:root {
  color-scheme: light;
  --paper: #f7f7f4;
  --ink: #171a18;
  --muted: #66706d;
  --line: #d9ddd7;
  --panel: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    "Avenir Next", "Helvetica Neue", ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.68;
}

a {
  color: inherit;
  text-decoration: none;
}

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 28px clamp(20px, 5vw, 56px) 80px;
}

.topnav {
  display: flex;
  gap: 18px;
  padding-bottom: 56px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

header p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 850;
  text-transform: uppercase;
}

h1 {
  max-width: 720px;
  margin: 0 0 28px;
  font-size: clamp(44px, 8vw, 82px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin: 34px 0 10px;
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: 0;
}

p,
li,
.links span {
  color: var(--muted);
  font-size: 18px;
}

.card {
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.links {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.links a {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.links strong {
  font-size: 24px;
  line-height: 1.2;
}

.prose p:last-child {
  margin-bottom: 0;
}