* { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      background: #090a0f;
      color: #fff;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100vh;
      overflow: hidden;
      touch-action: none;
    }
    #game-container {
      position: relative;
      width: 95vw;
      max-width: 800px;
      max-height: 85vh;
      aspect-ratio: 4 / 3;
      box-shadow: 0 0 30px rgba(0, 243, 255, 0.2);
      border-radius: 12px;
      overflow: hidden;
      border: 2px solid #1a1c29;
    }
    canvas {
      background: #0d0f18;
      display: block;
      width: 100%;
      height: 100%;
    }
    .overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: rgba(13, 15, 24, 0.85);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      backdrop-filter: blur(4px);
      z-index: 10;
      text-align: center;
      padding: 20px;
    }
    .overlay h1 {
      font-size: clamp(24px, 5vw, 38px);
      color: #00f3ff;
      text-shadow: 0 0 15px #00f3ff;
      margin-bottom: 12px;
      letter-spacing: 2px;
    }
    .overlay p {
      font-size: clamp(14px, 3vw, 16px);
      margin-bottom: 24px;
      color: #a0a5c0;
    }
    .btn {
      padding: 12px 32px;
      font-size: 16px;
      font-weight: bold;
      color: #0d0f18;
      background: #ff0055;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      box-shadow: 0 0 15px #ff0055;
      transition: all 0.2s ease;
    }
    .btn:hover {
      transform: scale(1.05);
      box-shadow: 0 0 25px #ff0055;
    }
    .btn-secondary {
      background: transparent;
      color: #a0a5c0;
      border: 1px solid #a0a5c0;
      box-shadow: none;
      margin-top: 10px;
    }
    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.1);
      box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
      color: #fff;
    }
    .hidden { display: none !important; }

    /* High Score Modal Form Styles */
    .score-input {
      width: 100%;
      max-width: 260px;
      padding: 10px 14px;
      font-size: 16px;
      border-radius: 6px;
      border: 2px solid #00f3ff;
      background: #0d0f18;
      color: #fff;
      margin-bottom: 16px;
      outline: none;
      box-shadow: 0 0 10px rgba(0, 243, 255, 0.3);
    }
    .score-input:focus {
      box-shadow: 0 0 18px rgba(0, 243, 255, 0.6);
    }
    #high-score-screen label {
        display: block;
    }

    /* Top Corner Control Buttons */
    .top-controls {
      position: relative;
      top: 5px;
      left: 5px;
      display: flex;
      z-index: 20;
    }
    .icon-btn {
      -webkit-tap-highlight-color: transparent;
      outline: none;
      -webkit-touch-callout: none;
      user-select: none;
      cursor: pointer;
    }