:root { color-scheme: light dark; --fg: #1f2328; --muted: #5f656b; --bg: #ffffff; --line: #dfe1dc; --accent: #2d5f8a; }
@media (prefers-color-scheme: dark) { :root { --fg: #e6e8ea; --muted: #a1a8ae; --bg: #16191c; --line: #30363b; --accent: #8fbbe3; } }
body { margin: 0; padding: 0 16px 48px; background: var(--bg); color: var(--fg); font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif; line-height: 1.85; }
header, main, footer { max-width: 760px; margin: 0 auto; }
.site-nav { display: flex; flex-wrap: wrap; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--line); font-size: 0.92rem; }
.site-nav a:first-child { font-weight: 700; margin-right: auto; }
a { color: var(--accent); }
h1 { font-size: 1.6rem; margin: 28px 0 12px; }
h3 { font-size: 1.05rem; margin: 26px 0 6px; }
p, li { max-width: 70ch; }
.tbl { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
th, td { border: 1px solid var(--line); padding: 6px 8px; text-align: left; vertical-align: top; }
footer { margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 0.85rem; color: var(--muted); display: flex; gap: 12px; flex-wrap: wrap; }