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

        #yk-portal-v2 .yk-legacy-tool {
            /* font-family removed as it should be in main CSS or page */
             padding-top: 60px; /* Adjust based on actual navbar height */
        }
        
        /* 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 */
        }
        
        #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);
        }
        
        #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: 70px; /* Adjust for smaller screens */
            }
            #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 {
                padding-top: 66px; /* Adjust for smallest screens */
            }
            #yk-portal-v2 .yk-legacy-tool .navbar-brand img {
                height: 32px;
            }
            
            #yk-portal-v2 .yk-legacy-tool .brand-text {
                font-size: 1.2rem;
            }
        }

        #yk-portal-v2 .yk-legacy-tool .page-header {
            background: linear-gradient(rgba(13, 25, 49, 0.9), rgba(13, 25, 49, 0.9)), none center center no-repeat;
            background-size: cover;
            padding: 80px 0;
            text-align: center;
            color: #fff;
        }

        #yk-portal-v2 .yk-legacy-tool .page-header h1 {
            font-size: 3rem;
            font-weight: 700;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
        }

        #yk-portal-v2 .yk-legacy-tool .page-header p {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 700px;
            margin: 15px auto 0;
        }

        #yk-portal-v2 .yk-legacy-tool .content-section {
            padding: 60px 0;
        }

        #yk-portal-v2 .yk-legacy-tool .content-section h2 {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 40px;
            text-align: center;
            color: var(--secondary-color);
            position: relative;
            padding-bottom: 15px;
        }
        
        #yk-portal-v2 .yk-legacy-tool .content-section h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

        #yk-portal-v2 .yk-legacy-tool .feature-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }

        #yk-portal-v2 .yk-legacy-tool .guide-step {
            display: flex;
            align-items: flex-start;
            margin-bottom: 20px;
        }

        #yk-portal-v2 .yk-legacy-tool .guide-step-number {
            min-width: 35px;
            height: 35px;
            background-color: var(--primary-color);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            margin-right: 15px;
            flex-shrink: 0;
        }

        #yk-portal-v2 .yk-legacy-tool .guide-step p {
            margin-bottom: 0;
            line-height: 1.8;
        }
        
        #yk-portal-v2 .yk-legacy-tool .software-image-container {
             text-align: center;
             margin-bottom: 40px;
             padding: 20px;
             background-color: #f8f9fa;
             border-radius: 15px;
             box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }

        #yk-portal-v2 .yk-legacy-tool .software-image-container img {
             max-width: 100%;
             height: auto;
             border-radius: 10px;
             box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        #yk-portal-v2 .yk-legacy-tool .download-section {
             background-color: var(--secondary-color);
             color: #fff;
             padding: 60px 0;
             text-align: center;
        }
        
        #yk-portal-v2 .yk-legacy-tool .download-section h2 {
            color: #fff;
            margin-bottom: 30px;
        }
        
        #yk-portal-v2 .yk-legacy-tool .download-section h2::after {
             background-color: #fff;
        }

        #yk-portal-v2 .yk-legacy-tool .download-section p {
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 30px;
        }
        
        #yk-portal-v2 .yk-legacy-tool .download-button {
            font-size: 1.1rem;
            padding: 12px 30px;
            background-color: var(--accent-color);
            border: none;
            transition: all 0.3s ease;
        }
        
        #yk-portal-v2 .yk-legacy-tool .download-button:hover {
            background-color: #3B82F6; /* Lighter accent */
            transform: translateY(-3px);
            box-shadow: 0 8px 15px rgba(59, 130, 246, 0.3);
        }