/* Bootstrap 增强样式 */
:root {
  --primary-color: #3E9EFF;
  --secondary-color: #26d0ce;
  --accent-color: #ff6b6b;
  --light-color: #f8f9fa;
  --dark-color: #343a40;
  --success-color: #28a745;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  --info-color: #17a2b8;
  
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 1rem;
  
  --box-shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  --box-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
}

/* 主体样式 */
body {
  font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: #f5f7fa;
  color: #333;
  margin: 0;
  padding: 0;
}

/* 导航栏增强 */
.navbar {
  box-shadow: var(--box-shadow);
  background: linear-gradient(135deg, #ffffff, #f0f2f5);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.navbar-brand {
  font-weight: 700;
  color: var(--primary-color) !important;
  font-size: 1.5rem;
}

.nav-link {
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--primary-color) !important;
}

.nav-link:hover::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--primary-color);
  border-radius: 3px;
}

.nav-link.active {
  color: var(--primary-color) !important;
}

/* 卡片样式增强 */
.card {
  border: none;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--box-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-lg);
}

.card-header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  font-weight: 600;
  border-bottom: none;
  padding: 1rem 1.5rem;
}

.card-body {
  padding: 1.5rem;
}

/* 按钮样式增强 */
.btn {
  border-radius: var(--border-radius-md);
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  transition: all 0.3s ease;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), #2d7be6);
  color: white;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #2d7be6, var(--primary-color));
  transform: translateY(-2px);
  box-shadow: var(--box-shadow);
}

.btn-success {
  background: linear-gradient(135deg, var(--success-color), #218838);
}

.btn-success:hover {
  background: linear-gradient(135deg, #218838, var(--success-color));
  transform: translateY(-2px);
  box-shadow: var(--box-shadow);
}

.btn-outline-primary {
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline-primary:hover {
  background: linear-gradient(135deg, var(--primary-color), #2d7be6);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--box-shadow);
}

/* 表单控件增强 */
.form-control {
  border-radius: var(--border-radius-md);
  border: 2px solid #e1e5eb;
  padding: 0.75rem 1rem;
  transition: all 0.3s ease;
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(62, 158, 255, 0.25);
}

.form-select {
  border-radius: var(--border-radius-md);
  border: 2px solid #e1e5eb;
  padding: 0.75rem 1rem;
}

.form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(62, 158, 255, 0.25);
}

/* 模态框增强 */
.modal-content {
  border-radius: var(--border-radius-lg);
  border: none;
  box-shadow: var(--box-shadow-lg);
}

.modal-header {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-bottom: 1px solid #e1e5eb;
  padding: 1rem 1.5rem;
}

.modal-title {
  font-weight: 600;
  color: var(--dark-color);
}

.modal-footer {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-top: 1px solid #e1e5eb;
  padding: 1rem 1.5rem;
}

/* 警告框增强 */
.alert {
  border-radius: var(--border-radius-md);
  border: none;
  font-weight: 500;
  box-shadow: var(--box-shadow-sm);
}

.alert-warning {
  background: linear-gradient(135deg, #fff3cd, #ffeaa7);
  color: #856404;
}

.alert-info {
  background: linear-gradient(135deg, #d1ecf1, #a8e6ff);
  color: #0c5460;
}

/* 徽章增强 */
.badge {
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  padding: 0.5em 0.75em;
}

.badge-primary {
  background: linear-gradient(135deg, var(--primary-color), #2d7be6);
}

/* 分页增强 */
.pagination .page-link {
  border-radius: var(--border-radius-md);
  border: none;
  margin: 0 0.25rem;
  color: var(--primary-color);
  font-weight: 500;
  transition: all 0.3s ease;
}

.pagination .page-link:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

.pagination .active .page-link {
  background: linear-gradient(135deg, var(--primary-color), #2d7be6);
  color: white;
  box-shadow: var(--box-shadow-sm);
}

/* 进度条增强 */
.progress {
  border-radius: var(--border-radius-sm);
  height: 1rem;
  background-color: #e1e5eb;
  box-shadow: inset 0 0.1rem 0.1rem rgba(0, 0, 0, 0.1);
}

.progress-bar {
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

/* 表格增强 */
.table {
  box-shadow: var(--box-shadow-sm);
  border-radius: var(--border-radius-md);
  overflow: hidden;
}

.table thead th {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-bottom: 2px solid #dee2e6;
  font-weight: 600;
}

/* 工具提示增强 */
.tooltip .tooltip-inner {
  border-radius: var(--border-radius-sm);
  padding: 0.5rem 1rem;
  background-color: var(--dark-color);
  color: white;
  box-shadow: var(--box-shadow);
}

/* 弹出框增强 */
.popover {
  border-radius: var(--border-radius-md);
  border: none;
  box-shadow: var(--box-shadow);
}

.popover-header {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-bottom: 1px solid #e1e5eb;
  border-top-left-radius: calc(var(--border-radius-md) - 1px);
  border-top-right-radius: calc(var(--border-radius-md) - 1px);
  font-weight: 600;
}

/* 下拉菜单增强 */
.dropdown-menu {
  border-radius: var(--border-radius-md);
  border: none;
  box-shadow: var(--box-shadow);
  padding: 0.5rem 0;
}

.dropdown-item {
  padding: 0.5rem 1.5rem;
  transition: all 0.2s ease;
}

.dropdown-item:hover {
  background: linear-gradient(90deg, var(--primary-color), #2d7be6);
  color: white;
}

/* 面包屑增强 */
.breadcrumb {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-radius: var(--border-radius-md);
  padding: 1rem 1.5rem;
}

.breadcrumb-item a {
  color: var(--primary-color);
  font-weight: 500;
  text-decoration: none;
}

.breadcrumb-item a:hover {
  color: #2d7be6;
  text-decoration: underline;
}

/* 列表组增强 */
.list-group-item {
  border: 1px solid rgba(0, 0, 0, 0.125);
  transition: all 0.3s ease;
}

.list-group-item:first-child {
  border-top-left-radius: var(--border-radius-md);
  border-top-right-radius: var(--border-radius-md);
}

.list-group-item:last-child {
  border-bottom-left-radius: var(--border-radius-md);
  border-bottom-right-radius: var(--border-radius-md);
}

.list-group-item:hover {
  background: linear-gradient(90deg, #f8f9fa, #e9ecef);
  transform: translateX(5px);
}

.list-group-item.active {
  background: linear-gradient(90deg, var(--primary-color), #2d7be6);
  border-color: var(--primary-color);
}

/* 背景色工具类增强 */
.bg-gradient-primary {
  background: linear-gradient(135deg, var(--primary-color), #2d7be6) !important;
}

.bg-gradient-secondary {
  background: linear-gradient(135deg, var(--secondary-color), #1fb6b0) !important;
}

.bg-gradient-success {
  background: linear-gradient(135deg, var(--success-color), #218838) !important;
}

.bg-gradient-danger {
  background: linear-gradient(135deg, var(--danger-color), #c82333) !important;
}

.bg-gradient-warning {
  background: linear-gradient(135deg, var(--warning-color), #e0a800) !important;
}

.bg-gradient-info {
  background: linear-gradient(135deg, var(--info-color), #138496) !important;
}

/* 文字颜色工具类增强 */
.text-primary {
  color: var(--primary-color) !important;
}

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

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

/* 边框工具类增强 */
.border-primary {
  border-color: var(--primary-color) !important;
}

.border-secondary {
  border-color: var(--secondary-color) !important;
}

.border-accent {
  border-color: var(--accent-color) !important;
}

/* 阴影工具类增强 */
.shadow-sm {
  box-shadow: var(--box-shadow-sm) !important;
}

.shadow {
  box-shadow: var(--box-shadow) !important;
}

.shadow-lg {
  box-shadow: var(--box-shadow-lg) !important;
}

/* 圆角工具类增强 */
.rounded-sm {
  border-radius: var(--border-radius-sm) !important;
}

.rounded {
  border-radius: var(--border-radius-md) !important;
}

.rounded-lg {
  border-radius: var(--border-radius-lg) !important;
}

/* 动画增强 */
.fade-in {
  animation: fadeIn 0.5s ease-in-out;
}

.slide-in-top {
  animation: slideInTop 0.5s ease-out;
}

.slide-in-bottom {
  animation: slideInBottom 0.5s ease-out;
}

.slide-in-left {
  animation: slideInLeft 0.5s ease-out;
}

.slide-in-right {
  animation: slideInRight 0.5s ease-out;
}

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

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

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

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

@keyframes slideInRight {
  from {
    transform: translateX(20px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* 响应式增强 */
@media (max-width: 768px) {
  .card {
    margin-bottom: 1rem;
  }
  
  .btn {
    padding: 0.5rem 1rem;
  }
  
  .form-control,
  .form-select {
    padding: 0.625rem 0.875rem;
  }
  
  .modal-dialog {
    margin: 1rem;
  }
  
  .table-responsive {
    font-size: 0.875rem;
  }
}

@media (max-width: 576px) {
  .card {
    margin-bottom: 0.75rem;
  }
  
  .btn {
    padding: 0.4rem 0.875rem;
    font-size: 0.875rem;
  }
  
  .form-control,
  .form-select {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
  }
  
  .alert {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
  }
  
  .badge {
    font-size: 0.75rem;
  }
}