/* General App Styles */
body {
  font-family: 'Arial', sans-serif;
  background-color: #f0f8ff; /* Light alice blue */
  color: #333;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  padding: 20px;
  box-sizing: border-box;
}

.app-container {
  background-color: #fff;
  padding: 30px;
  border-radius: 20px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  text-align: center;
  width: 100%;
  max-width: 900px; /* Max width adjusted for new layout */
}

.game-header {
  margin-bottom: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 20px;
  border-bottom: 2px solid #e0e0e0;
}

.game-header h1 {
  font-size: 2.5rem; 
  color: #007bff; 
  margin: 0;
}

.display-mode-selector button {
  font-size: 1.3rem; 
  padding: 10px 18px;
  margin: 0 8px;
  border: 2px solid #007bff;
  background-color: #fff;
  color: #007bff;
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.3s, color 0.3s;
}

.display-mode-selector button:hover {
  background-color: #0056b3;
  color: #fff;
}

.display-mode-selector button.active {
  background-color: #007bff;
  color: #fff;
}

.score-display {
  font-size: 1.6rem; 
  font-weight: bold;
  color: #28a745; 
}

/* Game Area Styles */
.game-area {
  padding: 20px;
}

/* New Question Container for 5-column layout */
.question-container-new {
  display: flex;
  justify-content: space-around; /* Distribute columns */
  align-items: flex-start; /* Align tops of columns */
  background-color: #fffacd; /* Light yellow background like image */
  padding: 20px;
  border-radius: 15px;
  margin-bottom: 30px;
  border: 1px solid #ddd; /* Soft border */
}

.operand-column, .result-column {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center; /* Center content like the question mark */
  gap: 15px; 
  flex: 1; 
  padding: 10px;
  min-height: 150px; /* Ensure it has some height to center the ? vertically */
}

.number-box {
  background-color: #fff;
  border: 1px solid #ccc;
  border-radius: 10px;
  padding: 20px 30px;
  min-width: 80px; /* Minimum width for the number box */
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  display: inline-flex; /* To make it wrap content tightly */
  justify-content: center;
  align-items: center;
}

.number-text {
  font-size: 3.5rem; /* Large numbers */
  font-weight: bold;
  color: #333;
}

.objects-display {
  display: flex;
  flex-direction: column; /* Stack objects vertically as in image */
  justify-content: center;
  align-items: center;
  gap: 8px; 
  min-height: 60px; /* Base height even if empty */
  width: 100%; 
}

.item-object {
  font-size: 2.5rem !important; /* Adjusted emoji size */
  padding: 2px;
}

.operator-cell {
  display: flex;
  flex-direction: column; /* To center operator and have line above/below */
  align-items: center;
  justify-content: center; /* Center the operator symbol vertically */
  position: relative; /* For pseudo-elements for lines */
  align-self: stretch; /* Make cell take full height of question-container-new */
  padding: 0 20px; /* Horizontal padding around operator */
}

.operator-cell::before, .operator-cell::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 2px; /* Width of the vertical line */
  background-color: #bdbdbd; /* Color of the vertical line */
  height: calc(50% - 25px); /* Adjust based on operator symbol size and desired gap */
}

.operator-cell::before {
  top: 0;
}

.operator-cell::after {
  bottom: 0;
}

.operator-symbol {
  font-size: 2rem; 
  font-weight: bold;
  color: #555;
  background-color: #fff;
  border: 2px solid #bdbdbd;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1; /* To appear above the pseudo-element lines */
}

.answer-placeholder-new {
  font-size: 4rem; /* Large question mark */
  font-weight: bold;
  color: #dc3545; /* Red color or similar to operand numbers */
  display: flex;
  justify-content: center;
  align-items: center;
  /* If it needs a box like numbers, we can add similar styling to .number-box here */
  /* For now, just a large character */
}

/* Options Styles - Assuming these are still relevant */
.options-container {
  display: flex;
  justify-content: center;
  gap: 20px; 
  margin-bottom: 30px;
}

.option-button {
  font-size: 2.5rem; 
  font-weight: bold;
  padding: 20px 35px;
  border: 3px solid #28a745; 
  background-color: #fff;
  color: #28a745;
  border-radius: 15px;
  cursor: pointer;
  transition: background-color 0.3s, color 0.3s, transform 0.2s;
  min-width: 90px; 
}

.option-button:hover {
  background-color: #218838; 
  color: #fff;
  transform: translateY(-3px); 
}

/* Feedback Message Styles */
.feedback-message {
  font-size: 1.8rem; 
  font-weight: bold;
  margin-top: 25px;
  padding: 15px;
  border-radius: 10px;
  color: #fff;
  /* Assuming JS still sets background color for correct/incorrect, or do it here */
}

.feedback-message:empty {
    display: none;
}

/* Loading State */
.loading {
  font-size: 2rem;
  text-align: center;
  padding: 50px;
  color: #007bff;
}

/* Remove old styles that are no longer used */
/* .question-container, .operand-stack, .operator, .answer-placeholder (and their media queries if specific) */

/* Responsive adjustments for the new layout */
@media (max-width: 768px) {
  .game-header h1 {
    font-size: 2rem;
  }
  .display-mode-selector button {
    font-size: 1.1rem;
    padding: 8px 12px;
  }
  .score-display {
    font-size: 1.3rem;
  }
  .question-container-new {
    flex-direction: column; /* Stack columns vertically on smaller screens */
    align-items: center; /* Center columns when stacked */
    padding: 15px;
  }
  .operand-column, .result-column {
    width: 100%; /* Make columns take full width when stacked */
    max-width: 300px; /* Limit width of operand columns */
    gap: 10px;
  }
  .operator-cell {
    flex-direction: row; /* Operators side by side with lines */
    align-self: auto; /* Reset self-stretch */
    padding: 10px 0;
    width: 80%;
    max-width: 250px;
  }
  .operator-cell::before, .operator-cell::after {
    width: calc(50% - 25px); /* Horizontal lines */
    height: 2px;
    top: 50%;
    transform: translateY(-50%);
  }
  .operator-cell::before {
    left: 0;
  }
  .operator-cell::after {
    right: 0;
    left: auto; /* Override previous left: 50% */
  }
  .number-text {
    font-size: 2.8rem;
  }
  .item-object {
    font-size: 2rem !important;
  }
  .operator-symbol {
    font-size: 1.5rem;
    width: 35px;
    height: 35px;
  }
  .options-container {
    flex-direction: column; 
    gap: 10px;
  }
  .option-button {
    font-size: 2rem;
    padding: 15px 25px;
  }
  .feedback-message {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .game-header {
    flex-direction: column;
    gap: 10px;
  }
  .game-header h1 {
    font-size: 1.6rem;
  }
   .display-mode-selector button {
    font-size: 1rem;
    padding: 6px 10px;
  }
  .number-text {
    font-size: 2.2rem; 
  }
  .item-object {
    font-size: 1.8rem !important;
  }
  .operator-symbol {
    font-size: 1.3rem;
    width: 30px;
    height: 30px;
  }
  .option-button {
    font-size: 1.6rem;
    padding: 12px 20px;
  }
}

/* Clean up old, unused styles - This should be done carefully after verifying */
.question-container, .operand-stack, .operator, .answer-placeholder, .result-objects-display {
    display: none !important; /* Hide them if they are still in the DOM somehow */
}