/* Minimalist Dashboard Styles */
 :root {
     --sidebar-width: 280px;
     --sidebar-collapsed-width: 70px;
     --primary-color: #3a7bd5;
     --primary-gradient: linear-gradient(to right, #8cc166 0%, #0d757a 100%);
     --secondary-color: #6a11cb;
     --secondary-gradient: linear-gradient(45deg, var(--primary-color), #007bff);
     --accent-color: #04921c;
     --accent-hover: #FF5252;
     --accent-secondary: #4ECDC4;
     --bg-color-gradient: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
     --bg-color-button: linear-gradient();
     --dark-color: #2C3E50;
     --light-color: #f8f9fa;
     --section-title: linear-gradient(135deg, #0a3a81, #489df1);
     --warning-color: #FFD93D;
     --danger-color: #FF6B6B;
     --success-color: #6BCF7F;
     --text-color: #2C3E50;
     --text-light: #7b92a9;
     --text-white: #ffffff;
     --text-secondary: black;
     --shadow-color: rgba(0, 0, 0, 0.15);
     --overlay-color: rgba(42, 62, 80, 0.9);
     --transition-speed: 0.4s;
     --border-radius: 20px;
     --glass-bg: rgba(179, 255, 0, 0.1);
     --glass-border: rgba(255, 255, 255, 0.18);
     --white: #ffffff;
     --gradient-primary: linear-gradient(135deg, #036865 0%, #0d757a 50%, #4ECDC4 100%);
     --transition-speed: 0.3s;
 }

 * {
     margin: 0;
     padding: 0;
     box-sizing: border-box;
 }

 body {
     font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
     background-color: var(--background-color);
     color: var(--text-primary);
     line-height: 1.6;
 }

 .section-title {
     color: var(--primary-color);
     font-weight: 800;
     font-size: 2.5rem;
     margin-bottom: 0.5rem;
     position: relative;
     display: inline-block;
 }

 .section-title:after {
     content: '';
     position: absolute;
     width: 60%;
     height: 4px;
     color: var(--section-title);
     bottom: -10px;
     left: 20%;
     border-radius: 2px;
 }

 .gradient-text {
     background: var(--section-title);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
     background-clip: text;
     font-size: clamp(2rem, 5vw, 2.5rem);
     font-weight: 700;
     line-height: 1.2;
     text-align: center;
     margin-bottom: var(--spacing-xl);
 }

 .dashboard-layout {
     display: flex;
     min-height: 100vh;
     margin-top: 120px;
 }

 /* Sidebar Styles */
 .sidebar {
     width: var(--sidebar-width);
     background: var(--surface-color);
     border-right: 1px solid var(--border-color);
     display: flex;
     flex-direction: column;
     position: absolute;
     height: 90vh;
     left: 0;
     top: 0;
     z-index: 1000;
     transition: all 0.3s ease;
     margin-top: 120px;
 }

 .sidebar.collapsed {
     width: var(--sidebar-collapsed-width);
 }

 .sidebar-header {
     padding: 1rem;
     border-bottom: 1px solid var(--border-color);
     display: flex;
     align-items: center;
     justify-content: space-between;
     min-height: 70px;
 }

 .sidebar-brand {
     display: flex;
     align-items: center;
     gap: 0.75rem;
     color: var(--primary-color);
     font-weight: 600;
     font-size: 1.1rem;
 }

 .sidebar-brand i {
     font-size: 1.5rem;
 }

 .sidebar-toggle {
     background: none;
     border: none;
     color: var(--text-secondary);
     cursor: pointer;
     padding: 0.5rem;
     border-radius: 6px;
     transition: all 0.2s ease;
 }

 .sidebar-toggle:hover {
     background-color: var(--border-color);
 }

 .sidebar-content {
     flex: 1;
     overflow-y: auto;
     padding: 1rem;
 }

 .sidebar-stats {
     display: flex;
     flex-direction: column;
     gap: 0.75rem;
     margin-bottom: 1.5rem;
 }

 .stat-item {
     display: flex;
     align-items: center;
     gap: 0.75rem;
     padding: 0.75rem;
     background: var(--background-color);
     border-radius: 8px;
     border: 1px solid var(--border-color);
 }

 .stat-icon {
     width: 40px;
     height: 40px;
     border-radius: 6px;
     background: var(--primary-color);
     display: flex;
     align-items: center;
     justify-content: center;
     color: white;
     font-size: 1.2rem;
 }

 .stat-info {
     display: flex;
     flex-direction: column;
 }

 .stat-number {
     font-size: 1.25rem;
     font-weight: 600;
     color: var(--text-primary);
 }

 .stat-label {
     font-size: 0.875rem;
     color: var(--text-secondary);
 }

 .sidebar-search {
     margin-bottom: 1.5rem;
 }

 .search-wrapper {
     position: relative;
     display: flex;
     align-items: center;
 }

 .search-wrapper i {
     position: absolute;
     left: 1rem;
     color: var(--text-secondary);
     z-index: 1;
 }

 .search-wrapper input {
     width: 100%;
     padding: 0.75rem 1rem 0.75rem 2.5rem;
     border: 1px solid var(--border-color);
     border-radius: 8px;
     background: var(--surface-color);
     color: var(--text-primary);
     font-size: 0.875rem;
     transition: all 0.2s ease;
 }

 .search-wrapper input:focus {
     outline: none;
     border-color: var(--primary-color);
     box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
 }

 .search-clear {
     position: absolute;
     right: 0.75rem;
     background: none;
     border: none;
     color: var(--text-secondary);
     cursor: pointer;
     display: none;
     padding: 0.25rem;
     border-radius: 4px;
 }

 .search-clear:hover {
     color: var(--text-primary);
 }

 .nav-section {
     margin-bottom: 1.5rem;
 }

 .nav-title {
     font-size: 0.875rem;
     font-weight: 600;
     color: var(--text-secondary);
     margin-bottom: 0.75rem;
     text-transform: uppercase;
     letter-spacing: 0.025em;
 }

 .nav-list {
     display: flex;
     flex-direction: column;
     gap: 0.25rem;
 }

 .nav-item {
     display: flex;
     align-items: center;
     gap: 0.75rem;
     padding: 0.75rem;
     border-radius: 6px;
     cursor: pointer;
     transition: all 0.2s ease;
     color: var(--text-secondary);
     font-size: 0.875rem;
 }

 .nav-item.small {
     padding: 0.5rem 0.75rem;
     font-size: 0.8rem;
 }

 .nav-item:hover {
     background-color: var(--border-color);
     color: var(--text-primary);
 }

 .nav-item.active {
     background-color: var(--primary-color);
     color: white;
 }

 .nav-item i {
     width: 18px;
     text-align: center;
 }

 .nav-item span:first-of-type {
     flex: 1;
 }

 .nav-count {
     font-size: 0.75rem;
     padding: 0.25rem 0.5rem;
     background: rgba(255, 255, 255, 0.2);
     border-radius: 10px;
     font-weight: 500;
 }

 .nav-item.active .nav-count {
     background: rgba(255, 255, 255, 0.2);
 }

 .nav-item:not(.active) .nav-count {
     background: var(--border-color);
     color: var(--text-secondary);
 }

 /* Main Content Styles */
 .main-content {
     flex: 1;
     margin-left: var(--sidebar-width);
     display: flex;
     flex-direction: column;
     min-height: 100vh;
     transition: all 0.3s ease;
 }

 .sidebar.collapsed+.main-content {
     margin-left: var(--sidebar-collapsed-width);
 }

 .top-bar {
     max-height: 100px;
     border-bottom: 1px solid var(--border-color);
     padding: 1rem 1.5rem;
     display: flex;
     position: relative;
     align-items: left;
     justify-content: space-between;
 }

 .top-bar-left {
     display: flex;
     align-items: center;
     gap: 1rem;
 }

 .mobile-menu-btn {
     display: none;
     background: none;
     border: none;
     color: var(--text-secondary);
     cursor: pointer;
     padding: 0.5rem;
     border-radius: 6px;
 }

 .mobile-menu-btn:hover {
     background-color: var(--border-color);
 }

 .page-title h1 {
     font-size: 1.5rem;
     font-weight: 600;
     color: var(--text-primary);
     margin-bottom: 0.25rem;
 }

 .page-title p {
     font-size: 0.875rem;
     color: var(--text-secondary);
 }

 .top-bar-right {
     display: flex;
     align-items: center;
     gap: 1rem;
 }

 .view-options {
     display: flex;
     gap: 0.25rem;
     background: var(--background-color);
     border-radius: 6px;
     padding: 0.25rem;
 }

 .view-btn {
     padding: 0.5rem;
     background: none;
     border: none;
     color: var(--text-secondary);
     cursor: pointer;
     border-radius: 4px;
     transition: all 0.2s ease;
 }

 .view-btn.active {
     background: var(--surface-color);
     color: var(--primary-color);
     box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
 }

 .items-selector select {
     padding: 0.5rem 0.75rem;
     border: 1px solid var(--border-color);
     border-radius: 6px;
     background: var(--surface-color);
     color: var(--text-primary);
     font-size: 0.875rem;
     cursor: pointer;
 }

 .items-selector select:focus {
     outline: none;
     border-color: var(--primary-color);
 }

 /* Content Area */
 .content-area {
     flex: 1;
     padding: 1.5rem;
     overflow-y: auto;
 }

 .loading-state {
     display: none;
     text-align: center;
     padding: 3rem;
     color: var(--text-secondary);
 }

 .loading-spinner {
     width: 40px;
     height: 40px;
     border: 3px solid var(--border-color);
     border-top: 3px solid var(--primary-color);
     border-radius: 50%;
     animation: spin 1s linear infinite;
     margin: 0 auto 1rem;
 }

 @keyframes spin {
     0% {
         transform: rotate(0deg);
     }

     100% {
         transform: rotate(360deg);
     }
 }

 .theme-group {
     margin-bottom: 2rem;
 }

 .theme-header {
     display: flex;
     align-items: center;
     justify-content: space-between;
     margin-bottom: 1rem;
     padding-bottom: 0.75rem;
     border-bottom: 1px solid var(--border-color);
 }

 .theme-name {
     font-size: 1.25rem;
     font-weight: 600;
     color: var(--text-primary);
 }

 .theme-count {
     font-size: 0.875rem;
     color: var(--text-secondary);
     background: var(--background-color);
     padding: 0.25rem 0.75rem;
     border-radius: 12px;
 }

 .materials-grid {
     display: grid;
     grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
     gap: 1rem;
 }

 .material-card {
     background: var(--surface-color);
     border: 1px solid var(--border-color);
     border-radius: 8px;
     overflow: hidden;
     transition: all 0.2s ease;
     cursor: pointer;
 }

 .material-card:hover {
     transform: translateY(-2px);
     box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
     border-color: var(--primary-color);
 }

 .card-header {
     padding: 1rem;
     display: flex;
     align-items: center;
     justify-content: space-between;
     border-bottom: 1px solid var(--border-color);
 }

 .card-icon {
     width: 40px;
     height: 40px;
     border-radius: 6px;
     background: linear-gradient(135deg, var(--primary-color), #3b82f6);
     display: flex;
     align-items: center;
     justify-content: center;
     color: white;
     font-size: 1.2rem;
 }

 .status-badge {
     padding: 0.25rem 0.5rem;
     border-radius: 12px;
     font-size: 0.75rem;
     font-weight: 500;
     display: flex;
     align-items: center;
     gap: 0.25rem;
 }

 .status-badge.available {
     background: rgba(16, 185, 129, 0.1);
     color: var(--success-color);
 }

 .status-badge.unavailable {
     background: rgba(239, 68, 68, 0.1);
     color: var(--error-color);
 }

 .card-content {
     padding: 1rem;
 }

 .card-title {
     font-size: 1rem;
     font-weight: 600;
     color: var(--text-primary);
     margin-bottom: 0.5rem;
     line-height: 1.4;
 }

 .card-description {
     font-size: 0.875rem;
     color: var(--text-secondary);
     margin-bottom: 1rem;
     line-height: 1.5;
     display: -webkit-box;
     -webkit-line-clamp: 2;
     -webkit-box-orient: vertical;
     overflow: hidden;
 }

 .card-meta {
     display: flex;
     align-items: center;
     gap: 0.5rem;
 }

 .meta-theme {
     font-size: 0.75rem;
     color: var(--primary-color);
     background: rgba(37, 99, 235, 0.1);
     padding: 0.25rem 0.5rem;
     border-radius: 6px;
     font-weight: 500;
 }

 .card-actions {
     padding: 1rem;
     background: var(--background-color);
     border-top: 1px solid var(--border-color);
 }

 .btn-download {
     width: 100%;
     padding: 0.75rem;
     background: var(--primary-color);
     color: white;
     border: none;
     border-radius: 6px;
     font-weight: 500;
     cursor: pointer;
     transition: all 0.2s ease;
     display: flex;
     align-items: center;
     justify-content: center;
     gap: 0.5rem;
     font-size: 0.875rem;
 }

 .btn-download:hover {
     background: #1d4ed8;
     transform: translateY(-1px);
 }

 .btn-download.disabled {
     background: var(--text-secondary);
     cursor: not-allowed;
     opacity: 0.5;
 }

 .btn-download.disabled:hover {
     transform: none;
 }

 /* Empty State */
 .empty-state {
     display: none;
     text-align: center;
     padding: 3rem;
     color: var(--text-secondary);
 }

 .empty-icon {
     width: 80px;
     height: 80px;
     margin: 0 auto 1rem;
     background: var(--border-color);
     border-radius: 50%;
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 2rem;
 }

 .empty-state h3 {
     font-size: 1.25rem;
     margin-bottom: 0.5rem;
     color: var(--text-primary);
 }

 .empty-state p {
     margin-bottom: 1.5rem;
 }

 .btn-reset {
     padding: 0.75rem 1.5rem;
     background: var(--primary-color);
     color: white;
     border: none;
     border-radius: 6px;
     font-weight: 500;
     cursor: pointer;
     transition: all 0.2s ease;
     display: inline-flex;
     align-items: center;
     gap: 0.5rem;
 }

 .btn-reset:hover {
     background: #1d4ed8;
 }

 /* Pagination */
 .pagination-wrapper {
     display: flex;
     align-items: center;
     justify-content: space-between;
     margin-top: 2rem;
     padding-top: 1rem;
     border-top: 1px solid var(--border-color);
 }

 .pagination-info {
     font-size: 0.875rem;
     color: var(--text-secondary);
 }

 .pagination-controls {
     display: flex;
     align-items: center;
     gap: 0.5rem;
 }

 .pagination-btn {
     padding: 0.5rem 1rem;
     background: var(--surface-color);
     border: 1px solid var(--border-color);
     border-radius: 6px;
     color: var(--text-secondary);
     cursor: pointer;
     transition: all 0.2s ease;
     display: flex;
     align-items: center;
     gap: 0.5rem;
     font-size: 0.875rem;
 }

 .pagination-btn:hover:not(:disabled) {
     background: var(--border-color);
     color: var(--text-primary);
 }

 .pagination-btn:disabled {
     opacity: 0.5;
     cursor: not-allowed;
 }

 .pagination-numbers {
     display: flex;
     gap: 0.25rem;
 }

 .pagination-number {
     width: 40px;
     height: 40px;
     border: 1px solid var(--border-color);
     background: var(--surface-color);
     color: var(--text-secondary);
     border-radius: 6px;
     cursor: pointer;
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 0.875rem;
     transition: all 0.2s ease;
 }

 .pagination-number:hover {
     background: var(--border-color);
     color: var(--text-primary);
 }

 .pagination-number.active {
     background: var(--primary-color);
     color: white;
     border-color: var(--primary-color);
 }

 /* Responsive Design */
 @media (max-width: 768px) {
     .sidebar {
         transform: translateX(-100%);
         z-index: 1001;
     }

     .sidebar.open {
         transform: translateX(0);
     }

     .main-content {
         margin-left: 0;
     }

     .mobile-menu-btn {
         display: block;
     }

     .materials-grid {
         grid-template-columns: 1fr;
     }

     .top-bar {
         flex-direction: column;
         gap: 1rem;
         align-items: flex-start;
     }

     .top-bar-right {
         width: 100%;
         justify-content: space-between;
     }

     .pagination-wrapper {
         flex-direction: column;
         gap: 1rem;
     }
 }

 /* Notifications */
 .notification {
     position: fixed;
     top: 20px;
     right: 20px;
     min-width: 300px;
     max-width: 500px;
     padding: 1rem;
     border-radius: 8px;
     box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
     z-index: 9999;
     transform: translateX(400px);
     transition: transform 0.3s ease-in-out;
     font-family: inherit;
 }

 .notification.show {
     transform: translateX(0);
 }

 .notification-content {
     display: flex;
     align-items: center;
     gap: 0.75rem;
 }

 .notification-icon {
     font-size: 1.25rem;
     flex-shrink: 0;
 }

 .notification-message {
     flex: 1;
     font-size: 0.875rem;
     line-height: 1.5;
 }

 .notification-close {
     background: none;
     border: none;
     color: inherit;
     cursor: pointer;
     opacity: 0.7;
     padding: 0.25rem;
     margin-left: 0.5rem;
     border-radius: 4px;
 }

 .notification-close:hover {
     opacity: 1;
 }

 .notification-info {
     background-color: var(--primary-color);
     color: white;
 }

 .notification-success {
     background-color: var(--success-color);
     color: white;
 }

 .notification-error {
     background-color: var(--error-color);
     color: white;
 }

 .notification-warning {
     background-color: var(--warning-color);
     color: white;
 }

 @media (max-width: 640px) {
     .notification {
         right: 10px;
         left: 10px;
         min-width: auto;
     }
 }