.nav-btn {
  position: fixed;
  top: 16px;
  left: 16px;
  display: flex;
  flex-direction: column;
  width: 44px;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid var(--accent, #0cc);
  border-radius: 8px;
  overflow: hidden;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
}

.nav-btn__link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  color: var(--accent, #0cc);
  text-decoration: none;
  transition: color 0.3s, background-color 0.3s;
}

.nav-btn__link:visited { color: var(--accent, #0cc); }
.nav-btn__link:hover { color: #fff; background-color: rgba(255, 255, 255, 0.08); }

.nav-btn__icon { width: 20px; height: 20px; flex-shrink: 0; }

.nav-btn--pill .nav-btn__link:first-child {
  border-bottom: 1px solid var(--accent, #0cc);
}

@media (hover: none) {
  .nav-btn {
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}