:root {
  --primary: #1F5FAF;
  --text: #1A1A1A;
  --muted: #5C5C5C;
  --border: #C9CED6;
  --surface: #F3F6FA;
  --bg: #FFFFFF;
}
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #8AB4F8;
    --text: #ECECEC;
    --muted: #A8A8A8;
    --border: #3C4048;
    --surface: #1E2228;
    --bg: #121418;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
  font-size: 17px;
  line-height: 1.7;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header.site { border-bottom: 1px solid var(--border); }
header.site div { max-width: 760px; margin: 0 auto; padding: 14px 16px; display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
header.site a.brand { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; }
header.site nav { display: flex; gap: 16px; flex-wrap: wrap; }
a { color: var(--primary); }
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
.muted { color: var(--muted); }
.box { background: var(--surface); border-radius: 12px; padding: 16px 20px; margin: 16px 0; }
table { border-collapse: collapse; width: 100%; margin: 8px 0; font-size: 15px; }
th, td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--surface); }
td:first-child, th:first-child { white-space: nowrap; }
.table-wrap { overflow-x: auto; }
ol, ul { padding-left: 1.4em; }
footer { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); }