#navigation{
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(255,255,255,.10);
  background: rgba(11,15,20,.65);
  backdrop-filter: blur(10px);
}

.mobile-nav-header{
  display:none;
  align-items:center;
  justify-content:space-between;
  padding: 14px 18px;
}

.logo-nav img{
  height: 54px;
  width: auto;
  display:block;
}

.hamburger{
  width: 46px;
  height: 46px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.06);
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
  gap: 6px;
  flex-direction: column;
}
.hamburger span{
  width: 18px;
  height: 2px;
  background: rgba(255,255,255,.85);
  display:block;
}

.navigation-ul{
  margin:0;
  padding: 14px 18px;
  list-style:none;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap: 18px;
}

.main-nav{
  display:flex;
  align-items:center;
  gap: 18px;
}

.desktop-logo{ margin-right: 8px; }

.navigation-ul a{
  opacity:.85;
  font-size: 13px;
  letter-spacing: .8px;
  position:relative;
}
.navigation-ul a:hover{ opacity:1; }
.navigation-ul a::after{
  content:"";
  position:absolute;
  left:0; bottom:-8px;
  width:0%;
  height:2px;
  background: #1a7cff;
  transition: width .18s ease;
  border-radius:999px;
}
.navigation-ul a:hover::after{ width:100%; }

@media (max-width: 820px){
  .mobile-nav-header{ display:flex; }
  .navigation-ul{
    display:none;
    flex-direction: column;
    align-items:flex-start;
    padding: 10px 18px 18px;
  }
  .navigation-ul.open-menu{ display:flex; }
  .desktop-logo{ display:none; }
}