: var(--radius) 0 0 0;
}

.campo { border: 0; margin: 0; padding: 0; }
.campo__label {
  display: block;
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 10px;
}
.campo__label--mt { margin-top: 22px; }

.campo--busca { margin-bottom: 30px; }
.campo__input {
  width: 100%;
  font-family: var(--serif);
  font-size: 1.5rem;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 2px solid var(--ink);
  padding: 6px 2px 12px;
}
.campo__input::placeholder { color: var(--ink-faint); font-style: italic; }
.campo__input:focus { outline: none; border-bottom-color: var(--accent); }

.ficha__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--line-soft);
}

.opt {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: .94rem;
  color: var(--ink);
  padding: 4px 0;
  cursor: pointer;
}
.opt input { accent-color: var(--accent); width: 15px; height: 15px; }

.campo__select {
  width: 100%;
  font-family: var(--sans);
  font-size: .94rem;
  color: var(--ink);
  background: var(--field);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
}
.campo__select:focus { outline: none; border-color: var(--accent); }

.ficha__acciones {
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--line-soft);
}

/* ----------------- botones ----------------- */
.btn {
  font-family: var(--sans);
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: .02em;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  padding: 12px 30px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .18s, color .18s, border-color .18s;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-deep); border-color: var(--accent-deep); }
.btn:disabled { opacity: .55; cursor: default; }

/* =========================================================================
   VISTA RESULTADOS
   ========================================================================= */
.volver {
  appearance: none;
  background: none; border: 0;
  font-family: var(--sans);
  font-size: .82rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent-deep);
  cursor: pointer;
  padding: 36px 0 18px;
}
.volver:hover { color: var(--accent); }

.res__title {
  font-family: var(--sans);
  font-weight: 600;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  letter-spacing: -.01em;
  margin: 0 0 8px;
}
.res__meta { margin: 0 0 24px; color: var(--ink-soft); font-size: .95rem; }
.res__intro {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px 18px;
  margin: 0 0 36px;
  color: var(--ink-soft);
  max-width: 64ch;
}

.grupo { margin-bottom: 52px; }
.grupo__head {
  display: flex; align-items: baseline;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 8px; margin-bottom: 26px;
}
.grupo__tipo {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: .01em;
  margin: 0;
}

.cards {
  list-style: none; margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 34px 40px;
}
.card { display: flex; gap: 18px; }
.card__cover { flex: 0 0 96px; }
.card__img {
  width: 96px; height: 134px;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--line-soft);
}
.card__img--ph {
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  font-size: .66rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--ink-faint);
  padding: 8px;
}
.card__body { min-width: 0; }
.card__titulo {
  font-family: var(--serif);
  font-size: 1.06rem;
  line-height: 1.28;
  color: var(--ink);
  text-decoration: none;
  display: block;
  margin-bottom: 6px;
}
.card__titulo:hover { color: var(--accent-deep); text-decoration: underline; }
.card__autor { margin: 0 0 6px; font-size: .9rem; color: var(--ink-soft); }
.card__meta { margin: 0; font-size: .78rem; letter-spacing: .04em; color: var(--ink-faint); text-transform: uppercase; }
.card__stats { margin: 8px 0 0; font-size: .78rem; color: var(--ink-soft); }
.card__stats::before {
  content: ""; display: inline-block; width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent); margin-right: 7px; vertical-align: middle;
}

.vacio { color: var(--ink-soft); font-style: italic; }

/* ----------------- paginación ----------------- */
.paginacion {
  display: flex; flex-wrap: wrap; gap: 6px;
  justify-content: center;
  margin-top: 24px;
}
.pag__btn {
  min-width: 40px;
  font-family: var(--sans); font-size: .9rem;
  border: 1px solid var(--line);
  background: var(--paper-card);
  color: var(--ink);
  padding: 9px 12px;
  border-radius: var(--radius);
  cursor: pointer;
}
.pag__btn:hover { border-color: var(--accent); color: var(--accent-deep); }
.pag__btn.is-current { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.pag__nav { color: var(--ink-soft); }
.pag__gap { padding: 9px 4px; color: var(--ink-faint); }

/* =========================================================================
   VISTA DETALLE
   ========================================================================= */
.det__titulo {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.5rem, 3.4vw, 2.05rem);
  line-height: 1.12;
  letter-spacing: -.01em;
  margin: 0 0 34px;
  max-width: 24ch;
}
.det__cuerpo { display: grid; grid-template-columns: 220px 1fr; gap: 48px; }
.det__cover {
  border: 1px solid var(--line);
  background: var(--line-soft);
}
.det__cover img { width: 100%; }
.det__ph {
  display: flex; align-items: center; justify-content: center;
  min-height: 280px; padding: 20px; text-align: center;
  font-size: .72rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-faint);
}

.datos { margin: 0; }
.dato {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 18px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}
.dato:first-child { border-top: 1px solid var(--line); }
.dato__k {
  font-size: .74rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-faint); margin: 0; padding-top: 2px;
}
.dato__v { margin: 0; color: var(--ink); }

.enlace-busca {
  appearance: none; background: none; border: 0; padding: 0;
  font: inherit; color: var(--accent-deep);
  cursor: pointer; text-align: left;
  border-bottom: 1px solid transparent;
}
.enlace-busca:hover { color: var(--accent); border-bottom-color: currentColor; }
.enlace-busca--bloque {
  display: block; width: 100%;
  margin-top: 16px; padding: 11px 14px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
}
.enlace-busca--bloque:hover { border-color: var(--accent); color: var(--accent-deep); }

.det__acciones {
  display: flex; align-items: center; gap: 22px; flex-wrap: wrap;
  margin: 28px 0 6px;
}
.det__stats { font-size: .82rem; color: var(--ink-faint); letter-spacing: .03em; }

.aviso {
  color: var(--accent-deep);
  background: rgba(0, 123, 110, .07);
  border-left: 3px solid var(--accent);
  padding: 12px 16px; margin: 22px 0;
  font-size: .92rem;
}
.det__nota { margin: 26px 0; color: var(--ink-soft); }
.det__nota p { margin: 0 0 1em; }

.cita { margin-top: 40px; }
.cita__head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 10px; }
.cita__titulo {
  font-size: .76rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-faint); margin: 0;
}
.cita__copiar {
  display: inline-flex; align-items: center; gap: 7px;
  background: none; border: 1px solid var(--line); color: var(--ink);
  font: inherit; font-size: .8rem; padding: 7px 13px;
  border-radius: var(--radius); cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.cita__copiar:hover { border-color: var(--accent); color: var(--accent-deep); }
.cita__copiar.is-ok { border-color: var(--accent); color: var(--accent-deep); background: rgba(0, 123, 110, .08); }
.cita__copiar svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.cita__rule { height: 1px; background: var(--accent); width: 100%; margin-bottom: 16px; }
.cita__texto { margin: 0; color: var(--ink); font-size: .94rem; }

/* ----------------- loader (espera con SVG animado) ----------------- */
.loader {
  display: flex; flex-direction: column; align-items: center; gap: 16px;
  padding: 72px 0; color: var(--ink-faint);
}
.loader__track { stroke: var(--line); }
.loader__arc { stroke: var(--accent); }
.loader__txt { font-size: .85rem; letter-spacing: .06em; }

/* ----------------- preguntas frecuentes ----------------- */
.faq { list-style: none; counter-reset: faq; margin: 0 0 30px; padding: 0; max-width: 760px; }
.faq__item {
  counter-increment: faq; position: relative;
  padding: 22px 0 22px 56px; border-top: 1px solid var(--line-soft);
}
.faq__item:first-child { border-top: 1px solid var(--line); }
.faq__item::before {
  content: counter(faq); position: absolute; left: 0; top: 21px;
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; background: rgba(0, 123, 110, .1);
  color: var(--accent-deep); font-weight: 600; font-size: .92rem;
}
.faq__item p { margin: 0; color: var(--ink); }
.faq strong { font-weight: 600; }

/* =========================================================================
   RESPONSIVE
   ========================================================================= */
@media (max-width: 820px) {
  .cedoc-shell { padding: 0 20px; }

  .site-header__inner { flex-wrap: wrap; }
  .nav__toggle { display: inline-flex; }
  .nav { order: 3; flex-basis: 100%; }
  .nav__list { display: none; flex-direction: column; gap: 0; padding-top: 6px; }
  .nav.is-open .nav__list { display: flex; }
  .nav__link { display: block; padding: 11px 6px; border-bottom: 1px solid var(--line-soft); }
  .nav__link.is-active { box-shadow: inset 3px 0 0 var(--accent); }

  .foot__inner { flex-direction: column; gap: 28px; padding: 38px 0 22px; }

  .site-topbar__inner { justify-content: center; }
  .site-topbar__org { display: none; }
  .site-topbar__right { gap: 20px; }

  .ficha__grid { grid-template-columns: 1fr; gap: 26px; }
  .masthead { padding: 44px 0 28px; flex-direction: column; gap: 28px; }
  .masthead__img { max-width: 100%; width: 100%; }
  .det__cuerpo { grid-template-columns: 1fr; gap: 28px; }
  .det__cover { max-width: 200px; }
  .dato { grid-template-columns: 1fr; gap: 4px; }
  .dato__k { padding-top: 0; }
}

@media (max-width: 520px) {
  .ficha { padding: 26px 20px 22px; }
  .campo__input { font-size: 1.25rem; }
  .cards { grid-template-columns: 1fr; }
  .card__cover { flex-basis: 80px; }
  .card__img { width: 80px; height: 112px; }
  .btn { width: 100%; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  .view.is-active { animation: none; }
  * { transition: none !important; }
}