/* ============================================================
   Hikvision LATAM How-To Hub — App styles
   Hikvision Technical Knowledge Hub: editorial, denso, neutro.
   ============================================================ */

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--background);
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
input { background: none; border: none; }
input:focus, button:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--hik-red);
  outline-offset: 2px;
  border-radius: var(--radius-btn);
}
ul { list-style: none; padding: 0; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0; padding: 0; margin: -1px;
}

.wrap {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 3.6vw, 3.5rem);
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: 64px;
  background: var(--background);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--dur-med) var(--ease-out), background-color var(--dur-med) var(--ease-out);
}
.site-header.is-scrolled {
  box-shadow: 0 1px 0 var(--border), 0 6px 16px -12px rgba(23, 23, 22, 0.1);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
}
.site-header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}
.brand-logo { height: 15px; width: auto; display: block; }
.brand-sep { width: 1px; height: 16px; background: var(--border-strong); }
.brand-name {
  font-family: var(--font-bold);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--text);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-right: auto;
}
.header-nav-link {
  padding: 0.5em 0.75em;
  border-radius: var(--radius-btn);
  font-size: var(--fs-small);
  font-family: var(--font-medium);
  color: var(--text-secondary);
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.header-nav-link:hover { background: var(--surface); color: var(--text); }
.header-nav-link.is-active { color: var(--text); font-family: var(--font-bold); }

.site-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}
.header-meta {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.icon-btn {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--background);
  color: var(--text-secondary);
  transition: border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.icon-btn svg { width: 16px; height: 16px; }
.icon-btn:hover { border-color: var(--border-strong); color: var(--text); }
.icon-btn:active { transform: scale(0.94); }

/* ============================================================
   HERO COMPACTO
   ============================================================ */
.hero-compact {
  position: relative;
  padding-block: var(--space-7) var(--space-6);
  background: var(--aura-backdrop);
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.aura-layer { position: absolute; inset: 0; pointer-events: none; }
.aura-layer--dots {
  background-image: radial-gradient(var(--aura-dot) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: radial-gradient(ellipse 60% 100% at 50% 0%, black, transparent 78%);
}
.hero-compact-inner { position: relative; z-index: 1; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
}
.hero-eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 1px;
  background: var(--hik-red);
}
.hero-compact h1 {
  font-family: var(--font-heavy);
  font-size: var(--fs-hero);
  letter-spacing: -0.02em;
  line-height: 1.08;
  color: var(--text);
  margin-top: var(--space-3);
}
.hero-compact h1 .accent { color: var(--hik-red); }
.hero-sub {
  margin: var(--space-3) auto 0;
  max-width: 46ch;
  font-size: clamp(0.95rem, 1.1vw, 1.05rem);
  color: var(--text-secondary);
}

.command-search {
  position: relative;
  width: min(100%, 720px);
  margin: var(--space-6) auto 0;
  text-align: left;
}
.command-search-icon {
  position: absolute;
  left: var(--space-5);
  top: 50%;
  transform: translateY(-50%);
  width: 20px; height: 20px;
  color: var(--text-tertiary);
  pointer-events: none;
}
#command-search-input {
  width: 100%;
  height: 60px;
  background: var(--background);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-input);
  padding: 0 6.5rem 0 3.5rem;
  font-size: 1.0625rem;
  color: var(--text);
  box-shadow: var(--shadow-card);
  transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
#command-search-input::placeholder { color: var(--text-tertiary); }
#command-search-input::-webkit-search-cancel-button,
#command-search-input::-webkit-search-decoration { -webkit-appearance: none; appearance: none; }
#command-search-input:focus { border-color: var(--text); box-shadow: 0 0 0 3px rgba(23, 23, 22, 0.06); }

kbd.search-kbd {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.25em 0.55em;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.command-search.has-query kbd.search-kbd { opacity: 0; pointer-events: none; }

.search-clear {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  place-items: center;
  width: 28px; height: 28px;
  border-radius: 50%;
  color: var(--text-tertiary);
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.search-clear[hidden] { display: none; }
.search-clear svg { width: 15px; height: 15px; }
.search-clear:hover { background: var(--surface); color: var(--text); }

.command-panel {
  position: absolute;
  left: 0; right: 0;
  top: calc(100% + 8px);
  z-index: 45;
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  box-shadow: var(--shadow-pop);
  padding: var(--space-3);
}
.command-panel[hidden] { display: none; }
.command-section-label {
  display: block;
  padding: 0.3em 0.6em;
  font-size: var(--fs-nano);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}
.command-popular-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.3em 0.6em 0.4em;
}
.command-popular-item {
  padding: 0.4em 0.85em;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: var(--fs-small);
  color: var(--text-secondary);
  transition: border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.command-popular-item:hover { border-color: var(--border-strong); color: var(--text); }

.command-result-item {
  display: flex;
  align-items: center;
  gap: 0.7em;
  width: 100%;
  text-align: left;
  padding: 0.55em 0.6em;
  border-radius: var(--radius-btn);
  transition: background-color var(--dur-fast) var(--ease-out);
}
.command-result-item:hover, .command-result-item:focus-visible { background: var(--surface); }
.command-result-icon { flex-shrink: 0; width: 16px; height: 16px; color: var(--text-tertiary); }
.command-result-text { min-width: 0; }
.command-result-title {
  font-size: var(--fs-small);
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.command-result-meta { font-size: var(--fs-nano); color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.03em; }
.command-viewall {
  display: block;
  margin-top: 0.2em;
  padding: 0.6em;
  font-size: var(--fs-small);
  font-family: var(--font-medium);
  color: var(--hik-red-ink);
  border-radius: var(--radius-btn);
  transition: background-color var(--dur-fast) var(--ease-out);
}
.command-viewall:hover { background: var(--hik-red-tint); }

.hero-stats-line {
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.03em;
  color: var(--text-tertiary);
}
.hero-stats-line strong { color: var(--text-secondary); font-family: var(--font-mono); }

/* ============================================================
   FEATURED
   ============================================================ */
.featured { padding-block: var(--space-7) 0; }
.featured[hidden] { display: none; }
.section-heading {
  font-family: var(--font-bold);
  font-size: var(--fs-h2);
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: var(--space-4);
}
.featured-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--grid-gutter);
}
.featured-secondary { 
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--grid-gutter); }

.featured-card {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--background);
  cursor: pointer;
  transition: border-color var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
}
.featured-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-card-hover); transform: translateY(-2px); }
.featured-primary .featured-thumb { aspect-ratio: 16 / 10; }
.featured-secondary .featured-card { flex-direction: row; }
.featured-secondary .featured-thumb { width: 42%; flex-shrink: 0; aspect-ratio: 4 / 3; }
.featured-thumb { position: relative; overflow: hidden; background: var(--surface-secondary); }
.featured-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--dur-slow) var(--ease-out); }
.featured-card:hover .featured-thumb img { transform: scale(1.015); }
.featured-body { padding: var(--space-4); display: flex; flex-direction: column; gap: 0.5em; flex: 1; min-width: 0; }
.featured-primary .featured-body { padding: var(--space-5); }
.featured-badge {
  align-self: flex-start;
  font-family: var(--font-bold);
  font-size: var(--fs-nano);
  letter-spacing: 0.04em;
  padding: 0.3em 0.6em;
  border-radius: var(--radius-btn);
  background: var(--surface);
  color: var(--text-secondary);
}
.featured-category { display: flex; align-items: center; gap: 0.45em; font-size: var(--fs-micro); letter-spacing: 0.03em; text-transform: uppercase; color: var(--text-tertiary); }
.featured-title { font-family: var(--font-medium); font-weight: 600; color: var(--text); line-height: 1.35; }
.featured-primary .featured-title { font-size: 1.25rem; }
.featured-secondary .featured-title { font-size: var(--fs-h3); }
.featured-meta { margin-top: auto; padding-top: 0.4em; font-size: var(--fs-micro); color: var(--text-tertiary); }

/* ============================================================
   KNOWLEDGE EXPLORER
   ============================================================ */
.explorer { padding-block: var(--space-7) var(--space-7); }

.sistemas-trigger {
  display: none;
  align-items: center;
  gap: 0.5em;
  width: 100%;
  padding: 0.7em 1em;
  margin-bottom: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  font-size: var(--fs-small);
  font-family: var(--font-medium);
  color: var(--text);
}
.sistemas-trigger svg { width: 16px; height: 16px; }
.sistemas-trigger #icon-sistemas-chevron { margin-left: auto; color: var(--text-tertiary); }

.explorer-layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  gap: var(--space-7);
  align-items: start;
}

.sistemas-sidebar { position: sticky; top: calc(64px + var(--space-6)); }
.sidebar-label {
  display: block;
  font-family: var(--font-bold);
  font-size: var(--fs-nano);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: var(--space-3);
}
.sistemas-list { display: flex; flex-direction: column; gap: 1px; }
.sistema-item {
  display: flex;
  align-items: center;
  gap: 0.6em;
  width: 100%;
  padding: 0.55em 0.7em 0.55em 0.8em;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-btn) var(--radius-btn) 0;
  font-size: var(--fs-small);
  color: var(--text-secondary);
  text-align: left;
  transition: background-color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.sistema-item:hover { background: var(--surface-hover); }
.sistema-item.is-active { border-left-color: var(--hik-red); color: var(--text); font-family: var(--font-bold); }
.sistema-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--dot, var(--text-tertiary)); flex-shrink: 0; }
.sistema-count { margin-left: auto; font-family: var(--font-mono); font-size: var(--fs-nano); color: var(--text-tertiary); }

.explorer-main { min-width: 0; }
.explorer-toolbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
}
.explorer-toolbar-title h2 {
  font-family: var(--font-bold);
  font-size: var(--fs-h2);
  letter-spacing: -0.01em;
  color: var(--text);
}
.explorer-count { display: block; margin-top: 0.15em; font-size: var(--fs-small); color: var(--text-tertiary); }
.explorer-toolbar-controls { display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap; }

.dropdown { position: relative; }
.dropdown-btn {
  display: flex;
  align-items: center;
  gap: 0.5em;
  height: 34px;
  padding: 0 0.8em;
  border-radius: var(--radius-btn);
  border: 1px solid var(--border);
  background: var(--background);
  color: var(--text-secondary);
  font-size: var(--fs-small);
  font-family: var(--font-medium);
  transition: border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}
.dropdown-btn .chevron { width: 13px; height: 13px; color: var(--text-tertiary); transition: transform var(--dur-fast) var(--ease-out); }
.dropdown:hover .dropdown-btn { border-color: var(--border-strong); }
.dropdown.open .dropdown-btn { border-color: var(--text); color: var(--text); }
.dropdown.open .dropdown-btn .chevron { transform: rotate(180deg); }
.dropdown.has-value .dropdown-btn { color: var(--text); border-color: var(--border-strong); }

.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 40;
  min-width: 190px;
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  box-shadow: var(--shadow-pop);
  padding: 0.3rem;
  max-height: 320px;
  overflow-y: auto;
  opacity: 0;
  transform: translateY(-4px) scale(0.98);
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.dropdown.open .dropdown-menu { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.dropdown-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.5em 0.65em;
  border-radius: var(--radius-btn);
  font-size: var(--fs-small);
  color: var(--text-secondary);
  transition: background-color var(--dur-fast) var(--ease-out);
}
.dropdown-option:hover { background: var(--surface); }
.dropdown-option.active { color: var(--text); font-family: var(--font-bold); }
.dropdown-option svg { width: 14px; height: 14px; color: var(--hik-red); visibility: hidden; }
.dropdown-option.active svg { visibility: visible; }

.explorer-clear { margin-bottom: var(--space-4); }
.explorer-clear[hidden] { display: none; }
.explorer-clear button {
  font-size: var(--fs-small);
  font-family: var(--font-medium);
  color: var(--hik-red-ink);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.explorer-clear button:hover { color: var(--hik-red); }

/* ============================================================
   RESOURCE GRID + CARD
   ============================================================ */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--grid-gutter);
}
.resources-grid[hidden] { display: none; }

.resource-card {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--background);
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  transition: transform var(--dur-slow) var(--ease-out), opacity var(--dur-slow) var(--ease-out),
              border-color var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out);
}
.resource-card.is-visible { opacity: 1; transform: translateY(0); }
.resource-card.is-visible:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card-hover);
}

.card-thumb { position: relative; aspect-ratio: 16 / 10; overflow: hidden; background: var(--surface-secondary); }
.card-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--dur-slow) var(--ease-out); }
.resource-card:hover .card-thumb img { transform: scale(1.015); }

.card-thumb-placeholder {
  position: relative;
  width: 100%; height: 100%;
  background:
    linear-gradient(var(--placeholder-line, var(--border)) 1px, transparent 1px) 0 0 / 100% 34%,
    linear-gradient(90deg, var(--placeholder-line, var(--border)) 1px, transparent 1px) 0 0 / 34% 100%,
    var(--surface-secondary);
}
.card-thumb-placeholder-icon {
  position: absolute;
  bottom: var(--space-3); left: var(--space-3);
  width: 22px; height: 22px;
  color: var(--placeholder-ink, var(--text-tertiary));
  opacity: 0.85;
}
.card-thumb-placeholder-label {
  position: absolute;
  bottom: var(--space-3); right: var(--space-3);
  font-family: var(--font-heavy);
  font-size: 1.6rem;
  letter-spacing: -0.01em;
  color: var(--placeholder-ink, var(--text-tertiary));
  opacity: 0.22;
  text-transform: uppercase;
}

.card-thumb-badge {
  position: absolute;
  top: var(--space-3); left: var(--space-3);
  z-index: 2;
  font-family: var(--font-bold);
  font-size: var(--fs-nano);
  letter-spacing: 0.04em;
  padding: 0.3em 0.6em;
  border-radius: var(--radius-btn);
  background: rgba(255, 255, 255, 0.94);
  color: var(--text-secondary);
}
.card-thumb-lang {
  position: absolute;
  top: var(--space-3); right: var(--space-3);
  z-index: 2;
  font-family: var(--font-mono);
  font-size: var(--fs-nano);
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.94);
  border-radius: var(--radius-btn);
  padding: 0.3em 0.5em;
}

.card-body { padding: var(--space-4); display: flex; flex-direction: column; gap: 0.4em; flex: 1; }
.card-category {
  display: flex;
  align-items: center;
  gap: 0.45em;
  font-family: var(--font-bold);
  font-size: var(--fs-nano);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}
.card-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--dot, var(--text-tertiary)); flex-shrink: 0; }
.card-title-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.5em; }
.card-title {
  font-family: var(--font-medium);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--text);
}
.card-title a {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-title a::after { content: ""; position: absolute; inset: 0; }
.card-arrow {
  flex-shrink: 0;
  width: 15px; height: 15px;
  margin-top: 0.15em;
  color: var(--text-tertiary);
  opacity: 0;
  transform: translate(0, 0);
  transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.resource-card:hover .card-arrow { opacity: 1; transform: translate(2px, -2px); }

.card-meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 0.5em;
  padding-top: var(--space-3);
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
}
.card-platform { display: inline-flex; align-items: center; gap: 0.4em; color: var(--text-secondary); }
.card-platform svg { width: 12px; height: 12px; flex-shrink: 0; }
.card-meta time { font-family: var(--font-mono); color: var(--text-tertiary); }
.card-meta .dot-sep { color: var(--border-strong); }

/* ---- Empty state ---- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-block: var(--space-8);
  color: var(--text-secondary);
}
.empty-state[hidden] { display: none; }
.empty-state svg { width: 40px; height: 40px; color: var(--text-tertiary); margin-bottom: var(--space-4); }
.empty-state h3 { font-family: var(--font-bold); font-size: var(--fs-h3); color: var(--text); margin-bottom: 0.3em; }
.empty-state button {
  margin-top: var(--space-4);
  font-family: var(--font-bold);
  font-size: var(--fs-small);
  color: #fff;
  background: var(--text);
  padding: 0.6em 1.2em;
  border-radius: var(--radius-btn);
  transition: background-color var(--dur-fast) var(--ease-out);
}
.empty-state button:hover { background: var(--hik-red); }

/* ---- Skeleton ---- */
.skeleton-card { border: 1px solid var(--border); border-radius: var(--radius-card); overflow: hidden; }
.skeleton-media { aspect-ratio: 16/10; }
.skeleton-line { height: 11px; border-radius: 4px; margin: var(--space-4) var(--space-4) 0; }
.skeleton-line.short { width: 40%; margin-top: var(--space-3); margin-bottom: var(--space-4); }
.skeleton-media, .skeleton-line {
  background: linear-gradient(100deg, var(--surface) 30%, var(--border) 50%, var(--surface) 70%);
  background-size: 200% 100%;
  animation: shimmer 1.6s ease-in-out infinite;
}
@keyframes shimmer {
  0% { background-position: 140% 0; }
  100% { background-position: -40% 0; }
}

/* ============================================================
   TEXTO DESCRIPTIVO (GEO) — discreto, bajo el explorador
   ============================================================ */
.seo-note {
  padding-block: var(--space-6);
  border-top: 1px solid var(--border);
  color: var(--text-tertiary);
  font-size: var(--fs-micro);
  line-height: 1.7;
}
.seo-note p { max-width: 90ch; }
.seo-note strong { color: var(--text-secondary); font-weight: 600; }

/* ============================================================
   SHEET MOBILE — filtro de sistemas
   ============================================================ */
.sheet-overlay {
  position: fixed; inset: 0;
  z-index: 60;
  background: rgba(23, 23, 22, 0.36);
  opacity: 0;
  transition: opacity var(--dur-med) var(--ease-out);
}
.sheet-overlay[hidden] { display: none; }
.sheet-overlay.is-open { opacity: 1; }

.sheet-panel {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 61;
  max-height: 75vh;
  background: var(--background);
  border-radius: 16px 16px 0 0;
  box-shadow: var(--shadow-pop);
  padding: var(--space-4) var(--space-4) var(--space-6);
  overflow-y: auto;
  transform: translateY(100%);
  transition: transform var(--dur-med) var(--ease-out);
}
.sheet-panel[hidden] { display: none; }
.sheet-panel.is-open { transform: translateY(0); }
.sheet-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-bold);
  font-size: var(--fs-small);
  color: var(--text);
  margin-bottom: var(--space-3);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); }
.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-6);
}
.footer-brand { max-width: 30ch; }
.footer-brand .brand { margin-bottom: var(--space-2); }
.footer-brand p { font-size: var(--fs-small); color: var(--text-secondary); line-height: 1.6; }
.footer-links { display: flex; gap: var(--space-7); }
.footer-col h4 {
  font-family: var(--font-bold);
  font-size: var(--fs-nano);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: var(--space-3);
}
.footer-col ul { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col a, .footer-col span { font-size: var(--fs-small); color: var(--text-secondary); transition: color var(--dur-fast) var(--ease-out); }
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--space-2);
  padding-block: var(--space-3);
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: var(--fs-nano);
  color: var(--text-tertiary);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1180px) {
  .header-nav { display: none; }
  .sistemas-sidebar { display: none; }
  .sistemas-trigger { display: flex; }
  .explorer-layout { grid-template-columns: 1fr; }
  .resources-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .featured-grid { grid-template-columns: 1fr; }
  .featured-secondary { flex-direction: row; }
  .featured-secondary .featured-card { flex-direction: column; }
  .featured-secondary .featured-thumb { width: 100%; aspect-ratio: 16/10; }
}

@media (max-width: 720px) {
  .site-header { height: 56px; }
  .header-meta { display: none; }
  .brand-name { display: none; }
  .hero-compact { padding-block: var(--space-6) var(--space-5); }
  .hero-compact h1 { font-size: clamp(1.75rem, 8vw, 2.25rem); }
  .command-search { margin-top: var(--space-5); }
  #command-search-input { height: 52px; font-size: 1rem; padding-right: 3.5rem; }
  .featured-secondary { flex-direction: column; }
  .resources-grid { grid-template-columns: 1fr; }
  .explorer-toolbar { align-items: flex-start; }
  .explorer-toolbar-controls { width: 100%; }
  .dropdown { flex: 1; }
  .dropdown-btn { width: 100%; justify-content: space-between; }
  .footer-links { gap: var(--space-5); flex-wrap: wrap; }
}

/* ============================================================
   ACCESIBILIDAD — reduced motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}