/* ============================================
   THE HUMAN BRAIN ATLAS - HOME PAGE STYLES
   ============================================ */

/* Hero Scroll Indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  z-index: var(--z-content);
}

.scroll-mouse {
  width: 24px;
  height: 40px;
  border: 2px solid var(--color-text-muted);
  border-radius: var(--radius-full);
  display: flex;
  justify-content: center;
  padding-top: 8px;
}

.scroll-wheel {
  width: 4px;
  height: 8px;
  background: var(--color-accent-cyan);
  border-radius: var(--radius-full);
  animation: scrollWheel 1.5s ease-in-out infinite;
}

@keyframes scrollWheel {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(8px); opacity: 0.3; }
}

/* Brain Stats Grid */
.brain-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.brain-stat-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.brain-stat-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-neural);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.brain-stat-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-8px);
}

.brain-stat-card:hover::before {
  opacity: 0.05;
}

.brain-stat-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-neural);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  margin: 0 auto var(--space-6);
  position: relative;
  z-index: 1;
}

.brain-stat-number {
  font-size: var(--text-4xl);
  font-weight: 800;
  font-family: var(--font-mono);
  background: var(--gradient-neural);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-2);
  position: relative;
  z-index: 1;
}

.brain-stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  position: relative;
  z-index: 1;
}

/* Regions Grid */
.section-bg {
  background: var(--color-bg-secondary);
}

.regions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.region-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.region-card-glow {
  position: absolute;
  inset: -1px;
  background: var(--gradient-neural);
  border-radius: var(--radius-xl);
  opacity: 0;
  filter: blur(20px);
  transition: opacity var(--transition-base);
  z-index: -1;
}

.region-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-8px);
}

.region-card:hover .region-card-glow {
  opacity: 0.5;
}

.region-card-icon {
  width: 70px;
  height: 70px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-3xl);
  margin-bottom: var(--space-6);
  transition: transform var(--transition-base);
}

.region-card:hover .region-card-icon {
  transform: scale(1.1) rotate(5deg);
}

.region-card-icon.cortex {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(0, 212, 255, 0.2));
  color: var(--color-accent-blue);
}

.region-card-icon.memory {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(236, 72, 153, 0.2));
  color: var(--color-accent-purple);
}

.region-card-icon.emotion {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(239, 68, 68, 0.2));
  color: var(--color-accent-orange);
}

.region-card-icon.decision {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(0, 212, 255, 0.2));
  color: var(--color-accent-green);
}

.region-card-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.region-card-text {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: 1.7;
  flex-grow: 1;
}

.region-card-arrow {
  margin-top: var(--space-6);
  width: 40px;
  height: 40px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-cyan);
  transition: all var(--transition-base);
}

.region-card:hover .region-card-arrow {
  background: var(--color-accent-cyan);
  color: var(--color-bg-primary);
  transform: translateX(4px);
}

/* Signals Section */
.signals-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.signals-content {
  max-width: 500px;
}

.signals-list {
  margin-top: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.signal-item {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.signal-icon {
  width: 50px;
  height: 50px;
  background: var(--gradient-neural);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  flex-shrink: 0;
}

.signal-info h4 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-1);
}

.signal-info p {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.signals-visual {
  position: relative;
}

.signal-wave-container {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  position: relative;
  overflow: hidden;
}

#signal-canvas {
  width: 100%;
  height: 300px;
}

.signal-overlay {
  position: absolute;
  bottom: var(--space-8);
  left: var(--space-8);
  right: var(--space-8);
  display: flex;
  justify-content: center;
}

.signal-stat {
  background: var(--color-bg-primary);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-8);
  text-align: center;
}

.signal-stat-value {
  font-size: var(--text-3xl);
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--color-accent-cyan);
}

.signal-stat-unit {
  font-size: var(--text-lg);
  color: var(--color-accent-cyan);
  margin-left: var(--space-1);
}

.signal-stat-label {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: var(--space-1);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.feature-card-large {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card-large:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-8px);
}

.feature-card-visual {
  height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  position: relative;
}

/* Neural Preview */
.neural-preview {
  position: relative;
  width: 120px;
  height: 120px;
}

.neural-node {
  position: absolute;
  width: 20px;
  height: 20px;
  background: var(--gradient-neural);
  border-radius: 50%;
  box-shadow: var(--glow-cyan);
}

.neural-node:nth-child(1) { top: 20%; left: 20%; }
.neural-node:nth-child(2) { top: 20%; right: 20%; }
.neural-node:nth-child(3) { bottom: 20%; left: 50%; transform: translateX(-50%); }

.neural-connection {
  position: absolute;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-cyan), var(--color-accent-purple));
  opacity: 0.5;
}

.neural-connection:nth-child(4) {
  width: 60px;
  top: 25%;
  left: 25%;
  transform: rotate(-15deg);
}

.neural-connection:nth-child(5) {
  width: 50px;
  top: 40%;
  left: 30%;
  transform: rotate(45deg);
}

/* Memory Preview */
.memory-preview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  width: 100px;
}

.memory-cell {
  width: 30px;
  height: 30px;
  background: var(--color-bg-tertiary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.memory-cell.active {
  background: var(--gradient-memory);
  border-color: transparent;
  box-shadow: var(--glow-purple);
}

/* Emotion Preview */
.emotion-preview {
  position: relative;
  width: 100px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.emotion-ring {
  position: absolute;
  border: 2px solid;
  border-radius: 50%;
  opacity: 0.3;
}

.emotion-ring:nth-child(1) {
  width: 100%;
  height: 100%;
  border-color: var(--color-accent-orange);
}

.emotion-ring:nth-child(2) {
  width: 70%;
  height: 70%;
  border-color: var(--color-accent-red);
}

.emotion-ring:nth-child(3) {
  width: 40%;
  height: 40%;
  border-color: var(--color-accent-pink);
}

.emotion-center {
  width: 30px;
  height: 30px;
  background: var(--gradient-emotion);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--text-sm);
  box-shadow: var(--glow-pink);
}

.feature-card-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.feature-card-text {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

/* Research Grid */
.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

.research-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
}

.research-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-8px);
}

.research-image {
  height: 180px;
  background: var(--color-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.research-placeholder {
  width: 80px;
  height: 80px;
  background: var(--gradient-neural);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-3xl);
}

.research-content {
  padding: var(--space-6);
}

.research-meta {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.research-date {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.research-tag {
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-2);
  background: rgba(0, 212, 255, 0.1);
  color: var(--color-accent-cyan);
  border-radius: var(--radius-sm);
}

.research-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
  line-height: 1.4;
}

.research-excerpt {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.research-link {
  color: var(--color-accent-cyan);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: gap var(--transition-fast);
}

.research-link:hover {
  gap: var(--space-3);
}

.research-cta {
  text-align: center;
}

/* CTA Section */
.section-cta {
  position: relative;
  background: var(--color-bg-secondary);
  overflow: hidden;
}

.cta-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.cta-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.cta-title {
  font-size: clamp(var(--text-3xl), 5vw, var(--text-5xl));
  margin-bottom: var(--space-6);
}

.cta-description {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
}

.cta-buttons {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

.btn-large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* Responsive */
@media (max-width: 1024px) {
  .brain-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .regions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .signals-layout {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
  
  .signals-content {
    max-width: 100%;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .research-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .brain-stats-grid {
    grid-template-columns: 1fr;
  }
  
  .regions-grid {
    grid-template-columns: 1fr;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .cta-buttons .btn {
    width: 100%;
    max-width: 280px;
  }
}