:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #18181b;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #4b3fe3;
  --danger: #dc2626;
  --ok: #0f766e;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121214;
    --surface: #1b1b1f;
    --text: #e5e5e5;
    --muted: #a1a1aa;
    --line: #2e2e35;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.6 -apple-system, "PingFang SC", system-ui, sans-serif;
}
.nav {
  display: flex; align-items: center; gap: 16px;
  padding: 12px 20px; background: var(--surface);
  border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5;
}
.brand { font-weight: 600; }
.nav nav { display: flex; gap: 14px; flex-wrap: wrap; flex: 1; }
.nav a { color: var(--muted); text-decoration: none; font-size: 13px; }
.nav a:hover { color: var(--brand); }
.wrap { max-width: 980px; margin: 0 auto; padding: 20px; }
h1 { font-size: 22px; margin: 8px 0 16px; }
h2 { font-size: 15px; margin: 0 0 12px; }
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 12px; padding: 16px; margin-bottom: 16px;
}
.narrow { max-width: 440px; margin: 40px auto; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 720px) { .grid { grid-template-columns: 1fr; } }
label { display: block; margin-bottom: 10px; font-size: 13px; color: var(--muted); }
input, select, textarea {
  width: 100%; padding: 9px 10px; margin-top: 4px;
  border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); color: var(--text); font: inherit;
}
button {
  margin-top: 6px; padding: 9px 14px; border: 0; border-radius: 8px;
  background: var(--brand); color: #fff; font: inherit; cursor: pointer;
}
button.ghost { background: transparent; color: var(--muted); border: 1px solid var(--line); }
button.danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: flex-end; margin-bottom: 10px; }
.row input, .row select { flex: 1 1 180px; margin-top: 0; }
.col label { margin-bottom: 12px; }
.list { list-style: none; padding: 0; margin: 0; }
.list > li {
  padding: 10px 0; border-bottom: 1px solid var(--line);
  display: flex; gap: 12px; justify-content: space-between; flex-wrap: wrap;
}
.list > li:last-child { border-bottom: 0; }
.stack { flex-direction: column; align-items: stretch; }
.muted { color: var(--muted); font-size: 12px; }
.tag {
  display: inline-block; padding: 1px 8px; border-radius: 999px;
  background: var(--bg); border: 1px solid var(--line); font-size: 11px; color: var(--muted);
}
.tiny { max-width: 180px; }
.inline { display: inline-flex; gap: 6px; align-items: center; margin: 0; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 6px; }
.questions li { margin-bottom: 8px; }
.stats { list-style: none; padding: 0; margin: 0; }
.stats li { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px dashed var(--line); }
.code {
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
  padding: 10px; word-break: break-all; font-family: ui-monospace, monospace; font-size: 13px;
}
.code.small { font-size: 11px; }
.err { color: var(--danger); }
.answer { white-space: pre-wrap; line-height: 1.8; }
.ok { color: var(--ok); }
.warn { color: #b45309; }
.btn {
  display: inline-block; padding: 9px 14px; border-radius: 8px;
  background: var(--brand); color: #fff; text-decoration: none;
}

.tagcloud { display: flex; flex-wrap: wrap; gap: var(--gap, 8px); }
.tag.big { padding: 6px 12px; font-size: 13px; }
.tag.on { border-color: var(--brand); color: var(--brand); }
.meta { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 8px; }
pre.code.small { max-height: 480px; overflow: auto; white-space: pre-wrap; }