* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: "Poppins", sans-serif;
    background: linear-gradient(135deg, #ff6b6b 0%, #4ecdc4 50%, #ffe66d 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: white;
  }
  
  @keyframes gradientShift {
    0% {
      background-position: 0% 50%;
    }
    50% {
      background-position: 100% 50%;
    }
    100% {
      background-position: 0% 50%;
    }
  }
  
  .container {
    text-align: center;
    position: relative;
  }
  
  h1 {
    font-family: "Fredoka One", cursive;
    font-size: 4rem;
    margin-bottom: 0.5rem;
    text-shadow:
      3px 3px 0px #ff6b6b,
      6px 6px 0px rgba(0, 0, 0, 0.2);
    color: #ffe66d;
    letter-spacing: 2px;
    animation: bounce 2s ease-in-out infinite;
  }
  
  @keyframes bounce {
    0%,
    100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-10px);
    }
  }
  
  .instructions {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
    color: #fff;
  }
  
  .canvas-wrapper {
    position: relative;
    width: 640px;
    height: 480px;
    margin: 0 auto;
    border: 6px solid #fff;
    border-radius: 20px;
    box-shadow:
      0 10px 40px rgba(0, 0, 0, 0.4),
      0 0 0 3px #ff6b6b,
      0 0 20px rgba(255, 107, 107, 0.5);
    overflow: hidden;
    transition: all 0.3s ease;
  }
  
  .canvas-wrapper:hover {
    transform: translateY(-5px);
    box-shadow:
      0 15px 50px rgba(0, 0, 0, 0.5),
      0 0 0 3px #ff6b6b,
      0 0 30px rgba(255, 107, 107, 0.7);
  }
  
  #webcam {
    display: none;
  }
  
  #gameCanvas {
    display: block;
    background: #000;
    border-radius: 14px;
  }
  
  #scoreDisplay {
    margin-top: 1.5rem;
    font-size: 2rem;
    font-weight: 700;
    font-family: "Fredoka One", cursive;
    color: #ffe66d;
    text-shadow:
      2px 2px 0px #ff6b6b,
      4px 4px 0px rgba(0, 0, 0, 0.2);
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 2rem;
    border-radius: 50px;
    display: inline-block;
    backdrop-filter: blur(10px);
  }
  
  .overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.98);
    padding: 3rem 2rem;
    border-radius: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    z-index: 100;
    backdrop-filter: blur(20px);
    animation: overlayPop 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  }
  
  @keyframes overlayPop {
    0% {
      transform: translate(-50%, -50%) scale(0.8);
      opacity: 0;
    }
    100% {
      transform: translate(-50%, -50%) scale(1);
      opacity: 1;
    }
  }
  
  .overlay.hidden {
    display: none;
  }
  
  .overlay h2 {
    font-family: "Fredoka One", cursive;
    font-size: 2.8rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #ff6b6b, #4ecdc4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
  }
  
  #overlayMessage {
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }
  
  #startButton {
    background: linear-gradient(135deg, #4ecdc4 0%, #44a3d5 100%);
    color: white;
    border: none;
    padding: 1.2rem 3rem;
    font-size: 1.4rem;
    font-family: "Poppins", sans-serif;
    font-weight: 700;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    box-shadow: 0 6px 20px rgba(78, 205, 196, 0.4);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
  }
  
  #startButton::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
      90deg,
      transparent,
      rgba(255, 255, 255, 0.3),
      transparent
    );
    transition: left 0.5s;
  }
  
  #startButton:hover::before {
    left: 100%;
  }
  
  #startButton:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(78, 205, 196, 0.6);
  }
  
  #startButton:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(78, 205, 196, 0.4);
  }
  
  #startButton:disabled {
    background: linear-gradient(135deg, #ccc 0%, #999 100%);
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
    box-shadow: none;
  }
  
  /* Loading overlay */
  .loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 1;
    transition: opacity 0.5s ease;
  }
  
  .loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
  }
  
  .loading-content {
    text-align: center;
    color: white;
  }
  
  .loading-content h2 {
    font-family: "Fredoka One", cursive;
    font-size: 2rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
  }
  
  .loading-content p {
    font-family: "Poppins", sans-serif;
    font-size: 1.1rem;
    opacity: 0.9;
  }
  
  /* Spinner animation */
  .loader {
    width: 60px;
    height: 60px;
    margin: 0 auto;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-top: 5px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
  }
  
  @keyframes spin {
    0% {
      transform: rotate(0deg);
    }
    100% {
      transform: rotate(360deg);
    }
  }