:root{
  --bg: #0b1220;
  --bg-soft: #111a2e;
  --text: #e9eef7;
  --muted: #b6c2d9;
  --accent: #42b0ff;
  --card: #121b31;
  --border: #1f2a48;
}
:root.light{
  --bg:#f7f9fc; --bg-soft:#fff; --text:#0c1220; --muted:#4a5876; --accent:#007bff; --card:#ffffff; --border:#dfe6f6;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a{color:var(--accent); text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding: 32px 20px}
.site-header{
  position: sticky; top:0; z-index:10;
  display:flex; align-items:center; gap:16px;
  padding:14px 20px; border-bottom:1px solid var(--border);
  background: rgba(11,18,32,.85); backdrop-filter:saturate(180%) blur(14px);
}
:root.light .site-header{ background: rgba(255,255,255,.8) }
.brand{display:flex; align-items:center; gap:10px; font-weight:700; color:var(--text)}
.site-nav{margin-left:auto}
.site-nav ul{display:flex; gap:14px; list-style:none; margin:0; padding:0}
.nav-link{padding:8px 10px; border-radius:8px}
.nav-link.active, .nav-link:hover{background:var(--bg-soft); color:var(--text)}
.nav-toggle{display:none; width:40px; height:40px; border-radius:8px; border:1px solid var(--border); background:transparent}
.mode-toggle{margin-left:6px; border:1px solid var(--border); background:transparent; border-radius:8px; padding:8px 10px; cursor:pointer}
.hero{
  display:grid; place-items:center; padding:80px 20px; background:
    radial-gradient(1200px 600px at 10% -10%, rgba(66,176,255,.15), transparent),
    radial-gradient(800px 400px at 90% 10%, rgba(66,176,255,.12), transparent);
  border-bottom:1px solid var(--border);
}
.hero-inner{max-width:900px; text-align:center}
.hero h1{font-size: clamp(28px, 5vw, 44px); margin: 0 0 10px}
.hero p{color:var(--muted); margin:0 auto 20px; max-width:720px}
.hero-cta{display:flex; gap:12px; justify-content:center; margin: 18px 0 26px}
.btn{display:inline-block; padding:10px 16px; border-radius:10px; border:1px solid var(--border)}
.btn.primary{background:var(--accent); color:white; border:none}
.btn.ghost{background:transparent}
.hero-stats{display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin-top:16px}
.hero-stats>div{background:var(--card); border:1px solid var(--border); padding:12px 14px; border-radius:12px}
.features .grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
.card{background:var(--card); border:1px solid var(--border); padding:18px; border-radius:14px}
.cta{text-align:center}
.note{margin-top:16px; padding:12px 14px; border:1px dashed var(--border); background:var(--bg-soft); border-radius:12px}
.check{line-height:1.9}
.site-footer{border-top:1px solid var(--border); padding:20px; display:flex; justify-content:space-between; gap:12px; flex-wrap:wrap}
.footer-links a{opacity:.9}
.faq details{background:var(--card); border:1px solid var(--border); border-radius:12px; padding:12px 16px; margin:10px 0}
.faq summary{cursor:pointer; font-weight:600}
.grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}

@media (max-width: 880px){
  .site-nav{display:none}
  .nav-toggle{display:block; margin-left:auto}
  .hero-stats{grid-template-columns:1fr}
  .features .grid-3, .grid-3{grid-template-columns:1fr}
}
.open .site-nav{display:block; position:absolute; top:64px; left:0; right:0; background:var(--bg-soft); padding:10px 20px; border-bottom:1px solid var(--border)}
.open .site-nav ul{flex-direction:column; gap:8px}