:root {
  color-scheme: light;
  --ink: #172026;
  --muted: #5c6970;
  --line: #dce2e5;
  --surface: #ffffff;
  --canvas: #f3f6f5;
  --brand: #0f766e;
  --brand-dark: #0b5651;
  --accent: #d97706;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--canvas);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, #e8f3f1 0, var(--canvas) 280px),
    var(--canvas);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

a {
  color: var(--brand-dark);
}

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 56px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.brand__mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  color: #fff;
  background: var(--brand);
  border-radius: 8px;
}

.intro {
  padding: 42px 0 34px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-family: "STSong", "Songti SC", serif;
  font-size: clamp(34px, 7vw, 58px);
  line-height: 1.12;
}

.lead {
  max-width: 680px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  padding: 28px 0;
}

.link-card {
  min-height: 132px;
  padding: 20px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  text-decoration: none;
}

.link-card:hover {
  border-color: var(--brand);
}

.link-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 17px;
}

.link-card span {
  color: var(--muted);
  font-size: 14px;
}

.details {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 10px 18px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.details dt {
  color: var(--muted);
}

.details dd {
  margin: 0;
  overflow-wrap: anywhere;
}

footer {
  padding-top: 28px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

@media (max-width: 680px) {
  .shell {
    padding-top: 28px;
  }

  .intro {
    padding-top: 32px;
  }

  .link-grid {
    grid-template-columns: 1fr;
  }

  .details {
    grid-template-columns: 1fr;
  }

  .details dt {
    margin-top: 8px;
  }
}