:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #626d82;
  --line: #dce2ec;
  --paper: #fffefa;
  --ground: #f2f5f9;
  --brand: #315bd6;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    linear-gradient(90deg, rgba(49, 91, 214, .035) 1px, transparent 1px) 0 0 / 56px 56px,
    var(--ground);
  color: var(--ink);
  font: 16px/1.8 "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

main {
  width: min(880px, calc(100% - 32px));
  margin: 48px auto;
  padding: clamp(28px, 6vw, 64px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 22px 60px rgba(23, 32, 51, .08);
}

.back {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--brand);
  font-weight: 700;
  text-decoration: none;
}

header {
  margin: 24px 0 42px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--line);
}

header span {
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .14em;
}

h1 {
  margin: 8px 0 10px;
  font-family: "Songti SC", STSong, serif;
  font-size: clamp(34px, 6vw, 54px);
  letter-spacing: -.04em;
  line-height: 1.16;
}

header p, section p, footer { color: var(--muted); }

section {
  display: grid;
  grid-template-columns: minmax(120px, 180px) 1fr;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

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

footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-top: 32px;
  font-size: 13px;
}

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

@media (max-width: 640px) {
  main { margin: 16px auto; border-radius: 18px; }
  section { grid-template-columns: 1fr; gap: 8px; }
  footer { flex-direction: column; }
}