/* ==========================================================
   librosemprendedor.com — sistema de diseño
   Paleta "biblioteca": tinta editorial, papel envejecido, oro de lomo.
   ========================================================== */

:root {
  --ink: #16213E;
  --ink-900: #12182B;
  --ink-950: #0E1526;

  --paper: #F1EFE6;
  --paper-dim: #E8E5D9;

  --text: #1B1B18;
  --text-muted: #63625A;
  --text-inverse: #EDEAE0;

  --gilt: #B08D57;
  --gilt-light: #CBA871;
  --gilt-dark: #8A6D42;

  --radius-sm: 3px;
  --radius: 6px;
  --shadow-card: 0 1px 2px rgba(22,33,62,0.06), 0 6px 20px rgba(22,33,62,0.06);

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}
html.dark body {
  background: var(--ink-900);
  color: var(--text-inverse);
}
h1, h2, h3 { font-family: var(--font-display); margin: 0; }
a { color: inherit; }
img { max-width: 100%; display: block; }
:focus-visible { outline: 2px solid var(--gilt); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

.wrap { max-width: 1152px; margin: 0 auto; padding: 0 16px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(22,33,62,0.1);
}
html.dark .site-header {
  background: color-mix(in srgb, var(--ink-900) 90%, transparent);
  border-bottom-color: rgba(255,255,255,0.1);
}
.header-row { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-family: var(--font-display); font-size: 1.25rem; text-decoration: none; }
.logo .accent { color: var(--gilt); }
.main-nav { display: none; gap: 24px; font-size: 0.9rem; }
.main-nav a { text-decoration: none; color: var(--text-muted); transition: color .15s; }
.main-nav a:hover { color: var(--text); }
html.dark .main-nav a { color: rgba(255,255,255,0.6); }
html.dark .main-nav a:hover { color: #fff; }
@media (min-width: 768px) { .main-nav { display: flex; } }
.header-actions { display: flex; align-items: center; gap: 12px; }
.icon-btn { padding: 8px; border-radius: var(--radius); border: none; background: transparent; cursor: pointer; color: inherit; text-decoration: none; display: inline-flex; }
.icon-btn:hover { background: rgba(22,33,62,0.05); }
html.dark .icon-btn:hover { background: rgba(255,255,255,0.1); }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs { max-width: 1152px; margin: 0 auto; padding: 24px 16px 0; font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-muted); }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 4px; padding: 0; margin: 0; }
.breadcrumbs a { text-decoration: none; }
.breadcrumbs a:hover { text-decoration: underline; }

/* ---------- Spine tag (elemento firma) ---------- */
.spine-tab {
  display: inline-flex; align-items: center; gap: 6px;
  border-radius: var(--radius-sm);
  padding: 5px 10px;
  font-family: var(--font-mono); font-size: 0.72rem;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: #fff; text-decoration: none;
}

/* ---------- Hero ---------- */
.hero { border-bottom: 1px solid rgba(22,33,62,0.1); overflow: hidden; }
html.dark .hero { border-bottom-color: rgba(255,255,255,0.1); }
.hero-inner { padding: 80px 16px 96px; }
.eyebrow { font-family: var(--font-mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gilt-dark); margin-bottom: 16px; }
html.dark .eyebrow { color: var(--gilt-light); }
.hero h1 { font-size: clamp(2.25rem, 5vw, 3.75rem); line-height: 1.05; max-width: 720px; }
.hero h1 .sub { display: block; color: var(--text-muted); }
html.dark .hero h1 .sub { color: rgba(255,255,255,0.5); }
.hero p.lead { max-width: 560px; color: var(--text-muted); margin-top: 24px; }
html.dark .hero p.lead { color: rgba(255,255,255,0.6); }

.search-form { display: flex; gap: 8px; max-width: 520px; margin-top: 32px; }
.search-form input {
  flex: 1; border-radius: var(--radius); border: 1px solid rgba(22,33,62,0.15);
  background: #fff; padding: 12px 16px; font-size: 0.9rem; font-family: var(--font-body);
}
html.dark .search-form input { background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.15); color: #fff; }
.search-form input:focus { border-color: var(--gilt); outline: none; }
.btn {
  border-radius: var(--radius); border: none; padding: 12px 20px;
  font-size: 0.9rem; font-weight: 500; cursor: pointer; text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center;
  transition: opacity .15s;
}
.btn:hover { opacity: 0.9; }
.btn-primary { background: var(--ink); color: #fff; }
html.dark .btn-primary { background: var(--gilt); color: var(--ink); }
.btn-gilt { background: var(--gilt); color: var(--ink); }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 32px; }

/* ---------- Sections ---------- */
section.block { max-width: 1152px; margin: 0 auto; padding: 64px 16px; }
.block-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 24px; }
.block-head h2 { font-size: 1.5rem; }
.block-head a { font-size: 0.9rem; color: var(--gilt-dark); text-decoration: none; }
html.dark .block-head a { color: var(--gilt-light); }
.block-head a:hover { text-decoration: underline; }

/* ---------- Book grid / cards ---------- */
.book-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
@media (min-width: 768px) { .book-grid { grid-template-columns: repeat(4, 1fr); } }

.book-card {
  position: relative; border-radius: var(--radius); overflow: hidden;
  background: rgba(255,255,255,0.6);
  border: 1px solid rgba(22,33,62,0.05);
  box-shadow: var(--shadow-card);
  transition: transform .2s;
  text-decoration: none; color: inherit; display: block;
}
html.dark .book-card { background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.1); }
.book-card:hover { transform: translateY(-2px); }
.book-cover { aspect-ratio: 2/3; width: 100%; overflow: hidden; background: var(--paper-dim); }
html.dark .book-cover { background: var(--ink-950); }
.book-cover img { width: 100%; height: 100%; object-fit: cover; }
.book-card-body { padding: 16px; }
.book-card-body h3 { font-size: 1.05rem; line-height: 1.3; margin-top: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.book-card-body .author { font-size: 0.85rem; color: var(--text-muted); margin-top: 2px; }
html.dark .book-card-body .author { color: rgba(255,255,255,0.5); }
.book-meta-row { display: flex; justify-content: space-between; margin-top: 8px; font-size: 0.72rem; font-family: var(--font-mono); color: var(--text-muted); }
html.dark .book-meta-row { color: rgba(255,255,255,0.4); }

/* ---------- Category cards ---------- */
.category-grid { display: grid; gap: 16px; }
@media (min-width: 640px) { .category-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .category-grid { grid-template-columns: repeat(3, 1fr); } }
.category-card {
  display: flex; gap: 12px; align-items: flex-start;
  border: 1px solid rgba(22,33,62,0.1); border-radius: var(--radius); padding: 16px;
  text-decoration: none; color: inherit; transition: border-color .15s;
}
html.dark .category-card { border-color: rgba(255,255,255,0.1); }
.category-card:hover { border-color: var(--gilt); }
.category-swatch { width: 6px; height: 32px; border-radius: 4px; margin-top: 4px; flex-shrink: 0; }
.category-card h3 { font-size: 1.1rem; }
.category-card p { font-size: 0.85rem; color: var(--text-muted); margin: 4px 0 0; }
html.dark .category-card p { color: rgba(255,255,255,0.5); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { border: 1px solid rgba(22,33,62,0.1); border-radius: var(--radius); padding: 16px; }
html.dark .faq-item { border-color: rgba(255,255,255,0.1); }
.faq-item summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; font-weight: 500; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item p { margin-top: 8px; color: var(--text-muted); font-size: 0.9rem; }
html.dark .faq-item p { color: rgba(255,255,255,0.6); }

/* ---------- CTA / newsletter ---------- */
.cta-box { background: var(--ink); color: #fff; border-radius: var(--radius); padding: 48px 32px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px; }
html.dark .cta-box { background: rgba(255,255,255,0.05); }
.cta-box h2 { font-size: 1.5rem; }
.cta-box p { color: rgba(255,255,255,0.6); font-size: 0.9rem; margin-top: 4px; }
.cta-box form { display: flex; gap: 8px; }
.cta-box input { border-radius: var(--radius); padding: 12px 16px; border: none; font-size: 0.9rem; width: 240px; }

/* ---------- Ad slots ---------- */
.ad-slot {
  min-height: 250px; width: 100%; display: flex; align-items: center; justify-content: center;
  border: 1px dashed rgba(22,33,62,0.2); border-radius: var(--radius);
  background: rgba(22,33,62,0.02);
  font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-muted);
  margin: 32px 0;
}
html.dark .ad-slot { border-color: rgba(255,255,255,0.15); background: rgba(255,255,255,0.02); color: rgba(255,255,255,0.3); }
.ad-slot--sidebar { min-height: 600px; }
.ad-slot--in-feed { min-height: 280px; }

/* ---------- Book detail page ---------- */
.book-detail-head { display: grid; gap: 40px; padding: 24px 16px 40px; max-width: 1152px; margin: 0 auto; border-bottom: 1px solid rgba(22,33,62,0.1); }
html.dark .book-detail-head { border-bottom-color: rgba(255,255,255,0.1); }
@media (min-width: 768px) { .book-detail-head { grid-template-columns: 280px 1fr; } }
.book-detail-cover img { border-radius: var(--radius); box-shadow: var(--shadow-card); }
.buy-btn { display: block; text-align: center; margin-top: 16px; }
.category-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.book-detail-title { font-size: clamp(1.75rem, 4vw, 3rem); line-height: 1.15; }
.book-detail-author { font-size: 1.1rem; color: var(--text-muted); margin-top: 8px; }
html.dark .book-detail-author { color: rgba(255,255,255,0.6); }
.book-detail-author a { text-decoration: underline; }
.book-detail-excerpt { max-width: 640px; color: var(--text-muted); margin-top: 16px; }
html.dark .book-detail-excerpt { color: rgba(255,255,255,0.7); }

.spec-table { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 24px; font-family: var(--font-mono); font-size: 0.85rem; }
@media (min-width: 480px) { .spec-table { grid-template-columns: repeat(3, 1fr); } }
.spec-table dt { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); }
html.dark .spec-table dt { color: rgba(255,255,255,0.4); }
.spec-table dd { margin: 2px 0 0; }

.book-detail-body { display: grid; gap: 48px; max-width: 1152px; margin: 0 auto; padding: 40px 16px; }
@media (min-width: 900px) { .book-detail-body { grid-template-columns: 1fr 300px; } }
.book-detail-body h2 { font-size: 1.5rem; margin-top: 40px; margin-bottom: 12px; }
.book-detail-body h2:first-child { margin-top: 0; }
.book-detail-body ul { padding-left: 0; list-style: none; }
.book-detail-body ul li { display: flex; gap: 8px; margin-bottom: 6px; }
.pros-cons { display: grid; gap: 24px; margin-top: 32px; }
@media (min-width: 640px) { .pros-cons { grid-template-columns: 1fr 1fr; } }
.pros h3 { color: #2F5233; font-size: 1.2rem; }
.cons h3 { color: #8C3B3B; font-size: 1.2rem; }
blockquote.highlight { border-left: 2px solid var(--gilt); padding-left: 16px; font-style: italic; font-size: 1.1rem; font-family: var(--font-display); margin: 16px 0; }

/* ---------- Filters ---------- */
.filter-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 24px; }
.filter-label { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-right: 4px; }
.filter-chip { font-size: 0.78rem; border: 1px solid rgba(22,33,62,0.15); border-radius: var(--radius); padding: 6px 12px; text-decoration: none; color: inherit; }
html.dark .filter-chip { border-color: rgba(255,255,255,0.15); }
.filter-chip:hover, .filter-chip.active { border-color: var(--gilt); }

/* ---------- Footer ---------- */
.site-footer { margin-top: 96px; border-top: 1px solid rgba(22,33,62,0.1); background: rgba(255,255,255,0.4); }
html.dark .site-footer { border-top-color: rgba(255,255,255,0.1); background: rgba(255,255,255,0.02); }
.footer-grid { display: grid; gap: 32px; padding: 48px 16px; font-size: 0.9rem; }
@media (min-width: 768px) { .footer-grid { grid-template-columns: repeat(4, 1fr); } }
.footer-grid .muted { color: var(--text-muted); margin-top: 8px; }
html.dark .footer-grid .muted { color: rgba(255,255,255,0.5); }
.footer-label { font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 12px; }
html.dark .footer-label { color: rgba(255,255,255,0.4); }
.footer-grid ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.footer-grid a { text-decoration: none; }
.footer-grid a:hover { text-decoration: underline; }
.footer-bottom { text-align: center; padding: 16px; font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-muted); border-top: 1px solid rgba(22,33,62,0.1); }
html.dark .footer-bottom { color: rgba(255,255,255,0.3); border-top-color: rgba(255,255,255,0.1); }

/* ---------- Admin panel ---------- */
.admin-body { background: var(--paper); min-height: 100vh; font-family: var(--font-body); color: var(--text); }
.admin-shell { display: flex; min-height: 100vh; }
.admin-sidebar { width: 220px; background: var(--ink); color: #fff; padding: 24px 16px; flex-shrink: 0; }
.admin-sidebar .logo { color: #fff; }
.admin-sidebar nav { margin-top: 32px; display: flex; flex-direction: column; gap: 4px; }
.admin-sidebar a { color: rgba(255,255,255,0.7); text-decoration: none; padding: 8px 12px; border-radius: var(--radius); font-size: 0.9rem; }
.admin-sidebar a:hover, .admin-sidebar a.active { background: rgba(255,255,255,0.1); color: #fff; }
.admin-main { flex: 1; padding: 32px; max-width: 1000px; }
.admin-main h1 { font-size: 1.5rem; margin-bottom: 24px; }
.admin-card { background: #fff; border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-card); margin-bottom: 24px; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.admin-table th, .admin-table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid rgba(22,33,62,0.08); }
.admin-table th { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); }
.admin-table a.action { font-size: 0.82rem; margin-right: 8px; }
.form-grid { display: grid; gap: 16px; }
.form-grid label { display: block; font-size: 0.85rem; font-weight: 500; margin-bottom: 6px; }
.form-grid input[type=text], .form-grid input[type=number], .form-grid input[type=date], .form-grid input[type=url], .form-grid input[type=email], .form-grid input[type=password], .form-grid select, .form-grid textarea {
  width: 100%; border-radius: var(--radius); border: 1px solid rgba(22,33,62,0.15); padding: 10px 12px; font-family: var(--font-body); font-size: 0.9rem;
}
.form-grid textarea { min-height: 90px; }
.form-row-2 { display: grid; gap: 16px; grid-template-columns: 1fr 1fr; }
.checkbox-row { display: flex; align-items: center; gap: 8px; }
.checkbox-row input { width: auto; }
.alert { padding: 12px 16px; border-radius: var(--radius); font-size: 0.9rem; margin-bottom: 16px; }
.alert-error { background: #FBE9E7; color: #8C3B3B; }
.alert-success { background: #E7F3EA; color: #2F5233; }
.login-box { max-width: 360px; margin: 96px auto; padding: 32px; background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-card); }

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.back-to-top { position: fixed; bottom: 24px; right: 24px; background: var(--ink); color: #fff; border-radius: 50%; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; text-decoration: none; box-shadow: var(--shadow-card); opacity: 0; pointer-events: none; transition: opacity .2s; }
.back-to-top.visible { opacity: 1; pointer-events: auto; }