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

        #yk-portal-v2 .yk-legacy-tool {
            --ink: #12252e;
            --body: #41545d;
            --muted: #6a7d85;
            --line: #dce7e9;
            --surface: #ffffff;
            --soft: #f3f8f7;
            --teal: #117f82;
            --teal-dark: #0b5d64;
            --green: #22976f;
            --amber: #e79a2f;
            --coral: #d9644d;
            --nav-bg-color: rgba(12, 35, 45, 0.94);
            --shadow-sm: 0 8px 24px rgba(18, 56, 65, 0.08);
            --shadow-lg: 0 24px 60px rgba(10, 54, 61, 0.16);
        }

        #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(--surface);
            font-family: 'Nunito', 'Microsoft YaHei', sans-serif;
            line-height: 1.75;
        }
        #yk-portal-v2 .yk-legacy-tool a:focus-visible,#yk-portal-v2 .yk-legacy-tool  button:focus-visible,#yk-portal-v2 .yk-legacy-tool  summary:focus-visible {
            outline: 3px solid rgba(231, 154, 47, 0.55);
            outline-offset: 3px;
        }

        #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(8, 28, 37, 0.98); 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; margin-right: 10px; }
        #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; 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: #43c4b1; 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: #6dd9c7 !important; }
        #yk-portal-v2 .yk-legacy-tool .nav-item:hover .nav-link { color: #fff !important; transform: translateY(-3px); }
        #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; }

        #yk-portal-v2 .yk-legacy-tool .hero {
            height: auto !important;
            min-height: auto !important;
            padding: 5.2rem 0 4.8rem;
            color: #fff;
            background: #102f3a;
            position: relative;
            overflow: hidden;
        }
        #yk-portal-v2 .yk-legacy-tool .hero:before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.045) 1px, transparent 1px);
            background-size: 44px 44px;
            mask-image: linear-gradient(to bottom, #000, transparent 90%);
        }
        #yk-portal-v2 .yk-legacy-tool .hero .container { position: relative; z-index: 1; }
        #yk-portal-v2 .yk-legacy-tool .hero-kicker {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: #83e1d1;
            font-size: 0.88rem;
            font-weight: 800;
            text-transform: uppercase;
            margin-bottom: 1rem;
        }
        #yk-portal-v2 .yk-legacy-tool .hero-kicker:before { content: ''; width: 32px; height: 2px; background: var(--amber); }
        #yk-portal-v2 .yk-legacy-tool .hero h1 {
            max-width: 760px;
            margin: 0 0 1rem;
            font-size: 2.75rem;
            line-height: 1.25;
            font-weight: 800;
            letter-spacing: 0;
            color: #fff;
        }
        #yk-portal-v2 .yk-legacy-tool .hero .subtitle {
            max-width: 780px;
            margin: 0;
            color: #d5e8e9;
            font-size: 1.08rem;
            line-height: 1.9;
        }
        #yk-portal-v2 .yk-legacy-tool .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 1.75rem; }
        #yk-portal-v2 .yk-legacy-tool .btn-hero {
            min-height: 48px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 9px;
            padding: 11px 24px;
            border-radius: 6px;
            font-weight: 800;
            text-decoration: none !important;
            transition: transform .25s ease, background-color .25s ease;
        }
        #yk-portal-v2 .yk-legacy-tool .btn-hero:hover { transform: translateY(-2px); }
        #yk-portal-v2 .yk-legacy-tool .btn-hero.primary { background: var(--amber); color: #1c2b2f; }
        #yk-portal-v2 .yk-legacy-tool .btn-hero.primary:hover { background: #f2ad4e; color: #142126; }
        #yk-portal-v2 .yk-legacy-tool .btn-hero.secondary { border: 1px solid rgba(255,255,255,.35); color: #fff; background: rgba(255,255,255,.06); }
        #yk-portal-v2 .yk-legacy-tool .btn-hero.secondary:hover { background: rgba(255,255,255,.13); color: #fff; }
        #yk-portal-v2 .yk-legacy-tool .hero-facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 2.5rem; max-width: 650px; border-top: 1px solid rgba(255,255,255,.17); padding-top: 1.25rem; }
        #yk-portal-v2 .yk-legacy-tool .hero-fact { padding-right: 1.2rem; }
        #yk-portal-v2 .yk-legacy-tool .hero-fact strong { display: block; color: #fff; font-size: 1.25rem; line-height: 1.3; }
        #yk-portal-v2 .yk-legacy-tool .hero-fact span { color: #a9c6c9; font-size: .82rem; }

        #yk-portal-v2 .yk-legacy-tool .section { padding: 5rem 0; }
        #yk-portal-v2 .yk-legacy-tool .section-soft { background: var(--soft); }
        #yk-portal-v2 .yk-legacy-tool .section-head { max-width: 720px; margin-bottom: 2.7rem; }
        #yk-portal-v2 .yk-legacy-tool .section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
        #yk-portal-v2 .yk-legacy-tool .eyebrow { display: inline-block; margin-bottom: .55rem; color: var(--teal); font-weight: 800; font-size: .82rem; text-transform: uppercase; }
        #yk-portal-v2 .yk-legacy-tool .section-head h2 { margin: 0 0 .7rem; color: var(--ink); font-size: 2rem; line-height: 1.35; font-weight: 800; letter-spacing: 0; }
        #yk-portal-v2 .yk-legacy-tool .section-head p { margin: 0; color: var(--muted); font-size: 1rem; }

        #yk-portal-v2 .yk-legacy-tool .screenshot-band { padding: 3rem 0 5rem; background: #e9f2f1; }
        #yk-portal-v2 .yk-legacy-tool .screenshot-frame {
            position: relative;
            max-width: 1120px;
            margin: -1.4rem auto 0;
            padding: 9px;
            background: #fff;
            border: 1px solid #cbdadb;
            border-radius: 8px;
            box-shadow: var(--shadow-lg);
        }
        #yk-portal-v2 .yk-legacy-tool .screenshot-frame img { display: block; width: 100%; height: auto; border-radius: 4px; }
        #yk-portal-v2 .yk-legacy-tool .screenshot-caption { display: flex; justify-content: space-between; gap: 12px; padding: 14px 8px 5px; color: var(--muted); font-size: .88rem; }
        #yk-portal-v2 .yk-legacy-tool .screenshot-caption strong { color: var(--ink); }

        #yk-portal-v2 .yk-legacy-tool .pain-list { border-top: 1px solid var(--line); }
        #yk-portal-v2 .yk-legacy-tool .pain-row { display: grid; grid-template-columns: 72px minmax(180px, .75fr) 1.7fr; gap: 24px; align-items: start; padding: 1.55rem 0; border-bottom: 1px solid var(--line); }
        #yk-portal-v2 .yk-legacy-tool .pain-num { font-size: .8rem; font-weight: 800; color: var(--coral); padding-top: 5px; }
        #yk-portal-v2 .yk-legacy-tool .pain-row h3 { margin: 0; color: var(--ink); font-size: 1.08rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .pain-row p { margin: 0; color: var(--muted); }

        #yk-portal-v2 .yk-legacy-tool .feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
        #yk-portal-v2 .yk-legacy-tool .feature-card {
            height: 100%;
            padding: 1.6rem;
            background: #fff;
            border: 1px solid var(--line);
            border-top: 3px solid var(--teal);
            border-radius: 6px;
            box-shadow: var(--shadow-sm);
            transition: transform .25s ease, box-shadow .25s ease;
        }
        #yk-portal-v2 .yk-legacy-tool .feature-card:hover { transform: translateY(-4px); box-shadow: 0 14px 32px rgba(18,56,65,.12); }
        #yk-portal-v2 .yk-legacy-tool .feature-icon { width: 46px; height: 46px; display: flex; align-items: center; justify-content: center; margin-bottom: 1rem; border-radius: 6px; background: #e5f4f1; color: var(--teal-dark); font-size: 1.15rem; }
        #yk-portal-v2 .yk-legacy-tool .feature-card:nth-child(2n) { border-top-color: var(--green); }
        #yk-portal-v2 .yk-legacy-tool .feature-card:nth-child(3n) { border-top-color: var(--amber); }
        #yk-portal-v2 .yk-legacy-tool .feature-card h3 { margin: 0 0 .55rem; color: var(--ink); font-size: 1.05rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .feature-card p { margin: 0; color: var(--muted); font-size: .92rem; }
        #yk-portal-v2 .yk-legacy-tool .benefit { display: block; margin-top: .7rem; color: var(--teal-dark); font-size: .85rem; font-weight: 800; }

        #yk-portal-v2 .yk-legacy-tool .scope-strip { margin-top: 2rem; padding: 1.25rem 1.4rem; border-left: 4px solid var(--amber); background: #fff8ea; color: #695235; }
        #yk-portal-v2 .yk-legacy-tool .scope-strip strong { color: #4b3b28; }

        #yk-portal-v2 .yk-legacy-tool .scenario-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
        #yk-portal-v2 .yk-legacy-tool .scenario { display: grid; grid-template-columns: 48px 1fr; gap: 16px; padding: 1.7rem; background: #fff; }
        #yk-portal-v2 .yk-legacy-tool .scenario i { width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; background: #e6f3f1; color: var(--teal); border-radius: 50%; }
        #yk-portal-v2 .yk-legacy-tool .scenario h3 { margin: 0 0 .35rem; color: var(--ink); font-size: 1rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .scenario p { margin: 0; color: var(--muted); font-size: .9rem; }

        #yk-portal-v2 .yk-legacy-tool .steps { position: relative; max-width: 900px; margin: 0 auto; }
        #yk-portal-v2 .yk-legacy-tool .step { display: grid; grid-template-columns: 66px 1fr; gap: 22px; position: relative; padding-bottom: 1.65rem; }
        #yk-portal-v2 .yk-legacy-tool .step:not(:last-child):before { content: ''; position: absolute; left: 29px; top: 46px; bottom: -1px; width: 1px; background: #bad4d1; }
        #yk-portal-v2 .yk-legacy-tool .step-num { width: 58px; height: 42px; display: flex; align-items: center; justify-content: center; position: relative; z-index: 1; border: 1px solid #acd0cb; border-radius: 6px; color: var(--teal-dark); background: #fff; font-weight: 900; }
        #yk-portal-v2 .yk-legacy-tool .step-body { padding: .15rem 0 1.2rem; border-bottom: 1px solid var(--line); }
        #yk-portal-v2 .yk-legacy-tool .step h3 { margin: 0 0 .4rem; color: var(--ink); font-size: 1.03rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .step p { margin: 0; color: var(--muted); font-size: .94rem; }

        #yk-portal-v2 .yk-legacy-tool .faq-wrap { max-width: 900px; margin: 0 auto; border-top: 1px solid var(--line); }
        #yk-portal-v2 .yk-legacy-tool .faq-item { border-bottom: 1px solid var(--line); }
        #yk-portal-v2 .yk-legacy-tool .faq-item summary { display: flex; justify-content: space-between; gap: 18px; align-items: center; padding: 1.3rem .2rem; color: var(--ink); font-weight: 800; cursor: pointer; list-style: none; }
        #yk-portal-v2 .yk-legacy-tool .faq-item summary::-webkit-details-marker { display: none; }
        #yk-portal-v2 .yk-legacy-tool .faq-item summary:after { content: '+'; flex: 0 0 30px; width: 30px; height: 30px; display: flex; align-items: center; justify-content: center; border: 1px solid #b7cdca; border-radius: 50%; color: var(--teal); font-size: 1.15rem; }
        #yk-portal-v2 .yk-legacy-tool .faq-item[open] summary:after { content: '−'; background: var(--teal); color: #fff; border-color: var(--teal); }
        #yk-portal-v2 .yk-legacy-tool .faq-answer { padding: 0 3.2rem 1.35rem .2rem; color: var(--muted); }

        #yk-portal-v2 .yk-legacy-tool .download-section { padding: 4.8rem 0; color: #fff; background: #0d343b; }
        #yk-portal-v2 .yk-legacy-tool .download-inner { display: grid; grid-template-columns: 1.35fr .9fr; gap: 3rem; align-items: center; }
        #yk-portal-v2 .yk-legacy-tool .download-section h2 { margin: 0 0 .75rem; color: #fff; font-size: 2rem; font-weight: 800; letter-spacing: 0; }
        #yk-portal-v2 .yk-legacy-tool .download-section p { margin: 0; color: #c2d8da; }
        #yk-portal-v2 .yk-legacy-tool .download-actions { display: flex; flex-direction: column; gap: 10px; }
        #yk-portal-v2 .yk-legacy-tool .download-btn { display: flex; align-items: center; justify-content: center; gap: 10px; min-height: 50px; padding: 11px 18px; border-radius: 6px; text-decoration: none !important; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .download-btn.main { background: var(--amber); color: #17272b; }
        #yk-portal-v2 .yk-legacy-tool .download-btn.alt { color: #fff; border: 1px solid rgba(255,255,255,.35); background: rgba(255,255,255,.06); }
        #yk-portal-v2 .yk-legacy-tool .download-btn:hover { transform: translateY(-2px); color: inherit; }
        #yk-portal-v2 .yk-legacy-tool .download-note { margin-top: .7rem; color: #9fbabc; text-align: center; font-size: .84rem; }

        @media (max-width: 991px) {
            #yk-portal-v2 .yk-legacy-tool .navbar-collapse { background-color: rgba(8,28,37,0.99); padding: 20px; border-radius: 6px; 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; }
            #yk-portal-v2 .yk-legacy-tool .hero { padding: 4.5rem 0 4rem; }
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 2.25rem; }
            #yk-portal-v2 .yk-legacy-tool .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
            #yk-portal-v2 .yk-legacy-tool .pain-row { grid-template-columns: 55px 1fr; gap: 12px 18px; }
            #yk-portal-v2 .yk-legacy-tool .pain-row p { grid-column: 2; }
            #yk-portal-v2 .yk-legacy-tool .download-inner { grid-template-columns: 1fr; gap: 2rem; }
        }
        @media (max-width: 767px) {
            #yk-portal-v2 .yk-legacy-tool { padding-top: 56px; }
            #yk-portal-v2 .yk-legacy-tool .section { padding: 3.8rem 0; }
            #yk-portal-v2 .yk-legacy-tool .hero { padding: 3.7rem 0 3.4rem; }
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 1.85rem; }
            #yk-portal-v2 .yk-legacy-tool .hero .subtitle { font-size: .98rem; }
            #yk-portal-v2 .yk-legacy-tool .hero-facts { gap: 12px; }
            #yk-portal-v2 .yk-legacy-tool .hero-fact strong { font-size: 1.05rem; }
            #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 .screenshot-band { padding-bottom: 3.5rem; }
            #yk-portal-v2 .yk-legacy-tool .screenshot-caption { flex-direction: column; }
            #yk-portal-v2 .yk-legacy-tool .section-head h2,#yk-portal-v2 .yk-legacy-tool  .download-section h2 { font-size: 1.65rem; }
            #yk-portal-v2 .yk-legacy-tool .step { grid-template-columns: 52px 1fr; gap: 14px; }
            #yk-portal-v2 .yk-legacy-tool .step-num { width: 48px; height: 38px; }
            #yk-portal-v2 .yk-legacy-tool .step:not(:last-child):before { left: 23px; top: 40px; }
        }
        @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-actions .btn-hero { width: 100%; }
            #yk-portal-v2 .yk-legacy-tool .hero-facts { grid-template-columns: 1fr; }
            #yk-portal-v2 .yk-legacy-tool .hero-fact { display: flex; justify-content: space-between; align-items: baseline; padding: 0 0 .55rem; border-bottom: 1px solid rgba(255,255,255,.1); }
            #yk-portal-v2 .yk-legacy-tool .pain-row { grid-template-columns: 1fr; }
            #yk-portal-v2 .yk-legacy-tool .pain-row p { grid-column: 1; }
            #yk-portal-v2 .yk-legacy-tool .scenario { grid-template-columns: 40px 1fr; padding: 1.35rem; }
            #yk-portal-v2 .yk-legacy-tool .scenario i { width: 38px; height: 38px; }
            #yk-portal-v2 .yk-legacy-tool .faq-answer { padding-right: .2rem; }
        }
        @media (prefers-reduced-motion: reduce) {
            #yk-portal-v2 .yk-legacy-tool { scroll-behavior: auto; }
            #yk-portal-v2 .yk-legacy-tool *,#yk-portal-v2 .yk-legacy-tool  *:before,#yk-portal-v2 .yk-legacy-tool  *:after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
        }