:root{
  --bg:#faf8f5;--surface:#ffffff;--text:#1b1b1b;--muted:#5f5a54;--line:#e8e2d9;
  --accent:#e8622a;--link:#a3410f;--btn:#b8461a;--btn-text:#ffffff;
  --chip:#f6e6dc;--chip-text:#7a2f0b;
  --shadow:0 1px 2px rgba(0,0,0,.06),0 10px 28px rgba(0,0,0,.10);
  --radius:12px;
  --font:system-ui,-apple-system,"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Noto Sans CJK JP","Yu Gothic UI","Meiryo",sans-serif;
  color-scheme:light dark;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#121212;--surface:#1b1b1b;--text:#ededed;--muted:#a8a8a8;--line:#2e2e2e;
    --accent:#e8622a;--link:#ff9a62;--btn:#e8622a;--btn-text:#141414;
    --chip:#3a2418;--chip-text:#ffc4a3;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 28px rgba(0,0,0,.5);
  }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.8;overflow-wrap:anywhere}
@media (min-width:800px){body{font-size:17px}}
a{color:var(--link);text-underline-offset:.2em}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
img{max-width:100%;height:auto}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
@media (min-width:800px){.wrap{padding:0 24px}}
.skip{position:absolute;left:-9999px;top:0}
.skip:focus{left:16px;top:8px;background:var(--surface);color:var(--text);padding:8px 12px;z-index:10}

.site-header{background:var(--surface);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:4px 16px;min-height:56px;padding-top:6px;padding-bottom:6px}
.brand{display:inline-flex;align-items:center;gap:8px;font-weight:700;color:var(--text);text-decoration:none}
.brand img{width:24px;height:24px}
.site-nav{display:flex;flex-wrap:wrap;gap:4px 18px;font-size:.92em}
.site-nav a{color:var(--text);text-decoration:none}
.site-nav a:hover,.site-nav a[aria-current]{text-decoration:underline}

.crumbs ol{list-style:none;margin:16px 0 0;padding:0;display:flex;flex-wrap:wrap;font-size:.85em;color:var(--muted)}
.crumbs li+li::before{content:"›";margin:0 8px}
.crumbs a{color:var(--muted)}

h1,h2,h3{line-height:1.4;font-feature-settings:"palt";word-break:auto-phrase}
h1{font-size:clamp(2rem,7vw,3.1rem);line-height:1.2;margin:.25em 0 .35em}
h2{font-size:clamp(1.35rem,3.6vw,1.75rem);margin:0 0 .8em}
h3{font-size:1.1rem;margin:1.8em 0 .6em}
p{margin:0 0 1em}
section{padding:44px 0;border-top:1px solid var(--line)}

.hero{display:grid;gap:24px;padding:24px 0 44px}
@media (min-width:800px){.hero{grid-template-columns:280px 1fr;gap:48px;align-items:start;padding:40px 0 56px}}
.hero.simple{display:block;padding:32px 0 28px}
.cover{margin:0;justify-self:center}
.cover img{display:block;width:200px;border-radius:6px;box-shadow:var(--shadow)}
@media (min-width:800px){.cover img{width:280px}}
.series{display:inline-block;margin:0;padding:2px 12px;border-radius:999px;background:var(--chip);color:var(--chip-text);font-size:.82em;font-weight:700}
.subtitle{margin:0 0 1.4em;color:var(--muted);font-size:.95em;line-height:1.75}
.facts{display:grid;gap:8px;margin:0 0 1.6em}
.facts div{display:grid;grid-template-columns:6.5em 1fr;gap:12px}
.facts dt{color:var(--muted);font-size:.9em;padding-top:.08em}
.facts dd{margin:0}
@media (max-width:559px){.facts div{grid-template-columns:1fr;gap:0}.facts dt{font-size:.82em}}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin:0 0 1.1em}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:10px 22px;border-radius:10px;background:var(--btn);color:var(--btn-text);font-weight:700;text-decoration:none;line-height:1.4}
.button:hover{filter:brightness(1.08)}
.button.ghost{background:transparent;color:var(--link);box-shadow:inset 0 0 0 1.5px currentColor}
.note{color:var(--muted);font-size:.85em}

.onpage{margin:0;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:6px 18px;font-size:.92em}
.onpage-wrap{padding:20px 0;border-top:1px solid var(--line)}
.onpage-wrap h2{font-size:.9rem;color:var(--muted);margin:0 0 .5em;font-weight:700}

.lead{font-size:1.06em}
.muted{color:var(--muted);font-size:.9em}
.grid{display:grid;gap:14px}
@media (min-width:720px){.grid.two{grid-template-columns:repeat(2,1fr)}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}
.card h3{margin:0 0 .35em;font-size:1.02rem}
.card p{margin:0}
.list{margin:0;padding-left:1.3em}
.list li+li{margin-top:.45em}

.toc{columns:1;column-gap:16px}
@media (min-width:760px){.toc{columns:2}}
.part{display:inline-block;width:100%;margin:0 0 14px;break-inside:avoid}
.part h3{margin:0 0 .4em;font-size:1rem}
.part ol{list-style:none;margin:0;padding:0}
.part li{display:grid;grid-template-columns:4.6em 1fr;gap:6px;padding:5px 0;border-top:1px dashed var(--line);font-size:.92em;line-height:1.65}
.part li:first-child{border-top:0}
.part li.single{display:block}
.no{color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}

.ed{display:flex;flex-direction:column}
.ed.latest{border:2px solid var(--accent)}
.ed h3 .badge{margin-left:8px}
.badge{display:inline-block;padding:1px 9px;border-radius:999px;background:var(--accent);color:#141414;font-size:.72em;font-weight:700;vertical-align:.12em}
.ed dl{display:grid;grid-template-columns:auto 1fr;gap:4px 14px;margin:.5em 0 1em}
.ed dt{color:var(--muted);font-size:.88em}
.ed dd{margin:0;font-variant-numeric:tabular-nums}
.ed .ed-note{font-size:.9em;margin:0 0 1em}
.ed .more{margin-top:auto}

.timeline{list-style:none;margin:0;padding:0 0 0 4px}
.timeline li{position:relative;padding:0 0 18px 24px;border-left:2px solid var(--line)}
.timeline li:last-child{padding-bottom:0}
.timeline li::before{content:"";position:absolute;left:-7px;top:.5em;width:12px;height:12px;border-radius:50%;background:var(--accent)}
.timeline time{display:block;font-weight:700;font-variant-numeric:tabular-nums}

.faq h3{margin:1.6em 0 .4em}
.faq h3:first-child{margin-top:0}
.faq p{margin:0}

.related{list-style:none;margin:0;padding:0;display:grid;gap:14px}
@media (min-width:720px){.related{grid-template-columns:repeat(2,1fr)}}
.related .card a{font-weight:700}
.related .card p{margin-top:.35em;font-size:.93em}

.feature{display:grid;gap:24px;align-items:start}
@media (min-width:760px){.feature{grid-template-columns:220px 1fr;gap:40px}}
.feature .cover img{width:180px}
@media (min-width:760px){.feature .cover img{width:220px}}
.feature h2{margin-bottom:.3em}

.site-footer{margin-top:8px;padding:32px 0 48px;border-top:1px solid var(--line);color:var(--muted);font-size:.85em}
.site-footer p{margin:.5em 0}