:root {
  --bg: #0f1424;
  --bg2: #161d33;
  --card: #1b2440;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #3b82f6;
  --accent2: #22c55e;
  --border: #2a3553;
  --maxw: 880px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #1e2748 0%, var(--bg) 60%);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 20px; max-width: var(--maxw); margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; font-size: 18px; }
.brand .logo {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), #6366f1);
  display: grid; place-items: center; font-size: 18px;
}
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 14px; font-weight: 600; }
nav a:hover { color: var(--text); }

.hero { text-align: center; padding: 56px 20px 40px; }
.hero h1 { font-size: 42px; font-weight: 850; letter-spacing: -0.5px; }
.hero .tag { color: var(--muted); font-size: 18px; margin-top: 14px; }
.hero .sub { color: var(--accent2); font-weight: 700; margin-top: 10px; }
.cta { display: inline-block; margin-top: 26px; padding: 14px 26px; border-radius: 14px;
  background: var(--accent); color: #fff; font-weight: 700; text-decoration: none; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 30px 0 10px; }
.feature { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 20px; }
.feature .ic { font-size: 24px; }
.feature h3 { font-size: 17px; margin: 10px 0 6px; }
.feature p { color: var(--muted); font-size: 14px; }

.doc { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 28px; margin: 30px 0; }
.doc h1 { font-size: 28px; margin-bottom: 6px; }
.doc .updated { color: var(--muted); font-size: 13px; margin-bottom: 18px; }
.doc h2 { font-size: 18px; margin: 22px 0 8px; }
.doc p { color: #d4dcec; margin-bottom: 12px; }
.doc a { color: var(--accent); }

footer { border-top: 1px solid var(--border); margin-top: 48px; padding: 28px 20px; }
footer .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px; }
footer a { color: var(--muted); text-decoration: none; font-size: 14px; margin-right: 18px; }
footer a:hover { color: var(--text); }
footer .copy { color: var(--muted); font-size: 13px; }
.back { display: inline-block; color: var(--muted); text-decoration: none; font-size: 14px; margin-bottom: 18px; }
@media (max-width: 600px) { .hero h1 { font-size: 32px; } }