* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #e5e7eb;
  background:
    radial-gradient(circle at top left, rgba(59, 130, 246, 0.25), transparent 32rem),
    linear-gradient(135deg, #020617 0%, #0f172a 45%, #111827 100%);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

.nav {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 800;
  font-size: 22px;
  letter-spacing: 0.04em;
}

nav {
  display: flex;
  gap: 18px;
  color: #cbd5e1;
  font-size: 14px;
}

nav a:hover {
  color: white;
}

.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 90px 24px 70px;
}

.hero h1 {
  font-size: clamp(38px, 7vw, 74px);
  line-height: 1.02;
  margin: 12px 0 24px;
  max-width: 900px;
}

.tag {
  display: inline-block;
  color: #93c5fd;
  background: rgba(37, 99, 235, 0.16);
  border: 1px solid rgba(147, 197, 253, 0.25);
  border-radius: 999px;
  padding: 8px 14px;
}

.desc {
  max-width: 760px;
  color: #cbd5e1;
  font-size: 18px;
  line-height: 1.8;
}

.actions {
  margin-top: 32px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 13px 20px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  color: #e5e7eb;
  background: rgba(15, 23, 42, 0.6);
}

.btn.primary {
  background: #2563eb;
  border-color: #2563eb;
  color: white;
  font-weight: 700;
}

.cards {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.card, .flow, .page, .download-box {
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 18px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.2);
}

.card {
  padding: 24px;
}

.card p, .flow li, .page p, .page li {
  color: #cbd5e1;
  line-height: 1.8;
}

.flow {
  max-width: 1120px;
  margin: 24px auto 80px;
  padding: 30px;
}

.page {
  max-width: 900px;
  margin: 48px auto 80px;
  padding: 32px;
}

.download-box {
  padding: 22px;
  margin: 24px 0;
}

.small {
  color: #94a3b8;
  font-size: 14px;
}

footer {
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 24px;
  color: #94a3b8;
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 16px;
  }

  nav {
    flex-wrap: wrap;
  }

  .cards {
    grid-template-columns: 1fr;
  }
}