/* 通用样式 */
:root {
  --primary-color: #4a6cf7;
  --secondary-color: #6c757d;
  --light-bg: #ffffff;
  --light-text: #212529;
  --light-border: #dee2e6;
  --light-hover: #f8f9fa;
  --dark-bg: #212529;
  --dark-text: #f8f9fa;
  --dark-border: #495057;
  --dark-hover: #343a40;
}

body {
  transition: background-color 0.3s ease, color 0.3s ease;
  padding-top: 56px;
}

body.light-mode {
  background-color: var(--light-bg);
  color: var(--light-text);
}

body.dark-mode {
  background-color: var(--dark-bg);
  color: var(--dark-text);
}

.navbar {
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.light-mode .navbar {
  background-color: var(--light-bg);
  border-bottom: 1px solid var(--light-border);
}

.dark-mode .navbar {
  background-color: var(--dark-bg);
  border-bottom: 1px solid var(--dark-border);
}

.light-mode .navbar-brand, .light-mode .nav-link {
  color: var(--light-text);
}

.dark-mode .navbar-brand, .dark-mode .nav-link {
  color: var(--dark-text);
}

.light-mode .nav-link:hover {
  color: var(--primary-color);
}

.dark-mode .nav-link:hover {
  color: var(--primary-color);
}

/* 修复深色模式下导航栏选中项颜色 */
.light-mode .nav-link.active {
  color: var(--primary-color);
  font-weight: 600;
}

.dark-mode .nav-link.active {
  color: var(--primary-color);
  font-weight: 600;
}

/* 修复深色模式下按钮图标颜色 */
.light-mode .btn-outline-secondary {
  color: var(--light-text);
  border-color: var(--light-border);
}

.dark-mode .btn-outline-secondary {
  color: var(--dark-text);
  border-color: var(--dark-border);
}

.light-mode .navbar-toggler-icon {
  filter: brightness(0.8);
}

.dark-mode .navbar-toggler-icon {
  filter: brightness(2);
}

.content-container {
  max-width: 900px;
  margin: 2rem auto;
  padding: 2rem;
  border-radius: 8px;
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.light-mode .content-container {
  background-color: var(--light-bg);
  border: 1px solid var(--light-border);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.dark-mode .content-container {
  background-color: var(--dark-bg);
  border: 1px solid var(--dark-border);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

.language-switch, .theme-switch {
  cursor: pointer;
}

.language-switch .dropdown-menu, .theme-switch .dropdown-menu {
  min-width: 100px;
}

.light-mode .dropdown-menu {
  background-color: var(--light-bg);
  border: 1px solid var(--light-border);
}

.dark-mode .dropdown-menu {
  background-color: var(--dark-bg);
  border: 1px solid var(--dark-border);
}

.light-mode .dropdown-item {
  color: var(--light-text);
}

.dark-mode .dropdown-item {
  color: var(--dark-text);
}

.light-mode .dropdown-item:hover {
  background-color: var(--light-hover);
}

.dark-mode .dropdown-item:hover {
  background-color: var(--dark-hover);
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 1.5rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

h1 {
  font-size: 2rem;
  border-bottom: 2px solid;
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

.light-mode h1 {
  border-color: var(--light-border);
}

.dark-mode h1 {
  border-color: var(--dark-border);
}

h2 {
  font-size: 1.75rem;
  margin-top: 2rem;
}

h3 {
  font-size: 1.5rem;
  margin-top: 1.75rem;
}

p {
  margin-bottom: 1rem;
  line-height: 1.6;
}

ul, ol {
  margin-bottom: 1rem;
  padding-left: 2rem;
}

li {
  margin-bottom: 0.5rem;
}

strong {
  font-weight: 600;
}

.effective-date {
  font-style: italic;
  margin-bottom: 2rem;
  display: block;
}

.section-divider {
  height: 1px;
  margin: 2rem 0;
  transition: background-color 0.3s ease;
}

.light-mode .section-divider {
  background-color: var(--light-border);
}

.dark-mode .section-divider {
  background-color: var(--dark-border);
}

.footer {
  text-align: center;
  padding: 2rem 0;
  margin-top: 2rem;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.light-mode .footer {
  background-color: var(--light-bg);
  border-top: 1px solid var(--light-border);
}

.dark-mode .footer {
  background-color: var(--dark-bg);
  border-top: 1px solid var(--dark-border);
}

.contact-info {
  margin-top: 1rem;
}

.contact-info p {
  margin-bottom: 0.5rem;
}

/* 隐藏非当前语言内容 */
.zh-content, .en-content {
  display: none;
}

html[lang="zh"] .zh-content {
  display: block;
}

html[lang="en"] .en-content {
  display: block;
}

/* 响应式调整 - 优化移动端 */
@media (max-width: 768px) {
  .content-container {
    padding: 1.5rem;
    margin: 1rem;
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  h3 {
    font-size: 1.25rem;
  }
  
  /* 确保移动端下拉菜单可见 */
  .navbar-collapse {
    background-color: inherit;
    padding: 0.5rem;
    border-radius: 0.25rem;
  }
  
  .light-mode .navbar-collapse {
    border: 1px solid var(--light-border);
  }
  
  .dark-mode .navbar-collapse {
    border: 1px solid var(--dark-border);
  }
  
  /* 移动端下拉菜单项间距 */
  .navbar-nav .nav-item {
    margin-bottom: 0.5rem;
  }
  
  /* 移动端工具栏按钮样式 */
  .d-flex {
    margin-top: 0.5rem;
    width: 100%;
    justify-content: space-between;
  }
  
  .language-switch, .theme-switch {
    flex: 1;
    margin: 0 0.25rem;
  }
  
  .language-switch .btn, .theme-switch .btn {
    width: 100%;
  }
}

/* 打印样式 */
@media print {
  body {
    padding-top: 0;
  }
  
  .navbar, .footer, .language-switch, .theme-switch {
    display: none;
  }
  
  .content-container {
    box-shadow: none;
    border: none;
    padding: 0;
    margin: 0;
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  h3 {
    font-size: 1.25rem;
  }
}