:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #516078;
  --accent: #1456a0;
  --line: #d8e0ea;
  --surface: #ffffff;
  --background: #f4f7fb;
  --warning-bg: #fff3d7;
  --warning-ink: #61420b;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--background);
  color: var(--ink);
  font: 16px/1.72 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

a { color: var(--accent); text-underline-offset: 3px; }
a:hover, a:focus-visible { text-decoration-thickness: 2px; }

header, main, footer { max-width: 860px; margin: 0 auto; padding: 0 22px; }

header { padding-top: 44px; padding-bottom: 22px; }

header p, .muted { color: var(--muted); }
.eyebrow { color: var(--accent); font-size: 0.86rem; font-weight: 700; letter-spacing: 0.04em; }
.lead { font-size: 1.06rem; }

h1 { margin: 0 0 12px; font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.25; }
h2 { margin: 0 0 12px; font-size: 1.28rem; line-height: 1.4; }
h3 { margin: 20px 0 8px; font-size: 1.05rem; }
p, ul, ol { margin-top: 0; }
li + li { margin-top: 6px; }
dt { font-weight: 700; margin-top: 14px; }
dd { margin-left: 0; color: var(--muted); }

nav { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 20px; }

main { padding-bottom: 36px; }

section, article, .card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 24px;
  margin: 0 0 18px;
}

.notice, .draft-warning {
  background: var(--warning-bg);
  border: 1px solid #e7ba61;
  border-radius: 12px;
  color: var(--warning-ink);
  padding: 16px 20px;
  margin: 0 0 22px;
}

.notice p:last-child, .draft-warning p:last-child, section p:last-child { margin-bottom: 0; }

code {
  overflow-wrap: anywhere;
  background: #eef2f7;
  padding: 2px 5px;
  border-radius: 4px;
}

footer { border-top: 1px solid var(--line); padding-top: 18px; padding-bottom: 35px; color: var(--muted); font-size: 0.92rem; }

@media (max-width: 600px) {
  header { padding-top: 28px; }
  section, article, .card { padding: 18px; }
}