:root {
            --primary-color: #4361ee;
            --secondary-color: #3f37c9;
            --accent-color: #4895ef;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --success-color: #4cc9f0;
            --warning-color: #f8961e;
            --danger-color: #f72585;
            --border-radius: 8px;
            --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: #f5f7fa;
            color: var(--dark-color);
            line-height: 1.6;
        }

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

        header {
            text-align: center;
            margin-bottom: 30px;
            padding: 20px 0;
        }

        h1 {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 10px;
        }

        .subtitle {
            color: #6c757d;
            font-size: 1.1rem;
        }

        .tool-container {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        @media (min-width: 992px) {
            .tool-container {
                grid-template-columns: 1fr 1fr;
            }
        }

        .upload-section {
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 20px;
        }

        .preview-section {
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 20px;
        }

        .drop-area {
            border: 2px dashed #dee2e6;
            border-radius: var(--border-radius);
            padding: 30px;
            text-align: center;
            margin-bottom: 20px;
            transition: var(--transition);
            cursor: pointer;
        }

        .drop-area.highlight {
            border-color: var(--accent-color);
            background-color: rgba(72, 149, 239, 0.05);
        }

        .drop-area i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 10px;
        }

        .drop-area p {
            margin-bottom: 15px;
            color: #6c757d;
        }

        .btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 10px 15px;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-size: 0.9rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

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

        .btn-sm {
            padding: 6px 12px;
            font-size: 0.8rem;
        }

        .btn-outline {
            background-color: transparent;
            border: 1px solid var(--primary-color);
            color: var(--primary-color);
        }

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

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

        .btn-success:hover {
            background-color: #3aa8d8;
        }

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

        .btn-warning:hover {
            background-color: #e07c0c;
        }

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

        .btn-danger:hover {
            background-color: #e5177a;
        }

        .file-list {
            margin-top: 20px;
            border: 1px solid #dee2e6;
            border-radius: var(--border-radius);
            max-height: 300px;
            overflow-y: auto;
            position: relative;
            min-height: 120px;
        }

        .file-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 15px;
            border-bottom: 1px solid #dee2e6;
        }

        .file-item:last-child {
            border-bottom: none;
        }

        .file-info {
            display: flex;
            align-items: center;
            gap: 10px;
            overflow: hidden;
        }

        .file-icon {
            color: var(--danger-color);
            font-size: 1.2rem;
            flex-shrink: 0;
        }

        .file-name {
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .file-size {
            color: #6c757d;
            font-size: 0.8rem;
            margin-top: 2px;
        }

        .file-actions {
            display: flex;
            gap: 5px;
        }

        .preview-container {
            margin-top: 20px;
            border: 1px solid #dee2e6;
            border-radius: var(--border-radius);
            height: 400px;
            overflow-y: auto;
            position: relative;
            background-color: #f8f9fa;
        }

        .preview-placeholder {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
            color: #6c757d;
            margin-top: 5px;
            margin-bottom: 5px;
        }

        .preview-placeholder i {
            font-size: 3rem;
            margin-bottom: 5px;
            color: #adb5bd;
        }

        .pdf-preview {
            width: 100%;
            height: 100%;
            border: none;
        }

        .action-buttons {
            display: flex;
            gap: 10px;
            margin-top: 20px;
            flex-wrap: wrap;
        }

        .loading {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255,255,255,.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s ease-in-out infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .hidden {
            display: none;
        }

        .info-section {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 30px;
            margin-bottom: 30px;
        }

        .info-card {
            flex: 1;
            min-width: 250px;
            background-color: white;
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: var(--box-shadow);
            text-align: center;
            transition: var(--transition);
        }

        .info-card:hover {
            transform: translateY(-5px);
        }

        .info-card i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }

        .info-card h3 {
            margin-bottom: 10px;
            color: var(--dark-color);
        }

        .info-card p {
            color: var(--gray-color);
            font-size: 0.9rem;
        }

        footer {
            text-align: center;
            margin-top: 10px;
            padding: 10px;
            color: #061420;
            font-size: 1.0rem;
        }

        /* Icons will be loaded from Font Awesome */
        .fas, .far {
            font-size: 1rem;
        }

        /* Responsive adjustments */
        @media (max-width: 768px) {
            .tool-container {
                grid-template-columns: 1fr;
            }
            
            .preview-container {
                height: 300px;
            }
        }