:root{--bg:#f7f8fc;--ink:#1d2340;--ink-2:#4a5275;--muted:#6d7494;--link:#4b3cc9;--link-h:#2f2395;--bar:#191d38;--bar-ink:#eceefa;--bar-hi:#2c3160;--accent:#18b4a3;--accent-ink:#0d1f1d;--line:#e0e3ef;--soft:#eef0fa;--card:#ffffff;--foot:#191d38;--foot-ink:#c8cce4;--hfont:'Avenir Next', 'Segoe UI', system-ui, sans-serif}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 var(--font,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif)}
a{color:var(--link)}a:hover{color:var(--link-h,var(--link))}
img{max-width:100%;height:auto}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:10px;top:10px;background:#fff;color:#000;padding:8px;z-index:9}
.topbar{background:var(--bar);color:var(--bar-ink);position:sticky;top:0;z-index:5;box-shadow:0 1px 0 var(--line)}
.bar{display:flex;align-items:center;gap:16px;min-height:62px}
.logo{display:flex;align-items:center;gap:10px;color:var(--bar-ink);text-decoration:none;font-weight:700;font-size:1.12rem;letter-spacing:.01em}
.logo svg{width:34px;height:34px;flex:none}
.mainnav{margin-left:auto}.mainnav ul{display:flex;gap:4px;list-style:none;margin:0;padding:0;flex-wrap:wrap}
.mainnav a{display:block;padding:8px 12px;border-radius:8px;color:var(--bar-ink);text-decoration:none;font-size:.95rem}
.mainnav a:hover,.mainnav a[aria-current=page]{background:var(--bar-hi)}
.mainnav .langsw a{border:1px solid var(--bar-ink);opacity:.9;font-size:.85rem;padding:6px 10px;margin-left:6px}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--bar-ink);color:var(--bar-ink);border-radius:8px;padding:6px 12px;font:inherit}
@media(max-width:860px){.menu-btn{display:block}.mainnav{display:none;position:absolute;left:0;right:0;top:62px;background:var(--bar);padding:8px 16px 16px}
.mainnav.open{display:block}.mainnav ul{flex-direction:column}}
.home-hero{position:relative;color:#fff;min-height:440px;display:flex;align-items:flex-end;overflow:hidden;background:#111}
.home-hero img.bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.62}
.home-hero .wrap{position:relative;padding-top:90px;padding-bottom:56px;width:100%}
.home-hero h1{font-size:clamp(2rem,5vw,3.3rem);line-height:1.12;margin:.2em 0;max-width:16em;font-family:var(--hfont,inherit)}
.home-hero .lede{color:#fff;font-size:1.2rem;max-width:36em;text-shadow:0 1px 3px rgba(0,0,0,.5)}
.kicker{text-transform:uppercase;letter-spacing:.12em;font-size:.82rem;font-weight:700;color:var(--accent-on-dark,#ffd27a)}
.btn{display:inline-block;background:var(--accent);color:var(--accent-ink);padding:12px 20px;border-radius:10px;text-decoration:none;font-weight:700;border:0;font:inherit;font-weight:700;cursor:pointer}
.btn:hover{filter:brightness(1.08);color:var(--accent-ink)}.btn.ghost{background:transparent;color:#fff;box-shadow:inset 0 0 0 2px #fff}
main{padding-bottom:40px}
.crumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:20px 0 0;font-size:.88rem;color:var(--muted)}
.crumbs li+li:before{content:"›";margin-right:6px}.crumbs a{color:var(--muted)}
.page-head h1{font-size:clamp(1.8rem,4vw,2.6rem);line-height:1.15;margin:.4em 0 .2em;font-family:var(--hfont,inherit)}
.lede{font-size:1.15rem;color:var(--ink-2)}
.hero{margin:20px 0}.hero img{border-radius:14px;width:100%;max-height:460px;object-fit:cover}
.layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:40px}
.layout.notoc{grid-template-columns:minmax(0,1fr)}
@media(max-width:900px){.layout{grid-template-columns:minmax(0,1fr)}}
.toc{position:sticky;top:80px;align-self:start;font-size:.92rem;border-left:3px solid var(--accent);padding-left:14px}
.toc p{font-weight:700;margin:0 0 6px}.toc ol{margin:0;padding-left:18px}.toc a{color:var(--ink-2)}
@media(max-width:900px){.toc{position:static}}
.prose{max-width:46em}.prose h2{font-size:1.5rem;margin:1.6em 0 .4em;font-family:var(--hfont,inherit);scroll-margin-top:80px}
.prose h3{font-size:1.15rem;margin:1.3em 0 .3em}
.wide .prose{max-width:none}
table{border-collapse:collapse;width:100%;font-size:.95rem}th,td{border-bottom:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
th{background:var(--soft)}.tablewrap{overflow-x:auto;margin:1em 0}
.note{background:var(--soft);border-left:4px solid var(--accent);padding:12px 16px;border-radius:0 10px 10px 0;margin:1.2em 0}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:1em 0}
.card{display:block;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;text-decoration:none;color:var(--ink);transition:transform .15s}
.card:hover{transform:translateY(-2px);color:var(--ink)}.card strong{display:block;font-size:1.08rem;margin-bottom:4px;color:var(--link)}
.card span{color:var(--ink-2);font-size:.94rem}.card img{border-radius:10px;margin-bottom:10px;aspect-ratio:16/9;object-fit:cover;width:100%}
.home section{margin:46px 0}.home h2{font-size:1.75rem;font-family:var(--hfont,inherit);margin-bottom:.3em}
.related{margin-top:48px}.related h2{font-family:var(--hfont,inherit)}
details.faq{border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin:8px 0;background:var(--card)}
details.faq summary{cursor:pointer;font-weight:650}
.foot{background:var(--foot);color:var(--foot-ink);padding:40px 0 20px;margin-top:40px;font-size:.94rem}
.foot a{color:var(--foot-ink)}.foot .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:28px}
.foot h2{font-size:.95rem;text-transform:uppercase;letter-spacing:.08em;margin:0 0 8px}
.foot ul{list-style:none;padding:0;margin:0}.foot li{margin:4px 0}.small{font-size:.85rem;opacity:.8}
@media(max-width:760px){.foot .cols{grid-template-columns:1fr 1fr}}
.tool{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;margin:1.4em 0}
.tool label{display:block;font-weight:650;font-size:.92rem;margin:.6em 0 .2em}
.tool input,.tool select,.tool textarea{width:100%;font:inherit;padding:9px 11px;border:1px solid var(--line);border-radius:9px;background:var(--bg);color:var(--ink)}
.tool .row{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
.out{font-size:1.05rem;margin-top:14px}.out b{font-size:1.3rem}
.tool label{display:flex;flex-direction:column;gap:4px;font-size:.92rem;color:var(--ink-2)}
.tool input{font:inherit;padding:.45rem .6rem;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink)}
.out code{font-size:1rem;word-break:break-all}
.out .btn{margin-left:8px;padding:.35rem .9rem}