/* 课程列表页面样式 - Claymorphism 风格 */

/* 教材选择区域 */
.textbook-selector {
  margin-bottom: var(--spacing-xxl);
  background: var(--bg-body); /* 与背景融合 */
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  /* Claymorphism 面板效果 */
  box-shadow: var(--shadow-clay-out);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.textbook-buttons {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

.textbook-btn {
  padding: var(--spacing-md) var(--spacing-xxl);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-secondary);
  background: var(--bg-body);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  min-width: 220px;
  position: relative;
  overflow: hidden;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  /* 默认浮起状态 */
  box-shadow: var(--shadow-clay-out-sm);
}

.textbook-btn::before {
  display: none; /* 移除旧的光效 */
}

.textbook-btn:not(:disabled):hover {
  background: var(--bg-body);
  color: var(--primary-color);
  transform: translateY(-4px);
  box-shadow: var(--shadow-clay-out-hover);
}

.textbook-btn.active {
  background: var(--bg-body);
  color: var(--primary-color);
  /* 激活状态：凹陷效果 */
  box-shadow: var(--shadow-clay-in);
  transform: translateY(2px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.textbook-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
  background: rgba(0,0,0,0.02);
  color: var(--text-disabled);
  transform: none;
}

/* 课程列表区域 */
.lessons-section {
  margin-top: var(--spacing-xxl);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  font-size: 24px;
  font-weight: 800;
  color: var(--text-primary);
  text-shadow: 2px 2px 4px rgba(255, 255, 255, 0.6);
}

.lesson-number {
  text-align: center;
  display: block;
  margin: 0 auto var(--spacing-md);
}

.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 32px; /* 更大的间距 */
  padding: 20px; /* 防止阴影被截断 */
}

/* 课程卡片 - Clay 风格 */
.lesson-card {
  background: var(--bg-body);
  padding: 30px;
  border-radius: var(--radius-xl);
  /* 强烈的浮起效果 */
  box-shadow: var(--shadow-clay-out);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(255, 255, 255, 0.4);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.lesson-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-clay-out-hover);
  z-index: 10;
}

.lesson-card .lesson-number {
  color: white;
  font-size: 13px;
  font-weight: 700;
  background: var(--primary-light);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  width: fit-content;
  box-shadow: inset 2px 2px 4px rgba(0,0,0,0.1); /* 内阴影增加质感 */
  margin-bottom: var(--spacing-md);
}

.lesson-title-en {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.4;
}

.lesson-title-zh {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  font-weight: 500;
}

.lesson-actions {
  margin-top: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.lesson-actions .btn {
  width: 100%;
  font-size: 13px;
  padding: 10px;
  border-radius: 12px; /* 稍微小一点的圆角适应紧凑布局 */
  box-shadow: 4px 4px 8px #D1D9E6, -4px -4px 8px #FFFFFF;
  background-color: white; /* 统一白底 */
  color: var(--primary-color);
}

.lesson-actions .btn:hover {
  transform: translateY(-2px);
  box-shadow: 6px 6px 12px #D1D9E6, -6px -6px 12px #FFFFFF;
  background-color: white;
  color: var(--primary-dark);
}

.lesson-actions .btn:active {
  box-shadow: inset 3px 3px 6px #D1D9E6, inset -3px -3px 6px #FFFFFF;
  transform: translateY(0);
  background-color: #f9f9f9;
}

/* 同样应用于最近学习的按钮 */
.recent-lesson-actions .btn {
  background-color: white;
  color: var(--primary-color);
  box-shadow: var(--shadow-clay-out-sm);
}

.recent-lesson-actions .btn:hover {
  background-color: white;
  color: var(--primary-dark);
  box-shadow: var(--shadow-clay-out-hover);
}

.recent-lesson-actions .btn:active {
  background-color: #f9f9f9;
  box-shadow: var(--shadow-clay-in);
}

/* 课程原文按钮 - 移除特殊样式，使其与其他按钮一致 */
.lesson-actions .btn-text-study {
  /* 移除独占一行和特殊颜色 */
}

.lesson-actions .btn-text-study:hover {
  /* 移除特殊悬停颜色 */
}

/* 最近学习课程 */
.recent-lessons {
  margin-bottom: var(--spacing-xxl);
}

.recent-lesson-card {
  background: var(--bg-body);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-clay-out);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.4);
  transition: all 0.3s ease;
}

.recent-lesson-card:hover {
  box-shadow: var(--shadow-clay-out-hover);
}

.recent-lesson-content {
  padding: 40px;
  display: flex;
  align-items: center;
  gap: 40px;
}

.recent-lesson-number {
  font-size: 28px;
  font-weight: 800;
  color: white;
  background: var(--primary-color);
  padding: 20px 30px;
  border-radius: var(--radius-lg);
  white-space: nowrap;
  box-shadow: 6px 6px 12px rgba(108, 92, 231, 0.3), -6px -6px 12px rgba(255, 255, 255, 0.5);
  text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}

.recent-lesson-title-en {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.recent-lesson-title-zh {
  font-size: 18px;
  color: var(--text-secondary);
  margin: 0;
}

.recent-lesson-actions {
  margin-left: auto;
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.no-recent {
  padding: 60px;
  text-align: center;
  color: var(--text-secondary);
  font-style: italic;
  font-size: 18px;
}

@media (max-width: 768px) {
  .recent-lesson-content {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-lg);
    padding: 30px;
  }
  
  .recent-lesson-actions {
    margin-left: 0;
    width: 100%;
    justify-content: center;
  }
}

/* 模态框样式 - Glassmorphism */
.modal {
  display: none; 
  position: fixed; 
  z-index: 1000; 
  left: 0;
  top: 0;
  width: 100%; 
  height: 100%; 
  overflow: auto; 
  background-color: rgba(209, 217, 230, 0.6); /* 浅色遮罩 */
  backdrop-filter: blur(8px);
  animation: fadeIn 0.3s;
}

.modal-content {
  background-color: var(--bg-body);
  margin: 5% auto; 
  border-radius: var(--radius-xl);
  /* Clay 弹窗 */
  box-shadow: var(--shadow-clay-out-hover);
  border: 1px solid rgba(255, 255, 255, 0.6);
  width: 90%; 
  max-width: 800px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  animation: slideUp 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); /* 弹性弹出 */
}

.modal-header {
  padding: 24px 32px;
  border-bottom: 1px solid rgba(0,0,0,0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255,255,255,0.3);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.modal-header h3 {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
}

.close-btn {
  color: var(--text-disabled);
  font-size: 32px;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.close-btn:hover {
  color: var(--error-color);
  background-color: rgba(255, 118, 117, 0.1);
  transform: rotate(90deg);
}

.modal-body {
  padding: 32px;
  overflow-y: auto;
  line-height: 1.8;
}

/* 句子样式 */
.sentence-item {
  margin-bottom: 20px;
  padding: 20px;
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.sentence-item:hover {
  background-color: rgba(255,255,255,0.5);
  box-shadow: var(--shadow-clay-out-sm);
  transform: scale(1.01);
}

.sentence-en {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  cursor: pointer;
  display: block; /* 改为block以容纳按钮 */
  line-height: 1.5;
  position: relative;
}

.sentence-en:hover {
  color: var(--primary-color);
}

.sentence-en.playing {
  color: var(--primary-color);
  text-shadow: 0 0 1px var(--primary-color);
  background: rgba(108, 92, 231, 0.1); /* 增加背景高亮 */
  border-radius: var(--radius-md);
  padding: 4px 8px;
  margin-left: -8px; /* 抵消padding */
  width: calc(100% + 16px);
}

.btn-play-sentence {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-body);
  border: none;
  box-shadow: var(--shadow-clay-out-sm);
  margin-left: 10px;
  cursor: pointer;
  font-size: 14px;
  vertical-align: middle;
  transition: all 0.2s;
}

.btn-play-sentence:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-clay-out-hover);
  color: var(--primary-color);
}

.btn-play-sentence:active {
  box-shadow: var(--shadow-clay-in);
  transform: scale(0.95);
}

.sentence-zh {
  font-size: 16px;
  color: var(--text-secondary);
}

@keyframes fadeIn {
  from {opacity: 0;}
  to {opacity: 1;}
}

@keyframes slideUp {
  from {transform: translateY(100px) scale(0.9); opacity: 0;}
  to {transform: translateY(0) scale(1); opacity: 1;}
}