:root {
  color-scheme: dark;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #1e293b 0%, #0b1020 45%, #020617 100%);
  color: #e2e8f0;
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.7s ease;
}

body.is-visible {
  opacity: 1;
}

.landing-stage {
  position: fixed;
  inset: 0;
  z-index: 0;
  isolation: isolate;
}

#networkCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
}

.noise {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(148, 163, 184, 0.14) 1px, transparent 1px);
  background-size: 3px 3px;
  opacity: 0.05;
  z-index: 1;
}

.vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, transparent 28%, rgba(2, 6, 23, 0.74) 95%);
  z-index: 3;
  pointer-events: none;
}

.topbar {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 5;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
}

.topbar nav {
  display: flex;
  gap: 1rem;
}

.topbar a {
  color: #93c5fd;
  text-decoration: none;
}

.hero-wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
  display: grid;
  gap: 1.25rem;
  position: relative;
  z-index: 5;
}

.hero {
  border: 1px solid #334155;
  border-radius: 16px;
  background: rgba(15, 23, 42, 0.8);
  padding: 2rem;
}

.eyebrow {
  margin: 0;
  color: #60a5fa;
  font-weight: 600;
}

h1 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.15;
}

.sub {
  margin-top: 1rem;
  color: #cbd5e1;
  max-width: 680px;
}

.cta-row {
  margin-top: 1.35rem;
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  border: 1px solid #334155;
  border-radius: 10px;
  padding: 0.7rem 1rem;
  text-decoration: none;
  color: #e2e8f0;
  background: #1f2937;
}

.btn.primary {
  background: #1d4ed8;
  border-color: #1d4ed8;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  border: 1px solid #334155;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.8);
  padding: 1rem;
}

.card h2 {
  margin: 0;
  font-size: 1.05rem;
}

.card p {
  margin: 0.55rem 0 0;
  color: #cbd5e1;
}