.header {
  background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);

  padding: 2rem 3rem;

  position: fixed;
  z-index: 100;
  right: 0;
  left: 0;
  top: 0;
}

.header-content {
  max-width: 120rem;
  margin: 0 auto;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2.4rem;
}

.header-logo {
  font-size: 3rem;

  background: linear-gradient(45deg, #f39c12, #e74c3c);
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-nav-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2.8rem;
  font-size: 1.6rem;
  font-weight: 600;
}

.header-nav-list a:link,
.header-nav-list a:visited {
  color: #fff;
  text-decoration: none;

  /* underline effect */
  display: block;
  position: relative;
  padding: 0.2rem 0;
  overflow: hidden;
}

.header-nav-list a:hover,
.header-nav-list a:active {
  color: #fff;
}

/* underline effect */
.header-nav-list a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 0.1rem;
  background-color: #f39c12;
  transition: transform 0.3s;
  transform: translate3d(-100%, 0, 0);
}

.header-nav-list a:hover::after,
.header-nav-list a:active::after {
  transform: translate3d(0, 0, 0);
}