/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --border: #e1e8f0;
  --text: #1a2332;
  --text-muted: #5a6a7e;
  --accent: #3d7ef5;
  --accent-dark: #2560d6;
  --radius: 10px;
  --shadow: 0 2px 12px rgba(0,0,0,.08);

  /* Badge colors */
  --badge-structure: #e8f0fe;
  --badge-structure-text: #1a56db;
  --badge-meta: #fef3c7;
  --badge-meta-text: #92400e;
  --badge-text: #ecfdf5;
  --badge-text-text: #065f46;
  --badge-list: #faf5ff;
  --badge-list-text: #6b21a8;
  --badge-media: #fff7ed;
  --badge-media-text: #9a3412;
  --badge-table: #f0fdf4;
  --badge-table-text: #14532d;
  --badge-form: #fdf2f8;
  --badge-form-text: #831843;
  --badge-semantic: #eff6ff;
  --badge-semantic-text: #1e40af;
  --badge-a11y: #fffbeb;
  --badge-a11y-text: #92400e;
  --badge-layout: #f5f3ff;
  --badge-layout-text: #5b21b6;
}

html { scroll-behavior: smooth; font-size: 15px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ===== UTILITY ===== */
.sr-only { position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0; }

/* ================================================================
   HEADER — documentación (una sola fila, estilo MDN)
   ================================================================ */
header#top {
  background: #0f172a;
  color: white;
  position: sticky;
  top: 0;
  z-index: 300;
  border-bottom: 1px solid rgba(255,255,255,.08);
  box-shadow: 0 2px 20px rgba(0,0,0,.35);
}

/* ── Fila única del header ─────────────────────────────────── */
.header-inner {
  display: flex;
  align-items: stretch;
  padding: 0 20px;
  height: 58px;
  gap: 0;
}

/* ── TOC toggle ────────────────────────────────────────────── */
#toc-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  align-self: stretch;    /* ocupa toda la altura del header → área de clic grande */
  background: transparent;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
  margin-right: 12px;
  border-radius: 0;
  transition: background .15s;
}
#toc-toggle:hover { background: rgba(255,255,255,.08); }

.toc-toggle-icon,
.toc-toggle-icon::before,
.toc-toggle-icon::after {
  display: block;
  width: 16px; height: 1.5px;
  background: rgba(255,255,255,.7);
  border-radius: 2px;
  position: relative;
  transition: transform .2s, opacity .2s;
}
.toc-toggle-icon::before,
.toc-toggle-icon::after { content: ''; position: absolute; left: 0; }
.toc-toggle-icon::before { top: -5px; width: 11px; }
.toc-toggle-icon::after  { top:  5px; width: 13px; }

/* ── Logo / brand ──────────────────────────────────────────── */
.brand-link {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: white;
  flex-shrink: 0;
  margin-right: 8px;
}
.brand-link:hover { opacity: .85; }

.brand-mark {
  font-family: 'SFMono-Regular', 'Consolas', monospace;
  font-size: .78rem;
  background: var(--accent);
  color: white;
  padding: 3px 7px;
  border-radius: 5px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand-name {
  font-size: .98rem;
  font-weight: 700;
  letter-spacing: -.2px;
  white-space: nowrap;
}

/* ── Tabs de navegación ────────────────────────────────────── */
.header-tabs {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-left: 20px;
}

.header-tab {
  display: flex;
  align-items: center;
  padding: 0 18px;
  color: rgba(255,255,255,.5);
  text-decoration: none;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .4px;
  text-transform: uppercase;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s, background .15s;
  white-space: nowrap;
  position: relative;
}
.header-tab:hover {
  color: rgba(255,255,255,.85);
  background: rgba(255,255,255,.05);
}
.header-tab.active {
  color: #7dd3fc;
  border-bottom-color: #3d7ef5;
}

/* ── Lado derecho: contador + buscador ─────────────────────── */
.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
  flex-shrink: 0;
}

/* #tag-counter removed from header */

/* ── Buscador ──────────────────────────────────────────────── */
.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 10px;
  color: rgba(255,255,255,.35);
  pointer-events: none;
  display: flex;
}

#tag-search {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.12);
  color: white;
  border-radius: 7px;
  padding: 7px 32px 7px 32px;
  font-size: .78rem;
  width: 220px;
  outline: none;
  transition: background .2s, border-color .2s, width .25s, box-shadow .2s;
  font-family: inherit;
}
#tag-search::placeholder { color: rgba(255,255,255,.28); }
#tag-search:focus {
  background: rgba(255,255,255,.11);
  border-color: rgba(61,126,245,.7);
  width: 270px;
  box-shadow: 0 0 0 3px rgba(61,126,245,.18);
}

#search-clear {
  position: absolute;
  right: 8px;
  background: rgba(255,255,255,.15);
  border: none;
  color: white;
  border-radius: 50%;
  width: 16px; height: 16px;
  font-size: .6rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .15s;
}
#search-clear:hover { background: rgba(255,255,255,.28); }

/* ── Barra de progreso ─────────────────────────────────────── */
#nav-progress {
  height: 2px;
  background: rgba(255,255,255,.04);
}

/* ── Elementos del HTML antiguo que ya no se usan ──────────── */
.header-brand, .brand-left, .brand-sub, hgroup,
.header-nav-bar, .lang-switcher, .nav-pager,
#main-nav, #nav-toggle, #nav-list,
.hamburger-lines { display: none !important; }

/* ── Landing page: lang-btn (solo en index.html) ───────────── */
.lang-btn {
  display: inline-flex;
  align-items: center;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.14);
  color: rgba(255,255,255,.7);
  font-size: .75rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  transition: all .15s;
  letter-spacing: .3px;
  text-transform: uppercase;
}
.lang-btn:hover { color: #fff; background: rgba(255,255,255,.14); }

/* ── Breadcrumb (en main, no en header) ────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 8px;
  font-size: .78rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  padding: 10px 28px;
  border-bottom: 1px solid var(--border);
  /* Sticky justo debajo del header */
  position: sticky;
  top: 58px;          /* altura del header */
  z-index: 100;
  background: var(--bg);
  /* Extiende el fondo hasta los bordes del main para tapar el contenido que pasa por debajo */
  margin-left: -28px;
  margin-right: -28px;
  margin-top: -32px;
  margin-bottom: 24px;
}
.breadcrumb a {
  color: var(--accent);
  text-decoration: none;
  transition: color .15s;
}
.breadcrumb a:hover { color: var(--accent-dark); text-decoration: underline; }
.breadcrumb-sep { color: var(--border); font-size: 1rem; user-select: none; }
.breadcrumb [aria-current="page"] { color: var(--text); font-weight: 600; }
#nav-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #3d7ef5, #7c3aed);
  width: 0%;
  transition: width .12s linear;
}

/* Search states */
.tag-card.search-match {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(61,126,245,.12);
}
.tag-card.search-hidden { display: none; }
.category.all-hidden > h2,
.category.all-hidden > .category-desc,
.category.all-hidden > .tags-grid { opacity: .2; pointer-events: none; }
/* ── Modo búsqueda: oculta el contenido normal, solo muestra #search-top ── */
body.searching main > *:not(#search-top) {
  display: none !important;
}

/* ── Panel de resultados locales ──────────────────────────────── */
#local-results {
  margin-bottom: 28px;
}
.lr-group {
  margin-bottom: 24px;
}
.lr-group-label {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--text-muted);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.lr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 10px;
}

/* Sin resultados */
.search-no-results {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}
.search-no-results.visible { display: flex; }
.search-no-results svg { opacity: .25; margin-bottom: 4px; }
.search-no-results strong { display: block; font-size: .95rem; color: var(--text); }
.search-no-results span  { font-size: .8rem; }
/* body.searching oculta todo main > * excepto #search-top — ver regla abajo */

/* ── Barra de estado de búsqueda ─────────────────────────────── */
.search-status {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: .75rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.search-status svg { flex-shrink: 0; color: var(--accent); opacity: .6; }
.search-status strong { color: var(--accent-dark); font-weight: 700; }
.ss-sep { margin: 0 4px; opacity: .4; }

/* ── Panel de resultados globales ────────────────────────────── */
.global-results-panel {
  margin-bottom: 36px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.global-panel-heading {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--text-muted);
  background: var(--bg);
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}
.global-panel-heading svg { flex-shrink: 0; opacity: .5; }
.global-result-group {
  border-bottom: 1px solid var(--border);
  padding: 14px 16px;
}
.global-result-group:last-child { border-bottom: none; }
.global-result-group-hd {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.gr-badge {
  font-size: .62rem;
  font-weight: 800;
  letter-spacing: .06em;
  padding: 2px 7px;
  border-radius: 4px;
  text-transform: uppercase;
  flex-shrink: 0;
}
.gr-badge-html { background: #dbeafe; color: #1d4ed8; }
.gr-badge-css  { background: #ede9fe; color: #6d28d9; }
.gr-section-link {
  font-size: .8rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  flex: 1;
}
.gr-section-link:hover { color: var(--accent); }
.gr-section-count {
  font-size: .7rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1px 8px;
  flex-shrink: 0;
}
.gr-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 6px;
}
.gr-card {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 8px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  transition: box-shadow .15s, border-color .15s, transform .15s;
}
.gr-card:hover {
  box-shadow: 0 3px 12px rgba(0,0,0,.09);
  border-color: #93c5fd;
  transform: translateY(-1px);
}
.gr-code {
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .78rem;
  font-weight: 700;
  color: var(--accent-dark);
}
.gr-code mark { background: transparent; color: #2563eb; font-weight: 900; }
.gr-desc {
  font-size: .7rem;
  color: var(--text-muted);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.gr-more {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 7px 12px;
  font-size: .72rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(61,126,245,.05);
  border: 1px dashed rgba(61,126,245,.3);
  border-radius: 8px;
  text-decoration: none;
  transition: background .15s;
}
.gr-more:hover { background: rgba(61,126,245,.1); }

/* ================================================================
   AUTOCOMPLETE DROPDOWN
   ================================================================ */
.search-wrap { position: relative; }

.search-suggestions {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 220px;
  background: #1a2744;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 10px;
  box-shadow: 0 10px 32px rgba(0,0,0,.45);
  z-index: 500;
  overflow: hidden;
  animation: suggestFadeIn .12s ease;
}

@keyframes suggestFadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.search-suggestion {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: .78rem;
  color: rgba(255,255,255,.7);
  cursor: pointer;
  border-bottom: 1px solid rgba(255,255,255,.05);
  transition: background .1s, color .1s;
  white-space: nowrap;
}
.search-suggestion:last-child { border-bottom: none; }

.search-suggestion svg { flex-shrink: 0; opacity: .4; }

.search-suggestion:hover,
.search-suggestion.selected {
  background: rgba(61,126,245,.22);
  color: #fff;
}
.search-suggestion:hover svg,
.search-suggestion.selected svg { opacity: .7; }

.search-suggestion mark {
  background: transparent;
  color: #93c5fd;
  font-weight: 700;
}

/* ================================================================
   PAGE LAYOUT — sidebar + content
   ================================================================ */
.page-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  align-items: start;
  max-width: 1440px;
  margin: 0 auto;
  min-height: calc(100vh - 60px);
  transition: grid-template-columns .25s ease;
}

/* Sidebar colapsado */
.page-layout.sidebar-collapsed {
  grid-template-columns: 0 1fr;
}
.page-layout.sidebar-collapsed #toc-sidebar {
  width: 0;
  height: 0;        /* sin esto, la altura del sidebar infla la fila del grid */
  overflow: hidden;
  visibility: hidden;
  border-right: none;
}
.page-layout.sidebar-collapsed main {
  grid-column: 1 / -1;
}

/* ================================================================
   SIDEBAR TOC
   ================================================================ */
#toc-sidebar {
  position: sticky;
  top: 60px;
  height: calc(100vh - 60px);
  overflow-y: auto;
  min-width: 0;           /* permite que el grid colapse la columna a 0 */
  background: var(--surface);
  border-right: 1px solid var(--border);
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
  transition: width .25s ease, visibility .25s, border-color .25s;
}
#toc-sidebar::-webkit-scrollbar { width: 4px; }
#toc-sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.toc-inner { padding: 16px 0 32px; }

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.toc-title {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

#toc-close {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 24px; height: 24px;
  border-radius: 5px;
  cursor: pointer;
  font-size: .7rem;
  align-items: center;
  justify-content: center;
  transition: background .15s;
}
#toc-close:hover { background: var(--bg); }

.toc-group { margin-bottom: 4px; }

.toc-nav ul { list-style: none; padding: 0; }

.toc-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px 0 20px;
  border-left: 2px solid transparent;
  transition: border-color .15s, background .15s;
}
.toc-item:hover { background: var(--bg); }

/* Activo: cambia a columna para que el submenú quede DEBAJO del título */
.toc-item.toc-active {
  flex-direction: column;
  align-items: stretch;
  border-left-color: var(--accent);
  background: #eff6ff;
  padding: 0;
}
.toc-item.toc-css.toc-active {
  border-left-color: #a855f7;
  background: #faf5ff;
}

/* Fila del título (creada por JS al insertar el submenú) */
.toc-item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px 0 20px;
}

.toc-item a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: .78rem;
  padding: 5px 0;
  display: block;
  flex: 1;
  min-width: 0;
  transition: color .15s;
  line-height: 1.3;
}
.toc-item:hover > a,
.toc-item:hover .toc-item-row a { color: var(--text); }
.toc-item.toc-active .toc-item-row a { color: var(--accent); font-weight: 600; }
.toc-item.toc-css.toc-active .toc-item-row a { color: #a855f7; }

.toc-count {
  font-size: .62rem;
  font-weight: 700;
  color: rgba(0,0,0,.3);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 1px 5px;
  border-radius: 8px;
  flex-shrink: 0;
}
.toc-item.toc-active .toc-count,
.toc-item.toc-active .toc-item-row .toc-count { background: #dbeafe; color: #1d4ed8; border-color: #bfdbfe; }
.toc-count-css { }
.toc-item.toc-css.toc-active .toc-count,
.toc-item.toc-css.toc-active .toc-item-row .toc-count { background: #ede9fe; color: #6d28d9; border-color: #ddd6fe; }

/* ── Submenú de tarjetas dentro de la sección activa ──────── */
.toc-submenu {
  list-style: none;
  padding: 2px 0 10px 0;
  margin: 0;
  background: rgba(0,0,0,.02);
  border-top: 1px solid var(--border);
}

.toc-subitem a {
  display: block;
  position: relative;
  padding: 4px 12px 4px 30px;
  font-size: .73rem;
  font-family: 'SFMono-Regular', 'Consolas', monospace;
  color: var(--text-muted);
  text-decoration: none;
  transition: color .12s, background .12s;
  line-height: 1.4;
  word-break: break-word;
}
.toc-subitem a::before {
  content: '';
  position: absolute;
  left: 17px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px; height: 4px;
  border-radius: 50%;
  background: currentColor;
  opacity: .3;
}
.toc-subitem a:hover {
  color: var(--accent-dark);
  background: rgba(61,126,245,.06);
}
.toc-subitem a:hover::before { opacity: .6; }

.toc-subitem.toc-sub-active a {
  color: var(--accent);
  font-weight: 700;
  background: rgba(61,126,245,.13);
  border-left: 3px solid var(--accent);
  padding-left: 27px; /* 30px - 3px borde */
}
.toc-subitem.toc-sub-active a::before { opacity: 1; }

/* Variante CSS */
.toc-item.toc-css.toc-active .toc-subitem a:hover {
  color: #7c3aed;
  background: rgba(168,85,247,.06);
}
.toc-item.toc-css.toc-active .toc-subitem.toc-sub-active a {
  color: #7c3aed;
  background: rgba(168,85,247,.13);
  border-left-color: #a855f7;
}

/* Overlay */
#toc-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 250;
  backdrop-filter: blur(2px);
}
#toc-overlay.visible { display: block; }

/* ================================================================
   MAIN CONTENT
   ================================================================ */
main {
  min-width: 0;
  padding: 32px 28px 64px;
}

/* main moved to page-layout block above */

/* ===== CATEGORY SECTION ===== */
.category {
  margin-bottom: 56px;
}

.category > h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 12px;
  letter-spacing: -.3px;
}
.category > h2::after {
  content: '';
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, var(--accent) 0%, transparent 100%);
  border-radius: 2px;
  opacity: .35;
}
.category.css-section > h2::after {
  background: linear-gradient(90deg, #a855f7 0%, transparent 100%);
}

.category-desc {
  color: var(--text-muted);
  font-size: .88rem;
  margin-bottom: 22px;
  padding-left: 2px;
}

/* ===== TAGS GRID ===== */
.tags-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

/* ===== TAG CARD ===== */
.tag-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
  transition: transform .18s ease, box-shadow .18s ease, border-top-color .18s;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.tag-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(0,0,0,.11);
  border-top-color: var(--accent);
}

/* Acento top por categoría de badge */
.tag-card:has(.badge-structure):hover { border-top-color: var(--badge-structure-text); }
.tag-card:has(.badge-text):hover      { border-top-color: var(--badge-text-text); }
.tag-card:has(.badge-list):hover      { border-top-color: var(--badge-list-text); }
.tag-card:has(.badge-media):hover     { border-top-color: var(--badge-media-text); }
.tag-card:has(.badge-table):hover     { border-top-color: var(--badge-table-text); }
.tag-card:has(.badge-form):hover      { border-top-color: var(--badge-form-text); }
.tag-card:has(.badge-semantic):hover  { border-top-color: var(--badge-semantic-text); }
.tag-card:has(.badge-a11y):hover      { border-top-color: #b45309; }
.tag-card:has(.badge-css-flex):hover  { border-top-color: #9a3412; }
.tag-card:has(.badge-css-grid):hover  { border-top-color: #14532d; }

.tag-card.wide { grid-column: 1 / -1; }

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.card-header code {
  font-size: .88rem;
  font-weight: 700;
  color: var(--accent-dark);
  background: linear-gradient(135deg, #f0f4ff, #e8f0fe);
  padding: 4px 10px;
  border-radius: 6px;
  font-family: 'SFMono-Regular', 'Consolas', monospace;
  border: 1px solid #dbe6ff;
}

.tag-card > p {
  font-size: .84rem;
  color: var(--text-muted);
  line-height: 1.6;
}
.tag-card > p code {
  background: #f0f4ff;
  color: #2560d6;
  padding: 1px 5px;
  border-radius: 3px;
  font-size: .79rem;
  font-family: 'SFMono-Regular', 'Consolas', monospace;
}

/* ===== DEMO AREA ===== */
.demo {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 14px;
  font-size: .84rem;
  margin-top: auto;
}

.demo pre {
  background: #1e1e2e;
  color: #cdd6f4;
  padding: 12px;
  border-radius: 6px;
  overflow-x: auto;
  font-size: .75rem;
  line-height: 1.5;
  font-family: 'SFMono-Regular', 'Consolas', monospace;
}

.demo code {
  font-family: 'SFMono-Regular', 'Consolas', monospace;
  font-size: .8rem;
}

.demo pre code {
  background: none;
  color: inherit;
  padding: 0;
}

/* ===== BADGES ===== */
.badge {
  font-size: .68rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 20px;
  white-space: nowrap;
  letter-spacing: .3px;
  text-transform: uppercase;
}
.badge-structure { background: var(--badge-structure); color: var(--badge-structure-text); }
.badge-meta      { background: var(--badge-meta);      color: var(--badge-meta-text); }
.badge-text      { background: var(--badge-text);      color: var(--badge-text-text); }
.badge-list      { background: var(--badge-list);      color: var(--badge-list-text); }
.badge-media     { background: var(--badge-media);     color: var(--badge-media-text); }
.badge-table     { background: var(--badge-table);     color: var(--badge-table-text); }
.badge-form      { background: var(--badge-form);      color: var(--badge-form-text); }
.badge-semantic  { background: var(--badge-semantic);  color: var(--badge-semantic-text); }
.badge-a11y      { background: var(--badge-a11y);      color: var(--badge-a11y-text); }
.badge-layout    { background: var(--badge-layout);    color: var(--badge-layout-text); }

/* ===== BUTTON DEMO ===== */
.btn-demo {
  background: var(--accent);
  color: white;
  border: none;
  padding: 7px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: .8rem;
  font-weight: 600;
  transition: background .15s;
}
.btn-demo:hover { background: var(--accent-dark); }

/* ===== TABLES ===== */
.demo table {
  border-collapse: collapse;
  width: 100%;
  font-size: .8rem;
}
.demo table caption {
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-muted);
}
.demo table th, .demo table td {
  border: 1px solid var(--border);
  padding: 6px 10px;
  text-align: left;
}
.demo table th {
  background: #f0f4ff;
  color: var(--accent-dark);
  font-weight: 600;
}
.demo table tfoot td {
  background: #fafafa;
  color: var(--text-muted);
}

/* ===== FORMS ===== */
fieldset {
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 12px 14px;
  margin-bottom: 12px;
}
legend {
  font-size: .78rem;
  font-weight: 700;
  color: var(--accent-dark);
  padding: 0 6px;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.form-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.form-row label {
  font-size: .78rem;
  font-weight: 500;
  color: var(--text-muted);
  min-width: 120px;
}
.form-row small {
  color: #9ca3af;
  font-size: .7rem;
}
.form-row input[type="text"],
.form-row input[type="email"],
.form-row input[type="password"],
.form-row input[type="tel"],
.form-row input[type="number"],
.form-row input[type="date"],
.form-row input[type="time"],
.form-row input[type="datetime-local"],
.form-row input[type="month"],
.form-row input[type="week"],
.form-row input[type="url"],
.form-row input[type="search"],
.form-row select,
.form-row textarea {
  flex: 1;
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: .78rem;
  font-family: inherit;
  min-width: 0;
  background: white;
}
.form-row textarea { min-height: 60px; resize: vertical; }
.form-row output {
  font-weight: 700;
  color: var(--accent);
  font-size: 1rem;
}

.buttons-row {
  gap: 6px;
  flex-wrap: wrap;
}
.buttons-row button,
.buttons-row input[type="submit"],
.buttons-row input[type="image"] {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 5px;
  cursor: pointer;
  font-size: .78rem;
  background: #f8fafc;
}
.buttons-row button[type="submit"],
.buttons-row input[type="submit"] {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  font-weight: 600;
}
.buttons-row button[type="reset"] {
  background: #fef2f2;
  color: #dc2626;
  border-color: #fca5a5;
}

.form-output {
  background: #1e1e2e;
  color: #a6e3a1;
  padding: 12px;
  border-radius: 6px;
  font-family: monospace;
  font-size: .75rem;
  margin-top: 10px;
  white-space: pre-wrap;
  max-height: 200px;
  overflow-y: auto;
}

/* ===== BLOCKQUOTE ===== */
blockquote {
  border-left: 4px solid var(--accent);
  padding-left: 14px;
  color: var(--text-muted);
  font-style: italic;
  font-size: .82rem;
}
blockquote p { margin-bottom: 4px; }
blockquote footer { font-size: .78rem; color: #9ca3af; }

/* ===== DEFINITION LIST ===== */
.demo dl dt {
  font-weight: 600;
  color: var(--text);
  font-size: .82rem;
}
.demo dl dd {
  margin-left: 16px;
  color: var(--text-muted);
  font-size: .8rem;
  margin-bottom: 4px;
  border-left: 2px solid var(--border);
  padding-left: 8px;
}

/* ===== ADDRESS ===== */
address {
  font-style: normal;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--text-muted);
}

/* ===== KBD ===== */
kbd {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  border-bottom: 3px solid #94a3b8;
  border-radius: 4px;
  padding: 2px 6px;
  font-size: .75rem;
  font-family: monospace;
  color: var(--text);
}

/* ===== SEMANTIC DEMO BOXES ===== */
.semantic-demo {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: .72rem;
  font-weight: 600;
  text-align: center;
}
.sem-header {
  background: #3d7ef5;
  color: white;
  padding: 6px;
  border-radius: 4px;
}
.sem-main {
  background: #10b981;
  color: white;
  padding: 10px 6px;
  border-radius: 4px;
}
.sem-footer {
  background: #6b7280;
  color: white;
  padding: 6px;
  border-radius: 4px;
}

/* ===== DIALOG ===== */
dialog {
  border: none;
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 20px 60px rgba(0,0,0,.3);
  max-width: 360px;
  width: 90vw;
}
dialog h3 { margin-bottom: 8px; }
dialog p { font-size: .85rem; color: var(--text-muted); margin-bottom: 14px; }
dialog::backdrop { background: rgba(0,0,0,.5); backdrop-filter: blur(2px); }
dialog button {
  background: var(--accent);
  color: white;
  border: none;
  padding: 8px 18px;
  border-radius: 6px;
  cursor: pointer;
  font-size: .82rem;
}

/* ===== DETAILS / SUMMARY ===== */
details {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 6px;
  overflow: hidden;
}
summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  cursor: pointer;
  font-weight: 600;
  font-size: .82rem;
  user-select: none;
  background: #f0f4ff;
}
summary svg { flex-shrink: 0; color: var(--accent); }
summary:hover { background: #e0eaff; }
details p, details ul {
  padding: 8px 14px;
  font-size: .8rem;
  color: var(--text-muted);
}

/* ===== PROGRESS ===== */
progress {
  -webkit-appearance: none;
  appearance: none;
  width: 140px;
  height: 12px;
  border-radius: 6px;
  overflow: hidden;
  border: none;
  background: #e2e8f0;
}
progress::-webkit-progress-bar { background: #e2e8f0; border-radius: 6px; }
progress::-webkit-progress-value { background: var(--accent); border-radius: 6px; transition: width .3s; }
progress::-moz-progress-bar { background: var(--accent); border-radius: 6px; }

/* ===== METER ===== */
meter {
  width: 120px;
  height: 12px;
}

/* ===== FOCUSABLE DEMO ===== */
.focusable-demo {
  border: 2px solid var(--border);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: .8rem;
  cursor: pointer;
  margin-bottom: 4px;
  transition: border-color .15s;
  outline: none;
}
.focusable-demo:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(61,126,245,.2);
}

/* ===== DRAGGABLE ===== */
.draggable-item {
  background: var(--accent);
  color: white;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: grab;
  font-size: .78rem;
  font-weight: 600;
  user-select: none;
  transition: opacity .15s;
}
.draggable-item:active { cursor: grabbing; opacity: .7; }

/* ===== TEMPLATE CARD ===== */
.template-card {
  background: white;
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 5px;
  font-size: .78rem;
  margin-bottom: 4px;
  animation: slideIn .2s ease;
}
.tc-name { font-weight: 600; color: var(--accent); }
.tc-val { color: var(--text-muted); }

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-10px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ===== ARIA TOGGLE ===== */
button[aria-pressed="true"] {
  background: #10b981;
  color: white;
  border-color: #059669;
}
button[aria-pressed="false"] {
  background: #f1f5f9;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
#aria-toggle {
  padding: 6px 12px;
  border-radius: 5px;
  cursor: pointer;
  font-size: .78rem;
  transition: all .15s;
}

/* ===== DIV DEMO ===== */
#div-demo-area {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  min-height: 20px;
  margin-top: 6px;
}

/* ===== RUBY ===== */
ruby { font-size: 1.2rem; }
rt { font-size: .6rem; color: var(--text-muted); }

/* ===== MARK ===== */
mark {
  background: #fef08a;
  color: #713f12;
  padding: 1px 3px;
  border-radius: 2px;
}

/* ===== INS / DEL ===== */
ins { color: #15803d; background: #dcfce7; padding: 0 2px; border-radius: 2px; text-decoration: none; }
del { color: #dc2626; background: #fef2f2; padding: 0 2px; border-radius: 2px; }

/* ===== SAMP ===== */
samp {
  background: #1e1e2e;
  color: #f38ba8;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: .8rem;
}

/* ===== VAR ===== */
var { font-style: italic; color: #7c3aed; font-weight: 600; }

/* ===== DFN ===== */
dfn { font-style: italic; text-decoration: underline dotted; color: var(--accent-dark); }

/* ===== ABBR ===== */
abbr[title] { text-decoration: underline dotted; cursor: help; }

/* ===== MENU ===== */
.demo menu {
  list-style: none;
  display: flex;
  gap: 6px;
  padding: 0;
}
.demo menu button {
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 5px;
  cursor: pointer;
  font-size: .78rem;
  background: #f8fafc;
  transition: background .15s;
}
.demo menu button:hover { background: #e0eaff; }

/* ===== FOOTER ===== */
#page-footer {
  background: #0f172a;
  color: rgba(255,255,255,.45);
  font-size: .78rem;
  padding: 40px 32px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 32px 24px;
  align-items: start;
  border-top: 1px solid rgba(255,255,255,.07);
}

/* Bloque marca */
.footer-brand-block { display: flex; flex-direction: column; gap: 6px; }
.footer-brand-link {
  display: inline-flex; align-items: center; gap: 8px;
  color: white; text-decoration: none; font-weight: 700; font-size: .9rem;
}
.footer-brand-link .brand-mark {
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .7rem; background: var(--accent);
  color: white; padding: 2px 6px; border-radius: 4px;
}
.footer-brand-link:hover { opacity: .85; }
.footer-brand-block p { font-size: .72rem; color: rgba(255,255,255,.35); margin: 0; }

/* Bloque sección */
.footer-section-block { display: flex; flex-direction: column; gap: 8px; }
.footer-section-block strong { color: rgba(255,255,255,.6); font-size: .75rem; display: block; }
.footer-section-block nav { display: flex; flex-direction: column; gap: 4px; }
.footer-section-block nav a {
  color: rgba(255,255,255,.4); text-decoration: none;
  font-size: .75rem; transition: color .15s;
}
.footer-section-block nav a:hover { color: white; }

/* Bloque portafolio */
.footer-portfolio-block { display: flex; flex-direction: column; gap: 6px; }
.footer-portfolio-block p { margin: 0; font-size: .72rem; color: rgba(255,255,255,.35); }
.footer-portfolio-link {
  display: inline-flex; align-items: center; gap: 5px;
  color: #7dd3fc; text-decoration: none; font-weight: 600; font-size: .82rem;
  transition: color .15s;
}
.footer-portfolio-link:hover { color: white; }
.footer-portfolio-link svg { flex-shrink: 0; opacity: .7; }
.footer-domain {
  display: block; color: rgba(255,255,255,.3);
  font-size: .72rem; text-decoration: none; font-family: 'SFMono-Regular','Consolas',monospace;
  transition: color .15s;
}
.footer-domain:hover { color: rgba(255,255,255,.6); }

/* Franja inferior */
.footer-bottom {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255,255,255,.06);
  padding-top: 16px;
  display: flex;
  justify-content: flex-end;
}
.footer-top-link {
  color: rgba(255,255,255,.3); text-decoration: none;
  font-size: .72rem; transition: color .15s;
}
.footer-top-link:hover { color: rgba(255,255,255,.7); }

@media (max-width: 700px) {
  #page-footer { grid-template-columns: 1fr 1fr; padding: 32px 20px 20px; }
}
@media (max-width: 480px) {
  #page-footer { grid-template-columns: 1fr; }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* Search pulse */
@keyframes pulse-match {
  0%,100% { outline-color: #3d7ef5; }
  50%      { outline-color: #7c3aed; }
}
.tag-card.search-match { animation: pulse-match 1.5s ease infinite; }

/* CSS section tag */
.lang-tag {
  display: inline-flex;
  align-items: center;
  font-family: 'SFMono-Regular', 'Consolas', monospace;
  font-size: .65rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  margin-right: 6px;
  letter-spacing: .5px;
}
.css-tag {
  background: rgba(168,85,247,.2);
  color: #a855f7;
  border: 1px solid rgba(168,85,247,.3);
}
.category.css-section > h2 { border-bottom-color: #a855f7; }

/* CSS badges */
.badge-css-sel     { background: #f5f3ff; color: #5b21b6; }
.badge-css-layout  { background: #eff6ff; color: #1e40af; }
.badge-css-flex    { background: #fff7ed; color: #9a3412; }
.badge-css-grid    { background: #f0fdf4; color: #14532d; }
.badge-css-typo    { background: #ecfdf5; color: #065f46; }
.badge-css-color   { background: #fdf2f8; color: #831843; }
.badge-css-anim    { background: #fff1f2; color: #9f1239; }
.badge-css-var     { background: #fef9c3; color: #713f12; }
.badge-css-pseudo  { background: #f0f9ff; color: #0c4a6e; }
.badge-css-resp    { background: #fef3c7; color: #78350f; }

/* ================================================================
   CSS DEMOS — SELECTORES
   ================================================================ */
.sel-demo {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  font-size: .8rem;
  margin-bottom: 8px;
  min-height: 60px;
}
.sel-demo p, .sel-demo span { padding: 2px 6px; border-radius: 3px; transition: background .3s, outline .3s; }
.sel-demo .css-highlighted { background: #fef08a !important; outline: 2px solid #eab308; }

.sel-controls { display: flex; flex-wrap: wrap; gap: 4px; }

.comb-demo { font-size: .78rem; }
.comb-demo .parent { background: #e8f4f8; padding: 6px; border-radius: 4px; display: inline-block; }

.specificity-chart { display: flex; flex-direction: column; gap: 5px; }
.spec-row { display: flex; align-items: center; gap: 8px; font-size: .75rem; }
.spec-row code { min-width: 90px; font-size: .72rem; }
.spec-bar {
  height: 18px;
  width: var(--w, 0%);
  background: var(--c, #3d7ef5);
  border-radius: 3px;
  display: flex;
  align-items: center;
  padding: 0 6px;
  color: white;
  font-size: .68rem;
  font-weight: 700;
  min-width: 36px;
  transition: width .4s ease;
}

/* ================================================================
   CSS DEMOS — BOX MODEL
   ================================================================ */
.boxmodel-playground { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }
@media (max-width: 700px) { .boxmodel-playground { grid-template-columns: 1fr; } }

.bm-controls { display: flex; flex-direction: column; gap: 8px; font-size: .78rem; }
.bm-controls label { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.bm-controls output { font-weight: 700; color: var(--accent); min-width: 36px; }
.bm-controls select { padding: 3px 6px; border: 1px solid var(--border); border-radius: 4px; font-size: .75rem; }

.bm-visual-wrap { display: flex; flex-direction: column; gap: 8px; }

.bm-margin-box {
  background: #fde68a;
  border-radius: 6px;
  padding: 16px;
  position: relative;
  transition: padding .15s;
}
.bm-border-box {
  background: #fdba74;
  border-radius: 4px;
  padding: 4px;
  border-style: solid;
  border-color: #2c3e50;
  transition: border-width .15s, padding .15s;
}
.bm-padding-box {
  background: #bbf7d0;
  border-radius: 3px;
  padding: 16px;
  position: relative;
  transition: padding .15s;
}
.bm-content-box {
  background: #93c5fd;
  border-radius: 2px;
  padding: 8px;
  text-align: center;
  font-size: .75rem;
  font-weight: 700;
  color: #1e3a5f;
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.bm-label {
  position: absolute;
  top: 2px; left: 4px;
  font-size: .6rem;
  font-weight: 700;
  color: rgba(0,0,0,.5);
  pointer-events: none;
}
.bm-code { font-size: .72rem; background: #1e1e2e; color: #a6e3a1; border-radius: 5px; padding: 8px; }

/* ================================================================
   CSS DEMOS — FLEXBOX PLAYGROUND
   ================================================================ */
.flex-playground { display: flex; flex-direction: column; gap: 12px; }

.fp-controls {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
  font-size: .78rem;
}
.fp-controls label { display: flex; flex-direction: column; gap: 3px; }
.fp-controls select, .fp-controls input[type="range"] { font-size: .75rem; }
.fp-controls output { font-weight: 700; color: var(--accent); }

.fp-container {
  display: flex;
  background: #f0f4ff;
  border: 2px dashed #3d7ef5;
  border-radius: 8px;
  padding: 12px;
  min-height: 100px;
  transition: all .2s;
}

.fp-item {
  background: var(--accent);
  color: white;
  border-radius: 6px;
  padding: 8px 12px;
  font-size: .78rem;
  font-weight: 600;
  text-align: center;
  min-width: 40px;
}
.fp-tall { min-height: 70px; background: #9b59b6; }
.fp-wide { min-width: 100px; background: #2ecc71; }

.fp-code { font-size: .72rem; background: #1e1e2e; color: #cdd6f4; border-radius: 5px; padding: 8px; }

/* ================================================================
   CSS DEMOS — GRID PLAYGROUND
   ================================================================ */
.grid-playground { display: flex; flex-direction: column; gap: 12px; }

.gp-controls {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
  font-size: .78rem;
}
.gp-controls label { display: flex; flex-direction: column; gap: 3px; }
.gp-controls select { font-size: .75rem; padding: 3px 6px; }
.gp-controls output { font-weight: 700; color: var(--accent); }

.gp-container {
  display: grid;
  background: #f0f4ff;
  border: 2px dashed #a855f7;
  border-radius: 8px;
  padding: 10px;
  min-height: 120px;
  transition: all .2s;
}

.gp-item {
  background: #a855f7;
  color: white;
  border-radius: 6px;
  padding: 10px;
  font-size: .75rem;
  font-weight: 700;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 2px;
  min-height: 50px;
}
.gp-special { background: #3d7ef5; }

.gp-code { font-size: .72rem; background: #1e1e2e; color: #cdd6f4; border-radius: 5px; padding: 8px; }

/* ================================================================
   CSS DEMOS — TIPOGRAFÍA PLAYGROUND
   ================================================================ */
.typo-playground { display: flex; flex-direction: column; gap: 12px; }

.tp-controls {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 8px;
  font-size: .78rem;
}
.tp-controls label { display: flex; flex-direction: column; gap: 3px; }
.tp-controls output { font-weight: 700; color: var(--accent); }

.tp-preview {
  background: white;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px;
  min-height: 60px;
  line-height: 1;
  transition: all .15s;
}

.tp-code { font-size: .72rem; background: #1e1e2e; color: #a6e3a1; border-radius: 5px; padding: 8px; }

/* ================================================================
   CSS DEMOS — COLOR PLAYGROUND
   ================================================================ */
.color-playground { display: flex; flex-direction: column; gap: 12px; }
.cp-controls { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; font-size: .8rem; }
.cp-controls label { display: flex; align-items: center; gap: 8px; }
.cp-controls output { font-weight: 700; color: var(--accent); }

.cp-formats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
}
.cp-format-row {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: .73rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.cp-swatch { width: 24px; height: 24px; border-radius: 4px; flex-shrink: 0; border: 1px solid rgba(0,0,0,.1); }
.cp-format-code { font-family: monospace; font-size: .7rem; color: #5a6a7e; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.cp-swatches { display: flex; gap: 6px; flex-wrap: wrap; }
.cp-shade { width: 36px; height: 36px; border-radius: 6px; cursor: pointer; transition: transform .15s; border: 2px solid rgba(255,255,255,.5); box-shadow: var(--shadow); }
.cp-shade:hover { transform: scale(1.15); }

/* ================================================================
   CSS DEMOS — FILTROS
   ================================================================ */
.filter-demos { display: flex; flex-wrap: wrap; gap: 8px; }
.fd-item {
  background: linear-gradient(135deg, #3d7ef5, #a855f7);
  color: white;
  padding: 8px 10px;
  border-radius: 6px;
  font-size: .72rem;
  font-weight: 600;
  text-align: center;
  min-width: 60px;
}

/* ================================================================
   CSS DEMOS — TRANSICIONES
   ================================================================ */
.transition-demos { display: flex; flex-wrap: wrap; gap: 8px; }
.td-box {
  background: var(--tc, #3d7ef5);
  color: white;
  padding: 10px 14px;
  border-radius: 6px;
  font-size: .75rem;
  font-weight: 600;
  cursor: pointer;
}
.td-box:hover { transform: translateY(-4px) scale(1.05); filter: brightness(1.15); }

/* ================================================================
   CSS DEMOS — TRANSFORM
   ================================================================ */
.transform-demos { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; padding: 10px; }
.tr-box {
  background: #a855f722;
  border: 1px solid #a855f7;
  color: #6b21a8;
  padding: 8px 10px;
  border-radius: 6px;
  font-size: .72rem;
  font-weight: 600;
  text-align: center;
}

/* ================================================================
   CSS DEMOS — ANIMACIONES @keyframes
   ================================================================ */
.anim-showcase { display: flex; flex-wrap: wrap; gap: 10px; padding: 10px; }
.anim-item {
  background: linear-gradient(135deg, #3d7ef5, #a855f7);
  color: white;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: .78rem;
  font-weight: 700;
  text-align: center;
  min-width: 64px;
}

@keyframes an-pulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.15); }
}
@keyframes an-bounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-12px); }
}
@keyframes an-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
@keyframes an-shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-6px); }
  40%       { transform: translateX(6px); }
  60%       { transform: translateX(-4px); }
  80%       { transform: translateX(4px); }
}
@keyframes an-float {
  0%, 100% { transform: translateY(0) rotate(-1deg); }
  50%       { transform: translateY(-8px) rotate(1deg); }
}
@keyframes an-flip {
  0%   { transform: perspective(400px) rotateY(0); }
  50%  { transform: perspective(400px) rotateY(180deg); }
  100% { transform: perspective(400px) rotateY(360deg); }
}

.an-pulse { animation: an-pulse 1.5s ease-in-out infinite; }
.an-bounce { animation: an-bounce 1s ease-in-out infinite; }
.an-spin   { animation: an-spin 1.5s linear infinite; }
.an-shake  { animation: an-shake 0.8s ease-in-out infinite; }
.an-float  { animation: an-float 2s ease-in-out infinite; }
.an-flip   { animation: an-flip 2s ease-in-out infinite; }

.anim-paused .anim-item { animation-play-state: paused !important; }

/* ================================================================
   CSS DEMOS — VARIABLES PLAYGROUND
   ================================================================ */
.var-playground { display: flex; flex-direction: column; gap: 12px; }
.vp-controls { display: flex; gap: 14px; flex-wrap: wrap; font-size: .78rem; align-items: center; }
.vp-controls label { display: flex; align-items: center; gap: 6px; }
.vp-controls output { font-weight: 700; color: var(--accent); }

.vp-preview { display: flex; gap: 10px; flex-wrap: wrap; }
.vp-card {
  padding: 12px 16px;
  border-radius: 8px;
  border: 2px solid;
  font-size: .82rem;
  font-weight: 600;
  transition: all .2s;
  color: white;
}
.vp-code { font-size: .72rem; background: #1e1e2e; color: #a6e3a1; border-radius: 5px; padding: 8px; }

/* ================================================================
   CSS DEMOS — PSEUDOS
   ================================================================ */
.pseudo-state-demos { display: flex; flex-wrap: wrap; gap: 8px; font-size: .8rem; }

.psd-link { color: var(--accent); font-weight: 600; padding: 4px 8px; border-radius: 4px; }
.psd-link:hover { background: #e0eaff; }

.psd-btn {
  background: #f1f5f9;
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: .78rem;
  transition: background .15s, transform .1s;
}
.psd-btn:hover { background: #e0eaff; border-color: #3d7ef5; }
.psd-active-demo:active,
.psd-btn.psd-active { background: #3d7ef5 !important; color: white !important; transform: scale(.96); }

.psd-input {
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 6px;
  font-size: .78rem;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.psd-input:focus { border-color: #3d7ef5; box-shadow: 0 0 0 3px rgba(61,126,245,.2); }

#nth-demo { display: flex; flex-direction: column; gap: 3px; }
.nth-item {
  background: #f1f5f9;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 10px;
  font-size: .78rem;
  transition: background .2s, color .2s;
}
.nth-item.nth-active { background: #3d7ef5; color: white; border-color: #3d7ef5; }

/* ::before/::after */
.pseudo-before-after { position: relative; padding: 0 8px; font-size: .85rem; }
.pseudo-before-after::before { content: '«'; color: #3d7ef5; font-weight: 700; margin-right: 4px; }
.pseudo-before-after::after  { content: '»'; color: #3d7ef5; font-weight: 700; margin-left: 4px; }

.pseudo-first-letter::first-letter {
  font-size: 2.2em;
  font-weight: 700;
  color: #a855f7;
  float: left;
  line-height: .85;
  margin-right: 4px;
}

.pseudo-placeholder::placeholder { color: #a855f7; font-style: italic; }
.pseudo-selection::selection { background: #a855f7; color: white; }

/* :focus-within */
.fw-label {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: .78rem;
  transition: border-color .15s, background .15s;
  margin-bottom: 6px;
}
.fw-label:focus-within { border-color: #3d7ef5; background: #f0f4ff; }
.fw-label input { padding: 4px 8px; border: 1px solid var(--border); border-radius: 4px; outline: none; font-size: .78rem; }

/* :checked */
.pseudo-check { accent-color: #a855f7; width: 16px; height: 16px; }
.pseudo-check:checked + span, label:has(.pseudo-check:checked) { color: #a855f7; font-weight: 600; }

/* :valid/:invalid */
.pseudo-form-demo input[type="email"]:valid   { border-color: #10b981; }
.pseudo-form-demo input[type="email"]:invalid:not(:placeholder-shown) { border-color: #e74c3c; }
.pseudo-form-demo input:disabled { opacity: .5; cursor: not-allowed; }

.pseudo-form-demo input {
  display: block;
  width: 100%;
  margin-bottom: 6px;
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: .78rem;
  transition: border-color .15s;
  outline: none;
}

/* ================================================================
   CSS DEMOS — MEDIA QUERY VISUALIZER
   ================================================================ */
.mq-demo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 2px solid;
  margin-bottom: 10px;
  transition: all .3s;
}
.mq-indicator { width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; }

/* Breakpoint colors */
.mq-demo.mq-xs  { border-color: #e74c3c; background: #fef2f2; }
.mq-demo.mq-xs .mq-indicator { background: #e74c3c; }
.mq-demo.mq-sm  { border-color: #f39c12; background: #fff7ed; }
.mq-demo.mq-sm .mq-indicator { background: #f39c12; }
.mq-demo.mq-md  { border-color: #3498db; background: #eff6ff; }
.mq-demo.mq-md .mq-indicator { background: #3498db; }
.mq-demo.mq-lg  { border-color: #2ecc71; background: #f0fdf4; }
.mq-demo.mq-lg .mq-indicator { background: #2ecc71; }
.mq-demo.mq-xl  { border-color: #9b59b6; background: #faf5ff; }
.mq-demo.mq-xl .mq-indicator { background: #9b59b6; }

/* ================================================================
   CSS DEMOS — UNITS TABLE
   ================================================================ */
.units-table { display: flex; flex-direction: column; gap: 4px; }
.ut-row { display: flex; align-items: center; gap: 10px; font-size: .78rem; padding: 4px 6px; border-radius: 4px; }
.ut-row:nth-child(odd) { background: #f8fafc; }
.ut-row code { min-width: 52px; font-size: .72rem; color: #a855f7; }
.ut-row span { color: var(--text-muted); }

/* ================================================================
   RESPONSIVE
   ================================================================ */

/* ---- Tablet: sidebar becomes a drawer ---- */
@media (max-width: 1024px) {
  .page-layout {
    grid-template-columns: 1fr;
  }

  #toc-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    height: 100%;
    z-index: 260;
    transform: translateX(-100%);
    box-shadow: 4px 0 24px rgba(0,0,0,.2);
    background: var(--surface);
    border-right: 1px solid var(--border);
  }

  #toc-sidebar.open {
    transform: translateX(0);
  }

  #toc-close {
    display: flex;
  }

  /* Stick the sidebar top to 0 on mobile since it's fixed */
  #toc-sidebar .toc-inner {
    padding-top: 20px;
  }

  main { padding: 24px 20px 56px; }
}

/* ---- Narrow: collapse nav list behind toggle ---- */
@media (max-width: 768px) {
  .header-brand { padding: 0 14px; height: 48px; }
  .brand-sub { display: none; }
  #tag-search { width: 130px; }
  #tag-search:focus { width: 170px; }

  .header-nav-bar { padding: 0 14px; height: auto; flex-wrap: wrap; gap: 0; }
  .lang-switcher { margin-right: 8px; padding-right: 8px; }

  /* Show hamburger, hide nav list by default */
  #nav-toggle { display: flex; }
  #nav-list { display: none; }
  #nav-list.nav-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: #0f172a;
    border-top: 1px solid rgba(255,255,255,.08);
    padding: 8px 14px 12px;
    z-index: 290;
    box-shadow: 0 8px 24px rgba(0,0,0,.3);
    max-height: 60vh;
    overflow-y: auto;
  }
  #nav-list.nav-open li { width: 100%; }
  #nav-list.nav-open a { padding: 8px 10px; font-size: .8rem; border-radius: 6px; }

  .tags-grid { grid-template-columns: 1fr; }
  .tag-card.wide { grid-column: 1; }
}

/* ---- Small mobile ---- */
@media (max-width: 480px) {
  .header-brand { padding: 0 12px; }
  .header-nav-bar { padding: 0 10px; }
  hgroup h1 { font-size: .95rem; }

  .lang-btn { padding: 3px 8px; font-size: .68rem; }

  main { padding: 16px 12px 48px; }
  .tags-grid { gap: 12px; }
  .tag-card { padding: 14px; }

  .form-row { flex-direction: column; align-items: flex-start; }
  .form-row label { min-width: unset; width: 100%; }
  .form-row input, .form-row select, .form-row textarea { width: 100%; }
  .buttons-row { flex-wrap: wrap; }

  .boxmodel-playground { grid-template-columns: 1fr; }
  .fp-controls, .gp-controls, .tp-controls { grid-template-columns: 1fr; }
}

/* ---- Large screens (1280px+): 2-column cards ---- */
@media (min-width: 1280px) {
  .page-layout {
    max-width: 1800px;
    grid-template-columns: 260px 1fr;
  }

  .tags-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .landing-content {
    max-width: 1400px;
  }
}

/* ---- Extra large screens (1920px+): 3-column cards ---- */
@media (min-width: 1920px) {
  .page-layout {
    max-width: 2400px;
    grid-template-columns: 280px 1fr;
  }

  .tags-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .landing-content {
    max-width: 1600px;
  }

  main {
    padding: 32px 40px 64px;
  }
}

/* ---- Print ---- */
@media print {
  header#top, #toc-sidebar, #toc-overlay, #page-footer { display: none; }
  .page-layout { display: block; }
  main { padding: 0; }
  .tag-card { break-inside: avoid; box-shadow: none; border: 1px solid #ccc; }
}

/* ================================================================
   LANG-BTN AS LINK (html.html / css.html nav)
   ================================================================ */
a.lang-btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

/* ================================================================
   LANDING PAGE
   ================================================================ */
/* ================================================================
   LANDING PAGE — sitio de documentación
   ================================================================ */

.landing-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}

/* ── Header ──────────────────────────────────────────────── */
.landing-header {
  background: #0f172a;
  color: white;
  padding: 0 32px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 300;
  box-shadow: 0 1px 0 rgba(255,255,255,.07), 0 4px 24px rgba(0,0,0,.4);
}
.landing-nav { display: flex; gap: 4px; }
.landing-nav-link {
  color: rgba(255,255,255,.65);
  text-decoration: none;
  font-size: .82rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 6px;
  transition: background .15s, color .15s;
  letter-spacing: .2px;
}
.landing-nav-link:hover { background: rgba(255,255,255,.1); color: white; }
.landing-nav-link.html-link:hover { color: #60a5fa; }
.landing-nav-link.css-link:hover  { color: #c084fc; }

/* ── Hero ────────────────────────────────────────────────── */
.landing-hero {
  background: linear-gradient(160deg, #0f172a 0%, #1e2d45 60%, #0f172a 100%);
  color: white;
  padding: 72px 32px 56px;
  position: relative;
  overflow: hidden;
}
.landing-hero::before {
  content: '</>';
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: 12rem;
  font-weight: 900;
  color: rgba(255,255,255,.03);
  pointer-events: none;
  user-select: none;
  line-height: 1;
}
.landing-hero-inner {
  max-width: 980px;
  margin: 0 auto;
}
.landing-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #60a5fa;
  background: rgba(96,165,250,.12);
  border: 1px solid rgba(96,165,250,.25);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 20px;
}
.landing-hero-title {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.5px;
  margin-bottom: 18px;
}
.landing-accent-html { color: #60a5fa; }
.landing-accent-css  { color: #c084fc; }
.landing-hero-desc {
  font-size: 1rem;
  color: rgba(255,255,255,.65);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: 32px;
}
.landing-hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.landing-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 11px 24px;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform .15s, box-shadow .15s;
}
.landing-cta:hover { transform: translateY(-2px); }
.landing-cta-html {
  background: #3d7ef5;
  color: white;
  box-shadow: 0 4px 16px rgba(61,126,245,.4);
}
.landing-cta-html:hover { box-shadow: 0 8px 24px rgba(61,126,245,.5); }
.landing-cta-css {
  background: rgba(168,85,247,.15);
  color: #c084fc;
  border: 1px solid rgba(168,85,247,.3);
}
.landing-cta-css:hover { background: rgba(168,85,247,.25); }

/* Stats strip */
.landing-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  padding-top: 28px;
  border-top: 1px solid rgba(255,255,255,.08);
}
.landing-stat strong {
  display: block;
  font-size: 1.6rem;
  font-weight: 900;
  color: white;
  line-height: 1;
  margin-bottom: 4px;
}
.landing-stat span {
  font-size: .73rem;
  color: rgba(255,255,255,.45);
  text-transform: uppercase;
  letter-spacing: .05em;
}

/* ── Content ─────────────────────────────────────────────── */
.landing-content {
  flex: 1;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  padding: 48px 32px 72px;
  display: flex;
  flex-direction: column;
  gap: 52px;
}

/* ── Section groups ──────────────────────────────────────── */
.landing-group-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 2px solid;
  margin-bottom: 20px;
}
.landing-group-html { border-bottom-color: #3d7ef5; }
.landing-group-css  { border-bottom-color: #a855f7; }

.landing-group-label {
  display: inline-flex;
  align-items: center;
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .08em;
  padding: 3px 10px;
  border-radius: 5px;
  margin-bottom: 6px;
}
.landing-group-html .landing-group-label { background: #dbeafe; color: #1d4ed8; }
.landing-group-css  .landing-group-label { background: #ede9fe; color: #6d28d9; }

.landing-group-title h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 2px;
}
.landing-group-title p {
  font-size: .82rem;
  color: var(--text-muted);
  margin: 0;
}
.landing-group-intro-link {
  font-size: .8rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid;
  transition: background .15s;
  flex-shrink: 0;
}
.landing-group-html .landing-group-intro-link {
  color: #1d4ed8;
  border-color: #93c5fd;
  background: #f0f7ff;
}
.landing-group-html .landing-group-intro-link:hover { background: #dbeafe; }
.landing-group-css  .landing-group-intro-link {
  color: #6d28d9;
  border-color: #c4b5fd;
  background: #faf5ff;
}
.landing-group-css  .landing-group-intro-link:hover { background: #ede9fe; }

/* ── Section cards grid ──────────────────────────────────── */
.landing-sec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 10px;
}
.landing-sec-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.landing-sec-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,.09);
}
.landing-sec-html:hover { border-color: #93c5fd; }
.landing-sec-css:hover  { border-color: #c4b5fd; }
.landing-sec-html .landing-sec-icon { background: #eff6ff; color: #3d7ef5; }
.landing-sec-css  .landing-sec-icon { background: #f5f3ff; color: #7c3aed; }

.landing-sec-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 7px;
  color: var(--text-muted);
}
.landing-sec-body { flex: 1; min-width: 0; }
.landing-sec-name {
  display: block;
  font-size: .88rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.landing-sec-desc {
  display: block;
  font-size: .73rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.landing-sec-count {
  font-size: .7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 20px;
  flex-shrink: 0;
}
.landing-sec-html .landing-sec-count { background: #dbeafe; color: #1d4ed8; }
.landing-sec-css  .landing-sec-count { background: #ede9fe; color: #6d28d9; }

/* ── Footer ──────────────────────────────────────────────── */
.landing-footer {
  background: #0f172a;
  color: rgba(255,255,255,.35);
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: .78rem;
}
.landing-footer strong { color: rgba(255,255,255,.6); font-weight: 600; }
.landing-footer a { color: rgba(255,255,255,.45); text-decoration: none; }
.landing-footer a:hover { color: white; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 700px) {
  .landing-hero { padding: 48px 20px 40px; }
  .landing-hero-title { font-size: 2rem; }
  .landing-hero::before { display: none; }
  .landing-stats { gap: 20px; }
  .landing-content { padding: 32px 20px 56px; }
  .landing-sec-grid { grid-template-columns: 1fr; }
  .landing-group-header { flex-direction: column; align-items: flex-start; gap: 10px; }
}

/* ================================================================
   PAGINADOR INFERIOR DE SECCIÓN
   ================================================================ */
.section-pager {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 32px 0 8px;
  margin-top: 48px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.pager-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  font-size: .85rem;
  font-weight: 600;
  color: var(--text);
  background: var(--surface);
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
  transition: border-color .15s, box-shadow .15s, color .15s;
}
.pager-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 2px 12px rgba(61,126,245,.12);
}
.pager-btn span { opacity: .6; font-size: 1rem; }
.pager-prev { margin-right: auto; }
.pager-next { margin-left: auto; }

/* ================================================================
   RESPONSIVE DEL HEADER NUEVO
   ================================================================ */
@media (max-width: 900px) {
  .header-tabs { display: none; }
  #tag-search   { width: 160px; }
  #tag-search:focus { width: 200px; }
}

@media (max-width: 600px) {
  .header-inner { padding: 0 12px; }
  .brand-name   { display: none; }
  #tag-search   { width: 130px; }
  #tag-search:focus { width: 170px; }
}

/* ================================================================
   TAG DOCUMENTATION — atributos y callouts
   ================================================================ */

/* Attribute reference grid */
.tag-attrs {
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: 3px 10px;
  font-size: .73rem;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  align-items: baseline;
}
.tag-attrs-header {
  grid-column: 1 / -1;
  font-size: .68rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 5px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--border);
}
.tag-attrs > code {
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .72rem;
  color: var(--accent-dark);
  font-weight: 700;
  white-space: nowrap;
}
.attr-type {
  font-size: .68rem;
  color: #7c3aed;
  font-style: italic;
  white-space: nowrap;
}
.attr-desc {
  color: var(--text-muted);
  line-height: 1.45;
}
.attr-desc code {
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .71rem;
  background: #f0f4ff;
  color: #2560d6;
  padding: 0 3px;
  border-radius: 2px;
}

/* Callout strips */
.tag-tip, .tag-warn, .tag-note {
  font-size: .78rem;
  line-height: 1.55;
  padding: 7px 11px;
  border-radius: 5px;
  border-left: 3px solid;
  margin: 0;
}
.tag-tip  { background: #f0fdf4; border-left-color: #22c55e; color: #166534; }
.tag-warn { background: #fffbeb; border-left-color: #f59e0b; color: #92400e; }
.tag-note { background: #eff6ff; border-left-color: #3b82f6; color: #1e40af; }
.tag-tip code, .tag-warn code, .tag-note code {
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .73rem;
  opacity: .85;
}

/* ================================================================
   HTML WELCOME PAGE — intro, anatomy, pillars, nav-cards
   ================================================================ */

/* ── Intro card sections ─────────────────────────────────── */
.intro-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin-bottom: 18px;
}
.intro-section h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.intro-section h3 .intro-icon {
  display: inline-flex;
  align-items: center;
  vertical-align: middle;
  flex-shrink: 0;
  color: var(--accent);
}
.intro-section > p, .intro-section > ul, .intro-section > ol {
  font-size: .85rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 10px;
}
.intro-section > p:last-child { margin-bottom: 0; }
.intro-section > p code, .intro-section > ul code, .intro-section li code {
  background: #f0f4ff;
  color: #2560d6;
  padding: 1px 5px;
  border-radius: 3px;
  font-size: .8rem;
  font-family: 'SFMono-Regular','Consolas',monospace;
}
.intro-section li { margin-bottom: 4px; }

/* ── Hero ────────────────────────────────────────────────── */
.html-hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1a2942 100%);
  color: white;
  border-radius: var(--radius);
  padding: 36px 32px;
  margin-bottom: 18px;
  position: relative;
  overflow: hidden;
}
.html-hero::before {
  content: '<html>';
  position: absolute;
  top: 16px; right: 24px;
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: 5rem;
  font-weight: 900;
  color: rgba(255,255,255,.04);
  line-height: 1;
  user-select: none;
}
.html-hero h2 {
  font-size: 1.9rem;
  font-weight: 900;
  letter-spacing: -.5px;
  margin-bottom: 10px;
  line-height: 1.2;
}
.html-hero h2 .hero-accent { color: #60a5fa; }
.html-hero > p {
  font-size: .92rem;
  color: rgba(255,255,255,.75);
  max-width: 600px;
  line-height: 1.65;
  margin-bottom: 20px;
}
.html-hero-meta {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.hero-stat {
  display: flex;
  flex-direction: column;
}
.hero-stat strong {
  font-size: 1.4rem;
  font-weight: 800;
  color: #60a5fa;
  line-height: 1;
}
.hero-stat span {
  font-size: .74rem;
  color: rgba(255,255,255,.55);
  margin-top: 2px;
}

/* ── Web pillars ─────────────────────────────────────────── */
.web-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 14px 0;
}
.pillar {
  padding: 14px;
  border-radius: 8px;
  text-align: center;
}
.pillar-html  { background: #dbeafe; border: 1px solid #93c5fd; }
.pillar-css   { background: #ede9fe; border: 1px solid #c4b5fd; }
.pillar-js    { background: #fef9c3; border: 1px solid #fde68a; }
.pillar strong {
  display: block;
  font-size: .9rem;
  font-weight: 800;
  margin-bottom: 4px;
}
.pillar-html strong { color: #1d4ed8; }
.pillar-css  strong { color: #6d28d9; }
.pillar-js   strong { color: #92400e; }
.pillar p {
  font-size: .73rem;
  line-height: 1.4;
  color: #555;
  margin: 0;
}

/* ── Element anatomy diagram ─────────────────────────────── */
.anatomy-wrap {
  overflow-x: auto;
  padding: 8px 0;
}
.anatomy {
  display: inline-flex;
  align-items: flex-start;
  gap: 0;
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .85rem;
  line-height: 2;
  white-space: nowrap;
  user-select: none;
}
.anatomy-part {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}
.anatomy-code {
  padding: 2px 4px;
  border-radius: 3px;
  font-weight: 700;
}
.anatomy-tag   { background: #dbeafe; color: #1d4ed8; }
.anatomy-attr  { background: #ede9fe; color: #6d28d9; }
.anatomy-val   { background: #fef9c3; color: #92400e; }
.anatomy-cont  { background: #dcfce7; color: #166534; }
.anatomy-close { background: #fce7f3; color: #9d174d; }
.anatomy-label {
  font-size: .64rem;
  color: var(--text-muted);
  font-family: inherit;
  margin-top: 4px;
  text-align: center;
  white-space: nowrap;
  font-style: italic;
}
.anatomy-sep {
  color: var(--text-muted);
  padding: 0 1px;
  display: flex;
  align-items: flex-start;
  padding-top: 2px;
  font-weight: 400;
}

/* ── Types table: block/inline/void ─────────────────────── */
.elem-types {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 12px;
}
.elem-type {
  border-radius: 8px;
  padding: 14px;
  border: 1px solid;
}
.elem-type-block  { background: #dbeafe; border-color: #93c5fd; }
.elem-type-inline { background: #fef9c3; border-color: #fde68a; }
.elem-type-void   { background: #fce7f3; border-color: #f9a8d4; }
.elem-type h4 {
  font-size: .8rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.elem-type-block  h4 { color: #1d4ed8; }
.elem-type-inline h4 { color: #92400e; }
.elem-type-void   h4 { color: #9d174d; }
.elem-type p {
  font-size: .72rem;
  color: #555;
  line-height: 1.5;
  margin-bottom: 6px;
}
.elem-type code {
  display: inline-block;
  background: rgba(255,255,255,.7);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: .69rem;
  font-family: 'SFMono-Regular','Consolas',monospace;
  color: #374151;
  margin: 1px;
}

/* ── Section navigation cards ────────────────────────────── */
.html-sections-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  margin-top: 14px;
}
.html-sec-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 14px 16px;
  text-decoration: none;
  color: inherit;
  transition: box-shadow .15s, transform .15s, border-left-color .15s;
}
.html-sec-card:hover {
  box-shadow: 0 4px 20px rgba(61,126,245,.12);
  transform: translateY(-2px);
}
.html-sec-card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .88rem;
  font-weight: 700;
  color: var(--text);
}
.html-sec-card-title svg { flex-shrink: 0; color: var(--accent); }
.html-sec-card-desc {
  font-size: .75rem;
  color: var(--text-muted);
  line-height: 1.5;
}
.html-sec-card-count {
  font-size: .7rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: auto;
}

/* ── Boilerplate code block ──────────────────────────────── */
.boilerplate-block {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 8px;
  padding: 18px 20px;
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .78rem;
  line-height: 1.7;
  overflow-x: auto;
  counter-reset: bp-line;
}
.bp-line {
  display: flex;
  gap: 14px;
}
.bp-line::before {
  counter-increment: bp-line;
  content: counter(bp-line);
  color: #64748b;
  min-width: 18px;
  text-align: right;
  user-select: none;
  flex-shrink: 0;
}
.bp-tag   { color: #7dd3fc; }
.bp-attr  { color: #93c5fd; }
.bp-val   { color: #fde68a; }
.bp-com   { color: #64748b; font-style: italic; }
.bp-text  { color: #86efac; }

/* ── HTML intro responsive ───────────────────────────────── */
@media (max-width: 700px) {
  .web-pillars  { grid-template-columns: 1fr; }
  .elem-types   { grid-template-columns: 1fr; }
  .html-hero h2 { font-size: 1.4rem; }
  .css-hero h2  { font-size: 1.4rem; }
}

/* ================================================================
   CSS WELCOME PAGE — playground, cascade, specificity, units
   ================================================================ */

/* ── CSS Hero (purple) ───────────────────────────────────── */
.css-hero {
  background: linear-gradient(135deg, #1e0a3c 0%, #3b0764 55%, #2d1b69 100%);
  color: white;
  border-radius: var(--radius);
  padding: 36px 32px;
  margin-bottom: 18px;
  position: relative;
  overflow: hidden;
}
.css-hero::before {
  content: '{ }';
  position: absolute;
  top: 10px; right: 24px;
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: 6rem;
  font-weight: 900;
  color: rgba(255,255,255,.04);
  line-height: 1;
  user-select: none;
}
.css-hero h2 {
  font-size: 1.9rem;
  font-weight: 900;
  letter-spacing: -.5px;
  margin-bottom: 10px;
  line-height: 1.2;
}
.css-hero h2 .hero-accent { color: #c084fc; }
.css-hero > p {
  font-size: .92rem;
  color: rgba(255,255,255,.75);
  max-width: 600px;
  line-height: 1.65;
  margin-bottom: 20px;
}
.css-hero .html-hero-meta { display: flex; gap: 24px; flex-wrap: wrap; }
.css-hero .hero-stat strong { color: #c084fc; }
.css-hero .hero-stat span   { color: rgba(255,255,255,.5); font-size: .74rem; }

/* ── Live CSS Playground ─────────────────────────────────── */
.css-live-playground {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-top: 14px;
}
.css-live-pane { display: flex; flex-direction: column; }
.css-live-pane-label {
  font-size: .69rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 7px 14px;
  border-bottom: 1px solid var(--border);
  background: #f8fafc;
  color: var(--text-muted);
}
.css-live-pane:first-child .css-live-pane-label {
  background: #1e1e2e;
  color: #64748b;
  border-bottom-color: #2d2d40;
}
.css-live-textarea {
  width: 100%;
  min-height: 220px;
  background: #1e1e2e;
  color: #cdd6f4;
  border: none;
  padding: 14px;
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .77rem;
  line-height: 1.7;
  resize: vertical;
  outline: none;
  tab-size: 2;
}
.css-live-textarea:focus { background: #16161e; }
.css-live-preview {
  background: #f8fafc;
  padding: 20px;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
}
@media (max-width: 700px) { .css-live-playground { grid-template-columns: 1fr; } }

/* ── Specificity Calculator ──────────────────────────────── */
.spec-calc-wrap { margin: 14px 0; }
.spec-calc-input-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.spec-calc-input {
  flex: 1;
  min-width: 180px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .85rem;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.spec-calc-input:focus { border-color: #a855f7; box-shadow: 0 0 0 3px rgba(168,85,247,.15); }
.spec-boxes-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  flex-wrap: wrap;
}
.spec-box-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.spec-box-val {
  width: 56px; height: 56px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  font-weight: 900;
  transition: all .2s;
  border: 2px solid;
}
.spec-id   .spec-box-val { background: #fce7f3; color: #9d174d; border-color: #f9a8d4; }
.spec-cls  .spec-box-val { background: #fef9c3; color: #713f12; border-color: #fde68a; }
.spec-typ  .spec-box-val { background: #dbeafe; color: #1d4ed8; border-color: #93c5fd; }
.spec-box-label {
  font-size: .63rem;
  color: var(--text-muted);
  text-align: center;
  width: 56px;
  line-height: 1.3;
  font-weight: 600;
}
.spec-sep {
  font-size: 1.5rem;
  color: #cbd5e1;
  align-self: center;
  font-weight: 300;
}
.spec-explanation {
  font-size: .75rem;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 8px 12px;
  margin-top: 10px;
  min-height: 32px;
  line-height: 1.6;
}
.spec-explanation code {
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .73rem;
  background: #f0f4ff;
  color: #2560d6;
  padding: 0 4px;
  border-radius: 2px;
}

/* ── Cascade Layers ──────────────────────────────────────── */
.cascade-layers {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin: 14px 0;
}
.cascade-layer {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 7px;
  font-size: .81rem;
  border: 1px solid transparent;
}
.cascade-layer-num {
  width: 26px; height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: .72rem;
  flex-shrink: 0;
  color: white;
}
.cascade-layer-title { font-weight: 700; min-width: 140px; }
.cascade-layer-desc  { color: var(--text-muted); font-size: .77rem; line-height: 1.4; }
.cascade-l1 { background: #fce7f3; border-color: #f9a8d4; }
.cascade-l1 .cascade-layer-num  { background: #9d174d; }
.cascade-l1 .cascade-layer-title { color: #9d174d; }
.cascade-l2 { background: #ede9fe; border-color: #c4b5fd; }
.cascade-l2 .cascade-layer-num  { background: #7c3aed; }
.cascade-l2 .cascade-layer-title { color: #6d28d9; }
.cascade-l3 { background: #fef9c3; border-color: #fde68a; }
.cascade-l3 .cascade-layer-num  { background: #92400e; }
.cascade-l3 .cascade-layer-title { color: #92400e; }
.cascade-l4 { background: #dcfce7; border-color: #86efac; }
.cascade-l4 .cascade-layer-num  { background: #166534; }
.cascade-l4 .cascade-layer-title { color: #166534; }
.cascade-l5 { background: #dbeafe; border-color: #93c5fd; }
.cascade-l5 .cascade-layer-num  { background: #1d4ed8; }
.cascade-l5 .cascade-layer-title { color: #1d4ed8; }

/* ── CSS Rule anatomy ────────────────────────────────────── */
.rule-anatomy {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .88rem;
  line-height: 1.8;
  margin: 14px 0;
}
.ra-line { display: flex; align-items: center; gap: 0; flex-wrap: wrap; }
.ra-sel    { color: #c084fc; font-weight: 700; }
.ra-brace  { color: #94a3b8; }
.ra-prop   { color: #7dd3fc; margin-left: 20px; }
.ra-colon  { color: #94a3b8; }
.ra-val    { color: #fde68a; margin-left: 6px; }
.ra-semi   { color: #94a3b8; }
.ra-comment { color: #475569; font-style: italic; margin-left: 12px; font-size: .8rem; }
.rule-anatomy-wrap {
  background: #0f172a;
  border-radius: 8px;
  padding: 18px 22px;
}

/* ── Units reference ─────────────────────────────────────── */
.units-grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0;
}
.units-group { font-size: .78rem; }
.units-group-title {
  font-weight: 700;
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: #7c3aed;
  margin-bottom: 6px;
  padding-bottom: 4px;
  border-bottom: 1px solid #e9d5ff;
}
.unit-row {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 6px;
  padding: 4px 0;
  border-bottom: 1px dashed #f1f5f9;
  align-items: baseline;
}
.unit-row code {
  font-family: 'SFMono-Regular','Consolas',monospace;
  font-size: .78rem;
  font-weight: 700;
  color: #7c3aed;
}
.unit-row span { color: var(--text-muted); line-height: 1.4; }
@media (max-width: 700px) { .units-grid-2col { grid-template-columns: 1fr; } }

/* ── CSS section navigation cards ───────────────────────── */
.css-sec-card {
  border-left-color: #a855f7 !important;
}
.css-sec-card:hover {
  box-shadow: 0 4px 20px rgba(168,85,247,.14) !important;
}
.css-sec-card .html-sec-card-count { color: #7c3aed !important; }
.css-sec-card .html-sec-card-title svg { color: #7c3aed; }

/* Sidebar fijo en tablet/móvil */
@media (max-width: 1024px) {
  .page-layout  { grid-template-columns: 1fr; }

  #toc-sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: 280px;
    height: 100%;
    z-index: 260;
    transform: translateX(-100%);
    box-shadow: 4px 0 24px rgba(0,0,0,.2);
    background: var(--surface);
    border-right: 1px solid var(--border);
    transition: transform .25s ease;
  }
  #toc-sidebar.open   { transform: translateX(0); }
  #toc-close          { display: flex; }
  .toc-inner          { padding-top: 20px; }
  main                { padding: 24px 20px 56px; }
}