* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: #111;
  background: #ffffff;
  line-height: 1.7;
}

a {
  text-decoration: none;
  color: #111;
}

.nav {
  position: sticky;
  top: 0;
  background: #ffffff;
  border-bottom: 1px solid #e5e7eb;
  z-index: 10;
}

.nav-inner {
  max-width: 1100px;
  margin: auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 600;
}

.nav a {
  margin-left: 24px;
  font-size: 14px;
  color: #374151;
}

.nav-cta {
  padding: 8px 14px;
  background: #111827;
  color: #ffffff;
  border-radius: 6px;
}

.hero {
  padding: 120px 24px;
}

.container {
  max-width: 1100px;
  margin: auto;
}

.narrow {
  max-width: 680px;
}

.center {
  text-align: center;
}

h1 {
  font-size: 64px;
  line-height: 1.15;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 20px;
  color: #374151;
  margin-bottom: 32px;
}

.btn-primary {
  display: inline-block;
  padding: 14px 24px;
  background: #111827;
  color: #ffffff;
  border-radius: 6px;
  font-weight: 500;
}

.section {
  padding: 96px 24px;
}

.alt {
  background: #fafafa;
}

.authority {
  padding: 48px 24px;
  border-top: 1px solid #e5e7eb;
  border-bottom: 1px solid #e5e7eb;
}

h2 {
  font-size: 36px;
  margin-bottom: 32px;
}

h3 {
  font-size: 20px;
  margin-bottom: 8px;
}

p {
  margin-bottom: 24px;
  color: #374151;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}

.card {
  border: 1px solid #e5e7eb;
  padding: 32px;
  border-radius: 8px;
}

.card a {
  font-size: 14px;
  color: #111827;
}

.product {
  border: 1px solid #e5e7eb;
  padding: 32px;
  border-radius: 8px;
  margin-bottom: 32px;
}

.footer {
  padding: 48px 24px;
  text-align: center;
  font-size: 14px;
  color: #6b7280;
  border-top: 1px solid #e5e7eb;
}

@media (max-width: 768px) {
  h1 {
    font-size: 42px;
  }

  h2 {
    font-size: 28px;
  }
}