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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            color: #333;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        .header {
            background: rgba(255, 255, 255, 0.95);
            padding: 20px;
            border-radius: 15px;
            margin-bottom: 30px;
            text-align: center;
            backdrop-filter: blur(10px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
        }

        .header h1 {
            color: #4a5568;
            font-size: 2.5rem;
            margin-bottom: 10px;
        }

        .header p {
            color: #718096;
            font-size: 1.1rem;
        }

        .nav-tabs {
            display: flex;
            justify-content: center;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 15px;
            padding: 10px;
            margin-bottom: 30px;
            backdrop-filter: blur(10px);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        }

        .nav-tab {
            background: transparent;
            border: none;
            padding: 12px 24px;
            margin: 0 5px;
            border-radius: 10px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            transition: all 0.3s ease;
            color: #4a5568;
        }

        .nav-tab:hover {
            background: rgba(102, 126, 234, 0.1);
            color: #667eea;
            transform: translateY(-2px);
        }

        .nav-tab.active {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
        }

        .tab-content {
            display: none;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 15px;
            padding: 30px;
            backdrop-filter: blur(10px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
            animation: fadeIn 0.5s ease;
        }

        .tab-content.active {
            display: block;
        }

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

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 30px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
        }

        .form-group.full-width {
            grid-column: 1 / -1;
        }

        .form-group label {
            font-weight: 600;
            margin-bottom: 8px;
            color: #4a5568;
            font-size: 0.9rem;
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            padding: 12px 16px;
            border: 2px solid #e2e8f0;
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s ease;
            background: rgba(255, 255, 255, 0.8);
        }

        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
            background: white;
        }

        .form-group textarea {
            resize: vertical;
            min-height: 100px;
        }

        .file-input-wrapper {
            position: relative;
            overflow: hidden;
            display: inline-block;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 12px 20px;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .file-input-wrapper:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }

        .file-input-wrapper input[type=file] {
            position: absolute;
            left: -9999px;
        }

        .btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 10px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            transition: all 0.3s ease;
            margin: 5px;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }

        .btn-secondary {
            background: linear-gradient(135deg, #718096 0%, #4a5568 100%);
        }

        .btn-danger {
            background: linear-gradient(135deg, #e53e3e 0%, #c53030 100%);
        }

        .btn-success {
            background: linear-gradient(135deg, #38a169 0%, #2f855a 100%);
        }

        .items-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .item-card {
            background: rgba(255, 255, 255, 0.9);
            border-radius: 15px;
            padding: 20px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }

        .item-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
            border-color: #667eea;
        }

        .item-card h3 {
            color: #4a5568;
            margin-bottom: 15px;
            font-size: 1.3rem;
        }

        .item-info {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 10px;
            font-size: 0.9rem;
            color: #718096;
        }

        .item-actions {
            display: flex;
            gap: 10px;
            margin-top: 15px;
            justify-content: center;
        }

        .item-actions .btn {
            padding: 8px 16px;
            font-size: 0.9rem;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .stat-card {
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
            border-radius: 15px;
            padding: 20px;
            text-align: center;
            backdrop-filter: blur(10px);
            border: 2px solid rgba(102, 126, 234, 0.2);
        }

        .stat-card h3 {
            font-size: 2rem;
            color: #667eea;
            margin-bottom: 5px;
        }

        .stat-card p {
            color: #718096;
            font-weight: 600;
        }

        .notification {
            position: fixed;
            top: 20px;
            right: 20px;
            padding: 15px 20px;
            border-radius: 10px;
            color: white;
            font-weight: 600;
            z-index: 1000;
            transform: translateX(400px);
            transition: transform 0.3s ease;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
        }

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

        .notification.success {
            background: linear-gradient(135deg, #38a169 0%, #2f855a 100%);
        }

        .notification.error {
            background: linear-gradient(135deg, #e53e3e 0%, #c53030 100%);
        }

        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(5px);
        }

        .modal-content {
            background: white;
            margin: 5% auto;
            padding: 30px;
            border-radius: 15px;
            width: 90%;
            max-width: 600px;
            max-height: 80vh;
            overflow-y: auto;
            animation: slideIn 0.3s ease;
        }

        @keyframes slideIn {
            from { opacity: 0; transform: translateY(-50px) scale(0.9); }
            to { opacity: 1; transform: translateY(0) scale(1); }
        }

        .close {
            color: #aaa;
            float: right;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
            transition: color 0.3s ease;
        }

        .close:hover {
            color: #667eea;
        }

        .image-preview {
            max-width: 200px;
            max-height: 200px;
            border-radius: 10px;
            margin-top: 10px;
            border: 2px solid #e2e8f0;
        }

        @media (max-width: 768px) {
            .form-grid {
                grid-template-columns: 1fr;
            }
            
            .nav-tabs {
                flex-wrap: wrap;
            }
            
            .items-grid {
                grid-template-columns: 1fr;
            }
            
            .container {
                padding: 10px;
            }
        }

        .loading {
            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); }
        }