/* AeDA Demo Styles */
:root {
  --primary-purple: #8b5cf6;
  --primary-dark: #6b46c1;
  --primary-light: #a78bfa;
  --success-green: #10b981;
  --warning-orange: #f59e0b;
  --gray-900: #111827;
  --gray-800: #1f2937;
  --gray-700: #374151;
  --gray-600: #4b5563;
  --gray-500: #6b7280;
  --gray-400: #9ca3af;
  --gray-300: #d1d5db;
  --gray-200: #e5e7eb;
  --gray-100: #f3f4f6;
  --gray-50: #f9fafb;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
  color: var(--gray-900);
  line-height: 1.6;
}

/* Navigation */
.demo-nav {
  background: white;
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-purple);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  font-size: 1.2rem;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--gray-900);
}

.nav-tabs {
  display: flex;
  gap: 1rem;
}

.nav-tab {
  padding: 0.5rem 1.5rem;
  border: none;
  background: transparent;
  color: var(--gray-600);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.nav-tab:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

.nav-tab.active {
  background: var(--primary-purple);
  color: white;
}

.demo-badge {
  background: linear-gradient(45deg, var(--primary-purple), var(--primary-light));
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

/* Demo Sections */
.demo-section {
  display: none;
  min-height: calc(100vh - 70px);
  padding: 3rem 0;
}

.demo-section.active {
  display: block;
}

.demo-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.demo-header {
  text-align: center;
  margin-bottom: 3rem;
}

.demo-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 1rem;
}

.demo-header p {
  font-size: 1.2rem;
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto;
}

/* Courses Demo */
.search-section {
  background: white;
  border-radius: 16px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.search-bar {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
}

.search-bar input {
  flex: 1;
  padding: 1rem 1.5rem;
  border: 2px solid var(--gray-200);
  border-radius: 12px;
  font-size: 1rem;
  transition: border-color 0.2s ease;
}

.search-bar input:focus {
  outline: none;
  border-color: var(--primary-purple);
}

.search-btn {
  padding: 1rem 2rem;
  background: var(--primary-purple);
  color: white;
  border: none;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease;
}

.search-btn:hover {
  background: var(--primary-dark);
}

.filter-tabs {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.filter-tab {
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--gray-200);
  background: white;
  color: var(--gray-600);
  border-radius: 25px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-weight: 500;
}

.filter-tab:hover {
  border-color: var(--primary-light);
  color: var(--primary-purple);
}

.filter-tab.active {
  background: var(--primary-purple);
  border-color: var(--primary-purple);
  color: white;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.course-card {
  background: white;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.15);
}

.course-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.course-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
  flex: 1;
}

.course-level {
  background: var(--primary-light);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 600;
}

.course-description {
  color: var(--gray-600);
  margin-bottom: 1.5rem;
}

.course-stats {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat {
  background: var(--gray-100);
  color: var(--gray-700);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

.course-progress {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--gray-200);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-purple), var(--primary-light));
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-600);
  min-width: 100px;
}

/* Knowledge Graph Demo */
.knowledge-graph-container {
  background: white;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.graph-controls-section {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.graph-controls {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.control-btn {
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--gray-200);
  background: white;
  color: var(--gray-600);
  border-radius: 25px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-weight: 500;
  font-size: 0.9rem;
}

.control-btn:hover {
  border-color: var(--primary-light);
  color: var(--primary-purple);
  transform: translateY(-1px);
}

.control-btn.active {
  background: var(--primary-purple);
  border-color: var(--primary-purple);
  color: white;
}

.view-options {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.option-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-700);
}

.view-select {
  padding: 0.5rem;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  background: white;
  color: var(--gray-700);
  font-size: 0.9rem;
  cursor: pointer;
}

.knowledge-graph {
  border: 2px solid var(--gray-100);
  border-radius: 12px;
  margin-bottom: 2rem;
  overflow: hidden;
  background: #fafafa;
}

.knowledge-node {
  cursor: pointer;
  transition: transform 0.2s ease;
}

.knowledge-node:hover {
  transform: scale(1.08);
}

.knowledge-node.completed circle {
  animation: completedPulse 2s ease-in-out infinite;
}

.knowledge-node.current circle {
  animation: currentGlow 1.5s ease-in-out infinite alternate;
}

.knowledge-node.available:hover circle {
  stroke: #d97706;
  stroke-width: 4;
}


@keyframes completedPulse {
  0%, 100% { 
    filter: drop-shadow(0 0 5px rgba(16, 185, 129, 0.3)); 
  }
  50% { 
    filter: drop-shadow(0 0 15px rgba(16, 185, 129, 0.6)); 
  }
}

@keyframes currentGlow {
  from { 
    filter: drop-shadow(0 0 5px rgba(139, 92, 246, 0.4)); 
  }
  to { 
    filter: drop-shadow(0 0 15px rgba(139, 92, 246, 0.8)); 
  }
}

.knowledge-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.knowledge-legend {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.knowledge-legend h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 0.5rem;
}

.knowledge-legend::before {
  content: "Learning Status";
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 0.5rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem;
  border-radius: 8px;
  transition: background 0.2s ease;
}

.legend-item:hover {
  background: var(--gray-50);
}

.legend-color {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  flex-shrink: 0;
}

.legend-color.completed {
  background: #10b981;
}

.legend-color.current {
  background: var(--primary-purple);
}

.legend-color.available {
  background: #f59e0b;
}

.legend-color.locked {
  background: var(--gray-300);
}

.knowledge-stats {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.knowledge-stats h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 0.5rem;
}

.knowledge-stats::before {
  content: "Progress Analytics";
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 0.5rem;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem;
  background: var(--gray-50);
  border-radius: 8px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--gray-600);
  font-weight: 500;
}

.stat-value {
  font-size: 0.9rem;
  color: var(--primary-purple);
  font-weight: 600;
}

.knowledge-detail {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  margin-top: 1rem;
  overflow: hidden;
  animation: slideDown 0.3s ease-out;
}

.detail-header {
  background: var(--primary-purple);
  color: white;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.detail-header h4 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.detail-close {
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.detail-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.detail-content {
  padding: 1.5rem;
}

.detail-section {
  margin-bottom: 1.5rem;
}

.detail-section:last-child {
  margin-bottom: 0;
}

.detail-section strong {
  display: block;
  color: var(--gray-900);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.detail-section p {
  color: var(--gray-600);
  line-height: 1.5;
  margin: 0;
}

.detail-section div {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.detail-tag {
  background: var(--primary-purple);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 500;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Knowledge Modal Styles */
.knowledge-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.knowledge-modal-overlay.show {
  opacity: 1;
}

.knowledge-modal-content {
  background: white;
  border-radius: 20px;
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  transform: scale(0.9) translateY(20px);
  transition: transform 0.3s ease;
}

.knowledge-modal-overlay.show .knowledge-modal-content {
  transform: scale(1) translateY(0);
}

.knowledge-modal-header {
  background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
  color: white;
  padding: 1.5rem 2rem;
  border-radius: 20px 20px 0 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.knowledge-modal-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
}

.knowledge-modal-close {
  background: none;
  border: none;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  padding: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.knowledge-modal-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.knowledge-modal-body {
  padding: 2rem;
}

.knowledge-modal-section {
  margin-bottom: 2rem;
}

.knowledge-modal-section:last-child {
  margin-bottom: 0;
}

.knowledge-modal-section h4 {
  margin: 0 0 1rem 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gray-800);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.knowledge-modal-section p {
  margin: 0;
  line-height: 1.6;
  color: var(--gray-600);
  font-size: 1rem;
}

.knowledge-modal-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.knowledge-tag {
  padding: 0.5rem 1rem;
  border-radius: 25px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: transform 0.2s ease;
}

.knowledge-tag:hover {
  transform: translateY(-2px);
}

.knowledge-tag.prerequisite {
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  color: white;
}

.knowledge-tag.resource {
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
}

.knowledge-tag.problem {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: white;
}

.no-prerequisites {
  color: var(--success);
  font-weight: 600;
  font-size: 0.95rem;
}

.knowledge-modal-footer {
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--gray-200);
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}

.knowledge-modal-button {
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  font-size: 0.95rem;
}

.knowledge-modal-button.primary {
  background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
  color: white;
}

.knowledge-modal-button.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(139, 92, 246, 0.3);
}

.knowledge-modal-button.secondary {
  background: var(--gray-100);
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
}

.knowledge-modal-button.secondary:hover {
  background: var(--gray-200);
  transform: translateY(-1px);
}

/* Mobile responsive */
@media (max-width: 768px) {
  .knowledge-modal-content {
    width: 95%;
    margin: 1rem;
  }
  
  .knowledge-modal-header {
    padding: 1rem 1.5rem;
  }
  
  .knowledge-modal-body {
    padding: 1.5rem;
  }
  
  .knowledge-modal-footer {
    padding: 1rem 1.5rem;
    flex-direction: column;
  }
  
  .knowledge-modal-button {
    width: 100%;
  }
}

/* Academic Program Demo */
.academic-dashboard {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.program-overview {
  background: white;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.overview-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.stat-card {
  background: linear-gradient(135deg, var(--primary-purple), var(--primary-light));
  color: white;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.2);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.95rem;
  opacity: 0.9;
  font-weight: 500;
}

.course-catalog {
  background: white;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.course-catalog h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 2rem;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.course-item {
  background: var(--gray-50);
  border-radius: 12px;
  padding: 1.5rem;
  border-left: 4px solid;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.course-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

/* Course category colors */
.course-item.foundation {
  border-left-color: #3B82F6;
}

.course-item.programming {
  border-left-color: #10B981;
}

.course-item.mathematics {
  border-left-color: #F59E0B;
}

.course-item.systems {
  border-left-color: #EF4444;
}

.course-item.algorithms {
  border-left-color: var(--primary-purple);
}

.course-item.engineering {
  border-left-color: #06B6D4;
}

.course-item.theory {
  border-left-color: #EC4899;
}

.course-item.capstone {
  border-left-color: #84CC16;
}

.course-code {
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary-purple);
  margin-bottom: 0.5rem;
}

.course-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 1rem;
}

.course-details {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.credits {
  background: var(--primary-purple);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 600;
}

.level {
  background: var(--gray-200);
  color: var(--gray-700);
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 500;
}

.course-description {
  color: var(--gray-600);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 1rem;
}

.prerequisites {
  font-size: 0.8rem;
}

.prereq-label {
  font-weight: 600;
  color: var(--gray-700);
}

.prereq {
  color: var(--primary-purple);
  font-weight: 500;
}

.no-prereq {
  color: var(--success-green);
  font-weight: 500;
}

.path-planner {
  background: white;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.path-planner h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 2rem;
}

.semester-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.semester-card {
  background: var(--gray-50);
  border-radius: 12px;
  padding: 1.5rem;
  border: 2px solid var(--gray-200);
  transition: border-color 0.2s ease;
}

.semester-card:hover {
  border-color: var(--primary-light);
}

.semester-header {
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 1rem;
  text-align: center;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--gray-200);
}

.semester-courses {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.semester-course {
  padding: 0.5rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  text-align: center;
  color: white;
}

.semester-course.foundation {
  background: #3B82F6;
}

.semester-course.programming {
  background: #10B981;
}

.semester-course.mathematics {
  background: #F59E0B;
}

.semester-course.systems {
  background: #EF4444;
}

.semester-course.algorithms {
  background: var(--primary-purple);
}

.semester-course.engineering {
  background: #06B6D4;
}

.semester-course.theory {
  background: #EC4899;
}

.semester-course.capstone {
  background: #84CC16;
}

.semester-credits {
  text-align: center;
  font-weight: 600;
  color: var(--gray-600);
  font-size: 0.9rem;
}

.course-groups {
  background: white;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.course-groups h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 2rem;
}

.groups-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.group-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--gray-50);
  border-radius: 8px;
  border: 1px solid var(--gray-200);
}

.group-color {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  flex-shrink: 0;
}

.group-item.foundation .group-color {
  background: #3B82F6;
}

.group-item.programming .group-color {
  background: #10B981;
}

.group-item.mathematics .group-color {
  background: #F59E0B;
}

.group-item.systems .group-color {
  background: #EF4444;
}

.group-item.algorithms .group-color {
  background: var(--primary-purple);
}

.group-item.engineering .group-color {
  background: #06B6D4;
}

.group-name {
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 0.25rem;
}

.group-desc {
  font-size: 0.8rem;
  color: var(--gray-600);
}

/* API Explorer Demo */
.api-explorer {
  background: white;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.api-input-section {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  align-items: end;
}

.api-input-group {
  flex: 1;
}

.api-input-group label {
  display: block;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 0.5rem;
}

.api-input-group input {
  width: 100%;
  padding: 1rem;
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  font-family: 'Courier New', monospace;
  background: var(--gray-50);
}

.explore-btn {
  padding: 1rem 2rem;
  background: var(--primary-purple);
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease;
}

.explore-btn:hover {
  background: var(--primary-dark);
}

.api-endpoints h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 1.5rem;
}

.endpoint-item {
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  margin-bottom: 1rem;
  overflow: hidden;
}

.endpoint-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}

.method {
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.8rem;
  min-width: 60px;
  text-align: center;
}

.method.get {
  background: var(--success-green);
  color: white;
}

.method.post {
  background: var(--warning-orange);
  color: white;
}

.endpoint-path {
  font-family: 'Courier New', monospace;
  color: var(--gray-700);
  flex: 1;
}

.endpoint-status.success {
  background: var(--success-green);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}

.endpoint-description {
  padding: 1rem 1.5rem;
  color: var(--gray-600);
  background: white;
}

.endpoint-response {
  padding: 1.5rem;
  background: var(--gray-900);
  border-top: 1px solid var(--gray-200);
}

.endpoint-response pre {
  color: #a78bfa;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.4;
  margin: 0;
  overflow-x: auto;
}

/* Demo Footer */
.demo-footer {
  background: var(--gray-900);
  color: white;
  padding: 3rem 0;
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.footer-content p {
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.back-to-main {
  background: var(--primary-purple);
  color: white;
  border: none;
  padding: 1rem 2rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease;
  margin-top: 1rem;
}

.back-to-main:hover {
  background: var(--primary-dark);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    padding: 0 1rem;
    flex-direction: column;
    height: auto;
    padding: 1rem;
  }
  
  .nav-tabs {
    margin-top: 1rem;
  }
  
  .demo-container {
    padding: 0 1rem;
  }
  
  .demo-header h2 {
    font-size: 2rem;
  }
  
  .courses-grid {
    grid-template-columns: 1fr;
  }
  
  .dashboard-cards {
    grid-template-columns: 1fr;
  }
  
  .api-input-section {
    flex-direction: column;
  }
  
  .search-bar {
    flex-direction: column;
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.demo-section.active {
  animation: fadeIn 0.5s ease-out;
}

.course-card:hover {
  animation: none;
}

/* Interactive Elements */
.knowledge-node circle {
  /* No animations */
}

.chart-bar:hover {
  opacity: 0.8;
  transform: scale(1.05);
  transition: all 0.2s ease;
}