:root{
  --bg:#0f1216; --panel:#161b22; --ink:#e6edf3; --muted:#9aa7b4;
  --line:#232b34; --accent:#3b82f6; --accent2:#22d3ee;
  --radius:14px; --wrap:1060px;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.6;font-size:16px}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 22px}
code{background:#0b0e12;border:1px solid var(--line);border-radius:6px;padding:1px 6px;font-size:.9em}

/* header / footer */
header.site{border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(15,18,22,.82);backdrop-filter:blur(8px);z-index:10}
.nav{display:flex;align-items:center;justify-content:space-between;height:62px}
.brand{font-weight:700;font-size:1.15rem;letter-spacing:-.2px;display:flex;align-items:center;gap:9px}
.brand .thin{color:var(--muted);font-weight:500}
.dot{width:11px;height:11px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));box-shadow:0 0 12px var(--accent)}
nav a{color:var(--muted);margin-left:20px;font-size:.95rem}
nav a:hover{color:var(--ink)}
footer.site{border-top:1px solid var(--line);margin-top:60px}
.foot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;padding:26px 22px;color:var(--muted);font-size:.9rem}
.muted{color:var(--muted)}

/* buttons */
.btn{display:inline-block;background:linear-gradient(135deg,var(--accent),#2563eb);color:#fff;padding:11px 20px;border-radius:10px;font-weight:600;font-size:.95rem;border:1px solid transparent;transition:transform .12s ease,opacity .12s}
.btn:hover{transform:translateY(-1px);opacity:.95}
.btn.ghost{background:transparent;border-color:var(--line);color:var(--ink)}

/* hero */
.eyebrow{color:var(--accent2);font-weight:600;letter-spacing:.14em;text-transform:uppercase;font-size:.75rem;margin:0 0 14px}
.hero{padding:86px 0 64px;background:radial-gradient(900px 380px at 70% -10%,rgba(59,130,246,.16),transparent)}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);line-height:1.08;letter-spacing:-1px;margin:.1em 0 .35em;max-width:16ch}
.lead{font-size:1.13rem;color:var(--muted);max-width:60ch;margin:0 0 26px}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.pop{margin-top:26px;color:var(--muted);font-size:.9rem}
.pop #rtt{color:#34d399}

/* band + grid */
.band{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--panel);padding:40px 0;margin-top:64px}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.grid article h3{margin:0 0 4px;font-size:1.5rem;letter-spacing:-.5px}
.grid article p{margin:0;color:var(--muted);font-size:.92rem}

/* features */
.features{padding:64px 0}
.features h2{font-size:1.7rem;letter-spacing:-.5px;margin:0 0 28px}
.cols{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.cols h4{margin:0 0 8px;font-size:1.08rem}
.cols p{margin:0;color:var(--muted);font-size:.95rem}
.contact{margin-top:0}
.contact h2{margin:0 0 8px}
.contact p{color:var(--muted);margin:0}
.contact a{color:var(--accent2)}

/* doc / about */
.doc{padding:56px 0 20px;max-width:760px}
.doc h1{font-size:clamp(1.8rem,4vw,2.6rem);letter-spacing:-.7px;margin:.1em 0 .4em}
.doc h2{margin:2em 0 .5em;font-size:1.3rem}
.doc ol,.doc ul{color:var(--muted);padding-left:1.2em}
.doc li{margin:.35em 0}
.doc table{width:100%;border-collapse:collapse;margin:.6em 0;font-size:.94rem}
.doc th,.doc td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line)}
.doc th{color:var(--muted);font-weight:600}
.back{margin-top:2.4em}
.back a{color:var(--accent2)}

@media(max-width:820px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .cols{grid-template-columns:1fr}
  nav a:not(.btn){display:none}
}