/* ============================================================
   GrowBooks — Tienda de Ebooks con IA
   Sistema de diseño (inspirado en patrones de e-commerce)
   ============================================================ */
:root {
  --primary:   #0d6efd;
  --ink:       #0f1111;     /* texto principal */
  --ink-soft:  #565959;     /* texto secundario */
  --link:      #007185;     /* enlaces estilo tienda */
  --link-hov:  #c45500;
  --topbar:    #131921;     /* header oscuro */
  --topbar-2:  #232f3e;
  --buy:       #ffd814;     /* botón comprar */
  --buy-hov:   #f7ca00;
  --buy-bd:    #fcd200;
  --read:      #1f8a4c;     /* botón leer (poseído) */
  --read-hov:  #176d3b;
  --price-red: #cc0c39;
  --line:      #e3e6e6;
  --bg-soft:   #f7f8f8;
}

* { box-sizing: border-box; }
body { font-family: 'Segoe UI', 'Helvetica Neue', system-ui, Arial, sans-serif; color: var(--ink); }

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hov); text-decoration: underline; }

/* ---------- Top bar / header ---------- */
.eb-topbar {
  background: var(--topbar);
  padding: .55rem 0;
  box-shadow: 0 1px 0 rgba(0,0,0,.15);
}
.eb-topbar .navbar-brand { color: #fff; font-size: 1.15rem; }
.eb-topbar .nav-link { color: #e6e6e6 !important; font-size: .9rem; white-space: nowrap; }
.eb-topbar .nav-link:hover { color: #fff !important; }
.topbar-search { display: flex; max-width: 620px; }
.topbar-search .form-control {
  border: 0; border-radius: 8px 0 0 8px; height: 40px; box-shadow: none;
}
.topbar-search .form-control:focus { box-shadow: 0 0 0 3px rgba(255,216,20,.6); }
.topbar-search .btn {
  background: var(--buy); border-radius: 0 8px 8px 0; border: 0;
  padding: 0 16px; font-size: 1rem;
}
.topbar-search .btn:hover { background: var(--buy-hov); }
.lang-switch { font-size: .82rem; white-space: nowrap; color: #8a96a3; }
.lang-switch a { color: #c7d0da; text-decoration: none; padding: 0 2px; }
.lang-switch a.on { color: #fff; font-weight: 700; text-decoration: underline; }

/* ---------- Hero ---------- */
.hero-section {
  background: linear-gradient(135deg, #131921 0%, #1a2740 55%, #0f3460 100%);
  color: #fff; padding: 64px 0 72px;
}
.hero-section .badge { font-size: .8rem; padding: .5em 1em; }
.hero-section h1 { font-size: clamp(1.8rem, 4vw, 2.9rem); }
.hero-section .lead { color: #c8d6ea; }
.search-hero { display: flex; max-width: 620px; margin-top: 1.5rem; }
.search-hero .form-control { border: 0; border-radius: 10px 0 0 10px; height: 52px; font-size: 1.05rem; }
.search-hero .btn {
  background: var(--buy); border: 0; border-radius: 0 10px 10px 0;
  font-weight: 700; padding: 0 26px; color: var(--ink);
}
.search-hero .btn:hover { background: var(--buy-hov); }

/* ---------- Botones de la marca ---------- */
.btn-buy {
  background: var(--buy); border: 1px solid var(--buy-bd); color: var(--ink);
  font-weight: 600; border-radius: 999px; box-shadow: 0 2px 5px rgba(213,217,217,.5);
}
.btn-buy:hover { background: var(--buy-hov); border-color: var(--buy-hov); color: var(--ink); }
.btn-read {
  background: var(--read); border: 1px solid var(--read-hov); color: #fff;
  font-weight: 600; border-radius: 999px;
}
.btn-read:hover { background: var(--read-hov); color: #fff; }

/* ---------- Badges ---------- */
.badge-ai   { background: #e7f7ee; color: #1f8a4c; font-weight: 600; }
.badge-best { background: #fde9d0; color: #b25e00; font-weight: 600; }
.badge-soft { background: #eef1f3; color: #565959; font-weight: 500; }

/* ---------- Títulos de sección/bloque ---------- */
.block-title {
  font-size: 1.35rem; font-weight: 700; color: var(--ink);
  padding-bottom: .5rem; margin-bottom: 1.1rem; border-bottom: 1px solid var(--line);
}
.section-h { font-size: 1.05rem; font-weight: 700; margin-bottom: .4rem; }
.section-block { margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }

/* ---------- Tarjetas de catálogo ---------- */
.book-card {
  border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  transition: transform .15s, box-shadow .15s;
}
.book-card:hover { transform: translateY(-4px); box-shadow: 0 10px 26px rgba(0,0,0,.10); }
.book-cover { height: 260px; object-fit: cover; }
.book-cover-placeholder, .book-cover-placeholder-lg { height: 260px; }
.card-title-link {
  font-weight: 700; color: var(--ink); font-size: 1rem; line-height: 1.25;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-title-link:hover { color: var(--link); text-decoration: none; }
.line-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.catalog-price { font-size: 1.15rem; font-weight: 700; color: var(--ink); }
.price-ref { font-size: .78rem; font-weight: 500; color: var(--ink-soft); white-space: nowrap; }

/* ---------- Página de producto ---------- */
.product-page .breadcrumb a { color: var(--link); }
.product-cover-wrap { position: sticky; top: 80px; }
.product-cover { max-height: 440px; box-shadow: 0 8px 30px rgba(0,0,0,.18); border-radius: 8px; }
.product-title { font-size: 1.7rem; font-weight: 700; line-height: 1.25; margin-bottom: .25rem; }
.product-subtitle { font-size: 1.05rem; }
.author-link { color: var(--link); font-weight: 600; }
.product-desc { color: #333; line-height: 1.6; }
.format-chip {
  display: inline-block; background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: 999px; padding: 4px 12px; font-size: .82rem; color: var(--ink-soft);
}
.learn-item { font-size: .92rem; color: #333; padding: 2px 0; }

/* Cajas de formato (estilo selector de Amazon) */
.format-grid { display: flex; gap: 12px; flex-wrap: wrap; }
.format-box {
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; min-width: 150px; background: #fff;
}
.format-box.active { border-color: #007185; box-shadow: 0 0 0 1px #007185 inset; }
.format-box.muted { background: var(--bg-soft); }
.format-name { font-size: .82rem; color: var(--ink-soft); }
.format-price { font-size: 1.05rem; font-weight: 700; }
.fmt-cur { font-size: .75rem; color: var(--ink-soft); font-weight: 500; }
.format-note { font-size: .78rem; }

/* ---------- Caja de compra ---------- */
.buybox {
  border: 1px solid var(--line); border-radius: 12px; padding: 1.1rem 1.2rem;
  position: sticky; top: 80px; background: #fff; box-shadow: 0 2px 10px rgba(0,0,0,.04);
}
.buybox-price { font-size: 1.9rem; font-weight: 700; color: var(--ink); line-height: 1; }
.buybox-cur { font-size: .85rem; color: var(--ink-soft); font-weight: 500; }
.buybox-list { list-style: none; padding: 0; margin: 0 0 1rem; }
.buybox-list li { font-size: .88rem; padding: 3px 0; color: #333; }
.buybox .btn { padding: .55rem; font-size: 1rem; }
.buybox-trust div { padding: 2px 0; }

/* ---------- Comprados juntos ---------- */
.fbt-item img { height: 120px; border-radius: 6px; box-shadow: 0 2px 8px rgba(0,0,0,.12); }
.fbt-price { font-weight: 700; margin-top: 6px; }
.fbt-plus { font-size: 1.8rem; color: var(--ink-soft); }
.fbt-total { padding-left: 1rem; border-left: 1px solid var(--line); margin-left: .5rem; }
.fbt-total-price { font-size: 1.5rem; font-weight: 700; color: var(--price-red); }

/* ---------- Conoce el libro ---------- */
.know-card { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px; padding: 1.1rem 1.3rem; }
.know-label { font-weight: 700; color: var(--primary); margin-bottom: .6rem; }
.prologue-excerpt { line-height: 1.75; white-space: pre-line; color: #333; font-style: italic; }
.prologue-excerpt::first-letter { font-size: 2.2em; font-weight: 700; color: var(--primary); line-height: 1; float: left; padding-right: 6px; }

/* ---------- Carrusel horizontal ---------- */
.hscroll {
  display: flex; gap: 16px; overflow-x: auto; padding: 4px 2px 14px; scroll-snap-type: x mandatory;
}
.hscroll::-webkit-scrollbar { height: 8px; }
.hscroll::-webkit-scrollbar-thumb { background: #c9cdcf; border-radius: 4px; }
.hcard {
  flex: 0 0 160px; scroll-snap-align: start; background: #fff;
  border: 1px solid var(--line); border-radius: 10px; padding: 12px; transition: box-shadow .15s, transform .15s;
}
.hcard:hover { box-shadow: 0 8px 20px rgba(0,0,0,.10); transform: translateY(-3px); text-decoration: none; }
.hcard img { width: 100%; height: 200px; object-fit: cover; border-radius: 6px; }
.hcard-ph { height: 200px; display: flex; align-items: center; justify-content: center; font-size: 3rem; background: var(--bg-soft); border-radius: 6px; }
.hcard-title {
  font-size: .85rem; font-weight: 600; color: var(--ink); margin-top: 8px; line-height: 1.25;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.hcard-price { font-weight: 700; margin-top: 4px; color: var(--ink); }

/* ---------- Estrellas / reseñas ---------- */
.stars { color: #ffa41c; letter-spacing: 1px; white-space: nowrap; }
.stars .star-empty { color: #d5d9d9; }
.stars-lg { font-size: 1.05rem; }
.stars-sm { font-size: .85rem; }
.rating-row { color: var(--link); }
.rating-row:hover { color: var(--link-hov); text-decoration: none; }
.reviews-summary { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px; padding: 1.1rem 1.2rem; text-align: center; }
.rsum-avg { font-size: 2.4rem; font-weight: 700; line-height: 1; }
.review-form { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 1rem 1.1rem; }
.star-input { font-size: 1.6rem; cursor: pointer; color: #d5d9d9; user-select: none; }
.star-input .si-star { transition: color .1s; }
.star-input .si-star.on { color: #ffa41c; }
.review-item { padding: 1rem 0; border-bottom: 1px solid var(--line); }
.review-item:last-child { border-bottom: 0; }
.review-avatar { width: 30px; height: 30px; border-radius: 50%; background: var(--topbar-2); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: .8rem; font-weight: 700; }

/* ---------- FAQ ---------- */
.faq-accordion .accordion-button { font-weight: 600; font-size: .98rem; }
.faq-accordion .accordion-button:not(.collapsed) { background: var(--bg-soft); color: var(--ink); box-shadow: none; }
.faq-accordion .accordion-button:focus { box-shadow: none; border-color: var(--line); }
.faq-accordion .accordion-item { border-color: var(--line); }

/* ---------- Estrellas en tarjetas de catálogo ---------- */
.catalog-rating { font-size: .82rem; }

/* ---------- Referidos ---------- */
.referral-panel { background: linear-gradient(135deg, #f7f8f8, #eef4ff); border: 1px solid var(--line); border-radius: 16px; padding: 1.6rem 1.8rem; }
.ref-link-box { display: flex; gap: 8px; max-width: 560px; }
.ref-link-box .form-control { font-family: monospace; font-size: .9rem; }
.ref-stat { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 1rem; text-align: center; height: 100%; }
.ref-stat-earn { background: #e7f7ee; border-color: #b8e6cc; }
.ref-num { font-size: 1.5rem; font-weight: 700; color: var(--ink); }
.ref-lbl { font-size: .8rem; color: var(--ink-soft); }

/* ---------- Barra de confianza ---------- */
.trust-bar { background: var(--topbar-2); color: #e6edf5; padding: .6rem 0; font-weight: 500; }
.trust-bar span { white-space: nowrap; }

/* ---------- Pestañas de categoría ---------- */
.cat-pills .nav-link { color: var(--ink-soft); border: 1px solid var(--line); background: #fff; font-weight: 600; padding: .4rem 1.1rem; }
.cat-pills .nav-link.active { background: var(--topbar); color: #fff; border-color: var(--topbar); }
.cat-pills .nav-link:hover:not(.active) { border-color: var(--primary); color: var(--primary); }
.cat-see-all { font-size: .9rem; font-weight: 600; color: var(--link); text-decoration: none; white-space: nowrap; }
.cat-see-all:hover { color: var(--link-hov); }

/* ---------- Propuesta de valor ---------- */
.valueprops { background: var(--bg-soft); border-top: 1px solid var(--line); }

/* ---------- Auth / cards genéricas ---------- */
.card { border-radius: 12px; }

/* ---------- Chat / lector ---------- */
.msg-user { word-break: break-word; }
.msg-ai   { word-break: break-word; }

/* ---------- Admin ---------- */
.eb-admin-header { background: var(--topbar); color: #fff; padding: 1rem 1.5rem; }
.stat-card { border-radius: 10px; border: none; }

/* ---------- Footer ---------- */
footer.bg-dark { background: var(--topbar) !important; }

/* ---------- Responsive ---------- */
@media (max-width: 991px) {
  .product-cover-wrap, .buybox { position: static; }
}
@media (max-width: 768px) {
  .hero-section { padding: 44px 0 52px; }
  .fbt-total { border-left: 0; padding-left: 0; margin-left: 0; }
  .product-title { font-size: 1.4rem; }
}