:root {
  --primary-color: #2563eb;
  --secondary-color: #64748b;
  --accent-color: #f59e0b;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #e2e8f0;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Navigation */
.top-nav {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.nav-brand i {
  color: var(--primary-color);
  font-size: 1.5rem;
}

.nav-actions {
  display: flex;
  gap: 0.5rem;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.875rem;
  font-weight: 500;
}

.nav-btn:hover {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* Main Layout */
.main-container {
  display: grid;
  grid-template-columns: 320px 1fr 360px;
  height: calc(100vh - 64px);
  gap: 0;
}

/* Sidebar */
.sidebar {
  background: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  padding: 1.5rem;
  overflow-y: auto;
  box-shadow: var(--shadow-sm);
}

.sidebar-section {
  margin-bottom: 2rem;
}

.sidebar-section h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-section h3 i {
  color: var(--primary-color);
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.stat-card {
  background: linear-gradient(135deg, var(--primary-color), #3b82f6);
  padding: 1rem;
  border-radius: var(--radius-lg);
  text-align: center;
  color: white;
  box-shadow: var(--shadow-md);
}

.stat-card:nth-child(2) {
  background: linear-gradient(135deg, var(--success-color), #059669);
}

.stat-card:nth-child(3) {
  background: linear-gradient(135deg, var(--warning-color), #d97706);
  grid-column: 1 / -1;
}

.stat-number {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  opacity: 0.9;
  margin-top: 0.25rem;
}

/* Filters */
.filter-group, .control-group {
  margin-bottom: 1rem;
}

.filter-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.filter-select, .control-select, .search-input {
  width: 100%;
  padding: 0.625rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: all 0.2s ease;
}

.filter-select:focus, .control-select:focus, .search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.control-btn {
  width: 100%;
  padding: 0.625rem;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.control-btn:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
}

.control-btn.secondary {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.control-btn.secondary:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Legend */
.legend {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.legend-color {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

.legend-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem 1rem;
}

.graph-legends {
  display: flex;
  gap: 2rem;
  margin: 1rem 0;
  flex-wrap: wrap;
  align-items: flex-start;
}

.legend-group {
  min-width: 180px;
}

/* Content Area */
.content-area {
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
}

.graph-header {
  padding: 2rem;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
}

.graph-header h1 {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.graph-header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

.graph-container {
  flex: 1;
  margin: 1.5rem;
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
}

/* Info Panel */
.info-panel {
  background: var(--bg-primary);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}

.panel-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-header h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.panel-header h3 i {
  color: var(--primary-color);
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.close-btn:hover {
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.panel-content {
  flex: 1;
  padding: 1.5rem;
  overflow-y: auto;
  overflow-x: hidden; /* Prevents horizontal overflow */
  width: 100%;
  box-sizing: border-box;
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 2rem 0;
}

.empty-state i {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* Member Details */
.member-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

.member-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.member-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  font-weight: 600;
}

.member-info h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.member-role {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.member-details {
  display: grid;
  gap: 1rem;
  width: 100%;
  overflow: hidden; /* Ensures container doesn't overflow */
}

.detail-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-sizing: border-box;
  width: 100%;
  min-width: 0; /* Prevents flex items from overflowing */
  overflow: hidden; /* Ensures content doesn't overflow */
}

.detail-item i {
  color: var(--primary-color);
  width: 16px;
  min-width: 16px; /* Prevents icon from shrinking */
  text-align: center;
  flex-shrink: 0; /* Prevents icon from shrinking */
}

.detail-label {
  font-weight: 500;
  color: var(--text-secondary);
  min-width: 80px;
  flex-shrink: 0; /* Prevents label from shrinking */
}

.detail-value {
  color: var(--text-primary);
  word-break: break-word; /* Allows long text to wrap */
  overflow-wrap: break-word; /* Ensures text wraps properly */
  min-width: 0; /* Allows text to shrink and wrap */
}

.skills-container {
  margin-top: 1rem;
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.skill-tag {
  background: var(--primary-color);
  color: white;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
}

.connections-section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.connections-section h5 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.connection-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 0.5rem;
}

.connection-type {
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
}

.type-manages {
  background: #fee2e2;
  color: #991b1b;
}

.type-collaborates {
  background: #dbeafe;
  color: #1e40af;
}

.type-mentored_by {
  background: #fef3c7;
  color: #92400e;
}

.type-coordinates {
  background: #f3e8ff;
  color: #6b21a8;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(8px);
}

.loading-spinner {
  text-align: center;
  color: var(--text-secondary);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--bg-tertiary);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 1400px) {
  .main-container {
    grid-template-columns: 280px 1fr 320px;
  }
}

@media (max-width: 1200px) {
  .main-container {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }
  
  .sidebar {
    display: none;
  }
  
  .info-panel {
    position: fixed;
    top: 64px;
    right: -360px;
    width: 360px;
    height: calc(100vh - 64px);
    transition: right 0.3s ease;
    z-index: 1001;
  }
  
  .info-panel.open {
    right: 0;
  }
}

@media (max-width: 768px) {
  .nav-brand span {
    display: none;
  }
  
  .graph-header {
    padding: 1rem;
  }
  
  .graph-header h1 {
    font-size: 1.5rem;
  }
  
  .graph-container {
    margin: 1rem;
  }
  
  .info-panel {
    width: 100%;
    right: -100%;
  }
}

.graph-legends-overlay {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 10;
  background: rgba(255,255,255,0.95);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  padding: 1rem;
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  align-items: flex-start;
  max-width: 90%;
}