/* Dynamic Worlds - Main Stylesheet */

/* CSS Custom Properties (Variables) */
:root {
  /* Brand Colors */
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --primary-300: #93c5fd;
  --primary-400: #60a5fa;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --primary-800: #1e40af;
  --primary-900: #1e3a8a;

  /* Neutral Colors */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* Semantic Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;

  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --bg-overlay: rgba(0, 0, 0, 0.5);

  /* Text Colors */
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --text-inverse: #ffffff;

  /* Border Colors */
  --border-light: #e5e7eb;
  --border-medium: #d1d5db;
  --border-strong: #9ca3af;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* Spacing */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */

  /* Border Radius */
  --radius-sm: 0.25rem;  /* 4px */
  --radius-md: 0.375rem; /* 6px */
  --radius-lg: 0.5rem;   /* 8px */
  --radius-xl: 0.75rem;  /* 12px */
  --radius-2xl: 1rem;    /* 16px */
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Z-Index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-light: #374151;
    --border-medium: #4b5563;
    --border-strong: #6b7280;
  }
}

/* Reset and Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
}

.loading-content {
  text-align: center;
  color: var(--text-inverse);
}

.loading-logo {
  margin-bottom: var(--space-lg);
}

.loading-text {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: var(--space-lg);
  opacity: 0.9;
}

.loading-progress {
  width: 200px;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: 0 auto;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #ffffff 0%, rgba(255, 255, 255, 0.8) 100%);
  border-radius: var(--radius-full);
  animation: loading-progress 2s ease-in-out infinite;
}

@keyframes loading-progress {
  0% { width: 0%; }
  50% { width: 70%; }
  100% { width: 100%; }
}

/* App Container */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Navigation Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  backdrop-filter: blur(8px);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-icon {
  color: var(--primary-600);
}

.nav-menu {
  display: flex;
  gap: var(--space-xs);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-lg);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.nav-item.active {
  background: var(--primary-50);
  color: var(--primary-600);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.sync-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sync-button:hover {
  background: var(--bg-tertiary);
  color: var(--primary-600);
}

.sync-button.syncing {
  animation: rotate 1s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Main Content */
.app-main {
  flex: 1;
  position: relative;
}

.page {
  display: none;
  min-height: calc(100vh - 64px);
}

.page.active {
  display: block;
}

.page-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

/* Hero Section */
.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  margin-bottom: var(--space-3xl);
}

.hero-content {
  max-width: 600px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.highlight {
  color: var(--primary-600);
  position: relative;
}

.highlight::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 8px;
  background: linear-gradient(90deg, var(--primary-200) 0%, var(--primary-400) 100%);
  border-radius: var(--radius-sm);
  opacity: 0.6;
}

.hero-description {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cognitive-bubbles {
  position: relative;
  width: 100%;
  height: 100%;
}

.bubble {
  position: absolute;
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
  color: var(--text-inverse);
  border-radius: var(--radius-full);
  font-weight: 500;
  font-size: 0.875rem;
  box-shadow: var(--shadow-lg);
  animation: float 3s ease-in-out infinite;
}

.bubble-1 {
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.bubble-2 {
  top: 50%;
  right: 15%;
  animation-delay: 1s;
}

.bubble-3 {
  bottom: 30%;
  left: 20%;
  animation-delay: 2s;
}

.bubble-4 {
  top: 10%;
  right: 25%;
  animation-delay: 0.5s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

/* Features Section */
.features-section {
  margin-bottom: var(--space-3xl);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.feature-card {
  padding: var(--space-2xl);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  text-align: center;
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-200);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-50);
  border-radius: var(--radius-xl);
  color: var(--primary-600);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.feature-description {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Stats Section */
.stats-section {
  padding: var(--space-3xl) 0;
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
  border-radius: var(--radius-2xl);
  margin-bottom: var(--space-3xl);
}

.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-xl);
  text-align: center;
}

.stat-item {
  padding: var(--space-lg);
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-600);
  margin-bottom: var(--space-sm);
}

.stat-label {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Page Header */
.page-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.page-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    padding: 0 var(--space-sm);
  }

  .nav-menu {
    gap: var(--space-xs);
  }

  .nav-item {
    padding: var(--space-sm);
    font-size: 0.8rem;
  }

  .nav-item span {
    display: none;
  }

  .hero-section {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    text-align: center;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-description {
    font-size: 1.125rem;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    height: 300px;
  }

  .section-title {
    font-size: 2rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .feature-card {
    padding: var(--space-xl);
  }

  .stats-container {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
  }

  .stat-number {
    font-size: 2rem;
  }

  .page-container {
    padding: var(--space-lg) var(--space-sm);
  }

  .page-title {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn-large {
    width: 100%;
    max-width: 300px;
  }

  .stats-container {
    grid-template-columns: 1fr;
  }

  .cognitive-bubbles {
    transform: scale(0.8);
  }
}

/* Achievements Page */
.achievements-header {
  margin-bottom: var(--space-2xl);
}

.achievements-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-lg);
  padding: var(--space-2xl);
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
  border-radius: var(--radius-xl);
  text-align: center;
}

.summary-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.summary-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-600);
}

.summary-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-xl);
}

.achievement-card {
  padding: var(--space-xl);
  background: var(--bg-primary);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-xl);
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-lg);
  align-items: start;
  transition: all var(--transition-normal);
}

.achievement-card.unlocked {
  border-color: var(--primary-300);
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--bg-primary) 100%);
  box-shadow: var(--shadow-md);
}

.achievement-card.locked {
  opacity: 0.7;
  border-color: var(--gray-200);
}

.achievement-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.achievement-icon .icon-wrapper {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xl);
  font-size: 1.5rem;
  font-weight: bold;
}

.achievement-card.unlocked .icon-wrapper.unlocked {
  background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

.achievement-card.locked .icon-wrapper.locked {
  background: var(--gray-200);
  color: var(--gray-400);
}

.achievement-info {
  flex: 1;
}

.achievement-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.achievement-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-md);
}

.achievement-progress {
  margin-bottom: var(--space-md);
}

.achievement-progress .progress-bar {
  height: 8px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-xs);
}

.achievement-progress .progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-500) 0%, var(--primary-600) 100%);
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

.achievement-progress .progress-text {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.achievement-unlocked .unlocked-date {
  font-size: 0.75rem;
  color: var(--success);
  font-weight: 500;
}

.achievement-locked .unlock-hint {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-style: italic;
}

.achievement-rewards {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

.reward-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.reward-icon {
  font-size: 0.875rem;
}

.reward-value {
  color: var(--primary-600);
}

/* Leaderboard Page */
.leaderboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.leaderboard-filters {
  display: flex;
  gap: var(--space-sm);
}

.filter-btn {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border-light);
  background: var(--bg-primary);
  color: var(--text-secondary);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.filter-btn.active {
  background: var(--primary-600);
  color: var(--text-inverse);
  border-color: var(--primary-600);
}

.current-user-rank {
  margin-bottom: var(--space-xl);
}

.rank-card {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: var(--space-lg);
  align-items: center;
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
}

.rank-card.highlight {
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--bg-primary) 100%);
  border-color: var(--primary-300);
  box-shadow: var(--shadow-md);
}

.rank-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.rank-position {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  min-width: 60px;
  text-align: center;
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.user-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 1.125rem;
  background: var(--primary-100);
  color: var(--primary-600);
}

.user-avatar.diamond {
  background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
  color: #0369a1;
}

.user-avatar.platinum {
  background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
  color: #374151;
}

.user-avatar.gold {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  color: #d97706;
}

.user-avatar.silver {
  background: linear-gradient(135deg, #f3f4f6 0%, #d1d5db 100%);
  color: #6b7280;
}

.user-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.user-name {
  font-weight: 600;
  color: var(--text-primary);
}

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

.rank-stats {
  display: flex;
  gap: var(--space-lg);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.stat-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.rank-change {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.875rem;
  font-weight: 600;
  min-width: 40px;
  justify-content: center;
}

.rank-change.up {
  color: var(--success);
}

.rank-change.down {
  color: var(--error);
}

.rank-change.same {
  color: var(--text-tertiary);
}

.leaderboard-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* Invitation Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-primary);
  border-radius: var(--radius-2xl);
  max-width: 480px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: scale(0.9);
  transition: transform var(--transition-normal);
}

.modal.active .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: var(--space-xl);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-body {
  padding: var(--space-xl);
}

.invitation-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  text-align: center;
}

.stat-number-bold {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-600);
  margin-bottom: var(--space-xs);
}

.stat-label-small {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.share-section {
  margin-bottom: var(--space-xl);
}

.section-title-small {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.link-input-group {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.link-input {
  flex: 1;
  padding: var(--space-md);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.share-buttons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  border: 1px solid var(--border-light);
  background: var(--bg-primary);
  color: var(--text-primary);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.share-btn:hover {
  background: var(--bg-tertiary);
  transform: translateY(-1px);
}

.share-btn.primary {
  background: var(--primary-600);
  color: var(--text-inverse);
  border-color: var(--primary-600);
}

.share-btn.primary:hover {
  background: var(--primary-700);
}

.qr-section {
  text-align: center;
}

#qrcode {
  display: flex;
  justify-content: center;
  margin: var(--space-lg) 0;
}

.qr-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xl);
  border: 2px dashed var(--border-medium);
  border-radius: var(--radius-xl);
  background: var(--bg-secondary);
}

.qr-icon {
  font-size: 3rem;
  margin-bottom: var(--space-sm);
}

.qr-placeholder p {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.qr-placeholder small {
  color: var(--text-tertiary);
  font-size: 0.75rem;
}

/* Share Success Modal */
.share-success-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
}

.success-stat-item {
  text-align: center;
}

.success-stat-number {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--success);
  margin-bottom: var(--space-xs);
}

.success-stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.rewards-summary {
  padding: var(--space-lg);
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
  border-radius: var(--radius-xl);
  text-align: center;
}

.rewards-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.rewards-list {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
}

.reward-summary-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 600;
  color: var(--primary-600);
}

/* Book Page Styles */
.book-content {
  max-width: 800px;
  margin: 0 auto;
}

.book-intro {
  margin-bottom: var(--space-3xl);
}

.book-hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-2xl);
  align-items: start;
  padding: var(--space-2xl);
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--primary-200);
}

.book-cover {
  display: flex;
  justify-content: center;
  align-items: center;
}

.book-cover-placeholder {
  width: 120px;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.book-info {
  padding: var(--space-lg) 0;
}

.book-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.book-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

.book-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.book-author,
.book-category {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  font-style: italic;
}

.book-concepts,
.cognitive-biases,
.game-design,
.educational-value {
  margin-bottom: var(--space-3xl);
}

.book-concepts h3,
.cognitive-biases h3,
.game-design h3,
.educational-value h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
  text-align: center;
}

.concepts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
}

.concept-card {
  padding: var(--space-xl);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
}

.concept-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}

.concept-card h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.concept-card p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.biases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.bias-category {
  padding: var(--space-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
}

.bias-category:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-200);
}

.bias-category h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--primary-600);
  margin-bottom: var(--space-md);
}

.bias-category ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.bias-category li {
  padding: var(--space-xs) 0;
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border-light);
}

.bias-category li:last-child {
  border-bottom: none;
}

.bias-category li::before {
  content: "•";
  color: var(--primary-500);
  font-weight: bold;
  margin-right: var(--space-sm);
}

.design-principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.principle-group {
  padding: var(--space-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
}

.principle-group:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-200);
}

.principle-group h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--primary-600);
  margin-bottom: var(--space-md);
}

.principle-group ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.principle-group li {
  padding: var(--space-xs) 0;
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border-light);
}

.principle-group li:last-child {
  border-bottom: none;
}

.principle-group li::before {
  content: "✓";
  color: var(--success);
  font-weight: bold;
  margin-right: var(--space-sm);
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.value-card {
  padding: var(--space-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
}

.value-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-200);
}

.value-card h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--primary-600);
  margin-bottom: var(--space-md);
}

.value-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.value-card li {
  padding: var(--space-xs) 0;
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border-light);
}

.value-card li:last-child {
  border-bottom: none;
}

.value-card li::before {
  content: "→";
  color: var(--primary-500);
  font-weight: bold;
  margin-right: var(--space-sm);
}

.conclusion {
  padding: var(--space-2xl);
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--primary-200);
  text-align: center;
}

.conclusion-content h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.conclusion-content p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

/* Responsive Design - Book Page */
@media (max-width: 768px) {
  .book-hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-lg);
    padding: var(--space-lg);
  }

  .book-info {
    padding: var(--space-md) 0;
  }

  .book-title {
    font-size: 1.5rem;
  }

  .concepts-grid,
  .biases-grid,
  .design-principles,
  .value-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .action-buttons {
    flex-direction: column;
    align-items: center;
  }

  .action-buttons .btn {
    width: 100%;
    max-width: 300px;
  }
}

/* Responsive Design - Social Features */
@media (max-width: 768px) {
  .achievements-summary {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    padding: var(--space-lg);
  }

  .summary-number {
    font-size: 2rem;
  }

  .achievements-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .achievement-card {
    grid-template-columns: auto 1fr;
    gap: var(--space-md);
    padding: var(--space-lg);
  }

  .achievement-rewards {
    grid-column: 1 / -1;
    flex-direction: row;
    justify-content: center;
  }

  .leaderboard-header {
    flex-direction: column;
    align-items: stretch;
  }

  .leaderboard-filters {
    justify-content: center;
  }

  .rank-card {
    grid-template-columns: auto 1fr auto;
    gap: var(--space-md);
    padding: var(--space-md);
  }

  .rank-stats {
    display: none;
  }

  .modal-content {
    width: 95%;
    margin: var(--space-md);
  }

  .share-buttons {
    grid-template-columns: 1fr;
  }

  .invitation-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
  }
}

@media (max-width: 480px) {
  .achievements-summary {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .summary-number {
    font-size: 1.5rem;
  }

  .achievement-card {
    padding: var(--space-md);
  }

  .rank-position {
    font-size: 1.25rem;
    min-width: 40px;
  }

  .user-avatar {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  .modal-header,
  .modal-body {
    padding: var(--space-lg);
  }

  .invitation-stats {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .link-input-group {
    flex-direction: column;
  }
}

/* About Page Styles */
.about-content {
  max-width: 900px;
  margin: 0 auto;
}

.about-intro {
  margin-bottom: var(--space-3xl);
}

.about-hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-2xl);
  align-items: start;
  padding: var(--space-2xl);
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--primary-200);
}

.about-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.cognitive-network {
  position: relative;
  animation: gentle-pulse 4s ease-in-out infinite;
}

@keyframes gentle-pulse {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 1; }
}

.about-info {
  padding: var(--space-lg) 0;
}

.about-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.2;
}

.about-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

.about-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.about-focus,
.about-lab {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  font-style: italic;
}

.cognitive-blindness,
.failure-logic-significance,
.agentpsy-lab,
.multi-agent-systems {
  margin-bottom: var(--space-3xl);
}

.cognitive-blindness h3,
.failure-logic-significance h3,
.agentpsy-lab h3,
.multi-agent-systems h3 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
  text-align: center;
}

.blindness-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.blindness-card {
  padding: var(--space-2xl);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.blindness-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}

.blindness-card h4 {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--primary-600);
  margin-bottom: var(--space-lg);
  text-align: center;
}

.comparison {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.human-side,
.ai-side {
  background: var(--bg-secondary);
  padding: var(--space-lg);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
}

.human-side h5,
.ai-side h5 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  text-align: center;
}

.human-side {
  border-color: var(--warning-200, #fde68a);
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
}

.ai-side {
  border-color: var(--info-200, #bfdbfe);
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
}

.human-side ul,
.ai-side ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.human-side li,
.ai-side li {
  padding: var(--space-sm) 0;
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border-light);
}

.human-side li:last-child,
.ai-side li:last-child {
  border-bottom: none;
}

.vs-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: center;
}

.vs-circle {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
  color: var(--text-inverse);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: var(--shadow-md);
}

.common-challenges {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.challenge-item {
  display: flex;
  align-items: start;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  transition: all var(--transition-normal);
}

.challenge-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-200);
}

.challenge-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-50);
  border-radius: var(--radius-lg);
}

.challenge-content h5 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.challenge-content p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.significance-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.significance-narrative {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.narrative-block {
  padding: var(--space-xl);
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
}

.narrative-block h4 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-600);
  margin-bottom: var(--space-md);
}

.narrative-block p {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 1rem;
}

.significance-implications {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.implication-card {
  padding: var(--space-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
}

.implication-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-200);
}

.implication-card h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--primary-600);
  margin-bottom: var(--space-md);
}

.implication-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.implication-card li {
  padding: var(--space-xs) 0;
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border-light);
}

.implication-card li:last-child {
  border-bottom: none;
}

.implication-card li::before {
  content: "•";
  color: var(--primary-500);
  font-weight: bold;
  margin-right: var(--space-sm);
}

.lab-introduction {
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--bg-secondary) 100%);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--primary-200);
  padding: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.lab-hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-xl);
  align-items: center;
  margin-bottom: var(--space-2xl);
}

.lab-logo {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: gentle-rotate 8s linear infinite;
}

@keyframes gentle-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.lab-info h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary-600);
  margin-bottom: var(--space-sm);
}

.lab-mission {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.lab-focus-areas h3,
.lab-vision h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
  text-align: center;
}

.focus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.focus-item {
  padding: var(--space-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  text-align: center;
  transition: all var(--transition-normal);
}

.focus-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}

.focus-icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.focus-item h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.focus-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.vision-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.vision-statement {
  padding: var(--space-xl);
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
}

.vision-statement h4 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-600);
  margin-bottom: var(--space-md);
}

.vision-statement p {
  color: var(--text-secondary);
  line-height: 1.7;
}

.vision-pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
}

.pillar-item {
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  text-align: center;
  transition: all var(--transition-normal);
}

.pillar-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.pillar-item h5 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.pillar-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.lab-call-to-action {
  text-align: center;
  padding: var(--space-2xl);
  background: linear-gradient(135deg, var(--primary-100) 0%, var(--primary-50) 100%);
  border-radius: var(--radius-xl);
  border: 1px solid var(--primary-200);
}

.cta-content h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.cta-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

.future-vision {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

.vision-timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.timeline-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-lg);
  align-items: center;
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  transition: all var(--transition-normal);
}

.timeline-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.timeline-marker {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-inverse);
  flex-shrink: 0;
}

.timeline-marker.current {
  background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
}

.timeline-marker.developing {
  background: linear-gradient(135deg, var(--warning) 0%, #d97706 100%);
}

.timeline-marker.future {
  background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
}

.timeline-content h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.timeline-content p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.system-benefits h4 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  text-align: center;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
}

.benefit-card {
  padding: var(--space-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  text-align: center;
  transition: all var(--transition-normal);
}

.benefit-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}

.benefit-card h5 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.benefit-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.conclusion {
  padding: var(--space-2xl);
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--primary-200);
  text-align: center;
}

.conclusion-content h3 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.conclusion-content > p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.key-insights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.insight-item {
  padding: var(--space-lg);
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  transition: all var(--transition-normal);
}

.insight-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-200);
}

.insight-item h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--primary-600);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.insight-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.final-message {
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-xl);
  border: 1px solid var(--primary-200);
}

.final-message p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Responsive Design - About Page */
@media (max-width: 768px) {
  .about-hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-lg);
    padding: var(--space-lg);
  }

  .about-info {
    padding: var(--space-md) 0;
  }

  .about-title {
    font-size: 1.75rem;
  }

  .comparison {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .vs-divider {
    order: -1;
    margin-bottom: var(--space-md);
  }

  .vs-circle {
    width: 50px;
    height: 50px;
    font-size: 0.875rem;
  }

  .common-challenges {
    grid-template-columns: 1fr;
  }

  .significance-implications,
  .focus-grid,
  .vision-pillars,
  .benefits-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .lab-hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-md);
  }

  .timeline-item {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-md);
  }

  .timeline-marker {
    margin: 0 auto;
  }

  .key-insights {
    grid-template-columns: 1fr;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }

  .cta-actions .btn {
    width: 100%;
    max-width: 300px;
  }
}

@media (max-width: 480px) {
  .about-title {
    font-size: 1.5rem;
  }

  .blindness-card,
  .narrative-block,
  .implication-card,
  .focus-item,
  .pillar-item,
  .timeline-item,
  .benefit-card,
  .insight-item {
    padding: var(--space-md);
  }

  .lab-introduction {
    padding: var(--space-lg);
  }

  .conclusion {
    padding: var(--space-lg);
  }

  .challenge-item {
    flex-direction: column;
    text-align: center;
    gap: var(--space-sm);
  }
}