/* WACL interactive task × embodiment gallery */

.gallery-section {
  background: var(--background-secondary);
}

/* Task selector */
.task-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.task-btn {
  background: var(--background-primary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 0.65rem 1.4rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: var(--transition);
  outline: none;
}

.task-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.task-btn.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
  box-shadow: var(--shadow-md);
}

.task-btn:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 3px;
}

/* Embodiment toggle */
.embodiment-toggle {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-bottom: 1.75rem;
}

.embodiment-toggle-inner {
  display: inline-flex;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  background: var(--background-primary);
}

.embodiment-btn {
  background: transparent;
  color: var(--text-secondary);
  border: none;
  padding: 0.55rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: var(--transition);
  outline: none;
  white-space: nowrap;
}

.embodiment-btn:not(:last-child) {
  border-right: 2px solid var(--border-color);
}

.embodiment-btn.active {
  background: var(--primary-color);
  color: white;
}

.embodiment-btn:hover:not(.active) {
  background: var(--background-accent);
  color: var(--text-primary);
}

.embodiment-btn:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: -2px;
}

/* Unconstrained toggle placeholder */
.unconstrained-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.unconstrained-label {
  font-size: 0.85rem;
  color: var(--text-light);
  font-style: italic;
}

.unconstrained-btn {
  background: var(--background-accent);
  color: var(--text-light);
  border: 2px dashed var(--border-color);
  border-radius: var(--border-radius);
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: not-allowed;
  opacity: 0.6;
}

/* Video player area */
.gallery-video-wrapper {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  background: #000;
  aspect-ratio: 16 / 9;
}

.gallery-video-wrapper video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

/* Placeholder overlay shown when video src is missing */
.gallery-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #1a1a2e;
  color: #aaa;
  font-family: 'Inter', sans-serif;
  gap: 0.75rem;
  display: none;
}

.gallery-placeholder .placeholder-icon {
  font-size: 3rem;
  opacity: 0.4;
}

.gallery-placeholder .placeholder-text {
  font-size: 0.95rem;
  opacity: 0.7;
  text-align: center;
  padding: 0 2rem;
}

/* Caption below video */
.gallery-caption {
  max-width: 900px;
  margin: 1.25rem auto 0;
  text-align: center;
}

.gallery-caption .constraint-type {
  display: inline-block;
  background: var(--background-accent);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 0.3rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary-color);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.gallery-caption .caption-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Transition on video swap */
.gallery-video-wrapper.fading {
  opacity: 0;
  transition: opacity 0.15s ease;
}

.gallery-video-wrapper.visible {
  opacity: 1;
  transition: opacity 0.2s ease;
}

/* Comparison section */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}

.comparison-item {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: #000;
}

.comparison-item video {
  width: 100%;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: contain;
}

.comparison-label {
  background: var(--background-primary);
  border-top: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
}

.comparison-label .method-name {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
}

.comparison-label .method-name.wacl {
  color: #16a34a;
}

.comparison-label .method-name.baseline {
  color: #dc2626;
}

.comparison-label .method-desc {
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

/* Placeholder block (used where video/figure not yet available) */
.asset-placeholder {
  background: var(--background-accent);
  border: 2px dashed var(--border-color);
  border-radius: var(--border-radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 2rem;
  text-align: center;
  gap: 0.75rem;
  color: var(--text-light);
}

.asset-placeholder .placeholder-icon {
  font-size: 2.5rem;
  opacity: 0.5;
}

.asset-placeholder .placeholder-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-secondary);
}

.asset-placeholder .placeholder-desc {
  font-size: 0.85rem;
  line-height: 1.5;
  max-width: 320px;
}

/* Stat chip on hero */
.stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  backdrop-filter: blur(8px);
  border-radius: 100px;
  padding: 0.45rem 1.1rem;
  font-size: 1rem;
  font-weight: 700;
  color: white;
  margin-top: 1rem;
}

.stat-chip .stat-number {
  font-size: 1.15rem;
  font-weight: 800;
}

.stat-chip .stat-vs {
  opacity: 0.7;
  font-weight: 500;
  font-size: 0.85rem;
}

/* Responsive */
@media screen and (max-width: 768px) {
  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .task-selector {
    gap: 0.5rem;
  }

  .task-btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }

  .gallery-video-wrapper {
    border-radius: var(--border-radius);
  }
}