:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1c1f24;
  --muted: #5b6270;
  --border: #e4e2dc;
  --accent: #1f5fbf;
  --accent-soft: #e8f0fb;
  --g1: #b8462e;
  --g1-soft: #fbece8;
  --cit: #c8102e;
  --cit-soft: #fce9ec;
  --radius: 14px;
  --max: 1040px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1c1f25;
    --text: #e8e9ec;
    --muted: #a0a6b2;
    --border: #2d313a;
    --accent: #7fb0ff;
    --accent-soft: #1d2a40;
    --g1: #f0947e;
    --g1-soft: #36231f;
    --cit: #ff8a9b;
    --cit-soft: #3a1f25;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

header.site {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 64px; flex-wrap: wrap;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none;
}
.brand img { width: 28px; height: 28px; }
nav.main { display: flex; gap: 4px 18px; flex-wrap: wrap; padding: 8px 0; }
nav.main a { color: var(--muted); text-decoration: none; font-size: .95rem; }
nav.main a:hover, nav.main a[aria-current="page"] { color: var(--text); }

.hero { padding: 64px 0 40px; }
.hero h1 { font-size: clamp(1.9rem, 4.5vw, 2.8rem); line-height: 1.2; margin: 0 0 16px; letter-spacing: -.01em; }
.hero p.lead { font-size: 1.15rem; color: var(--muted); max-width: 680px; margin: 0; }
.hero p.zh { margin-top: 8px; }

section { padding: 28px 0; }
h2 { font-size: 1.5rem; margin: 0 0 16px; }
h3 { font-size: 1.15rem; margin: 0 0 8px; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; display: flex; flex-direction: column; gap: 12px;
}
.card .tag {
  align-self: flex-start; font-size: .8rem; font-weight: 600; padding: 3px 10px; border-radius: 999px;
}
.card.g1 .tag { background: var(--g1-soft); color: var(--g1); }
.card.cit .tag { background: var(--cit-soft); color: var(--cit); }
.card h3 { font-size: 1.35rem; margin: 0; }
.card .sub { color: var(--muted); margin: -6px 0 0; }
.card ul { margin: 0; padding-left: 20px; }
.card li { margin: 4px 0; }
.card .btn { margin-top: auto; }
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 10px; font-weight: 600;
  text-decoration: none; text-align: center;
}
.card.g1 .btn { background: var(--g1); color: #fff; }
.card.cit .btn { background: var(--cit); color: #fff; }
@media (prefers-color-scheme: dark) {
  .card.g1 .btn, .card.cit .btn { color: #14161a; }
}

.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.fact { border-left: 3px solid var(--accent); padding: 4px 0 4px 14px; }
.fact p { margin: 0; color: var(--muted); }

.prose { max-width: 740px; }
.prose p, .prose li { color: var(--text); }
.prose h2 { margin-top: 32px; }
.note {
  background: var(--accent-soft); border-radius: var(--radius); padding: 18px 20px; margin: 24px 0;
}
.muted { color: var(--muted); }

footer.site {
  border-top: 1px solid var(--border); margin-top: 48px; padding: 28px 0 40px;
  color: var(--muted); font-size: .9rem;
}
footer.site .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }
footer.site nav { display: flex; gap: 16px; flex-wrap: wrap; }
footer.site a { color: var(--muted); }