/* ===========================================================
   现代化导航栏设计 - 优化版
   与首页风格保持一致，性能优化，结构清晰
   ========================================================= */

/* ===========================================================
   1. CSS变量定义
   ========================================================= */

:root {
  /* 导航栏颜色 */
  --navbar-bg: rgba(255, 255, 255, 0.95);
  --navbar-bg-scrolled: rgba(255, 255, 255, 0.98);
  --navbar-border: rgba(255, 255, 255, 0.2);
  --navbar-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  --navbar-shadow-scrolled: 0 4px 20px rgba(0, 0, 0, 0.08);
  
  /* 品牌颜色 */
  --brand-primary: #667eea;
  --brand-secondary: #764ba2;
  --brand-success: #43e97b;
  --brand-info: #38f9d7;
  
  /* 文字颜色 */
  --text-primary: #2c3e50;
  --text-muted: #6c757d;
  
  /* 间距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1rem;
  --spacing-xl: 0.2rem;
  --spacing-2xl: 1.5rem;
  
  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  /* 动画 */
  --transition-fast: all 0.2s ease;
  --transition-base: all 0.3s ease;
  --transition-slow: all 0.5s ease;
  --transition-bezier: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===========================================================
   2. 导航栏基础样式
   ========================================================= */

.navbar-modern {
  background: var(--navbar-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--navbar-border);
  box-shadow: var(--navbar-shadow);
  transition: var(--transition-bezier);
  padding: var(--spacing-sm) 0;
  position: relative;
  z-index: 1030;
}

.navbar-modern.scrolled {
  background: var(--navbar-bg-scrolled);
  box-shadow: var(--navbar-shadow-scrolled);
  padding: var(--spacing-xs) 0;
}

/* ===========================================================
   3. 品牌Logo设计
   ========================================================= */

.navbar-brand-modern {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--brand-primary);
  text-decoration: none;
  transition: var(--transition-base);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  position: relative;
  overflow: visible;
  min-width: 180px;
  flex-shrink: 0;
}

.navbar-brand-modern::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
  transition: var(--transition-slow);
  z-index: -1;
}

.navbar-brand-modern:hover {
  transform: translateY(-2px);
  color: var(--brand-secondary);
}

.navbar-brand-modern:hover::before {
  left: 100%;
}

/* 品牌文字渐变效果 */
.navbar-brand-modern span {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: var(--transition-base);
}

.navbar-brand-modern:hover span {
  background: linear-gradient(135deg, var(--brand-secondary) 0%, var(--brand-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-brand-icon {
  font-size: 1.8rem;
  color: var(--brand-primary);
  transition: var(--transition-base);
}

.navbar-brand-modern:hover .navbar-brand-icon {
  transform: rotate(15deg) scale(1.1);
}

/* ===========================================================
   4. 导航链接设计
   ========================================================= */

.nav-link-modern {
  color: var(--text-primary) !important;
  font-weight: 600;
  font-size: 0.9rem;
  padding: var(--spacing-sm) var(--spacing-xs) !important;
  margin: 0 2px !important;
  border-radius: var(--radius-md);
  transition: var(--transition-bezier);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  white-space: nowrap;
  text-overflow: ellipsis;
}

.nav-link-modern::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
  transition: var(--transition-slow);
}

.nav-link-modern:hover {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  color: var(--brand-primary) !important;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(102, 126, 234, 0.2);
}

.nav-link-modern:hover::before {
  left: 100%;
}

.nav-link-modern.active {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
  color: white !important;
  box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.nav-link-icon {
  font-size: 1.1rem;
  transition: var(--transition-base);
}

.nav-link-modern:hover .nav-link-icon {
  transform: scale(1.2);
}

/* ===========================================================
   5. 图标修复 - 确保所有图标正常显示
   ========================================================= */

/* 通用图标样式 */
.bi {
  display: inline-block !important;
  visibility: visible !important;
  opacity: 1 !important;
  font-family: "bootstrap-icons" !important;
  font-style: normal !important;
  font-weight: normal !important;
  font-variant: normal !important;
  text-transform: none !important;
  line-height: 1 !important;
  -webkit-font-smoothing: antialiased !important;
  -moz-osx-font-smoothing: grayscale !important;
}

/* 数据库图标特殊修复 */
.bi-database::before {
  content: "\F2C0" !important;
}

/* 备用方案：通过href属性确保图标显示 */
.nav-link-modern[href*="database"] .nav-link-icon::before {
  content: "\F2C0" !important;
}

/* ===========================================================
   6. 右侧功能按钮
   ========================================================= */

.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.action-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: rgba(102, 126, 234, 0.1);
  border: none;
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition-bezier);
  position: relative;
  overflow: hidden;
}

.action-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: var(--transition-slow);
}

.action-btn:hover {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
  color: white;
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 12px 25px rgba(102, 126, 234, 0.4);
}

.action-btn:hover::before {
  left: 100%;
}

.action-btn.search-btn {
  background: linear-gradient(135deg, var(--brand-success) 0%, var(--brand-info) 100%);
  color: white;
}

.action-btn.search-btn:hover {
  background: linear-gradient(135deg, var(--brand-info) 0%, var(--brand-success) 100%);
  transform: translateY(-3px) scale(1.05) rotate(5deg);
}

/* ===========================================================
   7. 汉堡菜单按钮
   ========================================================= */

.navbar-toggler-modern {
  border: none;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  background: rgba(102, 126, 234, 0.1);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.navbar-toggler-modern:hover {
  background: rgba(102, 126, 234, 0.2);
  transform: scale(1.05);
}

.navbar-toggler-modern:focus {
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.25);
}

.navbar-toggler-icon-modern {
  width: 24px;
  height: 2px;
  background: var(--brand-primary);
  position: relative;
  transition: var(--transition-base);
}

.navbar-toggler-icon-modern::before,
.navbar-toggler-icon-modern::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--brand-primary);
  transition: var(--transition-base);
}

.navbar-toggler-icon-modern::before {
  top: -8px;
}

.navbar-toggler-icon-modern::after {
  bottom: -8px;
}

.navbar-toggler-modern[aria-expanded="true"] .navbar-toggler-icon-modern {
  background: transparent;
}

.navbar-toggler-modern[aria-expanded="true"] .navbar-toggler-icon-modern::before {
  transform: rotate(45deg);
  top: 0;
}

.navbar-toggler-modern[aria-expanded="true"] .navbar-toggler-icon-modern::after {
  transform: rotate(-45deg);
  bottom: 0;
}

/* ===========================================================
   8. 移动端折叠菜单和导航优化
   ========================================================= */

.navbar-collapse-modern {
  background: var(--navbar-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  margin-top: var(--spacing-lg);
  padding: var(--spacing-2xl);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  border: 1px solid var(--navbar-border);
}

/* 确保导航菜单有足够空间 */
.navbar-nav {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  max-width: 75%;
  overflow: hidden;
}

/* 防止导航菜单在小屏幕上过度压缩 */
@media (min-width: 992px) {
  .navbar-nav {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  
  .navbar-nav::-webkit-scrollbar {
    display: none;
  }
}

/* 特殊处理较长的导航文本 */
@media (max-width: 1199.98px) and (min-width: 992px) {
  .nav-link-modern {
    font-size: 0.85rem;
    padding: var(--spacing-xs) 2px !important;
    margin: 0 1px !important;
  }
  
  .nav-link-icon {
    font-size: 1rem;
  }
}

/* 超宽屏幕下的优化 */
@media (min-width: 1400px) {
  .nav-link-modern {
    font-size: 1rem;
    padding: var(--spacing-sm) var(--spacing-sm) !important;
    margin: 0 var(--spacing-xs) !important;
  }
  
  .nav-link-icon {
    font-size: 1.2rem;
  }
}

.mobile-nav-link {
  color: var(--text-primary);
  font-weight: 600;
  padding: var(--spacing-lg) var(--spacing-2xl);
  border-radius: var(--radius-md);
  margin: var(--spacing-sm) 0;
  transition: var(--transition-base);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: rgba(102, 126, 234, 0.05);
}

.mobile-nav-link:hover {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  color: var(--brand-primary);
  transform: translateX(10px);
}

.mobile-actions {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-2xl);
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
}

.mobile-action-btn {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  border: none;
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  transition: var(--transition-base);
}

.mobile-action-btn:hover {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
  color: white;
  transform: translateY(-3px) scale(1.1);
}

/* ===========================================================
   9. 动画效果
   ========================================================= */

@keyframes navFadeIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.navbar-modern {
  animation: navFadeIn 0.6s ease-out;
}

.nav-link-modern {
  animation: navFadeIn 0.6s ease-out;
}

/* 导航链接动画延迟 */
.nav-link-modern:nth-child(1) { animation-delay: 0.1s; }
.nav-link-modern:nth-child(2) { animation-delay: 0.2s; }
.nav-link-modern:nth-child(3) { animation-delay: 0.3s; }
.nav-link-modern:nth-child(4) { animation-delay: 0.4s; }
.nav-link-modern:nth-child(5) { animation-delay: 0.5s; }
.nav-link-modern:nth-child(6) { animation-delay: 0.6s; }

/* ===========================================================
   10. 特殊效果
   ========================================================= */

.navbar-modern::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.3), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.navbar-modern:hover::before {
  opacity: 1;
}

/* ===========================================================
   11. 响应式设计
   ========================================================= */

@media (max-width: 991.98px) {
  .navbar-modern {
    padding: var(--spacing-xs) 0;
  }
  
  .navbar-brand-modern {
    font-size: 1.3rem;
    min-width: 150px;
  }
  
  .action-btn {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }
  
  .mobile-nav-link {
    font-size: 1.1rem;
  }
}

@media (max-width: 767.98px) {
  .navbar-modern {
    padding: var(--spacing-xs) 0;
  }
  
  .navbar-brand-modern {
    font-size: 1.2rem;
    min-width: 120px;
  }
  
  .action-btn {
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
  }
  
  .mobile-action-btn {
    width: 48px;
    height: 48px;
    font-size: 1.2rem;
  }
}

/* ===========================================================
   12. 无障碍支持
   ========================================================= */

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
  .navbar-modern,
  .nav-link-modern,
  .action-btn,
  .navbar-brand-modern {
    animation: none !important;
    transition: none !important;
  }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  .navbar-modern {
    background: white;
    border-bottom: 2px solid black;
  }
  
  .nav-link-modern {
    color: black !important;
  }
  
  .navbar-brand-modern {
    color: black;
  }
}

/* ===========================================================
   13. 深色主题支持
   ========================================================= */

[data-theme="dark"] {
  /* 深色主题导航栏变量 */
  --navbar-bg: rgba(24, 28, 36, 0.95);
  --navbar-bg-scrolled: rgba(24, 28, 36, 0.98);
  --navbar-border: rgba(127, 255, 167, 0.2);
  --navbar-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --navbar-shadow-scrolled: 0 4px 20px rgba(0, 0, 0, 0.3);
  --text-primary: #e0e6ed;
  --text-muted: #a0aec0;
  --brand-primary: #7fffa7;
  --brand-secondary: #64d983;
}

[data-theme="dark"] .navbar-modern {
  background: var(--navbar-bg);
  border-bottom: 1px solid var(--navbar-border);
  box-shadow: var(--navbar-shadow);
}

[data-theme="dark"] .navbar-modern.scrolled {
  background: var(--navbar-bg-scrolled);
  box-shadow: var(--navbar-shadow-scrolled);
}

[data-theme="dark"] .nav-link-modern {
  color: var(--text-primary) !important;
}

[data-theme="dark"] .nav-link-modern:hover {
  color: var(--brand-primary) !important;
  background: rgba(127, 255, 167, 0.1) !important;
}

[data-theme="dark"] .navbar-brand-modern {
  color: var(--brand-primary);
}

[data-theme="dark"] .navbar-brand-modern span {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="dark"] .navbar-brand-icon {
  color: var(--brand-primary);
}

[data-theme="dark"] .action-btn {
  color: var(--text-primary) !important;
  background: rgba(127, 255, 167, 0.1) !important;
  border: 1px solid rgba(127, 255, 167, 0.2) !important;
}

[data-theme="dark"] .action-btn:hover {
  background: rgba(127, 255, 167, 0.2) !important;
  color: var(--brand-primary) !important;
  transform: translateY(-2px);
}

[data-theme="dark"] .mobile-action-btn {
  color: var(--text-primary) !important;
  background: rgba(127, 255, 167, 0.1) !important;
}

[data-theme="dark"] .mobile-action-btn:hover {
  background: rgba(127, 255, 167, 0.2) !important;
  color: var(--brand-primary) !important;
}