/* Clusters CSS - Sophisticated Data Chip Design */

/* Cluster section */
.clusters-section {
  overflow: visible;
  position: relative;
}

/* Subtle background accent */
.clusters-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 400px;
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--color-primary) 3%, transparent) 0%,
    transparent 100%
  );
  pointer-events: none;
  z-index: 0;
}

.clusters-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
  position: relative;
  z-index: 1;
}

/* Mega cluster (consolidated groups) */
.mega-cluster {
  position: relative;
}

.mega-cluster-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.mega-cluster-indicator {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
  margin-top: 4px;
}

.mega-cluster-info {
  flex: 1;
}

.mega-cluster-name {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.mega-cluster-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0;
}

.cluster-count {
  font-size: var(--text-base);
  font-family: var(--font-mono);
  font-weight: var(--font-semibold);
  color: var(--color-text-muted);
  margin-left: auto;
}

/* Legacy single cluster (keeping for reference) */
.cluster {
  position: relative;
}

.cluster-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.cluster-indicator {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex-shrink: 0;
}

.cluster-name {
  font-size: var(--text-base);
  font-weight: var(--font-bold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text);
}

/* Bubble container */
.bubble-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

/* Individual bubble - clean chip design */
.bubble {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 13px;
  font-family: var(--font-mono);
  font-weight: var(--font-medium);
  white-space: nowrap;
  background: var(--color-bg-elevated);
  color: var(--color-text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.bubble:hover {
  background: var(--color-bg-subtle);
  color: var(--color-text);
  border-color: var(--color-text);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.12);
}

.bubble:active {
  transform: translateY(0) scale(0.98);
  background: var(--color-bg-subtle);
  border-color: var(--color-text);
}

/* Touch feedback for mobile */
@media (hover: none) and (pointer: coarse) {
  .bubble:active {
    background: var(--color-bg-subtle);
    border-color: var(--color-text);
    transform: scale(0.97);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  }
}

/* Bubble link indicators */
.bubble-icons {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 6px;
  opacity: 0.4;
}

.bubble-icon {
  flex-shrink: 0;
}

.bubble:hover .bubble-icons {
  opacity: 0.7;
}

/* All bubbles same size - no variation */
.bubble-large,
.bubble-small {
  /* Same as base */
}

/* All bubbles share same neutral style - color only on hover via JS/inline */
.bubble-simulation,
.bubble-dashboards,
.bubble-ai-first,
.bubble-ai-cad,
.bubble-backend,
.bubble-utilities,
.bubble-teaching,
.bubble-research,
.bubble-hackathons {
  /* All same base style */
}

/* Selected bubble */
.bubble.selected {
  background: var(--color-text);
  color: var(--color-bg);
}

/* Rich Preview Card */
.preview-card {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  width: 400px;
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.2);
  z-index: var(--z-tooltip);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  pointer-events: none;
  overflow: hidden;
}

.preview-card.visible {
  opacity: 1;
  visibility: visible;
}

.preview-media {
  width: 100%;
  height: 200px;
  background-size: cover;
  background-position: center;
  position: relative;
  overflow: hidden;
}

.preview-media-contain {
  background-size: contain;
  background-repeat: no-repeat;
}

/* Video in preview - handles vertical videos */
.preview-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background-color: var(--color-bg-subtle);
}

/* Vertical video indicator */
.preview-media-vertical {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-subtle);
}

.preview-video-vertical {
  width: auto;
  height: 100%;
  max-width: 100%;
  object-fit: contain;
}

/* Video loading state */
.preview-video-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-subtle);
}

.preview-video-loading::after {
  content: '';
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-text);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Gradient overlay on preview media */
.preview-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 50%, var(--color-bg-elevated));
  pointer-events: none;
}

.preview-media-icon {
  font-size: var(--text-4xl);
  font-family: var(--font-mono);
  font-weight: var(--font-bold);
  color: rgba(255, 255, 255, 0.2);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.preview-youtube-indicator {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.3);
  z-index: 1;
}

.preview-youtube-indicator svg {
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.5));
  opacity: 0.9;
}

.preview-content {
  padding: var(--space-4) var(--space-5) var(--space-5);
}

.preview-pills {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  display: flex;
  gap: var(--space-2);
  z-index: 2;
}

.preview-pill {
  font-size: 10px;
  font-family: var(--font-mono);
  font-weight: var(--font-medium);
  padding: 4px 10px;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(4px);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.preview-title {
  display: block;
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  line-height: 1.3;
  margin-bottom: var(--space-2);
}

.preview-description {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-3);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  white-space: normal;
  word-break: break-word;
}

.preview-awards {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.preview-award {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-family: var(--font-mono);
  color: var(--color-research);
}

.preview-award svg {
  flex-shrink: 0;
}

.preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: var(--space-3);
}

.preview-tag {
  padding: 4px 10px;
  font-size: 11px;
  font-family: var(--font-mono);
  background-color: var(--color-bg-subtle);
  border-radius: var(--radius-sm);
  color: var(--color-text-subtle);
}


/* Mobile: wrap pills, disable hover preview */
@media (max-width: 768px) {
  .bubble-container {
    flex-wrap: wrap;
  }

  .bubble {
    font-size: 12px;
    padding: 8px 12px;
    max-width: calc(100vw - 48px);
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* Hide preview card on mobile - users tap to see full details */
  .preview-card {
    display: none !important;
  }
}

/* Cluster indicator colors - for potential future use */
.cluster-indicator-simulation { background-color: var(--color-simulation); }
.cluster-indicator-dashboards { background-color: var(--color-dashboards); }
.cluster-indicator-ai-first { background-color: var(--color-ai-first); }
.cluster-indicator-ai-cad { background-color: var(--color-ai-cad); }
.cluster-indicator-backend { background-color: var(--color-backend); }
.cluster-indicator-utilities { background-color: var(--color-utilities); }
.cluster-indicator-teaching { background-color: var(--color-teaching); }
.cluster-indicator-research { background-color: var(--color-research); }
.cluster-indicator-hackathons { background-color: var(--color-simulation); }