:root {
  color-scheme: light;
  --ink: #1c1915;
  --muted: #5c564c;
  --line: #e4dccf;
  --paper: #f6f1e8;
  --card: #fffaf3;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 10% -10%, #efe4d2 0%, transparent 60%),
    var(--paper);
}

main {
  width: min(680px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 48px;
}

.mark {
  margin: 0 0 18px;
  letter-spacing: 0.14em;
  text-transform: lowercase;
  font-family: "Segoe UI", sans-serif;
  font-size: 13px;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-size: 48px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.lead {
  margin: 18px 0 36px;
  font-size: 18px;
  line-height: 1.8;
}

section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px 24px 8px;
  margin-bottom: 16px;
}

h2 {
  margin: 0 0 8px;
  font-size: 18px;
}

p, li {
  line-height: 1.85;
  color: var(--muted);
}

ul { margin: 0 0 14px; padding-left: 1.2em; }

footer {
  width: min(680px, calc(100% - 40px));
  margin: 0 auto;
  padding: 8px 0 40px;
  font-family: "Segoe UI", sans-serif;
  font-size: 13px;
  color: var(--muted);
}