:root{--bg:#fbfaf7;--fg:#222;--muted:#777;--line:#e6e2da;--accent:#1a73e8;--mark:#ffe08a;--card:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#16181b;--fg:#e8e6e1;--muted:#9a9a9a;--line:#2c2f34;--accent:#8ab4f8;--mark:#7a5c00;--card:#1d2024}}
*{box-sizing:border-box}
html{scroll-padding-top:4.2rem}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.85 -apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP","Yu Gothic UI",sans-serif}
a{color:var(--accent);text-decoration:none}
header.bar{position:sticky;top:0;z-index:5;background:var(--bg);border-bottom:1px solid var(--line);padding:.5rem 1rem;display:flex;gap:.6rem;align-items:center;flex-wrap:wrap}
header.bar .title{font-weight:700;margin-right:auto}
header.bar a{font-size:.9rem}
nav.toc{max-width:46rem;margin:1rem auto 0;padding:0 1rem;display:flex;flex-wrap:wrap;gap:.4rem}
nav.toc a{font-size:.85rem;border:1px solid var(--line);border-radius:999px;padding:.15rem .7rem;background:var(--card)}
main{max-width:46rem;margin:0 auto;padding:1rem 1rem 6rem}
h1{font-size:1.4rem;margin:.6rem 0 0}
.meta{color:var(--muted);font-size:.9rem}
section{margin-top:2.2rem}
h2{font-size:1.15rem;border-left:4px solid var(--accent);padding-left:.6rem;margin:0 0 .8rem}
.txt{white-space:pre-wrap;overflow-wrap:anywhere}
article.qa{border-top:1px dashed var(--line);padding-top:.6rem;margin-top:.8rem}
article.qa .qno{font-weight:700;color:var(--accent)}
.qjump{display:flex;flex-wrap:wrap;gap:.3rem;margin:.2rem 0 1rem}
.qjump a{font-size:.8rem;border:1px solid var(--line);border-radius:6px;padding:0 .45rem;background:var(--card)}
details.pre{margin-top:1.2rem;color:var(--muted)}
details.pre summary{cursor:pointer}
mark{background:var(--mark);color:inherit;border-radius:3px;padding:0 .1em}
mark.current{outline:2px solid #f29900}
.target{animation:flash 2.2s ease-out 1}
@keyframes flash{0%{background:rgba(26,115,232,.18)}100%{background:transparent}}
.pager{display:flex;justify-content:space-between;margin-top:3rem;font-size:.95rem}
ul.issues{list-style:none;padding:0}
ul.issues li{padding:.35rem 0;border-bottom:1px solid var(--line)}
ul.issues .where{color:var(--muted);font-size:.88rem;margin-left:.4rem}
h2.year{margin-top:2rem}