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

body {
  font-family: Arial, Helvetica, sans-serif;
  color: #172033;
  background: #ffffff;
  line-height: 1.6;
}

.nav {
  width: 100%;
  padding: 22px 8%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #ffffff;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}

.logo {
  font-weight: 700;
  font-size: 20px;
}

.nav a {
  margin-left: 24px;
  text-decoration: none;
  color: #172033;
  font-weight: 500;
}

.hero {
  min-height: 620px;
  display: flex;
  align-items: center;
  padding: 80px 8%;
  background: linear-gradient(rgba(8, 21, 48, 0.78), rgba(8, 21, 48, 0.78)),
              url('https://images.unsplash.com/photo-1586528116311-ad8dd3c8310d?auto=format&fit=crop&w=1600&q=80');
  background-size: cover;
  background-position: center;
  color: white;
}

.hero-content {
  max-width: 760px;
}

.tagline {
  font-size: 15px;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 18px;
  color: #d9e8ff;
}

h1 {
  font-size: 56px;
  line-height: 1.1;
  margin-bottom: 24px;
}

.subtitle {
  font-size: 20px;
  margin-bottom: 34px;
  color: #edf4ff;
}

.button {
  display: inline-block;
  background: #1d5cff;
  color: white;
  padding: 14px 28px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
}

.section {
  padding: 80px 8%;
}

.section h2 {
  font-size: 36px;
  text-align: center;
  margin-bottom: 38px;
}

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

.card {
  padding: 30px;
  border-radius: 14px;
  background: #f7f9fc;
  border: 1px solid #e5eaf2;
}

.card h3 {
  font-size: 22px;
  margin-bottom: 14px;
}

.light {
  background: #f5f8fc;
}

.center {
  max-width: 760px;
  margin: 0 auto 30px auto;
  text-align: center;
  font-size: 18px;
}

.coverage {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

.coverage span {
  background: white;
  padding: 14px 24px;
  border-radius: 999px;
  border: 1px solid #dce5f2;
  font-weight: 700;
}

.about-text {
  max-width: 850px;
  margin: 0 auto;
  font-size: 18px;
  text-align: center;
}

.contact {
  background: #0d1b33;
  color: white;
  text-align: center;
}

.contact p {
  font-size: 18px;
}

.contact-box {
  margin: 30px auto 0 auto;
  max-width: 520px;
  padding: 28px;
  background: rgba(255,255,255,0.08);
  border-radius: 14px;
}

footer {
  padding: 24px 8%;
  text-align: center;
  background: #071224;
  color: #cbd5e1;
}

@media (max-width: 900px) {
  .nav {
    flex-direction: column;
    gap: 14px;
  }

  .nav a {
    margin: 0 8px;
  }

  h1 {
    font-size: 40px;
  }

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

  .hero {
    min-height: 560px;
  }
}