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

        /* Main color theme from logo, assuming blue tones */
        #yk-portal-v2 .yk-legacy-tool {
            --primary-color: #2563EB; /* Primary blue - adjust based on actual logo color */
            --secondary-color: #1E40AF; /* Dark blue - adjust based on actual logo color */
            --accent-color: #3B82F6; /* Light blue - adjust based on actual logo color */
            --nav-bg-color: rgba(13, 25, 49, 0.85); /* Dark blue background - adjust based on actual logo color */
        }

        #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);
        }

        /* Updated active state logic: Compare href with current page */
        /* .nav-item.active .nav-link { ... } */
        #yk-portal-v2 .yk-legacy-tool .nav-item .nav-link:hover {
           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; }
        }
    

        #yk-portal-v2 .yk-legacy-tool {
            font-family: 'Nunito', 'Poppins', 'Microsoft YaHei', sans-serif;
            background-color: #f8f9fa; /* Light background for content */
            color: #343a40;
        }
        #yk-portal-v2 .yk-legacy-tool .page-header {
            background: linear-gradient(rgba(13, 25, 49, 0.7), rgba(13, 25, 49, 0.7)), none center center no-repeat; /* Example background */
            background-size: cover;
            padding: 100px 0 60px 0;
            color: #fff;
            text-align: center;
            margin-top: 65px; /* Adjust based on navbar height */
        }
        #yk-portal-v2 .yk-legacy-tool .page-header h1 {
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 15px;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
        }
        #yk-portal-v2 .yk-legacy-tool .page-header p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 20px auto;
            color: rgba(255, 255, 255, 0.9);
        }
        #yk-portal-v2 .yk-legacy-tool .section {
            padding: 60px 0;
        }
        #yk-portal-v2 .yk-legacy-tool .section-title {
            text-align: center;
            margin-bottom: 50px;
            font-size: 2rem;
            font-weight: 600;
            color: var(--secondary-color);
            position: relative;
            padding-bottom: 15px;
        }
        #yk-portal-v2 .yk-legacy-tool .section-title::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 .feature-item,#yk-portal-v2 .yk-legacy-tool  .use-case-item,#yk-portal-v2 .yk-legacy-tool  .step-item {
            text-align: center;
            margin-bottom: 30px;
            padding: 20px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            background-color: #fff;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.05);
        }
        #yk-portal-v2 .yk-legacy-tool .feature-item:hover,#yk-portal-v2 .yk-legacy-tool  .use-case-item:hover,#yk-portal-v2 .yk-legacy-tool  .step-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.1);
        }
        #yk-portal-v2 .yk-legacy-tool .feature-item i,#yk-portal-v2 .yk-legacy-tool  .use-case-item i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
            display: block;
        }
        #yk-portal-v2 .yk-legacy-tool .feature-item h5,#yk-portal-v2 .yk-legacy-tool  .use-case-item h5 {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--secondary-color);
        }
        #yk-portal-v2 .yk-legacy-tool .feature-item p,#yk-portal-v2 .yk-legacy-tool  .use-case-item p {
            font-size: 0.95rem;
            color: #6c757d;
        }
        #yk-portal-v2 .yk-legacy-tool .screenshot-img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            margin-top: 20px;
            border: 1px solid #eee;
        }
        #yk-portal-v2 .yk-legacy-tool .usage-guide ol {
            list-style: none;
            padding-left: 0;
            counter-reset: step-counter;
        }
        #yk-portal-v2 .yk-legacy-tool .usage-guide li {
            counter-increment: step-counter;
            margin-bottom: 25px;
            padding-left: 50px;
            position: relative;
            font-size: 1.1rem;
            line-height: 1.6;
        }
        #yk-portal-v2 .yk-legacy-tool .usage-guide li::before {
            content: counter(step-counter);
            position: absolute;
            left: 0;
            top: 0;
            width: 35px;
            height: 35px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            font-weight: bold;
            text-align: center;
            line-height: 35px;
            font-size: 1rem;
        }
         #yk-portal-v2 .yk-legacy-tool .usage-guide li strong {
            font-weight: 600;
            color: var(--secondary-color);
            display: block;
            margin-bottom: 5px;
        }
        #yk-portal-v2 .yk-legacy-tool .download-section {
            background-color: var(--secondary-color);
            color: #fff;
            text-align: center;
        }
        #yk-portal-v2 .yk-legacy-tool .download-section .section-title {
            color: #fff;
        }
        #yk-portal-v2 .yk-legacy-tool .download-section .section-title::after {
            background: #fff;
        }
        #yk-portal-v2 .yk-legacy-tool .download-btn {
            background-color: var(--accent-color);
            color: white;
            padding: 15px 30px;
            font-size: 1.1rem;
            font-weight: 600;
            border: none;
            border-radius: 50px;
            transition: background-color 0.3s ease, transform 0.3s ease;
            text-decoration: none;
            display: inline-block;
            margin-top: 20px;
        }
        #yk-portal-v2 .yk-legacy-tool .download-btn:hover {
            background-color: #2563EB; /* Darker accent */
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        #yk-portal-v2 .yk-legacy-tool .download-note {
            margin-top: 15px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.8);
        }