:root {
  --ink: #1f4e79;
  --sub: #2e75b6;
  --text: #1c2430;
  --mute: #5d6b7a;
  --line: #d7dee6;
  --bg: #ffffff;
  --card: #f4f7fa;
  --warn-bg: #fff6e0;
  --warn-line: #e3b341;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #8ab8e6;
    --sub: #6aa5de;
    --text: #e7ecf2;
    --mute: #a0adbb;
    --line: #2f3a47;
    --bg: #11161c;
    --card: #1a222b;
    --warn-bg: #2b2412;
    --warn-line: #8a6d1f;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
}
a { color: var(--sub); }
header.site {
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}
.bar {
  max-width: 960px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}
.brand { font-weight: 700; color: var(--ink); text-decoration: none; white-space: nowrap; }
nav.steps { display: flex; gap: 4px; flex-wrap: wrap; justify-content: flex-end; }
nav.steps a, nav.steps span {
  font-size: 13px;
  padding: 4px 10px;
  border-radius: 999px;
  text-decoration: none;
  color: var(--mute);
  border: 1px solid transparent;
}
nav.steps a:hover { border-color: var(--line); }
nav.steps a.current { background: var(--ink); color: var(--bg); }
nav.steps span { opacity: .55; cursor: default; }
main { max-width: 960px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { color: var(--ink); font-size: 2rem; line-height: 1.2; margin: 8px 0 8px; }
h2 { color: var(--ink); margin-top: 2rem; border-bottom: 1px solid var(--line); padding-bottom: 4px; }
h3 { color: var(--sub); margin-bottom: 4px; }
.lead { color: var(--mute); font-size: 1.1rem; margin-top: 0; }
.notice {
  background: var(--warn-bg);
  border-left: 4px solid var(--warn-line);
  padding: 10px 14px;
  border-radius: 4px;
  margin: 16px 0;
  font-size: 15px;
}
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; }
.card h3 { margin-top: 0; }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
th { background: var(--card); }
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 40px; }
.pager a {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 16px;
  text-decoration: none;
  background: var(--card);
}
footer { border-top: 1px solid var(--line); color: var(--mute); font-size: 13px; padding: 16px; text-align: center; }
@media (max-width: 640px) {
  header.site { position: static; }
  .bar { flex-direction: column; align-items: flex-start; }
  nav.steps { justify-content: flex-start; }
  h1 { font-size: 1.6rem; }
}