:root {
            --primary: #4361ee;
            --primary-dark: #3a56d4;
            --secondary: #7209b7;
            --accent: #f72585;
            --light: #f8f9fa;
            --dark: #212529;
            --success: #4cc9f0;
            --warning: #f8961e;
            --danger: #e63946;
            --gray: #6c757d;
            --gray-light: #e9ecef;
            --border-radius: 12px;
            --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }

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

        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            color: var(--dark);
            line-height: 1.6;
            min-height: 100vh;
            padding: 20px;
        }

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

        header {
            text-align: center;
            margin-bottom: 40px;
            padding: 30px 20px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }

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

        .subtitle {
            color: var(--gray);
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto;
        }

        .main-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-bottom: 40px;
        }

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

        .card {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 25px;
            transition: var(--transition);
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
        }

        .card-title {
            font-size: 1.4rem;
            margin-bottom: 20px;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .card-title i {
            color: var(--secondary);
        }

        .input-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark);
        }

        input, select {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid var(--gray-light);
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }

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

        .btn-secondary {
            background: var(--secondary);
        }

        .btn-secondary:hover {
            background: #6411a3;
        }

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

        .btn-success:hover {
            background: #3ab3d6;
        }

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

        .btn-danger:hover {
            background: #d32f3a;
        }

        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }

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

        .btn-group {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-top: 15px;
        }

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

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

        .upload-area.active {
            border-color: var(--success);
            background: rgba(76, 201, 240, 0.1);
        }

        .upload-icon {
            font-size: 3rem;
            color: var(--gray-light);
            margin-bottom: 15px;
            transition: var(--transition);
        }

        .upload-area:hover .upload-icon {
            color: var(--primary);
        }

        .file-input {
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            opacity: 0;
            cursor: pointer;
        }

        .image-preview {
            max-width: 100%;
            max-height: 300px;
            border-radius: var(--border-radius);
            margin-bottom: 20px;
            display: none;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .base64-output {
            background: var(--dark);
            color: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            font-family: 'Consolas', 'Monaco', monospace;
            font-size: 0.85rem;
            line-height: 1.4;
            margin-top: 20px;
            max-height: 400px;
            overflow-y: auto;
            position: relative;
            word-break: break-all;
        }

        .copy-btn {
            position: absolute;
            top: 10px;
            right: 10px;
            padding: 8px 15px;
            background: rgba(255, 255, 255, 0.1);
            color: white;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            transition: var(--transition);
        }

        .copy-btn:hover {
            background: rgba(255, 255, 255, 0.2);
        }

        .notification {
            position: fixed;
            bottom: 20px;
            right: 20px;
            padding: 15px 25px;
            background: var(--success);
            color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            transform: translateY(100px);
            opacity: 0;
            transition: var(--transition);
            z-index: 1000;
        }

        .notification.show {
            transform: translateY(0);
            opacity: 1;
        }

        footer {
            text-align: center;
            padding: 30px 20px;
            color: var(--gray);
            font-size: 0.9rem;
            margin-top: 40px;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 40px;
        }

        .feature-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 25px;
            text-align: center;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }

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

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

        .feature-title {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--dark);
        }

        .feature-desc {
            color: var(--gray);
            font-size: 0.95rem;
        }

        .file-info {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 15px;
            margin-top: 15px;
        }

        .info-item {
            display: flex;
            justify-content: space-between;
            margin-bottom: 8px;
            font-size: 0.9rem;
        }

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

        .info-value {
            color: var(--gray);
        }

        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--gray);
        }

        .empty-state i {
            font-size: 3rem;
            margin-bottom: 15px;
            color: var(--gray-light);
        }

        .format-options {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 10px;
            margin-top: 10px;
        }

        .format-option {
            padding: 12px 10px;
            border: 2px solid var(--gray-light);
            border-radius: var(--border-radius);
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
        }

        .format-option:hover {
            border-color: var(--primary);
        }

        .format-option.active {
            border-color: var(--primary);
            background: rgba(67, 97, 238, 0.1);
        }

        .history-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
            gap: 15px;
            margin-top: 20px;
        }

        .history-item {
            height: 120px;
            border-radius: var(--border-radius);
            cursor: pointer;
            transition: var(--transition);
            position: relative;
            border: 2px solid transparent;
            background-size: cover;
            background-position: center;
        }

        .history-item:hover {
            transform: scale(1.05);
        }

        .history-item.active {
            border-color: var(--primary);
        }

        .history-delete {
            position: absolute;
            top: 5px;
            right: 5px;
            background: rgba(0, 0, 0, 0.7);
            color: white;
            border: none;
            border-radius: 50%;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            transition: var(--transition);
        }

        .history-item:hover .history-delete {
            opacity: 1;
        }

        .progress-bar {
            width: 100%;
            height: 6px;
            background: var(--gray-light);
            border-radius: 3px;
            margin-top: 10px;
            overflow: hidden;
            display: none;
        }

        .progress-fill {
            height: 100%;
            background: var(--success);
            width: 0%;
            transition: width 0.3s ease;
        }

        .compression-controls {
            display: grid;
            grid-template-columns: 1fr auto;
            gap: 15px;
            align-items: center;
        }

        .quality-value {
            min-width: 40px;
            text-align: center;
            font-weight: 600;
        }