* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #4361ee;
            --primary-light: #eef2ff;
            --secondary-color: #3f37c9;
            --download-color: #ffc107;
            --download-hover-color: #ffa000;
            --dark-color: #1e293b;
            --light-color: #f8fafc;
            --gray-color: #94a3b8;
            --success-color: #10b981;
            --border-radius: 12px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }

        body {
            background: #f4f4f9;
            color: #333;
            min-height: 100vh;
            padding: 20px;
            justify-content: center;
            align-items: center;
        }


        /* 导航栏样式 */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: white;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            z-index: 1000;
            padding: 15px 20px;
        }

        .navbar-container {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .navbar-logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
            display: flex;
            align-items: center;
        }

        .navbar-logo i {
            margin-right: 8px;
        }

        .navbar-menu {
            display: flex;
            list-style: none;
        }

        .navbar-item {
            margin-left: 25px;
        }

        .navbar-link {
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 500;
            padding: 8px 0;
            position: relative;
            transition: color 0.3s ease;
        }

        .navbar-link:hover {
            color: var(--primary-color);
        }

        .navbar-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background-color: var(--primary-color);
            transition: width 0.3s ease;
        }

        .navbar-link:hover::after {
            width: 100%;
        }

        .navbar-link.active {
            color: var(--primary-color);
        }

        .navbar-link.active::after {
            width: 100%;
        }

        /* 移动端菜单按钮 */
        .navbar-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1.5rem;
            color: var(--dark-color);
        }

        @media (max-width: 768px) {
            .navbar-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: white;
                box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
                flex-direction: column;
                padding: 15px 20px;
            }

            .navbar-item {
                margin-left: 0;
                margin-bottom: 15px;
            }

            .navbar-toggle {
                display: block;
            }

            .navbar-menu.active {
                display: flex;
            }
        }

        .container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 20px;
        }

        header {
            text-align: center;
            padding: 25px 20px;
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 10px;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            background-clip: text;
            margin-bottom: 10px;
            margin-top: 2rem;
            color: #3f51b5;
        }

        .subtitle {
            font-size: 1.2rem;
            opacity: 0.8;
        }

        .upload-area {
            background: #f9f9f9;
            border: 2px dashed #ccc;
            border-radius: 10px;
            padding: 40px 30px;
            text-align: center;
            margin: 30px;
            transition: all 0.3s ease;
            height: auto;
            /* 修改为自动高度 */
        }

        .upload-area.active {
            background: #e0f7fa;
            border-color: #29b6f6;
        }

        /* 新增已上传状态的样式 */
        .upload-area.uploaded {
            padding: 20px 30px;
            height: 120px;
            /* 缩小后的高度 */
            overflow: hidden;
        }

        /* 隐藏上传区域中的部分元素 */
        .upload-area.uploaded .upload-icon,
        .upload-area.uploaded .upload-instructions {
            display: none;
        }

        /* 调整上传文本样式 */
        .upload-area.uploaded .upload-text {
            margin-bottom: 10px;
            font-size: 1.1rem;
        }

        /* 调整上传按钮样式 */
        .upload-area.uploaded .upload-btn {
            padding: 8px 25px;
            font-size: 1rem;
        }

        .upload-icon {
            font-size: 3rem;
            color: #29b6f6;
            margin-bottom: 20px;
        }

        .upload-text {
            font-size: 1.3rem;
            margin-bottom: 15px;
            font-weight: 500;
        }

        .upload-instructions {
            color: #777;
            font-size: 1rem;
            margin-bottom: 25px;
        }

        .upload-instructions span {
            background: #e0f7fa;
            padding: 3px 8px;
            border-radius: 4px;
            margin: 0 5px;
        }

        .upload-btn {
            background: #29b6f6;
            color: white;
            border: none;
            padding: 12px 35px;
            font-size: 1.1rem;
            border-radius: 30px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .upload-btn:hover {
            background: #039be5;
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(0, 0, 0, 0.1);
        }

        #file-input {
            display: none;
        }

        .comparison-area {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            padding: 0 30px 30px;
            flex-grow: 1;
        }

        .image-container {
            flex: 1;
            min-width: 300px;
            background: #f9f9f9;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }

        .image-container h3 {
            background: #eee;
            margin: 0;
            padding: 15px 20px;
            text-align: center;
            font-size: 1.2rem;
            border-bottom: 1px solid #ddd;
            position: relative;
            /* 添加相对定位 */
        }

        /* 新增清除按钮样式 */
        .clear-btn {
            position: absolute;
            top: 50%;
            right: 15px;
            transform: translateY(-50%);
            background: transparent;
            border: none;
            color: #dd2222;
            cursor: pointer;
            opacity: 0.7;
            transition: opacity 0.2s, transform 0.2s;
            display: none;
            /* 默认隐藏 */
        }

        .clear-btn:hover {
            opacity: 1;
            transform: translateY(-50%) scale(1.1);
        }

        .clear-btn:active {
            transform: translateY(-50%) scale(0.95);
        }

		/* 使用示例按钮样式 */
        .demo-btn {
            position: absolute;
            top: 50%;
            right: 65px;
            transform: translateY(-50%);
            background: transparent;
            border: none;
            color: #1924c5;
            cursor: pointer;
            opacity: 0.7;
            transition: opacity 0.2s, transform 0.2s;
            /* 默认显示 */
        }

        .demo-btn:hover {
            opacity: 1;
            transform: translateY(-50%) scale(1.1);
        }

        .demo-btn:active {
            transform: translateY(-50%) scale(0.95);
        }

        .image-preview {
            height: 400px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
            position: relative;
            overflow: hidden;
        }

        .image-preview img {
            max-width: 100%;
            max-height: 100%;
            object-fit: contain;
            display: none;
            transition: opacity 0.5s ease;
            cursor: pointer; /* 添加鼠标指针样式 */
        }

        .placeholder {
            color: #777;
            text-align: center;
            padding: 20px;
        }

        .placeholder i {
            font-size: 3rem;
            margin-bottom: 20px;
            display: block;
            color: #999;
        }

        .controls {
            display: flex;
            justify-content: center;
            gap: 25px;
            padding: 0 30px 40px;
            flex-wrap: wrap;
        }

        .control-btn {
            min-width: 200px;
            padding: 15px 30px;
            font-size: 1.1rem;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            transition: all 0.3s;
            font-weight: 600;
            border: none;
            cursor: pointer;
        }

        .process-btn {
            background: #4caf50;
            color: white;
        }

        .process-btn:hover {
            background: #388e3c;
            transform: translateY(-3px);
            box-shadow: 0 7px 20px rgba(0, 0, 0, 0.1);
        }

        .gray-btn {
            background: #dd6e0e;
            color: white;
        }

        .gray-btn:hover {
            background: #ff7b09;
            transform: translateY(-3px);
            box-shadow: 0 7px 20px rgba(0, 0, 0, 0.1);
        }

        .white-black-btn {
            background: #5c4e68;
            color: white;
        }

        .white-black-btn:hover {
            background: #28212e;
            transform: translateY(-3px);
            box-shadow: 0 7px 20px rgba(0, 0, 0, 0.1);
        }

        .download-btn {
            background: #ffc107;
            color: #212529;
        }

        .download-btn:hover {
            background: #ffa000;
            transform: translateY(-3px);
            box-shadow: 0 7px 20px rgba(0, 0, 0, 0.1);
        }

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

        .error-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.85);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            z-index: 1000;
            display: none;
        }

        .error-content {
            background: #fff;
            padding: 40px;
            border-radius: 15px;
            text-align: center;
            max-width: 500px;
            width: 90%;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
        }

        .error-icon {
            font-size: 3.5rem;
            color: #ff6b6b;
            margin-bottom: 25px;
        }

        .retry-btn {
            background: #29b6f6;
            color: white;
            border: none;
            padding: 12px 35px;
            font-size: 1.1rem;
            border-radius: 30px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 500;
            margin-top: 20px;
        }

        .retry-btn:hover {
            background: #039be5;
            transform: translateY(-3px);
        }

        @media (max-width: 768px) {
            .upload-area {
                margin: 20px;
                padding: 30px 20px;
            }

            .upload-area.uploaded {
                padding: 15px 20px;
                height: 100px;
            }

            .comparison-area {
                padding: 0 20px 20px;
                gap: 20px;
            }

            .controls {
                padding: 0 20px 30px;
                gap: 15px;
            }

            .control-btn {
                min-width: 100%;
            }

            h1 {
                font-size: 2.2rem;
            }

            .upload-text {
                font-size: 1.2rem;
            }

            /* 移动设备上的清除按钮样式调整 */
            .clear-btn {
                right: 10px;
                font-size: 0.9rem;
            }
        }

        .hidden {
            display: none;
        }

        /* 新增处理动画样式 */
        .processing-container {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            background: rgba(255, 255, 255, 0.9);
            z-index: 10;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s ease;
        }

        .processing-container.active {
            opacity: 1;
            visibility: visible;
        }

        .processing-spinner {
            width: 50px;
            height: 50px;
            border: 4px solid #f3f3f3;
            border-top: 4px solid #3498db;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-bottom: 20px;
        }

        .processing-text {
            color: #555;
            font-size: 1.2rem;
            font-weight: 500;
        }

        /* 线稿提取动画 */
        @keyframes spin {
            0% {
                transform: rotate(0deg);
            }

            100% {
                transform: rotate(360deg);
            }
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
            }

            to {
                opacity: 1;
            }
        }

        @keyframes zoomIn {
            from {
                transform: scale(0.95);
                opacity: 0;
            }

            to {
                transform: scale(1);
                opacity: 1;
            }
        }

        @keyframes scanEffect {
            0% {
                transform: translateY(-100%);
                background: rgba(76, 175, 80, 0.2);
            }

            50% {
                background: rgba(76, 175, 80, 0.4);
            }

            100% {
                transform: translateY(100%);
                background: rgba(76, 175, 80, 0.2);
            }
        }

        .scan-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 10%;
            background: rgba(76, 175, 80, 0.2);
            animation: scanEffect 1.5s linear infinite;
            pointer-events: none;
            z-index: 5;
            display: none;
            /* 默认隐藏扫描效果 */
        }

        .image-preview.loading img {
            opacity: 0.6;
        }

        /* 新增版权区域样式 */
        footer {
            border-top: 1px solid #e9ecef;
            padding: 20px;
            text-align: center;
            color: #6c757d;
            font-size: 0.9rem;
        }

        .footer-links {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: #6c757d;
            text-decoration: none;
            margin: 0 10px;
        }

        .footer-links a:hover {
            text-decoration: underline;
        }

        .copyright {
            margin-top: 10px;
        }

        /* 新增图片预览弹窗样式 */
        .preview-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.85);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
            display: none;
        }

        .preview-container {
            position: relative;
            max-width: 90%;
            max-height: 90%;
        }

        .preview-image {
            max-width: 100%;
            max-height: 100%;
            object-fit: contain;
        }

        .preview-controls {
            position: absolute;
            bottom: 10px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            gap: 10px;
        }

        .preview-control-btn {
            background: #fff;
            color: #333;
            border: none;
            padding: 8px 15px;
            font-size: 1rem;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .preview-control-btn:hover {
            background: #eee;
        }