.floating-header {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;

  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 2rem;

  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 9999px;

  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.1);
  transition: opacity var(--transition-smooth);
  width: 80%;
  max-width: 1100px;
}

.floating-header.scrolled {
  opacity: 0.4;
}

.floating-header.scrolled:hover {
  opacity: 1;
}

.header-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-color);
  white-space: nowrap;
}

.header-title .title-icon {
  font-size: 1.4rem;
  filter: drop-shadow(0 0 8px var(--accent-glow));
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.floating-header .theme-switcher {
  font-size: 1.1rem;
  padding: 6px 10px;
}

@media (max-width: 640px) {
  .floating-header {
    top: 0.75rem;
    gap: 1rem;
    padding: 0.5rem 1rem;
    width: 90%;
  }
}