:root {
  --fg: #1a1a1a;
  --bg: #ffffff;
  --muted: #666666;
  --line: #dddddd;
  --link: #0b57d0;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6e6e6;
    --bg: #161616;
    --muted: #9a9a9a;
    --line: #3a3a3a;
    --link: #8ab4f8;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--fg);
  background: var(--bg);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.8;
}

a { color: var(--link); }

.site-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  font-weight: bold;
}
.site-header a { color: inherit; text-decoration: none; }

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 16px 16px 64px;
}

h1 { font-size: 1.5rem; line-height: 1.4; }
h2 { font-size: 1.2rem; margin-top: 2em; }

.muted, .source { color: var(--muted); font-size: 0.9rem; }

ul.list { padding-left: 1.2em; }
ul.list li { margin: 0.3em 0; }

table { border-collapse: collapse; margin: 1em 0; }
th, td { border: 1px solid var(--line); padding: 4px 10px; }

pre { overflow-x: auto; padding: 12px; border: 1px solid var(--line); }

svg { max-width: 100%; height: auto; }

details {
  margin: 1em 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 12px;
}
details > summary { cursor: pointer; padding: 8px 0; font-weight: bold; }
details[open] > summary { border-bottom: 1px solid var(--line); }