:root {
  color-scheme: light;
  --ink: #20241f;
  --muted: #6d746d;
  --line: #dedfd8;
  --paper: #f3f1e9;
  --card: #fffdf7;
  --accent: #52604d;
}

* { box-sizing: border-box; }

html { background: var(--paper); }

body {
  width: min(820px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 72px;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.78;
}

main,
body > header,
body > nav,
body > footer {
  display: block;
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
}

h1,
h2,
h3 {
  color: #252a24;
  line-height: 1.35;
}

h1 { margin: 16px 0 24px; font-size: clamp(32px, 7vw, 48px); }
h2 { margin-top: 2.2em; font-size: 25px; }
h3 { margin-top: 1.8em; font-size: 20px; }
li { margin: 0.45em 0; }

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.lead {
  max-width: 640px;
  color: var(--muted);
  font-size: 20px;
}

.card {
  margin: 28px 0;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
}

.card h2 { margin-top: 0; }
.card a { display: block; padding: 8px 0; font-weight: 650; }

.back {
  display: inline-block;
  margin-bottom: 8px;
  text-decoration: none;
}

footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 600px) {
  body { padding-top: 34px; padding-bottom: 48px; }
  .card { padding: 20px; border-radius: 14px; }
}