/**
 * 🎯 Irregular Verbs Trainer - Styles
 * Современный дизайн с glassmorphism и анимациями
 */

/* ============================================
   CSS VARIABLES
   ============================================ */

:root {
  /* Colors */
  --iv-primary: #6366f1;
  --iv-primary-light: #818cf8;
  --iv-primary-dark: #4f46e5;
  --iv-secondary: #10b981;
  --iv-accent: #f59e0b;
  --iv-danger: #ef4444;
  --iv-success: #22c55e;
  
  /* Backgrounds */
  --iv-bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --iv-bg-dark: #0f172a;
  --iv-bg-card: rgba(255, 255, 255, 0.95);
  --iv-bg-glass: rgba(255, 255, 255, 0.1);
  
  /* Text */
  --iv-text: #1e293b;
  --iv-text-muted: #64748b;
  --iv-text-light: #ffffff;
  
  /* Shadows */
  --iv-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --iv-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
  --iv-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
  --iv-shadow-glow: 0 0 20px rgba(99, 102, 241, 0.4);
  
  /* Borders */
  --iv-radius-sm: 8px;
  --iv-radius-md: 12px;
  --iv-radius-lg: 20px;
  --iv-radius-xl: 28px;
  
  /* Transitions */
  --iv-transition-fast: 0.15s ease;
  --iv-transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --iv-transition-bounce: 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --iv-bg-card: rgba(30, 41, 59, 0.95);
    --iv-text: #f1f5f9;
    --iv-text-muted: #94a3b8;
  }
}

/* ============================================
   BASE STYLES
   ============================================ */

.iv-container {
  min-height: 100vh;
  background: var(--iv-bg-gradient);
  padding: 1rem;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--iv-text);
}

/* ============================================
   MENU SCREEN
   ============================================ */

.iv-menu {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.iv-header {
  text-align: center;
  margin-bottom: 2rem;
}

.iv-header h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--iv-text-light);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  margin-bottom: 0.5rem;
}

.iv-subtitle {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.9);
}

/* Mode Selector */
.iv-mode-selector {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.iv-mode-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--iv-bg-glass);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--iv-radius-lg);
  cursor: pointer;
  transition: var(--iv-transition);
  backdrop-filter: blur(10px);
}

.iv-mode-option:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.iv-mode-option.active {
  background: rgba(255, 255, 255, 0.3);
  border-color: var(--iv-text-light);
  box-shadow: var(--iv-shadow-glow);
}

.iv-mode-option input {
  display: none;
}

.iv-mode-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.iv-mode-label {
  font-weight: 600;
  color: var(--iv-text-light);
}

/* Sections Grid */
.iv-sections-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.iv-section-card {
  position: relative;
  background: var(--iv-bg-card);
  border-radius: var(--iv-radius-lg);
  padding: 1.5rem;
  cursor: pointer;
  transition: var(--iv-transition);
  box-shadow: var(--iv-shadow-sm);
  overflow: hidden;
}

.iv-section-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--section-color, var(--iv-primary));
}

.iv-section-card:hover:not(.locked) {
  transform: translateY(-4px);
  box-shadow: var(--iv-shadow-lg);
}

.iv-section-card.locked {
  opacity: 0.6;
  cursor: not-allowed;
}

.iv-section-emoji {
  font-size: 3rem;
  margin-bottom: 0.75rem;
}

.iv-section-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--iv-text);
}

.iv-section-example {
  font-family: 'Fira Code', monospace;
  font-size: 0.9rem;
  color: var(--iv-text-muted);
  margin-bottom: 1rem;
}

.iv-section-stats {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--iv-text-muted);
}

.iv-section-stars {
  font-size: 1.2rem;
}

.iv-section-lock {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
}

.iv-section-accuracy {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  background: var(--iv-success);
  color: white;
  font-weight: 600;
  font-size: 0.8rem;
  padding: 0.25rem 0.5rem;
  border-radius: var(--iv-radius-sm);
}

/* Exam Section */
.iv-exam-section {
  text-align: center;
  margin-bottom: 2rem;
}

.iv-exam-btn {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5rem 3rem;
  background: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  border: none;
  border-radius: var(--iv-radius-xl);
  color: white;
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--iv-transition);
  box-shadow: var(--iv-shadow-md);
}

.iv-exam-btn:hover:not(.disabled) {
  transform: scale(1.05);
  box-shadow: var(--iv-shadow-lg);
}

.iv-exam-btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: #94a3b8;
}

.iv-exam-hint {
  font-size: 0.75rem;
  font-weight: 400;
  opacity: 0.8;
  margin-top: 0.25rem;
}

/* Progress Bar */
.iv-progress-bar {
  position: relative;
  height: 40px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--iv-radius-lg);
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.iv-progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--iv-secondary), var(--iv-primary));
  border-radius: var(--iv-radius-lg);
  transition: width 0.5s ease;
}

.iv-progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--iv-text-light);
  font-weight: 600;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* ============================================
   GAME SCREEN
   ============================================ */

.iv-game {
  max-width: 800px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.iv-game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: var(--iv-bg-glass);
  border-radius: var(--iv-radius-lg);
  backdrop-filter: blur(10px);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.iv-lives {
  display: flex;
  gap: 0.25rem;
}

.iv-heart {
  font-size: 1.5rem;
  transition: var(--iv-transition);
}

.iv-heart.lost {
  opacity: 0.3;
  filter: grayscale(1);
}

.iv-game-info {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.iv-pattern-name {
  font-weight: 600;
  color: var(--iv-text-light);
}

.iv-progress {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.8);
}

.iv-score-streak {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.iv-score, .iv-streak {
  font-weight: 700;
  color: var(--iv-text-light);
  font-size: 1.1rem;
}

.iv-streak {
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  padding: 0.25rem 0.5rem;
  border-radius: var(--iv-radius-sm);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

/* Game Main */
.iv-game-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  padding: 1rem;
}

.iv-verb-card {
  background: var(--iv-bg-card);
  border-radius: var(--iv-radius-xl);
  padding: 2.5rem 3rem;
  text-align: center;
  box-shadow: var(--iv-shadow-lg);
  width: 100%;
  max-width: 400px;
}

.iv-verb-v1 {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 900;
  color: var(--iv-primary);
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.iv-verb-transcription {
  font-family: 'Fira Code', monospace;
  font-size: 1.1rem;
  color: var(--iv-text-muted);
  margin-bottom: 0.75rem;
}

.iv-verb-translation {
  font-size: 1.25rem;
  color: var(--iv-text);
  font-weight: 500;
}

/* Question */
.iv-question {
  width: 100%;
  max-width: 500px;
  text-align: center;
}

.iv-question-label {
  display: block;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--iv-text-light);
  margin-bottom: 1rem;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Options Grid (Choice Mode) */
.iv-options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.option-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--iv-bg-card);
  border: 2px solid transparent;
  border-radius: var(--iv-radius-md);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--iv-transition);
  box-shadow: var(--iv-shadow-sm);
}

.option-btn:hover:not(.correct):not(.wrong) {
  background: rgba(255, 255, 255, 1);
  border-color: var(--iv-primary);
  transform: translateY(-2px);
  box-shadow: var(--iv-shadow-md);
}

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

.iv-option-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--iv-primary);
  color: white;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 700;
}

.iv-option-text {
  font-family: 'Fira Code', monospace;
  color: var(--iv-text);
}

.option-btn.correct {
  background: var(--iv-success);
  border-color: var(--iv-success);
  color: white;
  animation: correctPop 0.3s ease;
}

.option-btn.correct .iv-option-number {
  background: rgba(255, 255, 255, 0.3);
}

.option-btn.correct .iv-option-text {
  color: white;
}

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

.option-btn.wrong {
  background: var(--iv-danger);
  border-color: var(--iv-danger);
  color: white;
  animation: shake 0.4s ease;
}

.option-btn.wrong .iv-option-number {
  background: rgba(255, 255, 255, 0.3);
}

.option-btn.wrong .iv-option-text {
  color: white;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-5px); }
  40%, 80% { transform: translateX(5px); }
}

/* Typing Area */
.iv-typing-area {
  display: flex;
  gap: 0.75rem;
  width: 100%;
}

.iv-typing-input {
  flex: 1;
  padding: 1rem 1.25rem;
  font-size: 1.25rem;
  font-family: 'Fira Code', monospace;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--iv-radius-md);
  background: var(--iv-bg-card);
  color: var(--iv-text);
  outline: none;
  transition: var(--iv-transition);
}

.iv-typing-input:focus {
  border-color: var(--iv-primary);
  box-shadow: var(--iv-shadow-glow);
}

.iv-typing-input.correct {
  border-color: var(--iv-success);
  background: rgba(34, 197, 94, 0.1);
}

.iv-typing-input.wrong {
  border-color: var(--iv-danger);
  background: rgba(239, 68, 68, 0.1);
  animation: shake 0.4s ease;
}

.iv-correct-answer {
  margin-top: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(239, 68, 68, 0.1);
  border-left: 3px solid var(--iv-danger);
  border-radius: var(--iv-radius-sm);
  color: var(--iv-text-light);
  font-size: 0.95rem;
}

.iv-correct-answer strong {
  font-family: 'Fira Code', monospace;
  color: var(--iv-success);
}

/* Pattern Hint */
.iv-pattern-hint {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--iv-bg-glass);
  border-radius: var(--iv-radius-md);
  backdrop-filter: blur(10px);
  max-width: 500px;
}

.iv-hint-icon {
  font-size: 1.25rem;
}

.iv-hint-text {
  font-size: 0.9rem;
  color: var(--iv-text-light);
  opacity: 0.9;
}

/* Game Footer */
.iv-game-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  margin-top: auto;
}

.iv-level-indicator {
  font-weight: 600;
  color: var(--iv-text-light);
  opacity: 0.8;
}

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

.iv-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--iv-radius-md);
  cursor: pointer;
  transition: var(--iv-transition);
}

.iv-btn-primary {
  background: var(--iv-primary);
  color: white;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.iv-btn-primary:hover {
  background: var(--iv-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

.iv-btn-secondary {
  background: var(--iv-bg-glass);
  color: var(--iv-text-light);
  border: 2px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.iv-btn-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: var(--iv-text-light);
}

/* ============================================
   RESULTS SCREEN
   ============================================ */

.iv-results {
  max-width: 600px;
  margin: 2rem auto;
  padding: 2rem;
  background: var(--iv-bg-card);
  border-radius: var(--iv-radius-xl);
  box-shadow: var(--iv-shadow-lg);
  text-align: center;
}

.iv-results-header h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--iv-text);
}

.iv-stars {
  font-size: 3rem;
  margin-bottom: 1.5rem;
}

.iv-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.iv-stat-item {
  padding: 1rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
  border-radius: var(--iv-radius-md);
}

.iv-stat-value {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--iv-primary);
  margin-bottom: 0.25rem;
}

.iv-stat-label {
  font-size: 0.85rem;
  color: var(--iv-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Mistakes Section */
.iv-mistakes-section {
  margin-bottom: 2rem;
  text-align: left;
}

.iv-mistakes-section h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--iv-text);
}

.iv-mistakes-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.iv-mistake-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: rgba(239, 68, 68, 0.05);
  border-radius: var(--iv-radius-sm);
  font-family: 'Fira Code', monospace;
  font-size: 0.9rem;
}

.iv-mistake-verb {
  font-weight: 600;
  color: var(--iv-text);
}

.iv-mistake-arrow {
  color: var(--iv-text-muted);
}

.iv-mistake-wrong {
  color: var(--iv-danger);
  text-decoration: line-through;
}

.iv-mistake-correct {
  color: var(--iv-success);
  font-weight: 600;
}

/* Results Actions */
.iv-results-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.iv-retry-btn, .iv-menu-btn {
  min-width: 150px;
}

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

@media (max-width: 768px) {
  .iv-sections-grid {
    grid-template-columns: 1fr;
  }
  
  .iv-options-grid {
    grid-template-columns: 1fr;
  }
  
  .iv-game-header {
    flex-direction: column;
    text-align: center;
  }
  
  .iv-verb-card {
    padding: 2rem 1.5rem;
  }
  
  .iv-typing-area {
    flex-direction: column;
  }
  
  .iv-stats-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .iv-mode-selector {
    flex-direction: column;
    align-items: stretch;
  }
  
  .iv-mode-option {
    flex-direction: row;
    gap: 1rem;
  }
  
  .iv-section-card {
    padding: 1rem;
  }
  
  .iv-section-emoji {
    font-size: 2rem;
  }
  
  .iv-verb-v1 {
    font-size: 2rem;
  }
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

.iv-menu,
.iv-game,
.iv-results {
  animation: fadeIn 0.3s ease;
}

@keyframes heartBeat {
  0% { transform: scale(1); }
  14% { transform: scale(1.3); }
  28% { transform: scale(1); }
  42% { transform: scale(1.3); }
  70% { transform: scale(1); }
}

.iv-heart.lost {
  animation: heartBeat 0.5s ease;
}

/* ============================================
   PRONUNCIATION SCREEN
   ============================================ */

.iv-pronunciation {
  max-width: 600px;
  margin: 2rem auto;
  padding: 2rem;
  animation: fadeIn 0.3s ease;
}

.iv-pronunciation-header {
  text-align: center;
  margin-bottom: 2rem;
}

.iv-pronunciation-header h2 {
  font-size: 2rem;
  color: var(--iv-text-light);
  margin-bottom: 0.5rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.iv-pronunciation-subtitle {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.8);
}

.iv-pronunciation-card {
  background: var(--iv-bg-card);
  border-radius: var(--iv-radius-xl);
  padding: 2rem;
  box-shadow: var(--iv-shadow-lg);
}

.iv-pronunciation-translation {
  text-align: center;
  font-size: 1.25rem;
  color: var(--iv-text-muted);
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--iv-bg-glass);
}

.iv-pronunciation-forms {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.iv-form-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: rgba(99, 102, 241, 0.05);
  border-radius: var(--iv-radius-md);
  border: 2px solid transparent;
  transition: var(--iv-transition);
}

.iv-form-item.speaking {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--iv-primary);
  transform: scale(1.02);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
}

.iv-form-item.speaking .iv-form-word {
  color: var(--iv-primary);
  animation: speakingPulse 0.5s ease infinite;
}

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

.iv-form-item.spoken {
  background: rgba(34, 197, 94, 0.1);
  border-color: var(--iv-success);
}

.iv-form-item.spoken .iv-form-word {
  color: var(--iv-success);
}

.iv-form-item.spoken::after {
  content: '✓';
  margin-left: auto;
  color: var(--iv-success);
  font-size: 1.25rem;
}

.iv-form-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--iv-text-muted);
  letter-spacing: 0.05em;
  min-width: 100px;
}

.iv-form-word {
  font-family: 'Fira Code', monospace;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--iv-text);
  transition: var(--iv-transition);
}

.iv-form-transcription {
  font-family: 'Fira Code', monospace;
  font-size: 0.9rem;
  color: var(--iv-text-muted);
  margin-left: auto;
}

.iv-pronunciation-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--iv-bg-glass);
  border-radius: var(--iv-radius-md);
}

.iv-status-icon {
  font-size: 1.5rem;
  animation: soundWave 1s ease infinite;
}

@keyframes soundWave {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.2); opacity: 0.7; }
}

.iv-status-text {
  font-weight: 600;
  color: var(--iv-text);
}

.iv-pronunciation-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.iv-skip-btn,
.iv-repeat-btn {
  min-width: 140px;
}

.iv-repeat-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Responsive pronunciation */
@media (max-width: 768px) {
  .iv-form-item {
    flex-wrap: wrap;
  }
  
  .iv-form-label {
    width: 100%;
    margin-bottom: 0.25rem;
  }
  
  .iv-form-word {
    font-size: 1.25rem;
  }
  
  .iv-form-transcription {
    width: 100%;
    margin-left: 0;
    margin-top: 0.25rem;
  }
}

/* ============================================
   PRINT
   ============================================ */

@media print {
  .iv-container {
    background: white;
    color: black;
  }
  
  .iv-btn {
    display: none;
  }
}