body {
  background: linear-gradient(135deg, #e0eafc 0%, #cfdef3 100%);
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 400px;
  margin: 40px auto;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  padding: 32px 24px 24px 24px;
  text-align: center;
}

h1 {
  margin-bottom: 24px;
  color: #2d6cdf;
  font-weight: 700;
}

#gameBoard {
  display: grid;
  grid-template-columns: repeat(10, 32px);
  grid-gap: 4px;
  justify-content: center;
  margin-bottom: 20px;
}

.cell {
  width: 32px;
  height: 32px;
  background: #e3eafc;
  border-radius: 6px;
  border: 1px solid #b6c6e3;
  font-size: 18px;
  color: #2d6cdf;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
}

.cell.revealed {
  background: #fff;
  cursor: default;
  color: #333;
}

.cell.mine {
  background: #ff4d4f;
  color: #fff;
}

.cell.flagged {
  background: #ffe58f;
  color: #faad14;
}

#restartBtn {
  background: #2d6cdf;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 8px 24px;
  font-size: 16px;
  cursor: pointer;
  margin-bottom: 12px;
  transition: background 0.2s;
}

#restartBtn:hover {
  background: #1a4fa0;
}

#status {
  font-size: 16px;
  margin-top: 8px;
  color: #faad14;
}