#nguyenio-nav-button {
  position: relative;
  z-index: 2000;
  flex-shrink: 0;
  width: 2.75rem;
  height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.75rem;
  border: 1px solid rgb(63 63 70);
  background: rgba(24 24 27 / 0.95);
  color: #fafafa;
  font-size: 1.15rem;
  cursor: pointer;
  box-shadow: 0 10px 25px -12px rgb(0 0 0 / 0.45);
  backdrop-filter: blur(8px);
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

#nguyenio-nav-button:hover {
  background: rgb(39 39 42);
  transform: translateY(-1px);
}

#nguyenio-nav-button[aria-expanded="true"] {
  background: rgb(30 64 175);
  border-color: rgb(59 130 246);
}

#nguyenio-nav-host-fixed {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 2000;
}

#nguyenio-nav-menu {
  position: fixed;
  top: 0;
  right: 1rem;
  z-index: 1999;
  width: 20rem;
  max-width: calc(100vw - 2rem);
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
  border-radius: 1rem;
  border: 1px solid rgb(63 63 70);
  background: rgba(24 24 27 / 0.97);
  color: #e4e4e7;
  box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.55);
  backdrop-filter: blur(12px);
}

#nguyenio-nav-menu.hidden {
  display: none;
}

#nguyenio-nav-menu a {
  color: #e4e4e7;
  text-decoration: none;
}

#nguyenio-nav-menu a:hover {
  color: #fff;
}

.nguyenio-nav-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.8rem 1.1rem;
  border-radius: 0.75rem;
  color: #e4e4e7;
  transition: background 0.15s ease, color 0.15s ease;
}

.nguyenio-nav-link:hover {
  background: rgb(39 39 42);
}

.nguyenio-nav-link.active {
  background: rgb(30 58 138 / 0.35);
  color: #93c5fd;
}

.nguyenio-nav-toggle {
  width: 100%;
  justify-content: space-between;
  background: transparent;
  border: none;
  cursor: pointer;
  font: inherit;
  text-align: left;
  color: #e4e4e7;
}

#nguyenio-nav-menu button.nguyenio-nav-toggle,
#nguyenio-nav-menu button.nguyenio-nav-toggle span {
  color: #e4e4e7;
}

#nguyenio-nav-menu button.nguyenio-nav-toggle:hover,
#nguyenio-nav-menu button.nguyenio-nav-toggle:hover span {
  color: #fff;
}

.nguyenio-submenu {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  margin: 0.15rem 0.35rem 0;
  border-radius: 0.75rem;
  background: rgba(39 39 42 / 0.9);
}

.nguyenio-submenu.open {
  max-height: 420px;
}

.nguyenio-submenu .nguyenio-nav-link {
  padding-left: 2rem;
  font-size: 0.9rem;
}

.nguyenio-nav-divider {
  border-top: 1px solid rgb(63 63 70);
  margin: 0.35rem 0.75rem;
}

.nguyenio-nav-label {
  padding: 0.5rem 1.1rem 0.25rem;
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #71717a;
}

.nguyenio-submenu-chevron {
  transition: transform 0.3s ease;
}

.nguyenio-submenu-chevron.open {
  transform: rotate(180deg);
}