:root{
  --bg:#ffffff; --panel:#f7f8fa; --ink:#1b1f24; --ink-soft:#5a626c; --ink-faint:#8a929c;
  --line:#e7eaee; --teal:#0e9488; --teal-deep:#0b7a70; --teal-soft:#e3f4f2; --code-bg:#f4f6f8;
  --sidebar:268px; --toc:200px; --maxw:1320px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:'IBM Plex Sans',system-ui,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
::selection{background:var(--teal-soft)}
code,pre,.mono{font-family:'IBM Plex Mono',monospace}
h1,h2,h3{line-height:1.2;letter-spacing:-.01em}

/* topbar */
.topbar{position:sticky;top:0;z-index:40;height:60px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.85);backdrop-filter:blur(10px);display:flex;align-items:center}
.topbar .in{max-width:var(--maxw);margin:0 auto;width:100%;padding:0 22px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.tb-left{display:flex;align-items:center;gap:14px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:17px}
.brand .mark{width:28px;height:28px;border-radius:8px;background:var(--teal);color:#fff;display:grid;place-items:center;font-family:'IBM Plex Mono';font-weight:600;font-size:15px}
.ver{font-family:'IBM Plex Mono';font-size:12px;color:var(--teal-deep);background:var(--teal-soft);padding:3px 9px;border-radius:6px;font-weight:500}
.search{flex:1;max-width:380px}
.search input{width:100%;border:1px solid var(--line);background:var(--panel);border-radius:9px;padding:9px 14px;font-family:'IBM Plex Sans';font-size:14px;color:var(--ink);outline:none}
.search input:focus{border-color:var(--teal)}
.tb-right{display:flex;align-items:center;gap:18px}
.tb-right a{font-size:14px;font-weight:500;color:var(--ink-soft)}.tb-right a:hover{color:var(--ink)}
.tb-cta{background:var(--teal);color:#fff!important;padding:8px 16px;border-radius:8px;font-weight:600!important}
#menuBtn{display:none;border:1px solid var(--line);background:#fff;border-radius:8px;width:38px;height:38px;font-size:17px;cursor:pointer}

/* layout */
.layout{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr) var(--toc);gap:0;padding:0 22px}

/* sidebar */
.sidebar{border-right:1px solid var(--line);padding:30px 26px 60px;position:sticky;top:60px;height:calc(100vh - 60px);overflow-y:auto}
.nav-group{margin-bottom:26px}
.nav-group h5{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-faint);font-weight:600;margin-bottom:10px}
.nav-group a{display:block;font-size:14px;color:var(--ink-soft);padding:6px 10px;border-radius:7px;margin-bottom:2px;transition:background .15s,color .15s}
.nav-group a:hover{background:var(--panel);color:var(--ink)}
.nav-group a.active{background:var(--teal-soft);color:var(--teal-deep);font-weight:600}

/* content */
.content{padding:42px 48px 90px;min-width:0}
.crumbs{font-family:'IBM Plex Mono';font-size:12.5px;color:var(--ink-faint);margin-bottom:18px}
.crumbs span{color:var(--teal-deep)}
.content h1{font-size:36px;margin-bottom:14px}
.lead{font-size:18px;color:var(--ink-soft);margin-bottom:30px;padding-bottom:24px;border-bottom:1px solid var(--line)}
.content h2{font-size:24px;margin:40px 0 14px;scroll-margin-top:78px}
.content h3{font-size:18px;margin:26px 0 10px}
.content p{margin-bottom:16px;color:#33383f}
.content ul,.content ol{margin:0 0 18px 22px}.content li{margin-bottom:7px}
.content a.link{color:var(--teal-deep);font-weight:500;border-bottom:1px solid var(--teal-soft)}
.content a.link:hover{border-color:var(--teal)}
code:not(pre code){background:var(--code-bg);border:1px solid var(--line);padding:1.5px 6px;border-radius:5px;font-size:13.5px;color:var(--teal-deep)}
pre{background:#0f1720;border-radius:12px;padding:18px 20px;overflow-x:auto;margin:6px 0 22px;border:1px solid #1c2630}
pre code{font-size:13.5px;line-height:1.75;color:#cdd9e5}
pre .c{color:#6b7785}pre .k{color:#7cc7ff}pre .s{color:#9be7a6}pre .f{color:#ffd479}
.callout{display:flex;gap:13px;padding:16px 18px;border-radius:11px;margin:6px 0 22px;font-size:14.5px;border:1px solid}
.callout.tip{background:var(--teal-soft);border-color:#bfe6e1;color:var(--teal-deep)}
.callout.warn{background:#fff5e6;border-color:#ffe1ad;color:#946200}
.callout .i{font-weight:700}
table.doc{width:100%;border-collapse:collapse;margin:6px 0 24px;font-size:14px}
table.doc th,table.doc td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line)}
table.doc th{font-family:'IBM Plex Mono';font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--ink-faint)}
table.doc td code{font-size:12.5px}
.pager{display:flex;justify-content:space-between;gap:14px;margin-top:46px;padding-top:26px;border-top:1px solid var(--line)}
.pager a{flex:1;border:1px solid var(--line);border-radius:11px;padding:16px 18px;transition:border-color .2s}
.pager a:hover{border-color:var(--teal)}
.pager .dir{font-family:'IBM Plex Mono';font-size:12px;color:var(--ink-faint)}
.pager .ttl{font-weight:600;color:var(--ink);margin-top:3px}
.pager .next{text-align:right}

/* toc */
.toc{padding:42px 0 60px 22px;position:sticky;top:60px;height:calc(100vh - 60px);overflow-y:auto}
.toc h6{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-faint);font-weight:600;margin-bottom:12px}
.toc a{display:block;font-size:13.5px;color:var(--ink-soft);padding:5px 0 5px 12px;border-left:2px solid var(--line);transition:color .15s,border-color .15s}
.toc a:hover,.toc a.active{color:var(--teal-deep);border-color:var(--teal)}

#mobileNav{display:none}
@media(max-width:1080px){
  .layout{grid-template-columns:var(--sidebar) minmax(0,1fr)}
  .toc{display:none}
}
@media(max-width:820px){
  .layout{grid-template-columns:1fr}
  .sidebar{display:none;position:fixed;top:60px;left:0;width:280px;max-width:84vw;background:#fff;z-index:39;box-shadow:0 20px 50px rgba(0,0,0,.12)}
  .sidebar.open{display:block}
  #menuBtn{display:block}
  .search{display:none}
  .content{padding:32px 20px 70px}
}
@media(max-width:560px){
  .topbar .in{padding:0 16px}
  .tb-right a:not(.tb-cta){display:none}
  .content{padding:26px 16px 60px}
  .content h1{font-size:28px}
  .content h2{font-size:21px}
  .lead{font-size:16.5px}
  .pager{flex-direction:column}
  /* let wide tables scroll instead of stretching the page */
  table.doc{display:block;overflow-x:auto;white-space:nowrap}
  .ver{display:none}
}