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

        #yk-portal-v2 .yk-legacy-tool {
            --ink: #152338;
            --ink-soft: #405168;
            --muted: #6a7789;
            --paper: #ffffff;
            --mist: #f4f7f9;
            --line: #dce4e8;
            --teal: #087f75;
            --teal-dark: #075e57;
            --teal-soft: #e7f5f3;
            --cyan: #0891b2;
            --coral: #e85d45;
            --coral-soft: #fff0ec;
            --amber: #d99b22;
            --nav-bg-color: rgba(13, 25, 49, 0.92);
            --shadow-sm: 0 8px 24px rgba(21, 35, 56, 0.07);
            --shadow-lg: 0 22px 60px rgba(21, 35, 56, 0.14);
        }

        #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;
        }

        #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 0.35s ease;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        }

        #yk-portal-v2 .yk-legacy-tool .navbar.navbar-scrolled { padding: 6px 0; background-color: rgba(13, 25, 49, 0.98); }
        #yk-portal-v2 .yk-legacy-tool .navbar-brand { display: flex; align-items: center; font-weight: 700; }
        #yk-portal-v2 .yk-legacy-tool .navbar-brand img { height: 36px; width: auto; }
        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-nav .nav-link { color: rgba(255, 255, 255, 0.84); font-size: 0.92rem; }
        #yk-portal-v2 .yk-legacy-tool .navbar-dark .navbar-nav .nav-link:hover,#yk-portal-v2 .yk-legacy-tool 
        .navbar-dark .navbar-nav .active > .nav-link { color: #fff; }

        #yk-portal-v2 .yk-legacy-tool .hero {
            height: auto;
            min-height: auto;
            position: relative;
            overflow: hidden;
            padding: 86px 0 76px;
            color: #fff;
            background: #172535;
        }

        #yk-portal-v2 .yk-legacy-tool .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            opacity: 0.18;
            background-image:
                linear-gradient(rgba(255,255,255,0.12) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255,255,255,0.12) 1px, transparent 1px);
            background-size: 44px 44px;
            mask-image: linear-gradient(to right, transparent, #000 20%, #000 80%, transparent);
        }

        #yk-portal-v2 .yk-legacy-tool .hero::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            height: 5px;
            background: linear-gradient(90deg, var(--teal), var(--amber), var(--coral));
        }

        #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;
            margin-bottom: 18px;
            color: #b9eee8;
            font-size: 0.88rem;
            font-weight: 700;
            text-transform: uppercase;
        }

        #yk-portal-v2 .yk-legacy-tool .hero-kicker::before { content: ''; width: 28px; height: 2px; background: #6fd6ca; }
        #yk-portal-v2 .yk-legacy-tool .hero h1 { margin: 0 0 20px; color: #fff; font-size: 3.35rem; font-weight: 800; line-height: 1.16; }
        #yk-portal-v2 .yk-legacy-tool .hero .subtitle { max-width: 830px; margin: 0 auto 28px; color: #d7e2eb; font-size: 1.08rem; line-height: 1.9; }
        #yk-portal-v2 .yk-legacy-tool .hero .subtitle strong { color: #fff; }
        #yk-portal-v2 .yk-legacy-tool .hero-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }

        #yk-portal-v2 .yk-legacy-tool .hero-button {
            display: inline-flex;
            min-height: 48px;
            align-items: center;
            justify-content: center;
            gap: 9px;
            padding: 11px 24px;
            border: 1px solid transparent;
            border-radius: 6px;
            color: #fff;
            font-weight: 700;
            text-decoration: none;
            transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
        }

        #yk-portal-v2 .yk-legacy-tool .hero-button.primary { background: var(--coral); }
        #yk-portal-v2 .yk-legacy-tool .hero-button.secondary { border-color: rgba(255,255,255,0.46); background: rgba(255,255,255,0.06); }
        #yk-portal-v2 .yk-legacy-tool .hero-button:hover { color: #fff; text-decoration: none; transform: translateY(-2px); }
        #yk-portal-v2 .yk-legacy-tool .hero-button.primary:hover { background: #cf4d38; }
        #yk-portal-v2 .yk-legacy-tool .hero-button.secondary:hover { background: rgba(255,255,255,0.14); border-color: #fff; }

        #yk-portal-v2 .yk-legacy-tool .hero-facts {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 26px;
            margin-top: 35px;
            color: #c7d5df;
            font-size: 0.9rem;
        }

        #yk-portal-v2 .yk-legacy-tool .hero-facts span { display: inline-flex; align-items: center; gap: 7px; }
        #yk-portal-v2 .yk-legacy-tool .hero-facts i { color: #6fd6ca; }

        #yk-portal-v2 .yk-legacy-tool main section { scroll-margin-top: 74px; }
        #yk-portal-v2 .yk-legacy-tool .section { padding: 82px 0; }
        #yk-portal-v2 .yk-legacy-tool .section.soft { background: var(--mist); }
        #yk-portal-v2 .yk-legacy-tool .section.teal-band { background: var(--teal-soft); border-top: 1px solid #d7eeea; border-bottom: 1px solid #d7eeea; }

        #yk-portal-v2 .yk-legacy-tool .section-heading { max-width: 760px; margin: 0 auto 46px; text-align: center; }
        #yk-portal-v2 .yk-legacy-tool .eyebrow { display: block; margin-bottom: 8px; color: var(--teal); font-size: 0.82rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .section-heading h2 { margin-bottom: 12px; color: var(--ink); font-size: 2.15rem; font-weight: 800; line-height: 1.3; }
        #yk-portal-v2 .yk-legacy-tool .section-heading p { margin: 0; color: var(--muted); }

        #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: 22px; }
        #yk-portal-v2 .yk-legacy-tool .pain-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
        #yk-portal-v2 .yk-legacy-tool .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
        #yk-portal-v2 .yk-legacy-tool .scenario-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }

        #yk-portal-v2 .yk-legacy-tool .pain-item {
            position: relative;
            min-height: 210px;
            padding: 28px;
            border-top: 3px solid var(--coral);
            background: #fff;
            box-shadow: var(--shadow-sm);
        }

        #yk-portal-v2 .yk-legacy-tool .pain-index { color: #e9eef1; font-family: 'Poppins', sans-serif; font-size: 2.45rem; font-weight: 800; line-height: 1; }
        #yk-portal-v2 .yk-legacy-tool .pain-item h3 { margin: 13px 0 9px; color: var(--ink); font-size: 1.12rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .pain-item p { margin: 0; color: var(--muted); font-size: 0.94rem; }

        #yk-portal-v2 .yk-legacy-tool .feature-item {
            min-height: 246px;
            padding: 28px;
            border: 1px solid var(--line);
            border-radius: 6px;
            background: #fff;
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
        }

        #yk-portal-v2 .yk-legacy-tool .feature-item:hover { transform: translateY(-5px); border-color: #a9d6d1; box-shadow: var(--shadow-sm); }
        #yk-portal-v2 .yk-legacy-tool .feature-icon {
            display: inline-flex;
            width: 48px;
            height: 48px;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            border-radius: 5px;
            color: #fff;
            background: var(--teal);
            font-size: 1.15rem;
        }

        #yk-portal-v2 .yk-legacy-tool .feature-icon i {
            color: #fff;
            font-size: 1.15rem;
        }

        #yk-portal-v2 .yk-legacy-tool .feature-item:nth-child(2n) .feature-icon { background: var(--cyan); }
        #yk-portal-v2 .yk-legacy-tool .feature-item:nth-child(3n) .feature-icon { background: var(--coral); }
        #yk-portal-v2 .yk-legacy-tool .feature-item h3 { margin-bottom: 9px; color: var(--ink); font-size: 1.08rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .feature-item p { margin: 0; color: var(--muted); font-size: 0.93rem; }

        #yk-portal-v2 .yk-legacy-tool .mode-table-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow-sm); }
        #yk-portal-v2 .yk-legacy-tool .mode-table { width: 100%; min-width: 720px; margin: 0; border-collapse: collapse; }
        #yk-portal-v2 .yk-legacy-tool .mode-table th,#yk-portal-v2 .yk-legacy-tool 
        .mode-table td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
        #yk-portal-v2 .yk-legacy-tool .mode-table tr:last-child td { border-bottom: 0; }
        #yk-portal-v2 .yk-legacy-tool .mode-table th { color: #fff; background: var(--ink); font-size: 0.92rem; }
        #yk-portal-v2 .yk-legacy-tool .mode-table td:first-child { color: var(--teal-dark); font-weight: 800; white-space: nowrap; }
        #yk-portal-v2 .yk-legacy-tool .mode-table td { font-size: 0.92rem; }

        #yk-portal-v2 .yk-legacy-tool .screenshot-layout { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(260px, 0.65fr); gap: 34px; align-items: center; }
        #yk-portal-v2 .yk-legacy-tool .screenshot-frame {
            padding: 10px;
            border: 1px solid var(--line);
            border-radius: 6px;
            background: #fff;
            box-shadow: var(--shadow-lg);
        }
        #yk-portal-v2 .yk-legacy-tool .screenshot-frame img { display: block; width: 100%; height: auto; border-radius: 3px; }
        #yk-portal-v2 .yk-legacy-tool .screenshot-copy h2 { margin-bottom: 14px; color: var(--ink); font-size: 2rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .screenshot-copy p { color: var(--muted); }
        #yk-portal-v2 .yk-legacy-tool .check-list { margin: 22px 0 0; padding: 0; list-style: none; }
        #yk-portal-v2 .yk-legacy-tool .check-list li { display: flex; gap: 10px; margin-bottom: 12px; color: var(--ink-soft); }
        #yk-portal-v2 .yk-legacy-tool .check-list i { margin-top: 7px; color: var(--teal); }

        #yk-portal-v2 .yk-legacy-tool .scenario-item { padding: 5px 12px 5px 22px; border-left: 3px solid var(--amber); }
        #yk-portal-v2 .yk-legacy-tool .scenario-icon { margin-bottom: 15px; color: var(--coral); font-size: 1.55rem; }
        #yk-portal-v2 .yk-legacy-tool .scenario-item h3 { margin-bottom: 8px; color: var(--ink); font-size: 1.05rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .scenario-item p { margin: 0; color: var(--muted); font-size: 0.92rem; }

        #yk-portal-v2 .yk-legacy-tool .steps { position: relative; max-width: 900px; margin: 0 auto; }
        #yk-portal-v2 .yk-legacy-tool .steps::before { content: ''; position: absolute; top: 22px; bottom: 22px; left: 25px; width: 2px; background: #add8d3; }
        #yk-portal-v2 .yk-legacy-tool .step { position: relative; display: grid; grid-template-columns: 52px 1fr; gap: 22px; margin-bottom: 26px; }
        #yk-portal-v2 .yk-legacy-tool .step:last-child { margin-bottom: 0; }
        #yk-portal-v2 .yk-legacy-tool .step-number {
            position: relative;
            z-index: 1;
            display: flex;
            width: 52px;
            height: 52px;
            align-items: center;
            justify-content: center;
            border: 5px solid var(--teal-soft);
            border-radius: 50%;
            color: #fff;
            background: var(--teal);
            font-weight: 800;
        }
        #yk-portal-v2 .yk-legacy-tool .step-copy { padding: 4px 0 22px; border-bottom: 1px solid #cfe5e2; }
        #yk-portal-v2 .yk-legacy-tool .step-copy h3 { margin-bottom: 6px; color: var(--ink); font-size: 1.07rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .step-copy p { margin: 0; color: var(--muted); font-size: 0.95rem; }
        #yk-portal-v2 .yk-legacy-tool .step-note { display: inline-block; margin-top: 9px; color: var(--teal-dark); font-size: 0.85rem; font-weight: 700; }

        #yk-portal-v2 .yk-legacy-tool .notice {
            max-width: 900px;
            margin: 36px auto 0;
            padding: 18px 20px;
            border-left: 4px solid var(--amber);
            background: #fff9e9;
            color: #765719;
            font-size: 0.92rem;
        }

        #yk-portal-v2 .yk-legacy-tool .faq-list { max-width: 900px; margin: 0 auto; }
        #yk-portal-v2 .yk-legacy-tool .faq-item { margin-bottom: 12px; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; background: #fff; }
        #yk-portal-v2 .yk-legacy-tool .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 18px;
            padding: 18px 20px;
            border: 0;
            color: var(--ink);
            background: #fff;
            font-family: inherit;
            font-size: 1rem;
            font-weight: 800;
            text-align: left;
            cursor: pointer;
        }
        #yk-portal-v2 .yk-legacy-tool .faq-question:hover { background: #f8fbfb; }
        #yk-portal-v2 .yk-legacy-tool .faq-question i { flex: 0 0 auto; color: var(--teal); transition: transform 0.25s ease; }
        #yk-portal-v2 .yk-legacy-tool .faq-question[aria-expanded="true"] i { transform: rotate(180deg); }
        #yk-portal-v2 .yk-legacy-tool .faq-answer { display: none; padding: 0 20px 18px; color: var(--muted); font-size: 0.94rem; }
        #yk-portal-v2 .yk-legacy-tool .faq-answer.open { display: block; }

        #yk-portal-v2 .yk-legacy-tool .download-section {
            position: relative;
            overflow: hidden;
            padding: 76px 0;
            color: #fff;
            background: #087f75;
            text-align: center;
        }
        #yk-portal-v2 .yk-legacy-tool .download-section::before {
            content: '';
            position: absolute;
            inset: 0;
            opacity: 0.16;
            background-image: repeating-linear-gradient(135deg, transparent 0, transparent 22px, #fff 23px, transparent 24px);
        }
        #yk-portal-v2 .yk-legacy-tool .download-section .container { position: relative; z-index: 1; }
        #yk-portal-v2 .yk-legacy-tool .download-section h2 { margin-bottom: 10px; color: #fff; font-size: 2.15rem; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .download-section p { margin: 0 auto 28px; max-width: 720px; color: #def4f1; }
        #yk-portal-v2 .yk-legacy-tool .download-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
        #yk-portal-v2 .yk-legacy-tool .download-button {
            display: inline-flex;
            min-height: 50px;
            align-items: center;
            justify-content: center;
            gap: 9px;
            padding: 12px 28px;
            border: 2px solid #fff;
            border-radius: 6px;
            color: var(--teal-dark);
            background: #fff;
            font-weight: 800;
            text-decoration: none;
            transition: transform 0.2s ease, background 0.2s ease;
        }
        #yk-portal-v2 .yk-legacy-tool .download-button.backup { color: #fff; background: transparent; }
        #yk-portal-v2 .yk-legacy-tool .download-button:hover { color: var(--teal-dark); background: #f0fffd; text-decoration: none; transform: translateY(-2px); }
        #yk-portal-v2 .yk-legacy-tool .download-button.backup:hover { color: var(--teal-dark); background: #fff; }
        #yk-portal-v2 .yk-legacy-tool .system-note { display: inline-flex; align-items: center; gap: 8px; margin-top: 22px; color: #fff; font-size: 0.9rem; }

        @media (max-width: 991px) {
            #yk-portal-v2 .yk-legacy-tool .hero { padding: 70px 0 64px; }
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 2.7rem; }
            #yk-portal-v2 .yk-legacy-tool .feature-grid,#yk-portal-v2 .yk-legacy-tool 
            .pain-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
            #yk-portal-v2 .yk-legacy-tool .scenario-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
            #yk-portal-v2 .yk-legacy-tool .screenshot-layout { grid-template-columns: 1fr; }
            #yk-portal-v2 .yk-legacy-tool .screenshot-copy { max-width: 720px; }
        }

        @media (max-width: 767px) {
            #yk-portal-v2 .yk-legacy-tool { padding-top: 56px; }
            #yk-portal-v2 .yk-legacy-tool .hero { padding: 56px 0 50px; }
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 2.15rem; }
            #yk-portal-v2 .yk-legacy-tool .hero .subtitle { font-size: 0.98rem; }
            #yk-portal-v2 .yk-legacy-tool .hero-facts { gap: 12px 22px; }
            #yk-portal-v2 .yk-legacy-tool .section { padding: 62px 0; }
            #yk-portal-v2 .yk-legacy-tool .section-heading { margin-bottom: 34px; }
            #yk-portal-v2 .yk-legacy-tool .section-heading h2,#yk-portal-v2 .yk-legacy-tool 
            .download-section h2 { font-size: 1.72rem; }
            #yk-portal-v2 .yk-legacy-tool .feature-grid,#yk-portal-v2 .yk-legacy-tool 
            .pain-grid { grid-template-columns: 1fr; }
        }

        @media (max-width: 575px) {
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 1.75rem; }
            #yk-portal-v2 .yk-legacy-tool .hero-actions,#yk-portal-v2 .yk-legacy-tool 
            .download-actions { display: grid; grid-template-columns: 1fr; }
            #yk-portal-v2 .yk-legacy-tool .hero-button,#yk-portal-v2 .yk-legacy-tool 
            .download-button { width: 100%; }
            #yk-portal-v2 .yk-legacy-tool .hero-facts { display: grid; grid-template-columns: 1fr 1fr; text-align: left; }
            #yk-portal-v2 .yk-legacy-tool .scenario-grid { grid-template-columns: 1fr; }
            #yk-portal-v2 .yk-legacy-tool .pain-item,#yk-portal-v2 .yk-legacy-tool 
            .feature-item { min-height: auto; padding: 23px; }
            #yk-portal-v2 .yk-legacy-tool .step { gap: 14px; }
            #yk-portal-v2 .yk-legacy-tool .step-copy h3 { font-size: 1rem; }
            #yk-portal-v2 .yk-legacy-tool .screenshot-frame { padding: 5px; }
        }