* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #020617;
  color: #e5e7eb;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 8%;
  background: rgba(2, 6, 23, 0.9);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}

.logo {
  font-weight: 700;
  font-size: 20px;
  color: #38bdf8;
}

.nav-btn {
  color: #e5e7eb;
  text-decoration: none;
  border: 1px solid #334155;
  padding: 10px 16px;
  border-radius: 999px;
}

.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 8%;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.25), transparent 35%),
    radial-gradient(circle at bottom right, rgba(59, 130, 246, 0.2), transparent 35%);
}

.hero-content {
  max-width: 900px;
  text-align: center;
}

.tag {
  color: #38bdf8;
  font-weight: 600;
  letter-spacing: 1px;
}

h1 {
  font-size: clamp(44px, 8vw, 92px);
  margin: 20px 0;
  line-height: 1;
}

.subtitle {
  font-size: 20px;
  color: #cbd5e1;
  max-width: 720px;
  margin: 0 auto 32px;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  padding: 14px 24px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
}

.primary {
  background: #38bdf8;
  color: #020617;
}

.secondary {
  border: 1px solid #475569;
  color: #e5e7eb;
}

.section {
  padding: 80px 8%;
  max-width: 1200px;
  margin: auto;
}

.section h2 {
  font-size: 36px;
  margin-bottom: 20px;
}

.section p {
  color: #cbd5e1;
  font-size: 18px;
  line-height: 1.7;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.card {
  background: #0f172a;
  border: 1px solid #1e293b;
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.25);
}

.card h3 {
  color: #38bdf8;
}

.diagram pre {
  background: #0f172a;
  border: 1px solid #1e293b;
  border-radius: 20px;
  padding: 30px;
  overflow-x: auto;
  color: #93c5fd;
  font-size: 18px;
  line-height: 1.8;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.badges span {
  padding: 12px 18px;
  border-radius: 999px;
  background: #0f172a;
  border: 1px solid #334155;
  color: #cbd5e1;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stats div {
  background: #0f172a;
  padding: 30px;
  border-radius: 20px;
  border: 1px solid #1e293b;
}

.stats h3 {
  font-size: 42px;
  color: #38bdf8;
  margin: 0;
}

.roadmap ul {
  list-style: none;
  padding: 0;
}

.roadmap li {
  background: #0f172a;
  margin: 12px 0;
  padding: 18px;
  border-radius: 14px;
  border: 1px solid #1e293b;
}

footer {
  text-align: center;
  padding: 40px 8%;
  background: #020617;
  border-top: 1px solid #1e293b;
  color: #94a3b8;
}

@media (max-width: 900px) {
  .cards,
  .stats {
    grid-template-columns: 1fr;
  }

  .navbar {
    flex-direction: column;
    gap: 12px;
  }
}