:root{--bg:#f4f6f3;--ink:#1c2420;--sub:#3f4d46;--line:#cdd6d0;--accent:#1d6b56;--mat:#2b5a4c;--panel:#e8eee9}
@media (prefers-color-scheme:dark){:root{--bg:#121816;--ink:#e5ece8;--sub:#a8b8b0;--line:#2c3a34;--accent:#6fcfb0;--mat:#1b3a31;--panel:#1a2420}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic","Noto Sans JP",Meiryo,sans-serif;line-height:2;font-size:1.02rem}
a{color:var(--accent);text-underline-offset:.22em}
a:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}
.wrap{max-width:980px;margin:0 auto;padding:0 1.25rem}
header.site{color:#f1f6f3;padding:4rem 0 3rem;background-color:var(--mat);background-image:linear-gradient(rgba(255,255,255,.2) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.2) 1px,transparent 1px),linear-gradient(rgba(255,255,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.07) 1px,transparent 1px);background-size:120px 120px,120px 120px,24px 24px,24px 24px;background-position:-1px -1px}
header.site h1{margin:0;font-family:"Hiragino Mincho ProN","Yu Mincho","Noto Serif JP",serif;font-weight:700;font-size:clamp(1.7rem,6.5vw,3.6rem);line-height:1.2;letter-spacing:.02em;overflow-wrap:anywhere}
header.site p{margin:1rem 0 0;max-width:34rem;line-height:1.8;color:#d6e4dd}
.links{display:flex;flex-wrap:wrap;gap:.6rem;margin:1.6rem 0 0;padding:0;list-style:none}
.links a{display:inline-flex;align-items:center;gap:.5rem;color:#f1f6f3;text-decoration:none;font-weight:600;border:1px solid rgba(255,255,255,.55);border-radius:999px;padding:.4rem 1.1rem;line-height:1.6;transition:background .15s,color .15s}
.links a:hover{background:#f1f6f3;color:var(--mat)}
.links a:focus-visible{outline-color:#fff}
.links svg{width:1.05em;height:1.05em}
.layout{padding-top:2.5rem}
.toc ul{list-style:none;margin:0 0 2rem;padding:0;display:flex;gap:.5rem;overflow-x:auto;white-space:nowrap}
.toc a{display:block;color:var(--sub);text-decoration:none;font-size:.9rem;line-height:1.6;border:1px solid var(--line);border-radius:999px;padding:.2rem .85rem}
.toc a.on{color:var(--ink);border-color:var(--accent);font-weight:600}
@media (min-width:900px){
  .layout{display:grid;grid-template-columns:190px minmax(0,1fr);gap:4rem;align-items:start;padding-top:3rem}
  .toc{position:sticky;top:1.5rem}
  .toc ul{display:block;margin:0;overflow:visible;white-space:normal}
  .toc a{border:0;border-left:2px solid var(--line);border-radius:0;padding:.3rem 0 .3rem .9rem}
  .toc a:hover{color:var(--ink)}
  .toc a.on{border-left-color:var(--accent)}
}
main{max-width:40rem;min-width:0}
main h1{margin:0 0 1rem;font-family:"Hiragino Mincho ProN","Yu Mincho","Noto Serif JP",serif;font-size:1.55rem;line-height:1.6;scroll-margin-top:1rem}
main h2{margin:3rem 0 .5rem;font-family:"Hiragino Mincho ProN","Yu Mincho","Noto Serif JP",serif;font-size:1.3rem;line-height:1.5;scroll-margin-top:1rem}
main h2::before{content:"";display:block;width:2.2rem;height:3px;background:var(--accent);margin-bottom:.7rem}
main p{margin:.4rem 0 1rem;color:var(--sub)}
#privacypolicy{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:1.2rem 1.5rem;margin:4rem 0 2rem;font-size:.88rem;line-height:1.9}
#privacypolicy h1{font-size:1.2rem}
#privacypolicy h2{font-size:1rem;margin:1.6rem 0 .2rem}
#privacypolicy h2::before{display:none}
footer.site{border-top:1px solid var(--line);padding:1.5rem 0 3rem;color:var(--sub);font-size:.9rem}