:root{
  --blue-50:#eef6ff;--blue-100:#dbeafe;--blue-400:#5aa9ff;--blue-600:#1b74e4;--blue-700:#155cbb;
  --ink:#0e1726;--ink-2:#3d4a5c;--muted:#6b7787;--line:#e7ecf3;--bg:#fff;--bg-soft:#f6f9fe;
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button{font:inherit}
img,video,iframe{display:block;max-width:100%;height:auto}
:where(a,button,summary):focus-visible{outline:3px solid rgba(27,116,228,.28);outline-offset:3px}
.wrap{width:min(100% - 40px,920px);margin:0 auto}
.site-header{position:sticky;top:10px;z-index:20;width:min(calc(100% - 24px),964px);margin:10px auto 0;background:rgba(250,252,255,.74);-webkit-backdrop-filter:blur(24px) saturate(170%);backdrop-filter:blur(24px) saturate(170%);border:1px solid rgba(255,255,255,.82);border-radius:18px;box-shadow:inset 0 1px 0 rgba(255,255,255,.95),0 12px 38px rgba(25,64,117,.1)}
.site-nav{width:100%;height:64px;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:0 16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.018em;-webkit-tap-highlight-color:transparent}
.brand-mark{width:36px;height:36px;display:grid;place-items:center;border-radius:11px;background:linear-gradient(150deg,var(--blue-400),var(--blue-600));color:#fff;font-size:12px;box-shadow:inset 0 1px 0 rgba(255,255,255,.42),0 5px 14px rgba(27,116,228,.22);transition:transform .32s cubic-bezier(.16,1,.3,1)}
.brand-mark svg{width:21px;height:21px}
.brand:hover .brand-mark{transform:rotate(-4deg) scale(1.04)}
.brand strong{color:var(--blue-600)}
.nav-actions{display:flex;align-items:center;gap:10px}
.back{display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:700;color:var(--ink-2);min-height:40px;padding:8px 14px;border:1px solid rgba(42,73,117,.12);border-radius:999px;background:rgba(255,255,255,.74);box-shadow:inset 0 1px 0 rgba(255,255,255,.92);transition:transform .32s cubic-bezier(.16,1,.3,1),color .18s ease,border-color .18s ease,background .18s ease;-webkit-tap-highlight-color:transparent}
.back::before{content:"←";font-size:15px;line-height:1;transition:transform .32s cubic-bezier(.16,1,.3,1)}
.back:hover{color:var(--blue-700);border-color:var(--blue-200);background:#fff;transform:translateY(-1px)}
.back:hover::before{transform:translateX(-2px)}
.back:active{transform:scale(.97);transition-duration:.08s}
.lang{display:flex;padding:3px;border-radius:999px;background:rgba(231,237,246,.78);border:1px solid rgba(42,73,117,.1);box-shadow:inset 0 1px 2px rgba(24,56,100,.04)}
.lang button{border:0;background:transparent;color:var(--muted);font-size:12px;font-weight:800;min-width:36px;min-height:34px;padding:7px 10px;border-radius:999px;cursor:pointer;transition:transform .12s ease,background .24s ease,color .24s ease,box-shadow .24s ease;-webkit-tap-highlight-color:transparent}
.lang button:active{transform:scale(.94)}
.lang button.active{background:var(--blue-600);color:#fff;box-shadow:inset 0 1px 0 rgba(255,255,255,.26),0 4px 12px rgba(27,116,228,.22)}
main{padding:66px 0 96px}
.page-head{max-width:760px;margin-bottom:42px}
.page-head h1{font-size:clamp(34px,6vw,52px);line-height:1.08;letter-spacing:-.04em}
.page-head .lead{font-size:17px;color:var(--ink-2);margin-top:18px;max-width:65ch}
.page-head .updated{font-size:13px;color:var(--muted);margin-top:12px}
.doc-list{display:grid;gap:16px}
.doc-section{padding:26px 28px;border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:0 6px 24px rgba(24,86,180,.06)}
.doc-section h2{font-size:20px;line-height:1.3;letter-spacing:-.02em;margin-bottom:10px}
.doc-body{color:var(--ink-2);overflow-wrap:anywhere}
.doc-body p+p{margin-top:10px}
.doc-body ul,.doc-body ol{padding-left:22px;margin-top:10px}
.doc-body li+li{margin-top:6px}
.doc-body a{color:var(--blue-700);font-weight:600;text-decoration:underline;text-underline-offset:3px}
.doc-body table{width:100%;border-collapse:collapse}
.doc-body pre{max-width:100%;overflow:auto;padding:14px;border-radius:12px;background:var(--bg-soft)}
.callout{margin-top:22px;padding:18px 20px;border:1px solid var(--blue-100);background:var(--blue-50);border-radius:14px;color:var(--blue-700)}
.faq-list{display:grid;gap:12px}
.faq-item{border:1px solid var(--line);border-radius:16px;background:#fff;overflow:hidden}
.faq-item summary{list-style:none;cursor:pointer;padding:19px 22px;font-weight:750;display:flex;align-items:center;justify-content:space-between;gap:18px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';color:var(--blue-600);font-size:22px;line-height:1}
.faq-item[open] summary::after{content:'-'}
.faq-answer{padding:0 22px 20px;color:var(--ink-2)}
.state{padding:34px;border:1px dashed var(--line);border-radius:18px;background:var(--bg-soft);color:var(--muted);text-align:center}
.skeleton{height:112px;border-radius:18px;background:linear-gradient(90deg,#f3f6fa 25%,#e9eef5 37%,#f3f6fa 63%);background-size:400% 100%;animation:load 1.4s ease infinite}
@keyframes load{0%{background-position:100% 0}100%{background-position:0 0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.skeleton{animation:none}}
@media(prefers-reduced-transparency:reduce){.site-header{background:#f8fbff;-webkit-backdrop-filter:none;backdrop-filter:none;border-color:var(--line)}}
@media(prefers-contrast:more){.site-header,.back,.lang{border-color:#52657e}}
@media(max-width:620px){
  .wrap{width:min(100% - 32px,920px)}
  .site-header{top:6px;width:calc(100% - 12px);margin-top:6px;border-radius:15px}
  .site-nav{height:58px;gap:10px;padding:0 10px}
  .brand>span:last-child{display:none}
  .nav-actions{gap:6px;min-width:0}
  .back{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:8px 11px;font-size:12px;white-space:nowrap}
  .lang{flex:none;padding:2px}
  .lang button{min-width:36px;min-height:36px;padding:6px 8px}
  main{padding:36px 0 68px}
  .page-head{margin-bottom:26px}
  .page-head h1{font-size:clamp(30px,9.6vw,38px);line-height:1.1;letter-spacing:-.035em;overflow-wrap:anywhere}
  .page-head .lead{font-size:15px;line-height:1.65;margin-top:14px}
  .page-head .updated{margin-top:10px}
  .doc-list{gap:12px}
  .doc-section{padding:20px 16px;border-radius:16px}
  .doc-section h2{font-size:18px;line-height:1.35;margin-bottom:9px}
  .doc-body{font-size:14.5px;line-height:1.68}
  .doc-body ul,.doc-body ol{padding-left:20px}
  .doc-body table{display:block;max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .callout{padding:16px;margin-top:18px;font-size:14.5px}
  .faq-list{gap:10px}
  .faq-item{border-radius:14px}
  .faq-item summary{min-height:56px;padding:16px;font-size:14.5px;line-height:1.45}
  .faq-answer{padding:0 16px 17px;font-size:14.5px;line-height:1.68;overflow-wrap:anywhere}
  .state{padding:26px 18px;border-radius:16px}
  .skeleton{height:104px;border-radius:16px}
}