:root {
  --bg: #0F172A;
  --bg-2: #0B1120;
  --surface: #1E293B;
  --surface-2: #334155;
  --text: #F8FAFC;
  --muted: #94A3B8;
  --faint: rgba(255,255,255,0.5);
  --blue: #3B82F6;
  --violet: #8B5CF6;
  --radius: 16px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 920px; margin: 0 auto; padding: 0 20px; }

/* Nav */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(15,23,42,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 21px; text-decoration: none; }
.brand-mark { width: 32px; height: 32px; border-radius: 8px; display: block; }
.wordmark {
  background: linear-gradient(90deg, #2B6BFF, #7A3CFF);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.nav-links { display: flex; gap: 22px; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 14px; transition: color .15s; }
.nav-links a:hover { color: var(--text); }

/* Hero */
.hero { padding: 52px 0 56px; text-align: center; }
.hero-logo { width: 120px; height: 120px; border-radius: 28px; margin-bottom: 18px; }
.hero h1 { font-size: clamp(40px, 6vw, 60px); font-weight: 800; letter-spacing: -1px; line-height: 1.05; }
.tagline { max-width: 520px; margin: 12px auto 30px; color: var(--muted); font-size: 17px; }

.cta-row { display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  background: linear-gradient(90deg, #2B6BFF, #7A3CFF);
  color: #fff; border: none; padding: 15px 34px; border-radius: 999px;
  font-size: 16px; font-weight: 600; cursor: pointer; text-decoration: none;
  display: inline-flex; align-items: center; gap: 10px;
  transition: filter .15s;
}
.btn-primary:hover { filter: brightness(1.08); }
.plat-sub { color: var(--faint); font-size: 13px; }

/* Downloads */
.dl-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 30px; }
.dl-card {
  background: var(--surface); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius); padding: 18px 12px; cursor: pointer; color: var(--text);
  text-decoration: none; display: flex; flex-direction: column; align-items: center; gap: 8px;
  transition: border-color .15s, transform .15s, background .15s;
}
.dl-card:hover { border-color: var(--blue); transform: translateY(-2px); background: var(--surface-2); }
.dl-card .ic { font-size: 26px; }
.dl-card b { font-size: 15px; font-weight: 600; }
.dl-card em { font-style: normal; color: var(--muted); font-size: 12px; }

/* Features */
.features-section { background: var(--bg-2); border-top: 1px solid rgba(255,255,255,0.06); padding: 48px 0; }
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.feature { background: var(--surface); border: 1px solid rgba(255,255,255,0.06); border-radius: var(--radius); padding: 20px; }
.feature .ic { font-size: 22px; }
.feature h3 { font-size: 16px; margin: 8px 0 4px; }
.feature p { color: var(--muted); font-size: 13px; }

footer { padding: 30px 0; text-align: center; color: var(--faint); font-size: 13px; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--text); }

/* CTA note when a platform is detected / downloading */
.dl-card.downloading { border-color: var(--violet); }
.dl-card.downloading em { color: var(--violet); }

@media (max-width: 720px) {
  .dl-grid { grid-template-columns: repeat(2, 1fr); }
  .features { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
}