:root {
  --bg: #f6f3ee;
  --ink: #1c1917;
  --muted: #57534e;
  --line: #e7e5e4;
  --accent: #0f766e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #d9f3ef 0%, transparent 55%),
    radial-gradient(900px 400px at 100% 0%, #fde68a55 0%, transparent 50%),
    var(--bg);
  line-height: 1.7;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

.nav {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 28px;
}

.nav a { color: var(--accent); text-decoration: none; }
.nav a:hover { text-decoration: underline; }

h1 {
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.2;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 20px;
  margin: 36px 0 10px;
}

h3 {
  font-size: 16px;
  margin: 20px 0 6px;
}

.lead {
  font-size: 17px;
  color: var(--muted);
  margin: 0 0 28px;
}

.meta {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 20px;
}

.links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.links a {
  display: block;
  padding: 16px 18px;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
}

.links a:hover { border-color: var(--accent); color: var(--accent); }

section ul { padding-left: 1.2em; }
section li { margin: 6px 0; }

a { color: var(--accent); }

footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}