:root {
  color-scheme: light;
  --ink: #15242b;
  --muted: #617078;
  --line: #dce5e7;
  --paper: #f7faf9;
  --accent: #206a64;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.8;
}

.page-shell {
  width: min(100% - 40px, 760px);
  margin: 0 auto;
  padding: 76px 0 48px;
}

.hero { padding-bottom: 42px; border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: .75rem; font-weight: 700; letter-spacing: .14em; }
h1, h2 { line-height: 1.25; }
h1 { margin: 0; font-size: clamp(2.1rem, 7vw, 3.5rem); letter-spacing: -.04em; }
.subtitle { margin: 14px 0 0; color: var(--muted); font-size: 1.12rem; }
section { padding: 35px 0; border-bottom: 1px solid var(--line); }
h2 { margin: 0 0 18px; font-size: 1.25rem; }
p { margin: 0 0 10px; }
ul { margin: 10px 0 0; padding-left: 1.25em; }
li + li { margin-top: 4px; }
dl { margin: 0; }
dl div { display: grid; grid-template-columns: 7em 1fr; gap: 12px; }
dt { color: var(--muted); }
dd { margin: 0; }
a { color: var(--accent); text-underline-offset: 3px; }
footer { padding: 0 20px 34px; color: var(--muted); font-size: .9rem; text-align: center; }

@media (max-width: 480px) {
  .page-shell { width: min(100% - 32px, 760px); padding-top: 52px; }
  dl div { grid-template-columns: 1fr; gap: 0; margin-bottom: 10px; }
}