:root{color-scheme:dark;font-family:system-ui,"Noto Sans JP",sans-serif;color:#dce7ee;background:#080e15;line-height:1.8}
*{box-sizing:border-box}body{margin:0}main{max-width:840px;margin:auto;padding:clamp(24px,6vw,72px) 24px}
a{color:#9ce1df;text-underline-offset:5px}a:focus-visible{outline:2px solid #9ce1df;outline-offset:5px}
.brand{font:28px Georgia,serif;letter-spacing:.22em;color:#ecf5f8;text-decoration:none}.brand span{font:12px system-ui;letter-spacing:.12em}
.intro,.notice{color:#95a8b6;font-size:14px}.intro{margin-bottom:48px}.label{font-size:12px;letter-spacing:.14em;color:#9ce1df}
h1{font-size:clamp(25px,4.5vw,40px);line-height:1.45;overflow-wrap:anywhere;font-weight:500}.description{font-size:18px}
dl{display:grid;grid-template-columns:100px 1fr;gap:14px 20px;border-block:1px solid #253641;padding:24px 0;font-size:14px}dt{color:#95a8b6}dd{margin:0;overflow-wrap:anywhere}
nav,footer{display:flex;flex-wrap:wrap;gap:20px;align-items:center}nav{margin-top:32px}.primary{background:#bce9e2;color:#102325;padding:12px 20px;text-decoration:none;border-radius:4px}footer{border-top:1px solid #253641;margin-top:56px;padding-top:24px;font-size:14px}
@media(max-width:480px){dl{grid-template-columns:1fr;gap:4px}dd{margin-bottom:14px}.intro{margin-bottom:32px}}

.back{display:inline-block;margin:0 0 18px;padding:10px 14px;min-height:44px;box-sizing:border-box;border:1px solid rgba(236,245,248,.28);border-radius:999px;color:#ecf5f8;text-decoration:none;font:15px system-ui}.back:hover,.back:focus-visible{border-color:#ecf5f8}
/* 見本画像（bin/public_pages.py の thumb_figure）。引き伸ばさない。縦横比が外れるものは無地の台の中央に置く */
.thumb{margin:24px 0 8px}.thumb img{display:block;width:100%;height:auto;aspect-ratio:1200/630;border-radius:6px;border:1px solid #253641;background:#0d151f}
.thumb-cover img{object-fit:cover;object-position:top center}.thumb-contain img{object-fit:contain;padding:10px;box-sizing:border-box}
.thumb figcaption{font-size:11px;color:#95a8b6;margin-top:6px;line-height:1.6}.thumb figcaption a{color:inherit}