:root {
  color-scheme: light;
  --ink: #1c2430;
  --muted: #5c6b7a;
  --line: #e4e9ef;
  --paper: #f7f8fa;
  --card: #fff;
  --accent: #0f6e6b;
}
* { 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: var(--paper);
  line-height: 1.7;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-header, main, footer {
  width: min(880px, calc(100% - 32px));
  margin-inline: auto;
}
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 0;
}
.brand { font-weight: 700; color: var(--ink); letter-spacing: 0.02em; }
nav { display: flex; gap: 18px; }
.hero { padding: 18px 0 8px; }
.eyebrow { margin: 0; color: var(--accent); font-size: 0.92rem; }
h1 { margin: 6px 0 10px; font-size: 2rem; line-height: 1.25; }
.lead, .prose p { color: var(--muted); }
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding-bottom: 28px;
}
.cards article, .prose article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
}
.cards h2, .prose h2 { margin: 0 0 8px; font-size: 1.05rem; }
.cards p { margin: 0; color: var(--muted); }
.prose article { margin-bottom: 14px; }
footer { padding: 8px 0 28px; color: var(--muted); font-size: 0.92rem; }
@media (max-width: 720px) {
  .cards { grid-template-columns: 1fr; }
  h1 { font-size: 1.6rem; }
}