:root {
  --bg: #f7f8f5;
  --surface: #ffffff;
  --text: #15171a;
  --muted: #5b6168;
  --line: #e3e6e0;
  --primary: #16734a;
  --primary-soft: #e6f2ec;
  --code-bg: #f0f2ee;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111412;
    --surface: #181c1a;
    --text: #e8ebe7;
    --muted: #a3aaa5;
    --line: #2a302c;
    --primary: #5cc795;
    --primary-soft: #1b2b23;
    --code-bg: #212622;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 8px; }
.brand { font-weight: 700; color: var(--primary); text-decoration: none; letter-spacing: -0.01em; }
.lang a { color: var(--muted); text-decoration: none; font-size: 14px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px; }
.lang a:hover { color: var(--text); }
h1 { font-size: 30px; line-height: 1.25; margin: 24px 0 4px; letter-spacing: -0.02em; }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 24px; }
h2 { font-size: 20px; margin: 40px 0 8px; padding-top: 8px; letter-spacing: -0.01em; }
h3 { font-size: 16px; margin: 24px 0 4px; }
p, li { margin: 8px 0; }
ul, ol { padding-left: 22px; }
a { color: var(--primary); }
.summary { background: var(--primary-soft); border-radius: 14px; padding: 16px 20px; margin: 16px 0 8px; }
.summary ul { margin: 0; }
.note { color: var(--muted); font-size: 14px; }
.table { overflow-x: auto; margin: 12px 0; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; min-width: 560px; font-size: 14px; line-height: 1.55; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { background: var(--code-bg); font-weight: 600; }
tr:last-child td { border-bottom: 0; }
nav.toc { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 12px 20px; margin: 24px 0; font-size: 15px; }
nav.toc ol { margin: 4px 0; }
nav.toc a { text-decoration: none; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }