/* ScaleTensor Docs — same palette as the main site; reading layout: sticky sidebar + 72ch column. */
:root{
  --bg:#f5f7f9; --surface:#ffffff; --surface-2:#eef1f5;
  --fg:#131822; --muted:#596273; --line:#e0e5ec;
  --accent:#0c7b84; --accent-ink:#ffffff; --signal:#b5602a; --warn:#9a5b00;
  --code-bg:#0f141e; --code-fg:#dfe6ef; --code-muted:#7f8ba0;
  --display:"Sora",-apple-system,"Segoe UI",sans-serif;
  --body:"Hanken Grotesk",-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",monospace;
  --cjk:"Noto Sans SC",-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0a0d12; --surface:#121824; --surface-2:#0f141e;
  --fg:#e9edf3; --muted:#8894a6; --line:#222c3b;
  --accent:#34d3c2; --accent-ink:#06211f; --signal:#e39254; --warn:#f0b35a;
  --code-bg:#070a0f; --code-fg:#dfe6ef; --code-muted:#7f8ba0;
  color-scheme:dark;
}}
:root[data-theme="dark"]{
  --bg:#0a0d12; --surface:#121824; --surface-2:#0f141e;
  --fg:#e9edf3; --muted:#8894a6; --line:#222c3b;
  --accent:#34d3c2; --accent-ink:#06211f; --signal:#e39254; --warn:#f0b35a;
  --code-bg:#070a0f; --code-fg:#dfe6ef; --code-muted:#7f8ba0;
  color-scheme:dark;
}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--fg);font:16px/1.65 var(--body);-webkit-font-smoothing:antialiased}
:root[data-lang="zh"] body{font-family:var(--cjk)}
[data-l]{display:none}
:root[data-lang="en"] [data-l="en"],:root[data-lang="zh"] [data-l="zh"]{display:revert}
a{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:21;background:var(--bg)}
.top-in{max-width:1240px;margin-inline:auto;display:flex;align-items:center;gap:1rem;padding-block:.8rem;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.brand{display:flex;align-items:center;gap:.5rem;font:700 1.05rem var(--display);letter-spacing:-.02em;color:var(--fg);text-decoration:none}
.brand small{font:500 .72rem var(--mono);color:var(--accent);letter-spacing:.12em;text-transform:uppercase;border:1px solid var(--line);border-radius:6px;padding:.15em .45em}
.brand svg{width:22px;height:22px}
.top .sp{flex:1}
.top a.home{font-size:.88rem;color:var(--muted);text-decoration:none}
.top a.home:hover{color:var(--fg)}
.lang{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;font:.76rem var(--mono)}
.lang button{appearance:none;background:transparent;border:0;color:var(--muted);padding:.42em .66em;cursor:pointer;font:inherit;line-height:1}
.lang button[aria-pressed="true"]{background:var(--accent);color:var(--accent-ink)}
.menu-btn{display:none;appearance:none;background:transparent;border:1px solid var(--line);border-radius:8px;color:var(--fg);padding:.4em .7em;font:.82rem var(--mono);cursor:pointer}

.shell-body{max-width:1240px;margin-inline:auto;display:grid;grid-template-columns:250px minmax(0,1fr);gap:3rem;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.side{position:sticky;top:calc(env(safe-area-inset-top,0px) + 62px);align-self:start;max-height:calc(100vh - 80px);overflow-y:auto;padding-block:2rem}
.side h4{font:600 .7rem var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:1.4rem 0 .5rem}
.side h4:first-child{margin-top:0}
.side ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.side a{display:block;padding:.38rem .7rem;border-radius:7px;color:var(--fg);text-decoration:none;font-size:.92rem;border-left:2px solid transparent}
.side a:hover{background:var(--surface-2)}
.side a[aria-current="page"]{background:color-mix(in srgb,var(--accent) 12%,transparent);border-left-color:var(--accent);color:var(--fg);font-weight:600}
@media(max-width:900px){
  .shell-body{grid-template-columns:1fr;gap:0}
  .menu-btn{display:inline-block}
  .side{position:static;max-height:none;padding-block:1rem;border-bottom:1px solid var(--line)}
  .side:not(.open){display:none}
  .top a.home{display:none}
}

.doc{padding-block:2.4rem 5rem;min-width:0;max-width:76ch}
.doc .eyebrow{font:500 .74rem var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
:root[data-lang="zh"] .doc .eyebrow{font-family:var(--cjk);letter-spacing:.06em;text-transform:none}
.doc h1,.doc h2,.doc h3{font-family:var(--display);letter-spacing:-.01em;line-height:1.2;text-wrap:balance}
:root[data-lang="zh"] .doc h1,:root[data-lang="zh"] .doc h2,:root[data-lang="zh"] .doc h3{font-family:var(--cjk);letter-spacing:0}
.doc h1{font-size:clamp(1.8rem,4vw,2.5rem);margin:.4rem 0 .8rem}
.doc h2{font-size:1.4rem;margin:2.6rem 0 .7rem;padding-top:.4rem}
.doc h3{font-size:1.08rem;margin:1.8rem 0 .5rem}
.doc p,.doc li{color:color-mix(in srgb,var(--fg) 86%,var(--muted))}
.doc p{margin:.7rem 0}
.doc .lead{font-size:1.12rem;color:var(--muted)}
.doc ul,.doc ol{padding-left:1.3rem;margin:.6rem 0}
.doc li{margin:.3rem 0}
.doc code{font:.86em var(--mono);background:var(--surface-2);border:1px solid var(--line);border-radius:5px;padding:.08em .35em;overflow-wrap:anywhere}
.codebox{position:relative;margin:1rem 0}
.codebox pre{margin:0;background:var(--code-bg);color:var(--code-fg);border-radius:10px;padding:1rem 1.1rem;overflow-x:auto;font:.82rem/1.7 var(--mono)}
.codebox pre .c{color:var(--code-muted)}
.codebox .cp{position:absolute;top:.5rem;right:.5rem;appearance:none;border:1px solid #2a3446;background:#151c28;color:#b8c3d3;border-radius:6px;font:.72rem var(--mono);padding:.3em .6em;cursor:pointer}
.codebox .cp:hover{color:#fff}
.codebox .lbl{position:absolute;top:.55rem;left:1.1rem;font:.66rem var(--mono);color:var(--code-muted);letter-spacing:.1em;text-transform:uppercase}
.codebox.has-lbl pre{padding-top:2rem}
.note{border:1px solid var(--line);border-left:3px solid var(--accent);background:var(--surface);border-radius:10px;padding:.85rem 1rem;margin:1.2rem 0;font-size:.94rem}
.note.warn{border-left-color:var(--warn)}
.note b{color:var(--fg)}
.tbl{overflow-x:auto;margin:1rem 0;border:1px solid var(--line);border-radius:10px}
.tbl table{border-collapse:collapse;width:100%;font-size:.9rem;min-width:520px}
.tbl th,.tbl td{text-align:left;padding:.6rem .8rem;border-top:1px solid var(--line);vertical-align:top}
.tbl thead th{border-top:0;background:var(--surface-2);font-weight:600;font-size:.82rem}
.tbl td code{white-space:nowrap}
.steps{list-style:none;padding:0;counter-reset:s;display:flex;flex-direction:column;gap:.2rem}
.steps li{counter-increment:s;position:relative;padding:.55rem 0 .55rem 2.6rem;border-left:1px solid var(--line);margin-left:.8rem}
.steps li::before{content:counter(s);position:absolute;left:-.85rem;top:.5rem;width:1.7rem;height:1.7rem;border-radius:50%;background:var(--surface);border:1px solid var(--accent);color:var(--accent);font:600 .78rem var(--mono);display:grid;place-items:center}
.steps li b{color:var(--fg)}
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.9rem;margin:1.4rem 0}
@media(max-width:620px){.cards{grid-template-columns:1fr}}
.cards a{display:block;text-decoration:none;color:var(--fg);background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:1.05rem 1.1rem;transition:border-color .15s ease,transform .15s ease}
.cards a:hover{border-color:var(--accent);transform:translateY(-1px)}
.cards a span{display:block;font:500 .7rem var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
.cards a b{display:block;font:600 1.02rem var(--display);margin-top:.3rem}
:root[data-lang="zh"] .cards a b{font-family:var(--cjk)}
.cards a p{margin:.35rem 0 0;font-size:.88rem;color:var(--muted)}
.pager{display:flex;justify-content:space-between;gap:1rem;margin-top:3rem;padding-top:1.4rem;border-top:1px solid var(--line);flex-wrap:wrap}
.pager a{text-decoration:none;font-size:.92rem}
.foot{color:var(--muted);font:.76rem var(--mono);margin-top:2.4rem}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}