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

        #yk-portal-v2 .yk-legacy-tool {
            --ink: #17324d;
            --body: #496277;
            --muted: #6d8293;
            --line: #dce8ee;
            --wash: #f3f8fa;
            --teal: #118b87;
            --teal-dark: #0b6e72;
            --blue: #2368b3;
            --blue-dark: #174d87;
            --amber: #e59b21;
            --coral: #dc6b55;
            --shadow: 0 12px 32px rgba(23, 68, 91, .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;
            font-family: 'Nunito', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            color: var(--body);
            background: #fff;
            line-height: 1.75;
        }
        /* 保留站点导航的视觉和交互规则，避免全局样式放大 logo。 */
        #yk-portal-v2 .yk-legacy-tool .navbar {
            background-color: rgba(13, 25, 49, .88);
            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; transition: all .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,.95); font-weight: 700; font-size: 1.5rem; transition: all .3s ease; text-shadow: 0 2px 10px rgba(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 .3s ease; color: rgba(255,255,255,.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: #4ca5da; 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: #64b1e3 !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; }
        @media (max-width: 991px) {
            #yk-portal-v2 .yk-legacy-tool .navbar-collapse { background-color: rgba(13,25,49,.98); padding: 20px; border-radius: 10px; margin-top: 15px; 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; }
            #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: 5.3rem 0 4.2rem;
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
            background: linear-gradient(135deg, #164c82 0%, #1f6e9e 52%, #168b86 100%);
        }
        #yk-portal-v2 .yk-legacy-tool .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            opacity: .18;
            background-image: linear-gradient(32deg, transparent 42%, rgba(255,255,255,.20) 43%, transparent 44%), linear-gradient(148deg, transparent 52%, rgba(255,255,255,.14) 53%, transparent 54%);
            background-size: 56px 56px, 74px 74px;
        }
        #yk-portal-v2 .yk-legacy-tool .hero .container { position: relative; z-index: 1; }
        #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 2.65rem; font-weight: 800; letter-spacing: .5px; margin: 1rem 0 .9rem; text-shadow: 0 3px 14px rgba(0,0,0,.18); }
        #yk-portal-v2 .yk-legacy-tool .hero .hero-tag {
            display: inline-block;
            padding: 6px 18px;
            border: 1px solid rgba(255,255,255,.32);
            border-radius: 22px;
            background: rgba(255,255,255,.14);
            font-size: .86rem;
            font-weight: 700;
        }
        #yk-portal-v2 .yk-legacy-tool .hero .subtitle { max-width: 850px; margin: 0 auto; font-size: 1.08rem; line-height: 1.9; opacity: .96; }
        #yk-portal-v2 .yk-legacy-tool .hero-badges { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-top: 1.45rem; }
        #yk-portal-v2 .yk-legacy-tool .hero-badges span { padding: 6px 15px; border: 1px solid rgba(255,255,255,.28); border-radius: 20px; background: rgba(255,255,255,.14); font-size: .84rem; font-weight: 700; }
        #yk-portal-v2 .yk-legacy-tool .hero-stats { display: flex; justify-content: center; flex-wrap: wrap; gap: 2.8rem; margin-top: 2rem; }
        #yk-portal-v2 .yk-legacy-tool .hero-stat .num { color: #fff; font-size: 1.75rem; line-height: 1.1; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .hero-stat .label { margin-top: 5px; font-size: .82rem; opacity: .85; }
        #yk-portal-v2 .yk-legacy-tool .section { padding: 4.3rem 0; }
        #yk-portal-v2 .yk-legacy-tool .section.alt { background: var(--wash); }
        #yk-portal-v2 .yk-legacy-tool .section-title { text-align: center; max-width: 780px; margin: 0 auto 2.7rem; }
        #yk-portal-v2 .yk-legacy-tool .section-title .eyebrow { display: inline-block; padding: 3px 13px; border-radius: 16px; color: var(--teal-dark); background: #e0f3f0; font-size: .82rem; font-weight: 800; letter-spacing: 1.5px; }
        #yk-portal-v2 .yk-legacy-tool .section-title h2 { color: var(--ink); font-size: 2rem; font-weight: 800; margin: .65rem 0 .45rem; }
        #yk-portal-v2 .yk-legacy-tool .section-title h2::after { display: none; }
        #yk-portal-v2 .yk-legacy-tool .section-title p { color: var(--muted); margin: 0; }
        #yk-portal-v2 .yk-legacy-tool .section-title .rule { width: 58px; height: 4px; margin: .7rem auto .9rem; border-radius: 3px; background: linear-gradient(90deg, var(--blue), var(--teal)); }
        #yk-portal-v2 .yk-legacy-tool .pain-card,#yk-portal-v2 .yk-legacy-tool  .feature-card,#yk-portal-v2 .yk-legacy-tool  .scene-card,#yk-portal-v2 .yk-legacy-tool  .step-card { height: 100%; background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 5px 18px rgba(26, 73, 96, .06); }
        #yk-portal-v2 .yk-legacy-tool .pain-card { position: relative; overflow: hidden; padding: 1.55rem 1.4rem; }
        #yk-portal-v2 .yk-legacy-tool .pain-card::before { content: ''; position: absolute; left: 0; top: 0; width: 100%; height: 4px; background: linear-gradient(90deg, var(--coral), var(--amber)); }
        #yk-portal-v2 .yk-legacy-tool .pain-icon,#yk-portal-v2 .yk-legacy-tool  .feature-icon { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; border-radius: 13px; color: #fff; font-size: 1.2rem; margin: 0 0 1rem; }
        #yk-portal-v2 .yk-legacy-tool .pain-icon i,#yk-portal-v2 .yk-legacy-tool  .feature-card .feature-icon i { color: #fff !important; font-size: 1.2rem !important; line-height: 1; }
        #yk-portal-v2 .yk-legacy-tool .pain-icon { background: linear-gradient(135deg, #d96454, #efaa34); }
        #yk-portal-v2 .yk-legacy-tool .pain-card h3,#yk-portal-v2 .yk-legacy-tool  .feature-card h3,#yk-portal-v2 .yk-legacy-tool  .scene-card h3,#yk-portal-v2 .yk-legacy-tool  .step-card h3 { color: var(--ink); font-size: 1.08rem; font-weight: 800; margin-bottom: .45rem; }
        #yk-portal-v2 .yk-legacy-tool .pain-card p,#yk-portal-v2 .yk-legacy-tool  .feature-card p,#yk-portal-v2 .yk-legacy-tool  .scene-card p,#yk-portal-v2 .yk-legacy-tool  .step-card p { color: var(--muted); font-size: .93rem; margin: 0; }
        #yk-portal-v2 .yk-legacy-tool .feature-intro { display: flex; align-items: center; gap: 2rem; margin-bottom: 2.1rem; padding: 1.3rem; border: 1px solid var(--line); border-radius: 12px; background: #fff; box-shadow: var(--shadow); }
        #yk-portal-v2 .yk-legacy-tool .feature-intro figure { flex: 0 0 43%; margin: 0; }
        #yk-portal-v2 .yk-legacy-tool .feature-intro img { display: block; width: 100%; max-height: 340px; object-fit: contain; border-radius: 8px; border: 1px solid #d6e1e8; background: #edf3f6; }
        #yk-portal-v2 .yk-legacy-tool .feature-intro figcaption { margin-top: .5rem; color: var(--muted); font-size: .8rem; text-align: center; }
        #yk-portal-v2 .yk-legacy-tool .feature-intro-copy { flex: 1; }
        #yk-portal-v2 .yk-legacy-tool .feature-intro-copy h3 { color: var(--ink); font-size: 1.45rem; font-weight: 800; margin-bottom: .65rem; }
        #yk-portal-v2 .yk-legacy-tool .feature-intro-copy p { margin-bottom: .8rem; }
        #yk-portal-v2 .yk-legacy-tool .feature-list { margin: 0; padding: 0; list-style: none; }
        #yk-portal-v2 .yk-legacy-tool .feature-list li { display: flex; gap: .55rem; align-items: flex-start; margin: .3rem 0; color: var(--body); font-size: .9rem; }
        #yk-portal-v2 .yk-legacy-tool .feature-list i { color: var(--teal); margin-top: .32rem; }
        #yk-portal-v2 .yk-legacy-tool .feature-card { padding: 1.5rem 1.35rem; transition: transform .25s ease, box-shadow .25s ease; }
        #yk-portal-v2 .yk-legacy-tool .feature-card:hover,#yk-portal-v2 .yk-legacy-tool  .scene-card:hover,#yk-portal-v2 .yk-legacy-tool  .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
        #yk-portal-v2 .yk-legacy-tool .feature-icon.blue { background: linear-gradient(135deg, var(--blue), #4590cf); }
        #yk-portal-v2 .yk-legacy-tool .feature-icon.teal { background: linear-gradient(135deg, var(--teal-dark), #2ca99d); }
        #yk-portal-v2 .yk-legacy-tool .feature-icon.amber { background: linear-gradient(135deg, #d98916, #efb842); }
        #yk-portal-v2 .yk-legacy-tool .feature-icon.coral { background: linear-gradient(135deg, #c95e4e, #e88766); }
        #yk-portal-v2 .yk-legacy-tool .feature-icon.navy { background: linear-gradient(135deg, #234d6e, #4b7794); }
        #yk-portal-v2 .yk-legacy-tool .feature-icon.green { background: linear-gradient(135deg, #2d806e, #5bab78); }
        #yk-portal-v2 .yk-legacy-tool .scene-card { padding: 1.4rem 1.3rem; border-top: 4px solid var(--blue); }
        #yk-portal-v2 .yk-legacy-tool .scene-card:nth-child(2) { border-top-color: var(--teal); }
        #yk-portal-v2 .yk-legacy-tool .scene-card:nth-child(3) { border-top-color: var(--amber); }
        #yk-portal-v2 .yk-legacy-tool .scene-card:nth-child(4) { border-top-color: var(--coral); }
        #yk-portal-v2 .yk-legacy-tool .scene-card h3 i { margin-right: .4rem; color: var(--blue); }
        #yk-portal-v2 .yk-legacy-tool .scene-card:nth-child(2) h3 i { color: var(--teal); }
        #yk-portal-v2 .yk-legacy-tool .scene-card:nth-child(3) h3 i { color: var(--amber); }
        #yk-portal-v2 .yk-legacy-tool .scene-card:nth-child(4) h3 i { color: var(--coral); }
        #yk-portal-v2 .yk-legacy-tool .steps { counter-reset: usage; }
        #yk-portal-v2 .yk-legacy-tool .step-card { position: relative; padding: 1.5rem 1.3rem 1.45rem 4.15rem; }
        #yk-portal-v2 .yk-legacy-tool .step-card::before { counter-increment: usage; content: counter(usage); position: absolute; left: 1.2rem; top: 1.45rem; width: 2.2rem; height: 2.2rem; display: 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-card h3 { margin-bottom: .4rem; }
        #yk-portal-v2 .yk-legacy-tool .tips { margin-top: 1.6rem; padding: 1rem 1.2rem; border-left: 4px solid var(--amber); border-radius: 0 8px 8px 0; background: #fff8e9; color: #775a20; font-size: .9rem; }
        #yk-portal-v2 .yk-legacy-tool .faq-list { max-width: 900px; margin: 0 auto; }
        #yk-portal-v2 .yk-legacy-tool .faq-item { overflow: hidden; margin-bottom: .85rem; border: 1px solid var(--line); border-radius: 10px; background: #fff; box-shadow: 0 4px 13px rgba(26, 73, 96, .05); }
        #yk-portal-v2 .yk-legacy-tool .faq-question { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 1.25rem; cursor: pointer; color: var(--ink); font-weight: 800; font-size: .98rem; user-select: none; }
        #yk-portal-v2 .yk-legacy-tool .faq-question:hover { background: #f2f8fa; }
        #yk-portal-v2 .yk-legacy-tool .faq-question > span { display: flex; align-items: center; gap: .55rem; }
        #yk-portal-v2 .yk-legacy-tool .faq-question > span i { color: var(--teal); }
        #yk-portal-v2 .yk-legacy-tool .faq-question > i { color: var(--blue); transition: transform .25s ease; }
        #yk-portal-v2 .yk-legacy-tool .faq-question.active > i { transform: rotate(180deg); }
        #yk-portal-v2 .yk-legacy-tool .faq-answer { max-height: 0; overflow: hidden; padding: 0 1.25rem; color: var(--muted); font-size: .92rem; line-height: 1.8; transition: max-height .35s ease, padding .35s ease; }
        #yk-portal-v2 .yk-legacy-tool .faq-answer.open { max-height: 360px; padding: 0 1.25rem 1.1rem; }
        #yk-portal-v2 .yk-legacy-tool .download-section { position: relative; overflow: hidden; padding: 4.2rem 0; color: #fff; text-align: center; background: linear-gradient(135deg, #174d87, #1f6e9e 58%, #168b86); }
        #yk-portal-v2 .yk-legacy-tool .download-section::before { content: ''; position: absolute; inset: 0; opacity: .18; background-image: linear-gradient(45deg, transparent 48%, rgba(255,255,255,.2) 49%, transparent 50%); background-size: 42px 42px; }
        #yk-portal-v2 .yk-legacy-tool .download-section .container { position: relative; z-index: 1; }
        #yk-portal-v2 .yk-legacy-tool .download-section h2 { font-size: 2rem; font-weight: 800; margin-bottom: .55rem; }
        #yk-portal-v2 .yk-legacy-tool .download-section p { max-width: 680px; margin: 0 auto 1.55rem; opacity: .94; }
        #yk-portal-v2 .yk-legacy-tool .btn-download { display: inline-block; padding: 12px 28px; border-radius: 8px; color: var(--blue-dark); background: #fff; font-size: 1rem; font-weight: 800; text-decoration: none; box-shadow: 0 8px 20px rgba(0,0,0,.18); transition: transform .25s, box-shadow .25s; }
        #yk-portal-v2 .yk-legacy-tool .btn-download:hover { color: var(--blue-dark); text-decoration: none; transform: translateY(-3px); box-shadow: 0 12px 26px rgba(0,0,0,.23); }
        #yk-portal-v2 .yk-legacy-tool .btn-download i { margin-right: .45rem; }
        #yk-portal-v2 .yk-legacy-tool .btn-backup { margin-left: .55rem; color: #fff; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.5); box-shadow: none; }
        #yk-portal-v2 .yk-legacy-tool .btn-backup:hover { color: #fff; }
        #yk-portal-v2 .yk-legacy-tool .download-features { display: flex; justify-content: center; flex-wrap: wrap; gap: 1.4rem 2rem; margin-top: 1.6rem; font-size: .9rem; }
        #yk-portal-v2 .yk-legacy-tool .download-features span { display: flex; align-items: center; gap: .4rem; }
        #yk-portal-v2 .yk-legacy-tool .download-features i { color: #a9ebd5; }
        #yk-portal-v2 .yk-legacy-tool .download-note { margin-top: 1rem; opacity: .78; font-size: .82rem; }
        @media (max-width: 768px) {
            #yk-portal-v2 .yk-legacy-tool .hero { padding: 4.3rem 0 3.3rem; }
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 2rem; }
            #yk-portal-v2 .yk-legacy-tool .section { padding: 3.3rem 0; }
            #yk-portal-v2 .yk-legacy-tool .section-title h2 { font-size: 1.65rem; }
            #yk-portal-v2 .yk-legacy-tool .feature-intro { display: block; }
            #yk-portal-v2 .yk-legacy-tool .feature-intro figure { margin-bottom: 1.25rem; }
            #yk-portal-v2 .yk-legacy-tool .feature-intro img { max-height: 300px; }
            #yk-portal-v2 .yk-legacy-tool .btn-backup { margin: .8rem 0 0; }
        }
        @media (max-width: 575px) {
            #yk-portal-v2 .yk-legacy-tool { padding-top: 56px; }
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 1.62rem; }
            #yk-portal-v2 .yk-legacy-tool .hero .subtitle { font-size: .95rem; }
            #yk-portal-v2 .yk-legacy-tool .hero-stats { gap: 1.25rem; }
            #yk-portal-v2 .yk-legacy-tool .hero-stat .num { font-size: 1.4rem; }
            #yk-portal-v2 .yk-legacy-tool .section-title h2 { font-size: 1.45rem; }
            #yk-portal-v2 .yk-legacy-tool .faq-question { font-size: .92rem; padding: .9rem 1rem; }
            #yk-portal-v2 .yk-legacy-tool .faq-answer.open { padding-left: 1rem; padding-right: 1rem; }
        }