:root {
  --bg: #ffffff;
  --fg: #1c1f23;
  --muted: #5c6570;
  --line: #e3e7eb;
  --accent: #0b5c8a;
  --accent-bg: #eef5f9;
  --card: #f7f9fb;
  --max: 760px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --fg: #e8ebee;
    --muted: #a2acb6;
    --line: #2a2f35;
    --accent: #6cb6dd;
    --accent-bg: #1b262d;
    --card: #1a1e22;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  font-size: 17px;
  line-height: 1.85;
}
a { color: var(--accent); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
img { max-width: 100%; height: auto; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

header.site {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}
header.site .wrap { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: baseline; }
.logo { font-weight: 700; font-size: 1.1rem; text-decoration: none; color: var(--fg); }
.logo span { color: var(--muted); font-weight: 400; font-size: .8rem; margin-left: 8px; }
nav.site ul { list-style: none; display: flex; gap: 16px; margin: 0; padding: 0; flex-wrap: wrap; }
nav.site a { text-decoration: none; font-size: .92rem; }

.pr {
  background: var(--accent-bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 14px;
  font-size: .85rem;
  color: var(--muted);
  margin: 20px 0;
}
.pr strong { color: var(--fg); }

h1 { font-size: 1.6rem; line-height: 1.5; margin: 28px 0 10px; }
h2 { font-size: 1.22rem; margin: 36px 0 12px; padding-bottom: 6px; border-bottom: 2px solid var(--line); }
h3 { font-size: 1.05rem; margin: 26px 0 8px; }
p { margin: 0 0 1.1em; }
.lead { color: var(--muted); }
.meta { color: var(--muted); font-size: .85rem; margin: 0 0 20px; }

ul.body, ol.body { padding-left: 1.3em; }
ul.body li, ol.body li { margin-bottom: .5em; }

table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: .93rem; }
.table-scroll { overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 9px 11px; text-align: left; vertical-align: top; }
th { background: var(--card); font-weight: 600; }

.note {
  background: var(--card);
  border-left: 4px solid var(--accent);
  padding: 14px 16px;
  margin: 22px 0;
  font-size: .93rem;
}
.check { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 16px 20px; margin: 22px 0; }
.check ul { margin: 0; padding-left: 1.2em; }

.cards { display: grid; gap: 14px; margin: 22px 0 40px; }
.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 18px;
  background: var(--card);
}
.card h3 { margin: 0 0 6px; font-size: 1.02rem; }
.card h3 a { text-decoration: none; }
.card p { margin: 0; font-size: .92rem; color: var(--muted); }

footer.site {
  border-top: 1px solid var(--line);
  margin-top: 56px;
  padding: 24px 0 40px;
  font-size: .88rem;
  color: var(--muted);
}
footer.site ul { list-style: none; display: flex; gap: 16px; padding: 0; margin: 0 0 12px; flex-wrap: wrap; }

@media (min-width: 640px) {
  body { font-size: 17.5px; }
  h1 { font-size: 1.9rem; }
  .cards { grid-template-columns: 1fr 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}