body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, sans-serif;
  background: #f0f4f8;
  color: #1a202c;
}
nav {
  display: flex;
  justify-content: center;
  background: #ffffff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
nav a {
  padding: 15px 20px;
  text-decoration: none;
  color: #0d47a1;
  font-weight: 500;
}
nav a.active {
  border-bottom: 2px solid #0d47a1;
}
section.hero {
  text-align: center;
  padding: 100px 20px;
  background: #0d47a1;
  color: #fff;
}
section.hero .logo {
  max-width: 100px;
  margin-bottom: 20px;
}
section.hero h1 {
  font-size: 48px;
  margin: 10px 0;
}
section.hero .slogan {
  font-size: 20px;
  margin: 10px 0;
}
section.hero .services {
  margin: 20px 0;
  font-size: 16px;
}
section.hero .btn {
  display: inline-block;
  padding: 10px 30px;
  background: #fff;
  color: #0d47a1;
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
}
section.content {
  max-width: 800px;
  margin: 60px auto;
  padding: 0 20px;
}
section.content h2 {
  color: #0d47a1;
  margin-bottom: 20px;
}
.case {
  background: #fff;
  padding: 20px;
  border-radius: 4px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.case h3 {
  margin-top: 0;
}