:root{
  --paper:#FCFCFD;--ink:#14161B;--muted:#616774;--faint:#8A909C;
  --line:#E6E8EC;--panel:#FAFBFC;--signal:#1E48D4;--signal-soft:#ECEFFF;
  --display:"Space Grotesk",system-ui,sans-serif;
  --body:"Inter",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
  --sb-w:300px;--max:760px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--body);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--signal);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}

/* top bar */
.topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:20px;
  height:60px;padding:0 20px;background:rgba(252,252,253,.9);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--display);
  font-weight:700;letter-spacing:-.01em;color:var(--ink);font-size:17px;white-space:nowrap}
.brand:hover{text-decoration:none}
.brand img{height:26px;width:auto}
.brand .sub{font-family:var(--mono);font-size:11px;font-weight:400;color:var(--faint)}
.manuals{display:flex;gap:4px;margin-left:6px}
.manuals a{font-family:var(--mono);font-size:12px;padding:5px 10px;border-radius:6px;
  color:var(--muted);border:1px solid transparent;white-space:nowrap}
.manuals a.on{background:var(--ink);color:#fff}
.manuals a:hover{text-decoration:none;background:var(--signal-soft);color:var(--signal)}
.manuals a.on:hover{background:var(--ink);color:#fff}
.search{display:flex;align-items:center;gap:8px;height:36px;padding:0 12px;
  border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--faint);
  font-size:13px;min-width:180px}
.search:focus-within{border-color:var(--signal)}
.search input{border:0;outline:0;font-family:var(--body);font-size:13px;
  background:transparent;width:100%;color:var(--ink)}
.menu-btn{display:none;align-items:center;justify-content:center;width:38px;height:38px;
  border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer;color:var(--ink)}

/* layout */
.layout{display:flex;flex-direction:row-reverse;align-items:flex-start;max-width:1260px;margin:0 auto}

/* sidebar */
.sidebar{width:var(--sb-w);flex:0 0 var(--sb-w);position:sticky;top:60px;align-self:flex-start;
  height:calc(100vh - 60px);overflow-y:auto;padding:24px 18px 60px 12px;
  border-left:1px solid var(--line);background:var(--panel)}
.sb-search{width:100%;min-width:0;margin:0 0 18px}
.sb-title{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--faint);margin:0 0 12px 8px}
.tree details{margin:0}
.tree summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:6px;
  padding:6px 8px;border-radius:7px;color:var(--ink)}
.tree summary::-webkit-details-marker{display:none}
.tree summary:hover{background:#fff}
.tree summary .chev{width:13px;height:13px;flex:0 0 13px;color:var(--faint);transition:transform .18s ease}
.tree details[open]>summary .chev{transform:rotate(90deg)}
.tree summary a{font-size:13.5px;font-weight:600;color:var(--ink);line-height:1.35}
.tree summary a:hover{color:var(--signal);text-decoration:none}
.tree summary a.grp{font-family:var(--display)}
.tree ul{list-style:none;margin:1px 0 4px 13px;padding:0 0 0 14px;border-left:1px solid var(--line)}
.tree li a{display:block;padding:5px 8px;border-radius:6px;font-size:13px;color:var(--muted);line-height:1.4}
.tree li a:hover{background:#fff;color:var(--ink);text-decoration:none}
.tree a.active{background:var(--signal-soft);color:var(--signal)!important;font-weight:600;
  box-shadow:inset 2px 0 0 var(--signal)}

/* content */
.content{flex:1 1 auto;min-width:0;padding:34px 40px 80px}
.wrap{max-width:var(--max);margin:0 auto}
.crumbs{font-family:var(--mono);font-size:12px;color:var(--faint);margin-bottom:18px;line-height:1.7}
.crumbs a{color:var(--muted)}
.crumbs .sep{padding:0 6px;color:var(--line)}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;
  color:var(--signal);margin:0 0 10px}
h1{font-family:var(--display);font-weight:700;letter-spacing:-.02em;font-size:32px;line-height:1.16;margin:.1em 0 0}

/* SEO lead */
.lead{margin:22px 0 30px;padding:16px 20px;
  background:linear-gradient(90deg,var(--signal-soft),transparent 90%);
  border-left:3px solid var(--signal);border-radius:0 8px 8px 0;font-size:15.5px;color:#2b2f39}
.lead b{color:var(--ink);font-weight:600}

/* preserved original body */
.article{font-size:16px}
.article p{margin:.7em 0}
.article b,.article strong{font-weight:600}
.article img{vertical-align:middle}
.article ol{margin:1em 0;padding-left:1.5em}
.article ol>li{margin:.55em 0;padding-left:.2em}
.article ol ul,.article ul{list-style:none;margin:.4em 0;padding-left:1.1em}
.article ol ul li,.article ul li{position:relative;padding-left:14px;margin:.35em 0;color:var(--muted)}
.article ol ul li::before,.article ul li::before{content:"";position:absolute;left:2px;top:.6em;
  width:5px;height:5px;border-radius:50%;background:var(--line)}
.article h5{font-family:var(--display);font-size:15px;font-weight:600;margin:1.2em 0 .2em}
/* prev / next blocks that come from the original markup */
.article > div[style*="calc(50% - 4px)"]{border:1px solid var(--line);border-radius:10px;
  background:#fff;padding:12px 14px!important;margin:6px 0!important;box-sizing:border-box}
.article > div[style*="calc(50% - 4px)"] h5{margin:0 0 4px!important;font-size:14px}
.article > div[style*="calc(50% - 4px)"] img{display:none}

/* FAQ */
.faq{margin:44px 0 10px}
.faq h2{font-family:var(--display);font-weight:700;font-size:22px;letter-spacing:-.01em;margin:0 0 6px}
.faq .tag{font-family:var(--mono);font-size:12px;color:var(--faint);margin-bottom:16px}
.faq details{border:1px solid var(--line);border-radius:10px;background:#fff;margin-bottom:10px;overflow:hidden}
.faq summary{list-style:none;cursor:pointer;padding:15px 46px 15px 18px;
  font-family:var(--display);font-weight:600;font-size:16px;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:18px;top:13px;font-size:20px;
  color:var(--signal);font-weight:400;transition:transform .18s ease}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq .a{padding:0 18px 16px;color:var(--muted);font-size:15px}

footer{max-width:1260px;margin:0 auto;padding:26px 40px;border-top:1px solid var(--line);
  color:var(--faint);font-family:var(--mono);font-size:12px}

.scrim{display:none}
@media(max-width:900px){
  :root{--sb-w:290px}
  .menu-btn{display:flex}
  .sidebar{position:fixed;top:60px;right:0;z-index:35;transform:translateX(100%);
    transition:transform .22s ease;box-shadow:0 20px 60px rgba(0,0,0,.12);border-left:1px solid var(--line)}
  body.nav-open .sidebar{transform:translateX(0)}
  body.nav-open .scrim{display:block;position:fixed;inset:60px 0 0;background:rgba(0,0,0,.28);z-index:30}
  .content{padding:26px 20px 70px}h1{font-size:26px}
}