:root{
  --paper:#E9ECF1;
  --card:#FFFFFF;
  --ink:#121A2B;
  --ink2:#3B475F;
  --muted:#6C7891;
  --line:#D6DBE4;
  --accent:#2C39D8;
  --accent-soft:#E7E9FD;
  --good:#0E8A5F;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none;border-bottom:1px solid rgba(44,57,216,.28)}
a:hover{border-bottom-color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}

/* ---------- shell ---------- */
.shell{display:grid;grid-template-columns:236px minmax(0,1fr);gap:56px;
  max-width:1160px;margin:0 auto;padding:0 28px}
.side{position:sticky;top:0;align-self:start;height:100vh;overflow-y:auto;
  padding:36px 0 40px;border-right:1px solid var(--line)}
.side .brand{display:block;font-weight:700;font-size:17px;letter-spacing:-.02em;
  color:var(--ink);border-bottom:0;margin-bottom:4px}
.side .brand span{display:block;font-weight:400;font-size:12.5px;color:var(--muted);letter-spacing:0}
.side nav{margin-top:26px;padding-right:24px}
.side nav p{margin:0 0 8px;font-size:12px;color:var(--muted)}
.side ol{list-style:none;margin:0 0 22px;padding:0;counter-reset:n}
.side ol li{counter-increment:n}
.side ol a{
  display:flex;gap:10px;padding:6px 10px 6px 8px;border-radius:7px;border-bottom:0;
  font-size:14.5px;color:var(--ink2);line-height:1.5;
}
.side ol a::before{content:counter(n);font-family:var(--mono);font-size:12px;color:var(--muted);
  flex:none;padding-top:2px}
.side ol a:hover{background:#fff;color:var(--ink)}
.side ol a[aria-current="page"]{background:var(--accent-soft);color:var(--accent);font-weight:600}
.side ol a[aria-current="page"]::before{color:var(--accent)}

main{padding:44px 0 0;min-width:0;max-width:760px}

/* ---------- type ---------- */
.eyebrow{font-size:13px;color:var(--muted);letter-spacing:.04em;margin:0 0 14px}
h1{font-size:clamp(32px,5vw,46px);line-height:1.1;font-weight:700;letter-spacing:-.03em;margin:0 0 16px}
.lede{font-size:17.5px;line-height:1.7;color:var(--ink2);max-width:54ch;margin:0 0 8px}
h2{font-size:clamp(23px,3.4vw,29px);line-height:1.25;font-weight:700;letter-spacing:-.02em;
  margin:56px 0 8px;scroll-margin-top:20px}
h3{font-size:17px;font-weight:650;margin:0 0 6px;letter-spacing:-.01em}
.sec-note{color:var(--muted);font-size:15px;margin:0 0 26px;max-width:60ch}
p{margin:0 0 16px}

/* ---------- bits ---------- */
.k{display:inline-flex;align-items:center;justify-content:center;
  min-width:1.7em;padding:.1em .45em;margin:0 .08em;
  font-family:var(--mono);font-size:.82em;line-height:1.5;
  background:#fff;color:var(--ink);
  border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;white-space:nowrap}
.path{font-family:var(--mono);font-size:.86em;background:#fff;
  border:1px solid var(--line);border-radius:5px;padding:.1em .4em}
.tip{font-size:14px;color:var(--muted)}

/* ---------- outline ---------- */
.outline{margin:30px 0 0;padding:16px 20px;background:var(--card);
  border:1px solid var(--line);border-radius:12px}
.outline p{margin:0 0 6px;font-size:12.5px;color:var(--muted)}
.outline ul{list-style:none;margin:0;padding:0;columns:2;column-gap:28px}
.outline li{margin:2px 0;break-inside:avoid}
.outline a{border-bottom:0;color:var(--ink);font-size:14.5px}
.outline a:hover{color:var(--accent)}
.outline a.on{color:var(--accent);font-weight:600}

/* ---------- launcher mock ---------- */
.launcher{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;
  box-shadow:0 18px 40px -24px rgba(18,26,43,.45);margin:28px 0}
.launcher-bar{display:flex;align-items:center;gap:12px;padding:14px 18px;border-bottom:1px solid var(--line)}
.launcher-bar .dot{width:9px;height:9px;border-radius:50%;background:var(--accent);flex:none}
#q{flex:1;border:0;outline:0;background:transparent;font-family:var(--sans);font-size:19px;color:var(--ink)}
#q::placeholder{color:#A7AFC0}
.caret{width:2px;height:20px;background:var(--accent);animation:blink 1.15s steps(1) infinite}
@keyframes blink{0%,50%{opacity:1}50.01%,100%{opacity:0}}
@media (prefers-reduced-motion:reduce){.caret{animation:none}}
.rows{list-style:none;margin:0;padding:6px;max-height:250px;overflow:auto}
.rows li{border-radius:8px}
.rows button{display:flex;width:100%;align-items:baseline;gap:12px;padding:9px 12px;border:0;
  background:transparent;border-radius:8px;font-family:var(--sans);font-size:15px;color:var(--ink);
  text-align:left;cursor:pointer}
.rows li[aria-selected="true"] button{background:var(--accent-soft)}
.rows .name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rows .kind{font-size:13px;color:var(--muted);flex:none}
.launcher-foot{display:flex;justify-content:space-between;gap:12px;padding:10px 16px;
  border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.empty{padding:20px 14px;color:var(--muted);font-size:15px}

/* ---------- facts ---------- */
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:0 0 8px}
.facts div{background:var(--paper);padding:15px 18px}
.facts dt{font-size:13px;color:var(--muted);margin:0 0 2px}
.facts dd{margin:0;font-size:15px;line-height:1.5}

/* ---------- steps ---------- */
ol.steps{list-style:none;counter-reset:s;margin:0;padding:0}
ol.steps > li{counter-increment:s;position:relative;padding:20px 0 20px 54px;border-top:1px solid var(--line)}
ol.steps > li:last-child{border-bottom:1px solid var(--line)}
ol.steps > li::before{content:counter(s);position:absolute;left:0;top:20px;width:30px;height:30px;
  border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:13px;background:var(--ink);color:#fff}
ol.steps p{margin:0 0 6px;color:var(--ink2);font-size:15px}
ol.steps p:last-child{margin-bottom:0}

/* ---------- cards ---------- */
.cards{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.cards article{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px 22px}
.cards p{margin:0;font-size:15px;color:var(--ink2)}
.cards ul{margin:10px 0 0;padding-left:18px;font-size:14.5px;color:var(--ink2)}
.cards li{margin-bottom:4px}

/* ---------- feature list ---------- */
dl.feat{margin:0;border-top:1px solid var(--line)}
dl.feat > div{display:grid;grid-template-columns:180px 1fr;gap:24px;padding:18px 0;
  border-bottom:1px solid var(--line)}
dl.feat dt{font-weight:650;font-size:15.5px;line-height:1.5}
dl.feat dt small{display:block;font-weight:400;font-size:13px;color:var(--muted)}
dl.feat dd{margin:0;font-size:15px;color:var(--ink2)}
dl.feat dd p{margin:0 0 8px}
dl.feat dd p:last-child{margin-bottom:0}

/* ---------- callout ---------- */
.callout{margin:26px 0;background:var(--card);border:1px solid var(--line);
  border-left:3px solid var(--good);border-radius:12px;padding:20px 22px}
.callout h3{margin-bottom:8px}
.callout p{margin:0 0 10px;font-size:15px;color:var(--ink2)}
.callout p:last-child{margin-bottom:0}

/* ---------- cheatsheet ---------- */
.sheet table{width:100%;border-collapse:collapse;margin-bottom:8px}
.sheet td{padding:8px 0;vertical-align:top;font-size:15px;border-bottom:1px solid rgba(214,219,228,.7)}
.sheet tr:last-child td{border-bottom:0}
.sheet td:first-child{width:215px;padding-right:20px;white-space:nowrap}
.sheet td:last-child{color:var(--ink2)}

/* ---------- checklist ---------- */
.check{list-style:none;margin:0;padding:0}
.check li{border-bottom:1px solid var(--line)}
.check label{display:flex;gap:12px;align-items:flex-start;padding:13px 2px;cursor:pointer;font-size:15px}
.check input{margin:5px 0 0;width:16px;height:16px;accent-color:var(--accent);flex:none}
.check input:checked + span{color:var(--muted);text-decoration:line-through}
.check span{color:var(--ink2)}

/* ---------- link cards ---------- */
.links{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.links a{display:block;background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:14px 18px;color:var(--ink)}
.links a:hover{border-color:var(--accent)}
.links strong{display:block;font-weight:650;font-size:15px}
.links em{font-style:normal;font-size:13px;color:var(--muted)}

/* ---------- pager ---------- */
.pager{display:flex;justify-content:space-between;gap:16px;margin-top:64px;
  padding-top:22px;border-top:1px solid var(--line)}
.pager a{border-bottom:0;font-size:15px;color:var(--ink2)}
.pager a:hover{color:var(--accent)}
.pager span{display:block;font-size:12px;color:var(--muted)}
.pager .next{text-align:right;margin-left:auto}

footer.foot{margin-top:40px;padding:20px 0 56px;font-size:13.5px;color:var(--muted)}

@media (max-width:900px){
  .shell{grid-template-columns:1fr;gap:0;padding:0 22px}
  .side{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line);
    padding:26px 0 18px}
  .side nav{padding-right:0}
  .side ol{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:0}
  .side ol a{background:#fff;border:1px solid var(--line)}
  main{padding-top:32px}
  .facts,.cards,.links{grid-template-columns:1fr}
  .outline ul{columns:1}
  dl.feat > div{grid-template-columns:1fr;gap:4px}
  .sheet td:first-child{width:auto;white-space:normal}
  .sheet td{display:block;border:0;padding:2px 0}
  .sheet tr{display:block;padding:10px 0;border-bottom:1px solid rgba(214,219,228,.7)}
}