/* Original tool presentation, scoped to this detail page. */

        #yk-portal-v2 .yk-legacy-tool {
             padding-top: 70px; /* 调整此值以匹配导航栏高度 */
             background-color: #f8f9fa; /* 淡灰色背景 */
             font-family: 'Poppins', 'Nunito', sans-serif; /* 优先使用 Poppins 字体 */
        }

        /* 主色调来源于logo，假设是蓝色系 */
        #yk-portal-v2 .yk-legacy-tool {
            --primary-color: #2563EB; /* 主要蓝色 - 根据实际logo颜色调整 */
            --secondary-color: #1E40AF; /* 深蓝色 - 根据实际logo颜色调整 */
            --accent-color: #3B82F6; /* 亮蓝色 - 根据实际logo颜色调整 */
            --nav-bg-color: rgba(13, 25, 49, 0.85); /* 深蓝背景 - 根据实际logo颜色调整 */
            --section-bg-light: #ffffff; /* 浅色区域背景 */
            --section-bg-dark: #f1f5f9; /* 稍深区域背景 */
            --text-color-dark: #333;
            --text-color-light: #666;
            --heading-color: #1E40AF; /* 深蓝标题 */
        }

        #yk-portal-v2 .yk-legacy-tool .navbar {
            background-color: var(--nav-bg-color);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            padding: 10px 0;
            transition: all 0.4s ease;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
            position: fixed; /* 使导航栏固定在顶部 */
            width: 100%;
            top: 0;
            z-index: 1030;
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-scrolled {
            padding: 8px 0;
            background-color: rgba(13, 25, 49, 0.95);
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-brand {
            display: flex;
            align-items: center;
            padding: 0;
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-brand img {
            height: 40px;
            transition: all 0.3s ease;
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-scrolled .navbar-brand img {
            height: 36px;
        }

        #yk-portal-v2 .yk-legacy-tool .brand-text {
            color: rgba(255, 255, 255, 0.95);
            font-weight: 700;
            font-size: 1.5rem;
            margin-left: 10px;
            transition: all 0.3s ease;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-scrolled .brand-text {
            font-size: 1.3rem;
        }

        #yk-portal-v2 .yk-legacy-tool .nav-item {
            position: relative;
            margin: 0 5px;
        }

        #yk-portal-v2 .yk-legacy-tool .nav-link {
            font-weight: 600;
            position: relative;
            padding: 10px 0 !important;
            margin: 0 15px;
            text-transform: uppercase;
            font-size: 14px;
            letter-spacing: 1px;
            transition: all 0.3s ease;
            color: rgba(255, 255, 255, 0.9) !important;
        }

        #yk-portal-v2 .yk-legacy-tool .nav-link:before {
            content: "";
            position: absolute;
            width: 5px;
            height: 5px;
            border-radius: 50%;
            bottom: 0;
            left: 50%;
            background-color: var(--accent-color);
            transform: translateX(-50%) scale(0);
            transition: transform 0.3s ease;
        }

        #yk-portal-v2 .yk-legacy-tool .nav-link:hover:before,#yk-portal-v2 .yk-legacy-tool 
        .nav-item.active .nav-link:before {
            transform: translateX(-50%) scale(1);
        }

        #yk-portal-v2 .yk-legacy-tool .nav-item.active .nav-link {
            color: var(--accent-color) !important;
            text-shadow: 0 0 10px rgba(59, 130, 246, 0.3);
        }

        #yk-portal-v2 .yk-legacy-tool .nav-item:hover .nav-link {
            color: #fff !important;
            transform: translateY(-3px);
            text-shadow: 0 0 15px rgba(255, 255, 255, 0.5);
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler {
            border: none;
            outline: none;
            padding: 0;
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler-icon {
            background-image: none;
            position: relative;
            width: 24px;
            height: 17px;
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler-icon:before,#yk-portal-v2 .yk-legacy-tool 
        .navbar-dark .navbar-toggler-icon:after,#yk-portal-v2 .yk-legacy-tool 
        .navbar-dark .navbar-toggler-icon span {
            width: 100%;
            height: 2px;
            background-color: #fff;
            border-radius: 3px;
            position: absolute;
            left: 0;
            transition: all .3s ease;
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler-icon:before,#yk-portal-v2 .yk-legacy-tool 
        .navbar-dark .navbar-toggler-icon:after {
            content: '';
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler-icon:before {
            top: 0;
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler-icon span {
            top: 50%;
            transform: translateY(-50%);
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler-icon:after {
            bottom: 0;
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler[aria-expanded="true"] .navbar-toggler-icon:before {
            transform: translateY(7px) rotate(45deg);
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler[aria-expanded="true"] .navbar-toggler-icon:after {
            transform: translateY(-7px) rotate(-45deg);
        }

        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler[aria-expanded="true"] .navbar-toggler-icon span {
            opacity: 0;
        }

        @media (max-width: 991px) {
            #yk-portal-v2 .yk-legacy-tool {
                 padding-top: 60px; /* 调整移动端导航栏高度 */
            }
            #yk-portal-v2 .yk-legacy-tool .navbar-collapse {
                background-color: rgba(13, 25, 49, 0.98);
                padding: 20px;
                border-radius: 10px;
                margin-top: 15px;
                box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            }

            #yk-portal-v2 .yk-legacy-tool .navbar-nav .nav-item {
                margin: 5px 0;
            }

            #yk-portal-v2 .yk-legacy-tool .navbar-brand img {
                height: 36px;
            }

            #yk-portal-v2 .yk-legacy-tool .brand-text {
                font-size: 1.3rem;
            }
        }

        @media (max-width: 575px) {
            #yk-portal-v2 .yk-legacy-tool .navbar-brand img {
                height: 32px;
            }

            #yk-portal-v2 .yk-legacy-tool .brand-text {
                font-size: 1.2rem;
            }
        }

        /* 页面特定样式 */
        #yk-portal-v2 .yk-legacy-tool .page-header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 60px 0;
            text-align: center;
            margin-bottom: 40px;
            border-bottom: 5px solid var(--accent-color);
            margin-top: -70px; /* 抵消 body 的 padding-top */
            padding-top: 130px; /* 增加顶部内边距以适应固定的导航栏 */
        }
        #yk-portal-v2 .yk-legacy-tool .page-header h1 {
            font-size: 2.8rem;
            font-weight: 700;
            text-shadow: 1px 1px 5px rgba(0,0,0,0.3);
        }
        #yk-portal-v2 .yk-legacy-tool .page-header p {
            font-size: 1.2rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 15px auto 0;
        }

        #yk-portal-v2 .yk-legacy-tool .section {
            padding: 60px 0;
            border-bottom: 1px solid #eee;
        }
        #yk-portal-v2 .yk-legacy-tool .section:nth-child(odd) {
             background-color: var(--section-bg-light); /* 白色背景 */
        }
        #yk-portal-v2 .yk-legacy-tool .section:nth-child(even) {
             background-color: var(--section-bg-dark); /* 浅灰色背景 */
        }
        #yk-portal-v2 .yk-legacy-tool .section:last-of-type {
            border-bottom: none;
        }

        #yk-portal-v2 .yk-legacy-tool .section-title {
            text-align: center;
            margin-bottom: 50px;
            position: relative;
            color: var(--heading-color);
            font-weight: 600;
            font-size: 2.2rem;
        }
        #yk-portal-v2 .yk-legacy-tool .section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 3px;
            background-color: var(--accent-color);
            margin: 10px auto 0;
            border-radius: 2px;
        }

        #yk-portal-v2 .yk-legacy-tool .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
            display: inline-block;
            background: rgba(59, 130, 246, 0.1);
            padding: 15px;
            border-radius: 50%;
            transition: transform 0.3s ease;
        }
        #yk-portal-v2 .yk-legacy-tool .feature-box:hover .feature-icon {
            transform: scale(1.1);
        }

        #yk-portal-v2 .yk-legacy-tool .feature-box h5 {
            color: var(--secondary-color);
            font-weight: 600;
            margin-bottom: 10px;
        }
        #yk-portal-v2 .yk-legacy-tool .feature-box p {
            color: var(--text-color-light);
            font-size: 0.95rem;
        }

        #yk-portal-v2 .yk-legacy-tool .software-screenshot img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            transition: transform 0.3s ease;
            border: 1px solid #ddd;
        }
        #yk-portal-v2 .yk-legacy-tool .software-screenshot img:hover {
            transform: scale(1.03);
        }

        #yk-portal-v2 .yk-legacy-tool .usage-guide ol {
            padding-left: 20px;
            list-style: none;
            counter-reset: step-counter;
        }
        #yk-portal-v2 .yk-legacy-tool .usage-guide li {
            margin-bottom: 20px;
            position: relative;
            padding-left: 45px;
            font-size: 1.05rem;
            color: var(--text-color-dark);
        }
        #yk-portal-v2 .yk-legacy-tool .usage-guide li::before {
            content: counter(step-counter);
            counter-increment: step-counter;
            position: absolute;
            left: 0;
            top: 0;
            width: 30px;
            height: 30px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            font-weight: bold;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.9rem;
        }
        #yk-portal-v2 .yk-legacy-tool .usage-guide li strong {
            color: var(--secondary-color);
            font-weight: 600;
        }
        #yk-portal-v2 .yk-legacy-tool .usage-guide code {
            background-color: #e9ecef;
            padding: 2px 5px;
            border-radius: 3px;
            font-size: 90%;
            color: #c7254e; /* Bootstrap code color */
        }
        #yk-portal-v2 .yk-legacy-tool .usage-guide .alert {
             margin-top: 20px;
             background-color: rgba(255, 193, 7, 0.1); /* Light yellow background */
             border-color: rgba(255, 193, 7, 0.3);
             color: #856404; /* Darker yellow text */
        }
         #yk-portal-v2 .yk-legacy-tool .usage-guide .alert i {
             margin-right: 8px;
         }

        #yk-portal-v2 .yk-legacy-tool .download-section .btn-download {
            background-color: var(--accent-color);
            border-color: var(--accent-color);
            color: white;
            padding: 12px 30px;
            font-size: 1.1rem;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
        }
        #yk-portal-v2 .yk-legacy-tool .download-section .btn-download:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(30, 64, 175, 0.5);
        }
        #yk-portal-v2 .yk-legacy-tool .download-section p {
            margin-top: 15px;
            color: var(--text-color-light);
        }