:root { --bg: #fafaf8; --fg: #1f2328; --muted: #59636e; --line: #d8dee4; --accent: #0b6e4f; }
@media (prefers-color-scheme: dark) { :root { --bg: #15181c; --fg: #e6e8eb; --muted: #9aa4ae; --line: #2d333b; --accent: #4cc38a; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.75 -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 40px 16px 64px; }
h1 { font-size: 1.6rem; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; padding-top: 16px; border-top: 1px solid var(--line); }
p, li { margin: 0 0 10px; }
.meta { color: var(--muted); font-size: .9rem; margin-bottom: 24px; }
a { color: var(--accent); }
nav { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 32px; font-size: .95rem; }
.en { color: var(--muted); font-size: .92rem; }