.header {
  position: fixed;
  display: flex;
  align-items: center;
  height: 64px;
  width: 100%;
  background: rgba(3, 6, 32, 0.55);
  backdrop-filter: blur(24px) saturate(1.5);
  -webkit-backdrop-filter: blur(24px) saturate(1.5);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  z-index: 9999;
  padding: 0 2rem 0 0;
  transition: background 0.4s ease, border-color 0.4s ease;
}

.header.scrolled {
  background: rgba(3, 6, 32, 0.92);
  border-bottom-color: var(--border);
}

.left-part {
  height: auto;
  width: 30%;
  display: flex;
  align-items: center;
}

.right-part {
  justify-content: flex-end;
  display: flex;
  align-items: center;
  height: auto;
  width: 70%;
}

.personal-logo-container {
  height: 64px;
  width: fit-content;
  display: flex;
  align-items: center;
  position: relative;
}

.personal-logo-container .tooltip {
  position: absolute;
  bottom: -26px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(7, 14, 54, 0.96);
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  visibility: hidden;
  white-space: nowrap;
  border: 1px solid var(--border-glow);
}

.personal-logo-container:hover .tooltip {
  visibility: visible;
  z-index: 100000;
}

.personal-logo {
  height: 42px;
  width: auto;
  padding-left: 1.25rem;
}

nav ul {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 0;
}

nav ul li {
  position: relative;
}

nav ul li a {
  display: block;
  padding: 8px 16px;
  color: var(--text-dim);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  transition: color var(--tr);
  cursor: pointer;
  white-space: nowrap;
  position: relative;
}

nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: width var(--tr);
  border-radius: 2px;
}

nav ul li a:hover::after,
nav a.active::after {
  width: calc(100% - 24px);
}

nav ul li a:hover,
nav a.active {
  color: var(--accent);
}

nav ul ul.dropdown-list {
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 130px;
  background: rgba(7, 14, 54, 0.97);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: none;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
  padding: 4px 0;
}

nav ul ul.dropdown-list li {
  display: block;
}

nav ul ul.dropdown-list li a {
  padding: 9px 18px;
  font-size: 11px;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

nav ul ul.dropdown-list li:last-child a {
  border-bottom: none;
}

nav ul ul.dropdown-list li a::after {
  display: none;
}

nav ul li:hover ul.dropdown-list {
  display: block;
}

#checkbtn {
  font-size: 20px;
  color: var(--text);
  cursor: pointer;
  line-height: 64px;
  display: none;
  float: right;
  padding: 0 4px;
}

#check {
  display: none;
}

#check:checked ~ ul {
  left: 0 !important;
}

@media (max-width: 700px) {
  nav ul li a {
    font-size: 12px;
    padding: 8px 10px;
  }
}

@media (max-width: 590px) {
  #checkbtn {
    display: block;
  }

  nav {
    position: relative;
    width: 100%;
  }

  nav ul {
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: 28px;
    right: 0;
    width: 190px;
    background: rgba(7, 14, 54, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 6px 0;
    left: -600%;
    transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1001;
    gap: 0;
  }

  nav ul li {
    display: block;
    width: 100%;
  }

  nav ul li a {
    padding: 11px 18px;
    font-size: 12px;
    text-align: left;
  }

  nav ul li a::after {
    display: none;
  }

  nav ul ul.dropdown-list {
    position: static;
    transform: none;
    border: none;
    border-radius: 0;
    background: rgba(0, 200, 255, 0.05);
    box-shadow: none;
    padding: 2px 0;
    min-width: unset;
    display: none;
  }

  nav ul li:hover ul.dropdown-list {
    display: block;
  }

  #check:checked ~ ul {
    left: auto !important;
  }
}