:root{
  --ink:#0a0a0a;
  --ink-soft:#6b6b6b;
  --bg:#ffffff;
  --bg-soft:#f7f7f7;
  --border:#e5e5e5;
  --border-strong:#d4d4d4;
  --accent:#0a0a0a;
  --mark:#ffe89e;
  --font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --nav-h:64px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;line-height:1.65;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul,ol{margin:0;padding:0}

/* ---------- Header ---------- */
.doc-nav{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--border);
}
.doc-nav__inner{
  display:flex;align-items:center;gap:20px;height:var(--nav-h);
  max-width:1280px;margin:0 auto;padding:0 24px;
}
.doc-nav__logo img{height:24px;width:auto}

/* search */
.doc-search{
  position:relative;flex:1;max-width:520px;display:flex;align-items:center;
}
.doc-search__icon{
  position:absolute;left:14px;width:18px;height:18px;color:var(--ink-soft);pointer-events:none;
}
.doc-search input{
  width:100%;height:42px;border:1px solid var(--border);border-radius:10px;
  padding:0 76px 0 42px;font-family:inherit;font-size:15px;color:var(--ink);background:var(--bg-soft);
  outline:none;transition:border-color .15s ease,background .15s ease;
}
.doc-search input:focus{border-color:var(--ink);background:#fff}
.doc-search input::-webkit-search-cancel-button{display:none}
.doc-search__count{
  position:absolute;right:38px;font-size:12px;color:var(--ink-soft);white-space:nowrap;
}
.doc-search__clear{
  position:absolute;right:12px;border:none;background:none;color:var(--ink-soft);
  cursor:pointer;font-size:14px;line-height:1;padding:4px;
}
.doc-search__clear:hover{color:var(--ink)}

/* language selector */
.doc-lang{position:relative}
.doc-lang__btn{
  display:flex;align-items:center;gap:8px;height:42px;padding:0 12px;
  border:1px solid var(--border);border-radius:10px;background:#fff;cursor:pointer;
  font-family:inherit;font-size:14px;font-weight:500;color:var(--ink);
}
.doc-lang__btn:hover{border-color:var(--border-strong)}
.doc-lang__flag{font-size:16px;line-height:1;display:inline-flex}
.doc-lang__flag img{width:20px;height:15px;border-radius:2px}
.doc-lang__menu{
  position:absolute;top:calc(100% + 8px);right:0;min-width:190px;z-index:60;
  background:#fff;border:1px solid var(--border);border-radius:12px;padding:6px;
  box-shadow:0 12px 32px rgba(0,0,0,.10);list-style:none;
}
.doc-lang__menu li{
  display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;
  cursor:pointer;font-size:14px;
}
.doc-lang__menu li:hover{background:var(--bg-soft)}
.doc-lang__menu li[aria-selected="true"]{font-weight:600}
.doc-lang__menu li[aria-selected="true"]::after{content:"✓";margin-left:auto;color:var(--ink)}
.doc-lang__menu img{width:20px;height:15px;border-radius:2px}

/* toc toggle (mobile) */
.doc-toc-toggle{
  display:none;flex-direction:column;gap:4px;background:none;border:none;cursor:pointer;padding:6px;
}
.doc-toc-toggle span{width:22px;height:2px;background:var(--ink);border-radius:2px}

/* ---------- Layout ---------- */
.doc-layout{
  max-width:1280px;margin:0 auto;padding:0 24px;
  display:grid;grid-template-columns:250px minmax(0,1fr);gap:56px;align-items:start;
}

/* TOC */
.doc-toc{
  position:sticky;top:calc(var(--nav-h) + 28px);align-self:start;
  max-height:calc(100vh - var(--nav-h) - 48px);overflow-y:auto;
  padding:36px 0 40px;
}
.doc-toc__title{
  font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;
  color:var(--ink-soft);margin:0 0 14px;
}
.doc-toc a{
  display:block;padding:6px 12px;font-size:13.5px;color:var(--ink-soft);
  border-left:2px solid var(--border);line-height:1.4;transition:color .12s ease,border-color .12s ease;
}
.doc-toc a:hover{color:var(--ink)}
.doc-toc a.is-active{color:var(--ink);font-weight:600;border-left-color:var(--ink)}

/* ---------- Content ---------- */
.doc-content{padding:44px 0 96px;min-width:0}
.doc-article{max-width:760px}
.doc-loading{color:var(--ink-soft);padding:40px 0}

.doc-article h1{
  font-size:clamp(28px,4vw,38px);font-weight:700;letter-spacing:-.02em;margin:0 0 40px;line-height:1.15;
}
.doc-article h2{
  font-size:26px;font-weight:700;letter-spacing:-.01em;margin:56px 0 16px;
  padding-top:34px;border-top:1px solid var(--border);scroll-margin-top:calc(var(--nav-h) + 20px);
}
.doc-article h2:first-of-type{border-top:none;padding-top:0;margin-top:0}
.doc-article h3{font-size:18px;font-weight:600;margin:32px 0 10px;scroll-margin-top:calc(var(--nav-h) + 20px)}
.doc-article p{margin:0 0 16px;color:#2a2a2a}
.doc-article ul,.doc-article ol{margin:0 0 18px;padding-left:24px}
.doc-article li{margin-bottom:8px;color:#2a2a2a}
.doc-article li>ul,.doc-article li>ol{margin:8px 0 4px}
.doc-article strong{color:var(--ink);font-weight:600}
.doc-article a{color:var(--ink);text-decoration:underline;text-underline-offset:2px;text-decoration-color:var(--border-strong)}
.doc-article a:hover{text-decoration-color:var(--ink)}
.doc-article code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.88em;
  background:var(--bg-soft);border:1px solid var(--border);border-radius:5px;padding:1px 6px;
}
.doc-article hr{border:none;height:0;margin:0}

/* heading anchor link */
.doc-anchor{
  margin-left:8px;color:var(--border-strong);opacity:0;text-decoration:none;font-weight:400;
  transition:opacity .12s ease;
}
.doc-article h2:hover .doc-anchor,
.doc-article h3:hover .doc-anchor{opacity:1}
.doc-anchor:hover{color:var(--ink)}

/* tables */
.doc-table-wrap{overflow-x:auto;margin:0 0 22px}
.doc-article table{border-collapse:collapse;width:100%;font-size:14.5px}
.doc-article th,.doc-article td{
  text-align:left;padding:10px 14px;border:1px solid var(--border);vertical-align:top;
}
.doc-article th{background:var(--bg-soft);font-weight:600}

/* search highlight & filtering */
mark{background:var(--mark);color:inherit;border-radius:2px;padding:0 1px}
.doc-hidden{display:none !important}
.doc-noresults{color:var(--ink-soft);padding:20px 0;font-size:15px}

.doc-updated{
  max-width:760px;margin:48px 0 0;padding-top:20px;border-top:1px solid var(--border);
  font-size:13px;color:var(--ink-soft);
}

/* back to top */
.doc-top{
  position:fixed;right:24px;bottom:24px;z-index:40;width:44px;height:44px;
  border-radius:50%;border:1px solid var(--border);background:#fff;color:var(--ink);
  cursor:pointer;display:flex;align-items:center;justify-content:center;
  box-shadow:0 6px 20px rgba(0,0,0,.10);transition:opacity .2s ease,transform .2s ease;
}
.doc-top:hover{transform:translateY(-2px)}
.doc-top[hidden]{display:none}

.doc-toc-backdrop{
  position:fixed;inset:0;z-index:45;background:rgba(0,0,0,.35);
}
.doc-toc-backdrop[hidden]{display:none}

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .doc-layout{grid-template-columns:1fr;gap:0}
  .doc-toc-toggle{display:flex}
  .doc-toc{
    position:fixed;top:var(--nav-h);left:0;bottom:0;z-index:46;width:280px;max-width:82vw;
    max-height:none;background:#fff;border-right:1px solid var(--border);
    padding:24px 20px;transform:translateX(-102%);transition:transform .22s ease;
  }
  .doc-toc.is-open{transform:translateX(0)}
  .doc-content{padding-top:32px}
}

@media (max-width:640px){
  .doc-nav__inner{gap:12px;padding:0 16px}
  .doc-lang__label{display:none}
  .doc-search input{font-size:16px}
  .doc-layout{padding:0 16px}
}