/* ─── Tab Bar ────────────────────────────────────────────────── */

.tab-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-sm) var(--gutter);
  background: transparent;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.tab-bar::-webkit-scrollbar { display: none; }

/* glass pill — 콘텐츠 크기만큼만 */
.tab-bar__track {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
  padding: 10px;
  background: rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border-radius: 12px;
}

.tab-bar__btn {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: 8px;
  padding: 0.4rem 1.4rem;
  cursor: pointer;
  white-space: nowrap;
  transition:
    color var(--duration-fast) var(--ease-out),
    background var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
}

.tab-bar__btn:hover:not([aria-selected="true"]) {
  color: var(--text-primary);
}

.tab-bar__btn[aria-selected="true"] {
  background: var(--text-primary);
  color: var(--bg-primary);
}

/* ─── Panel transitions ──────────────────────────────────────── */

.panel {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.panel.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Tablet ─────────────────────────────────────────────────── */

@media (max-width: 1024px) {
  .tab-bar__track {
    padding: 8px;
    gap: 3px;
  }

  .tab-bar__btn {
    font-size: 1rem;
    padding: 0.38rem 1.1rem;
  }
}

/* ─── Mobile ─────────────────────────────────────────────────── */

@media (max-width: 640px) {
  .tab-bar {
    padding: var(--space-sm) var(--space-md);
  }

  .tab-bar__track {
    padding: 6px;
    gap: 2px;
  }

  .tab-bar__btn {
    font-size: 0.88rem;
    padding: 0.35rem 0.9rem;
  }
}

/* ─── Work placeholder ───────────────────────────────────────── */

.tab-placeholder {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--text-tertiary);
  text-align: center;
  padding: var(--space-4xl) 0;
}