:root {
            --primary-color: #FFD700;
            --primary-hover: #F0E68C;
            --light-bg: #FFF8DC;
            --border-color: #F0E68C;
            --text-muted: #696969;
            --success-color: #FF8C00;
            --warning-color: #FFC107;
            --shadow: 0 0 20px rgba(0,0,0,0.1);
        }
        
        body {
            background-color: white;
            padding: 20px;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: #2F2F2F;
        }
        
        .container {
            max-width: 1200px;
            background-color: white;
            border-radius: 12px;
            box-shadow: var(--shadow);
            padding: 30px;
            margin: 30px auto;
            transition: all 0.3s ease;
        }
        
        h1 {
            color: var(--text-muted);;
            font-weight: 700;
            margin-bottom: 10px;
        }
        
        .lead {
            color: var(--text-muted);
            font-size: 1.1rem;
            margin-bottom: 30px;
        }
        
        .form-label {
            font-weight: 600;
            color: #2F2F2F;
            margin-bottom: 8px;
        }
        
        .form-control, .form-select {
            border-radius: 8px;
            border: 1px solid var(--border-color);
            padding: 10px 15px;
            transition: all 0.2s;
        }
        
        .form-control:focus, .form-select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.2rem rgba(255, 215, 0, 0.25);
        }
        
        .preview-container {
            display: flex;
            flex-wrap: wrap;
            gap: 25px;
            margin-top: 30px;
        }
        
        /* 图片预览区域布局 */
        .image-preview-section {
            margin-bottom: 30px;
        }
        
        .image-preview-section .preview-box {
            min-height: 400px;
            display: flex;
            flex-direction: column;
        }
        
        .image-preview-section .preview-box h5 {
            margin-bottom: 20px;
            flex-shrink: 0;
        }
        
        .image-preview-section .upload-container,
        .image-preview-section .result-preview-container {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            border: 2px dashed var(--border-color);
            border-radius: 12px;
            padding: 20px;
            background-color: var(--light-bg);
            transition: all 0.3s ease;
            min-height: 350px;
        }
        
        .image-preview-section .upload-container:hover {
            border-color: var(--primary-color);
            background-color: rgba(255, 215, 0, 0.05);
        }
        
        /* 结果预览容器使用与上传容器相同的样式 */
        
        .upload-container .upload-area h6 {
            color: #FF8C00;
            font-weight: 600;
            margin-bottom: 10px;
        }
        
        .upload-container .upload-area .small {
            font-size: 0.85rem;
            margin-bottom: 15px;
        }
        
        .placeholder-text {
            color: var(--text-muted);
            font-style: italic;
            text-align: center;
        }
        
        /* 图片预览优化样式 */
        .preview-image-container {
            position: relative;
            display: inline-block;
            max-width: 100%;
            overflow: visible;
        }

        .preview-image-container:hover {
            z-index: 10;
        }
        
        .image-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
            opacity: 0;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 0;
            pointer-events: none;
        }

        .preview-image-container:hover .image-overlay {
            opacity: 1;
            pointer-events: auto;
        }

        .preview-image-container:hover .image-overlay .overlay-actions {
            transform: translateY(0);
        }

        .overlay-actions {
            transform: translateY(10px);
            transition: transform 0.3s ease;
            display: flex;
            gap: 12px;
            background: rgba(0, 0, 0, 0.7);
            backdrop-filter: blur(10px);
            padding: 12px 16px;
            border-radius: 25px;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        .overlay-actions .btn {
            background: rgba(255, 255, 255, 0.95);
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
            transition: all 0.2s ease;
            font-size: 1.1rem;
        }

        .overlay-actions .btn:hover {
            background: var(--primary-color);
            color: #2F2F2F;
            transform: scale(1.1);
            border-color: var(--primary-color);
        }

        .overlay-actions .btn-crop {
            background: rgba(255, 215, 0, 0.95);
            color: #2F2F2F;
        }

        .overlay-actions .btn-reupload {
            background: rgba(255, 140, 0, 0.95);
            color: white;
        }

        .overlay-actions .btn-delete {
            background: rgba(220, 53, 69, 0.95);
            color: white;
        }
        
        .preview-info {
            margin-top: 15px;
            text-align: center;
        }
        
        .preview-actions-below {
            display: flex;
            justify-content: center;
            gap: 10px;
        }
        
        .preview-actions-below .btn {
            border-radius: 20px;
            padding: 8px 16px;
            font-size: 0.9rem;
        }
        
        /* 下载区域预览样式 */
        .download-section-preview {
            margin-top: 20px;
            text-align: center;
            padding: 20px;
            background: linear-gradient(135deg, var(--success-color), #FFD700);
            border-radius: 12px;
            color: #2F2F2F;
        }
        
        .download-section-preview .btn-success {
            background: rgba(255, 255, 255, 0.2);
            border: 2px solid rgba(255, 255, 255, 0.8);
            color: #2F2F2F;
            backdrop-filter: blur(10px);
        }

        .download-section-preview .btn-success:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        
        .download-options {
            margin-top: 15px;
        }
        
        .download-options .btn-outline-secondary {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.5);
            color: #2F2F2F;
            border-radius: 20px;
        }

        .download-options .btn-outline-secondary:hover {
            background: rgba(255, 255, 255, 0.2);
            color: #2F2F2F;
        }
        
        /* 设置区域样式 */
        .settings-section {
            margin-bottom: 30px;
        }
        
        .preview-box {
            flex: 1;
            min-width: 300px;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 20px;
            text-align: center;
            transition: all 0.3s ease;
            background-color: #fff;
        }
        
        .preview-box:hover {
            box-shadow: 0 5px 15px rgba(255, 215, 0, 0.15);
            transform: translateY(-3px);
        }
        
        .preview-box h5 {
            color: #FF8C00;
            font-weight: 600;
            margin-bottom: 15px;
        }
        
        .preview-image {
            width: 100%;
            height: 100%;
            object-fit: cover;
            margin-top: 10px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
        }
        
        .preview-image:hover {
            transform: scale(1.02);
        }
        
        .loading-spinner {
            display: none;
            margin: 30px auto;
            text-align: center;
        }

        /* Progress bar styling */
        .progress-bar {
            background-color: var(--primary-color);
            background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);
            background-size: 1rem 1rem;
        }

        .progress-bar-striped {
            background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);
        }

        .progress-bar-animated {
            animation: progress-bar-stripes 1s linear infinite;
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            border-radius: 8px;
            padding: 12px 24px;
            font-weight: 600;
            transition: all 0.3s ease;
            color: #2F2F2F;
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
            border-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(255, 215, 0, 0.3);
            color: #2F2F2F;
        }

        .btn-primary:disabled {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            color: #2F2F2F;
            opacity: 0.8;
        }

        /* 伪禁用：保持可点击用于指引，但视觉上变淡 */
        .btn[aria-disabled="true"] {
            opacity: 0.6;
        }

        .btn-primary:disabled:hover {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            transform: none;
            box-shadow: none;
        }
        
        .btn-success {
            background-color: var(--success-color);
            border-color: var(--success-color);
            border-radius: 8px;
            padding: 12px 24px;
            font-weight: 600;
            transition: all 0.3s ease;
            color: white;
        }

        .btn-warning {
            background-color: var(--warning-color);
            border-color: var(--warning-color);
            border-radius: 8px;
            padding: 12px 24px;
            font-weight: 600;
            transition: all 0.3s ease;
            color: #2F2F2F;
        }

        .btn-warning:hover {
            filter: brightness(1.05);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(255, 193, 7, 0.3);
        }

        .btn-outline-primary {
            color: #FF8C00;
            border-color: #FF8C00;
            border-radius: 8px;
            padding: 12px 24px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .btn-outline-primary:hover {
            background-color: var(--primary-color);
            color: #2F2F2F;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(255, 215, 0, 0.3);
        }
        
        .btn-success:hover {
            background-color: #F0E68C;
            border-color: #F0E68C;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(240, 230, 140, 0.3);
            color: #2F2F2F;
        }

        /* 统一三按钮尺寸外观 */
        .btn-action {
            min-width: 140px;
            margin: 0 4px;
        }
        
        .alert {
            margin-top: 20px;
            border-radius: 8px;
            padding: 15px 20px;
        }

        /* 仅默认隐藏全局错误提示框，其它 Bootstrap alert 正常显示 */
        #errorMessage {
            display: none;
        }
        
        .prompt-section {
            background-color: var(--light-bg);
            border-radius: 12px;
            padding: 25px;
            margin-bottom: 25px;
            box-shadow: 0 2px 8px rgba(255, 215, 0, 0.08);
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 兑换码区域高亮效果 */
        .prompt-section.highlight {
            animation: highlight-pulse 1.2s ease-out;
            box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.5), 0 6px 18px rgba(255, 215, 0, 0.25);
        }

        @keyframes highlight-pulse {
            0% { box-shadow: 0 0 0 0 rgba(255, 215, 0, 0.0); }
            30% { box-shadow: 0 0 0 6px rgba(255, 215, 0, 0.35); }
            100% { box-shadow: 0 0 0 0 rgba(255, 215, 0, 0.0); }
        }
        
        .prompt-section h4 {
            color: #FF8C00;
            font-weight: 600;
            margin-bottom: 15px;
        }
        
        .nav-tabs {
            border-bottom: 2px solid var(--border-color);
            margin-bottom: 20px;
        }
        
        .nav-tabs .nav-link {
            border-radius: 8px 8px 0 0;
            border: none;
            color: var(--text-muted);
            font-weight: 500;
            padding: 10px 20px;
            transition: all 0.2s;
        }
        
        .nav-tabs .nav-link:hover {
            border: none;
            color: var(--primary-color);
            background-color: rgba(255, 215, 0, 0.05);
        }

        .nav-tabs .nav-link.active {
            color: #FF8C00;
            background-color: white;
            border-bottom: 3px solid var(--primary-color);
        }
        
        .tab-content {
            background-color: white;
            border-radius: 0 0 12px 12px;
            padding: 20px;
            box-shadow: 0 2px 8px rgba(255, 215, 0, 0.08);
        }
        
        .prompt-category {
            margin-bottom: 20px;
        }
        
        .prompt-category h5 {
            color: #696969;
            font-weight: 600;
            margin-bottom: 12px;
            font-size: 1.1rem;
        }
        
        .prompt-tag {
            display: inline-block;
            background-color: #F5F5F5;
            border-radius: 20px;
            padding: 8px 15px;
            margin: 5px;
            cursor: pointer;
            font-size: 0.9rem;
            transition: all 0.2s;
            border: 1px solid transparent;
        }
        
        .prompt-tag:hover {
            background-color: rgba(255, 215, 0, 0.1);
            color: #FF8C00;
            border-color: var(--primary-color);
            transform: translateY(-2px);
        }

        .prompt-tag.active {
            background-color: var(--primary-color);
            color: #2F2F2F;
            box-shadow: 0 3px 8px rgba(255, 215, 0, 0.3);
        }
        
        .custom-prompt {
            width: 100%;
            min-height: 120px;
            margin-top: 15px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            padding: 15px;
            transition: all 0.2s;
        }
        
        .custom-prompt:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.2rem rgba(255, 215, 0, 0.25);
        }
        
        .advanced-settings {
            margin-top: 25px;
            padding: 20px;
            background-color: var(--light-bg);
            border-radius: 12px;
            box-shadow: 0 2px 8px rgba(255, 215, 0, 0.08);
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .advanced-settings h5 {
            color: #FF8C00;
            font-weight: 600;
            margin-bottom: 20px;
        }

        /* 设置项标签样式优化 */
        .setting-item label {
            font-weight: 600;
            color: #2F2F2F;
            margin-bottom: 12px;
            display: block;
        }

        .setting-item .d-flex {
            margin-top: 10px;
        }

        .setting-item small {
            color: var(--text-muted);
            font-size: 0.8rem;
        }

        /* 高亮显示滑块当前值 */
        #temperatureValue,
        #topPValue {
            color: #FF8C00;
            font-weight: 600;
        }
        
        .setting-item {
            margin-bottom: 25px;
            padding: 20px;
            background: white;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            transition: all 0.2s ease;
        }

        .setting-item:hover {
            box-shadow: 0 4px 12px rgba(255, 215, 0, 0.12);
            transform: translateY(-2px);
        }

        .form-range {
            height: 10px;
            background: #F5F5F5;
            border-radius: 5px;
            outline: none;
            transition: all 0.2s ease;
        }
        
        .form-range::-webkit-slider-thumb {
            width: 20px;
            height: 20px;
            background-color: var(--primary-color);
            border: 3px solid white;
            border-radius: 50%;
            cursor: pointer;
            box-shadow: 0 2px 8px rgba(255, 215, 0, 0.3);
            transition: all 0.2s ease;
        }

        .form-range::-webkit-slider-thumb:hover {
            transform: scale(1.2);
            box-shadow: 0 3px 12px rgba(255, 215, 0, 0.4);
        }
        
        .form-range::-moz-range-thumb {
            width: 20px;
            height: 20px;
            background-color: var(--primary-color);
            border: 3px solid white;
            border-radius: 50%;
            cursor: pointer;
            box-shadow: 0 2px 8px rgba(255, 215, 0, 0.3);
            transition: all 0.2s ease;
        }

        .form-range::-moz-range-thumb:hover {
            transform: scale(1.2);
            box-shadow: 0 3px 12px rgba(255, 215, 0, 0.4);
        }
        
        .token-usage {
            margin-top: 20px;
            padding: 15px;
            background-color: #F5F5F5;
            border-radius: 8px;
            text-align: center;
            font-weight: 500;
        }
        
        .example-section {
            margin-top: 25px;
            padding: 20px;
            background-color: rgba(255, 215, 0, 0.05);
            border-radius: 12px;
            border-left: 5px solid var(--primary-color);
            box-shadow: 0 2px 8px rgba(255, 215, 0, 0.08);
        }
        
        .example-section h5 {
            color: #FF8C00;
            font-weight: 600;
            margin-bottom: 15px;
        }
        
        .example-section strong {
            color: #2F2F2F;
        }
        
        .d-grid {
            margin-top: 30px;
        }
        
        /* 上传区域样式 */
        .upload-section {
            margin-bottom: 30px;
        }
        
        .upload-container {
            border: 2px dashed var(--border-color);
            border-radius: 12px;
            padding: 40px 20px;
            background-color: var(--light-bg);
            transition: all 0.3s ease;
            cursor: pointer;
        }
        
        .upload-container:hover {
            border-color: var(--primary-color);
            background-color: rgba(255, 215, 0, 0.05);
        }
        
        .upload-container.dragover {
            border-color: var(--primary-color);
            background-color: rgba(255, 215, 0, 0.1);
        }
        
        .upload-area {
            text-align: center;
        }
        
        .upload-icon {
            margin-bottom: 15px;
        }
        
        .image-preview {
            text-align: center;
            position: relative;
            width: 100%;
            height: 100%;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .image-preview img {
            max-width: 100%;
            max-height: 400px;
            width: auto;
            height: auto;
            object-fit: contain;
            box-shadow: 0 5px 15px rgba(255, 215, 0, 0.2);
        }

        /* Preview image container */
        .preview-image-container {
            position: relative;
            width: 100%;
            height: 400px;
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: #FFF8DC;
            overflow: visible;
        }

        .preview-image-container:hover {
            z-index: 10;
        }

        .preview-image-container img {
            max-width: 100%;
            max-height: 100%;
            width: auto;
            height: auto;
            object-fit: contain;
            box-shadow: 0 5px 15px rgba(255, 215, 0, 0.2);
            /* 保持原始比例，不改变实际大小，只进行显示缩放 */
        }

        /* 移除复杂的预览容器样式，使用与上传容器相同的样式 */
        
        .preview-actions {
            margin-top: 15px;
            display: flex;
            justify-content: center;
            gap: 10px;
        }
        
        /* 响应式设计优化 */
        @media (max-width: 768px) {
            .container {
                padding: 20px;
                margin-top: 20px;
            }
            
            h1 {
                font-size: 1.8rem;
            }
            
            .preview-box {
                min-width: 100%;
            }
            
            .nav-tabs .nav-link {
                padding: 8px 12px;
                font-size: 0.9rem;
            }
            
            /* 移动端图片预览区域上下布局 */
            .image-preview-section .preview-box {
                min-height: auto;
                margin-bottom: 20px;
            }
            
            .image-preview-section .upload-container,
            .image-preview-section .result-preview-container {
                min-height: 200px;
                padding: 20px;
            }
            
            .upload-container .upload-icon i {
                font-size: 2rem !important;
            }
            
            .upload-container .upload-area h6 {
                font-size: 1rem;
            }
        }
        
        /* 中等屏幕优化 */
        @media (min-width: 769px) and (max-width: 992px) {
            .image-preview-section .preview-box {
                min-height: 350px;
            }
            
            .image-preview-section .upload-container,
            .image-preview-section .result-preview-container {
                min-height: 250px;
                padding: 20px;
            }
        }
        
        /* 动画效果 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .preview-box {
            animation: fadeIn 0.5s ease-out;
        }

        /* Progress bar animation */
        @keyframes progress-bar-stripes {
            0% {
                background-position: 1rem 0;
            }
            100% {
                background-position: 0 0;
            }
        }