:root {
  color-scheme: light;
  --ink: #1d2733;
  --muted: #5c6673;
  --line: #dfe5ec;
  --brand: #2563eb;
  --soft: #eef6ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
  color: var(--ink);
  background: #f7f9fc;
  line-height: 1.72;
}

main {
  width: min(920px, calc(100% - 32px));
  margin: 40px auto;
  padding: 36px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 12px 36px rgba(15, 23, 42, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--brand);
  font-weight: 700;
}

h1 {
  margin: 22px 0 6px;
  font-size: 34px;
  line-height: 1.22;
}

h2 {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 22px;
}

p,
li {
  font-size: 17px;
}

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

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

footer {
  margin-top: 36px;
  color: var(--muted);
  font-size: 15px;
}

@media (max-width: 640px) {
  main {
    margin: 16px auto;
    padding: 24px;
    border-radius: 12px;
  }

  h1 {
    font-size: 28px;
  }
}