:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --border: #e4e8f0;
  --text: #1f2937;
  --muted: #6b7280;
  --news: #059669;
  --alert: #2563eb;
  --trends: #ea580c;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04);
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --surface: #161b22;
    --border: #262c36;
    --text: #e6edf3;
    --muted: #8b949e;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "Sarabun", "Noto Sans Thai", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 26px; }
.topbar h1 { font-size: 18px; margin: 0; }
.sub { margin: 0; font-size: 12px; color: var(--muted); }

.refresh {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  transition: background .15s;
}
.refresh:hover { background: var(--bg); }
.refresh:disabled { opacity: .5; cursor: default; }

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding: 16px 20px 40px;
  max-width: 1400px;
  margin: 0 auto;
  align-items: start;
}
@media (max-width: 900px) {
  .board { grid-template-columns: 1fr; }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 120px);
  overflow: hidden;
}
@media (max-width: 900px) {
  .panel { max-height: 70vh; }
}

.phead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 2px solid var(--border);
}
.ptitle { font-weight: 700; font-size: 14px; display: flex; align-items: center; gap: 7px; }
.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.dot.news { background: var(--news); }
.dot.alert { background: var(--alert); }
.dot.trends { background: var(--trends); }
.panel[data-source="news"] .phead { border-bottom-color: var(--news); }
.panel[data-source="alert"] .phead { border-bottom-color: var(--alert); }
.panel[data-source="trends"] .phead { border-bottom-color: var(--trends); }

.pcount {
  font-size: 11px;
  color: var(--muted);
  background: var(--bg);
  border-radius: 20px;
  padding: 2px 9px;
}

.filters { display: flex; flex-wrap: wrap; gap: 8px; padding: 10px 14px; border-bottom: 1px solid var(--border); }
.kw {
  flex: 1;
  min-width: 120px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 13px;
}
.rc {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 8px;
  font-size: 12px;
  cursor: pointer;
}
.kw:focus, .rc:focus { outline: 2px solid var(--alert); outline-offset: -1px; }

.list { overflow-y: auto; padding: 8px; flex: 1; }

.card {
  display: block;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 8px;
  transition: border-color .15s, transform .05s;
}
.card:hover { border-color: var(--alert); }
.card:active { transform: scale(.995); }
.card .src { font-size: 11px; font-weight: 700; color: var(--alert); margin-bottom: 3px; }
.panel[data-source="news"] .card .src { color: var(--news); }
.panel[data-source="trends"] .card .src { color: var(--trends); }
.card .ttl { font-weight: 600; font-size: 14px; margin-bottom: 4px; }
.card .snip { font-size: 12px; color: var(--muted); margin-bottom: 5px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card .meta { font-size: 11px; color: var(--muted); }

.rank {
  display: inline-block;
  min-width: 20px;
  text-align: center;
  font-weight: 700;
  color: var(--trends);
  margin-right: 6px;
}

.state {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  padding: 30px 16px;
}
.state.error { color: #dc2626; }
.state a { color: var(--alert); }
.state code {
  display: inline-block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 6px;
  font-size: 11px;
}

.errbadge {
  font-size: 11px;
  color: #b45309;
  background: #fef3c7;
  border-radius: 20px;
  padding: 2px 9px;
}
@media (prefers-color-scheme: dark) {
  .errbadge { background: #422006; color: #fbbf24; }
}

.skeleton { animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 0%,100% { opacity: .5; } 50% { opacity: 1; } }

/* ---------- Trends: expandable cards ---------- */
.trend {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 8px;
  overflow: hidden;
}
.trend-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 11px;
  cursor: pointer;
  transition: background .12s;
}
.trend-head:hover { background: var(--bg); }
.trend-head.open { background: var(--bg); border-bottom: 1px solid var(--border); }
.trend-main { flex: 1; min-width: 0; }
.trend-term { font-weight: 600; font-size: 14px; }
.trend-sub {
  font-size: 11px; color: var(--muted);
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
}
.trend-sub .vol { color: var(--text); font-weight: 700; }
.trend-sub .pct { color: var(--news); font-weight: 700; }
.trend-sub .ago { color: var(--muted); }
.trend-bd {
  font-size: 11px; color: var(--muted); margin-top: 3px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.trend-caret {
  font-size: 11px; color: var(--trends);
  border: 1px solid var(--border); border-radius: 20px;
  padding: 2px 8px; white-space: nowrap;
}
.trend-head.open .trend-caret { background: var(--trends); color: #fff; border-color: var(--trends); }

.rel-box { padding: 8px 10px; background: var(--bg); }
.rel-tf { display: flex; gap: 6px; margin-bottom: 8px; }
.rel-tf button {
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  border-radius: 6px; padding: 3px 10px; font-size: 11px; cursor: pointer;
}
.rel-tf button.on { background: var(--trends); color: #fff; border-color: var(--trends); }

.rel-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
@media (max-width: 480px) { .rel-grid { grid-template-columns: 1fr; } }
.rel-col { min-width: 0; }
.rel-h {
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: .03em; color: var(--muted); margin-bottom: 5px;
}
.rel-row {
  display: flex; align-items: center; justify-content: space-between; gap: 6px;
  text-decoration: none; color: inherit;
  padding: 4px 6px; border-radius: 6px; font-size: 12px;
}
.rel-row:hover { background: var(--surface); }
.rel-q { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rel-v { font-weight: 700; color: var(--muted); white-space: nowrap; font-size: 11px; }
.rel-v.up { color: var(--news); }

/* expanded trend sections: In the news / คำที่เกี่ยวข้อง / Top-Rising */
.tn-news:empty, .tn-terms:empty, .tn-rel:empty { display: none; }
.tn-terms:not(:empty), .tn-rel:not(:empty) {
  border-top: 1px solid var(--border);
  margin-top: 8px;
  padding-top: 8px;
}
.news-item {
  display: flex; gap: 8px; align-items: flex-start;
  text-decoration: none; color: inherit;
  padding: 6px; border-radius: 8px;
}
.news-item:hover { background: var(--surface); }
.news-img {
  width: 52px; height: 52px; flex: 0 0 52px;
  object-fit: cover; border-radius: 6px; background: var(--border);
}
.news-img.ph { background: var(--border); }
.news-body { min-width: 0; }
.news-ttl {
  font-size: 12px; font-weight: 600; line-height: 1.35;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.news-meta { font-size: 11px; color: var(--muted); margin-top: 2px; }

.rel-note { font-size: 11px; color: var(--muted); margin-bottom: 8px; }
.rel-note a { color: var(--alert); }
.bd-chips { display: flex; flex-wrap: wrap; gap: 5px; }
.bd-chip {
  font-size: 12px; text-decoration: none;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 20px; padding: 3px 10px;
}
.bd-chip:hover { border-color: var(--trends); color: var(--trends); }