:root {
            --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --success-gradient: linear-gradient(135deg, #84fab0 0%, #8fd3f4 100%);
            --warning-gradient: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
            --danger-gradient: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
            --info-gradient: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
            
            /* Layout Değişkenleri */
            --sidebar-width: 280px;
            --sidebar-collapsed-width: 80px;
            --topbar-height: 70px;
            --transition-speed: 0.3s;
        }
        
        /* Dark Mode */
        [data-theme="dark"] {
            --bg-primary: #1a1d29;
            --bg-secondary: #252936;
            --bg-tertiary: #2d3142;
            --text-primary: #e4e6eb;
            --text-secondary: #b0b3b8;
            --border-color: #3a3f52;
        }
        
        /* Light Mode */
        [data-theme="light"] {
            --bg-primary: #ffffff;
            --bg-secondary: #f8f9fa;
            --bg-tertiary: #e9ecef;
            --text-primary: #212529;
            --text-secondary: #6c757d;
            --border-color: #dee2e6;
        }
        
        /* Inter Font Import */
        @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
        
        body {
            background: #f8f9fa;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            min-height: 100vh;
            color: #212529;
            font-weight: 400;
            line-height: 1.6;
        }
        
        .navbar {
            background: var(--primary-gradient) !important;
            box-shadow: 0 2px 20px rgba(0,0,0,0.1);
        }
        
        .navbar-brand, .navbar-nav .nav-link {
            color: white !important;
            font-weight: 500;
        }
        
        /* Soft UI Cards */
        .card {
            border: none !important;
            border-radius: 16px !important;
            box-shadow: 0 2px 8px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.08) !important;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
            background: white !important;
            backdrop-filter: blur(10px);
        }
        
        .card:hover {
            transform: translateY(-2px) !important;
            box-shadow: 0 8px 16px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.12) !important;
        }
        
        .card-header {
            background: var(--primary-gradient) !important;
            color: white !important;
            border: none !important;
            border-radius: 15px 15px 0 0 !important;
            font-weight: 600 !important;
        }
        
        /* Soft UI Buttons */
        .btn-primary {
            background: var(--primary-gradient) !important;
            border: none !important;
            border-radius: 12px !important;
            padding: 12px 28px !important;
            font-weight: 500 !important;
            font-family: 'Inter', sans-serif;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1) !important;
            letter-spacing: 0.01em;
        }
        
        .btn-primary:hover {
            transform: translateY(-1px) !important;
            box-shadow: 0 6px 12px rgba(102, 126, 234, 0.25) !important;
        }
        
        .btn-primary:active {
            transform: translateY(0) !important;
        }
        
        .btn-outline-primary {
            border: 2px solid #667eea;
            color: #667eea;
            border-radius: 10px;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        
        .btn-outline-primary:hover {
            background: var(--primary-gradient);
            border-color: transparent;
            transform: translateY(-2px);
        }
        
        .progress {
            height: 10px;
            border-radius: 10px;
            background-color: #e9ecef;
        }
        
        .progress-bar {
            border-radius: 10px;
            transition: width 1s ease-in-out;
        }
        
        .progress-bar.bg-success {
            background: var(--success-gradient) !important;
        }
        
        .progress-bar.bg-warning {
            background: var(--warning-gradient) !important;
        }
        
        .progress-bar.bg-danger {
            background: var(--danger-gradient) !important;
        }
        
        /* Responsive tasarım iyileştirmeleri */
        @media (max-width: 768px) {
            .quick-login-btn {
                font-size: 0.75rem;
                padding: 0.25rem 0.5rem;
            }
            
            .table-responsive {
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
            }
            
            .table-responsive table {
                min-width: 600px;
            }
            
            .card {
                margin-bottom: 1rem;
            }
            
            .btn-group {
                flex-direction: column;
            }
            
            .btn-group .btn {
                margin-bottom: 0.25rem;
            }
            
            .pagination {
                flex-wrap: wrap;
            }
            
            .pagination .page-item {
                margin-bottom: 0.25rem;
            }
        }
        
        @media (max-width: 576px) {
            .container-fluid {
                padding-left: 0.5rem;
                padding-right: 0.5rem;
            }
            
            .card-header h5 {
                font-size: 1rem;
            }
            
            .btn {
                font-size: 0.875rem;
                padding: 0.375rem 0.75rem;
            }
        }
        
        .badge {
            border-radius: 20px;
            padding: 8px 15px;
            font-size: 0.85em;
        }
        
        .badge.bg-success {
            background: var(--success-gradient) !important;
        }
        
        .badge.bg-warning {
            background: var(--warning-gradient) !important;
            color: #333 !important;
        }
        
        .badge.bg-danger {
            background: var(--danger-gradient) !important;
        }
        
        .table {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        
        .table thead {
            background: var(--primary-gradient);
            color: white;
        }
        
        .table tbody tr:hover {
            background-color: #f8f9fa;
            transform: scale(1.01);
            transition: all 0.3s ease;
        }
        
        .sidebar {
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            padding: 20px;
        }
        
        .sidebar .nav-link {
            color: #6c757d;
            padding: 12px 20px;
            border-radius: 10px;
            margin-bottom: 5px;
            transition: all 0.3s ease;
        }
        
        .sidebar .nav-link:hover, .sidebar .nav-link.active {
            background: var(--primary-gradient);
            color: white;
        }
        
        .stat-card {
            background: white;
            border-radius: 15px;
            padding: 25px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: all 0.3s ease;
        }
        
        .stat-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
        }
        
        .stat-icon {
            width: 60px;
            height: 60px;
            border-radius: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: white;
        }
        
        .stat-icon.primary { background: var(--primary-gradient); }
        .stat-icon.success { background: var(--success-gradient); }
        .stat-icon.warning { background: var(--warning-gradient); color: #333 !important; }
        .stat-icon.danger { background: var(--danger-gradient); }
        .stat-icon.info { background: var(--info-gradient); color: #333 !important; }
        .stat-icon.secondary { background: var(--secondary-gradient, linear-gradient(135deg, #6c757d 0%, #495057 100%)); }
        
        /* Soft UI Form Controls */
        .form-control, .form-select {
            border: 1.5px solid #e9ecef;
            border-radius: 12px;
            padding: 12px 16px;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            font-family: 'Inter', sans-serif;
            font-size: 0.9375rem;
        }
        
        .form-control:focus, .form-select:focus {
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
            outline: none;
        }
        
        .modal-content {
            border: none;
            border-radius: 15px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.2);
        }
        
        .modal-header {
            background: var(--primary-gradient);
            color: white;
            border: none;
            border-radius: 15px 15px 0 0;
        }
        
        .btn-close {
            filter: brightness(0) invert(1);
        }
        
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .fade-in-up {
            animation: fadeInUp 0.6s ease-out;
        }
        
        .hover-shadow {
            transition: all 0.3s ease;
        }
        
        .hover-shadow:hover {
            box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3) !important;
            transform: translateY(-3px);
        }
        
        /* Responsive Tasarım İyileştirmeleri */
        @media (max-width: 768px) {
            .quick-login-btn {
                font-size: 0.75rem;
                padding: 0.25rem 0.5rem;
            }
            
            .table-responsive {
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
            }
            
            .card {
                margin-bottom: 1rem;
            }
            
            .navbar-nav {
                text-align: center;
            }
            
            .stat-card {
                margin-bottom: 1rem;
            }
        }
        
        @media (max-width: 576px) {
            .quick-login-btn {
                font-size: 0.7rem;
                padding: 0.2rem 0.4rem;
            }
            
            .card-header h5 {
                font-size: 1rem;
            }
        }
        
        /* Loading Spinner */
        .loading-spinner {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255,255,255,.3);
            border-radius: 50%;
            border-top-color: #fff;
            animation: spin 1s ease-in-out infinite;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        /* ============================================
           MODERN SIDEBAR LAYOUT CSS
           ============================================ */
        .app-wrapper {
            display: flex;
            min-height: 100vh;
        }
        
        .sidebar {
            width: var(--sidebar-width);
            background: var(--bg-primary);
            border-right: 1px solid var(--border-color);
            position: fixed;
            left: 0;
            top: 0;
            height: 100vh;
            overflow-y: auto;
            overflow-x: hidden;
            transition: all var(--transition-speed) ease;
            z-index: 1000;
            box-shadow: 2px 0 10px rgba(0,0,0,0.1);
            display: flex;
            flex-direction: column;
        }
        
        .sidebar.collapsed {
            width: var(--sidebar-collapsed-width);
        }
        
        .sidebar-header {
            padding: 1.5rem;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: var(--topbar-height);
        }
        
        .sidebar-logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            color: var(--text-primary);
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            white-space: nowrap;
        }
        
        .sidebar.collapsed .sidebar-logo span {
            display: none;
        }
        
        .sidebar-toggle {
            background: none;
            border: none;
            color: var(--text-secondary);
            font-size: 1.2rem;
            cursor: pointer;
            padding: 0.5rem;
            border-radius: 8px;
            transition: all 0.2s;
        }
        
        .sidebar-toggle:hover {
            background: var(--bg-tertiary);
            color: var(--text-primary);
        }
        
        .sidebar-nav {
            padding: 1rem 0;
            flex: 1;
            overflow-y: auto;
            overflow-x: hidden;
        }
        
        .nav-section {
            margin-bottom: 1.5rem;
        }
        
        .nav-section-title {
            padding: 0.5rem 1.5rem;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--text-secondary);
            display: block;
        }
        
        .sidebar.collapsed .nav-section-title {
            display: none;
        }
        
        .sidebar .nav-item {
            margin: 0.25rem 0.75rem;
        }
        
        .sidebar .nav-link {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.75rem 1rem;
            color: var(--text-secondary);
            text-decoration: none;
            border-radius: 10px;
            transition: all 0.2s;
            position: relative;
        }
        
        .sidebar .nav-link i {
            width: 20px;
            text-align: center;
            font-size: 1.1rem;
        }
        
        .sidebar .nav-link span {
            flex: 1;
            white-space: nowrap;
        }
        
        .sidebar.collapsed .nav-link span {
            display: none;
        }
        
        .sidebar .nav-link:hover {
            background: var(--bg-tertiary);
            color: var(--text-primary);
            transform: translateX(5px);
        }
        
        .sidebar .nav-link.active {
            background: var(--primary-gradient);
            color: white;
            box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
        }
        
        .sidebar .nav-link.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 60%;
            background: white;
            border-radius: 0 3px 3px 0;
        }
        
        .sidebar-footer {
            padding: 1rem;
            border-top: 1px solid var(--border-color);
            background: var(--bg-primary);
            flex-shrink: 0;
            margin-top: auto;
        }
        
        .main-content {
            flex: 1;
            margin-left: var(--sidebar-width);
            transition: margin-left var(--transition-speed) ease;
            min-height: 100vh;
        }
        
        .sidebar.collapsed ~ .main-content {
            margin-left: var(--sidebar-collapsed-width);
        }
        
        .topbar {
            height: var(--topbar-height);
            background: var(--bg-primary);
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 2rem;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        
        .topbar-left {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        
        .topbar-right {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        
        .breadcrumb-nav {
            padding: 0.5rem 0;
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        
        .content-wrapper {
            padding: 2rem;
        }
        
        .theme-toggle {
            background: var(--bg-tertiary);
            border: none;
            color: var(--text-primary);
            width: 40px;
            height: 40px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s;
        }
        
        .theme-toggle:hover {
            background: var(--primary-gradient);
            color: white;
            transform: scale(1.05);
        }
        
        .layout-toggle {
            position: relative;
        }
        
        .layout-menu {
            position: absolute;
            top: 100%;
            right: 0;
            margin-top: 0.5rem;
            background: var(--bg-primary);
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 0.5rem;
            min-width: 200px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            display: none;
        }
        
        .layout-menu.show {
            display: block;
        }
        
        .layout-option {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.75rem 1rem;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.2s;
            color: var(--text-primary);
            text-decoration: none;
        }
        
        .layout-option:hover {
            background: var(--bg-tertiary);
        }
        
        .layout-option.active {
            background: var(--primary-gradient);
            color: white;
        }
        
        .mobile-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.5);
            z-index: 999;
        }
        
        .mobile-overlay.show {
            display: block;
        }
        
        .user-dropdown {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.5rem 1rem;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.2s;
        }
        
        .user-dropdown:hover {
            background: var(--bg-tertiary);
        }
        
        .user-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            object-fit: cover;
            border: 2px solid var(--border-color);
        }
        
        .user-info {
            display: flex;
            flex-direction: column;
        }
        
        .user-name {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-primary);
        }
        
        .user-role {
            font-size: 0.75rem;
            color: var(--text-secondary);
        }
        
        @media (max-width: 992px) {
            .sidebar {
                transform: translateX(-100%);
            }
            
            .sidebar.show {
                transform: translateX(0);
            }
            
            .main-content {
                margin-left: 0;
            }
        }