:root {
  --bg: #fbfbfa;
  --surface: #ffffff;
  --border: #e4e2dd;
  --text: #1c1b19;
  --muted: #6b6862;
  --accent: #1a6fd4;
  --warn-bg: #fdf6e3;
  --warn-border: #e8d9a8;
  --warn-text: #6b5514;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16151a;
    --surface: #1e1d23;
    --border: #322f3a;
    --text: #eceaf0;
    --muted: #9d99a8;
    --accent: #6aa9f0;
    --warn-bg: #2a2413;
    --warn-border: #4a3f1d;
    --warn-text: #e0cd90;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 3rem 1.5rem;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
main { max-width: 34rem; margin: 0 auto; }
.mark {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.75rem;
}
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 0.75rem; letter-spacing: -0.02em; }
h2 { font-size: 1rem; margin: 2rem 0 0.5rem; letter-spacing: -0.01em; }
p { margin: 0 0 1rem; color: var(--muted); }
p.lead { color: var(--text); font-size: 1.075rem; }
ul { color: var(--muted); padding-left: 1.1rem; margin: 0 0 1rem; }
li { margin-bottom: 0.35rem; }
a { color: var(--accent); }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.4rem;
  margin: 1.5rem 0;
}
.notice {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--warn-text);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  font-size: 0.925rem;
  margin: 1.5rem 0;
}
.notice strong { font-weight: 650; }
footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}
code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 0.875em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}
.btn {
  font: inherit;
  font-weight: 550;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 7px;
  padding: 0.6rem 1.1rem;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn.secondary {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}
.row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.925rem;
}
.row:last-child { border-bottom: none; }
.row .k { color: var(--text); }
.row .v { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.85rem; }