* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }

        :root {
            --primary: #4361ee;
            --primary-dark: #3a56d4;
            --secondary: #7209b7;
            --success: #4cc9f0;
            --warning: #f72585;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --border-radius: 12px;
            --box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }

        body {
            background-color: #f5f7ff;
            color: var(--dark);
            line-height: 1.6;
            min-height: 100vh;
            padding-bottom: 40px;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header Styles */
        header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            padding: 1.5rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .logo-icon {
            font-size: 2.2rem;
            background: rgba(255, 255, 255, 0.2);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .logo-text h1 {
            font-size: 1.8rem;
            font-weight: 700;
        }

        .logo-text span {
            font-size: 0.9rem;
            opacity: 0.9;
        }

        .premium-badge {
            background: linear-gradient(45deg, #ff9a00, #ff5e00);
            color: white;
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        /* Main Layout */
        .app-container {
            display: grid;
            grid-template-columns: 1fr 3fr;
            gap: 25px;
            margin-top: 25px;
        }

        @media (max-width: 1024px) {
            .app-container {
                grid-template-columns: 1fr;
            }
        }

        /* Sidebar */
        .sidebar {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 25px;
            height: fit-content;
            position: sticky;
            top: 100px;
        }

        .sidebar-section {
            margin-bottom: 30px;
        }

        .sidebar-section h3 {
            color: var(--primary);
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--light-gray);
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .sidebar-section h3 i {
            color: var(--secondary);
        }

        .feature-list {
            list-style: none;
        }

        .feature-list li {
            padding: 10px 0;
            display: flex;
            align-items: center;
            gap: 10px;
            border-bottom: 1px solid var(--light-gray);
        }

        .feature-list li:last-child {
            border-bottom: none;
        }

        .feature-list i {
            color: var(--success);
            font-size: 1.1rem;
        }

        /* Main Content */
        .main-content {
            display: flex;
            flex-direction: column;
            gap: 25px;
        }

        /* Upload Section */
        .upload-section {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 25px;
        }

        .section-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .section-header h2 {
            color: var(--primary);
            font-size: 1.5rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .mode-selector {
            display: flex;
            gap: 10px;
            background: var(--light-gray);
            padding: 5px;
            border-radius: 8px;
        }

        .mode-btn {
            padding: 8px 16px;
            border: none;
            background: transparent;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }

        .mode-btn.active {
            background: var(--primary);
            color: white;
        }

        .upload-area {
            border: 3px dashed var(--primary);
            border-radius: var(--border-radius);
            padding: 40px 20px;
            text-align: center;
            margin-bottom: 20px;
            cursor: pointer;
            transition: var(--transition);
        }

        .upload-area:hover {
            background-color: rgba(67, 97, 238, 0.05);
        }

        .upload-area i {
            font-size: 3.5rem;
            color: var(--primary);
            margin-bottom: 15px;
        }

        .upload-area h3 {
            font-size: 1.4rem;
            margin-bottom: 10px;
            color: var(--dark);
        }

        .upload-area p {
            color: var(--gray);
            margin-bottom: 20px;
        }

        .file-input {
            display: none;
        }

        .file-list {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 20px;
        }

        .file-item {
            background: var(--light-gray);
            padding: 10px 15px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .file-item i {
            color: var(--primary);
        }

        /* Input Section */
        .input-section {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 25px;
        }

        .input-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 20px;
            margin-bottom: 25px;
        }

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

        .form-group label {
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .form-group label i {
            color: var(--primary);
        }

        .form-control {
            padding: 12px 15px;
            border: 2px solid var(--light-gray);
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }

        .unit-selector {
            display: flex;
            gap: 5px;
            margin-top: 5px;
        }

        .unit-btn {
            padding: 6px 12px;
            border: 1px solid var(--light-gray);
            background: white;
            border-radius: 6px;
            cursor: pointer;
            transition: var(--transition);
        }

        .unit-btn.active {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
        }

        .btn-group {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }

        .btn {
            padding: 12px 24px;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

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

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background: var(--light-gray);
            color: var(--dark);
        }

        .btn-secondary:hover {
            background: #dde1e7;
        }

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

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

        /* Results Section */
        .results-section {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 25px;
        }

        .results-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .tabs {
            display: flex;
            gap: 5px;
            background: var(--light-gray);
            padding: 5px;
            border-radius: 8px;
        }

        .tab-btn {
            padding: 8px 16px;
            border: none;
            background: transparent;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }

        .tab-btn.active {
            background: var(--primary);
            color: white;
        }

        .table-container {
            overflow-x: auto;
            border-radius: 8px;
            border: 1px solid var(--light-gray);
        }

        table {
            width: 100%;
            border-collapse: collapse;
        }

        th {
            background: var(--light-gray);
            padding: 15px;
            text-align: left;
            font-weight: 600;
            color: var(--dark);
            border-bottom: 2px solid #dee2e6;
        }

        td {
            padding: 15px;
            border-bottom: 1px solid #dee2e6;
        }

        tr:hover {
            background-color: rgba(67, 97, 238, 0.03);
        }

        .item-group {
            font-weight: 600;
            color: var(--primary);
        }

        .alert {
            padding: 12px 15px;
            border-radius: 8px;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .alert-warning {
            background: rgba(247, 37, 133, 0.1);
            color: var(--warning);
            border-left: 4px solid var(--warning);
        }

        .alert-success {
            background: rgba(76, 201, 240, 0.1);
            color: #0a7e8f;
            border-left: 4px solid var(--success);
        }

        /* Analytics Section */
        .analytics-section {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 25px;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 25px;
        }

        .stat-card {
            background: linear-gradient(135deg, #f5f7ff 0%, #eef1ff 100%);
            padding: 20px;
            border-radius: var(--border-radius);
            border-left: 5px solid var(--primary);
        }

        .stat-card h4 {
            font-size: 0.9rem;
            color: var(--gray);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .stat-card p {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary);
        }

        .chart-container {
            height: 300px;
            margin-top: 20px;
            position: relative;
        }

        /* Export Section */
        .export-section {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 25px;
        }

        .export-options {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 15px;
        }

        .export-btn {
            padding: 12px 20px;
            border: 2px solid var(--light-gray);
            background: white;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
            flex: 1;
            min-width: 180px;
            justify-content: center;
        }

        .export-btn:hover {
            border-color: var(--primary);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .export-btn.excel {
            color: #217346;
        }

        .export-btn.json {
            color: #f0a500;
        }

        .export-btn.csv {
            color: #0070c0;
        }

        /* Footer */
        footer {
            margin-top: 40px;
            text-align: center;
            color: var(--gray);
            font-size: 0.9rem;
            padding-top: 20px;
            border-top: 1px solid var(--light-gray);
        }

        /* Mobile Responsiveness */
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                gap: 15px;
                text-align: center;
            }
            
            .input-grid {
                grid-template-columns: 1fr;
            }
            
            .btn-group {
                flex-direction: column;
            }
            
            .export-options {
                flex-direction: column;
            }
            
            .stats-grid {
                grid-template-columns: 1fr;
            }
            
            .section-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 15px;
            }
            
            .tabs, .mode-selector {
                width: 100%;
                justify-content: center;
            }
        }

        /* Animation for AI detection */
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }

        .ai-detected {
            animation: pulse 1.5s ease-in-out;
            border-color: var(--success) !important;
        }