* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: #04060c;
  color: #dff7ff;
  overflow-x: hidden;
}

/* Ambient grid */
.ambient-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.15;
  animation: gridDrift 120s linear infinite;
  z-index: -3;
}

/* Ambient glow */
.ambient-glow {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(0,255,255,0.18), transparent 45%),
    radial-gradient(circle at 80% 60%, rgba(255,0,255,0.18), transparent 50%);
  animation: glowPulse 18s ease-in-out infinite;
  z-index: -2;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}

@keyframes gridDrift {
  from { transform: translateY(0); }
  to { transform: translateY(120px); }
}

/* Layout */
.container {
  min-height: 100vh;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Hero — SEALED FIRST SCREEN */
.hero {
  height: 100vh;               /* ⬅️ LOCK to viewport */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

/* Prevent next content from bleeding into hero */
.hero + .panel {
  margin-top: 0;
}

.logo {
  font-size: 96px;
  letter-spacing: 4px;
  background: linear-gradient(90deg, #00f6ff, #ff4fd8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 40px rgba(0,255,255,0.4);
  animation: logoBreathe 6s ease-in-out infinite;
}

@keyframes logoBreathe {
  0%,100% { text-shadow: 0 0 35px rgba(0,255,255,0.35); }
  50% { text-shadow: 0 0 60px rgba(255,0,255,0.45); }
}

.subtitle {
  letter-spacing: 2px;
  margin-top: 6px;
  color: #7eeaff;
}

.tagline {
  margin-top: 32px;
  font-size: 20px;
  line-height: 1.6;
}

/* Panels */
.panel {
  width: 100%;
  max-width: 640px;
  margin-bottom: 80px;
  text-align: center;
  scroll-margin-top: 40px;
}

.panel h2 {
  color: #8cf5ff;
  margin-bottom: 24px;
  font-size: 28px;
}

.features {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  max-width: 520px;
}

.features li {
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

/* Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  justify-items: center;
}

.grid div {
  padding: 16px;
  width: 100%;
  max-width: 260px;
  border-radius: 8px;
  background: rgba(0,0,0,0.35);
  border: 1px solid rgba(0,255,255,0.15);
}

/* Contact */
.contact {
  opacity: 0.85;
}