:root{color-scheme:dark;--bg:#0a1020;--panel:#111b31;--line:#27354f;--text:#eaf2fc;--sub:#a8b8d1;--accent:#6ee7f9;--gold:#ffcc85;--max:1160px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,"Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;line-height:1.75}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline} .sitebar{min-height:64px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:10px max(22px,calc((100vw - var(--max))/2));gap:18px}.sitebar>a{color:var(--text);font-size:13px;letter-spacing:2px;font-weight:800}.sitebar nav{display:flex;gap:22px;flex-wrap:wrap}.sitebar nav a{color:var(--sub);font-size:13px}.container{max-width:var(--max);padding:0 24px;margin:0 auto}
.hero{max-width:var(--max);padding:100px 24px 85px;margin:auto;min-height:480px;position:relative;overflow:hidden}.hero h1{font-weight:850;font-size:clamp(38px,6vw,78px);line-height:1.2;letter-spacing:-.04em;margin:12px 0 25px;position:relative;z-index:1}.hero h1 span{color:var(--accent)}.eyebrow,.reader-meta{color:var(--gold);letter-spacing:2px;font-size:12px;font-weight:700}.lead{font-size:17px;max-width:760px;color:var(--sub);position:relative;z-index:1}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px;position:relative;z-index:1}.btn{display:inline-flex;align-items:center;justify-content:space-between;gap:25px;padding:12px 19px;border-radius:9px;font-weight:700;font-size:14px;max-width:100%;border:1px solid var(--line)}.btn.primary{background:var(--accent);color:#0b1728;border-color:var(--accent)}.btn.outline{color:var(--text);background:#172139}.btn:hover{text-decoration:none;filter:brightness(1.06)}.hero-visual{position:absolute;right:-10px;top:96px;width:365px;opacity:.49;pointer-events:none}.hero-visual svg{width:100%}.hero-visual span{font:11px ui-monospace,monospace;color:var(--sub)}.section-top h2,.reference h2,.footer-note h2{font-size:clamp(25px,3vw,36px);margin:8px 0}.section-top p,.reference p,.footer-note p{color:var(--sub);max-width:720px}.chapter-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:30px 0 95px}.chapter{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:28px}.chapter.available{border-color:#375977}.chapter-head{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:var(--gold);font-weight:700}.chapter .tag{color:var(--accent)}.chapter h3{font-size:24px;margin:15px 0 8px}.chapter p{color:var(--sub);margin-top:0}.chapter-links{display:flex;flex-wrap:wrap;gap:15px;margin-top:20px}.chapter-links a{font-size:14px;font-weight:700}.upcoming{opacity:.79}.reference{background:#15233a;padding:65px 0}.ref-grid{display:grid;grid-template-columns:1fr auto;gap:25px;align-items:center}.ref-actions{display:flex;flex-direction:column;gap:10px}.footer-note{padding-top:55px;padding-bottom:60px}.foot{border-top:1px solid var(--line);padding:20px 24px;text-align:center;color:var(--sub);font-size:12px}
.reader{width:min(860px,calc(100% - 40px));margin:48px auto 100px;line-height:1.95}.reader h1{font-size:clamp(29px,4vw,43px);line-height:1.4;margin:12px 0 25px}.reader h2{font-size:26px;border-bottom:1px solid var(--line);padding-bottom:8px;margin:54px 0 22px}.reader h3{font-size:20px;margin:32px 0 10px}.reader p,.reader li{font-size:16px}.reader blockquote{border-left:4px solid var(--accent);background:#142138;padding:10px 18px;margin:22px 0;color:#deecfb}.reader pre{overflow:auto;background:#101c30;border:1px solid var(--line);border-radius:10px;padding:18px;line-height:1.55;font-size:13px;white-space:pre}.reader code{font:0.88em ui-monospace,SFMono-Regular,Consolas,monospace;background:#253149;color:#eaf2fc;padding:2px 4px;border-radius:3px}.reader pre code{padding:0;background:none}.reader .math-block{overflow-x:auto;padding:20px 8px;margin:25px 0;text-align:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:16px;white-space:pre-wrap}.reader li{margin:6px 0}.reader-end{display:flex;flex-wrap:wrap;gap:18px;padding:30px 0;margin-top:55px;border-top:1px solid var(--line);font-weight:700}
@media(max-width:760px){.sitebar{align-items:flex-start;flex-direction:column}.sitebar nav{gap:15px}.hero{padding-top:65px;min-height:0}.hero-visual{position:static;width:250px;max-width:90%;margin:25px auto -10px}.chapter-grid,.ref-grid{grid-template-columns:1fr}.chapter{padding:21px}.reference{padding:45px 0}.ref-actions{align-items:flex-start}.reader{margin-top:30px}.reader pre{font-size:12px}}