* { margin: 0; padding: 0; box-sizing: border-box; }
  html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #0d1117;
    font-family: system-ui, -apple-system, sans-serif;
    touch-action: none; /* prevent scroll/zoom gestures on mobile */
    -webkit-user-select: none;
    user-select: none;
  }
  #game {
    display: block;
    width: 100%;
    height: 100%;
    cursor: pointer;
  }
  #hint {
    position: fixed;
    left: 50%;
    bottom: 18px;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.45);
    font-size: 14px;
    letter-spacing: 0.04em;
    pointer-events: none;
    transition: opacity 0.6s ease;
    white-space: nowrap;
  }
  #hint.hidden { opacity: 0; }
  #label {
    position: fixed;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.18);
    font-size: 12px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    pointer-events: none;
  }