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

        #yk-portal-v2 .yk-legacy-tool {
            --nav: #102b35;
            --hero: #123b45;
            --primary: #087f8c;
            --primary-dark: #075f69;
            --coral: #d95d48;
            --gold: #d99a22;
            --ink: #17242c;
            --body: #3e515b;
            --muted: #687b84;
            --surface: #f4f7f7;
            --soft: #e9f4f3;
            --line: #d9e2e3;
            --white: #ffffff;
            --shadow: 0 16px 38px rgba(21, 52, 61, 0.12);
        }

        #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(--body);
            background: var(--white);
            font-family: 'Nunito', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.75;
        }
        #yk-portal-v2 .yk-legacy-tool a { transition: color .2s ease, background-color .2s ease, border-color .2s ease, transform .2s ease; }
        #yk-portal-v2 .yk-legacy-tool img { max-width: 100%; }
        #yk-portal-v2 .yk-legacy-tool h1,#yk-portal-v2 .yk-legacy-tool  h2,#yk-portal-v2 .yk-legacy-tool  h3,#yk-portal-v2 .yk-legacy-tool  h4,#yk-portal-v2 .yk-legacy-tool  h5 { color: var(--ink); font-weight: 800; letter-spacing: 0; }

        #yk-portal-v2 .yk-legacy-tool .navbar {
            background: rgba(16, 43, 53, 0.96);
            padding: 10px 0;
            box-shadow: 0 6px 24px rgba(0, 0, 0, .14);
            backdrop-filter: blur(12px);
        }
        #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; }
        #yk-portal-v2 .yk-legacy-tool .brand-text { color: #fff; font-size: 1.42rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .nav-item { margin: 0 4px; }
        #yk-portal-v2 .yk-legacy-tool .nav-link {
            color: rgba(255, 255, 255, .9) !important;
            padding: 9px 12px !important;
            font-size: 14px;
            font-weight: 700;
            letter-spacing: 0;
        }
        #yk-portal-v2 .yk-legacy-tool .nav-link:hover,#yk-portal-v2 .yk-legacy-tool  .nav-item.active .nav-link { color: #72d5d7 !important; }
        #yk-portal-v2 .yk-legacy-tool .navbar-toggler { border-color: rgba(255, 255, 255, .35); }

        #yk-portal-v2 .yk-legacy-tool .hero {
            height: auto !important;
            min-height: auto !important;
            padding: 86px 0 80px;
            color: #fff;
            background: var(--hero);
            text-align: center;
        }
        #yk-portal-v2 .yk-legacy-tool .hero .container { max-width: 980px; }
        #yk-portal-v2 .yk-legacy-tool .hero-kicker {
            display: inline-flex;
            align-items: center;
            gap: 9px;
            margin-bottom: 20px;
            color: #bcecef;
            font-weight: 800;
            font-size: .93rem;
        }
        #yk-portal-v2 .yk-legacy-tool .hero h1 {
            max-width: 900px;
            margin: 0 auto 18px;
            color: #fff;
            font-size: 3.15rem;
            line-height: 1.2;
        }
        #yk-portal-v2 .yk-legacy-tool .hero-subtitle {
            max-width: 820px;
            margin: 0 auto;
            color: rgba(255, 255, 255, .88);
            font-size: 1.12rem;
            line-height: 1.9;
        }
        #yk-portal-v2 .yk-legacy-tool .hero-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
        #yk-portal-v2 .yk-legacy-tool .button-link {
            display: inline-flex;
            min-height: 48px;
            align-items: center;
            justify-content: center;
            gap: 9px;
            padding: 11px 22px;
            border: 2px solid transparent;
            border-radius: 6px;
            font-weight: 800;
            text-decoration: none;
        }
        #yk-portal-v2 .yk-legacy-tool .button-primary { color: #1f2a30; background: #f0b53d; }
        #yk-portal-v2 .yk-legacy-tool .button-primary:hover { color: #152027; background: #ffc95b; transform: translateY(-2px); text-decoration: none; }
        #yk-portal-v2 .yk-legacy-tool .button-ghost { color: #fff; border-color: rgba(255, 255, 255, .55); background: transparent; }
        #yk-portal-v2 .yk-legacy-tool .button-ghost:hover { color: #fff; border-color: #fff; background: rgba(255, 255, 255, .08); text-decoration: none; }
        #yk-portal-v2 .yk-legacy-tool .hero-points {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 18px 28px;
            margin: 28px 0 0;
            padding: 0;
            list-style: none;
            color: rgba(255, 255, 255, .82);
            font-size: .92rem;
        }
        #yk-portal-v2 .yk-legacy-tool .hero-points i { color: #78dfe0; margin-right: 6px; }

        #yk-portal-v2 .yk-legacy-tool .section { padding: 84px 0; }
        #yk-portal-v2 .yk-legacy-tool .section-alt { background: var(--surface); }
        #yk-portal-v2 .yk-legacy-tool .section-soft { background: var(--soft); }
        #yk-portal-v2 .yk-legacy-tool .section-head { max-width: 760px; margin: 0 auto 44px; text-align: center; }
        #yk-portal-v2 .yk-legacy-tool .eyebrow { display: block; margin-bottom: 9px; color: var(--primary-dark); font-size: .84rem; font-weight: 900; }
        #yk-portal-v2 .yk-legacy-tool .section-head h2 { margin-bottom: 13px; font-size: 2.15rem; line-height: 1.3; }
        #yk-portal-v2 .yk-legacy-tool .section-head p { margin: 0; color: var(--muted); font-size: 1.02rem; }

        #yk-portal-v2 .yk-legacy-tool .problem-grid,#yk-portal-v2 .yk-legacy-tool  .feature-grid,#yk-portal-v2 .yk-legacy-tool  .scene-grid { display: grid; gap: 24px; }
        #yk-portal-v2 .yk-legacy-tool .problem-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
        #yk-portal-v2 .yk-legacy-tool .problem-item { padding: 27px 8px 0; border-top: 4px solid var(--coral); }
        #yk-portal-v2 .yk-legacy-tool .problem-item:nth-child(2) { border-color: var(--gold); }
        #yk-portal-v2 .yk-legacy-tool .problem-item:nth-child(3) { border-color: var(--primary); }
        #yk-portal-v2 .yk-legacy-tool .problem-icon,#yk-portal-v2 .yk-legacy-tool  .feature-icon,#yk-portal-v2 .yk-legacy-tool  .scene-icon {
            display: inline-flex;
            width: 46px;
            height: 46px;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
            border-radius: 6px;
            color: #fff;
            background: var(--coral);
            font-size: 1.1rem;
        }
        #yk-portal-v2 .yk-legacy-tool .problem-icon i,#yk-portal-v2 .yk-legacy-tool  .feature-icon i,#yk-portal-v2 .yk-legacy-tool  .scene-icon i {
            color: inherit !important;
            font-size: inherit;
            line-height: 1;
        }
        #yk-portal-v2 .yk-legacy-tool .problem-item:nth-child(2) .problem-icon { color: #24323a; background: #f2bd50; }
        #yk-portal-v2 .yk-legacy-tool .problem-item:nth-child(3) .problem-icon { background: var(--primary); }
        #yk-portal-v2 .yk-legacy-tool .problem-item h3 { font-size: 1.18rem; }
        #yk-portal-v2 .yk-legacy-tool .problem-item p { margin: 0; color: var(--muted); }

        #yk-portal-v2 .yk-legacy-tool .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
        #yk-portal-v2 .yk-legacy-tool .feature-card {
            height: 100%;
            padding: 28px;
            border: 1px solid var(--line);
            border-radius: 6px;
            background: #fff;
            box-shadow: 0 7px 22px rgba(24, 57, 67, .06);
        }
        #yk-portal-v2 .yk-legacy-tool .feature-card:hover { border-color: #a9cbce; transform: translateY(-3px); box-shadow: var(--shadow); }
        #yk-portal-v2 .yk-legacy-tool .feature-icon { color: #fff; background: var(--primary); }
        #yk-portal-v2 .yk-legacy-tool .feature-card:nth-child(2) .feature-icon,#yk-portal-v2 .yk-legacy-tool  .feature-card:nth-child(5) .feature-icon { background: var(--coral); }
        #yk-portal-v2 .yk-legacy-tool .feature-card:nth-child(3) .feature-icon,#yk-portal-v2 .yk-legacy-tool  .feature-card:nth-child(6) .feature-icon { color: #1d2c33; background: #e9b545; }
        #yk-portal-v2 .yk-legacy-tool .feature-card h3 { margin-bottom: 10px; font-size: 1.16rem; }
        #yk-portal-v2 .yk-legacy-tool .feature-card p { margin: 0; color: var(--muted); }

        #yk-portal-v2 .yk-legacy-tool .screenshot-wrap { margin: 52px auto 0; text-align: center; }
        #yk-portal-v2 .yk-legacy-tool .screenshot-wrap img {
            display: block;
            width: 100%;
            height: auto;
            aspect-ratio: 2043 / 1397;
            border: 1px solid #c8d5d8;
            border-radius: 6px;
            background: #fff;
            box-shadow: var(--shadow);
        }
        #yk-portal-v2 .yk-legacy-tool .screenshot-wrap figcaption { margin-top: 14px; color: var(--muted); font-size: .91rem; }

        #yk-portal-v2 .yk-legacy-tool .scene-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
        #yk-portal-v2 .yk-legacy-tool .scene-item { padding: 0 20px 0 0; border-right: 1px solid var(--line); }
        #yk-portal-v2 .yk-legacy-tool .scene-item:last-child { border-right: 0; }
        #yk-portal-v2 .yk-legacy-tool .scene-icon { color: #fff; background: var(--primary-dark); }
        #yk-portal-v2 .yk-legacy-tool .scene-item:nth-child(2) .scene-icon { background: var(--coral); }
        #yk-portal-v2 .yk-legacy-tool .scene-item:nth-child(3) .scene-icon { color: #1c292f; background: #eab647; }
        #yk-portal-v2 .yk-legacy-tool .scene-item:nth-child(4) .scene-icon { background: #2c6e78; }
        #yk-portal-v2 .yk-legacy-tool .scene-item h3 { font-size: 1.13rem; }
        #yk-portal-v2 .yk-legacy-tool .scene-item p { margin: 0; color: var(--muted); font-size: .95rem; }

        #yk-portal-v2 .yk-legacy-tool .steps { max-width: 920px; margin: 0 auto; padding: 0; list-style: none; counter-reset: steps; }
        #yk-portal-v2 .yk-legacy-tool .step {
            position: relative;
            display: grid;
            grid-template-columns: 70px minmax(0, 1fr);
            gap: 22px;
            padding-bottom: 32px;
            counter-increment: steps;
        }
        #yk-portal-v2 .yk-legacy-tool .step:last-child { padding-bottom: 0; }
        #yk-portal-v2 .yk-legacy-tool .step::before {
            content: counter(steps);
            position: relative;
            z-index: 2;
            display: flex;
            width: 52px;
            height: 52px;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            color: #fff;
            background: var(--primary);
            font-size: 1.12rem;
            font-weight: 900;
        }
        #yk-portal-v2 .yk-legacy-tool .step:not(:last-child)::after {
            content: '';
            position: absolute;
            top: 52px;
            bottom: 0;
            left: 25px;
            width: 2px;
            background: #bdd5d7;
        }
        #yk-portal-v2 .yk-legacy-tool .step-content { padding: 4px 0 0; }
        #yk-portal-v2 .yk-legacy-tool .step-content h3 { margin-bottom: 7px; font-size: 1.18rem; }
        #yk-portal-v2 .yk-legacy-tool .step-content p { margin: 0; color: var(--muted); }
        #yk-portal-v2 .yk-legacy-tool .format-note {
            margin-top: 38px;
            padding: 22px 24px;
            border-left: 4px solid var(--gold);
            background: #fff;
            color: var(--body);
        }
        #yk-portal-v2 .yk-legacy-tool .format-note strong { color: var(--ink); }

        #yk-portal-v2 .yk-legacy-tool .faq-list { max-width: 920px; margin: 0 auto; }
        #yk-portal-v2 .yk-legacy-tool .faq-item { border-bottom: 1px solid var(--line); }
        #yk-portal-v2 .yk-legacy-tool .faq-item:first-child { border-top: 1px solid var(--line); }
        #yk-portal-v2 .yk-legacy-tool .faq-item summary {
            position: relative;
            padding: 22px 52px 22px 0;
            color: var(--ink);
            cursor: pointer;
            font-size: 1.06rem;
            font-weight: 800;
            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: '+';
            position: absolute;
            top: 20px;
            right: 5px;
            display: flex;
            width: 30px;
            height: 30px;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            color: #fff;
            background: var(--primary);
            font-size: 1.15rem;
        }
        #yk-portal-v2 .yk-legacy-tool .faq-item[open] summary::after { content: '−'; background: var(--coral); }
        #yk-portal-v2 .yk-legacy-tool .faq-answer { padding: 0 52px 23px 0; color: var(--muted); }
        #yk-portal-v2 .yk-legacy-tool .faq-answer p { margin: 0; }

        #yk-portal-v2 .yk-legacy-tool .download-section {
            padding: 82px 0;
            color: #fff;
            background: #0f4d58;
            text-align: center;
        }
        #yk-portal-v2 .yk-legacy-tool .download-section h2 { margin-bottom: 12px; color: #fff; font-size: 2.2rem; }
        #yk-portal-v2 .yk-legacy-tool .download-section > .container > p { max-width: 720px; margin: 0 auto; color: rgba(255, 255, 255, .83); }
        #yk-portal-v2 .yk-legacy-tool .download-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin: 28px 0 22px; }
        #yk-portal-v2 .yk-legacy-tool .download-actions .button-primary { min-width: 210px; }
        #yk-portal-v2 .yk-legacy-tool .support-line { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px 26px; color: rgba(255, 255, 255, .82); font-size: .92rem; }
        #yk-portal-v2 .yk-legacy-tool .support-line i { color: #82e0df; margin-right: 6px; }

        @media (max-width: 991px) {
            #yk-portal-v2 .yk-legacy-tool .navbar-collapse { margin-top: 12px; padding: 14px; border-radius: 6px; background: #0d252e; }
            #yk-portal-v2 .yk-legacy-tool .hero { padding: 72px 0 66px; }
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 2.45rem; }
            #yk-portal-v2 .yk-legacy-tool .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
            #yk-portal-v2 .yk-legacy-tool .scene-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
            #yk-portal-v2 .yk-legacy-tool .scene-item { padding: 0; border-right: 0; }
        }

        @media (max-width: 767px) {
            #yk-portal-v2 .yk-legacy-tool { padding-top: 56px; }
            #yk-portal-v2 .yk-legacy-tool .navbar-brand img { height: 34px; }
            #yk-portal-v2 .yk-legacy-tool .brand-text { font-size: 1.2rem; }
            #yk-portal-v2 .yk-legacy-tool .hero { padding: 58px 0 56px; }
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 2rem; }
            #yk-portal-v2 .yk-legacy-tool .hero-subtitle { font-size: 1rem; }
            #yk-portal-v2 .yk-legacy-tool .section { padding: 66px 0; }
            #yk-portal-v2 .yk-legacy-tool .section-head { margin-bottom: 34px; }
            #yk-portal-v2 .yk-legacy-tool .section-head h2,#yk-portal-v2 .yk-legacy-tool  .download-section h2 { font-size: 1.75rem; }
            #yk-portal-v2 .yk-legacy-tool .problem-grid,#yk-portal-v2 .yk-legacy-tool  .feature-grid,#yk-portal-v2 .yk-legacy-tool  .scene-grid { grid-template-columns: 1fr; }
            #yk-portal-v2 .yk-legacy-tool .feature-card { padding: 24px; }
            #yk-portal-v2 .yk-legacy-tool .step { grid-template-columns: 54px minmax(0, 1fr); gap: 15px; }
            #yk-portal-v2 .yk-legacy-tool .step::before { width: 44px; height: 44px; }
            #yk-portal-v2 .yk-legacy-tool .step:not(:last-child)::after { top: 44px; left: 21px; }
            #yk-portal-v2 .yk-legacy-tool .faq-item summary { padding-right: 44px; }
            #yk-portal-v2 .yk-legacy-tool .faq-answer { padding-right: 0; }
            #yk-portal-v2 .yk-legacy-tool .button-link { width: 100%; }
            #yk-portal-v2 .yk-legacy-tool .hero-actions,#yk-portal-v2 .yk-legacy-tool  .download-actions { align-items: stretch; flex-direction: column; }
        }