/* ============================================================
   COMPONENTS LIBRARY
   Buttons, Cards, Progress Bars, Game UI Elements
   ============================================================ */

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn:active {
  transform: scale(0.98);
}

/* Primary Button */
.btn-primary {
  background: linear-gradient(135deg, rgba(79, 140, 255, 0.8), rgba(79, 140, 255, 0.6));
  color: #fff;
  border: 1px solid rgba(79, 140, 255, 0.4);
  box-shadow: 0 4px 16px rgba(79, 140, 255, 0.3),
              inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  background: linear-gradient(135deg, rgba(79, 140, 255, 1), rgba(79, 140, 255, 0.8));
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(79, 140, 255, 0.5);
}

/* Success Button */
.btn-success {
  background: linear-gradient(135deg, rgba(50, 212, 137, 0.8), rgba(50, 212, 137, 0.6));
  color: #fff;
  border: 1px solid rgba(50, 212, 137, 0.4);
  box-shadow: 0 4px 16px rgba(50, 212, 137, 0.3);
}

.btn-success:hover {
  background: linear-gradient(135deg, rgba(50, 212, 137, 1), rgba(50, 212, 137, 0.8));
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(50, 212, 137, 0.5);
}

/* Danger Button */
.btn-danger {
  background: linear-gradient(135deg, rgba(255, 79, 106, 0.8), rgba(255, 79, 106, 0.6));
  color: #fff;
  border: 1px solid rgba(255, 79, 106, 0.4);
  box-shadow: 0 4px 16px rgba(255, 79, 106, 0.3);
}

.btn-danger:hover {
  background: linear-gradient(135deg, rgba(255, 79, 106, 1), rgba(255, 79, 106, 0.8));
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 79, 106, 0.5);
}

/* Secondary Button */
.btn-secondary {
  background: rgba(20, 27, 60, 0.8);
  color: var(--text-soft);
  border: 1px solid rgba(138, 150, 197, 0.6);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: rgba(30, 37, 75, 0.9);
  color: #fff;
  border-color: rgba(138, 150, 197, 0.8);
}

/* Icon Button */
.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  font-size: 1.2rem;
}

/* ============================================================
   CARDS
   ============================================================ */

.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(79, 140, 255, 0.2);
  padding: var(--space-lg);
  box-shadow: var(--shadow-lg),
              inset 0 1px 0 rgba(255, 255, 255, 0.05);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(79, 140, 255, 0.1), transparent);
  transition: left 0.6s;
}

.card:hover::before {
  left: 100%;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(79, 140, 255, 0.4);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5),
              0 0 20px rgba(79, 140, 255, 0.3);
}

/* Trainer Card (for hub page) */
.trainer-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  text-align: center;
  padding: var(--space-xl);
  cursor: pointer;
  text-decoration: none;
}

.trainer-card .emoji {
  font-size: 3rem;
  animation: bounce 2s ease-in-out infinite;
}

.trainer-card h3 {
  font-size: 1.3rem;
  margin-bottom: var(--space-xs);
}

.trainer-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ============================================================
   PROGRESS & STATS
   ============================================================ */

/* Progress Bar */
.progress {
  width: 100%;
  height: 12px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-success));
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
  position: relative;
  overflow: hidden;
}

.progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: shimmer 2s infinite;
}

/* Streak Counter */
.streak {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 6px 12px;
  background: rgba(255, 165, 77, 0.2);
  border: 1px solid rgba(255, 165, 77, 0.5);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-warning);
  animation: glow 2s ease-in-out infinite;
}

.streak.hidden {
  display: none;
}

/* Lives Counter */
.lives {
  display: flex;
  gap: var(--space-xs);
  font-size: 1.5rem;
}

.lives .heart {
  transition: all var(--transition-fast);
}

.lives .heart.lost {
  opacity: 0.3;
  filter: grayscale(100%);
}

/* Score Display */
.score {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 16px;
  background: rgba(79, 140, 255, 0.15);
  border: 1px solid rgba(79, 140, 255, 0.4);
  border-radius: var(--radius-full);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
}

/* ============================================================
   GAME UI
   ============================================================ */

/* Question Card */
.question {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.4;
  animation: fadeIn 0.3s ease-out;
}

.question .blank {
  display: inline-block;
  min-width: 100px;
  padding: 4px 16px;
  margin: 0 8px;
  border-bottom: 3px dashed rgba(79, 140, 255, 0.5);
  color: var(--accent);
  font-weight: 700;
}

/* Answer Options */
.options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.option {
  padding: 16px 24px;
  background: rgba(10, 15, 35, 0.7);
  border: 2px solid rgba(138, 150, 197, 0.4);
  border-radius: var(--radius-md);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.option::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(79, 140, 255, 0.15), transparent);
  transition: left 0.5s;
}

.option:hover {
  background: rgba(18, 26, 60, 0.8);
  border-color: rgba(79, 140, 255, 0.6);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(79, 140, 255, 0.3);
}

.option:hover::before {
  left: 100%;
}

.option.correct {
  background: rgba(50, 212, 137, 0.2);
  border-color: var(--accent-success);
  color: var(--accent-success);
  animation: correctPulse 0.6s ease-out;
}

@keyframes correctPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.option.wrong {
  background: rgba(255, 79, 106, 0.2);
  border-color: var(--accent-danger);
  color: var(--accent-danger);
  animation: wrongShake 0.5s ease-out;
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}

.option:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

/* Feedback Message */
.feedback {
  margin-top: var(--space-lg);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  animation: slideIn 0.3s ease-out;
}

.feedback.correct {
  background: rgba(50, 212, 137, 0.15);
  border: 1px solid rgba(50, 212, 137, 0.5);
  color: var(--accent-success);
}

.feedback.wrong {
  background: rgba(255, 79, 106, 0.15);
  border: 1px solid rgba(255, 79, 106, 0.5);
  color: var(--accent-danger);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 768px) {
  .btn {
    padding: 10px 20px;
    font-size: 0.9rem;
  }
  
  .question {
    font-size: 1.2rem;
    padding: var(--space-lg);
  }
  
  .options {
    grid-template-columns: 1fr;
  }
  
  .trainer-card .emoji {
    font-size: 2.5rem;
  }
}