:root {
  /* Colors - Base */
  --color-bg: #FAF9F7;
  --color-surface: #fff;
  --color-surface-alt: #f0efed;
  
  /* Colors - Text */
  --color-text: #1a1a1a;
  --color-text-secondary: #4a4a4a;
  --color-text-muted: #6b6b6b;
  
  /* Colors - Number palette */
  --color-num-1: #E85D5D;
  --color-num-2: #E8A84C;
  --color-num-3: #4AAFB8;
  --color-num-4: #C473B3;
  --color-num-5: #5BB381;
  --color-num-6: #7B6CD6;
  --color-num-7: #D68B5B;
  --color-num-8: #5B8FD6;
  --color-num-9: #A4896B;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 32px;
  
  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-xl: 14px;
  --radius-2xl: 20px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 6px 20px rgba(0, 0, 0, 0.15);
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-display: 'Solway', serif;
  
  /* Animation */
  --transition-fast: 0.15s ease;
  --transition-bounce: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  
  /* Cell sizing */
  --cell-size: 38px;
  --cell-gap: 6px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-xl) 20px;
  color: var(--color-text);
}

h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  margin-bottom: var(--space-xs);
  font-weight: 700;
  color: var(--color-text);
}

.daily-info {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
}

.stats {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  font-size: 0.9rem;
}

.stat {
  background: var(--color-surface);
  padding: var(--space-lg) var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  color: var(--color-text-secondary);
  min-width: 100px;
  text-align: center;
}

.stat-value {
  font-weight: 600;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.grid-container {
  background: var(--color-surface);
  padding: var(--space-md);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-md);
}

.grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: var(--cell-gap);
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  padding: var(--cell-gap);
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  position: relative;
  color: var(--color-surface);
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.12);
}

.cell:not(.empty):hover {
  transform: scale(1.08);
  z-index: 10;
  box-shadow: var(--shadow-lg);
}

.cell:not(.empty):active {
  transform: scale(0.96);
}

.cell.empty {
  background: var(--color-surface-alt);
  cursor: default;
}

/* Number colors */
.cell[data-value="1"] { background: var(--color-num-1); }
.cell[data-value="2"] { background: var(--color-num-2); }
.cell[data-value="3"] { background: var(--color-num-3); }
.cell[data-value="4"] { background: var(--color-num-4); }
.cell[data-value="5"] { background: var(--color-num-5); }
.cell[data-value="6"] { background: var(--color-num-6); }
.cell[data-value="7"] { background: var(--color-num-7); }
.cell[data-value="8"] { background: var(--color-num-8); }
.cell[data-value="9"] { background: var(--color-num-9); }

.cell.popping {
  animation: pop 0.4s ease-out forwards;
}

.cell.falling {
  transition: transform var(--transition-bounce);
  z-index: 100;
  position: relative;
}

.cell.bump {
  animation: bump 0.2s ease;
}

@keyframes pop {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.8; }
  100% { transform: scale(0); opacity: 0; }
}

@keyframes bump {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

.points-popup {
  position: fixed;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  pointer-events: none;
  animation: floatUp 0.9s ease-out forwards;
  z-index: 1000;
}

@keyframes floatUp {
  0% { transform: translateY(0) scale(1); opacity: 1; }
  100% { transform: translateY(-50px) scale(1.1); opacity: 0; }
}

button {
  background: var(--color-text);
  color: var(--color-surface);
  border: none;
  padding: var(--space-md) 20px;
  border-radius: var(--radius-lg);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

button:hover {
  background: #333;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

button:active {
  transform: translateY(0);
  background: var(--color-text);
}

.game-over {
  position: fixed;
  inset: 0;
  background: rgba(250, 249, 247, 0.95);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.game-over h2 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xl);
  color: var(--color-text);
}

.game-over .final-score {
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
}

.game-over .final-score span {
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.5rem;
}

.cells-cleared {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2xl);
}

.cells-cleared span {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.game-over-buttons {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.share-confirm {
  color: var(--color-num-5);
  font-size: 0.875rem;
  font-weight: 500;
  margin-top: var(--space-sm);
  animation: fadeIn 0.3s ease;
}

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

.hidden {
  display: none !important;
}

.combo-text {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  pointer-events: none;
  z-index: 1000;
  animation: comboFlash 0.8s ease-out forwards;
}

@keyframes comboFlash {
  0% { transform: translate(-50%, -50%) scale(0.5); opacity: 0; }
  30% { transform: translate(-50%, -50%) scale(1.2); opacity: 1; }
  100% { transform: translate(-50%, -50%) scale(1); opacity: 0; }
}

.cascade-1 { color: var(--color-num-3); }
.cascade-2 { color: var(--color-num-2); }
.cascade-3 { color: var(--color-num-1); }
.cascade-4 { color: var(--color-num-6); }

/* Mobile */
@media (max-width: 600px) {
  :root {
    --cell-size: 30px;
    --cell-gap: 4px;
  }
  
  h1 {
    font-size: 1.5rem;
  }

  .daily-info {
    font-size: 0.8rem;
    margin-bottom: 20px;
  }

  .stats {
    gap: var(--space-sm);
    font-size: 0.85rem;
  }

  .stat {
    padding: var(--space-sm) var(--space-md);
  }

  .cell {
    font-size: 0.95rem;
  }

  .grid-container {
    border-radius: var(--radius-xl);
  }

  button {
    padding: 11px 18px;
    font-size: 0.875rem;
  }
}