:root{
  --bg:#0b1020; --fg:#e8f0ff; --muted:#b7c1d9;
  --accent:#6ee7ff; --accent2:#8fffbd;
  --glass:rgba(14,20,40,.45); --glass-border:rgba(255,255,255,.08);
}
*{box-sizing:border-box}
html,body{height:100%}
body.theme-dark{margin:0;background:var(--bg);color:var(--fg);
  font:16px/1.5 ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial}

.bg{position:fixed;inset:0;z-index:-2;overflow:hidden}
.bg__video{width:100%;height:100%;object-fit:cover;filter:saturate(110%) contrast(104%) brightness(80%)}
.bg__overlay{position:absolute;inset:0;background:
  radial-gradient(60% 80% at 50% 20%, rgba(8,12,24,.35) 0, rgba(8,12,24,.7) 50%, rgba(8,12,24,.9) 100%)}

.nav{position:fixed;inset:0 0 auto 0;height:64px;display:flex;align-items:center;
  justify-content:space-between;padding:0 22px;backdrop-filter:blur(8px);
  background:linear-gradient(to bottom, rgba(0,0,0,.32), rgba(0,0,0,0)); z-index:10}
.nav__brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--fg);font-weight:800}
.brand__dot{width:10px;height:10px;border-radius:999px;background:linear-gradient(135deg,var(--accent),var(--accent2));
  box-shadow:0 0 12px var(--accent)}
.brand__text{font-size:20px}
.nav__links{display:flex;gap:16px}
.nav__link{color:var(--fg);text-decoration:none;font-weight:600;opacity:.9;padding:8px 12px;border-radius:10px;
  transition:all .18s ease;border:1px solid transparent}
.nav__link:hover{opacity:1;border-color:var(--glass-border);background:rgba(255,255,255,.06)}

.hero{min-height:100svh;display:grid;place-items:center;padding:80px 16px 32px}
.hero__card{display:grid;justify-items:center;gap:16px;text-align:center;padding:36px 28px;width:min(680px,92dvw);
  background:var(--glass);border:1px solid var(--glass-border);border-radius:24px;
  box-shadow:0 12px 40px rgba(0,0,0,.35);backdrop-filter:blur(10px)}
.logo{background:linear-gradient(135deg,var(--accent),#c3f4ff 35%,var(--accent2));
  -webkit-background-clip:text;background-clip:text;color:transparent;font-size:56px;letter-spacing:.6px;
  text-shadow:0 0 22px rgba(110,231,255,.25)}
.hero__title{margin:0}
.hero__tagline{margin:0;color:var(--muted);font-size:18px}
.hero__cta{margin-top:8px;display:inline-block;padding:14px 20px;border-radius:14px;text-decoration:none;color:#061019;font-weight:800;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  box-shadow:0 10px 24px rgba(110,231,255,.2), 0 2px 0 rgba(255,255,255,.25) inset;
  transition:transform .12s ease, box-shadow .12s ease}
.hero__cta:hover{transform:translateY(-1px);box-shadow:0 14px 28px rgba(110,231,255,.28), 0 2px 0 rgba(255,255,255,.25) inset}
.hero__subnote{font-size:12.5px;color:var(--muted);margin-top:2px}

.footer{position:fixed;bottom:10px;left:0;right:0;text-align:center;color:var(--muted);font-size:12px;pointer-events:none}

@media (max-width:520px){
  .logo{font-size:42px}
  .hero__card{padding:26px 20px}
  .nav{height:56px;padding:0 14px}
  .nav__links{gap:12px}
}