:root{--bg:#05070f;--ink:#e9ecf4;--muted:#9aa2b8;--faint:#6f7892;--line:rgba(255,255,255,.10);--card:rgba(18,22,34,.66);--card2:rgba(255,255,255,.03);--accent:#bfd4ff;--accent-bg:rgba(124,160,255,.14);--accent-line:rgba(140,170,255,.45);--maxw:920px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;background:var(--bg)}
body{margin:0;min-height:100dvh;color:var(--ink);font-family:"Outfit","Noto Sans","Segoe UI",system-ui,sans-serif;background:radial-gradient(60% 45% at 50% -8%,rgba(124,160,255,.10),transparent 60%),radial-gradient(circle at 50% -22%,#10172a 0%,#05070f 42%,#010102 100%) fixed;-webkit-font-smoothing:antialiased}
a{color:var(--accent)}
.lh{position:sticky;top:0;z-index:10;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;padding:12px clamp(16px,4vw,40px);background:linear-gradient(rgba(5,7,15,.92),rgba(5,7,15,.6) 70%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
.back{display:inline-flex;align-items:center;height:40px;padding:0 15px;border-radius:13px;border:1px solid var(--line);background:rgba(255,255,255,.04);color:var(--ink);text-decoration:none;font-weight:600;font-size:14.5px}
.back:hover{background:rgba(255,255,255,.09)}
.langs{display:inline-flex;flex-wrap:wrap;gap:4px;padding:4px;border:1px solid var(--line);border-radius:13px;background:rgba(255,255,255,.03)}
.langs a{padding:6px 11px;border-radius:9px;color:var(--muted);text-decoration:none;font-size:13.5px;font-weight:600}
.langs a:hover{color:var(--ink)}
.langs a[aria-current]{color:var(--ink);background:rgba(255,255,255,.10)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:10px clamp(16px,4vw,40px) 60px}
.crumbs{margin:6px 0 16px;color:var(--faint);font-size:13.5px}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--ink)}
h1{font-family:"Cinzel",serif;font-weight:700;font-size:clamp(1.7rem,5.5vw,2.5rem);line-height:1.15;margin:0 0 12px}
html[lang=zh] h1,html[lang=ar] h1{font-family:inherit}
.lead{color:var(--muted);font-size:clamp(1rem,2.6vw,1.1rem);line-height:1.6;margin:0 0 20px;max-width:65ch}
.buttons{display:flex;flex-wrap:wrap;gap:9px;margin:0 0 26px}
.btn{display:inline-flex;align-items:center;min-height:44px;padding:9px 18px;border-radius:12px;border:1px solid var(--accent-line);background:var(--accent-bg);color:var(--accent);font-weight:600;font-size:14.5px;text-decoration:none;transition:background .16s}
.btn:hover{background:rgba(124,160,255,.24)}
.btn.quiet{border-color:var(--line);background:var(--card2);color:var(--ink)}
.toc{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 30px;padding:0;list-style:none}
.toc a{display:inline-block;padding:9px 14px;border:1px solid var(--line);border-radius:11px;background:var(--card2);color:var(--muted);font-weight:600;font-size:13.5px;text-decoration:none}
.toc a:hover{color:var(--ink);background:rgba(255,255,255,.06)}
.group{margin:0 0 34px;scroll-margin-top:84px}
h2{font-size:clamp(1.2rem,3.4vw,1.5rem);margin:0 0 12px;line-height:1.25}
details{border:1px solid var(--line);background:var(--card);border-radius:14px;margin:0 0 8px;scroll-margin-top:84px}
summary{cursor:pointer;padding:14px 18px;list-style-position:inside}
summary h3{display:inline;font-size:15.5px;font-weight:600;line-height:1.45;margin:0}
details>p{margin:0;padding:0 18px 12px;color:#d6dae6;font-size:15.5px;line-height:1.68}
details>p.via{color:var(--muted);font-size:14.5px;padding-bottom:16px}
.group .btn{margin-top:8px}
.note{color:var(--faint);font-size:13.5px;line-height:1.6;margin:26px 0}
.doc{border:1px solid var(--line);background:var(--card);border-radius:20px;padding:clamp(20px,4.5vw,42px);margin:0 0 24px}
.answer{font-size:clamp(1.02rem,2.6vw,1.14rem);line-height:1.65;margin:0 0 22px;color:var(--ink);padding-inline-start:14px;border-inline-start:3px solid var(--accent-line)}
.doc h2{margin:26px 0 10px}
.doc p{color:#d6dae6;font-size:16px;line-height:1.72;margin:0 0 14px}
footer{border-top:1px solid var(--line);margin-top:30px;padding:20px 0 0;text-align:center;color:var(--faint);font-size:12.5px;line-height:1.7}
footer p{margin:10px 0 0}