/* 学习模式样式 - 现代简约主题 */

/* 强制显示页面标题 */
.book-header h1 a {
  color: #333 !important;
  opacity: 1 !important;
}

body .learn-container {
  max-width: 800px !important;
  margin: 0 auto !important;
  padding: 2rem 1rem !important;
  min-height: 600px !important;
  box-sizing: border-box !important;
}

/* 主题切换按钮 */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 100;
  background: #fff;
  border: 2px solid #e5e5e5;
  border-radius: 24px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  font-size: 0.875rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  border-color: #333;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ========== 进度条 ========== */
.progress-wrapper {
  margin-bottom: 2.5rem;
  background: #f9fafb;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: #e5e7eb;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 0.875rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #374151, #1f2937);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 0 8px rgba(31, 41, 55, 0.3);
}

.progress-text {
  color: #6b7280;
  font-size: 0.875rem;
  text-align: center;
  font-weight: 500;
}

/* ========== 模块视图 ========== */
.module-view {
  opacity: 0;
  animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

body .module-header {
  border-left: 6px solid #1f2937;
  background: linear-gradient(90deg, rgba(31, 41, 55, 0.05), transparent);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
  transition: all 0.3s ease;
  border-radius: 0 6px 6px 0;
}

.module-title-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.module-title {
  font-size: 1.625rem;
  font-weight: 700;
  color: #111827;
  margin: 0;
  letter-spacing: 0.02em;
}

.module-indicator {
  color: #374151;
  font-size: 0.875rem;
  font-weight: 600;
  background: #f3f4f6;
  padding: 0.375rem 0.875rem;
  border-radius: 14px;
  border: 1.5px solid #d1d5db;
}

body .module-content {
  background: #ffffff;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  padding: 3rem;
  margin-bottom: 2rem;
  line-height: 2;
  color: #1f2937;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.module-content p {
  margin-bottom: 1.5rem;
}

.module-content p:last-child {
  margin-bottom: 0;
}

.module-actions {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
}

/* ========== 按钮样式 ========== */
body .btn {
  padding: 0.875rem 1.75rem;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  font-weight: 600;
  letter-spacing: 0.01em;
}

body .btn-primary {
  background: #1f2937;
  color: #fff;
  border: 2px solid #1f2937;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
  background: #111827;
  border-color: #111827;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

body .btn-outline {
  background: #fff;
  color: #374151;
  border: 2px solid #d1d5db;
}

.btn-outline:hover {
  border-color: #6b7280;
  background: #f9fafb;
  transform: translateY(-2px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ========== 大纲弹窗 ========== */
.summary-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  display: none !important;
}

.summary-overlay.show {
  display: flex !important;
}

.summary-card {
  background: #ffffff;
  border: 2px solid #e5e7eb;
  border-radius: 12px;
  max-width: 600px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  padding: 1rem;
}

.summary-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 2px solid #e5e7eb;
}

.summary-header h3 {
  margin: 0;
  font-size: 1.25rem;
  color: #111827;
  font-weight: 700;
}

.btn-close {
  background: transparent;
  border: none;
  color: #6b7280;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.btn-close:hover {
  background: #f3f4f6;
  color: #111827;
}

.summary-body {
  padding: 1.5rem;
  color: #374151;
}

.summary-body ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.summary-body li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.summary-body li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: #1f2937;
  font-weight: bold;
}

.summary-takeaway {
  background: #f9fafb;
  border-left: 4px solid #1f2937;
  border-radius: 4px;
  padding: 1rem;
  margin-top: 1rem;
}

.summary-takeaway strong {
  color: #111827;
  display: block;
  margin-bottom: 0.5rem;
}

.summary-takeaway p {
  color: #374151;
  margin: 0;
  line-height: 1.6;
}

/* ========== 测试视图 ========== */
.quiz-view {
  max-width: 700px;
  margin: 0 auto;
}

.quiz-view.hidden {
  display: none;
}

.quiz-header {
  text-align: center;
  margin-bottom: 3rem;
}

.quiz-header h2 {
  font-size: 2rem;
  margin: 0 0 0.5rem 0;
  color: #111827;
}

.quiz-subtitle {
  color: #6b7280;
  font-size: 1rem;
  margin: 0;
}

.quiz-progress {
  text-align: center;
  margin-bottom: 2rem;
  color: #6b7280;
  font-size: 0.875rem;
  font-weight: 500;
}

.quiz-question-card {
  background: #ffffff;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  padding: 2rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.quiz-question {
  font-size: 1.25rem;
  font-weight: 600;
  color: #111827;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.quiz-options {
  margin-bottom: 2rem;
}

.quiz-option {
  background: #f9fafb;
  border: 2px solid #e5e7eb;
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
}

.quiz-option:hover:not(.disabled) {
  border-color: #9ca3af;
  background: #f3f4f6;
}

.quiz-option.selected {
  border-color: #1f2937;
  background: #f3f4f6;
}

.quiz-option.disabled {
  cursor: not-allowed;
}

.quiz-option.correct {
  border-color: #22c55e;
  background: rgba(34, 197, 94, 0.1);
}

.quiz-option.wrong {
  border-color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
}

.quiz-option input[type="radio"] {
  margin-right: 0.75rem;
  accent-color: #1f2937;
}

.quiz-option label {
  color: #374151;
  cursor: pointer;
  flex: 1;
  line-height: 1.6;
}

.quiz-option.disabled label {
  cursor: not-allowed;
}

.quiz-feedback {
  background: #f9fafb;
  border-radius: 6px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  display: flex;
  gap: 1rem;
}

.quiz-feedback.correct {
  border: 2px solid #22c55e;
  background: #f0fdf4;
}

.quiz-feedback.wrong {
  border: 2px solid #ef4444;
  background: #fef2f2;
}

.feedback-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.quiz-feedback.correct .feedback-icon {
  color: #22c55e;
}

.quiz-feedback.wrong .feedback-icon {
  color: #ef4444;
}

.feedback-text strong {
  display: block;
  margin-bottom: 0.5rem;
  color: #111827;
  font-weight: 600;
}

.feedback-text p {
  color: #374151;
  line-height: 1.6;
  margin: 0;
}

.quiz-actions {
  display: flex;
  justify-content: flex-end;
}

/* ========== 完成视图 ========== */
.complete-view {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: 3rem 1rem;
}

.complete-card {
  background: #ffffff;
  border: 2px solid #e5e7eb;
  border-radius: 12px;
  padding: 3rem 2rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.complete-icon {
  width: 80px;
  height: 80px;
  background: #1f2937;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  font-weight: bold;
  margin: 0 auto 2rem;
}

.complete-card h2 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
  color: #111827;
  font-weight: 700;
}

.complete-summary {
  color: #6b7280;
  font-size: 1.125rem;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.complete-stats {
  background: #f9fafb;
  border: 2px solid #e5e7eb;
  border-radius: 6px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.stat-label {
  color: #6b7280;
  font-size: 1rem;
  font-weight: 500;
}

.stat-value {
  color: #111827;
  font-size: 1.5rem;
  font-weight: 700;
}

.complete-actions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.complete-actions .btn {
  width: 100%;
}

/* ========== 模式切换 ========== */
.mode-switcher {
  text-align: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 2px solid #e5e7eb;
}

.switch-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: #6b7280;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.switch-link:hover {
  color: #111827;
}

.switch-link i {
  font-size: 1rem;
}

/* ========== 工具类 ========== */
.hidden {
  display: none !important;
}

/* ========== 暗色主题 ========== */
body.dark-theme {
  background: #0a0a0a;
  color: #e5e5e5;
}

body.dark-theme .book-header h1 a {
  color: #e5e5e5 !important;
}

body.dark-theme .theme-toggle {
  background: #1a1a1a;
  border-color: #404040;
  color: #e5e5e5;
}

body.dark-theme .progress-wrapper {
  background: #000;
  border-color: #262626;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

body.dark-theme .progress-bar {
  background: #1a1a1a;
}

body.dark-theme .progress-fill {
  background: linear-gradient(90deg, #e5e5e5, #fff);
}

body.dark-theme .progress-text {
  color: #a3a3a3;
}

body.dark-theme .module-header {
  border-left-color: #10b981;
  background: linear-gradient(90deg, rgba(38, 38, 38, 1), rgba(26, 26, 26, 0.8));
}

body.dark-theme .module-title {
  color: #fff;
}

body.dark-theme .module-indicator {
  background: #262626;
  border-color: #404040;
  color: #d4d4d4;
}

body.dark-theme .module-content {
  background: #000;
  border-color: #262626;
  color: #e5e5e5;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

body.dark-theme .btn-primary {
  background: #fff;
  color: #000;
  border-color: #fff;
}

body.dark-theme .btn-outline {
  background: #000;
  color: #e5e5e5;
  border-color: #525252;
}

body.dark-theme .btn-outline:hover {
  border-color: #d4d4d4;
  background: #1a1a1a;
}

body.dark-theme .summary-card {
  background: #000;
  border-color: #404040;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
}

body.dark-theme .summary-header {
  border-bottom-color: #262626;
}

body.dark-theme .summary-header h3 {
  color: #fff;
}

body.dark-theme .btn-close {
  color: #a3a3a3;
}

body.dark-theme .btn-close:hover {
  background: #1a1a1a;
  color: #fff;
}

body.dark-theme .summary-body {
  color: #d4d4d4;
}

body.dark-theme .summary-body li::before {
  color: #737373;
}

body.dark-theme .summary-takeaway {
  background: #000;
  border-left-color: #fff;
}

body.dark-theme .summary-takeaway strong {
  color: #fff;
}

body.dark-theme .summary-takeaway p {
  color: #d4d4d4;
}

body.dark-theme .quiz-header h2 {
  color: #fff;
}

body.dark-theme .quiz-subtitle,
body.dark-theme .quiz-progress {
  color: #a3a3a3;
}

body.dark-theme .quiz-question-card {
  background: #000;
  border-color: #262626;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

body.dark-theme .quiz-question {
  color: #fff;
}

body.dark-theme .quiz-option {
  background: #0a0a0a;
  border-color: #262626;
}

body.dark-theme .quiz-option:hover:not(.disabled) {
  border-color: #525252;
  background: #1a1a1a;
}

body.dark-theme .quiz-option.selected {
  border-color: #fff;
  background: #1a1a1a;
}

body.dark-theme .quiz-option label {
  color: #e5e5e5;
}

body.dark-theme .quiz-option input[type="radio"] {
  accent-color: #fff;
}

body.dark-theme .quiz-feedback {
  background: #000;
}

body.dark-theme .feedback-text strong {
  color: #fff;
}

body.dark-theme .feedback-text p {
  color: #d4d4d4;
}

body.dark-theme .complete-card {
  background: #000;
  border-color: #404040;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.6);
}

body.dark-theme .complete-icon {
  background: #fff;
  color: #000;
}

body.dark-theme .complete-card h2 {
  color: #fff;
}

body.dark-theme .complete-summary {
  color: #a3a3a3;
}

body.dark-theme .complete-stats {
  background: #000;
  border-color: #404040;
}

body.dark-theme .stat-label {
  color: #a3a3a3;
}

body.dark-theme .stat-value {
  color: #fff;
}

body.dark-theme .mode-switcher {
  border-top-color: #262626;
}

body.dark-theme .switch-link {
  color: #737373;
}

body.dark-theme .switch-link:hover {
  color: #fff;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .learn-container {
    padding: 1rem;
  }

  .module-content {
    padding: 1.5rem;
  }

  .module-title {
    font-size: 1.25rem;
  }

  .module-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .summary-card {
    margin: 1rem;
  }

  .quiz-question-card {
    padding: 1.5rem;
  }

  .quiz-question {
    font-size: 1.125rem;
  }

  .complete-card {
    padding: 2rem 1.5rem;
  }

  .theme-toggle {
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
  }
}

/* ========== 主题说明 ========== */
/* 本样式已采用黑白主题设计，无需额外 dark mode 处理 */