:root {
  color-scheme: light dark;
  --bg: #f7f6f3;
  --surface: #ffffff;
  --text: #1c1b19;
  --muted: #5c5852;
  --line: #e2ded6;
  --accent: #1f6f5c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181a;
    --surface: #1e2124;
    --text: #ecebe8;
    --muted: #a8a49d;
    --line: #2e3236;
    --accent: #6fd0b3;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  line-height: 1.65;
  font-size: 17px;
}
a { color: var(--accent); }
.site-header, main, .site-footer { max-width: 46rem; margin: 0 auto; padding: 0 1.25rem; }
.site-header { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; align-items: center; justify-content: space-between; padding-top: 1.5rem; padding-bottom: 1rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; text-decoration: none; color: inherit; }
.brand__mark { display: inline-flex; align-items: center; justify-content: center; width: 2.25rem; height: 2.25rem; border-radius: 0.75rem; background: var(--accent); color: var(--bg); font-weight: 700; }
.brand__name { font-weight: 650; letter-spacing: 0.01em; }
.brand__cn { margin-left: 0.5rem; color: var(--muted); font-weight: 500; }
.site-nav { display: flex; gap: 1rem; font-size: 0.95rem; }
.site-nav a { text-decoration: none; color: var(--muted); }
.site-nav a:hover { color: var(--accent); }
.hero { padding: 2rem 0 1rem; }
.hero__eyebrow { margin: 0 0 0.5rem; color: var(--muted); font-size: 0.9rem; letter-spacing: 0.08em; text-transform: uppercase; }
.hero__title { margin: 0 0 1rem; font-size: clamp(1.9rem, 5vw, 2.6rem); line-height: 1.25; }
.hero__lead { margin: 0 0 1.25rem; color: var(--muted); }
.hero__points { margin: 0; padding-left: 1.1rem; display: grid; gap: 0.4rem; }
.card { margin: 1.5rem 0; padding: 1.5rem; background: var(--surface); border: 1px solid var(--line); border-radius: 1rem; }
.card h2 { margin-top: 0; font-size: 1.2rem; }
.card p { margin: 0 0 0.85rem; }
.card p:last-child { margin-bottom: 0; }
.facts { margin: 0; display: grid; gap: 0.5rem 1rem; }
.facts dt { font-weight: 650; }
.facts dd { margin: 0 0 0.4rem; color: var(--muted); }
@media (min-width: 34rem) { .facts { grid-template-columns: 8rem 1fr; } .facts dd { margin-bottom: 0; } }
.button { display: inline-block; padding: 0.6rem 1.1rem; border-radius: 0.6rem; background: var(--accent); color: var(--bg); text-decoration: none; font-weight: 600; }
.site-footer { padding-top: 1.5rem; padding-bottom: 2.5rem; color: var(--muted); font-size: 0.9rem; }
.site-footer p { margin: 0.2rem 0; }
.site-footer__note { font-size: 0.85rem; }
.status { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.35rem 0.75rem; border: 1px solid var(--line); border-radius: 999px; font-size: 0.9rem; color: var(--muted); }