/* Screen Uniformity & Dead Pixel Test Overlay */
.screen-test-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 999999;
  background: #ffffff;
  display: none;
  cursor: pointer;
  user-select: none;
}

.screen-test-overlay.active {
  display: block;
}

.screen-test-hud {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.85);
  color: #ffffff;
  padding: 16px 28px;
  border-radius: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  text-align: center;
  backdrop-filter: blur(16px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  pointer-events: auto;
  transition: opacity 0.4s ease;
  max-width: 90vw;
}

.hud-badge {
  font-size: 16px;
  font-weight: 700;
  color: #00e5ff;
  margin-bottom: 4px;
}

.hud-desc {
  font-size: 13px;
  color: #e0e0e0;
  margin-bottom: 10px;
}

.hud-instructions {
  font-size: 12px;
  color: #a0a0a0;
  margin-bottom: 12px;
}

.key-tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}

.btn-exit-test {
  background: #ff3b30;
  color: #ffffff;
  border: none;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-exit-test:hover {
  background: #d32f2f;
}