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

        #yk-portal-v2 .yk-legacy-tool {
            --ink: #102a43;
            --body: #486581;
            --muted: #718096;
            --line: #d9e2ec;
            --paper: #ffffff;
            --mist: #f5f9fc;
            --blue: #0b72b9;
            --blue-dark: #075985;
            --cyan: #0891b2;
            --teal: #0f766e;
            --amber: #d97706;
            --shadow: 0 12px 35px rgba(16, 42, 67, .10);
        }
        #yk-portal-v2 .yk-legacy-tool * { box-sizing: border-box; }
        #yk-portal-v2 .yk-legacy-tool { scroll-behavior: smooth; }
        #yk-portal-v2 .yk-legacy-tool {
            padding-top: 60px;
            color: var(--body);
            background: var(--paper);
            font-family: 'Nunito', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.75;
        }
        /* Keep the shared site navigation aligned with the other product pages. */
        #yk-portal-v2 .yk-legacy-tool .navbar {
            background-color: rgba(13, 25, 49, .9);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            padding: 10px 0;
            transition: all .4s ease;
            box-shadow: 0 5px 20px rgba(0, 0, 0, .1);
        }
        #yk-portal-v2 .yk-legacy-tool .navbar-scrolled { padding: 8px 0; background-color: rgba(13, 25, 49, .96); box-shadow: 0 5px 20px rgba(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 { width: auto; height: 40px; margin-right: 10px; transition: all .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, .95); font-size: 1.5rem; font-weight: 700; line-height: 1; text-shadow: 0 2px 10px rgba(0, 0, 0, .2); transition: all .3s ease; }
        #yk-portal-v2 .yk-legacy-tool .navbar-scrolled .brand-text { font-size: 1.3rem; }
        #yk-portal-v2 .yk-legacy-tool .navbar .nav-item { position: relative; margin: 0 5px; }
        #yk-portal-v2 .yk-legacy-tool .navbar .nav-link {
            position: relative;
            margin: 0 15px;
            padding: 10px 0 !important;
            color: rgba(255, 255, 255, .9) !important;
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 1px;
            line-height: 1.5;
            transition: all .3s ease;
        }
        #yk-portal-v2 .yk-legacy-tool .navbar .nav-link::before {
            content: '';
            position: absolute;
            right: 50%;
            bottom: 0;
            width: 5px;
            height: 5px;
            border-radius: 50%;
            background-color: #38bdf8;
            transform: translateX(50%) scale(0);
            transition: transform .3s ease;
        }
        #yk-portal-v2 .yk-legacy-tool .navbar .nav-link:hover::before,#yk-portal-v2 .yk-legacy-tool 
        .navbar .nav-item.active .nav-link::before { transform: translateX(50%) scale(1); }
        #yk-portal-v2 .yk-legacy-tool .navbar .nav-item.active .nav-link { color: #38bdf8 !important; }
        #yk-portal-v2 .yk-legacy-tool .navbar .nav-item:hover .nav-link { color: #fff !important; transform: translateY(-2px); }
        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler { padding: 0; border: 0; outline: 0; }
        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler:focus { box-shadow: none; }
        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler-icon { position: relative; width: 24px; height: 17px; background-image: none; }
        #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 {
            content: '';
            position: absolute;
            left: 0;
            width: 100%;
            height: 2px;
            border-radius: 3px;
            background-color: #fff;
            transition: all .3s ease;
        }
        #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 { margin-top: 15px; padding: 16px 20px; background-color: rgba(13, 25, 49, .98); border-radius: 10px; box-shadow: 0 10px 30px rgba(0, 0, 0, .15); }
            #yk-portal-v2 .yk-legacy-tool .navbar-nav .nav-item { margin: 4px 0; }
            #yk-portal-v2 .yk-legacy-tool .navbar .nav-link { margin: 0; padding: 8px 0 !important; }
            #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 .hero {
            height: auto !important;
            min-height: auto !important;
            padding: 5.2rem 0 4.5rem;
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
            background: linear-gradient(135deg, #073b63 0%, #075985 50%, #0b7894 100%);
        }
        #yk-portal-v2 .yk-legacy-tool .hero::before { content: ''; position: absolute; inset: 0; background: linear-gradient(120deg, rgba(255,255,255,.08), transparent 48%, rgba(255,255,255,.05)); pointer-events: none; }
        #yk-portal-v2 .yk-legacy-tool .hero .container { position: relative; z-index: 1; }
        #yk-portal-v2 .yk-legacy-tool .hero h1 { margin: 0 auto 1rem; max-width: 900px; font-size: clamp(2rem, 4vw, 3.1rem); font-weight: 800; letter-spacing: .02em; line-height: 1.25; }
        #yk-portal-v2 .yk-legacy-tool .hero .subtitle { max-width: 760px; margin: 0 auto; font-size: 1.12rem; line-height: 1.9; color: rgba(255,255,255,.92); }
        #yk-portal-v2 .yk-legacy-tool .badge-row { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-top: 1.7rem; }
        #yk-portal-v2 .yk-legacy-tool .badge-item { display: inline-flex; align-items: center; gap: 7px; padding: 7px 16px; color: #effcff; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.2); border-radius: 999px; font-size: .88rem; font-weight: 700; }
        #yk-portal-v2 .yk-legacy-tool .section { padding: 4.8rem 0; }
        #yk-portal-v2 .yk-legacy-tool .section-alt { background: var(--mist); }
        #yk-portal-v2 .yk-legacy-tool .section-title { max-width: 760px; margin: 0 auto 2.8rem; text-align: center; }
        #yk-portal-v2 .yk-legacy-tool .section-title h2 { color: var(--ink); font-size: clamp(1.65rem, 3vw, 2.2rem); font-weight: 800; margin-bottom: .55rem; }
        #yk-portal-v2 .yk-legacy-tool .section-title p { color: var(--muted); margin: .75rem auto 0; }
        #yk-portal-v2 .yk-legacy-tool .underline { width: 54px; height: 4px; margin: 0 auto; background: linear-gradient(90deg, var(--blue), var(--cyan)); border-radius: 2px; }
        #yk-portal-v2 .yk-legacy-tool .pain-card,#yk-portal-v2 .yk-legacy-tool  .feature-card,#yk-portal-v2 .yk-legacy-tool  .scenario-card { height: 100%; background: #fff; border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 5px 18px rgba(16,42,67,.05); transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
        #yk-portal-v2 .yk-legacy-tool .pain-card:hover,#yk-portal-v2 .yk-legacy-tool  .feature-card:hover,#yk-portal-v2 .yk-legacy-tool  .scenario-card:hover { transform: translateY(-5px); border-color: rgba(11,114,185,.35); box-shadow: var(--shadow); }
        #yk-portal-v2 .yk-legacy-tool .pain-card { padding: 1.8rem; }
        #yk-portal-v2 .yk-legacy-tool .pain-icon,#yk-portal-v2 .yk-legacy-tool  .icon-wrap,#yk-portal-v2 .yk-legacy-tool  .sc-icon { display: inline-flex; align-items: center; justify-content: center; width: 52px; height: 52px; margin-bottom: 1.1rem; border-radius: 13px; color: #fff; font-size: 1.25rem; }
        #yk-portal-v2 .yk-legacy-tool .pain-icon.red { background: #dc5a5a; } #yk-portal-v2 .yk-legacy-tool .pain-icon.amber { background: var(--amber); } #yk-portal-v2 .yk-legacy-tool .pain-icon.blue { background: var(--blue); }
        #yk-portal-v2 .yk-legacy-tool .pain-card h5,#yk-portal-v2 .yk-legacy-tool  .feature-card h5,#yk-portal-v2 .yk-legacy-tool  .scenario-card h5 { color: var(--ink); font-size: 1.12rem; font-weight: 800; margin-bottom: .55rem; }
        #yk-portal-v2 .yk-legacy-tool .pain-card p,#yk-portal-v2 .yk-legacy-tool  .feature-card p,#yk-portal-v2 .yk-legacy-tool  .scenario-card p { margin-bottom: 0; font-size: .96rem; }
        #yk-portal-v2 .yk-legacy-tool .feature-card { padding: 1.65rem 1.55rem; }
        #yk-portal-v2 .yk-legacy-tool .icon-wrap { background: var(--blue); } #yk-portal-v2 .yk-legacy-tool .grad-2 { background: var(--teal); } #yk-portal-v2 .yk-legacy-tool .grad-3 { background: #c76b19; } #yk-portal-v2 .yk-legacy-tool .grad-4 { background: #1d7894; } #yk-portal-v2 .yk-legacy-tool .grad-5 { background: #26734d; } #yk-portal-v2 .yk-legacy-tool .grad-6 { background: #4766a8; }
        #yk-portal-v2 .yk-legacy-tool .feature-card h5 { margin-top: .15rem; }
        #yk-portal-v2 .yk-legacy-tool .scenario-card { padding: 1.5rem; text-align: center; }
        #yk-portal-v2 .yk-legacy-tool .sc-icon { margin-bottom: .9rem; background: var(--blue); } #yk-portal-v2 .yk-legacy-tool .sc-icon.grad-2 { background: var(--teal); } #yk-portal-v2 .yk-legacy-tool .sc-icon.grad-3 { background: #c76b19; } #yk-portal-v2 .yk-legacy-tool .sc-icon.grad-4 { background: #4766a8; }
        #yk-portal-v2 .yk-legacy-tool .screenshot-wrapper { padding: 10px; background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); }
        #yk-portal-v2 .yk-legacy-tool .screenshot-wrapper img { display: block; width: 100%; height: auto; border-radius: 7px; }
        #yk-portal-v2 .yk-legacy-tool .screenshot-caption { margin: .85rem 0 .15rem; color: var(--muted); text-align: center; font-size: .9rem; }
        #yk-portal-v2 .yk-legacy-tool .step-list { max-width: 850px; margin: 0 auto; }
        #yk-portal-v2 .yk-legacy-tool .step-item { display: flex; gap: 1.15rem; align-items: flex-start; padding: 1.25rem 1.35rem; margin-bottom: 1rem; background: #fff; border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 4px 14px rgba(16,42,67,.04); }
        #yk-portal-v2 .yk-legacy-tool .step-num { flex: 0 0 38px; width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center; border-radius: 50%; color: #fff; background: var(--blue); font-size: 1rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .step-content h6 { margin: .1rem 0 .25rem; color: var(--ink); font-size: 1.04rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .step-content p { margin: 0; font-size: .95rem; }
        #yk-portal-v2 .yk-legacy-tool .format-strip { margin: 2.2rem auto 0; padding: 1rem 1.3rem; max-width: 850px; color: #245b70; background: #e8f6f8; border-left: 4px solid var(--cyan); border-radius: 0 8px 8px 0; }
        #yk-portal-v2 .yk-legacy-tool .faq-list { max-width: 850px; margin: 0 auto; }
        #yk-portal-v2 .yk-legacy-tool .faq-item { margin-bottom: .8rem; overflow: hidden; background: #fff; border: 1px solid var(--line); border-radius: 9px; }
        #yk-portal-v2 .yk-legacy-tool .faq-question { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.05rem 1.25rem; color: var(--ink); font-weight: 800; cursor: pointer; }
        #yk-portal-v2 .yk-legacy-tool .faq-question i { color: var(--blue); transition: transform .2s ease; }
        #yk-portal-v2 .yk-legacy-tool .faq-question.active i { transform: rotate(180deg); }
        #yk-portal-v2 .yk-legacy-tool .faq-answer { display: none; padding: 0 1.25rem 1.1rem; color: var(--body); font-size: .96rem; }
        #yk-portal-v2 .yk-legacy-tool .faq-answer.open { display: block; }
        #yk-portal-v2 .yk-legacy-tool .download-section { padding: 5rem 0; color: #fff; text-align: center; background: linear-gradient(135deg, #075985, #0f766e); }
        #yk-portal-v2 .yk-legacy-tool .download-section h2 { margin-bottom: .6rem; font-size: clamp(1.65rem, 3vw, 2.25rem); font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .download-section p { margin-bottom: 1.65rem; color: rgba(255,255,255,.88); }
        #yk-portal-v2 .yk-legacy-tool .btn-download { display: inline-flex; align-items: center; gap: .55rem; padding: 13px 28px; color: #075985; background: #fff; border: 2px solid #fff; border-radius: 7px; font-weight: 800; text-decoration: none; transition: transform .2s ease, background .2s ease; }
        #yk-portal-v2 .yk-legacy-tool .btn-download:hover { color: #064e6e; background: #e6f7fa; transform: translateY(-2px); text-decoration: none; }
        #yk-portal-v2 .yk-legacy-tool .btn-download.secondary { margin-top: 1rem; color: #fff; background: transparent; border-color: rgba(255,255,255,.55); font-size: .95rem; }
        #yk-portal-v2 .yk-legacy-tool .btn-download.secondary:hover { color: #fff; background: rgba(255,255,255,.12); }
        #yk-portal-v2 .yk-legacy-tool .download-note { margin-top: 1.15rem; color: rgba(255,255,255,.82); font-size: .9rem; }
        @media (max-width: 767px) {
            #yk-portal-v2 .yk-legacy-tool { padding-top: 56px; }
            #yk-portal-v2 .yk-legacy-tool .hero { padding: 3.7rem 0 3.4rem; }
            #yk-portal-v2 .yk-legacy-tool .hero .subtitle { padding: 0 .6rem; font-size: 1rem; }
            #yk-portal-v2 .yk-legacy-tool .section { padding: 3.5rem 0; }
            #yk-portal-v2 .yk-legacy-tool .step-item { padding: 1.05rem; }
        }
        @media (max-width: 480px) {
            #yk-portal-v2 .yk-legacy-tool .badge-item { padding: 6px 11px; font-size: .8rem; }
            #yk-portal-v2 .yk-legacy-tool .faq-question { padding: .95rem 1rem; }
            #yk-portal-v2 .yk-legacy-tool .faq-answer { padding: 0 1rem 1rem; }
        }