:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1c1e21;
  --muted: #6b7280;
  --accent: #2563eb;
  --border: #e5e7eb;
  --green: #16a34a;
  --red: #dc2626;
  --blue: #2563eb;
  --orange: #d97706;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --card: #1a1e24;
    --text: #e6e8eb;
    --muted: #9aa1ab;
    --accent: #6ea8fe;
    --border: #2a2f37;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 2rem 1rem 4rem;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}
main { max-width: 860px; margin: 0 auto; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.5rem; margin: 0.5rem 0 1rem; }
h2 { font-size: 1.15rem; margin: 0 0 0.75rem; }
h3 { font-size: 1rem; margin: 1rem 0 0.4rem; }
header { margin-bottom: 1.5rem; }
.back { font-size: 0.9rem; }
.meta { color: var(--muted); font-size: 0.85rem; margin: 0.25rem 0; }
.empty { color: var(--muted); }
.summary-change { margin-top: 0.6rem; }
.summary-change strong { color: var(--muted); font-weight: 600; }
section { margin-top: 2rem; }
.snapshots, .topic-list { list-style: none; padding: 0; margin: 0; }
.snapshots li {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.6rem 0.9rem;
  margin-bottom: 0.5rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.snapshots .date { font-variant-numeric: tabular-nums; font-weight: 600; }
.topic-list > li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  margin-bottom: 0.6rem;
}
.topic-list a { font-weight: 600; }
.tag {
  display: inline-block;
  padding: 0.05rem 0.45rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}
.tag.new { background: rgba(22, 163, 74, 0.14); color: var(--green); }
.tag.continuing { background: rgba(37, 99, 235, 0.12); color: var(--blue); }
.tag.up { background: rgba(22, 163, 74, 0.14); color: var(--green); }
.tag.down { background: rgba(220, 38, 38, 0.12); color: var(--red); }
.tag.flat { background: rgba(107, 114, 128, 0.18); color: var(--muted); }
.tag.rank { background: rgba(37, 99, 235, 0.10); color: var(--blue); }
.top-list { list-style: none; padding: 0; margin: 0; }
.top-item {
  display: flex;
  gap: 0.6rem;
  padding: 0.65rem 0.9rem;
  margin-bottom: 0.5rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.top-item .rank {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  min-width: 1.8rem;
  text-align: right;
}
.top-body { flex: 1; min-width: 0; }
.top-details > summary { list-style: none; cursor: pointer; }
.top-details > summary::-webkit-details-marker { display: none; }
.top-title { font-weight: 600; }
.top-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 0.2rem;
}
.top-details .q-analysis { margin-left: 0; }
.question-links { list-style: none; margin: 0.3rem 0 0; padding-left: 0; font-size: 0.9rem; }
.question-links li { margin: 0.25rem 0; }
.theme-question { display: flex; gap: 0.35rem; align-items: flex-start; }
.q-marker {
  flex: 0 0 1.15em;
  width: 1.15em;
  height: 1.15em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 0.8em;
  line-height: 1;
  margin-top: 0.62rem;
  transition: transform 0.15s;
}
.q-box {
  flex: 1;
  min-width: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.3rem 0.75rem;
}
.q-analysis { margin: 0.3rem 0 0 1.3rem; font-size: 0.9rem; }
.q-link { margin: 0 0 0.3rem; overflow-wrap: anywhere; }
.q-link a { font-weight: 600; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
th, td {
  padding: 0.4rem 0.45rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th { text-align: left; color: var(--muted); font-weight: 600; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.spark { color: var(--muted); }
.legend { display: flex; flex-wrap: wrap; gap: 0.9rem; margin: 0.75rem 0 0.25rem; font-size: 0.9rem; }
.legend-item i {
  display: inline-block;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 2px;
  margin-right: 0.3rem;
}
details summary { cursor: pointer; color: var(--accent); }
code {
  background: var(--border);
  padding: 0.1rem 0.35rem;
  border-radius: 5px;
  font-size: 0.9em;
}