/**
 * Acoustic Memory Game - Professional Styles
 * Modern, responsive, accessible design with animations
 * @version 2.0.0
 */

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

:root {
  /* Colors */
  --primary-color: #4caf50;
  --primary-dark: #388e3c;
  --secondary-color: #2196f3;
  --accent-color: #ff9800;
  --success-color: #8bc34a;
  --warning-color: #ffc107;
  --error-color: #f44336;

  /* Neutrals */
  --bg-color: #f5f7fa;
  --card-bg: #ffffff;
  --text-primary: #2c3e50;
  --text-secondary: #7f8c8d;
  --border-color: #e0e0e0;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  /* Typography */
  --font-primary: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.75rem;
  --font-size-xxl: 2.5rem;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}

body {
  font-family: var(--font-primary);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  overflow-x: hidden;
}

/* ============================================
   SCREEN LAYOUTS
   ============================================ */

.screen {
  width: 100%;
  max-width: 1200px;
  animation: fadeIn var(--transition-slow);
}

.screen.hidden {
  display: none;
}

.container {
  background: var(--card-bg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-lg);
  animation: slideUp var(--transition-slow);
}

/* ============================================
   HEADERS
   ============================================ */

.game-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.game-header h1 {
  font-size: var(--font-size-xxl);
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

/* ============================================
   WELCOME SCREEN
   ============================================ */

.welcome-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.category-section,
.difficulty-section {
  background: var(--bg-color);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
}

.category-section h2,
.difficulty-section h2 {
  font-size: var(--font-size-xl);
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.category-select {
  width: 100%;
  padding: var(--spacing-md);
  font-size: var(--font-size-lg);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: white;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.category-select:hover,
.category-select:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

.category-preview {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background: white;
  border-radius: var(--radius-md);
  text-align: center;
}

.category-preview h4 {
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.sound-icons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
}

.sound-icon {
  font-size: 2rem;
  padding: var(--spacing-sm);
  background: var(--bg-color);
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast);
}

.sound-icon:hover {
  transform: scale(1.2);
}

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

.difficulty-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.difficulty-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md);
  background: white;
  border: 3px solid var(--border-color);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-primary);
}

.difficulty-btn:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--primary-color);
}

.difficulty-btn.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
  transform: scale(1.05);
}

.difficulty-icon {
  font-size: 3rem;
}

.difficulty-label {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.difficulty-desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.difficulty-btn.active .difficulty-desc {
  color: rgba(255, 255, 255, 0.9);
}

.difficulty-info {
  padding: var(--spacing-md);
  background: white;
  border-radius: var(--radius-md);
  text-align: center;
}

.difficulty-info p {
  margin: var(--spacing-xs) 0;
  color: var(--text-secondary);
}

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

.btn {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-md);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
}

.btn-primary {
  background: var(--primary-color);
  color: white;
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: var(--secondary-color);
  color: white;
}

.btn-secondary:hover {
  background: #1976d2;
  transform: translateY(-2px);
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
  width: 100%;
  margin-top: var(--spacing-md);
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ============================================
   LOADING SCREEN
   ============================================ */

.loading-content {
  text-align: center;
  padding: var(--spacing-xl);
}

.loading-content h2 {
  font-size: var(--font-size-xxl);
  color: var(--primary-color);
  margin-bottom: var(--spacing-lg);
}

.progress-bar {
  width: 100%;
  height: 40px;
  background: var(--bg-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--spacing-md);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--primary-color),
    var(--success-color)
  );
  border-radius: var(--radius-lg);
  transition: width var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
}

.loading-text {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* Sound Wave Animation */
.sound-wave {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  height: 80px;
}

.wave-bar {
  width: 8px;
  background: var(--primary-color);
  border-radius: var(--radius-sm);
  animation: wave 1s ease-in-out infinite;
}

.wave-bar:nth-child(1) {
  animation-delay: 0s;
}
.wave-bar:nth-child(2) {
  animation-delay: 0.1s;
}
.wave-bar:nth-child(3) {
  animation-delay: 0.2s;
}
.wave-bar:nth-child(4) {
  animation-delay: 0.3s;
}
.wave-bar:nth-child(5) {
  animation-delay: 0.4s;
}

@keyframes wave {
  0%,
  100% {
    height: 20px;
    opacity: 0.5;
  }
  50% {
    height: 60px;
    opacity: 1;
  }
}

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

#game-screen .game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--border-color);
}

.game-stats {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

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

.stat-value {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--primary-color);
}

#timer.warning {
  color: var(--error-color);
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ============================================
   SOUND GRID
   ============================================ */

.sound-grid {
  display: grid;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  perspective: 1000px;
}

.sound-card {
  aspect-ratio: 1;
  cursor: pointer;
  position: relative;
  transition: transform var(--transition-fast);
}

.sound-card:hover:not(.matched) {
  transform: scale(1.05);
}

.card-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform var(--transition-normal);
}

.sound-card.revealed .card-inner,
.sound-card.matched .card-inner {
  transform: rotateY(180deg);
}

.card-front,
.card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: var(--spacing-md);
}

.card-front {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--success-color)
  );
  color: white;
}

.card-front .sound-icon {
  font-size: 3rem;
  animation: soundPulse 2s ease-in-out infinite;
}

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

.card-back {
  background: white;
  transform: rotateY(180deg);
  border: 3px solid var(--primary-color);
}

.card-back .sound-icon {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-sm);
}

.sound-name {
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
}

/* Playing Animation */
.sound-card.playing .card-front,
.sound-card.playing .card-back {
  animation: soundWave 0.5s ease-out;
}

@keyframes soundWave {
  0%,
  100% {
    box-shadow: var(--shadow);
  }
  50% {
    box-shadow: 0 0 30px rgba(76, 175, 80, 0.6);
  }
}

/* Matched Animation */
.sound-card.matched {
  animation: matchSuccess 0.6s ease-out;
}

@keyframes matchSuccess {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1) rotate(5deg);
  }
  100% {
    transform: scale(1) rotate(0deg);
  }
}

.sound-card.matched .card-back {
  background: linear-gradient(
    135deg,
    var(--success-color),
    var(--primary-color)
  );
  color: white;
  border-color: var(--success-color);
}

.sound-card.matched .sound-name {
  color: white;
}

/* Mismatch Animation */
.sound-card.mismatch .card-inner {
  animation: shake 0.4s ease-out;
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0) rotateY(180deg);
  }
  25% {
    transform: translateX(-10px) rotateY(180deg);
  }
  75% {
    transform: translateX(10px) rotateY(180deg);
  }
}

.game-footer {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 2px solid var(--border-color);
}

.game-hint {
  font-size: var(--font-size-md);
  color: var(--text-secondary);
}

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

.results-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.results-header h1 {
  font-size: var(--font-size-xxl);
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
  animation: celebration 1s ease-out;
}

@keyframes celebration {
  0% {
    transform: scale(0.5) rotate(-10deg);
    opacity: 0;
  }
  50% {
    transform: scale(1.1) rotate(5deg);
  }
  100% {
    transform: scale(1) rotate(0deg);
    opacity: 1;
  }
}

.results-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
}

.results-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.stats-summary h2,
.badges-section h2 {
  font-size: var(--font-size-xl);
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  background: var(--bg-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: transform var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-4px);
}

.stat-card .stat-icon {
  font-size: 3rem;
}

.stat-card .stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.stat-card .stat-value {
  font-size: var(--font-size-xxl);
  font-weight: 700;
  color: var(--primary-color);
}

/* Badges */
.badges-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
  padding: var(--spacing-md);
  background: var(--bg-color);
  border-radius: var(--radius-lg);
}

.badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md);
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  min-width: 100px;
  animation: badgeAppear 0.5s ease-out backwards;
}

.badge:nth-child(1) {
  animation-delay: 0.1s;
}
.badge:nth-child(2) {
  animation-delay: 0.2s;
}
.badge:nth-child(3) {
  animation-delay: 0.3s;
}
.badge:nth-child(4) {
  animation-delay: 0.4s;
}

@keyframes badgeAppear {
  0% {
    transform: scale(0) rotate(-180deg);
    opacity: 0;
  }
  100% {
    transform: scale(1) rotate(0deg);
    opacity: 1;
  }
}

.badge-icon {
  font-size: 3rem;
}

.badge-name {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
}

/* Skills Progress */
.skills-progress {
  padding: var(--spacing-md);
  background: var(--bg-color);
  border-radius: var(--radius-lg);
}

.skills-progress h4 {
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.skill-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.skill-name {
  flex-shrink: 0;
  width: 200px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.skill-bar {
  flex-grow: 1;
  height: 20px;
  background: white;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.skill-progress {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--primary-color),
    var(--success-color)
  );
  border-radius: var(--radius-md);
  transition: width var(--transition-slow);
}

.skill-count {
  flex-shrink: 0;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 40px;
  text-align: right;
}

.results-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

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

@media (max-width: 768px) {
  .container {
    padding: var(--spacing-md);
  }

  .game-header h1,
  .results-header h1 {
    font-size: var(--font-size-xl);
  }

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

  .game-stats {
    gap: var(--spacing-sm);
  }

  .stat-item {
    flex-direction: row;
    gap: var(--spacing-xs);
  }

  .stat-value {
    font-size: var(--font-size-lg);
  }

  .sound-grid {
    gap: var(--spacing-sm);
  }

  .card-back .sound-icon {
    font-size: 2.5rem;
  }

  .sound-name {
    font-size: var(--font-size-sm);
  }

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

  .skill-name {
    width: 150px;
  }

  .results-actions {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  body {
    padding: var(--spacing-sm);
  }

  .container {
    padding: var(--spacing-sm);
  }

  .sound-icon {
    font-size: 1.5rem;
  }

  .difficulty-icon {
    font-size: 2rem;
  }

  .skill-name {
    width: 100px;
    font-size: 0.75rem;
  }
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

.btn:focus,
.difficulty-btn:focus,
.category-select:focus,
.sound-card:focus {
  outline: 3px solid var(--primary-color);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --border-color: #000000;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  }

  .btn,
  .difficulty-btn,
  .sound-card {
    border: 2px solid currentColor;
  }
}