@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600&display=swap');

:root{
  --bg:#0a1215; --surface:#101c21; --surface2:#16262c; --border:#1e3138;
  --green:#3ddc84; --blue:#57c3f2; --deep:#0572b3;
  --text:#e8f0f3; --muted:#7796a2; --danger:#ff6b6b; --r:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--text);
  font-family:'IBM Plex Sans',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  font-size:16px; line-height:1.6; -webkit-text-size-adjust:100%;
}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(900px 420px at 50% -8%,rgba(61,220,132,.08),transparent 60%),
             radial-gradient(700px 380px at 110% 6%,rgba(87,195,242,.06),transparent 55%)}
.mono{font-family:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,monospace}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}

.wrap{max-width:820px;margin:0 auto;padding:0 20px 80px}

/* header */
header{position:sticky;top:0;z-index:40;background:rgba(10,18,21,.9);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border)}
.head-in{max-width:820px;margin:0 auto;display:flex;align-items:center;gap:14px;padding:14px 20px}
.logo{width:40px;height:40px;flex:0 0 40px;border-radius:50%;
  background:radial-gradient(circle at 32% 26%,#12343f,#081318);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center}
.logo svg{width:24px;height:24px;display:block}
.brand{flex:1;min-width:0}
.brand .name{font-family:'IBM Plex Mono',monospace;font-weight:700;font-size:16px;letter-spacing:.4px}
.brand .sub{color:var(--muted);font-size:12px}
.nav{display:flex;gap:8px}
.nav a{font-family:'IBM Plex Mono',monospace;font-size:13px;color:var(--muted);
  padding:7px 12px;border-radius:10px;border:1px solid transparent;transition:.2s}
.nav a:hover{color:var(--text);border-color:var(--border);text-decoration:none}
.nav a.active{color:var(--green);border-color:var(--border);background:var(--surface)}

/* doc */
.doc-head{padding:40px 0 8px}
.doc-head h1{font-family:'IBM Plex Mono',monospace;font-weight:700;font-size:30px;margin:0 0 10px;
  line-height:1.2;background:linear-gradient(90deg,var(--text),var(--blue));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.doc-head .meta{color:var(--muted);font-size:13px;font-family:'IBM Plex Mono',monospace}
.doc-head .lead{margin-top:18px;color:#c3d4da;font-size:16px}

.toc{background:linear-gradient(180deg,var(--surface),#0d181c);border:1px solid var(--border);
  border-radius:var(--r);padding:18px 22px;margin:28px 0}
.toc b{font-family:'IBM Plex Mono',monospace;font-size:12px;text-transform:uppercase;
  letter-spacing:1.2px;color:var(--muted);display:block;margin-bottom:10px}
.toc ol{margin:0;padding-left:20px;columns:2;column-gap:28px}
.toc li{margin:4px 0;break-inside:avoid}
.toc a{color:#c3d4da;font-size:14px}

h2{font-family:'IBM Plex Mono',monospace;font-weight:600;font-size:20px;margin:38px 0 12px;
  scroll-margin-top:80px;display:flex;gap:10px;align-items:baseline}
h2 .n{color:var(--green);font-size:15px;flex:0 0 auto}
h3{font-family:'IBM Plex Mono',monospace;font-weight:600;font-size:16px;color:var(--blue);margin:22px 0 8px}
p{margin:10px 0}
ul,ol.body{margin:10px 0;padding-left:22px}
li{margin:6px 0}
strong{color:#fff}

.note{border-left:3px solid var(--green);background:rgba(61,220,132,.06);
  padding:12px 16px;border-radius:0 12px 12px 0;margin:16px 0;font-size:15px}
.warn{border-left:3px solid var(--danger);background:rgba(255,107,107,.07);
  padding:12px 16px;border-radius:0 12px 12px 0;margin:16px 0;font-size:15px}
.tbd{color:var(--danger);font-family:'IBM Plex Mono',monospace;font-size:13px}

table{width:100%;border-collapse:collapse;margin:16px 0;font-size:15px}
th,td{border:1px solid var(--border);padding:10px 12px;text-align:left}
th{background:var(--surface);font-family:'IBM Plex Mono',monospace;font-weight:600;color:var(--blue)}

footer{border-top:1px solid var(--border);margin-top:50px;padding:26px 0;color:var(--muted);font-size:13px}
footer a{color:var(--muted)}
footer .row{display:flex;gap:18px;flex-wrap:wrap;margin-top:8px}

@media(max-width:620px){
  .toc ol{columns:1}
  .doc-head h1{font-size:24px}
  .nav a{padding:7px 9px;font-size:12px}
}