/* 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 */
        }

        /* 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);
        }

        /* Adjust active link color for this specific page */
        #yk-portal-v2 .yk-legacy-tool .nav-item.program-tool-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.program-tool-active .nav-link:before {
             transform: translateX(-50%) scale(1);
         }


        #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 .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;
            }
        }

        /* Software Intro Page Specific Styles */
        #yk-portal-v2 .yk-legacy-tool .page-header {
            padding: 120px 0 60px; /* Increased top padding */
            background: linear-gradient(135deg, rgba(13, 25, 49, 0.95) 0%, rgba(20, 40, 70, 0.9) 100%), none no-repeat center center/cover;
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        #yk-portal-v2 .yk-legacy-tool .page-header h1 {
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 15px;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.4);
            animation: fadeInDown 1s ease-out;
        }

        #yk-portal-v2 .yk-legacy-tool .page-header p {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 700px;
            margin: 0 auto 30px;
            animation: fadeInUp 1s ease-out 0.3s;
            animation-fill-mode: backwards; /* Start animation slightly delayed */
        }

        #yk-portal-v2 .yk-legacy-tool .section {
            padding: 80px 0;
        }

        #yk-portal-v2 .yk-legacy-tool .section-bg {
            background-color: #f8f9fa;
        }

        #yk-portal-v2 .yk-legacy-tool .section-title {
            text-align: center;
            margin-bottom: 50px;
            position: relative;
        }

        #yk-portal-v2 .yk-legacy-tool .section-title h2 {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 15px;
            color: #333;
            position: relative;
            display: inline-block;
            padding-bottom: 10px;
        }

        #yk-portal-v2 .yk-legacy-tool .section-title h2::after {
            content: '';
            position: absolute;
            display: block;
            width: 60px;
            height: 3px;
            background: var(--primary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }

        #yk-portal-v2 .yk-legacy-tool .section-title p {
            color: #666;
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto;
        }

        #yk-portal-v2 .yk-legacy-tool .feature-box,#yk-portal-v2 .yk-legacy-tool  .usage-step,#yk-portal-v2 .yk-legacy-tool  .download-section {
            background: #fff;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 5px 25px rgba(0, 0, 0, 0.08);
            margin-bottom: 30px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

         #yk-portal-v2 .yk-legacy-tool .feature-box:hover,#yk-portal-v2 .yk-legacy-tool  .usage-step:hover,#yk-portal-v2 .yk-legacy-tool  .download-section:hover {
             transform: translateY(-8px);
             box-shadow: 0 12px 35px rgba(0, 0, 0, 0.12);
         }

        #yk-portal-v2 .yk-legacy-tool .feature-icon i {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
            display: block; /* Center icon */
            text-align: center;
        }

        #yk-portal-v2 .yk-legacy-tool .feature-box h3,#yk-portal-v2 .yk-legacy-tool  .usage-step h4 {
            font-size: 1.5rem;
            font-weight: 600;
            color: #333;
            margin-bottom: 15px;
            text-align: center; /* Center heading */
        }
         #yk-portal-v2 .yk-legacy-tool .usage-step h4 {
             text-align: left;
         }


        #yk-portal-v2 .yk-legacy-tool .feature-box p,#yk-portal-v2 .yk-legacy-tool  .usage-step p {
            color: #555;
            line-height: 1.7;
             text-align: center; /* Center paragraph */
        }
        #yk-portal-v2 .yk-legacy-tool .usage-step p {
             text-align: left;
         }

        #yk-portal-v2 .yk-legacy-tool .software-image img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            display: block; /* Ensure image is block level */
            margin: 40px auto 0; /* Center image with top margin */
            transition: transform 0.3s ease;
        }
        #yk-portal-v2 .yk-legacy-tool .software-image img:hover {
            transform: scale(1.03);
        }

        #yk-portal-v2 .yk-legacy-tool .usage-list {
            list-style: none;
            padding-left: 0;
        }

        #yk-portal-v2 .yk-legacy-tool .usage-list li {
            margin-bottom: 20px;
            padding-left: 35px;
            position: relative;
        }

        #yk-portal-v2 .yk-legacy-tool .usage-list li::before {
            content: '\f00c'; /* Font Awesome check icon */
            font-family: 'Font Awesome 5 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            top: 4px;
            color: var(--primary-color);
            font-size: 1.2rem;
        }

        #yk-portal-v2 .yk-legacy-tool .download-button {
            display: inline-block;
            background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
            color: #fff;
            padding: 15px 35px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
            border: none;
            cursor: pointer;
            margin-top: 20px;
        }

        #yk-portal-v2 .yk-legacy-tool .download-button:hover {
            background: linear-gradient(45deg, var(--accent-color), var(--primary-color));
            color: #fff;
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(59, 130, 246, 0.6);
        }

        #yk-portal-v2 .yk-legacy-tool .download-button i {
            margin-right: 10px;
        }

        #yk-portal-v2 .yk-legacy-tool .download-section {
             text-align: center;
         }


         /* Responsive Adjustments */
        @media (max-width: 767px) {
            #yk-portal-v2 .yk-legacy-tool .page-header h1 {
                font-size: 2.5rem;
            }
            #yk-portal-v2 .yk-legacy-tool .page-header p {
                font-size: 1rem;
            }
            #yk-portal-v2 .yk-legacy-tool .section-title h2 {
                font-size: 2rem;
            }
             #yk-portal-v2 .yk-legacy-tool .feature-box h3,#yk-portal-v2 .yk-legacy-tool  .usage-step h4 {
                 font-size: 1.3rem;
             }
             #yk-portal-v2 .yk-legacy-tool .feature-box p,#yk-portal-v2 .yk-legacy-tool  .usage-step p {
                 font-size: 0.95rem;
             }
        }