:root {
  --primary: #2c5aa0;
  --primary-dark: #1e3d6f;
  --secondary: #28a745;
  --success: #28a745;
  --info: #17a2b8;
  --warning: #ffc107;
  --danger: #dc3545;
  --light: #f8f9fa;
  --dark: #343a40;
  --bg: #f5f7fa;
  --text: #2c3e50;
  --text-muted: #6c757d;
  --border: #e9ecef;
  --shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
  --border-radius: 0.375rem;
  --border-radius-lg: 0.5rem;
  --transition: all 0.15s ease-in-out;
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 0.875rem;
}

/* Professional Header */
.navbar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  box-shadow: var(--shadow);
  border: none;
  padding: 0.75rem 0;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: white !important;
  text-decoration: none;
}

.navbar-brand:hover {
  color: rgba(255, 255, 255, 0.9) !important;
}

.navbar-nav .nav-link {
  color: rgba(255, 255, 255, 0.9) !important;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  transition: var(--transition);
  margin: 0 0.25rem;
}

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

.navbar-nav .dropdown-menu {
  border: none;
  box-shadow: var(--shadow-lg);
  border-radius: var(--border-radius-lg);
  margin-top: 0.5rem;
}

.navbar-nav .dropdown-item {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  transition: var(--transition);
}

.navbar-nav .dropdown-item:hover {
  background: var(--light);
  color: var(--primary);
}

/* Professional Cards */
.card {
  border: 1px solid var(--border);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  transition: var(--transition);
  background: white;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header {
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  color: var(--text);
  padding: 1rem 1.25rem;
}

.card-body {
  padding: 1.25rem;
}

/* Professional Buttons */
.btn {
  font-weight: 500;
  border-radius: var(--border-radius);
  transition: var(--transition);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border: none;
  box-shadow: 0 2px 4px rgba(44, 90, 160, 0.2);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, #1a2f5a 100%);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(44, 90, 160, 0.3);
}

.btn-success {
  background: linear-gradient(135deg, var(--success) 0%, #1e7e34 100%);
  border: none;
}

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

.btn-outline-primary:hover {
  background: var(--primary);
  border-color: var(--primary);
}

/* Professional Tables */
.table {
  background: white;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.table thead th {
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border: none;
  font-weight: 600;
  color: var(--text);
  padding: 1rem 0.75rem;
  font-size: 0.875rem;
}

.table tbody td {
  padding: 0.75rem;
  border-color: var(--border);
  vertical-align: middle;
}

.table tbody tr:hover {
  background: rgba(44, 90, 160, 0.05);
}

/* Professional Forms */
.form-control {
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 0.2rem rgba(44, 90, 160, 0.25);
}

.form-label {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}

/* Professional Alerts */
.alert {
  border: none;
  border-radius: var(--border-radius);
  font-weight: 500;
  padding: 0.75rem 1rem;
}

.alert-success {
  background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
  color: #155724;
}

.alert-danger {
  background: linear-gradient(135deg, #f8d7da 0%, #f5c6cb 100%);
  color: #721c24;
}

.alert-warning {
  background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
  color: #856404;
}

/* Professional Stats Cards */
.stats-card {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-left: 4px solid var(--primary);
}

.stats-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.stats-card .stats-icon {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.stats-card .stats-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.stats-card .stats-label {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
}

/* Professional Sidebar */
.sidebar {
  background: white;
  min-height: 100vh;
  box-shadow: 2px 0 4px rgba(0, 0, 0, 0.1);
  border-right: 1px solid var(--border);
}

.sidebar .nav-link {
  color: var(--text-muted);
  padding: 0.75rem 1.25rem;
  border-radius: 0;
  transition: var(--transition);
  border-left: 3px solid transparent;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
  background: rgba(44, 90, 160, 0.1);
  color: var(--primary);
  border-left-color: var(--primary);
}

.sidebar .nav-link i {
  width: 1.25rem;
  margin-right: 0.75rem;
}

/* Professional Main Content */
.main-content {
  background: var(--bg);
  min-height: 100vh;
  padding: 2rem;
}

/* Professional Page Header */
.page-header {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: 1.5rem 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
}

.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.page-subtitle {
  color: var(--text-muted);
  margin: 0.5rem 0 0 0;
  font-size: 1rem;
}

/* Professional Data Tables */
.data-table {
  background: white;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.data-table .table {
  margin: 0;
}

.data-table .table thead th {
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border: none;
  font-weight: 600;
  color: var(--text);
  padding: 1rem 0.75rem;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Professional Badges */
.badge {
  font-weight: 500;
  padding: 0.375rem 0.75rem;
  border-radius: var(--border-radius);
  font-size: 0.75rem;
}

/* Professional Modals */
.modal-content {
  border: none;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

.modal-header {
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border-bottom: 1px solid var(--border);
  border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

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

/* Professional Dropdowns */
.dropdown-menu {
  border: none;
  box-shadow: var(--shadow-lg);
  border-radius: var(--border-radius-lg);
  padding: 0.5rem 0;
}

.dropdown-item {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  transition: var(--transition);
}

.dropdown-item:hover {
  background: rgba(44, 90, 160, 0.1);
  color: var(--primary);
}

/* Professional Progress Bars */
.progress {
  height: 0.5rem;
  border-radius: var(--border-radius);
  background: var(--border);
}

.progress-bar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: var(--border-radius);
}

/* Professional Pagination */
.pagination .page-link {
  border: 1px solid var(--border);
  color: var(--primary);
  padding: 0.5rem 0.75rem;
  margin: 0 0.125rem;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.pagination .page-link:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

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

/* Professional Loading States */
.loading {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border: 2px solid var(--border);
  border-radius: 50%;
  border-top-color: var(--primary);
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Professional Responsive Design */
@media (max-width: 768px) {
  .main-content {
    padding: 1rem;
  }
  
  .page-header {
    padding: 1rem;
    margin-bottom: 1rem;
  }
  
  .stats-card {
    margin-bottom: 1rem;
  }
  
  .navbar-nav .nav-link {
    padding: 0.5rem 0.75rem;
    margin: 0.125rem 0;
  }
}

/* Professional Animations */
.fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.slide-in {
  animation: slideIn 0.3s ease-in-out;
}

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

/* Professional Utilities */
.text-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.bg-gradient-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.bg-gradient-success {
  background: linear-gradient(135deg, var(--success) 0%, #1e7e34 100%);
}

.bg-gradient-info {
  background: linear-gradient(135deg, var(--info) 0%, #117a8b 100%);
}

.bg-gradient-warning {
  background: linear-gradient(135deg, var(--warning) 0%, #e0a800 100%);
}

.bg-gradient-danger {
  background: linear-gradient(135deg, var(--danger) 0%, #c82333 100%);
}