/* ============================================================
   Landing page — bento grid layout, matte finish.
   All colours via [data-theme] tokens.
   See themes.css for palettes: nord | misty | onedark
   ============================================================ */

* {
  box-sizing: border-box;
}

html {
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--faint);
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
}

/* ============================================================
   Hero
   ============================================================ */

.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px 32px;
}

.eyebrow {
  margin: 0 0 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.description {
  max-width: 560px;
  margin: 12px 0 20px;
  color: var(--faint);
  line-height: 1.55;
  font-size: 15px;
}

/* ============================================================
   Search
   ============================================================ */

.search-bar {
  display: block;
  width: 100%;
  max-width: 640px;
  margin: 0 auto 16px;
  padding: 12px 16px;
  font-size: 15px;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.search-bar::placeholder {
  color: var(--faint);
}

.search-bar:focus {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* ============================================================
   Main layout
   ============================================================ */

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-header h2 {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

#topic-count {
  color: var(--faint);
  font-size: 12px;
}

/* ============================================================
   Bento grid
   ============================================================ */

.topics {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 10px;
}

/* Featured card: span 2 columns */
.topics .topic-card.featured {
  grid-column: span 2;
  padding: 22px 24px;
}

.topics .topic-card.featured .topic-title {
  font-size: 18px;
}

/* Large card: 2x2 bento block */
.topics .topic-card.large {
  grid-column: span 2;
  display: grid;
  grid-template-rows: 1fr 1fr;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.topics .topic-card.large .card-left  { grid-row: 1; grid-column: 1; }
.topics .topic-card.large .card-right { grid-row: 1; grid-column: 2; }
.topics .topic-card.large .card-full  { grid-row: 2; grid-column: 1 / -1; }

/* ---------- Topic card ---------- */

.topic-card {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition:
    border-color 150ms ease,
    background 150ms ease,
    transform 120ms ease;
}

.topic-card:hover {
  border-color: var(--accent-2);
  background: var(--hover-bg);
  transform: translateY(-1px);
}

/* Large card sub-cards */
.topics .topic-card.large .card-left,
.topics .topic-card.large .card-right,
.topics .topic-card.large .card-full {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--border-soft);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: border-color 150ms ease, background 150ms ease;
}

.topics .topic-card.large .card-left:hover,
.topics .topic-card.large .card-right:hover,
.topics .topic-card.large .card-full:hover {
  border-color: var(--accent-2);
  background: var(--hover-bg);
}

/* ---------- Card content ---------- */

.topic-title {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
}

.topic-match {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  color: var(--muted);
}

.topic-card .topic-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  font-size: 11px;
  color: var(--faint);
}

.topic-card .topic-meta .badge {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 99px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 10px;
  font-weight: 500;
}

/* ---------- No results ---------- */

.no-results {
  margin-top: 24px;
  padding: 32px;
  text-align: center;
  color: var(--faint);
  font-size: 14px;
  background: var(--panel);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  display: none;
}

/* ============================================================
   Theme switcher — top right pill
   ============================================================ */

.theme-switcher {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 100;
  display: flex;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}

.theme-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  border: none;
  background: transparent;
  color: var(--faint);
  font: inherit;
  font-size: 12px;
  padding: 6px 10px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 120ms, color 120ms;
  white-space: nowrap;
}

.theme-btn:hover {
  color: var(--text);
  background: var(--hover-bg);
}

.theme-btn.active {
  background: var(--accent-soft);
  color: var(--accent);
}

.theme-btn .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

[data-theme="nord"]    .theme-btn[data-theme="nord"]    .dot { background: #88c0d0; }
[data-theme="misty"]   .theme-btn[data-theme="misty"]   .dot { background: #3b6cb7; }
[data-theme="onedark"] .theme-btn[data-theme="onedark"] .dot { background: #89b4fa; }
[data-theme="matte"]   .theme-btn[data-theme="matte"]   .dot { background: #a8b4d0; }

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 900px) {
  .topics {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }
  .topic-card.featured,
  .topic-card.large {
    grid-column: span 1;
  }
  .topic-card.large {
    display: block;
  }
  .topic-card.large .card-left,
  .topic-card.large .card-right,
  .topic-card.large .card-full {
    display: none;
  }
  .topic-card.large .topic-title {
    font-size: 15px;
  }
}

@media (max-width: 600px) {
  .hero {
    padding-top: 40px;
  }
  h1 {
    font-size: 28px;
  }
  .description {
    font-size: 14px;
  }
  .theme-switcher {
    top: 10px;
    right: 10px;
  }
  .theme-btn .label {
    display: none;
  }
  .topics {
    grid-template-columns: 1fr;
  }
  .topic-card.featured,
  .topic-card.large {
    grid-column: span 1;
  }
}