/* 重置样式和基础设置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333333;
  background-color: #ffffff;
}

/* 颜色变量 */
:root {
  --primary-blue: #468bff;
  --primary-blue-light: #6caeff;
  --primary-blue-dark: #2f6fbf;
  --white: #ffffff;
  --black: #000000;
  --dark-gray: #333333;
  --medium-gray: #999999;
  --light-gray: #f0f0f0;
  --success-green: #4caf50;
  --error-red: #f44336;
}

/* 页头样式 */
.header {
  background-color: var(--white);
  /* border-bottom: 1px solid var(--light-gray); */ /* 移除边框，使用阴影 */
  /* box-shadow:
    2px 2px 2px rgba(0,0,0,0.039),
    5px 5px 6px rgba(0,0,0,0.057),
    10px 9px 12px rgba(0,0,0,0.07); */
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 60px;
  margin-bottom: 10px;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
  height: 100%;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo i {
  font-size: 24px;
  color: var(--primary-blue);
}

.logo h1 {
  font-size: 20px;
  color: var(--dark-gray);
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 15px;
  flex: 1;
  justify-content: flex-end;
}

.search-container {
  position: relative;
  display: flex;
  align-items: center;
}

.search-container input {
  padding: 10px 40px 10px 15px;
  border: 1px solid var(--medium-gray);
  border-radius: 25px;
  font-size: 16px;
  width: 300px;
  outline: none;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.search-container input:focus {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px rgba(74, 144, 255, 0.1);
}

.search-container i {
  position: absolute;
  right: 15px;
  color: var(--medium-gray);
  pointer-events: none;
  font-size: 18px;
}

.hamburger-menu {
  display: none;
  background: none;
  border: none;
  font-size: 20px;
  color: var(--dark-gray);
  cursor: pointer;
  padding: 8px;
  position: relative; /* 确保图标位置稳定 */
  z-index: 1100; /* 确保在侧边栏之上 */
}

.hamburger-menu i {
  transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.hamburger-menu.open .fa-bars {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(90deg); /* 旋转并隐藏 */
}

.hamburger-menu.open .fa-times {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0deg); /* 显示并恢复 */
}

/* 默认隐藏叉号图标 */
.hamburger-menu .fa-times {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(-90deg); /* 初始旋转隐藏 */
}

/* 主容器 */
.main-container {
  display: flex;
  margin-top: 60px;
  min-height: calc(100vh - 60px);
}

/* 侧边栏 */
.sidebar {
  width: 280px;
  /* border-right: 1px solid var(--light-gray); */
  background-color: #fdfeff;
  overflow-y: auto;
  position: fixed;
  top: 60px;
  transition: transform 0.3s ease;
}

.sidebar-content {
  padding: 20px;
}

.nav-section {
  margin-bottom: 20px;
}

.section-header {
  color: var(--medium-gray);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 15px;
  background-color: var(--white);
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 8px;
  transition: all 0.3s;
}

.section-header.active {
  background-color: var(--white); /* Set background to white */
  color: black; /* Set text color to black */
}

.section-header.active .section-icon {
  color: var(--primary-blue); /* Set icon color to primary blue */
}

.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 16px;
}

.section-icon {
  font-size: 18px;
}

.expand-icon {
  transition: transform 0.3s;
}

.section-header.expanded .expand-icon {
  transform: rotate(90deg);
}

.subsection-list {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-in-out, padding-top 0.4s ease-in-out,
    padding-bottom 0.4s ease-in-out;
  padding-left: 15px;
  padding-top: 0;
  padding-bottom: 0;
}

.subsection-list.expanded {
  max-height: 1000px; /* 增加max-height以适应更多内容，确保平滑过渡 */
  padding-top: 5px;
  padding-bottom: 5px;
}

.subsection-item {
  color: var(--medium-gray);
  padding: 8px 15px;
  margin: 4px 0;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: space-between;
}

.subsection-item.active {
  background-color: var(--white); /* Set background to white */
  color: var(--dark-gray); /* Set text color to black */
}

.subsection-item.active .subsection-icon {
  color: var(--primary-blue); /* Set icon color to primary blue */
}

.term-count {
  font-size: 12px;
  opacity: 0.8;
}

/* 内容区域 */
.content-area {
  flex: 1;
  margin-left: 280px;
  padding: 20px;
  background-color: #fdfeff;
  margin-bottom: 100px; /* Add margin to push content above the footer */
}

/* 模块标签 */
.module-tabs {
  display: flex;
  gap: 2px;
  margin-bottom: 20px;
  background-color: var(--light-gray);
  padding: 4px;
  border-radius: 8px;
}

.tab-button {
  flex: 1;
  padding: 12px 20px;
  border: none;
  border-radius: 6px;
  background-color: transparent;
  color: var(--medium-gray);
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
}

.tab-button.active {
  background-color: var(--primary-blue);
  color: var(--white);
}

/* 模块内容 */
.module {
  display: none;
}

.module.active {
  display: block;
}

/* 词汇浏览模块 */
.module-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  gap: 20px;
}

.search-controls {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.search-controls input {
  width: 100%;
  padding: 10px 40px 10px 15px;
  border: 1px solid var(--medium-gray);
  border-radius: 25px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.3s;
}

.search-controls input:focus {
  border-color: var(--primary-blue);
}

.search-controls i {
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--medium-gray);
}

.global-toggle-btn {
  padding: 10px 20px;
  background-color: var(--primary-blue);
  color: var(--white);
  border: none;
  border-radius: 25px;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  white-space: nowrap;
}

.vocabulary-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 15px;
}

.vocab-item {
  background-color: var(--white);
  border: 1px solid var(--light-gray);
  border-radius: 8px;
  padding: 15px;
  transition: all 0.3s;
}

.vocab-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}

.chinese-term {
  font-weight: 600;
  font-size: 16px;
  color: var(--dark-gray);
  flex: 1;
}

.vocab-controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

.toggle-btn {
  padding: 6px 12px;
  background-color: var(--primary-blue);
  color: var(--white);
  border: none;
  border-radius: 15px;
  cursor: pointer;
  font-size: 12px;
  transition: all 0.3s;
}

.remember-btn {
  padding: 6px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 16px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.remember-btn.not-remembered {
  background-color: white;
  color: var(--dark-gray);
}

.remember-btn.remembered {
  background-color: var(--success-green);
  color: var(--white);
}

.english-term {
  color: var(--dark-gray);
  font-size: 14px;
  margin-top: 8px;
  display: none;
}

.english-term.visible {
  display: block;
}

/* 闪卡模块 */

.mode-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: var(--primary-blue);
  color: var(--white);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 14px;
}

.mode-toggle-btn {
  padding: 8px 16px;
  background-color: var(--primary-blue);
  color: var(--white);
  border: none;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.flashcard-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.flashcard {
  width: 400px;
  height: 250px;
  perspective: 1000px;
  cursor: pointer;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

.flashcard.flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border: 2px solid var(--light-gray);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--white);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.flashcard-back {
  transform: rotateY(180deg);
}

.card-content {
  font-size: 18px;
  font-weight: 500;
  color: var(--dark-gray);
  padding: 20px;
  text-align: center;
}

.flashcard-controls {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-btn {
  padding: 15px 20px;
  background-color: var(--primary-blue);
  color: var(--white);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 100px;
  justify-content: center;
}

.nav-btn:disabled {
  background-color: var(--medium-gray);
  cursor: not-allowed;
}

.knowledge-buttons {
  display: flex;
  gap: 10px;
}

.knowledge-btn {
  padding: 15px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--white);
  min-width: 100px;
  justify-content: center;
}

.know-btn {
  background-color: var(--success-green);
}

.unknown-btn {
  background-color: var(--error-red);
}

.progress-indicator {
  font-size: 16px;
  color: var(--medium-gray);
  font-weight: 500;
}

/* 默写模块 */
.dictation-container {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: 15px;
}

.mode-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
  background: var(--white);
  border-radius: 12px;
  margin-bottom: 20px;
  border: 1px solid var(--light-gray);
}

.mode-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--white);
  font-weight: 500;
}

.mode-toggle-btn {
  padding: 8px 16px;
  background: var(--primary-blue);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.3s ease;
}

.flashcard-module .mode-controls {
  max-width: 400px;
  width: 100%;
  margin: 0 auto;
}

.question-area {
  background: var(--white);
  border-radius: 12px;
  margin-bottom: 20px;
  border: 2px solid var(--primary-blue);
  box-shadow: 0 4px 15px rgba(74, 144, 255, 0.1);
}

.question-text {
  font-size: 20px;
  font-weight: 600;
  color: var(--dark-gray);
  text-align: center;
  padding: 40px 20px;
}

.chinese-prompt {
  font-size: 24px;
  font-weight: 600;
  color: var(--dark-gray);
  margin-bottom: 30px;
  padding: 20px;
  background-color: var(--light-gray);
  border-radius: 12px;
}

.input-container {
  background: var(--white);
  padding: 25px;
  border-radius: 12px;
  margin-bottom: 25px;
  border: 1px solid var(--light-gray);
  display: flex;
  gap: 15px;
  align-items: center;
  flex-wrap: wrap;
}

#dictation-input {
  flex: 1;
  min-width: 200px;
  padding: 15px;
  font-size: 16px;
  border: 2px solid var(--light-gray);
  border-radius: 8px;
  transition: all 0.3s ease;
  outline: none;
}

#dictation-input:focus {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px rgba(74, 144, 255, 0.1);
}

.input-container input[type="text"] {
  flex: 1;
  min-width: 200px;
  padding: 15px;
  font-size: 16px;
  border: 2px solid var(--light-gray);
  border-radius: 8px;
  transition: all 0.3s ease;
  outline: none;
}

.input-container input[type="text"]:focus {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px rgba(74, 144, 255, 0.1);
}

.submit-btn,
.next-btn,
.show-answer-btn {
  padding: 15px 20px;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 100px;
  justify-content: center;
}

.submit-btn {
  background: var(--success-green);
}

.next-btn {
  background: var(--primary-blue);
}

.show-answer-btn {
  background: #f39c12;
}

.restart-btn {
  padding: 10px 15px;
  background: var(--error-red);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.3s ease;
}

.answer-feedback {
  background: var(--white);
  padding: 20px;
  border-radius: 12px;
  margin-bottom: 25px;
  border: 1px solid var(--light-gray);
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--medium-gray);
  /* 移除斜体效果 */
  font-style: normal;
}

/* 默写结果详情样式 */
.detailed-results {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.result-item {
  background-color: var(--white);
  border-radius: 12px;
  padding: 15px 20px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  text-align: left;
  transition: all 0.3s ease;
}

.result-item.correct {
  border: 2px solid var(--success-green);
  background-color: #e6ffe6; /* 淡绿色背景 */
}

.result-item.incorrect {
  border: 2px solid var(--error-red);
  background-color: #ffe6e6; /* 淡红色背景 */
}

.result-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  font-weight: 600;
  font-size: 16px;
}

.result-header .question-num {
  color: var(--dark-gray);
}

.result-content div {
  margin-bottom: 5px;
  color: var(--dark-gray);
  font-size: 14px;
  /* 移除斜体效果 */
  font-style: normal;
}

.result-content strong {
  color: var(--dark-gray);
}

/* 确保图标颜色正确 */
.text-success {
  color: var(--success-green);
}

.text-danger {
  color: var(--error-red);
}

.feedback-message {
  padding: 10px;
  margin-top: 15px;
  border-radius: 5px;
  font-weight: bold;
  text-align: center;
}

.feedback-message.correct {
  background-color: var(--success-green);
  color: var(--white);
}

.feedback-message.incorrect {
  background-color: var(--error-red);
  color: var(--white);
}

.progress-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  flex-wrap: wrap;
}

.dictation-progress {
  text-align: center;
  font-size: 16px;
  font-weight: 600;
  color: var(--dark-gray);
  padding: 15px;
  background: var(--white);
  border-radius: 8px;
  border: 1px solid var(--light-gray);
  flex: 1;
  min-width: 120px;
}

.matching-rules {
  text-align: left;
  margin-top: 30px;
}

.rules-toggle {
  background-color: var(--primary-blue-light);
  color: var(--white);
  padding: 10px 15px;
  border: 1px solid var(--light-gray);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: space-between; /* 使图标靠右 */
  gap: 8px;
  font-size: 14px;
  width: 100%;
}

.rules-toggle .toggle-icon {
  transition: transform 0.3s ease;
}

.rules-content.visible + .rules-toggle .toggle-icon {
  /* 修正选择器，确保在内容可见时图标旋转 */
  transform: rotate(90deg);
}

.rules-content {
  display: none;
  padding: 15px;
  background-color: var(--light-gray);
  border-radius: 6px;
  margin-top: 10px;
}

.rules-content.visible {
  display: block;
}

.rules-content h4 {
  color: var(--primary-blue);
  margin-bottom: 10px;
}

.rules-content ul {
  list-style-position: inside;
  color: var(--dark-gray);
}

.rules-content li {
  margin-bottom: 8px;
  line-height: 1.5;
}

/* 搜索覆盖层 */
.search-overlay {
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 999;
  display: none;
}

.search-overlay.visible {
  display: block;
}

.search-results {
  background-color: var(--white);
  margin: 20px;
  border-radius: 8px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
  padding: 20px;
}

.search-result-item {
  padding: 15px;
  border-bottom: 1px solid var(--light-gray);
  cursor: pointer;
  transition: background-color 0.3s;
}

.search-result-item:last-child {
  border-bottom: none;
}

.result-chinese {
  font-weight: 600;
  color: var(--dark-gray);
  margin-bottom: 5px;
}

.result-english {
  color: var(--medium-gray);
  font-size: 14px;
  margin-bottom: 5px;
}

.result-category {
  font-size: 12px;
  color: var(--primary-blue);
  background-color: var(--light-gray);
  padding: 2px 8px;
  border-radius: 10px;
  display: inline-block;
}

/* 脚注样式 */
.footer {
  background-color: var(--footer-bg-color);
  padding: 20px;
  text-align: center;
  width: 100%;
  box-sizing: border-box;
  backdrop-filter: blur(10px); /* 添加毛玻璃效果 */
  -webkit-backdrop-filter: blur(10px); /* 兼容性前缀 */
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.author-avatar {
  width: 50px; /* 设置头像宽度 */
  height: 50px; /* 设置头像高度 */
  border-radius: 50%; /* 使头像呈圆形 */
  object-fit: cover; /* 确保图片填充容器并保持比例 */
}

.footer p {
  font-size: 14px;
  color: var(--dark-gray);
}

a,
button,
input,
textarea,
select,
[tabindex]:focus,
[onclick]:focus,
.sidebar-content,
.flashcard-container {
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0); /* 移除移动端点击高亮 */
}

/* 媒体查询 */
@media (max-width: 768px) {
  .header-content {
    padding: 0 15px;
  }

  .search-container {
    display: none;
  }

  .hamburger-menu {
    display: block;
  }

  .sidebar {
    transform: translateX(-100%);
    z-index: 1001;
    height: calc(100vh - 60px);
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    display: none;
  }

  .sidebar-overlay.visible {
    display: block;
  }

  .content-area {
    margin-left: 0;
    padding: 15px;
  }

  .module-tabs {
    flex-direction: column;
    gap: 1px;
  }

  .tab-button {
    justify-content: flex-start;
    padding: 15px 20px;
  }

  .module-header {
    flex-direction: column;
    align-items: stretch;
    gap: 15px;
  }

  .search-controls {
    max-width: none;
  }

  .vocabulary-list {
    grid-template-columns: 1fr;
  }

  .flashcard {
    width: 100%;
    max-width: 350px;
  }

  .flashcard-controls {
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav-btn {
    flex: 1;
    min-width: 120px;
  }

  .knowledge-buttons {
    width: 100%;
    justify-content: center;
  }

  .knowledge-btn {
    flex: 1;
  }
}

@media (max-width: 480px) {
  .logo h1 {
    font-size: 16px;
  }

  .flashcard {
    height: 200px;
  }

  .card-content {
    font-size: 16px;
    padding: 15px;
  }

  .chinese-prompt {
    font-size: 20px;
    padding: 15px;
  }

  .input-container {
    flex-direction: column;
  }

  .submit-btn {
    justify-content: center;
  }
}

@media (min-width: 992px) {
  .search-result-item:hover {
    background-color: var(--light-gray);
  }

  .section-header:hover {
    color: black;
  }

  .subsection-icon:hover {
    font-size: 14px;
    color: var(--medium-gray);
  }

  .subsection-item:hover {
    color: black;
  }

  .tab-button:hover {
    background-color: var(--primary-blue-light);
    color: var(--white);
  }

  .global-toggle-btn:hover {
    background-color: var(--primary-blue-light);
  }

  .vocab-item:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  }

  .toggle-btn:hover {
    background-color: var(--primary-blue-light);
  }

  .mode-toggle-btn:hover {
    background-color: var(--primary-blue-light);
  }

  .nav-btn:hover {
    background: var(--primary-blue-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(74, 144, 255, 0.3);
  }

  .know-btn:hover {
    background: #27ae60;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.3);
  }

  .unknown-btn:hover {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
  }

  .mode-toggle-btn:hover {
    background: var(--primary-blue-light);
  }

  .submit-btn:hover {
    background: #27ae60;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.3);
  }

  .next-btn:hover {
    background: var(--primary-blue-light);
    transform: translateY(-2px);
  }

  .show-answer-btn:hover {
    background: #e67e22;
    transform: translateY(-2px);
  }

  .restart-btn:hover {
    background: #c0392b;
    transform: translateY(-1px);
  }

  .rules-toggle:hover {
    background-color: var(--primary-blue-light);
    color: var(--white);
  }
}

/* 快捷键提示框样式 */
.tooltip {
  position: absolute;
  background-color: #ffffff; /* 白色背景 */
  color: #333333; /* 深灰色文字 */
  padding: 6px 12px; /* 调整内边距 */
  border-radius: 6px; /* 更小的圆角 */
  font-size: 13px; /* 调整字体大小 */
  white-space: nowrap;
  z-index: 1000;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease-in-out, transform 0.2s ease-in-out;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15); /* 柔和的阴影 */
  border: 1px solid #e0e0e0; /* 浅灰色边框 */
}

.tooltip::before {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 6px solid #ffffff; /* 箭头颜色与背景相同 */
  top: -6px; /* 定位在提示框上方 */
  left: 50%;
  transform: translateX(-50%);
  z-index: 1001; /* 确保箭头在提示框之上 */
}

.tooltip::after {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-bottom: 7px solid #e0e0e0; /* 箭头边框颜色与边框相同 */
  top: -7px; /* 定位在提示框上方 */
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000; /* 确保箭头边框在箭头之下 */
}

.tooltip.show {
  opacity: 1;
  transform: translateY(-5px); /* 向上微移 */
}

/* 隐藏在触摸设备上 */
@media (pointer: coarse) {
  .tooltip {
    display: none !important;
  }
}

.nav-btn {
  padding: 15px 20px;
  background-color: var(--primary-blue);
  color: var(--white);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 100px;
  justify-content: center;
}

.nav-btn:disabled {
  background-color: var(--medium-gray);
  cursor: not-allowed;
}

.knowledge-buttons {
  display: flex;
  gap: 10px;
}

.knowledge-btn {
  padding: 15px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--white);
  min-width: 100px;
  justify-content: center;
}

.know-btn {
  background-color: var(--success-green);
}

.unknown-btn {
  background-color: var(--error-red);
}

.progress-indicator {
  font-size: 16px;
  color: var(--medium-gray);
  font-weight: 500;
}

/* 默写模块 */
.dictation-container {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: 15px;
}

.mode-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
  background: var(--white);
  border-radius: 12px;
  margin-bottom: 20px;
  border: 1px solid var(--light-gray);
}

.mode-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--white);
  font-weight: 500;
}

.mode-toggle-btn {
  padding: 8px 16px;
  background: var(--primary-blue);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.3s ease;
}

.flashcard-module .mode-controls {
  max-width: 400px;
  width: 100%;
  margin: 0 auto;
}

.question-area {
  background: var(--white);
  border-radius: 12px;
  margin-bottom: 20px;
  border: 2px solid var(--primary-blue);
  box-shadow: 0 4px 15px rgba(74, 144, 255, 0.1);
}

.question-text {
  font-size: 20px;
  font-weight: 600;
  color: var(--dark-gray);
  text-align: center;
  padding: 40px 20px;
}

.chinese-prompt {
  font-size: 24px;
  font-weight: 600;
  color: var(--dark-gray);
  margin-bottom: 30px;
  padding: 20px;
  background-color: var(--light-gray);
  border-radius: 12px;
}

.input-container {
  background: var(--white);
  padding: 25px;
  border-radius: 12px;
  margin-bottom: 25px;
  border: 1px solid var(--light-gray);
  display: flex;
  gap: 15px;
  align-items: center;
  flex-wrap: wrap;
}

#dictation-input {
  flex: 1;
  min-width: 200px;
  padding: 15px;
  font-size: 16px;
  border: 2px solid var(--light-gray);
  border-radius: 8px;
  transition: all 0.3s ease;
  outline: none;
}

#dictation-input:focus {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px rgba(74, 144, 255, 0.1);
}

.input-container input[type="text"] {
  flex: 1;
  min-width: 200px;
  padding: 15px;
  font-size: 16px;
  border: 2px solid var(--light-gray);
  border-radius: 8px;
  transition: all 0.3s ease;
  outline: none;
}

.input-container input[type="text"]:focus {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px rgba(74, 144, 255, 0.1);
}

.submit-btn,
.next-btn,
.show-answer-btn {
  padding: 15px 20px;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 100px;
  justify-content: center;
}

.submit-btn {
  background: var(--success-green);
}

.next-btn {
  background: var(--primary-blue);
}

.show-answer-btn {
  background: #f39c12;
}

.restart-btn {
  padding: 10px 15px;
  background: var(--error-red);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.3s ease;
}

.answer-feedback {
  background: var(--white);
  padding: 20px;
  border-radius: 12px;
  margin-bottom: 25px;
  border: 1px solid var(--light-gray);
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--medium-gray);
  font-style: italic;
}

.feedback-message {
  padding: 10px;
  margin-top: 15px;
  border-radius: 5px;
  font-weight: bold;
  text-align: center;
}

.feedback-message.correct {
  background-color: var(--success-green);
  color: var(--white);
}

.feedback-message.incorrect {
  background-color: var(--error-red);
  color: var(--white);
}

.progress-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  flex-wrap: wrap;
}

.dictation-progress {
  text-align: center;
  font-size: 16px;
  font-weight: 600;
  color: var(--dark-gray);
  padding: 15px;
  background: var(--white);
  border-radius: 8px;
  border: 1px solid var(--light-gray);
  flex: 1;
  min-width: 120px;
}

.matching-rules {
  text-align: left;
  margin-top: 30px;
}

.rules-toggle {
  background-color: var(--primary-blue-light);
  color: var(--white);
  padding: 10px 15px;
  border: 1px solid var(--light-gray);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  width: 100%;
}

.rules-content {
  display: none;
  padding: 15px;
  background-color: var(--light-gray);
  border-radius: 6px;
  margin-top: 10px;
}

.rules-content.visible {
  display: block;
}

.rules-content h4 {
  color: var(--primary-blue);
  margin-bottom: 10px;
}

.rules-content ul {
  list-style-position: inside;
  color: var(--dark-gray);
}

.rules-content li {
  margin-bottom: 8px;
  line-height: 1.5;
}

/* 搜索覆盖层 */
.search-overlay {
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 999;
  display: none;
}

.search-overlay.visible {
  display: block;
}

.search-results {
  background-color: var(--white);
  margin: 20px;
  border-radius: 8px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
  padding: 20px;
}

.search-result-item {
  padding: 15px;
  border-bottom: 1px solid var(--light-gray);
  cursor: pointer;
  transition: background-color 0.3s;
}

.search-result-item:last-child {
  border-bottom: none;
}

.result-chinese {
  font-weight: 600;
  color: var(--dark-gray);
  margin-bottom: 5px;
}

.result-english {
  color: var(--medium-gray);
  font-size: 14px;
  margin-bottom: 5px;
}

.result-category {
  font-size: 12px;
  color: var(--primary-blue);
  background-color: var(--light-gray);
  padding: 2px 8px;
  border-radius: 10px;
  display: inline-block;
}

/* 脚注样式 */
.footer {
  background-color: var(--footer-bg-color);
  padding: 20px;
  text-align: center;
  width: 100%;
  box-sizing: border-box;
  backdrop-filter: blur(10px); /* 添加毛玻璃效果 */
  -webkit-backdrop-filter: blur(10px); /* 兼容性前缀 */
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.author-avatar {
  width: 50px; /* 设置头像宽度 */
  height: 50px; /* 设置头像高度 */
  border-radius: 50%; /* 使头像呈圆形 */
  object-fit: cover; /* 确保图片填充容器并保持比例 */
}

.footer p {
  font-size: 14px;
  color: var(--dark-gray);
}

a,
button,
input,
textarea,
select,
[tabindex]:focus,
[onclick]:focus,
.sidebar-content,
.flashcard-container {
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0); /* 移除移动端点击高亮 */
}

/* 媒体查询 */
@media (max-width: 768px) {
  .header-content {
    padding: 0 15px;
  }

  .search-container {
    display: none;
  }

  .hamburger-menu {
    display: block;
  }

  .sidebar {
    transform: translateX(-100%);
    z-index: 1001;
    height: calc(100vh - 60px);
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    display: none;
  }

  .sidebar-overlay.visible {
    display: block;
  }

  .content-area {
    margin-left: 0;
    padding: 15px;
  }

  .module-tabs {
    flex-direction: column;
    gap: 1px;
  }

  .tab-button {
    justify-content: flex-start;
    padding: 15px 20px;
  }

  .module-header {
    flex-direction: column;
    align-items: stretch;
    gap: 15px;
  }

  .search-controls {
    max-width: none;
  }

  .vocabulary-list {
    grid-template-columns: 1fr;
  }

  .flashcard {
    width: 100%;
    max-width: 350px;
  }

  .flashcard-controls {
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav-btn {
    flex: 1;
    min-width: 120px;
  }

  .knowledge-buttons {
    width: 100%;
    justify-content: center;
  }

  .knowledge-btn {
    flex: 1;
  }
}

@media (max-width: 480px) {
  .logo h1 {
    font-size: 16px;
  }

  .flashcard {
    height: 200px;
  }

  .card-content {
    font-size: 16px;
    padding: 15px;
  }

  .chinese-prompt {
    font-size: 20px;
    padding: 15px;
  }

  .input-container {
    flex-direction: column;
  }

  .submit-btn {
    justify-content: center;
  }
}

@media (min-width: 992px) {
  .search-result-item:hover {
    background-color: var(--light-gray);
  }

  .section-header:hover {
    color: black;
  }

  .subsection-icon:hover {
    font-size: 14px;
    color: var(--medium-gray);
  }

  .subsection-item:hover {
    color: black;
  }

  .tab-button:hover {
    background-color: var(--primary-blue-light);
    color: var(--white);
  }

  .global-toggle-btn:hover {
    background-color: var(--primary-blue-light);
  }

  .vocab-item:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  }

  .toggle-btn:hover {
    background-color: var(--primary-blue-light);
  }

  .mode-toggle-btn:hover {
    background-color: var(--primary-blue-light);
  }

  .nav-btn:hover {
    background: var(--primary-blue-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(74, 144, 255, 0.3);
  }

  .know-btn:hover {
    background: #27ae60;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.3);
  }

  .unknown-btn:hover {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
  }

  .mode-toggle-btn:hover {
    background: var(--primary-blue-light);
  }

  .submit-btn:hover {
    background: #27ae60;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.3);
  }

  .next-btn:hover {
    background: var(--primary-blue-light);
    transform: translateY(-2px);
  }

  .show-answer-btn:hover {
    background: #e67e22;
    transform: translateY(-2px);
  }

  .restart-btn:hover {
    background: #c0392b;
    transform: translateY(-1px);
  }

  .rules-toggle:hover {
    background-color: var(--primary-blue-light);
    color: var(--white);
  }
}