* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: #18202a;
  background: #f7f4ee;
  line-height: 1.6;
}

a {
  color: inherit;
}

.hero {
  min-height: 82vh;
  padding: 28px;
  background: linear-gradient(135deg, #111827, #324156);
  color: white;
}

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

.logo {
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-button,
.primary,
.secondary {
  display: inline-block;
  text-decoration: none;
  border-radius: 999px;
  padding: 12px 20px;
  font-weight: 700;
}

.nav-button,
.secondary {
  border: 1px solid rgba(255,255,255,0.55);
}

.primary {
  background: #f5b942;
  color: #172033;
}

.hero-content {
  max-width: 920px;
  margin: 120px auto 0;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.85rem;
  color: #f5b942;
  font-weight: 800;
}

h1 {
  font-size: clamp(2.6rem, 7vw, 5.7rem);
  line-height: 0.95;
  margin: 16px 0;
}

.subhead {
  max-width: 700px;
  font-size: 1.2rem;
  color: #e5e7eb;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 30px;
}

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 56px 24px;
}

.problem,
.features,
.safety,
.signup {
  background: white;
  border-radius: 24px;
  padding: 34px;
  margin-bottom: 24px;
  box-shadow: 0 12px 30px rgba(17, 24, 39, 0.08);
}

h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.05;
  margin-top: 0;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 24px;
}

.cards article {
  background: #ffffff;
  padding: 28px;
  border-radius: 22px;
  box-shadow: 0 12px 30px rgba(17, 24, 39, 0.08);
}

.features ul {
  columns: 2;
  padding-left: 20px;
}

.signup {
  text-align: center;
}

footer {
  text-align: center;
  padding: 30px;
  color: #4b5563;
}

@media (max-width: 800px) {
  .cards {
    grid-template-columns: 1fr;
  }

  .features ul {
    columns: 1;
  }

  .hero-content {
    margin-top: 80px;
  }
}