:root {
  --bg-color: #000;
  --primary-color: #fff;
  --accent-color: #666;
  --cell-size: 140px;
  --font-family: Arial, sans-serif;
  --x-color: #fff;
  --o-color: #fff;
  --highlight-color: #fff;
  --card-color: #000;
  --losing-color: #888;
  --button-active: #333;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  font-family: var(--font-family);
  color: var(--primary-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden; /* Prevent scrolling */
  position: relative;
}

/* Hide the main title */
header h1 {
  display: none;
}

/* Top left GitHub link */
.top-left {
  position: fixed; /* Changed from absolute to fixed */
  top: 30px;
  left: 30px;
  z-index: 10;
}

.github-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--accent-color);
  transition: all 0.3s ease;
  border-radius: 50%;
  text-decoration: none;
  background-color: transparent;
  border: 1px solid transparent;
}

.github-link:hover {
  color: var(--primary-color);
  background-color: #111;
  border-color: #333;
  transform: scale(1.05);
}

.github-logo {
  transition: transform 0.3s ease;
}

.github-link:hover .github-logo {
  transform: scale(1.1);
}

/* Top right controls */
.controls {
  position: fixed; /* Changed from absolute to fixed */
  top: 30px;
  right: 30px;
  display: flex;
  gap: 15px;
  align-items: center;
  z-index: 10;
}

.mute-btn {
  padding: 10px;
  background-color: transparent;
  color: var(--accent-color);
  border: 1px solid transparent;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
}

.mute-btn:hover {
  background-color: #111;
  color: var(--primary-color);
  border-color: #333;
  transform: scale(1.05);
}

.mute-btn.muted {
  background-color: #222;
  color: #888;
  border-color: #444;
}

.mute-btn.muted:hover {
  background-color: #333;
  color: #aaa;
}

.reset-btn {
  padding: 10px 16px;
  background-color: transparent;
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.reset-btn:hover {
  background-color: var(--primary-color);
  color: var(--bg-color);
  border-color: var(--primary-color);
  transform: translateY(-1px);
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
  margin-top: 60px;
}

#game-board {
  display: grid;
  grid-template-columns: repeat(3, var(--cell-size));
  grid-template-rows: repeat(3, var(--cell-size));
  background-color: var(--primary-color);
  gap: 3px;
}

.cell {
  background-color: var(--bg-color);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 72px;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

/* Custom X and O shapes */
.cell .symbol {
  width: 80px;
  height: 80px;
  position: relative;
  transition: all 0.2s ease;
}

/* O shape - clean circle */
.cell.o .symbol {
  border: 8px solid var(--o-color);
  border-radius: 50%;
  box-sizing: border-box;
}

/* X shape - two diagonal lines */
.cell.x .symbol::before,
.cell.x .symbol::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 8px;
  background-color: var(--x-color);
  top: 50%;
  left: 50%;
  transform-origin: center;
}

.cell.x .symbol::before {
  transform: translate(-50%, -50%) rotate(45deg);
}

.cell.x .symbol::after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.cell:hover {
  background-color: #111;
}

.cell.x {
  color: var(--x-color);
}

.cell.o {
  color: var(--o-color);
}

/* Losing pieces fade to gray */
.cell.losing .symbol {
  transition: all 0.8s ease;
}

.cell.losing.o .symbol {
  border-color: var(--losing-color) !important;
}

.cell.losing.x .symbol::before,
.cell.losing.x .symbol::after {
  background-color: var(--losing-color) !important;
}

/* Winning pieces blink animation - only the symbol blinks */
.cell.winning .symbol {
  animation: winBlink 0.4s ease-in-out 3;
}

@keyframes winBlink {
  0%, 100% { 
    opacity: 1;
  }
  50% { 
    opacity: 0.3;
  }
}

.cell.fade {
  opacity: 0.3;
  transition: opacity 0.5s ease;
}

.scoreboard {
  display: flex;
  gap: 40px;
  justify-content: center;
  flex-wrap: wrap;
  align-items: center;
}

.score {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent-color);
  text-transform: uppercase;
  letter-spacing: 1px;
  min-width: 100px;
  text-align: center;
  transition: all 0.3s ease;
}

.score.active {
  color: var(--primary-color);
}

.score.active .score-number {
  color: var(--primary-color);
  transform: scale(1.1);
}

.score-number {
  font-size: 32px;
  font-weight: 300;
  color: var(--primary-color);
  margin-top: 4px;
  transition: all 0.3s ease;
}

/* Mode toggle in scoreboard */
.mode-toggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.mode-btn {
  padding: 6px 12px;
  background-color: transparent;
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: all 0.2s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  min-width: 32px;
}

.mode-btn.active {
  background-color: var(--primary-color);
  color: var(--bg-color);
  border-color: var(--primary-color);
}

.mode-btn:hover:not(.active) {
  background-color: var(--button-active);
  color: var(--primary-color);
}

.game-status {
  position: absolute;
  top: 120px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 14px;
  font-weight: 500;
  color: var(--accent-color);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  text-align: center;
  z-index: 5;
}

.ai-thinking {
  opacity: 0.7;
  font-style: italic;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .top-left {
    position: static;
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
  }
  
  .controls {
    position: static;
    margin-bottom: 30px;
    justify-content: center;
  }
  
  .game-status {
    position: static;
    margin-bottom: 20px;
    text-align: center;
    transform: none;
    left: auto;
    top: auto;
  }
  
  .container {
    gap: 40px;
  }
  
  .scoreboard {
    gap: 30px;
  }
}