/**
 * Memory Master - Styles
 * Professional memory matching game
 * @version 2.0.0
 */

/* ============================================ */
/* ROOT VARIABLES */
/* ============================================ */

:root {
  /* Colors */
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-primary-light: #60a5fa;

  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #8b5cf6;

  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;

  --color-text-primary: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;

  /* Theme Colors */
  --theme-animals: #10b981;
  --theme-emojis: #f59e0b;
  --theme-colors: #8b5cf6;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* 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);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

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

  /* Z-Index */
  --z-overlay: 1000;
  --z-modal: 1100;
  --z-toast: 1200;
}

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

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  color: var(--color-text-primary);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 0.5rem 1rem;
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
  z-index: var(--z-toast);
}

.skip-link:focus {
  top: 0;
}

/* ============================================ */
/* LAYOUT */
/* ============================================ */

.app-container {
  min-height: 100vh;
  position: relative;
}

.screen {
  display: none;
  min-height: 100vh;
  padding: var(--spacing-lg);
  animation: fadeIn 0.4s ease-out;
}

.screen.active {
  display: flex;
  flex-direction: column;
}

.screen-content {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
}

/* ============================================ */
/* TYPOGRAPHY */
/* ============================================ */

.game-title {
  font-size: 3rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-primary), var(--color-info));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

.game-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
}

.settings-label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.5rem;
  min-height: 44px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  user-select: none;
  white-space: nowrap;
}

.btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

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

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--color-bg);
  color: var(--color-text-primary);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.125rem;
  min-height: 56px;
}

.btn-icon-only {
  aspect-ratio: 1;
  padding: 0.75rem;
  font-size: 1.25rem;
}

.btn-icon {
  font-size: 1.25em;
}

.btn-arrow {
  font-size: 1.5em;
  font-weight: 400;
}

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

.game-header {
  text-align: center;
  padding: var(--spacing-xl) 0;
}

.header-icon {
  font-size: 5rem;
  margin-bottom: var(--spacing-md);
  animation: bounce 2s ease-in-out infinite;
}

.theme-selection {
  flex: 1;
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.theme-card {
  background: var(--color-surface);
  border: 3px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.theme-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--theme-color);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

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

.theme-card:hover::before {
  transform: scaleX(1);
}

.theme-card.selected {
  border-color: var(--theme-color);
  border-width: 3px;
  box-shadow: 0 0 0 4px rgba(var(--theme-color-rgb), 0.1);
}

.theme-card.selected::before {
  transform: scaleX(1);
}

.theme-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  display: block;
}

.theme-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.theme-description {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.theme-count {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-bg);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-weight: 600;
}

.welcome-actions {
  display: flex;
  justify-content: center;
}

/* ============================================ */
/* SETTINGS SCREEN */
/* ============================================ */

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
}

.selected-theme-display {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
  border: 2px solid var(--color-border);
}

.selected-theme-icon {
  font-size: 3rem;
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
}

.selected-theme-info {
  flex: 1;
}

.selected-theme-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.selected-theme-meta {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.settings-group {
  margin-bottom: var(--spacing-2xl);
}

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

.grid-size-btn {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  font-family: inherit;
}

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

.grid-size-btn.selected {
  border-color: var(--color-primary);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(37, 99, 235, 0.05));
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.grid-size-icon {
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mini-grid {
  display: grid;
  gap: 2px;
  width: fit-content;
  margin: 0 auto;
}

.mini-grid.grid-4 {
  grid-template-columns: repeat(4, 8px);
}

.mini-grid.grid-6 {
  grid-template-columns: repeat(6, 6px);
}

.mini-grid.grid-8 {
  grid-template-columns: repeat(8, 5px);
}

.mini-grid div {
  background: var(--color-primary);
  border-radius: 2px;
  aspect-ratio: 1;
}

.grid-size-label {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

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

.difficulty-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--spacing-md);
}

.difficulty-btn {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  font-family: inherit;
}

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

.difficulty-btn.selected {
  border-color: var(--color-primary);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(37, 99, 235, 0.05));
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.difficulty-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.difficulty-label {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

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

.toggle-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
}

.toggle-container:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.toggle-input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
}

.toggle-slider {
  width: 56px;
  height: 32px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  position: relative;
  transition: background var(--transition-base);
  flex-shrink: 0;
}

.toggle-slider::before {
  content: "";
  position: absolute;
  width: 24px;
  height: 24px;
  left: 4px;
  top: 4px;
  background: white;
  border-radius: 50%;
  transition: transform var(--transition-base);
}

.toggle-input:checked + .toggle-slider {
  background: var(--color-primary);
}

.toggle-input:checked + .toggle-slider::before {
  transform: translateX(24px);
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 1;
}

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

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

.toggle-text strong {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.toggle-text small {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.settings-actions {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-xl);
}

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

.game-layout {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  min-height: 100vh;
  padding: var(--spacing-lg);
}

.game-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.game-info-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.theme-badge {
  padding: 0.5rem 1rem;
  background: var(--color-bg);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.game-meta {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.separator {
  color: var(--color-text-muted);
}

.game-info-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

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

.stat-item {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.stat-icon {
  font-size: 1.5rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.stat-content {
  flex: 1;
  min-width: 0;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1;
}

.stat-progress {
  grid-column: span 2;
}

.progress-bar-container {
  position: relative;
  height: 8px;
  background: var(--color-bg);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-success));
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
  width: 0%;
}

.progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.game-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
}

.game-grid {
  display: grid;
  gap: var(--spacing-md);
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  perspective: 1000px;
}

.game-grid.grid-size-4 {
  grid-template-columns: repeat(4, 1fr);
}

.game-grid.grid-size-6 {
  grid-template-columns: repeat(6, 1fr);
}

.game-grid.grid-size-8 {
  grid-template-columns: repeat(8, 1fr);
}

/* ============================================ */
/* MEMORY CARDS (3D FLIP) */
/* ============================================ */

.memory-card {
  aspect-ratio: 1;
  perspective: 1000px;
  cursor: pointer;
  position: relative;
}

.memory-card.disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

.memory-card.flipped .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  box-shadow: var(--shadow-md);
  user-select: none;
}

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

.card-front::after {
  content: "?";
  font-size: 4rem;
  font-weight: 900;
  opacity: 0.3;
}

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

.card-content {
  font-size: 3rem;
  animation: cardReveal 0.3s ease-out;
}

.memory-card.matched {
  animation: matchFound 0.5s ease-out;
}

.memory-card.matched .card-inner {
  opacity: 0.6;
  pointer-events: none;
}

.memory-card.shake {
  animation: shake 0.5s ease-out;
}

/* Card Animations */
@keyframes cardReveal {
  from {
    transform: scale(0.8);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes matchFound {
  0%,
  100% {
    transform: scale(1);
  }
  25% {
    transform: scale(1.05);
  }
  50% {
    transform: scale(0.95);
  }
  75% {
    transform: scale(1.02);
  }
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  10%,
  30%,
  50%,
  70%,
  90% {
    transform: translateX(-10px);
  }
  20%,
  40%,
  60%,
  80% {
    transform: translateX(10px);
  }
}

/* ============================================ */
/* OVERLAYS */
/* ============================================ */

.preview-overlay,
.pause-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-overlay);
  animation: fadeIn 0.3s ease-out;
}

.preview-content,
.pause-content {
  background: var(--color-surface);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  text-align: center;
  max-width: 500px;
  animation: slideUp 0.4s ease-out;
}

.preview-message h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.preview-message p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.preview-countdown {
  font-size: 6rem;
  font-weight: 900;
  color: var(--color-primary);
  animation: pulse 1s infinite;
  line-height: 1;
}

.pause-icon {
  font-size: 5rem;
  margin-bottom: var(--spacing-lg);
}

.pause-content h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-2xl);
}

.pause-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

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

.results-container {
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

.results-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.results-icon {
  font-size: 5rem;
  margin-bottom: var(--spacing-lg);
  animation: bounce 1s ease-in-out;
}

.results-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
}

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

.grade-display {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-2xl);
}

.grade-circle {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-info));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-xl);
  animation: scaleIn 0.5s ease-out;
}

.grade-letter {
  font-size: 4rem;
  font-weight: 900;
  color: white;
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.grade-score {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  opacity: 0.9;
}

.results-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
}

.result-stat {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  animation: slideUp 0.4s ease-out backwards;
}

.result-stat:nth-child(1) {
  animation-delay: 0.1s;
}
.result-stat:nth-child(2) {
  animation-delay: 0.15s;
}
.result-stat:nth-child(3) {
  animation-delay: 0.2s;
}
.result-stat:nth-child(4) {
  animation-delay: 0.25s;
}
.result-stat:nth-child(5) {
  animation-delay: 0.3s;
}
.result-stat:nth-child(6) {
  animation-delay: 0.35s;
}

.result-stat-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.result-stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.result-stat-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 600;
}

.achievements-container {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
  min-height: 80px;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
  justify-content: center;
}

.achievement-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.5rem 1rem;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  animation: bounceIn 0.5s ease-out;
}

.achievement-icon {
  font-size: 1.25rem;
}

.results-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  max-width: 400px;
  margin: 0 auto;
}

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

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

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

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

@keyframes scaleIn {
  from {
    transform: scale(0);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes bounceIn {
  from {
    transform: scale(0.5);
    opacity: 0;
  }
  50% {
    transform: scale(1.05);
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

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

@media (max-width: 768px) {
  .game-title {
    font-size: 2rem;
  }

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

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

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

  .game-grid.grid-size-6 {
    grid-template-columns: repeat(4, 1fr);
  }

  .game-grid.grid-size-8 {
    grid-template-columns: repeat(4, 1fr);
  }

  .card-content {
    font-size: 2rem;
  }

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

  .stat-progress {
    grid-column: span 2;
  }

  .results-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .grade-circle {
    width: 150px;
    height: 150px;
  }

  .grade-letter {
    font-size: 3rem;
  }

  .grade-score {
    font-size: 1.25rem;
  }
}

/* ============================================ */
/* REDUCED MOTION */
/* ============================================ */

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