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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 900px;
  margin: 0 auto;
}

header {
  text-align: center;
  color: white;
  margin-bottom: 30px;
  padding: 20px 0;
}

header h1 {
  font-size: 2rem;
  margin-bottom: 10px;
}

header p {
  opacity: 0.9;
}

main {
  background: white;
  border-radius: 16px;
  padding: 30px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

/* 上传区域 */
.upload-section {
  margin-bottom: 30px;
}

.drop-zone {
  border: 3px dashed #ddd;
  border-radius: 12px;
  padding: 40px 20px;
  text-align: center;
  transition: all 0.3s;
  cursor: pointer;
}

.drop-zone:hover {
  border-color: #667eea;
  background: #f8f9ff;
}

.drop-zone.dragover {
  border-color: #667eea;
  background: #f0f4ff;
}

.drop-zone .icon {
  font-size: 3rem;
  margin-bottom: 10px;
}

.drop-zone p {
  color: #666;
  margin-bottom: 5px;
}

.drop-zone .hint {
  font-size: 0.85rem;
  color: #999;
}

.file-info {
  margin-top: 15px;
  padding: 15px;
  background: #f0f4ff;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.btn-remove {
  background: #ff4757;
  color: white;
  border: none;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

/* 配置区域 */
.config-section {
  margin-bottom: 30px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: #333;
}

.radio-group, .checkbox-group {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.radio-group label, .checkbox-group label {
  font-weight: normal;
  cursor: pointer;
}

/* 自定义题量 */
.custom-count-group label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.type-count-input {
  width: 50px;
  padding: 4px 6px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 0.9rem;
}

.total-count-info {
  margin-top: 10px;
  font-size: 0.95rem;
  color: #667eea;
  font-weight: 600;
}

/* 文件比例配置 */
.file-ratio-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 10px;
}

.file-ratio-item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.file-ratio-item label {
  flex: 1;
  font-size: 0.9rem;
  color: #333;
}

.file-ratio-item input {
  width: 80px;
  padding: 4px 6px;
  border: 1px solid #ddd;
  border-radius: 4px;
}

.drop-zone .hint {
  font-size: 0.85rem;
  color: #999;
}

.config-section .hint {
  font-size: 0.85rem;
  color: #999;
  margin-top: 5px;
}

input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #ddd;
  outline: none;
  -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #667eea;
  cursor: pointer;
}

#countValue {
  color: #667eea;
  font-weight: 600;
}

.btn-generate {
  width: 100%;
  padding: 15px;
  font-size: 1.1rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-generate:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-generate:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.loading {
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* 结果区域 */
.result-section {
  border-top: 1px solid #eee;
  padding-top: 20px;
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.result-header h2 {
  font-size: 1.5rem;
  color: #333;
}

.result-actions {
  display: flex;
  gap: 10px;
}

.btn-export {
  padding: 8px 16px;
  background: #f0f4ff;
  color: #667eea;
  border: 1px solid #667eea;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-export:hover {
  background: #667eea;
  color: white;
}

.btn-toggle-answers {
  padding: 8px 16px;
  background: #2ecc71;
  color: white;
  border: 1px solid #27ae60;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-toggle-answers:hover {
  background: #27ae60;
  transform: translateY(-1px);
}

.btn-toggle-answers.showing {
  background: #95a5a6;
  border-color: #7f8c8d;
}

.btn-print {
  padding: 8px 16px;
  background: #34495e;
  color: white;
  border: 1px solid #2c3e50;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-print:hover {
  background: #2c3e50;
  transform: translateY(-1px);
}

.btn-view-results {
  padding: 8px 16px;
  background: #9b59b6;
  color: white;
  border: 1px solid #8e44ad;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-view-results:hover {
  background: #8e44ad;
  transform: translateY(-1px);
}

/* 默认隐藏答案和解析，正确选项不高亮 */
.answer-display,
.explanation {
  display: none !important;
}

.option-item.correct {
  background: white;
  border-left-color: #ddd;
}

/* 显示答案模式 */
body.show-answers .answer-display,
body.show-answers .explanation {
  display: block !important;
}

body.show-answers .option-item.correct {
  background: #f0fff4 !important;
  border-left-color: #2ecc71 !important;
}

.questions-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.question-item {
  padding: 20px;
  background: #f8f9fa;
  border-radius: 10px;
  border-left: 4px solid #667eea;
}

.question-header {
  display: flex;
  gap: 10px;
  align-items: start;
  margin-bottom: 10px;
}

.question-number {
  background: #667eea;
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  flex-shrink: 0;
}

.question-text {
  flex: 1;
  line-height: 1.5;
  font-weight: 500;
}

.type-badge {
  display: inline-block;
  padding: 2px 8px;
  margin-right: 8px;
  background: #667eea;
  color: white;
  font-size: 0.75rem;
  border-radius: 4px;
  font-weight: 600;
}

.options-list {
  margin-top: 10px;
  margin-left: 38px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.option-item {
  padding: 8px 12px;
  background: white;
  border-radius: 6px;
  border-left: 3px solid #ddd;
}

.answer-display {
  margin-top: 10px;
  margin-left: 38px;
  padding: 10px 15px;
  background: #e8fbff;
  border-radius: 6px;
}

.answer-label {
  font-weight: 600;
  color: #2980b9;
}

.explanation {
  margin-top: 8px;
  margin-left: 38px;
  padding: 10px 15px;
  background: #fff8e1;
  border-radius: 6px;
  font-size: 0.9rem;
  color: #e65100;
}

.explanation-label {
  font-weight: 600;
}

/* 错误提示 */
.error-toast {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 15px 20px;
  background: #ff4757;
  color: white;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(255, 71, 87, 0.3);
  animation: slideIn 0.3s ease;
  z-index: 1000;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

footer {
  text-align: center;
  color: white;
  margin-top: 30px;
  opacity: 0.8;
}

/* 括号只在打印时显示 */
.print-answer-paren {
  display: none;
}

/* 打印样式 - 考卷排版 */
@media print {
  body {
    background: white;
    padding: 0;
  }

  header,
  .upload-section,
  .config-section,
  .result-actions,
  .result-header h2,
  footer {
    display: none !important;
  }

  main {
    background: white;
    box-shadow: none;
    padding: 0;
  }

  .container {
    max-width: none;
  }

  .result-section {
    display: block !important;
    padding-top: 0;
    border: none;
  }

  .question-item {
    background: white;
    border-left: none;
    padding: 10px 0;
    page-break-inside: avoid;
  }

  .question-number {
    background: none !important;
    color: black !important;
    border: none !important;
    width: auto !important;
    height: auto !important;
    padding-right: 8px;
  }

  .type-badge {
    display: none !important;
  }

  .print-answer-paren {
    display: inline;
    float: right;
  }

  .answer-display,
  .explanation {
    display: none !important;
  }

  .option-item.correct {
    background: white !important;
    border-left-color: #ddd !important;
  }

  .options-list .option-item {
    border-left: 3px solid #ddd;
  }

  /* 客观题题目后面加括号供填写答案，简答题留空白 */
  .question-item.essay-type {
    margin-bottom: 80px;
  }
}

/* 考试模式样式 */
.exam-mode {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: white;
  z-index: 9999;
  padding: 20px;
  overflow-y: auto;
  display: none;
}

.exam-mode.show {
  display: block;
}

.exam-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 15px;
  border-bottom: 1px solid #eee;
}

.exam-title {
  font-size: 1.3rem;
  font-weight: 600;
}

.exam-close {
  background: #f0f0f0;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
}

.exam-question {
  max-width: 800px;
  margin: 0 auto;
}

.exam-question-number {
  font-size: 1.1rem;
  font-weight: 60;
  margin-bottom: 15px;
}

.exam-question-text {
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.exam-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 30px;
}

.exam-option-item {
  padding: 12px 16px;
  border: 2px solid #ddd;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.exam-option-item:hover {
  border-color: #667eea;
  background: #f0f4ff;
}

.exam-option-item.selected {
  border-color: #667eea;
  background: #f0f4ff;
}

.exam-navigation {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  margin-top: 30px;
}

.exam-nav-btn {
  flex: 1;
  padding: 12px 20px;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
}

.exam-nav-btn:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.exam-submit {
  background: #2ecc71;
}

.exam-result {
  max-width: 800px;
  margin: 30px auto;
  padding: 20px;
  background: #f8f9fa;
  border-radius: 12px;
}

.exam-result-title {
  font-size: 1.5rem;
  font-weight: 60;
  margin-bottom: 15px;
  text-align: center;
}

.exam-result-score {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 20px;
  color: #667eea;
  font-weight: 60;
}

.exam-result-detail {
  margin-top: 20px;
}

.exam-result-item {
  padding: 15px;
  margin-bottom: 10px;
  background: white;
  border-radius: 8px;
  border-left: 4px solid #ccc;
}

.exam-result-item.correct {
  border-left-color: #2ecc71;
}

.exam-result-item.wrong {
  border-left-color: #e74c3c;
}

.exam-result-question {
  font-weight: 60;
  margin-bottom: 8px;
}

.exam-result-answer {
  font-size: 0.9rem;
  color: #666;
}

.btn-start-exam {
  padding: 8px 16px;
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

/* 考试用户信息表单 */
.exam-user-info {
  max-width: 500px;
  margin: 50px auto;
  padding: 30px;
  background: #f8f9fa;
  border-radius: 12px;
}

.exam-user-info-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 25px;
  text-align: center;
  color: #333;
}

.exam-user-form .form-group {
  margin-bottom: 20px;
}

.exam-user-form .form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: #333;
}

.exam-user-form .form-group input {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.exam-user-form .form-group input:focus {
  outline: none;
  border-color: #667eea;
  background: #f0f4ff;
}

.form-actions {
  margin-top: 30px;
  text-align: center;
}

.exam-start-btn {
  padding: 14px 40px;
  font-size: 1.1rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s;
}

.exam-start-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

/* 提交结果消息样式 */
.submit-success-message {
  text-align: center;
  padding: 10px;
  margin-bottom: 15px;
  background: #f0fff4;
  color: #2ecc71;
  border-radius: 8px;
  font-weight: 600;
}

.submit-error-message {
  text-align: center;
  padding: 10px;
  margin-bottom: 15px;
  background: #fff5f5;
  color: #e74c3c;
  border-radius: 8px;
  font-weight: 600;
}

.exam-result-info {
  text-align: center;
  margin-bottom: 20px;
  padding: 15px;
  background: #f0f4ff;
  border-radius: 8px;
}

.exam-result-info p {
  margin: 8px 0;
  font-size: 1rem;
}

.exam-screenshot {
  background: #9b59b6;
}

@media (max-width: 600px) {
  main {
    padding: 20px;
  }
  
  .radio-group {
    gap: 10px;
  }
  
  .result-header {
    flex-direction: column;
    gap: 15px;
  }
}