:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b6b70;
  --note: #b45309;
  --border: #e5e5ea;
  --accent: #0a63c9;
  --card: #f7f7f9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --fg: #e8e8ea;
    --muted: #9a9aa2;
    --note: #f0b429;
    --border: #2c2d31;
    --accent: #4c9dff;
    --card: #1f2024;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  line-height: 1.85;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 2.5rem 1.25rem 5rem; }
h1 { font-size: 1.6rem; line-height: 1.4; margin: 0 0 1.25rem; }
h2 { font-size: 1.2rem; margin: 2.5rem 0 0.75rem; padding-top: 0.5rem; border-top: 1px solid var(--border); }
p { margin: 0.9rem 0; }
a { color: var(--accent); }
ul, ol { padding-left: 1.4rem; }
li { margin: 0.4rem 0; }
hr { border: none; border-top: 1px solid var(--border); margin: 1.5rem 0; }
.meta {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}
.meta p { margin: 0.35rem 0; }
.note { color: var(--note); font-size: 0.85em; }
.ph { color: var(--muted); font-style: italic; }
.tablewrap { overflow-x: auto; margin: 1rem 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; min-width: 480px; }
th, td { border: 1px solid var(--border); padding: 0.6rem 0.75rem; text-align: left; vertical-align: top; }
th { background: var(--card); }
.foot { margin-top: 3rem; color: var(--muted); font-size: 0.9rem; }
.nav { margin-bottom: 2rem; font-size: 0.9rem; }
.nav a { margin-right: 1rem; }