* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      touch-action: manipulation;
    }
    
    body {
      margin: 0;
      overflow: hidden;
      background: #1a1a2e;
      color: white;
      -webkit-tap-highlight-color: transparent;
    }

    canvas {
      display: block;
      touch-action: none;
    }

    .overlay {
      position: absolute;
      top: 0; 
      left: 0;
      width: 100%; 
      height: 100%;
      background: linear-gradient(135deg, #1a1a2e, #16213e);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 10;
      text-align: center;
      padding: 20px;
      opacity: 1;
      transition: opacity 0.5s ease;
    }

    .overlay.hidden {
      opacity: 0;
      pointer-events: none;
    }

    .title {
      font-size: 3.5rem;
      margin-bottom: 20px;
      color: #0fcc45;
      text-shadow: 0 0 10px rgba(15, 204, 69, 0.7);
      letter-spacing: 2px;
    }

    .subtitle {
      font-size: 1.5rem;
      margin-bottom: 40px;
      color: #e6e6e6;
      max-width: 500px;
    }

    .instructions {
      background: rgba(255, 255, 255, 0.1);
      border-radius: 15px;
      padding: 25px;
      margin: 20px 0;
      max-width: 500px;
      text-align: left;
    }

    .instructions h3 {
      color: #4ecca3;
      margin-bottom: 15px;
      font-size: 1.4rem;
    }

    .instructions ul {
      list-style-type: none;
      padding-left: 20px;
    }

    .instructions li {
      margin: 12px 0;
      display: flex;
      align-items: flex-start;
    }

    .instructions li::before {
      content: "•";
      color: #0fcc45;
      font-weight: bold;
      display: inline-block;
      width: 20px;
      font-size: 1.5rem;
    }

    .start-btn {
      background: linear-gradient(to right, #0fcc45, #4ecca3);
      color: white;
      border: none;
      padding: 15px 50px;
      font-size: 1.4rem;
      border-radius: 50px;
      cursor: pointer;
      margin-top: 20px;
      box-shadow: 0 5px 15px rgba(15, 204, 69, 0.4);
      transition: all 0.3s ease;
      font-weight: bold;
    }

    .start-btn:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 20px rgba(15, 204, 69, 0.6);
    }

    #rotateNotice {
      position: absolute;
      top: 0; 
      left: 0;
      width: 100%; 
      height: 100%;
      background: linear-gradient(135deg, #16213e, #0f3460);
      display: none;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: 20px;
      z-index: 20;
      font-size: calc(16px + 2vw);
      line-height: 1.5;
    }

    .rotate-icon {
      font-size: 5rem;
      margin-bottom: 30px;
      animation: rotate 2s infinite linear;
      color: #0fcc45;
    }

    @keyframes rotate {
      from { transform: rotate(0deg); }
      to { transform: rotate(90deg); }
    }

    .game-stats {
      position: absolute;
      top: 20px;
      left: 20px;
      z-index: 5;
      pointer-events: none;
    }

    .stat {
      font-size: 1.2rem;
      margin-bottom: 10px;
      background: rgba(0, 0, 0, 0.5);
      padding: 8px 15px;
      border-radius: 10px;
      display: inline-block;
    }

    .credit {
      position: absolute;
      bottom: 20px;
      right: 20px;
      font-size: 1rem;
      color: rgba(255, 255, 255, 0.7);
      background: rgba(0, 0, 0, 0.3);
      padding: 5px 10px;
      border-radius: 5px;
      pointer-events: none;
    }

    .controls {
      position: absolute;
      bottom: 20px;
      left: 0;
      width: 100%;
      display: flex;
      justify-content: center;
      gap: 20px;
      z-index: 5;
    }

    .control-btn {
      width: 70px;
      height: 70px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.2);
      border: 3px solid rgba(255, 255, 255, 0.5);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: white;
      cursor: pointer;
      user-select: none;
    }

    .jump-btn {
      background: rgba(15, 204, 69, 0.3);
    }

    .volume-control {
      position: absolute;
      top: 20px;
      right: 20px;
      z-index: 5;
      background: rgba(0, 0, 0, 0.5);
      padding: 5px 10px;
      border-radius: 20px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .volume-btn {
      width: 30px;
      height: 30px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.2);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      color: white;
      cursor: pointer;
    }

    .touch-notice {
      position: absolute;
      bottom: 100px;
      left: 0;
      width: 100%;
      text-align: center;
      font-size: 1.2rem;
      color: rgba(255, 255, 255, 0.7);
      pointer-events: none;
      animation: pulse 1.5s infinite;
    }

    @keyframes pulse {
      0% { opacity: 0.5; }
      50% { opacity: 1; }
      100% { opacity: 0.5; }
    }

    @media (max-width: 768px) {
      .title {
        font-size: 2.5rem;
      }
      
      .subtitle {
        font-size: 1.2rem;
      }
      
      .start-btn {
        padding: 12px 40px;
        font-size: 1.2rem;
      }
      
      .instructions {
        padding: 15px;
      }
      
      .control-btn {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
      }
      
      .touch-notice {
        font-size: 1rem;
        bottom: 80px;
      }
    }