/* 现代学习平台配色 - 蓝色主题 */
:root {
  --primary-blue: #1976d2;
  --primary-blue-light: #42a5f5;
  --primary-blue-dark: #1565c0;
  --secondary-blue: #2196f3;
  --accent-blue: #03a9f4;
  --success-green: #4caf50;
  --warning-orange: #ff9800;
  --error-red: #f44336;
  --info-cyan: #00bcd4;
  --neutral-50: #fafafa;
  --neutral-100: #f5f5f5;
  --neutral-200: #eeeeee;
  --neutral-300: #e0e0e0;
  --neutral-400: #bdbdbd;
  --neutral-500: #9e9e9e;
  --neutral-600: #757575;
  --neutral-700: #616161;
  --neutral-800: #424242;
  --neutral-900: #212121;
  --text-primary: #212121;
  --text-secondary: #757575;
  --background-light: #fafafa;
  --background-white: #ffffff;
  --border-light: #e0e0e0;
  --shadow-light: rgba(0, 0, 0, 0.12);
  --shadow-medium: rgba(0, 0, 0, 0.16);
}

/* 基础样式 */
body {
  background: linear-gradient(135deg, #f8fafc 0%, #e3f2fd 50%, #f1f8e9 100%);
  min-height: 100vh;
  font-family: "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-primary);
  line-height: 1.6;
}

/* 导航栏样式 - 修改为现代蓝色 */
nav.navbar.bg-green-primary {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%) !important;
  box-shadow: 0 2px 20px rgba(25, 118, 210, 0.15);
}

footer.bg-green-dark {
  background: linear-gradient(135deg, var(--neutral-800) 0%, var(--neutral-900) 100%) !important;
}

/* 导航栏品牌名称 */
.navbar-brand {
  font-weight: 600;
  font-size: 1.25rem;
  color: white !important;
  text-shadow: none;
  max-width: 80%;
  white-space: normal;
  line-height: 1.3;
}

.navbar-nav .nav-link {
  font-weight: 500;
  color: rgba(255, 255, 255, 0.95) !important;
  transition: all 0.3s ease;
  padding: 0.5rem 1rem !important;
  border-radius: 6px;
  margin: 0 2px;
}

.navbar-nav .nav-link:hover {
  color: white !important;
  background-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}

/* 下拉菜单样式 */
.dropdown-menu {
  border: 1px solid var(--border-light);
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  background: var(--background-white);
  backdrop-filter: blur(10px);
  z-index: 1031;
  position: absolute;
}

.dropdown-menu.show {
  z-index: 1031;
  display: block;
}

.navbar-collapse {
  z-index: 1030;
}

.nav-item.dropdown {
  position: relative;
  z-index: 1030;
}

.dropdown-item {
  padding: 0.75rem 1.25rem;
  transition: all 0.3s ease;
  color: var(--text-primary);
}

.dropdown-item:hover {
  background-color: var(--neutral-100);
  color: var(--primary-blue);
  transform: translateX(3px);
}

/* 多列下拉菜单样式 */
.dropdown-menu-multi-column {
  min-width: 800px !important;
  max-width: 1000px !important;
  padding: 1rem;
  /* 防止超出屏幕边界 */
  max-width: calc(100vw - 40px) !important;
  left: auto !important;
  right: 0 !important;
  transform: translateX(0) !important;
}

/* 确保下拉菜单不超出屏幕右边界 */
.nav-item.dropdown .dropdown-menu-multi-column {
  position: absolute;
  left: auto !important;
  right: 0 !important;
  transform: none !important;
}

.dropdown-menu-container {
  display: flex;
  gap: 1.5rem;
  min-height: 350px;
  /* 防止内容溢出 */
  overflow-x: auto;
  overflow-y: visible;
}

.dropdown-column {
  flex: 1;
  min-width: 180px;
  /* 防止列内容被压缩过小 */
  flex-shrink: 0;
}

.dropdown-column .dropdown-header {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary-blue);
  padding: 0.5rem 0;
  margin-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.dropdown-column .dropdown-item {
  padding: 0.5rem 0.75rem;
  margin-bottom: 0.25rem;
  border-radius: 6px;
  font-size: 0.9rem;
}

.dropdown-column .dropdown-item:hover {
  background-color: var(--primary-blue);
  color: white;
  transform: translateX(5px);
}

.dropdown-column .dropdown-item.text-danger:hover {
  background-color: var(--error-red);
  color: white;
}

/* 安全管理专用样式 */
.dropdown-column h6.dropdown-header:has-text("🛡️ 安全管理") {
  color: #dc3545;
  border-bottom-color: #dc3545;
  background: linear-gradient(90deg, rgba(220, 53, 69, 0.1) 0%, rgba(220, 53, 69, 0.05) 100%);
  padding: 0.75rem 0.5rem;
  border-radius: 4px;
}

/* 安全相关链接的特殊样式 */
.dropdown-column .dropdown-item[href*="useractivitylog"] {
  border-left: 3px solid transparent;
  transition: all 0.3s ease;
}

.dropdown-column .dropdown-item[href*="useractivitylog"]:hover {
  border-left-color: #dc3545;
  background: linear-gradient(90deg, rgba(220, 53, 69, 0.1) 0%, rgba(220, 53, 69, 0.05) 100%);
  transform: translateX(3px);
}

.dropdown-column .dropdown-item[href*="security/"]:hover {
  border-left-color: #007bff;
  background: linear-gradient(90deg, rgba(0, 123, 255, 0.1) 0%, rgba(0, 123, 255, 0.05) 100%);
  transform: translateX(3px);
}

/* 可疑活动和高风险活动的特殊标识 */
.dropdown-column .dropdown-item[href*="is_suspicious"] {
  position: relative;
}

.dropdown-column .dropdown-item[href*="is_suspicious"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: #dc3545;
  border-radius: 2px;
}

.dropdown-column .dropdown-item[href*="risk_level__exact=high"]::before {
  background: #fd7e14;
}

/* 响应式处理 */
@media (max-width: 992px) {
  .dropdown-menu-multi-column {
    min-width: 500px !important;
    max-width: calc(100vw - 30px) !important;
  }
  
  .dropdown-menu-container {
    gap: 1.5rem;
  }
  
  .dropdown-column {
    min-width: 180px;
  }
}

@media (max-width: 768px) {
  .dropdown-menu-multi-column {
    min-width: 320px !important;
    max-width: calc(100vw - 20px) !important;
    /* 在移动设备上使用更小的内边距 */
    padding: 0.75rem;
  }
  
  .dropdown-menu-container {
    flex-direction: column;
    gap: 1rem;
    min-height: auto;
  }
  
  .dropdown-column {
    min-width: auto;
    flex-shrink: 1;
  }
  
  .dropdown-column .dropdown-header {
    font-size: 0.8rem;
    padding: 0.4rem 0;
    margin-bottom: 0.4rem;
  }
  
  .dropdown-column .dropdown-item {
    padding: 0.4rem 0.6rem;
    font-size: 0.85rem;
  }
}

@media (max-width: 576px) {
  .dropdown-menu-multi-column {
    min-width: 280px !important;
    max-width: calc(100vw - 15px) !important;
    padding: 0.5rem;
  }
  
  .dropdown-menu-container {
    gap: 0.75rem;
  }
  
  .dropdown-column .dropdown-header {
    font-size: 0.75rem;
  }
  
  .dropdown-column .dropdown-item {
    padding: 0.3rem 0.5rem;
    font-size: 0.8rem;
  }
}

/* 按钮样式 - 现代化设计 */
.btn-primary {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
  border: none;
  border-radius: 8px;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(25, 118, 210, 0.3);
  color: white;
  letter-spacing: 0.025em;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-blue-dark) 0%, var(--primary-blue) 100%);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(25, 118, 210, 0.4);
  color: white;
}

.btn-success {
  background: linear-gradient(135deg, var(--success-green) 0%, #66bb6a 100%);
  border: none;
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.3s ease;
  color: white;
  box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.btn-success:hover {
  background: linear-gradient(135deg, #43a047 0%, var(--success-green) 100%);
  transform: translateY(-1px);
  color: white;
  box-shadow: 0 4px 12px rgba(76, 175, 80, 0.4);
}

.btn-outline-primary {
  color: var(--primary-blue);
  border: 2px solid var(--primary-blue);
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.3s ease;
  background: transparent;
}

.btn-outline-primary:hover {
  background: var(--primary-blue);
  border-color: var(--primary-blue);
  transform: translateY(-1px);
  color: white;
  box-shadow: 0 2px 8px rgba(25, 118, 210, 0.3);
}

.btn-outline-success {
  color: var(--success-green);
  border: 2px solid var(--success-green);
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.3s ease;
  background: transparent;
}

.btn-outline-success:hover {
  background: var(--success-green);
  border-color: var(--success-green);
  transform: translateY(-1px);
  color: white;
  box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.btn-info {
  background: linear-gradient(135deg, var(--info-cyan) 0%, #26c6da 100%);
  border: none;
  color: white;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 188, 212, 0.3);
}

.btn-warning {
  background: linear-gradient(135deg, var(--warning-orange) 0%, #ffb74d 100%);
  border: none;
  color: white;
  border-radius: 8px;
}

.btn-danger {
  background: linear-gradient(135deg, var(--error-red) 0%, #ef5350 100%);
  border: none;
  color: white;
  border-radius: 8px;
}

/* 卡片样式 - 现代简洁设计 */
.card {
  border: 1px solid var(--border-light);
  border-radius: 12px;
  box-shadow: 0 2px 12px var(--shadow-light);
  transition: all 0.3s ease;
  background: var(--background-white);
  overflow: hidden;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow-medium);
  border-color: var(--primary-blue-light);
}

.card-header {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
  border: none;
  border-radius: 12px 12px 0 0 !important;
  color: white;
  font-weight: 600;
  padding: 1.25rem 1.5rem;
}

.course-card {
  transition: all 0.3s ease;
  border: 1px solid var(--border-light);
  background: var(--background-white);
}

.course-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(25, 118, 210, 0.15);
  border-color: var(--primary-blue-light);
}

/* 知识点样式 */
.knowledge-point {
  border-left: 4px solid var(--primary-blue);
  padding-left: 1.5rem;
  background: var(--neutral-50);
  border-radius: 0 8px 8px 0;
  margin-bottom: 1.5rem;
  transition: all 0.3s ease;
}

.knowledge-point:hover {
  background: var(--neutral-100);
  border-left-color: var(--secondary-blue);
  transform: translateX(4px);
}

.knowledge-point-header {
  background: var(--neutral-100);
  border-radius: 8px;
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 1px solid var(--border-light);
}

.knowledge-point-header:hover {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
  color: white;
  transform: translateX(6px);
  box-shadow: 0 2px 12px rgba(25, 118, 210, 0.3);
}

.knowledge-point-content {
  background: var(--background-white);
  border-radius: 0 0 8px 8px;
  border: 1px solid var(--border-light);
  border-top: none;
}

/* 内容项样式 */
.content-item {
  background: var(--background-white);
  border: 1px solid var(--border-light) !important;
  border-radius: 8px;
  transition: all 0.3s ease;
  margin-bottom: 0.75rem;
}

.content-item:hover {
  background: var(--neutral-50);
  border-color: var(--primary-blue-light) !important;
  transform: translateX(4px);
  box-shadow: 0 2px 8px var(--shadow-light);
}

.content-text {
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.25rem;
  background: var(--background-white);
}

/* 进度条样式 */
.progress {
  height: 8px;
  border-radius: 12px;
  background: var(--neutral-200);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.progress-bar {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
  border-radius: 12px;
  transition: width 0.8s ease;
}

/* 徽章样式 */
.badge {
  font-size: 0.75rem;
  border-radius: 6px;
  padding: 0.4em 0.8em;
  font-weight: 500;
  letter-spacing: 0.025em;
}

.badge.bg-primary {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%) !important;
}

.badge.bg-success {
  background: linear-gradient(135deg, var(--success-green) 0%, #66bb6a 100%) !important;
}

.badge.bg-info {
  background: linear-gradient(135deg, var(--info-cyan) 0%, #26c6da 100%) !important;
}

/* 表单样式 */
.form-control {
  border: 2px solid var(--border-light);
  border-radius: 8px;
  transition: all 0.3s ease;
  background: var(--background-white);
  padding: 0.75rem 1rem;
  color: var(--text-primary);
}

.form-control:focus {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 0.2rem rgba(25, 118, 210, 0.15);
  background: var(--background-white);
}

.form-select {
  border: 2px solid var(--border-light);
  border-radius: 8px;
  background: var(--background-white);
  color: var(--text-primary);
}

.form-select:focus {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 0.2rem rgba(25, 118, 210, 0.15);
}

/* 表格样式 */
.table {
  background: var(--background-white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 12px var(--shadow-light);
}

.table th {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
  color: white;
  border: none;
  font-weight: 600;
  padding: 1rem 1.25rem;
}

.table td {
  border-color: var(--border-light);
  padding: 1rem 1.25rem;
  background: var(--background-white);
}

.table tbody tr:hover {
  background: var(--neutral-50);
  transform: scale(1.005);
  transition: all 0.3s ease;
}

/* 警告框样式 */
.alert-success {
  background: linear-gradient(135deg, #e8f5e8 0%, #f1f8e9 100%);
  border: 1px solid #c8e6c9;
  color: #2e7d32;
  border-radius: 8px;
}

.alert-info {
  background: linear-gradient(135deg, #e3f2fd 0%, #f0f7ff 100%);
  border: 1px solid #bbdefb;
  color: var(--primary-blue-dark);
  border-radius: 8px;
}

.alert-warning {
  background: linear-gradient(135deg, #fff3e0 0%, #fff8f0 100%);
  border: 1px solid #ffcc02;
  color: #e65100;
  border-radius: 8px;
}

.alert-danger {
  background: linear-gradient(135deg, #ffebee 0%, #fff5f5 100%);
  border: 1px solid #ef9a9a;
  color: #c62828;
  border-radius: 8px;
}

/* PDF预览样式 */
.pdf-preview {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow-light);
  background: var(--background-white);
  margin-top: 1.5rem;
}

.pdf-viewer-container {
  background: var(--background-white);
  border-radius: 12px;
}

.pdf-loading {
  background: var(--neutral-100);
  border-radius: 8px;
  color: var(--primary-blue);
  padding: 2.5rem;
  text-align: center;
}

.pdf-error {
  background: var(--neutral-100);
  color: var(--error-red);
  border-radius: 8px;
  padding: 1.25rem;
}

/* 自定义 5 列布局 */
@media (min-width: 1200px) {
  .col-xl-5col {
    flex: 0 0 20%;
    max-width: 20%;
  }
}

/* 响应式调整 */
@media (max-width: 768px) {
  .container-fluid {
    padding-left: 15px;
    padding-right: 15px;
  }

  .course-card {
    margin-bottom: 1.5rem;
  }

  .knowledge-point-header {
    padding: 1rem;
  }

  .pdf-viewer-container {
    height: 400px !important;
  }

  .pdf-preview iframe {
    height: 300px !important;
  }

  .carousel-item img {
    height: 300px;
  }

  .hero-section {
    min-height: 300px;
  }

  .navbar-brand {
    font-size: 1.1rem;
  }
}

/* ASCII 艺术样式 */
.ascii-art {
    background-color: var(--neutral-50);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    font-family: 'Consolas', 'Monaco', 'Courier New', 'Lucida Console', monospace;
    font-size: 0.9rem;
    line-height: 1.2;
    white-space: pre;
    overflow-x: auto;
    color: var(--text-primary);
    box-shadow: 0 2px 8px var(--shadow-light);
}

.ascii-art:hover {
    background-color: var(--background-white);
    box-shadow: 0 4px 15px var(--shadow-medium);
}

/* 在 Markdown 内容中的 ASCII 艺术 */
.markdown-content .ascii-art {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    margin: 1rem 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .mermaid-chart {
    padding: 1rem;
    margin: 1rem 0;
  }
  
  .mermaid-chart svg {
    transform: scale(0.8);
    transform-origin: center;
  }
  
  .ascii-art {
    font-size: 0.8rem;
    padding: 1rem;
    overflow-x: scroll;
  }
}

/* 自定义滚动条 */
.content-text::-webkit-scrollbar {
  width: 8px;
}

.content-text::-webkit-scrollbar-track {
  background: var(--neutral-200);
  border-radius: 4px;
}

.content-text::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
  border-radius: 4px;
}

.content-text::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, var(--primary-blue-dark) 0%, var(--primary-blue) 100%);
}

/* 链接样式 */
a {
  color: var(--primary-blue);
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  color: var(--secondary-blue);
  text-decoration: none;
}

/* 面包屑导航 */
.breadcrumb {
  background: var(--neutral-100);
  border-radius: 8px;
  padding: 1rem 1.25rem;
}

.breadcrumb-item.active {
  color: var(--primary-blue);
}

/* 加载动画 */
.spinner-border {
  color: var(--primary-blue);
}

.spinner-border-sm {
  width: 1rem;
  height: 1rem;
}

/* 工具提示 */
.tooltip .tooltip-inner {
  background-color: var(--neutral-800);
  border-radius: 6px;
}

/* 模态框样式 */
.modal-header {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
  color: white;
  border-radius: 12px 12px 0 0;
  border-bottom: none;
}

.modal-content {
  border: none;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

/* 特殊效果类 */
.shadow-blue {
  box-shadow: 0 4px 20px rgba(25, 118, 210, 0.15) !important;
}

.text-blue {
  color: var(--primary-blue) !important;
}

.bg-blue-light {
  background: var(--neutral-50) !important;
}

/* 绿色主题兼容类 - 映射到蓝色主题 */
.btn-green-primary,
.bg-green-primary {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%) !important;
  border-color: var(--primary-blue) !important;
  color: white !important;
}

.btn-green-primary:hover {
  background: linear-gradient(135deg, var(--primary-blue-dark) 0%, var(--primary-blue) 100%) !important;
  color: white !important;
}

.text-green-primary,
.text-green-dark {
  color: var(--primary-blue) !important;
}

.bg-green-light {
  background: var(--neutral-50) !important;
}

.bg-green-secondary {
  background: var(--secondary-blue) !important;
}

.badge.bg-outline-green {
  background-color: transparent !important;
  border: 1px solid var(--primary-blue);
  color: var(--primary-blue);
}

.badge.bg-green-light {
  background-color: var(--neutral-100) !important;
  color: var(--primary-blue) !important;
}

/* 技术分享卡片样式 */
.tech-share-card {
  border: 1px solid var(--border-light);
  box-shadow: 0 2px 12px var(--shadow-light);
  transition: all 0.3s ease;
  border-radius: 12px;
  overflow: hidden;
  background: var(--background-white);
}

.tech-share-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(25, 118, 210, 0.15);
  border-color: var(--primary-blue-light);
}

/* 图标样式 */
.fa-graduation-cap,
.fa-book,
.fa-play-circle,
.fa-check-circle {
  color: var(--primary-blue);
}

/* 动画效果 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

/* 玻璃态效果 */
.glass-effect {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-light);
}

/* 隐藏类 */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* 轮播图样式 */
.hero-section {
  min-height: 500px;
}

.carousel-item img {
  height: 500px;
  width: 100%;
  object-fit: cover;
}

.carousel-caption {
  background: rgba(33, 33, 33, 0.8);
  border-radius: 8px;
  padding: 2rem;
  bottom: 20%;
  backdrop-filter: blur(5px);
}

/* 分页样式 */
.page-link {
  color: var(--primary-blue);
  border-color: var(--border-light);
  border-radius: 6px !important;
  margin: 0 2px;
  transition: all 0.3s ease;
}

.page-item.active .page-link {
  background-color: var(--primary-blue);
  border-color: var(--primary-blue);
  color: white;
}

.page-link:hover {
  color: var(--primary-blue-dark);
  background-color: var(--neutral-100);
  border-color: var(--primary-blue-light);
}

/* 点赞按钮样式 */
.like-btn {
  width: 40px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  transition: all 0.3s ease;
}

.like-btn:hover {
  transform: scale(1.05);
}

/* 搜索表单样式 */
.form-control::placeholder {
  color: var(--text-secondary);
}

/* 导航栏移动端优化 */
@media (max-width: 991.98px) {
  .navbar-collapse {
    background: rgba(25, 118, 210, 0.95);
    border-radius: 8px;
    margin-top: 0.5rem;
    padding: 1rem;
    backdrop-filter: blur(10px);
  }

  .navbar-nav .nav-link {
    padding: 0.75rem 1rem !important;
    margin: 2px 0;
  }
}

/* 卡片内容区域样式 */
.card-body {
  padding: 1.5rem;
}

.card-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.card-text {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 统计信息样式 */
.text-muted {
  color: var(--text-secondary) !important;
}

/* 按钮组样式 */
.btn-group .btn {
  border-radius: 6px;
  margin-right: 0.25rem;
}

.btn-group .btn:last-child {
  margin-right: 0;
}

/* 优化小屏幕下的布局 */
@media (max-width: 576px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .card-body {
    padding: 1.25rem;
  }

  .btn {
    font-size: 0.875rem;
    padding: 0.625rem 1.25rem;
  }
}

/* Markdown 内容样式 */
.markdown-content {
  line-height: 1.8;
  color: var(--text-primary);
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
  color: var(--primary-blue);
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

.markdown-content h1 {
  border-bottom: 2px solid var(--primary-blue-light);
  padding-bottom: 0.5rem;
}

.markdown-content h2 {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.3rem;
}

.markdown-content p {
  margin-bottom: 1.2rem;
}

.markdown-content code {
  background-color: var(--neutral-100);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 0.9em;
  color: var(--error-red);
  border: 1px solid var(--border-light);
}

.markdown-content pre {
  background-color: var(--neutral-800);
  color: #f8f8f2;
  padding: 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border-light);
}

.markdown-content pre code {
  background-color: transparent;
  color: inherit;
  padding: 0;
  border: none;
  font-size: 0.9rem;
}

.markdown-content blockquote {
  border-left: 4px solid var(--primary-blue-light);
  padding-left: 1rem;
  margin: 1.5rem 0;
  background-color: var(--neutral-50);
  color: var(--text-secondary);
  font-style: italic;
}

.markdown-content ul,
.markdown-content ol {
  padding-left: 2rem;
  margin-bottom: 1.2rem;
}

.markdown-content li {
  margin-bottom: 0.5rem;
}

.markdown-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: var(--background-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px var(--shadow-light);
}

.markdown-content th,
.markdown-content td {
  padding: 0.8rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

.markdown-content th {
  background-color: var(--primary-blue);
  color: white;
  font-weight: 600;
}

.markdown-content tr:hover {
  background-color: var(--neutral-50);
}

/* Mermaid 图表样式 */
.mermaid-chart {
  background-color: var(--background-white);
  border: 2px solid var(--border-light);
  border-radius: 12px;
  padding: 2rem;
  margin: 2rem 0;
  text-align: center;
  box-shadow: 0 4px 15px var(--shadow-light);
  transition: all 0.3s ease;
  position: relative;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mermaid-chart:hover {
  box-shadow: 0 6px 25px var(--shadow-medium);
  transform: translateY(-2px);
}

.mermaid-chart svg {
  max-width: 100% !important;
  height: auto !important;
  display: block;
  margin: 0 auto;
}

/* Mermaid 图表主题颜色覆盖 */
.mermaid-chart .node rect,
.mermaid-chart .node circle,
.mermaid-chart .node ellipse,
.mermaid-chart .node polygon {
  fill: var(--primary-blue-light) !important;
  stroke: var(--primary-blue) !important;
  stroke-width: 2px !important;
}

.mermaid-chart .node .label {
  color: white !important;
  font-weight: 600 !important;
}

.mermaid-chart .edgePath .path {
  stroke: var(--primary-blue) !important;
  stroke-width: 2px !important;
}

.mermaid-chart .arrowheadPath {
  fill: var(--primary-blue) !important;
  stroke: var(--primary-blue) !important;
}

/* Mermaid 加载和错误状态 */
.mermaid-chart.loading {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

.mermaid-chart.loading::before {
  content: "正在渲染图表...";
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.mermaid-chart.error {
  background-color: #fef2f2;
  border-color: var(--error-red);
  color: var(--error-red);
}

.mermaid-chart.error::before {
  content: "图表渲染失败，请检查语法";
  font-size: 0.9rem;
}

@keyframes loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* 预览模式下的 Mermaid 样式 */
.markdown-preview .mermaid-chart,
#tech-markdown-preview .mermaid-chart,
#markdown-preview .mermaid-chart {
  margin: 1rem 0;
  padding: 1rem;
  min-height: 150px;
  background-color: #f8f9fa;
  border: 1px solid #dee2e6;
}

/* 防止下拉菜单造成页面横向滚动的额外保护 */
.navbar .dropdown-menu {
  /* 确保下拉菜单不会超出视口 */
  max-width: calc(100vw - 30px);
  /* 防止菜单超出屏幕右边界 */
  right: 0;
  left: auto;
}

/* 当导航栏在小屏幕上折叠时的特殊处理 */
@media (max-width: 991.98px) {
  .navbar-collapse .dropdown-menu-multi-column {
    position: static !important;
    float: none !important;
    width: 100% !important;
    margin-top: 0;
    background: transparent;
    border: none;
    box-shadow: none;
    max-width: none !important;
    min-width: auto !important;
  }
  
  .navbar-collapse .dropdown-menu-container {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .navbar-collapse .dropdown-column {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
  }
  
  .navbar-collapse .dropdown-column .dropdown-header {
    color: rgba(255, 255, 255, 0.9);
    border-bottom-color: rgba(255, 255, 255, 0.3);
  }
  
  .navbar-collapse .dropdown-column .dropdown-item {
    color: rgba(255, 255, 255, 0.8);
  }
  
  .navbar-collapse .dropdown-column .dropdown-item:hover {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
  }
}

/* 确保页面主体不会出现横向滚动 */
body {
  overflow-x: hidden;
}

.container, .container-fluid {
  overflow-x: visible;
}

/* 防止导航栏内容溢出 */
.navbar-brand {
  max-width: calc(100vw - 200px);
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (max-width: 576px) {
  .navbar-brand {
    max-width: calc(100vw - 100px);
    font-size: 1rem;
  }
}