body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background-color: #ffffff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: #333333;
  letter-spacing: -0.02em;
}

.nav-bar ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-bar li {
  margin-left: 2rem;
}

.nav-bar a {
  text-decoration: none;
  color: #333333;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: background-color 0.3s ease;
}

.nav-bar a:hover {
  background-color: #f5f5f5;
}