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

        #yk-portal-v2 .yk-legacy-tool {
            --ink: #102a43;
            --ink-soft: #486581;
            --muted: #6b7c93;
            --line: #d9e2ec;
            --paper: #ffffff;
            --wash: #f5f8fb;
            --wash-blue: #eaf4f8;
            --navy: #102a43;
            --teal: #0f766e;
            --teal-bright: #0d9488;
            --orange: #c65d21;
            --yellow: #d97706;
            --shadow: 0 14px 38px rgba(16, 42, 67, .10);
            --shadow-small: 0 4px 16px rgba(16, 42, 67, .08);
            --radius: 12px;
        }

        #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;
            margin: 0;
            color: var(--ink-soft);
            background: var(--paper);
            font-family: 'Nunito', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.75;
        }
        /* Shared navigation styling from the product-page layout. */
        #yk-portal-v2 .yk-legacy-tool .navbar {
            z-index: 20;
            padding: 10px 0;
            background-color: rgba(13, 25, 49, .9);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            box-shadow: 0 5px 20px rgba(0,0,0,.1);
            transition: all .3s ease;
        }
        #yk-portal-v2 .yk-legacy-tool .navbar-scrolled { padding: 8px 0; background-color: rgba(13,25,49,.97); 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; max-width: 40px; margin-right: 10px; object-fit: contain; transition: all .3s ease; }
        #yk-portal-v2 .yk-legacy-tool .navbar-scrolled .navbar-brand img { height: 36px; max-width: 36px; }
        #yk-portal-v2 .yk-legacy-tool .brand-text { color: rgba(255,255,255,.95); font-size: 1.5rem; font-weight: 700; 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 .nav-item { position: relative; margin: 0 5px; }
        #yk-portal-v2 .yk-legacy-tool .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; text-transform: uppercase; transition: all .3s ease; }
        #yk-portal-v2 .yk-legacy-tool .nav-link::before { content: ''; position: absolute; bottom: 0; left: 50%; width: 5px; height: 5px; border-radius: 50%; background: var(--teal-bright); transform: translateX(-50%) scale(0); transition: transform .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: #5eead4 !important; }
        #yk-portal-v2 .yk-legacy-tool .nav-item:hover .nav-link { color: #fff !important; transform: translateY(-2px); }
        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-toggler { border: 0; outline: 0; padding: 0; }
        #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 { position: absolute; left: 0; width: 100%; height: 2px; border-radius: 3px; background: #fff; content: ''; 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: 20px; border-radius: 10px; background: rgba(13,25,49,.98); box-shadow: 0 10px 30px rgba(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; max-width: 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; max-width: 32px; }
            #yk-portal-v2 .yk-legacy-tool .brand-text { font-size: 1.2rem; }
        }

        /* The shared stylesheet uses a full-screen hero for the home page. */
        #yk-portal-v2 .yk-legacy-tool .hero {
            height: auto !important;
            min-height: auto !important;
            padding: 74px 0 66px;
            color: #fff;
            text-align: left;
            background: #123b56;
            position: relative;
            overflow: hidden;
        }
        #yk-portal-v2 .yk-legacy-tool .hero::after {
            content: '';
            position: absolute;
            inset: 0;
            pointer-events: none;
            opacity: .22;
            background-image: linear-gradient(rgba(255,255,255,.12) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.12) 1px, transparent 1px);
            background-size: 42px 42px;
            mask-image: linear-gradient(90deg, black, transparent 85%);
        }
        #yk-portal-v2 .yk-legacy-tool .hero .container { position: relative; z-index: 1; }
        #yk-portal-v2 .yk-legacy-tool .hero-copy { max-width: 760px; }
        #yk-portal-v2 .yk-legacy-tool .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 12px;
            border: 1px solid rgba(255,255,255,.28);
            border-radius: 5px;
            color: #d7f6f0;
            background: rgba(15,118,110,.28);
            font-size: .82rem;
            font-weight: 700;
            letter-spacing: .06em;
        }
        #yk-portal-v2 .yk-legacy-tool .hero h1 {
            margin: 18px 0 14px;
            color: #fff;
            font-size: clamp(2rem, 4vw, 3.15rem);
            font-weight: 800;
            letter-spacing: 0;
            line-height: 1.25;
        }
        #yk-portal-v2 .yk-legacy-tool .hero .subtitle {
            max-width: 720px;
            margin: 0;
            color: #e5eef5;
            font-size: 1.08rem;
            line-height: 1.9;
        }
        #yk-portal-v2 .yk-legacy-tool .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
        #yk-portal-v2 .yk-legacy-tool .hero-actions a { text-decoration: none; }
        #yk-portal-v2 .yk-legacy-tool .btn-primary-soft,#yk-portal-v2 .yk-legacy-tool  .btn-outline-soft {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 46px;
            padding: 10px 20px;
            border-radius: 6px;
            font-weight: 800;
            transition: transform .2s, box-shadow .2s, background .2s;
        }
        #yk-portal-v2 .yk-legacy-tool .btn-primary-soft { color: var(--navy); background: #f7c948; box-shadow: 0 8px 18px rgba(0,0,0,.16); }
        #yk-portal-v2 .yk-legacy-tool .btn-primary-soft:hover { color: var(--navy); background: #ffd86a; transform: translateY(-2px); }
        #yk-portal-v2 .yk-legacy-tool .btn-outline-soft { color: #fff; border: 1px solid rgba(255,255,255,.48); background: rgba(255,255,255,.08); }
        #yk-portal-v2 .yk-legacy-tool .btn-outline-soft:hover { color: #fff; background: rgba(255,255,255,.16); transform: translateY(-2px); }
        #yk-portal-v2 .yk-legacy-tool .hero-points { display: flex; flex-wrap: wrap; gap: 16px 24px; margin: 28px 0 0; padding: 0; list-style: none; color: #d5e5ef; font-size: .9rem; }
        #yk-portal-v2 .yk-legacy-tool .hero-points i { margin-right: 6px; color: #7ee2d3; }

        #yk-portal-v2 .yk-legacy-tool .section { padding: 74px 0; }
        #yk-portal-v2 .yk-legacy-tool .section-alt { background: var(--wash); }
        #yk-portal-v2 .yk-legacy-tool .section-head { max-width: 680px; margin: 0 auto 42px; text-align: center; }
        #yk-portal-v2 .yk-legacy-tool .section-kicker { margin-bottom: 8px; color: var(--teal); font-size: .82rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
        #yk-portal-v2 .yk-legacy-tool .section-head h2 { margin: 0 0 10px; color: var(--ink); font-size: clamp(1.65rem, 3vw, 2.15rem); font-weight: 800; line-height: 1.35; }
        #yk-portal-v2 .yk-legacy-tool .section-head p { margin: 0; color: var(--muted); font-size: 1rem; }

        #yk-portal-v2 .yk-legacy-tool .pain-grid,#yk-portal-v2 .yk-legacy-tool  .feature-grid,#yk-portal-v2 .yk-legacy-tool  .scenario-grid { display: grid; gap: 18px; }
        #yk-portal-v2 .yk-legacy-tool .pain-grid { grid-template-columns: repeat(3, 1fr); }
        #yk-portal-v2 .yk-legacy-tool .feature-grid { grid-template-columns: repeat(3, 1fr); }
        #yk-portal-v2 .yk-legacy-tool .scenario-grid { grid-template-columns: repeat(4, 1fr); }
        #yk-portal-v2 .yk-legacy-tool .info-card,#yk-portal-v2 .yk-legacy-tool  .feature-card,#yk-portal-v2 .yk-legacy-tool  .scenario-card {
            height: 100%;
            padding: 25px 23px;
            border: 1px solid var(--line);
            border-radius: var(--radius);
            background: var(--paper);
            box-shadow: var(--shadow-small);
            transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
        }
        #yk-portal-v2 .yk-legacy-tool .info-card:hover,#yk-portal-v2 .yk-legacy-tool  .feature-card:hover,#yk-portal-v2 .yk-legacy-tool  .scenario-card:hover { transform: translateY(-4px); border-color: #a9c7d6; box-shadow: var(--shadow); }
        #yk-portal-v2 .yk-legacy-tool .icon-box { display: inline-flex; align-items: center; justify-content: center; width: 48px; height: 48px; margin-bottom: 17px; border-radius: 10px; color: #fff; font-size: 1.2rem; }
        #yk-portal-v2 .yk-legacy-tool .icon-teal { background: var(--teal); }
        #yk-portal-v2 .yk-legacy-tool .icon-orange { background: var(--orange); }
        #yk-portal-v2 .yk-legacy-tool .icon-yellow { background: var(--yellow); }
        #yk-portal-v2 .yk-legacy-tool .icon-navy { background: var(--navy); }
        #yk-portal-v2 .yk-legacy-tool .info-card h3,#yk-portal-v2 .yk-legacy-tool  .feature-card h3,#yk-portal-v2 .yk-legacy-tool  .scenario-card h3 { margin: 0 0 8px; color: var(--ink); font-size: 1.08rem; font-weight: 800; line-height: 1.45; }
        #yk-portal-v2 .yk-legacy-tool .info-card p,#yk-portal-v2 .yk-legacy-tool  .feature-card p,#yk-portal-v2 .yk-legacy-tool  .scenario-card p { margin: 0; color: var(--muted); font-size: .94rem; line-height: 1.75; }
        #yk-portal-v2 .yk-legacy-tool .pain-intro { max-width: 800px; margin: -18px auto 32px; color: var(--ink-soft); text-align: center; font-size: 1.06rem; }

        #yk-portal-v2 .yk-legacy-tool .feature-card { padding: 24px 22px 26px; }
        #yk-portal-v2 .yk-legacy-tool .feature-card .benefit { display: block; margin-top: 13px; padding-top: 12px; border-top: 1px solid #edf1f5; color: var(--teal); font-size: .86rem; font-weight: 700; line-height: 1.6; }
        #yk-portal-v2 .yk-legacy-tool .feature-card .benefit i { margin-right: 5px; }
        #yk-portal-v2 .yk-legacy-tool .shot-wrap { margin-top: 38px; padding: 13px; border: 1px solid var(--line); border-radius: 14px; background: #e9f0f4; box-shadow: var(--shadow); }
        #yk-portal-v2 .yk-legacy-tool .shot-wrap img { display: block; width: 100%; height: auto; border: 1px solid #c4d2dc; border-radius: 8px; }
        #yk-portal-v2 .yk-legacy-tool .shot-caption { margin: 12px 0 1px; color: var(--muted); text-align: center; font-size: .88rem; }

        #yk-portal-v2 .yk-legacy-tool .scenario-card { padding: 23px 19px; text-align: center; }
        #yk-portal-v2 .yk-legacy-tool .scenario-card .icon-box { width: 54px; height: 54px; margin-bottom: 15px; border-radius: 50%; }
        #yk-portal-v2 .yk-legacy-tool .scenario-card h3 { font-size: 1rem; }

        #yk-portal-v2 .yk-legacy-tool .guide-layout { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr); gap: 34px; align-items: start; }
        #yk-portal-v2 .yk-legacy-tool .steps { display: grid; gap: 13px; counter-reset: step; }
        #yk-portal-v2 .yk-legacy-tool .step { display: grid; grid-template-columns: 42px 1fr; gap: 15px; align-items: start; padding: 18px 20px; border: 1px solid var(--line); border-radius: 10px; background: #fff; box-shadow: var(--shadow-small); }
        #yk-portal-v2 .yk-legacy-tool .step-number { display: flex; align-items: center; justify-content: center; width: 38px; height: 38px; border-radius: 50%; color: #fff; background: var(--teal); font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .step h3 { margin: 1px 0 4px; color: var(--ink); font-size: 1rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .step p { margin: 0; color: var(--muted); font-size: .92rem; line-height: 1.7; }
        #yk-portal-v2 .yk-legacy-tool .guide-aside { padding: 27px; border-left: 4px solid var(--teal); background: var(--wash-blue); }
        #yk-portal-v2 .yk-legacy-tool .guide-aside h3 { margin: 0 0 13px; color: var(--ink); font-size: 1.1rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .guide-aside ul { margin: 0; padding-left: 20px; color: var(--ink-soft); font-size: .92rem; }
        #yk-portal-v2 .yk-legacy-tool .guide-aside li + li { margin-top: 9px; }

        #yk-portal-v2 .yk-legacy-tool .faq-list { max-width: 860px; margin: 0 auto; }
        #yk-portal-v2 .yk-legacy-tool .faq-list details { margin-bottom: 12px; border: 1px solid var(--line); border-radius: 9px; background: #fff; box-shadow: var(--shadow-small); overflow: hidden; }
        #yk-portal-v2 .yk-legacy-tool .faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px 21px; color: var(--ink); cursor: pointer; list-style: none; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .faq-list summary::-webkit-details-marker { display: none; }
        #yk-portal-v2 .yk-legacy-tool .faq-list summary::after { content: '+'; flex: 0 0 auto; color: var(--teal); font-size: 1.35rem; font-weight: 400; line-height: 1; }
        #yk-portal-v2 .yk-legacy-tool .faq-list details[open] summary::after { content: '−'; }
        #yk-portal-v2 .yk-legacy-tool .faq-list details[open] summary { background: var(--wash-blue); }
        #yk-portal-v2 .yk-legacy-tool .faq-answer { padding: 0 21px 19px; color: var(--muted); font-size: .94rem; line-height: 1.8; }

        #yk-portal-v2 .yk-legacy-tool .download-section { padding: 74px 0; color: #fff; text-align: center; background: #0f766e; }
        #yk-portal-v2 .yk-legacy-tool .download-section h2 { margin: 0 0 10px; color: #fff; font-size: clamp(1.7rem, 3vw, 2.2rem); font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .download-section p { max-width: 680px; margin: 0 auto 24px; color: #e0f7f3; }
        #yk-portal-v2 .yk-legacy-tool .download-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; }
        #yk-portal-v2 .yk-legacy-tool .download-actions a { min-width: 220px; }
        #yk-portal-v2 .yk-legacy-tool .download-main { color: #183b3a; background: #f7c948; }
        #yk-portal-v2 .yk-legacy-tool .download-main:hover { color: #183b3a; background: #ffd86a; }
        #yk-portal-v2 .yk-legacy-tool .download-secondary { color: #fff; border-color: rgba(255,255,255,.65); }
        #yk-portal-v2 .yk-legacy-tool .download-meta { margin-top: 18px; color: #d5f3ee; font-size: .9rem; }
        #yk-portal-v2 .yk-legacy-tool .download-meta i { margin-right: 6px; }

        @media (max-width: 991px) {
            #yk-portal-v2 .yk-legacy-tool .pain-grid,#yk-portal-v2 .yk-legacy-tool  .feature-grid { grid-template-columns: repeat(2, 1fr); }
            #yk-portal-v2 .yk-legacy-tool .scenario-grid { grid-template-columns: repeat(2, 1fr); }
            #yk-portal-v2 .yk-legacy-tool .guide-layout { grid-template-columns: 1fr; }
        }
        @media (max-width: 767px) {
            #yk-portal-v2 .yk-legacy-tool { padding-top: 56px; }
            #yk-portal-v2 .yk-legacy-tool .hero { padding: 55px 0 48px; text-align: center; }
            #yk-portal-v2 .yk-legacy-tool .hero-copy { margin: 0 auto; }
            #yk-portal-v2 .yk-legacy-tool .hero .subtitle { margin: 0 auto; font-size: 1rem; }
            #yk-portal-v2 .yk-legacy-tool .hero-actions,#yk-portal-v2 .yk-legacy-tool  .hero-points { justify-content: center; }
            #yk-portal-v2 .yk-legacy-tool .section { padding: 54px 0; }
            #yk-portal-v2 .yk-legacy-tool .pain-grid,#yk-portal-v2 .yk-legacy-tool  .feature-grid,#yk-portal-v2 .yk-legacy-tool  .scenario-grid { grid-template-columns: 1fr; }
            #yk-portal-v2 .yk-legacy-tool .section-head { margin-bottom: 30px; }
            #yk-portal-v2 .yk-legacy-tool .shot-wrap { margin-top: 26px; padding: 7px; }
        }
        @media (max-width: 450px) {
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 1.8rem; }
            #yk-portal-v2 .yk-legacy-tool .hero-actions a { width: 100%; }
            #yk-portal-v2 .yk-legacy-tool .btn-primary-soft,#yk-portal-v2 .yk-legacy-tool  .btn-outline-soft { width: 100%; }
            #yk-portal-v2 .yk-legacy-tool .step { grid-template-columns: 34px 1fr; gap: 11px; padding: 16px 14px; }
            #yk-portal-v2 .yk-legacy-tool .step-number { width: 32px; height: 32px; font-size: .9rem; }
        }