body {
  margin: 0;
  font-family: Arial, sans-serif;
  color: #1f2933;
  background: #f6f8fb;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 60px;
  background: white;
  border-bottom: 1px solid #e5e7eb;
}

.logo strong {
  display: block;
  font-size: 28px;
  color: #0b3a53;
  letter-spacing: 2px;
}

.logo span {
  font-size: 13px;
  color: #667085;
}

nav a {
  margin-left: 24px;
  text-decoration: none;
  color: #0b3a53;
  font-weight: 600;
  font-size: 14px;
}

.hero {
  min-height: 520px;
  display: flex;
  align-items: center;
  background: linear-gradient(120deg, #0b3a53, #126782);
  color: white;
}

.hero-content {
  max-width: 820px;
  padding: 80px 60px;
}

.hero h1 {
  font-size: 48px;
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero p {
  font-size: 20px;
  line-height: 1.6;
  max-width: 700px;
}

.btn {
  display: inline-block;
  margin-top: 25px;
  padding: 14px 26px;
  background: #ffffff;
  color: #0b3a53;
  text-decoration: none;
  border-radius: 999px;
  font-weight: bold;
}

main {
  max-width: 1200px;
  margin: auto;
  padding: 70px 30px;
}

.intro {
  text-align: center;
  max-width: 850px;
  margin: 0 auto 60px;
}

.intro h2,
.specialites h2,
.cta h2 {
  font-size: 34px;
  color: #0b3a53;
}

.intro p,
.cta p {
  font-size: 18px;
  line-height: 1.7;
  color: #4b5563;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.cards article {
  background: white;
  padding: 30px;
  border-radius: 18px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.06);
}

.cards h3 {
  color: #0b3a53;
  font-size: 21px;
}

.cards p {
  color: #4b5563;
  line-height: 1.6;
}

.specialites {
  margin-top: 80px;
  text-align: center;
}

.specialites-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  margin-top: 30px;
}

.specialites-grid span {
  background: white;
  padding: 18px;
  border-radius: 14px;
  font-weight: bold;
  color: #126782;
}

.cta {
  margin-top: 80px;
  padding: 60px;
  text-align: center;
  background: #0b3a53;
  color: white;
  border-radius: 24px;
}

.cta h2,
.cta p {
  color: white;
}

footer {
  text-align: center;
  padding: 30px;
  background: white;
  color: #667085;
}

@media (max-width: 900px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
  }

  nav {
    margin-top: 20px;
  }

  nav a {
    display: block;
    margin: 10px 0;
  }

  .hero h1 {
    font-size: 34px;
  }

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