:root{--bg:#fbf8f7;--fg:#2e2a2b;--muted:#6f6668;--accent:#9b5a6b;--line:#e8dfe1}
@media (prefers-color-scheme:dark){:root{--bg:#1d1a1b;--fg:#ece6e7;--muted:#a99fa2;--accent:#d49aab;--line:#3a3436}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.75 system-ui,-apple-system,"Segoe UI",Roboto,"Hiragino Sans","Noto Sans JP",sans-serif}
.wrap{max-width:42rem;margin:0 auto;padding:0 16px}
header.site{border-bottom:1px solid var(--line);padding:18px 0}
header.site .wrap{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.brand{font-weight:600;letter-spacing:.08em;color:var(--fg);text-decoration:none}
main{padding:32px 0 56px}
h1{font-size:1.7rem;line-height:1.3;margin:0 0 .4em}
h2{font-size:1.15rem;margin:2em 0 .5em;padding-bottom:.3em;border-bottom:1px solid var(--line)}
p,ul{margin:.8em 0}
ul{padding-left:1.4em}
li{margin:.25em 0}
a{color:var(--accent);text-underline-offset:2px;overflow-wrap:anywhere}
.meta{color:var(--muted);font-size:.9rem}
footer.site{border-top:1px solid var(--line);padding:20px 0;color:var(--muted);font-size:.9rem}
footer.site a{color:var(--muted)}
nav.lang{display:flex;gap:12px;font-size:.9rem}
nav.lang .cur{color:var(--muted)}
nav.lang a{color:var(--accent)}
details{border-bottom:1px solid var(--line)}
summary{cursor:pointer;list-style:none;padding:14px 28px 14px 0;font-weight:600;position:relative;line-height:1.5}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:4px;top:12px;font-weight:400;font-size:1.3rem;color:var(--muted)}
details[open] summary::after{content:"\2212"}
.ans{padding:0 0 14px}
.ans p:first-child{margin-top:0}