body {
  background: radial-gradient(circle at center, #1e1e1e, #0f0f0f);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

#game-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.8);
  border-radius: 12px;
  box-shadow: 0 0 30px rgba(255, 140, 0, 0.4);
}

h1 {
  font-size: 2.5rem;
  color: #f28b30;
  text-shadow: 0 0 10px rgba(255, 140, 0, 0.7);
  margin-bottom: 20px;
  font-weight: 700;
}

#chessboard {
  display: grid;
  grid-template-columns: repeat(8, 60px);
  grid-template-rows: repeat(8, 60px);
  border: 3px solid #333;
  box-shadow: 0 0 15px rgba(255, 140, 0, 0.3);
}

.square {
  width: 60px;
  height: 60px;
  position: relative;
}

.square.light {
  background-color: #fff5d6;
}

.square.dark {
  background-color: #f28b30;
}

.piece {
  width: 100%;
  height: 100%;
  background-size: 85%;
  background-repeat: no-repeat;
  background-position: center;
  transition: transform 0.15s ease;
  cursor: pointer;
}

.highlight-dot {
  position: absolute;
  width: 14px;
  height: 14px;
  background: rgba(0, 0, 0, 0.4);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}