/* ================================================================
   page-cheatsheet-home.css — Cheatsheet hub (/cheatsheets/)
   ================================================================
   Big hero number, search-first UX, category pills, glass cards.
   ================================================================ */

body[data-page="cheatsheet-hub"] { overflow-x: clip; }

body[data-page="cheatsheet-hub"] .main-content,
body[data-page="cheatsheet-hub"] .content-body {
  min-width: 0;
  overflow-x: clip;
}

/* ── Hub container ── */
.cs-hub {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-10) var(--space-6) var(--space-16);
}

/* ── Hero — big number + title ── */
.cs-hub__hero {
  text-align: center;
  margin-bottom: var(--space-10);
}

.cs-hub__eyebrow {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.cs-hub__hero-number {
  line-height: 1;
  margin-bottom: var(--space-2);
}

.cs-hub__big-num {
  font-size: clamp(5rem, 18vw, 10rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  opacity: 0.15;
  font-variant-numeric: tabular-nums;
  display: block;
  user-select: none;
  background: linear-gradient(180deg, rgba(255,255,255,0.2), rgba(255,255,255,0.05));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cs-hub__title {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin: 0 0 var(--space-3);
  line-height: 1.1;
}

.cs-hub__sub {
  color: var(--text-secondary);
  font-size: var(--text-base);
  line-height: 1.6;
  margin: 0;
  max-width: 480px;
  margin-inline: auto;
}

/* ── Search ── */
.cs-hub__search-wrap {
  margin-bottom: var(--space-6);
}

.cs-hub__search-inner {
  position: relative;
  max-width: 520px;
  margin: 0 auto var(--space-2);
}

.cs-hub__search-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.cs-hub__search-input {
  width: 100%;
  padding: var(--space-4) var(--space-12) var(--space-4) calc(var(--space-4) + 20px + var(--space-3));
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 18px;
  color: var(--text-primary);
  font-size: var(--text-base);
  font-family: inherit;
  outline: none;
  transition: border-color 150ms, box-shadow 150ms;
  box-sizing: border-box;
}

.cs-hub__search-input::placeholder {
  color: var(--text-muted);
  transition: opacity 300ms;
}

.cs-hub__search-input:focus {
  border-color: rgba(124, 106, 247, 0.5);
  box-shadow: 0 0 0 3px rgba(124, 106, 247, 0.15);
}

.cs-hub__search-kbd {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  padding: 2px 7px;
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  pointer-events: none;
  transition: opacity 150ms;
}

.cs-hub__search-input:focus ~ .cs-hub__search-kbd,
.cs-hub__search-input:not(:placeholder-shown) ~ .cs-hub__search-kbd {
  opacity: 0;
}

.cs-hub__search-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  min-height: 20px;
}

.cs-hub__search-count {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin: 0;
}

.cs-hub__search-count strong {
  color: var(--text-secondary);
  font-weight: var(--weight-semibold);
}

.cs-hub__search-hint {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin: 0;
  font-family: var(--font-mono);
}

/* ── Category pills ── */
.cs-hub__cats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-8);
}

.cs-hub__cat {
  padding: 6px var(--space-4);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  font-family: inherit;
  cursor: pointer;
  transition: border-color 120ms, color 120ms, background 120ms;
  white-space: nowrap;
}

.cs-hub__cat:hover {
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text-secondary);
}

.cs-hub__cat--active {
  background: rgba(124, 106, 247, 0.15);
  border-color: rgba(124, 106, 247, 0.3);
  color: var(--accent);
}

/* ── Section labels ── */
.cs-hub__section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 var(--space-3);
}

/* ── Recently visited ── */
.cs-hub__recent {
  margin-bottom: var(--space-8);
}

.cs-hub__recent[hidden] { display: none; }

.cs-hub__recent-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.cs-hub__recent-card {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px var(--space-4);
  background: transparent;
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  transition: border-color 120ms, color 120ms, background 120ms;
  white-space: nowrap;
}

.cs-hub__recent-card:hover {
  border-color: rgba(124, 106, 247, 0.3);
  border-style: solid;
  color: var(--text-primary);
  background: rgba(124, 106, 247, 0.06);
}

.cs-hub__recent-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.cs-hub__recent-arrow {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform 120ms, opacity 120ms;
  opacity: 0;
}

.cs-hub__recent-card:hover .cs-hub__recent-arrow {
  opacity: 1;
  transform: translateX(2px);
}

.cs-hub__recent-name { overflow-wrap: anywhere; }

/* ── Popular row ── */
.cs-hub__popular {
  margin-bottom: var(--space-8);
}

.cs-hub__popular[hidden] { display: none; }

.cs-hub__popular-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.cs-hub__popular-card {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  text-decoration: none;
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  transition: border-color 120ms, box-shadow 120ms, background 120ms, transform 120ms;
  white-space: nowrap;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.04),
    0 4px 12px rgba(0, 0, 0, 0.15);
}

.cs-hub__popular-card:hover {
  border-color: rgba(124, 106, 247, 0.3);
  background: rgba(124, 106, 247, 0.08);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    0 8px 24px rgba(0, 0, 0, 0.25);
  transform: translateY(-2px);
}

.cs-hub__popular-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.cs-hub__popular-arrow {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform 120ms;
}

.cs-hub__popular-card:hover .cs-hub__popular-arrow {
  transform: translateX(2px);
}

.cs-hub__popular-name { overflow-wrap: anywhere; }

/* ── Main card grid ── */
.cs-hub__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(155px, 1fr));
  gap: var(--space-2);
}

.cs-hub__card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  min-height: 50px;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  text-decoration: none;
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  opacity: 0.7;
  transition: border-color 120ms, color 120ms, box-shadow 120ms, background 120ms, opacity 120ms, transform 120ms;
}

.cs-hub__card--popular {
  opacity: 1;
  color: var(--text-secondary);
}

.cs-hub__card--reveal {
  animation: cs-card-in 280ms var(--ease-out) both;
}

.cs-hub__card:hover,
.cs-hub__card:focus-visible {
  border-color: rgba(124, 106, 247, 0.25);
  color: var(--text-primary);
  background: rgba(124, 106, 247, 0.06);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  opacity: 1;
  transform: translateY(-2px);
}

.cs-hub__card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.cs-hub__card[hidden] { display: none; }

.cs-hub__card-name {
  line-height: 1.3;
  flex: 1;
}

.cs-hub__card-arrow {
  flex-shrink: 0;
  color: var(--text-muted);
  transition: color 120ms, transform 120ms;
  opacity: 0;
}

.cs-hub__card:hover .cs-hub__card-arrow,
.cs-hub__card:focus-visible .cs-hub__card-arrow {
  opacity: 1;
  color: var(--accent);
  transform: translateX(2px);
}

/* ── Empty state ── */
.cs-hub__empty {
  text-align: center;
  padding: var(--space-16) 0;
}

.cs-hub__empty-title {
  color: var(--text-secondary);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  margin: 0 0 var(--space-2);
}

.cs-hub__empty-msg {
  color: var(--text-muted);
  font-size: var(--text-sm);
  margin: 0;
}

.cs-hub__empty-msg code {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  padding: 1px 6px;
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .cs-hub {
    padding: var(--space-8) var(--space-4) var(--space-12);
  }

  .cs-hub__big-num {
    font-size: clamp(4rem, 22vw, 7rem);
  }

  .cs-hub__grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  }
}

@media (max-width: 480px) {
  .cs-hub__search-kbd { display: none; }
  .cs-hub__search-input { padding-right: var(--space-5); }

  .cs-hub__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
  }

  .cs-hub__card {
    min-height: 44px;
    font-size: var(--text-xs);
  }

  .cs-hub__popular-grid {
    gap: var(--space-2);
  }
}

@media (prefers-reduced-motion: reduce) {
  .cs-hub__card { transition: none; }
  .cs-hub__card:hover { transform: none; }
  .cs-hub__popular-card { transition: none; }
  .cs-hub__popular-card:hover { transform: none; }
}