:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #59636e;
  --border: #d1d9e0;
  --accent: #0b57d0;
  --code-bg: #f6f8fa;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #9198a1;
    --border: #3d444d;
    --accent: #7cacf8;
    --code-bg: #161b22;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
}

header, main, footer {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

header .brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--fg);
  text-decoration: none;
}

nav a { margin-left: 16px; }
nav a:first-child { margin-left: 0; }

main { padding-top: 8px; padding-bottom: 48px; }

h1 { font-size: 1.75rem; line-height: 1.3; margin: 1.5rem 0 0.5rem; }
h2 { font-size: 1.3rem; margin: 2.25rem 0 0.5rem; padding-top: 1rem; border-top: 1px solid var(--border); }
h3 { font-size: 1.05rem; margin: 1.5rem 0 0.25rem; }

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

.lede { color: var(--muted); margin-top: 0; }
.updated { color: var(--muted); font-size: 0.9rem; }

code {
  font: 0.88em/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  overflow-wrap: anywhere;
}

.table-wrap { overflow-x: auto; }

table {
  border-collapse: collapse;
  width: 100%;
  margin: 0.75rem 0;
  font-size: 0.95rem;
}

th, td {
  border: 1px solid var(--border);
  padding: 6px 10px;
  text-align: left;
  vertical-align: top;
}

th { background: var(--code-bg); }

.notice {
  border-left: 4px solid var(--accent);
  background: var(--code-bg);
  padding: 10px 14px;
  margin: 1rem 0;
}

footer {
  padding-top: 16px;
  padding-bottom: 32px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}