/* ============================================
   ProCode EduPulse — Gamification Styles
   ============================================ */

/* ── Gamification Page Layout ── */
.gamification-page {
  padding: var(--space-6) 0;
  min-height: 100vh;
}

.page-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.page-title {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.page-description {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ── User Stats Overview ── */
.user-stats-overview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.stats-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.stats-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--brand-gradient);
}

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

.level-card::before {
  background: linear-gradient(135deg, #FFD700, #FFA500);
}

.streak-card::before {
  background: linear-gradient(135deg, #FF6B6B, #FF8E53);
}

.gems-card::before {
  background: linear-gradient(135deg, #9B59B6, #8E44AD);
}

.badges-card::before {
  background: linear-gradient(135deg, #3498DB, #2980B9);
}

.stats-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: var(--brand-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--text-2xl);
  flex-shrink: 0;
}

.level-card .stats-icon {
  background: linear-gradient(135deg, #FFD700, #FFA500);
}

.streak-card .stats-icon {
  background: linear-gradient(135deg, #FF6B6B, #FF8E53);
}

.gems-card .stats-icon {
  background: linear-gradient(135deg, #9B59B6, #8E44AD);
}

.badges-card .stats-icon {
  background: linear-gradient(135deg, #3498DB, #2980B9);
}

.stats-content h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.stats-content p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  margin: 0;
}

.xp-progress {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.xp-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.xp-fill {
  height: 100%;
  background: linear-gradient(90deg, #FFD700, #FFA500);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

.xp-text {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ── Gamification Tabs ── */
.gamification-tabs {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  padding: var(--space-1);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab-btn {
  padding: var(--space-3) var(--space-6);
  background: transparent;
  color: var(--text-secondary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-weight: var(--font-medium);
  white-space: nowrap;
  flex-shrink: 0;
}

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

.tab-btn.active {
  background: var(--brand-primary);
  color: white;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* ── Achievements Section ── */
.achievements-section {
  margin-bottom: var(--space-8);
}

.achievements-filters {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--space-2) var(--space-4);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
}

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

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

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-4);
}

.achievement-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

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

.achievement-card.locked {
  opacity: 0.7;
  filter: grayscale(0.5);
}

.achievement-card.unlocked {
  border-color: var(--border-primary);
  box-shadow: 0 0 20px rgba(0, 120, 212, 0.2);
}

.achievement-card.common {
  border-left: 4px solid #95A5A6;
}

.achievement-card.uncommon {
  border-left: 4px solid #27AE60;
}

.achievement-card.rare {
  border-left: 4px solid #3498DB;
}

.achievement-card.epic {
  border-left: 4px solid #9B59B6;
}

.achievement-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-3);
}

.achievement-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.achievement-card.unlocked .achievement-icon {
  background: var(--brand-gradient);
  color: white;
}

.achievement-rarity {
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  text-transform: uppercase;
}

.achievement-rarity.common {
  background: var(--color-success-light);
  color: var(--color-success);
}

.achievement-rarity.uncommon {
  background: rgba(39, 174, 96, 0.2);
  color: #27AE60;
}

.achievement-rarity.rare {
  background: var(--color-info-light);
  color: var(--color-info);
}

.achievement-rarity.epic {
  background: var(--brand-primary-light);
  color: var(--brand-primary);
}

.achievement-name {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.achievement-description {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
  line-height: var(--leading-relaxed);
}

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

.reward-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
}

.achievement-unlocked-date {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-success);
  font-weight: var(--font-medium);
}

.achievement-progress {
  margin-top: var(--space-3);
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--brand-gradient);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* ── Leaderboard Section ── */
.leaderboard-section {
  margin-bottom: var(--space-8);
}

.leaderboard-filters {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.time-filter,
.category-filter {
  padding: var(--space-2) var(--space-3);
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-sm);
  cursor: pointer;
}

.leaderboard-list {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.leaderboard-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.leaderboard-item:last-child {
  border-bottom: none;
}

.leaderboard-item:hover {
  background: var(--bg-card-hover);
}

.leaderboard-item.current-user {
  background: var(--brand-gradient-soft);
  border-color: var(--border-primary);
}

.leaderboard-item.top-1 {
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.1), rgba(255, 215, 0, 0.05));
}

.leaderboard-item.top-2 {
  background: linear-gradient(135deg, rgba(192, 192, 192, 0.1), rgba(192, 192, 192, 0.05));
}

.leaderboard-item.top-3 {
  background: linear-gradient(135deg, rgba(205, 127, 50, 0.1), rgba(205, 127, 50, 0.05));
}

.rank {
  width: 40px;
  text-align: center;
  font-weight: var(--font-bold);
  font-size: var(--text-lg);
  color: var(--text-primary);
}

.rank i {
  font-size: var(--text-xl);
}

.rank-1 {
  color: #FFD700;
}

.rank-2 {
  color: #C0C0C0;
}

.rank-3 {
  color: #CD7F32;
}

.user-info {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--brand-gradient);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-bold);
  font-size: var(--text-sm);
}

.user-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

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

.user-stats {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.user-xp {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--font-semibold);
  color: var(--brand-primary);
}

/* ── Rewards Section ── */
.rewards-section {
  margin-bottom: var(--space-8);
}

.rewards-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.rewards-header h2 {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
}

.gems-balance {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--brand-gradient);
  color: white;
  border-radius: var(--radius-md);
  font-weight: var(--font-semibold);
}

.rewards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-4);
}

.reward-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  transition: all var(--transition-base);
}

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

.reward-card.owned {
  opacity: 0.6;
  border-color: var(--color-success);
}

.reward-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  color: var(--brand-primary);
  flex-shrink: 0;
}

.reward-content {
  flex: 1;
}

.reward-name {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.reward-description {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  margin-bottom: var(--space-2);
  line-height: var(--leading-relaxed);
}

.reward-category {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  background: var(--bg-tertiary);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  text-transform: capitalize;
}

.reward-action {
  flex-shrink: 0;
}

.purchase-btn,
.owned-btn {
  padding: var(--space-2) var(--space-3);
  border: none;
  border-radius: var(--radius-md);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
}

.purchase-btn {
  background: var(--brand-primary);
  color: white;
}

.purchase-btn:hover:not(:disabled) {
  background: var(--brand-primary-dark);
  transform: translateY(-1px);
}

.purchase-btn:disabled {
  background: var(--bg-tertiary);
  color: var(--text-muted);
  cursor: not-allowed;
}

.owned-btn {
  background: var(--color-success);
  color: white;
  cursor: default;
}

/* ── Daily Challenges Section ── */
.daily-challenges-section {
  margin-bottom: var(--space-8);
}

.challenges-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.challenges-header h2 {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.challenges-header p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.challenges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-4);
}

.challenge-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: all var(--transition-base);
}

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

.challenge-card.completed {
  border-color: var(--color-success);
  background: var(--color-success-light);
}

.challenge-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-3);
}

.challenge-name {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.challenge-status {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
}

.challenge-card.completed .challenge-status {
  color: var(--color-success);
}

.challenge-description {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
  line-height: var(--leading-relaxed);
}

.challenge-progress {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.progress-text {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  min-width: 40px;
}

.challenge-rewards {
  display: flex;
  gap: var(--space-3);
}

/* ── Achievement Notification ── */
.achievement-notification {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  transform: translateX(400px);
  transition: transform var(--transition-spring);
}

.achievement-notification.show {
  transform: translateX(0);
}

.achievement-popup {
  background: var(--bg-elevated);
  border: 2px solid var(--brand-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  box-shadow: var(--shadow-xl);
  min-width: 300px;
}

.achievement-popup .achievement-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: var(--brand-gradient);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  animation: pulse-glow 2s ease-in-out infinite;
}

.achievement-details h4 {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.achievement-details p {
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.achievement-popup .achievement-rewards {
  display: flex;
  gap: var(--space-3);
}

.achievement-popup .reward-item {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--brand-primary);
}

/* ── Responsive Design ── */
@media (max-width: 1024px) {
  .user-stats-overview {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
  
  .achievements-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
  
  .rewards-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
  
  .challenges-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .gamification-page {
    padding: var(--space-4) 0;
  }
  
  .page-title {
    font-size: var(--text-3xl);
  }
  
  .user-stats-overview {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  
  .stats-card {
    padding: var(--space-4);
  }
  
  .stats-icon {
    width: 48px;
    height: 48px;
    font-size: var(--text-xl);
  }
  
  .gamification-tabs {
    padding: var(--space-1);
    gap: var(--space-1);
  }
  
  .tab-btn {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
  }
  
  .achievements-filters {
    justify-content: center;
  }
  
  .achievements-grid {
    grid-template-columns: 1fr;
  }
  
  .rewards-header {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }
  
  .rewards-grid {
    grid-template-columns: 1fr;
  }
  
  .reward-card {
    flex-direction: column;
    text-align: center;
    gap: var(--space-3);
  }
  
  .leaderboard-filters {
    flex-direction: column;
  }
  
  .leaderboard-item {
    padding: var(--space-3);
  }
  
  .user-info {
    gap: var(--space-2);
  }
  
  .achievement-notification {
    top: var(--space-4);
    right: var(--space-4);
    left: var(--space-4);
  }
  
  .achievement-popup {
    min-width: auto;
  }
}

@media (max-width: 480px) {
  .page-title {
    font-size: var(--text-2xl);
  }
  
  .stats-content h3 {
    font-size: var(--text-lg);
  }
  
  .achievement-card,
  .reward-card,
  .challenge-card {
    padding: var(--space-4);
  }
  
  .achievement-header,
  .challenge-header {
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .achievement-rewards,
  .challenge-rewards {
    justify-content: center;
  }
  
  .leaderboard-item {
    flex-direction: column;
    text-align: center;
    gap: var(--space-3);
  }
  
  .user-info {
    flex-direction: column;
    text-align: center;
  }
}

/* ── Animations ── */
@keyframes achievementUnlock {
  0% {
    transform: scale(0.8) rotate(-5deg);
    opacity: 0;
  }
  50% {
    transform: scale(1.1) rotate(5deg);
    opacity: 1;
  }
  100% {
    transform: scale(1) rotate(0deg);
    opacity: 1;
  }
}

.achievement-card.unlocked {
  animation: achievementUnlock 0.6s ease-out;
}

@keyframes sparkle {
  0%, 100% {
    opacity: 0;
    transform: scale(0);
  }
  50% {
    opacity: 1;
    transform: scale(1);
  }
}

.achievement-card.unlocked::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255, 215, 0, 0.3) 0%, transparent 70%);
  animation: sparkle 1s ease-out;
  pointer-events: none;
}