header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(6px);
  padding: 2rem 9%;
  box-shadow: 0 0.4rem 1.4rem rgba(0, 0, 0, 0.08);
  transition: box-shadow 0.2s ease, background-color 0.2s ease;
}

header.scrolled {
  background-color: rgba(255, 255, 255, 0.92);
  box-shadow: 0 0.8rem 2rem rgba(0, 0, 0, 0.12);
}

header .logo {
  font-size: 2.5rem;
  font-weight: bolder;
  color: #666;
}

.logo i {
  padding-right: 0.5rem;
  color: var(--red);
}

header .navbar a {
  font-size: 1.8rem;
  margin-left: 2rem;
  color: #666;
  font-weight: 600;
}

.navbar a:hover {
  color: var(--red);
}

#menu-bar {
  font-size: 3rem;
  cursor: pointer;
  color: #666;
  border: 0.1rem solid #666;
  border-radius: 0.3rem;
  padding: 0.5rem 1.5rem;
  display: none;
}