html, body {
      height: 100%;
      margin: 0;
      background: linear-gradient(120deg, #2b5876, #4e4376 100%);
      display: flex;
      justify-content: center;
      align-items: center;
      color: #fff;
      font-family: 'Segoe UI', Arial, sans-serif;
      user-select: none;
    }
    .game-wrapper {
      background: #252850;
      border-radius: 18px;
      box-shadow: 0 3px 24px #1a145615;
      padding: 22px 28px;
    }
    h1 {
      text-align: center;
      margin-bottom: 0.4em;
      font-size: 2em;
      letter-spacing: 2px;
      font-weight: 700;
    }
    .canvas-container {
      display: flex;
      justify-content: center;
      align-items: center;
      background: #16182d;
      border-radius: 14px;
      margin-bottom: 20px;
      box-shadow: 0 1px 12px #10132e57;
    }
    #gameCanvas {
      background: #222444;
      border-radius: 14px;
      display: block;
    }
    .status-panel {
      display: flex;
      justify-content: space-between;
      margin-bottom: 14px;
      font-size: 1.1em;
    }
    #msg {
      min-height: 2em;
      text-align: center;
      margin-bottom: 12px;
      font-size: 1.25em;
      font-weight: 600;
      color: #ffed65;
    }
    .btn {
      display: inline-block;
      padding: 11px 30px;
      border: none;
      border-radius: 22px;
      background: linear-gradient(90deg, #ff5e62, #ff9966);
      color: white;
      font-weight: 700;
      font-size: 1em;
      cursor: pointer;
      transition: background 0.3s;
      box-shadow: 0 2px 8px #0003;
      margin: 0 auto;
      display: block;
    }
    .btn:hover {
      background: linear-gradient(90deg, #ff9966, #ff5e62);
    }
    @media (max-width: 540px) {
      .game-wrapper {
        padding: 6vw 2vw;
      }
      #gameCanvas {
        width: 84vw !important;
        height: 50vw !important;
      }
    }