* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  touch-action: none;
  overscroll-behavior: none;
  user-select: none;
  -webkit-user-select: none;
}

body {
  background: #000;
  overflow: hidden;
  width: 100vw;
  height: 100vh;
  cursor: none;
}

#gameCanvas {
  display: block;
  width: 100vw;
  height: 100vh;
  touch-action: none;
}

#adOverlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #111;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 100;
  color: #fff;
  font-family: 'Courier New', monospace;
}

#adOverlay.hidden {
  display: none;
}

#adOverlay .ad-label {
  font-size: 12px;
  letter-spacing: 4px;
  color: #666;
  margin-bottom: 16px;
  text-transform: uppercase;
}

#adOverlay .ad-box {
  width: 728px;
  max-width: 90vw;
  height: 400px;
  background: #222;
  border: 1px solid #444;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #555;
  font-size: 18px;
  letter-spacing: 2px;
}

#adOverlay .ad-box .ad-placeholder-text {
  font-size: 13px;
  color: #444;
  margin-top: 12px;
  letter-spacing: 1px;
}

#adOverlay .ad-countdown {
  margin-top: 24px;
  font-size: 16px;
  color: #aaa;
  letter-spacing: 2px;
}

#adOverlay .ad-continue-btn {
  margin-top: 20px;
  padding: 12px 40px;
  background: transparent;
  border: 1px solid #fff;
  color: #fff;
  font-family: 'Courier New', monospace;
  font-size: 16px;
  letter-spacing: 4px;
  cursor: pointer;
  display: none;
}

#adOverlay .ad-continue-btn:hover {
  background: #fff;
  color: #000;
}