:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #1f1f1f;
  --muted: #5c5c5c;
  --line: #e2e2e2;
  --link: #0f766e;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --text: #fafafa;
    --muted: #a1a1a1;
    --line: #333333;
    --link: #2dd4bf;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.8;
  overflow-wrap: anywhere;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 30px; line-height: 1.3; margin: 0 0 16px; }
h2 { font-size: 18px; line-height: 1.4; margin: 36px 0 8px; }
p { margin: 8px 0; }
ul, ol { margin: 8px 0; padding-left: 24px; }
li { margin: 4px 0; }
a { color: var(--link); }
.lead { font-size: 17px; }
.scroll { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 14px; margin: 12px 0; }
th, td { border-bottom: 1px solid var(--line); padding: 8px; text-align: left; vertical-align: top; }
section { margin-top: 40px; border-top: 1px solid var(--line); }
footer { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }