body{font-family:system-ui,-apple-system,"Hiragino Sans","Noto Sans JP",sans-serif;max-width:760px;margin:0 auto;padding:24px 16px 48px;line-height:1.8;color:#222}
h1{font-size:1.6em}h2{font-size:1.2em;margin-top:2em;border-bottom:1px solid #ddd}
nav a{margin-right:1em}code{background:#f3f3f3;padding:0 4px;border-radius:3px;font-size:.9em}
.en{color:#555;font-size:.92em}footer{margin-top:3em;font-size:.9em;color:#666;border-top:1px solid #ddd;padding-top:1em}