body {
      font-family: sans-serif;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      background-color: rgb(34, 33, 33);
    }
    .container {
      text-align: center;
      background: rgb(247, 250, 207);
      padding: 2rem;
      border-radius: 1rem;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    }
    .board {
      display: grid;
      grid-template-columns: repeat(3, 80px);
      gap: 0.5rem;
      margin: 1rem 0;
    }
    .square {
      width: 80px;
      height: 80px;
      font-size: 2rem;
      font-weight: bold;
      display: flex;
      justify-content: center;
      align-items: center;
      border: 2px solid #ccc;
      cursor: pointer;
      background-color: #f9fafb;
    }
    .status {
      margin: 1rem 0;
      font-size: 1.25rem;
    }
    button {
      padding: 0.5rem 1rem;
      font-size: 1rem;
      border: none;
      background-color: #f53601;
      color: white;
      border-radius: 0.5rem;
      cursor: pointer;
    }
    .back-btn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #333;
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.2s;
}
.back-btn:hover { background: #555; }