* {
            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;
            padding: 20px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            overflow: hidden;
        }

        .header {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            color: white;
            text-align: center;
            padding: 40px 20px;
            position: relative;
        }

        .header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
            opacity: 0.3;
        }

        .header h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
            position: relative;
            z-index: 1;
        }

        .header p {
            font-size: 1.2rem;
            opacity: 0.9;
            position: relative;
            z-index: 1;
        }

        .main-content {
            padding: 40px;
        }

        .upload-section {
            background: #f8f9fa;
            border: 3px dashed #dee2e6;
            border-radius: 15px;
            padding: 40px;
            text-align: center;
            margin-bottom: 30px;
            transition: all 0.3s ease;
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }

        .upload-section::before {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            background: linear-gradient(45deg, #4facfe, #00f2fe, #4facfe);
            border-radius: 15px;
            opacity: 0;
            transition: opacity 0.3s ease;
            z-index: -1;
        }

        .upload-section:hover {
            border-color: #4facfe;
            background: #f0f8ff;
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(79, 172, 254, 0.2);
        }

        .upload-section.dragover {
            border-color: #00f2fe;
            background: #e6f7ff;
            transform: scale(1.02);
            box-shadow: 0 15px 35px rgba(0, 242, 254, 0.3);
        }

        .upload-section.dragover::before {
            opacity: 1;
        }

        .upload-icon {
            font-size: 4rem;
            color: #6c757d;
            margin-bottom: 20px;
            animation: bounce 2s infinite;
        }

        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
            40% { transform: translateY(-10px); }
            60% { transform: translateY(-5px); }
        }

        .upload-text {
            font-size: 1.3rem;
            color: #495057;
            margin-bottom: 15px;
            font-weight: 600;
        }

        .upload-info {
            color: #6c757d;
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .file-input {
            display: none;
        }

        .btn {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 25px;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            margin: 10px 5px;
            text-decoration: none;
            display: inline-block;
            position: relative;
            overflow: hidden;
        }

        .btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.5s;
        }

        .btn:hover::before {
            left: 100%;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 15px rgba(79, 172, 254, 0.4);
        }

        .btn:active {
            transform: translateY(0);
        }

        .optimization-section {
            background: linear-gradient(135deg, #fff3cd, #ffeaa7);
            border: 1px solid #ffeaa7;
            border-radius: 15px;
            padding: 25px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
        }

        .optimization-section::before {
            content: '⚡';
            position: absolute;
            top: -10px;
            right: -10px;
            font-size: 4rem;
            opacity: 0.1;
            transform: rotate(15deg);
        }

        .optimization-title {
            color: #856404;
            font-weight: bold;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 15px;
            font-size: 1.1rem;
        }

        .toggle-switch {
            position: relative;
            display: inline-block;
            width: 60px;
            height: 34px;
        }

        .toggle-switch input {
            opacity: 0;
            width: 0;
            height: 0;
        }

        .slider {
            position: absolute;
            cursor: pointer;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: #ccc;
            transition: .4s;
            border-radius: 34px;
        }

        .slider:before {
            position: absolute;
            content: "";
            height: 26px;
            width: 26px;
            left: 4px;
            bottom: 4px;
            background-color: white;
            transition: .4s;
            border-radius: 50%;
            box-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }

        input:checked + .slider {
            background: linear-gradient(135deg, #4facfe, #00f2fe);
        }

        input:checked + .slider:before {
            transform: translateX(26px);
        }

        .decode-section {
            background: linear-gradient(135deg, #f0f8ff, #e6f7ff);
            border: 2px solid #b3d9ff;
            border-radius: 15px;
            padding: 25px;
            margin-bottom: 30px;
            position: relative;
        }

        .decode-section::before {
            content: '🔍';
            position: absolute;
            top: -10px;
            right: -10px;
            font-size: 4rem;
            opacity: 0.1;
            transform: rotate(-15deg);
        }

        .decode-section h3 {
            color: #4facfe;
            margin-bottom: 15px;
            font-size: 1.3rem;
        }

        .base64-input-container textarea {
            width: 100%;
            padding: 15px;
            border: 2px solid #dee2e6;
            border-radius: 10px;
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
            resize: vertical;
            margin-bottom: 15px;
            transition: all 0.3s ease;
            background: white;
        }

        .base64-input-container textarea:focus {
            outline: none;
            border-color: #4facfe;
            box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.1);
            transform: scale(1.01);
        }

        .input-buttons {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .results-section {
            margin-top: 30px;
        }

        .image-result {
            background: white;
            border: 1px solid #dee2e6;
            border-radius: 15px;
            padding: 25px;
            margin-bottom: 20px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .image-result::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, #4facfe, #00f2fe);
            transition: left 0.8s ease;
        }

        .image-result:hover::before {
            left: 100%;
        }

        .image-result:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
        }

        .image-preview {
            display: flex;
            align-items: center;
            gap: 20px;
            margin-bottom: 15px;
        }

        .preview-img {
            max-width: 120px;
            max-height: 120px;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            transition: transform 0.3s ease;
        }

        .preview-img:hover {
            transform: scale(1.05);
        }

        .image-info {
            flex: 1;
        }

        .image-name {
            font-weight: bold;
            color: #495057;
            margin-bottom: 8px;
            font-size: 1.1rem;
        }

        .image-details {
            color: #6c757d;
            font-size: 0.9rem;
            line-height: 1.5;
        }

        .base64-output {
            background: #f8f9fa;
            border: 2px solid #dee2e6;
            border-radius: 10px;
            padding: 20px;
            margin-top: 15px;
            font-family: 'Courier New', monospace;
            font-size: 0.85rem;
            max-height: 200px;
            overflow-y: auto;
            word-break: break-all;
            position: relative;
            transition: all 0.3s ease;
        }

        .base64-output:hover {
            border-color: #4facfe;
            background: #f0f8ff;
        }

        .copy-btn {
            background: linear-gradient(135deg, #28a745, #20c997);
            font-size: 0.9rem;
            padding: 10px 25px;
            margin-top: 15px;
        }

        .copy-btn:hover {
            box-shadow: 0 8px 15px rgba(40, 167, 69, 0.4);
        }

        .copy-btn.copied {
            background: linear-gradient(135deg, #17a2b8, #20c997);
            animation: pulse 0.6s ease;
        }

        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }

        .progress-bar {
            width: 100%;
            height: 8px;
            background: #e9ecef;
            border-radius: 4px;
            overflow: hidden;
            margin: 15px 0;
            box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #4facfe, #00f2fe);
            width: 0%;
            transition: width 0.3s ease;
            border-radius: 4px;
            position: relative;
        }

        .progress-fill::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            bottom: 0;
            right: 0;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
            animation: shimmer 2s infinite;
        }

        @keyframes shimmer {
            0% { transform: translateX(-100%); }
            100% { transform: translateX(100%); }
        }

        .stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .stat-card {
            background: white;
            border: 1px solid #dee2e6;
            border-radius: 15px;
            padding: 25px;
            text-align: center;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .stat-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #4facfe, #00f2fe);
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
        }

        .stat-number {
            font-size: 2.2rem;
            font-weight: bold;
            color: #4facfe;
            margin-bottom: 8px;
            text-shadow: 0 2px 4px rgba(79, 172, 254, 0.2);
        }

        .stat-label {
            color: #6c757d;
            font-size: 0.95rem;
            font-weight: 500;
        }

        .decoded-result {
            margin-top: 20px;
            padding: 25px;
            background: white;
            border: 2px solid #28a745;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(40, 167, 69, 0.1);
            animation: fadeInUp 0.5s ease;
        }

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

        .decoded-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            flex-wrap: wrap;
            gap: 15px;
        }

        .decoded-header h4 {
            color: #28a745;
            margin: 0;
            font-size: 1.2rem;
        }

        .decoded-preview {
            display: flex;
            gap: 25px;
            align-items: flex-start;
            flex-wrap: wrap;
        }

        .decoded-preview img {
            max-width: 300px;
            max-height: 300px;
            border-radius: 10px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            border: 3px solid #dee2e6;
            transition: all 0.3s ease;
        }

        .decoded-preview img:hover {
            transform: scale(1.02);
            border-color: #28a745;
        }

        .decoded-info {
            flex: 1;
            min-width: 280px;
        }

        .info-item {
            display: flex;
            justify-content: space-between;
            padding: 12px 0;
            border-bottom: 1px solid #eee;
            transition: background 0.2s ease;
        }

        .info-item:hover {
            background: #f8f9fa;
            margin: 0 -15px;
            padding: 12px 15px;
            border-radius: 8px;
        }

        .info-label {
            font-weight: 600;
            color: #495057;
        }

        .info-value {
            color: #6c757d;
            font-family: 'Courier New', monospace;
        }

        .error-message {
            background: linear-gradient(135deg, #f8d7da, #f5c6cb);
            border: 2px solid #f5c6cb;
            color: #721c24;
            padding: 20px;
            border-radius: 10px;
            margin-top: 15px;
            animation: shake 0.5s ease;
            position: relative;
        }

        .error-message::before {
            content: '⚠️';
            position: absolute;
            top: 15px;
            left: 15px;
            font-size: 1.2rem;
        }

        .error-message {
            padding-left: 50px;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-5px); }
            75% { transform: translateX(5px); }
        }

        .browser-support {
            margin-top: 30px;
            padding: 25px;
            background: linear-gradient(135deg, #e7f3ff, #cce7ff);
            border-radius: 15px;
            border: 2px solid #b3d9ff;
        }

        .browser-support h3 {
            color: #4facfe;
            margin-bottom: 15px;
            text-align: center;
        }

        .browser-icons {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 20px;
            flex-wrap: wrap;
        }

        .browser-icon {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            background: white;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
            cursor: help;
        }

        .browser-icon:hover {
            transform: translateY(-3px) scale(1.1);
            box-shadow: 0 8px 20px rgba(0,0,0,0.2);
        }

        .notification {
            position: fixed;
            top: 20px;
            right: 20px;
            background: linear-gradient(135deg, #28a745, #20c997);
            color: white;
            padding: 15px 25px;
            border-radius: 10px;
            box-shadow: 0 8px 20px rgba(40, 167, 69, 0.3);
            z-index: 1000;
            animation: slideInRight 0.5s ease;
            display: none;
        }

        @keyframes slideInRight {
            from {
                transform: translateX(100%);
                opacity: 0;
            }
            to {
                transform: translateX(0);
                opacity: 1;
            }
        }

        .loading-spinner {
            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;
            margin-right: 10px;
        }

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

        .format-selector {
            display: flex;
            gap: 10px;
            margin: 15px 0;
            flex-wrap: wrap;
        }

        .format-btn {
            padding: 12px 20px;
            border: 2px solid #dee2e6;
            background: white;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 0.9rem;
            text-align: center;
            min-width: 140px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .format-btn small {
            font-size: 0.7rem;
            color: #6c757d;
            font-family: 'Courier New', monospace;
            opacity: 0.8;
            line-height: 1.2;
        }

        .format-btn.active {
            background: linear-gradient(135deg, #4facfe, #00f2fe);
            color: white;
            border-color: #4facfe;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(79, 172, 254, 0.3);
        }

        .format-btn.active small {
            color: rgba(255, 255, 255, 0.9);
        }

        .format-btn:hover {
            border-color: #4facfe;
            transform: translateY(-1px);
            box-shadow: 0 2px 8px rgba(79, 172, 254, 0.2);
        }

        @media (max-width: 768px) {
            .header h1 {
                font-size: 2rem;
            }
            
            .main-content {
                padding: 20px;
            }
            
            .image-preview {
                flex-direction: column;
                text-align: center;
            }

            .decoded-preview {
                flex-direction: column;
            }

            .stats {
                grid-template-columns: 1fr;
            }

            .browser-icons {
                gap: 15px;
            }

            .input-buttons {
                justify-content: center;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }