:root { --bg: #fbfaf7; --fg: #22262b; --muted: #5d6670; --accent: #1f6f8b; --line: #e3e0d8; --code: #f0eee8; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #16191c; --fg: #e6e8ea; --muted: #a2a9b0; --accent: #6cc0dd; --line: #2c3237; --code: #23282d; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.8 system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", Meiryo, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 24px; }
h1 { font-size: 1.6rem; line-height: 1.3; margin: 0 0 16px; }
h2 { font-size: 1.1rem; margin: 32px 0 8px; padding-bottom: 4px; border-bottom: 1px solid var(--line); }
p, li { overflow-wrap: anywhere; }
ul { padding-left: 1.3em; }
a { color: var(--accent); }
code { background: var(--code); padding: 1px 5px; border-radius: 4px; font-size: .9em; }
.lead { font-size: 1.05rem; }
.meta, .en { color: var(--muted); font-size: .92rem; }
.links { margin-top: 32px; font-weight: 600; }
footer { max-width: 720px; margin: 0 auto; padding: 16px; color: var(--muted); font-size: .85rem; border-top: 1px solid var(--line); }