/* Same CSS as before, unchanged */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }

        :root {
            --primary: #3b82f6;
            --primary-dark: #2563eb;
            --secondary: #8b5cf6;
            --success: #10b981;
            --warning: #f59e0b;
            --danger: #ef4444;
            --light: #f8fafc;
            --dark: #1e293b;
            --gray: #64748b;
            --light-gray: #e2e8f0;
            --border-radius: 16px;
            --box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
        }

        body {
            background: linear-gradient(135deg, #f0f9ff 0%, #f5f3ff 100%);
            color: var(--dark);
            line-height: 1.6;
            min-height: 100vh;
            padding-bottom: 60px;
        }

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

        /* Header */
        header {
            background: var(--gradient-primary);
            color: white;
            padding: 1.5rem 0;
            box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
            position: sticky;
            top: 0;
            z-index: 1000;
            backdrop-filter: blur(10px);
        }

        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .logo-icon {
            width: 50px;
            height: 50px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
        }

        .logo-text h1 {
            font-size: 1.8rem;
            font-weight: 700;
            line-height: 1.2;
        }

        .logo-text span {
            font-size: 0.9rem;
            opacity: 0.9;
            font-weight: 400;
        }

        .pro-badge {
            background: linear-gradient(45deg, #fbbf24, #f59e0b);
            color: #78350f;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-left: 10px;
        }

        .header-stats {
            display: flex;
            gap: 25px;
            font-size: 0.9rem;
        }

        .stat-item {
            display: flex;
            align-items: center;
            gap: 8px;
            opacity: 0.9;
        }

        .stat-item i {
            font-size: 1.1rem;
        }

        /* Main Layout */
        .app-container {
            display: grid;
            grid-template-columns: 320px 1fr;
            gap: 30px;
            margin-top: 30px;
        }

        @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: 30px;
            height: fit-content;
            position: sticky;
            top: 110px;
        }

        .compression-modes {
            margin-bottom: 30px;
        }

        .mode-selector {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-top: 15px;
        }

        .mode-btn {
            padding: 16px;
            background: var(--light);
            border: 2px solid var(--light-gray);
            border-radius: 12px;
            display: flex;
            align-items: center;
            gap: 12px;
            cursor: pointer;
            transition: var(--transition);
            text-align: left;
            width: 100%;
        }

        .mode-btn:hover {
            border-color: var(--primary);
            background: rgba(59, 130, 246, 0.05);
        }

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

        .mode-btn i {
            font-size: 1.2rem;
            width: 24px;
        }

        .mode-info {
            flex: 1;
        }

        .mode-name {
            font-weight: 600;
            font-size: 1rem;
            margin-bottom: 4px;
        }

        .mode-desc {
            font-size: 0.85rem;
            opacity: 0.8;
        }

        .compression-level {
            margin: 30px 0;
        }

        .slider-container {
            background: var(--light);
            padding: 25px;
            border-radius: 12px;
            margin-top: 15px;
        }

        .slider-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 15px;
        }

        .slider-header span {
            font-weight: 600;
            color: var(--dark);
        }

        .slider-value {
            font-weight: 700;
            color: var(--primary);
            font-size: 1.1rem;
        }

        .slider {
            -webkit-appearance: none;
            width: 100%;
            height: 8px;
            border-radius: 4px;
            background: var(--light-gray);
            outline: none;
        }

        .slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--primary);
            cursor: pointer;
            border: 3px solid white;
            box-shadow: 0 2px 10px rgba(59, 130, 246, 0.3);
        }

        .slider-labels {
            display: flex;
            justify-content: space-between;
            margin-top: 8px;
            font-size: 0.85rem;
            color: var(--gray);
        }

        /* Features List */
        .feature-list {
            list-style: none;
            margin-top: 30px;
        }

        .feature-list li {
            padding: 12px 0;
            display: flex;
            align-items: center;
            gap: 12px;
            border-bottom: 1px solid var(--light-gray);
            font-size: 0.95rem;
        }

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

        .feature-list i {
            color: var(--success);
            font-size: 1rem;
        }

        /* Main Content */
        .main-content {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }

        /* Upload Section */
        .upload-section {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 40px;
        }

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

        .section-header h2 {
            color: var(--primary);
            font-size: 1.8rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 10px;
        }

        .section-header p {
            color: var(--gray);
            font-size: 1.1rem;
        }

        .upload-area {
            border: 3px dashed var(--primary);
            border-radius: var(--border-radius);
            padding: 60px 40px;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            background: rgba(59, 130, 246, 0.02);
            position: relative;
            overflow: hidden;
        }

        .upload-area:hover {
            background: rgba(59, 130, 246, 0.05);
            border-color: var(--primary-dark);
        }

        .upload-area.drag-over {
            background: rgba(59, 130, 246, 0.1);
            border-color: var(--success);
            transform: scale(1.01);
        }

        .upload-icon {
            font-size: 4rem;
            color: var(--primary);
            margin-bottom: 20px;
        }

        .upload-text h3 {
            font-size: 1.8rem;
            margin-bottom: 10px;
            color: var(--dark);
        }

        .upload-text p {
            color: var(--gray);
            margin-bottom: 25px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .file-input {
            display: none;
        }

        .upload-btn {
            padding: 16px 40px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 12px;
            font-weight: 600;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 12px;
        }

        .upload-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
        }

        /* File List */
        .file-list {
            margin-top: 30px;
        }

        .file-item {
            background: var(--light);
            border-radius: 12px;
            padding: 20px;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 20px;
            transition: var(--transition);
            border: 2px solid transparent;
        }

        .file-item:hover {
            border-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: var(--box-shadow);
        }

        .file-icon {
            width: 60px;
            height: 60px;
            background: rgba(59, 130, 246, 0.1);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: var(--primary);
        }

        .file-info {
            flex: 1;
        }

        .file-name {
            font-weight: 600;
            font-size: 1.1rem;
            margin-bottom: 5px;
            color: var(--dark);
            word-break: break-all;
        }

        .file-size {
            color: var(--gray);
            font-size: 0.9rem;
            display: flex;
            gap: 15px;
        }

        .file-actions {
            display: flex;
            gap: 10px;
        }

        .action-btn {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            border: none;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            font-size: 1rem;
        }

        .action-btn.compress {
            background: rgba(16, 185, 129, 0.1);
            color: var(--success);
        }

        .action-btn.compress:hover {
            background: rgba(16, 185, 129, 0.2);
        }

        .action-btn.remove {
            background: rgba(239, 68, 68, 0.1);
            color: var(--danger);
        }

        .action-btn.remove:hover {
            background: rgba(239, 68, 68, 0.2);
        }

        /* Compression Section */
        .compression-section {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 40px;
        }

        .compression-controls {
            display: flex;
            gap: 20px;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }

        .control-group {
            flex: 1;
            min-width: 200px;
        }

        .control-label {
            display: block;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 8px;
        }

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

        .control-select {
            width: 100%;
            padding: 16px;
            border: 2px solid var(--light-gray);
            border-radius: 12px;
            font-size: 1rem;
            background: white;
            cursor: pointer;
            transition: var(--transition);
        }

        .control-select:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }

        .btn-group {
            display: flex;
            gap: 15px;
            margin-top: 30px;
            flex-wrap: wrap;
        }

        .btn {
            padding: 18px 36px;
            border: none;
            border-radius: 12px;
            font-weight: 600;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            min-width: 200px;
        }

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

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(59, 130, 246, 0.3);
        }

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

        .btn-success:hover {
            background: #0da271;
            transform: translateY(-3px);
        }

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

        .btn-secondary:hover {
            background: #d1d5db;
            transform: translateY(-3px);
        }

        /* Progress Section */
        .progress-section {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 40px;
            margin-top: 30px;
        }

        .progress-container {
            margin-top: 20px;
        }

        .progress-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 15px;
        }

        .progress-label {
            font-weight: 600;
            color: var(--dark);
        }

        .progress-percentage {
            font-weight: 700;
            color: var(--primary);
        }

        .progress-bar {
            height: 12px;
            background: var(--light-gray);
            border-radius: 6px;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            background: var(--primary);
            border-radius: 6px;
            width: 0%;
            transition: width 0.3s ease;
        }

        .progress-stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 40px;
        }

        .stat-card {
            background: var(--light);
            padding: 25px;
            border-radius: 12px;
            text-align: center;
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--box-shadow);
        }

        .stat-icon {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 15px;
        }

        .stat-value {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 5px;
        }

        .stat-label {
            color: var(--gray);
            font-size: 0.9rem;
        }

        /* Results Section */
        .results-section {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 40px;
            margin-top: 30px;
        }

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

        .result-card {
            background: var(--light);
            border-radius: 12px;
            padding: 30px;
            text-align: center;
            border: 2px solid transparent;
            transition: var(--transition);
        }

        .result-card:hover {
            border-color: var(--primary);
            transform: translateY(-5px);
        }

        .result-card.before {
            border-color: var(--warning);
        }

        .result-card.after {
            border-color: var(--success);
        }

        .result-title {
            font-weight: 600;
            font-size: 1.2rem;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .result-title.before {
            color: var(--warning);
        }

        .result-title.after {
            color: var(--success);
        }

        .result-size {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .result-savings {
            background: rgba(16, 185, 129, 0.1);
            color: var(--success);
            padding: 12px;
            border-radius: 8px;
            font-weight: 600;
            margin-top: 15px;
            display: inline-block;
        }

        .result-actions {
            display: flex;
            gap: 10px;
            margin-top: 25px;
            justify-content: center;
        }

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

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

        .result-btn.download:hover {
            background: #0da271;
            transform: translateY(-2px);
        }

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

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

        /* Settings Section */
        .settings-section {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 40px;
            margin-top: 30px;
        }

        .settings-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
            margin-top: 30px;
        }

        .setting-option {
            background: var(--light);
            padding: 25px;
            border-radius: 12px;
            cursor: pointer;
            transition: var(--transition);
            border: 2px solid transparent;
        }

        .setting-option:hover {
            border-color: var(--primary);
            transform: translateY(-3px);
        }

        .setting-option.active {
            border-color: var(--success);
            background: rgba(16, 185, 129, 0.05);
        }

        .setting-icon {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 15px;
        }

        .setting-title {
            font-weight: 600;
            font-size: 1.1rem;
            margin-bottom: 8px;
            color: var(--dark);
        }

        .setting-desc {
            color: var(--gray);
            font-size: 0.9rem;
            line-height: 1.5;
        }

        /* AI Features */
        .ai-section {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 40px;
            margin-top: 30px;
        }

        .ai-features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
            margin-top: 30px;
        }

        .ai-card {
            background: linear-gradient(135deg, #f0f9ff 0%, #f5f3ff 100%);
            padding: 30px;
            border-radius: 12px;
            border-left: 5px solid var(--primary);
            transition: var(--transition);
        }

        .ai-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--box-shadow);
        }

        .ai-icon {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 20px;
        }

        .ai-title {
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 12px;
            color: var(--dark);
        }

        .ai-desc {
            color: var(--gray);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* Footer */
        footer {
            margin-top: 60px;
            text-align: center;
            color: var(--gray);
            font-size: 0.9rem;
            padding-top: 30px;
            border-top: 1px solid var(--light-gray);
        }

        /* Alerts */
        .alert {
            padding: 20px;
            border-radius: 12px;
            margin-bottom: 25px;
            display: flex;
            align-items: center;
            gap: 15px;
            border-left: 5px solid;
            animation: slideIn 0.3s ease-out;
        }

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

        .alert-info {
            background: rgba(59, 130, 246, 0.1);
            border-left-color: var(--primary);
            color: #1e40af;
        }

        .alert-success {
            background: rgba(16, 185, 129, 0.1);
            border-left-color: var(--success);
            color: #065f46;
        }

        .alert-warning {
            background: rgba(245, 158, 11, 0.1);
            border-left-color: var(--warning);
            color: #92400e;
        }

        .alert-danger {
            background: rgba(239, 68, 68, 0.1);
            border-left-color: var(--danger);
            color: #991b1b;
        }

        /* Modal */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 2000;
            align-items: center;
            justify-content: center;
            padding: 20px;
            backdrop-filter: blur(5px);
        }

        .modal.active {
            display: flex;
        }

        .modal-content {
            background: white;
            border-radius: var(--border-radius);
            padding: 40px;
            max-width: 800px;
            width: 100%;
            max-height: 90vh;
            overflow-y: auto;
            position: relative;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
        }

        .modal-close {
            position: absolute;
            top: 20px;
            right: 20px;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--gray);
            transition: var(--transition);
        }

        .modal-close:hover {
            color: var(--danger);
        }

        /* PDF Preview */
        .pdf-preview {
            width: 100%;
            height: 500px;
            border: 2px solid var(--light-gray);
            border-radius: 12px;
            overflow: hidden;
            margin-top: 20px;
        }

        .pdf-preview canvas {
            width: 100%;
            height: 100%;
            object-fit: contain;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                text-align: center;
                gap: 15px;
            }
            
            .header-stats {
                justify-content: center;
                flex-wrap: wrap;
            }
            
            .upload-area {
                padding: 40px 20px;
            }
            
            .upload-icon {
                font-size: 3rem;
            }
            
            .upload-text h3 {
                font-size: 1.5rem;
            }
            
            .btn {
                min-width: 100%;
            }
            
            .compression-controls {
                flex-direction: column;
            }
            
            .results-grid {
                grid-template-columns: 1fr;
            }
            
            .ai-features {
                grid-template-columns: 1fr;
            }
            
            .progress-stats {
                grid-template-columns: 1fr;
            }
        }

        /* Loading Animation */
        .loading-spinner {
            display: none;
            text-align: center;
            padding: 40px;
        }

        .spinner {
            width: 60px;
            height: 60px;
            border: 5px solid var(--light-gray);
            border-top: 5px solid var(--primary);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 0 auto 20px;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* File Size Visualization */
        .size-visualization {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 30px;
            margin: 40px 0;
            flex-wrap: wrap;
        }

        .size-circle {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .size-circle.before {
            background: conic-gradient(var(--warning) 0% 100%);
            color: var(--warning);
        }

        .size-circle.after {
            background: conic-gradient(var(--success) 0% 100%);
            color: var(--success);
        }

        .size-circle-inner {
            width: 130px;
            height: 130px;
            background: white;
            border-radius: 50%;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            position: absolute;
        }

        .size-circle-value {
            font-size: 1.8rem;
            font-weight: 700;
        }

        .size-circle-label {
            font-size: 0.9rem;
            opacity: 0.8;
        }

        .size-arrow {
            font-size: 2rem;
            color: var(--primary);
        }

        /* Tooltip */
        .tooltip {
            position: relative;
            display: inline-block;
        }

        .tooltip .tooltip-text {
            visibility: hidden;
            width: 200px;
            background-color: var(--dark);
            color: white;
            text-align: center;
            border-radius: 6px;
            padding: 10px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            margin-left: -100px;
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.85rem;
        }

        .tooltip:hover .tooltip-text {
            visibility: visible;
            opacity: 1;
        }