/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  padding: 20px;
  max-width: 600px;
  margin: 0 auto;
  background-color: #f8f9fa;
}

h1 {
  margin-bottom: 20px;
  color: #333;
  text-align: center;
}

/* Status Message */
.status {
  text-align: center;
  font-size: 1.2em;
  margin-bottom: 15px;
  font-weight: 500;
  color: #333;
}

/* Game Grid */
.game-grid {
  margin: 0 auto 20px;
  border-collapse: collapse;
}

.game-grid td {
  width: 80px;
  height: 80px;
  border: 2px solid #333;
  text-align: center;
  vertical-align: middle;
  font-size: 2em;
  font-weight: bold;
  cursor: pointer;
  text-transform: uppercase;
  transition: background-color 0.2s;
}

.game-grid td:hover {
  background-color: #e9ecef;
}

.cell-x {
  color: #4A90E2;
}

.cell-o {
  color: #dc3545;
}

/* History Buttons */
.history-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 15px;
}

.history-buttons button {
  padding: 8px 16px;
  border: 2px solid #ccc;
  background: white;
  cursor: pointer;
  border-radius: 4px;
  font-size: 14px;
  transition: background-color 0.2s;
}

.history-buttons button:hover {
  background-color: #f5f5f5;
}

.phase-selected {
  border: 4px solid red !important;
}