.sample-bar {
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10000;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.5rem;
  background: rgba(10, 10, 10, 0.92);
  color: #f5f5f5;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  font-family: "Space Mono", "Noto Sans JP", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

.sample-bar-label {
  padding: 0.35rem 0.65rem;
  opacity: 0.55;
  text-transform: uppercase;
  white-space: nowrap;
}

.sample-bar a {
  color: inherit;
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}

.sample-bar a:hover {
  background: rgba(255, 255, 255, 0.12);
}

.sample-bar a.is-active {
  background: #f5f5f5;
  color: #0a0a0a;
  font-weight: 700;
}

.sample-bar a.hub-link {
  margin-left: 0.25rem;
  padding-left: 0.85rem;
  border-left: 1px solid rgba(255, 255, 255, 0.15);
}

@media (max-width: 640px) {
  .sample-bar {
    left: 0.75rem;
    right: 0.75rem;
    transform: none;
    flex-wrap: wrap;
    justify-content: center;
    max-width: calc(100% - 1.5rem);
  }
}