/* ===========================================================
   YESHEMIND - Design System compartido de los catalogos publicos
   (Fase 16: Cursos, Libros Digitales, Audiolibros).

   Fuente de verdad visual: extraido del catalogo de Cursos y
   Mentorias ya aprobado, que a su vez toma la paleta y el lenguaje
   "espacial" directamente de la landing real
   (IMPLEMENTACION_CLAUDE/css/main.css: variables --deep/--gold/
   --cyan/--purple y la clase .text-gradient).

   Este archivo es compartido por catalogo-libros.html y
   catalogo-audiolibros.html. catalogo-cursos.html mantiene su copia
   ya aprobada embebida (no se modifica), pero las reglas son
   identicas para que los tres catalogos se vean como una sola
   aplicacion.
   =========================================================== */

:root {
  --deep: #0d1126;
  --deep-soft: #141a3a;
  --deep-line: rgba(255, 255, 255, 0.12);
  --gold: #ffd700;
  --gold-deep: #e0a800;
  --cyan: #00cfff;
  --purple: #8a2be2;
  --azul-claro: #7fb8ff;
  --texto: #eef1fb;
  --texto-tenue: #a7add0;
  --panel: rgba(20, 26, 58, 0.55);
  --borde-oro-tenue: rgba(255, 215, 0, 0.16);
  --shadow-glow-cyan: 0 0 42px rgba(0, 207, 255, 0.22);
  --shadow-glow-gold: 0 12px 34px rgba(255, 215, 0, 0.28);
  --font-title: "Montserrat", "Segoe UI", system-ui, sans-serif;
  --font-body: "Poppins", "Segoe UI", system-ui, sans-serif;
  --t-fast: 160ms cubic-bezier(.4,0,.2,1);
  --t-med: 300ms cubic-bezier(.4,0,.2,1);
}
* { box-sizing: border-box; }
html, body { max-width: 100%; overflow-x: hidden; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--texto);
  background-color: var(--deep);
}
a { color: inherit; }
::selection { background: var(--cyan); color: var(--deep); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

/* Fondo "espacial" de pagina completa: estrellas + nebulosas cian/
   morado via radial-gradient puro (sin imagenes), con un overlay
   oscuro semitransparente encima para conservar el contraste. */
.fondo-espacial {
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(1.6px 1.6px at 6% 12%, #fff, transparent 100%),
    radial-gradient(1.2px 1.2px at 14% 38%, rgba(255,255,255,.85), transparent 100%),
    radial-gradient(1.6px 1.6px at 22% 74%, #fff, transparent 100%),
    radial-gradient(1.2px 1.2px at 31% 20%, rgba(255,255,255,.7), transparent 100%),
    radial-gradient(1.8px 1.8px at 40% 58%, #fff, transparent 100%),
    radial-gradient(1.2px 1.2px at 48% 88%, rgba(255,255,255,.8), transparent 100%),
    radial-gradient(1.6px 1.6px at 57% 30%, #fff, transparent 100%),
    radial-gradient(1.2px 1.2px at 66% 66%, rgba(255,255,255,.75), transparent 100%),
    radial-gradient(1.8px 1.8px at 74% 15%, #fff, transparent 100%),
    radial-gradient(1.2px 1.2px at 83% 47%, rgba(255,255,255,.85), transparent 100%),
    radial-gradient(1.6px 1.6px at 91% 80%, #fff, transparent 100%),
    radial-gradient(1.2px 1.2px at 96% 25%, rgba(255,255,255,.7), transparent 100%),
    radial-gradient(2px 2px at 12% 92%, rgba(0,207,255,.8), transparent 100%),
    radial-gradient(2px 2px at 88% 8%, rgba(255,215,0,.7), transparent 100%),
    radial-gradient(2px 2px at 60% 6%, rgba(138,43,226,.75), transparent 100%),
    radial-gradient(1000px 560px at 12% -8%, rgba(138, 43, 226, 0.32), transparent 60%),
    radial-gradient(900px 520px at 100% 12%, rgba(0, 207, 255, 0.20), transparent 55%),
    radial-gradient(760px 480px at 20% 108%, rgba(138, 43, 226, 0.22), transparent 58%),
    linear-gradient(160deg, #05070f 0%, var(--deep) 55%, var(--deep-soft) 100%);
  background-attachment: fixed;
}
.fondo-overlay {
  position: fixed; inset: 0; z-index: -1;
  background: rgba(5, 7, 15, 0.34);
}

/* -------------------- encabezado -------------------- */
header { padding: 44px 20px 30px; text-align: center; position: relative; }
.marca { display: flex; align-items: center; justify-content: center; gap: 13px; margin-bottom: 20px; }
.marca__halo { position: relative; width: 56px; height: 56px; border-radius: 16px; }
.marca__halo::before {
  content: ""; position: absolute; inset: -10px; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,207,255,.45), rgba(138,43,226,.35) 55%, transparent 75%);
  filter: blur(6px);
  z-index: -1;
}
.marca__halo img {
  width: 56px; height: 56px; border-radius: 16px; object-fit: cover; display: block;
  box-shadow: 0 0 0 1px rgba(255,215,0,.4), 0 10px 26px rgba(0,0,0,.55);
}
.marca span {
  font-family: var(--font-title);
  font-size: 1.02rem; font-weight: 800; letter-spacing: 2.6px;
  color: var(--gold); text-transform: uppercase;
}
header h1 {
  margin: 0 0 12px;
  font-family: var(--font-title);
  font-size: clamp(1.55rem, 4vw, 2.3rem);
  font-weight: 800;
  letter-spacing: .2px;
}
.text-gradient {
  background: linear-gradient(92deg, var(--cyan) 5%, var(--purple) 60%, var(--gold) 110%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
header p.subtitulo {
  margin: 0 auto; max-width: 560px;
  color: var(--texto-tenue); font-size: .98rem; line-height: 1.55;
}
.separador-dorado {
  width: 130px; height: 2px; margin: 24px auto 0;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  box-shadow: 0 0 14px rgba(255,215,0,.55);
}

/* -------------------- buscador -------------------- */
.search-wrap { max-width: 760px; margin: 28px auto 0; padding: 0 20px; }
.search-box {
  display: flex; align-items: center; gap: 12px;
  background: var(--panel);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(0, 207, 255, 0.28);
  border-radius: 16px;
  padding: 15px 20px;
  box-shadow: 0 12px 32px rgba(0,0,0,0.4);
  transition: border-color var(--t-med), box-shadow var(--t-med);
}
.search-box:focus-within {
  border-color: var(--cyan);
  box-shadow: var(--shadow-glow-cyan), 0 12px 32px rgba(0,0,0,0.45);
}
.search-icon { font-size: 1.15rem; color: var(--gold); flex-shrink: 0; }
.search-box input {
  flex: 1; background: transparent; border: none; outline: none;
  color: var(--texto); font-family: var(--font-body); font-size: 1.02rem; padding: 4px 0;
}
.search-box input::placeholder { color: var(--texto-tenue); }
.visually-hidden { position: absolute; left: -9999px; }

.barra-orden { max-width: 760px; margin: 16px auto 0; padding: 0 20px; display: flex; justify-content: flex-end; }
.select-premium {
  appearance: none; -webkit-appearance: none;
  background: var(--deep-soft);
  color: var(--texto);
  font-family: var(--font-body);
  border: 1px solid var(--borde-oro-tenue);
  border-radius: 10px;
  padding: 9px 34px 9px 14px;
  font-size: .84rem;
  cursor: pointer;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--gold) 50%),
    linear-gradient(135deg, var(--gold) 50%, transparent 50%);
  background-position: calc(100% - 18px) center, calc(100% - 13px) center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.select-premium:hover { border-color: var(--purple); }
.select-premium:focus-visible { border-color: var(--cyan); box-shadow: var(--shadow-glow-cyan); outline: none; }
.select-premium option { background: var(--deep-soft); color: var(--texto); }

/* -------------------- listado -------------------- */
main { max-width: 1080px; margin: 24px auto 60px; padding: 0 20px; }

/* Lista compacta (tipo Spotify/Apple Music): una fila por obra,
   titulo + autor apilados a la izquierda y un pequeño icono de
   acceso a la derecha. Toda la fila es el enlace. Reemplaza la
   tabla/tarjeta grande anterior para mostrar muchas mas obras por
   pantalla, sobre todo en movil. */
.lista-catalogo {
  display: flex; flex-direction: column;
  background: var(--panel);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--borde-oro-tenue);
  border-radius: 16px;
  overflow: hidden;
}
.fila-item {
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px;
  padding: 11px 16px;
  color: inherit; text-decoration: none;
  border-bottom: 1px solid var(--borde-oro-tenue);
  transition: background var(--t-fast);
}
.fila-item:last-child { border-bottom: none; }
a.fila-item:hover, a.fila-item:focus-visible { background: rgba(0, 207, 255, 0.07); }

.fila-texto { min-width: 0; flex: 1 1 auto; display: flex; flex-direction: column; gap: 1px; }
.fila-titulo {
  font-family: var(--font-title); font-weight: 650; color: var(--gold); font-size: .95rem;
  line-height: 1.3;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.fila-autor {
  color: var(--cyan); font-size: .8rem; font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.fila-accion {
  flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 50%;
  background: linear-gradient(135deg, var(--gold) 10%, #ffb700 90%);
  color: var(--deep); font-size: .95rem; font-weight: 700; line-height: 1;
  box-shadow: var(--shadow-glow-gold);
  transition: transform var(--t-fast), box-shadow var(--t-fast);
}
a.fila-item:hover .fila-accion { transform: translateX(3px); box-shadow: 0 10px 26px rgba(255,183,0,.45); }

.fila-item.fila-sin-enlace { cursor: default; }

.btn-ver {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, var(--gold) 10%, #ffb700 90%);
  border: none;
  color: var(--deep);
  font-family: var(--font-title);
  font-size: .84rem; font-weight: 700;
  padding: 10px 18px; border-radius: 999px;
  text-decoration: none;
  box-shadow: var(--shadow-glow-gold);
  transition: box-shadow var(--t-fast), transform var(--t-fast), background var(--t-fast);
}
.btn-ver:hover {
  background: linear-gradient(135deg, #ffe14d 10%, var(--gold) 90%);
  box-shadow: 0 16px 40px rgba(255, 183, 0, 0.45);
  transform: translateY(-2px);
}
.btn-ver .flecha { transition: transform var(--t-fast); }
.btn-ver:hover .flecha { transform: translateX(4px); }

.vacio { text-align: center; color: var(--texto-tenue); padding: 54px 20px; font-size: .95rem; }

.paginador { display: flex; justify-content: center; align-items: center; gap: 16px; margin: 30px 0 0; }
.paginador button {
  background: var(--panel); color: var(--texto);
  border: 1px solid var(--borde-oro-tenue); border-radius: 10px;
  padding: 9px 18px; font-size: .85rem; cursor: pointer;
  font-family: var(--font-body);
  transition: border-color var(--t-fast), color var(--t-fast);
}
.paginador button:disabled { opacity: .35; cursor: default; }
.paginador button:not(:disabled):hover { border-color: var(--gold); color: var(--gold); }
.paginador span { color: var(--texto-tenue); font-size: .82rem; }

/* -------------------- lista compacta en movil -------------------- */
/* Densidad alta para ver ~8-12 obras por pantalla: fila mas baja,
   sin la tarjeta/boton grande de antes. Solo afecta a .fila-item
   (lista de catalogo); .btn-ver de la portada mantiene su propio
   estilo movil, sin cambios. */
@media (max-width: 720px) {
  main { margin-top: 16px; }
  .fila-item { padding: 7px 12px; gap: 10px; }
  .fila-texto { gap: 0; }
  .fila-titulo { font-size: .86rem; line-height: 1.2; }
  .fila-autor { font-size: .72rem; line-height: 1.2; }
  .fila-accion { width: 26px; height: 26px; font-size: .85rem; }
  .btn-ver { width: 100%; justify-content: center; padding: 12px 16px; }
}

/* -------------------- agrupacion por autor (preparado, sin activar) --------------------
   Estructura visual reservada para una fase futura: al tocar el
   nombre de un autor se desplegaria la lista de sus obras. Estas
   clases no se generan todavia desde catalogo-app.js (la funcion
   agruparPorAutor existe pero no se llama), por lo que hoy no
   afectan el render actual; quedan listas para cuando se active. */
.grupo-autor { border-bottom: 1px solid var(--borde-oro-tenue); }
.grupo-autor__cabecera {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; padding: 11px 16px; cursor: pointer;
  font-family: var(--font-title); font-weight: 650; color: var(--gold); font-size: .95rem;
}
.grupo-autor__cabecera .chevron { color: var(--cyan); transition: transform var(--t-fast); }
.grupo-autor.abierto .grupo-autor__cabecera .chevron { transform: rotate(180deg); }
.grupo-autor__lista { display: none; }
.grupo-autor.abierto .grupo-autor__lista { display: block; }

footer { text-align: center; color: var(--texto-tenue); font-size: .76rem; padding: 10px 20px 34px; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}