* {
            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;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: flex-start;
            padding: 20px;
        }

        .container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            padding: 40px;
            max-width: 800px;
            width: 100%;
            position: relative;
            overflow: hidden;
        }

        .container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #667eea, #764ba2);
        }

        h1 {
            color: #333;
            margin-bottom: 10px;
            font-size: 2.2em;
            font-weight: 700;
        }

        .subtitle {
            color: #666;
            margin-bottom: 30px;
            font-size: 1.1em;
        }

        .notice {
            padding: 14px 16px;
            border-radius: 10px;
            border: 1px solid #b7e4c7;
            background: #eefbf3;
            color: #1b4332;
            margin-bottom: 24px;
            font-size: 0.98em;
            line-height: 1.5;
        }

        .upload-area {
            border: 3px dashed #667eea;
            border-radius: 15px;
            padding: 40px;
            text-align: center;
            margin-bottom: 30px;
            transition: all 0.3s ease;
            position: relative;
            background: #f8f9ff;
        }

        .upload-area:hover, .upload-area.dragover {
            border-color: #764ba2;
            background: #f0f2ff;
            transform: translateY(-2px);
        }

        .upload-icon {
            font-size: 3em;
            color: #667eea;
            margin-bottom: 20px;
        }

        .upload-text {
            font-size: 1.2em;
            color: #333;
            margin-bottom: 10px;
        }

        .upload-hint {
            color: #666;
            font-size: 0.9em;
        }

        input[type="file"] {
            display: none;
        }

        .btn {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1em;
            transition: all 0.3s ease;
            margin: 10px 5px;
            text-decoration: none;
            display: inline-block;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }

        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .options {
            margin: 30px 0;
            padding: 20px;
            background: #f8f9ff;
            border-radius: 12px;
        }

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

        .option-title {
            font-weight: 600;
            color: #333;
            margin-bottom: 10px;
        }

        .radio-group {
            display: flex;
            gap: 20px;
            margin-bottom: 15px;
        }

        .radio-option {
            display: flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
        }

        .sizes-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
            gap: 10px;
            margin-top: 10px;
        }

        .size-checkbox {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px;
            background: white;
            border-radius: 6px;
            cursor: pointer;
            transition: background 0.3s ease;
        }

        .size-checkbox:hover {
            background: #e8ebff;
        }

        .preview-area {
            margin: 20px 0;
            padding: 20px;
            background: #f8f9ff;
            border-radius: 12px;
            display: none;
        }

        .preview-title {
            font-weight: 600;
            color: #333;
            margin-bottom: 15px;
        }

        .preview-image {
            max-width: 200px;
            max-height: 200px;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }

        .preview-info {
            margin-top: 15px;
            color: #666;
        }

        .download-area {
            margin-top: 30px;
            text-align: center;
            display: none;
        }

        .progress-bar {
            width: 100%;
            height: 6px;
            background: #e0e0e0;
            border-radius: 3px;
            overflow: hidden;
            margin: 20px 0;
            display: none;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #667eea, #764ba2);
            width: 0%;
            transition: width 0.3s ease;
        }

        .status-message {
            padding: 10px 15px;
            border-radius: 6px;
            margin: 10px 0;
            display: none;
        }

        .status-success {
            background: #d4edda;
            color: #155724;
            border: 1px solid #c3e6cb;
        }

        .status-error {
            background: #f8d7da;
            color: #721c24;
            border: 1px solid #f5c6cb;
        }

        .download-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
            align-items: center;
            margin-top: 20px;
        }

        .footer {
            text-align: center;
            padding: 20px;
            color: #999;
            font-size: 0.9em;
            margin-top: 30px;
            width: 100%;
            max-width: 800px;
        }

        .footer a {
            color: #667eea;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .footer a:hover {
            color: #764ba2;
            text-decoration: underline;
        }

        @media (max-width: 768px) {
            .footer {
                font-size: 0.85em;
                margin-top: 20px;
                padding: 15px;
            }
        }