.quiz-box {
  width: 100%;
  max-width: 500px;
  aspect-ratio: 500 / 330;    
  overflow: hidden;
  position: relative;    
  border: 2px solid #333;

  
  margin: 0 auto;
  
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  
}


.quiz-image {
  width: 100%;
  height: 100%;
  object-fit: cover;     
  filter: blur(22px);    /* initial blur */
  transition: filter 0.5s ease;  /* smooth change of blur */
  
  /* stop user interaction */
  pointer-events: none;
  cursor: not-allowed;
}




.reveal-btn {
  width: 85px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 12px auto 0;
  padding: 0;
  border: none;
  border-radius: 12px;
  background-color: var(--primary-color);
  background-image: url('https://vocabplay.com/wp-content/uploads/game-assets/bottom-panel-icons/reveal-word-white.svg');
  background-repeat: no-repeat;
  background-position: center;
  background-size: 35%;
  color: transparent;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  box-shadow: 0 6px 16px rgba(10, 79, 163, 0.25);
  transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease;
  overflow: hidden;
}


.reveal-btn:active {
  transform: translateY(1px) scale(0.97);
  box-shadow: 0 4px 10px rgba(10, 79, 163, 0.2);
}

.reveal-btn:focus-visible {
  outline: 3px solid var(--asset-color);
  outline-offset: 3px;
}