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

        #yk-portal-v2 .yk-legacy-tool {
            --primary: #0284c7;
            --primary-light: #0ea5e9;
            --primary-dark: #075985;
            --accent: #f43f5e;
            --accent-light: #fb7185;
            --warm: #f59e0b;
            --warm-light: #fbbf24;
            --teal: #0d9488;
            --bg-light: #f0f9ff;
            --bg-section: #f8fafc;
            --bg-soft: #fff7ed;
            --text-dark: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
            --nav-bg-color: rgba(13, 25, 49, 0.85);
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 6px 22px rgba(2, 132, 199, 0.10);
            --shadow-lg: 0 14px 38px rgba(2, 132, 199, 0.15);
            --radius: 14px;
            --radius-sm: 10px;
        }

        #yk-portal-v2 .yk-legacy-tool * { box-sizing: border-box; }

        #yk-portal-v2 .yk-legacy-tool {
            padding-top: 60px;
            font-family: 'Nunito', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            color: var(--text-body);
            line-height: 1.75;
            background: #fff;
        }

        /* ===== Navbar ===== */
        #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(13,25,49,0.95); 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: var(--primary-light); 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: var(--primary-light) !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(13,25,49,0.98); padding: 20px; border-radius: 10px; 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; }
        }
        @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; }
        }

        /* ===== Hero ===== */
        #yk-portal-v2 .yk-legacy-tool .hero {
            background: linear-gradient(135deg, #075985 0%, #0284c7 45%, #0ea5e9 100%);
            padding: 5.5rem 0 4.5rem;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
            height: auto !important;
            min-height: auto !important;
        }
        #yk-portal-v2 .yk-legacy-tool .hero::before {
            content: '';
            position: absolute;
            top: 0; left: 0; width: 100%; height: 100%;
            background: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.10) 0%, transparent 45%),
                        radial-gradient(circle at 80% 70%, rgba(244,63,94,0.18) 0%, transparent 45%);
            pointer-events: none;
        }
        #yk-portal-v2 .yk-legacy-tool .hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background-image:
                linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
            background-size: 40px 40px;
            pointer-events: none;
        }
        #yk-portal-v2 .yk-legacy-tool .hero .container { position: relative; z-index: 1; }
        #yk-portal-v2 .yk-legacy-tool .hero .hero-tag {
            display: inline-block;
            background: rgba(255,255,255,0.15);
            border: 1px solid rgba(255,255,255,0.3);
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 1.2rem;
            backdrop-filter: blur(8px);
        }
        #yk-portal-v2 .yk-legacy-tool .hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            margin-bottom: 1rem;
            letter-spacing: 1px;
            text-shadow: 0 2px 12px rgba(0,0,0,0.15);
        }
        #yk-portal-v2 .yk-legacy-tool .hero .subtitle {
            font-size: 1.1rem;
            max-width: 800px;
            margin: 0 auto;
            opacity: 0.95;
            line-height: 1.85;
        }
        #yk-portal-v2 .yk-legacy-tool .hero .badge-row { margin-top: 1.6rem; display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
        #yk-portal-v2 .yk-legacy-tool .hero .badge-item {
            background: rgba(255,255,255,0.18);
            backdrop-filter: blur(6px);
            padding: 7px 18px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            border: 1px solid rgba(255,255,255,0.25);
        }
        #yk-portal-v2 .yk-legacy-tool .hero-stats {
            display: flex;
            justify-content: center;
            gap: 3rem;
            margin-top: 2.4rem;
            flex-wrap: wrap;
        }
        #yk-portal-v2 .yk-legacy-tool .hero-stat { text-align: center; }
        #yk-portal-v2 .yk-legacy-tool .hero-stat .num { font-size: 1.8rem; font-weight: 800; color: #fff; line-height: 1; }
        #yk-portal-v2 .yk-legacy-tool .hero-stat .label { font-size: 0.85rem; opacity: 0.85; margin-top: 6px; }

        /* ===== Section Common ===== */
        #yk-portal-v2 .yk-legacy-tool .section { padding: 4.5rem 0; }
        #yk-portal-v2 .yk-legacy-tool .section-alt { background: var(--bg-section); }
        #yk-portal-v2 .yk-legacy-tool .section-soft { background: var(--bg-soft); }
        #yk-portal-v2 .yk-legacy-tool .section-title { text-align: center; margin-bottom: 3rem; }
        #yk-portal-v2 .yk-legacy-tool .section-title .pre-title {
            display: inline-block;
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: 2px;
            text-transform: uppercase;
            margin-bottom: 0.6rem;
            padding: 4px 14px;
            background: var(--bg-light);
            border-radius: 16px;
        }
        #yk-portal-v2 .yk-legacy-tool .section-title h2 { font-size: 2rem; font-weight: 700; color: var(--text-dark); margin-bottom: 0.5rem; }
        #yk-portal-v2 .yk-legacy-tool .section-title h2:after { display: none; }
        #yk-portal-v2 .yk-legacy-tool .section-title .underline {
            width: 60px; height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 2px;
            margin: 0.6rem auto 0;
        }
        #yk-portal-v2 .yk-legacy-tool .section-title p { color: var(--text-muted); margin-top: 0.9rem; font-size: 1rem; max-width: 760px; margin-left: auto; margin-right: auto; }

        /* ===== Pain Points ===== */
        #yk-portal-v2 .yk-legacy-tool .pain-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 2rem 1.8rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            height: 100%;
            transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
            position: relative;
            overflow: hidden;
        }
        #yk-portal-v2 .yk-legacy-tool .pain-card::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.4s;
        }
        #yk-portal-v2 .yk-legacy-tool .pain-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }
        #yk-portal-v2 .yk-legacy-tool .pain-card:hover::before { transform: scaleX(1); }
        #yk-portal-v2 .yk-legacy-tool .pain-icon {
            width: 56px; height: 56px;
            border-radius: 14px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.4rem; color: #fff;
            margin-bottom: 1.2rem;
        }
        #yk-portal-v2 .yk-legacy-tool .pain-icon.red { background: linear-gradient(135deg, #ef4444, #f97316); }
        #yk-portal-v2 .yk-legacy-tool .pain-icon.amber { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
        #yk-portal-v2 .yk-legacy-tool .pain-icon.blue { background: linear-gradient(135deg, var(--primary), var(--primary-light)); }
        #yk-portal-v2 .yk-legacy-tool .pain-icon.teal { background: linear-gradient(135deg, var(--teal), #14b8a6); }
        #yk-portal-v2 .yk-legacy-tool .pain-card h5 { font-weight: 700; color: var(--text-dark); margin-bottom: 0.6rem; font-size: 1.06rem; }
        #yk-portal-v2 .yk-legacy-tool .pain-card p { color: var(--text-muted); font-size: 0.94rem; margin: 0; }

        /* ===== Features ===== */
        #yk-portal-v2 .yk-legacy-tool .feature-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 2rem 1.8rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            height: 100%;
            transition: transform 0.35s, box-shadow 0.35s;
        }
        #yk-portal-v2 .yk-legacy-tool .feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
        #yk-portal-v2 .yk-legacy-tool .feature-card .icon-wrap {
            width: 54px; height: 54px;
            border-radius: 14px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.35rem; color: #fff;
            margin-bottom: 1.1rem;
            box-shadow: 0 6px 14px rgba(2,132,199,0.18);
        }
        #yk-portal-v2 .yk-legacy-tool .feature-card h5 { font-weight: 700; color: var(--text-dark); font-size: 1.06rem; margin-bottom: 0.55rem; }
        #yk-portal-v2 .yk-legacy-tool .feature-card p { color: var(--text-muted); font-size: 0.93rem; margin: 0; line-height: 1.7; }
        #yk-portal-v2 .yk-legacy-tool .grad-1 { background: linear-gradient(135deg, var(--primary), var(--primary-light)); }
        #yk-portal-v2 .yk-legacy-tool .grad-2 { background: linear-gradient(135deg, var(--teal), #14b8a6); }
        #yk-portal-v2 .yk-legacy-tool .grad-3 { background: linear-gradient(135deg, var(--warm), #f97316); }
        #yk-portal-v2 .yk-legacy-tool .grad-4 { background: linear-gradient(135deg, var(--accent), #fb7185); }
        #yk-portal-v2 .yk-legacy-tool .grad-5 { background: linear-gradient(135deg, #0369a1, #0ea5e9); }
        #yk-portal-v2 .yk-legacy-tool .grad-6 { background: linear-gradient(135deg, #059669, #10b981); }
        #yk-portal-v2 .yk-legacy-tool .grad-7 { background: linear-gradient(135deg, #075985, #0284c7); }
        #yk-portal-v2 .yk-legacy-tool .grad-8 { background: linear-gradient(135deg, #f59e0b, #ef4444); }
        #yk-portal-v2 .yk-legacy-tool .grad-9 { background: linear-gradient(135deg, #0ea5e9, #f43f5e); }

        /* ===== Preset Cards ===== */
        #yk-portal-v2 .yk-legacy-tool .preset-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 1.8rem 1.6rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            height: 100%;
            transition: transform 0.3s, box-shadow 0.3s;
            position: relative;
            overflow: hidden;
        }
        #yk-portal-v2 .yk-legacy-tool .preset-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
        #yk-portal-v2 .yk-legacy-tool .preset-card .preset-icon {
            width: 48px; height: 48px;
            border-radius: 12px;
            display: flex; align-items: center; justify-content: center;
            color: #fff; font-size: 1.2rem;
            margin-bottom: 0.9rem;
        }
        #yk-portal-v2 .yk-legacy-tool .preset-card h6 { font-weight: 700; color: var(--text-dark); margin-bottom: 0.3rem; font-size: 1rem; }
        #yk-portal-v2 .yk-legacy-tool .preset-card .preset-spec {
            font-size: 0.78rem;
            color: var(--primary);
            font-weight: 700;
            background: var(--bg-light);
            padding: 3px 9px;
            border-radius: 4px;
            display: inline-block;
            margin-bottom: 0.7rem;
        }
        #yk-portal-v2 .yk-legacy-tool .preset-card p { color: var(--text-muted); font-size: 0.9rem; margin: 0; line-height: 1.7; }

        /* ===== Screenshot ===== */
        #yk-portal-v2 .yk-legacy-tool .screenshot-wrapper { text-align: center; padding: 1.5rem 0 0; }
        #yk-portal-v2 .yk-legacy-tool .screenshot-wrapper img {
            max-width: 100%; height: auto;
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
        }

        /* ===== Scenarios ===== */
        #yk-portal-v2 .yk-legacy-tool .scenario-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 2rem 1.5rem;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            height: 100%;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        #yk-portal-v2 .yk-legacy-tool .scenario-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
        #yk-portal-v2 .yk-legacy-tool .scenario-card .sc-icon {
            width: 64px; height: 64px;
            border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
            margin: 0 auto 1.2rem;
            font-size: 1.5rem; color: #fff;
        }
        #yk-portal-v2 .yk-legacy-tool .scenario-card h5 { font-weight: 700; color: var(--text-dark); margin-bottom: 0.5rem; font-size: 1.06rem; }
        #yk-portal-v2 .yk-legacy-tool .scenario-card p { color: var(--text-muted); font-size: 0.92rem; margin: 0; }

        /* ===== Steps ===== */
        #yk-portal-v2 .yk-legacy-tool .step-item {
            display: flex; align-items: flex-start;
            margin-bottom: 1.6rem; padding: 1.4rem 1.6rem;
            background: #fff; border-radius: var(--radius);
            box-shadow: var(--shadow-sm); border: 1px solid var(--border-color);
            transition: transform 0.3s, box-shadow 0.3s;
            position: relative;
        }
        #yk-portal-v2 .yk-legacy-tool .step-item:hover { transform: translateX(8px); box-shadow: var(--shadow-md); }
        #yk-portal-v2 .yk-legacy-tool .step-num {
            width: 44px; height: 44px; border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff; display: flex; align-items: center; justify-content: center;
            font-weight: 800; font-size: 1.05rem; flex-shrink: 0; margin-right: 1.2rem;
            box-shadow: 0 6px 16px rgba(2,132,199,0.25);
        }
        #yk-portal-v2 .yk-legacy-tool .step-content h6 { font-weight: 700; color: var(--text-dark); margin-bottom: 0.35rem; font-size: 1.02rem; }
        #yk-portal-v2 .yk-legacy-tool .step-content p { color: var(--text-muted); font-size: 0.94rem; margin: 0; }
        #yk-portal-v2 .yk-legacy-tool .step-tip {
            display: inline-block;
            margin-top: 0.5rem;
            padding: 3px 10px;
            background: var(--bg-light);
            color: var(--primary-dark);
            border-radius: 4px;
            font-size: 0.82rem;
        }

        /* ===== FAQ ===== */
        #yk-portal-v2 .yk-legacy-tool .faq-item {
            background: #fff; border-radius: var(--radius);
            margin-bottom: 1rem; box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color); overflow: hidden;
            transition: box-shadow 0.3s, border-color 0.3s;
        }
        #yk-portal-v2 .yk-legacy-tool .faq-item:hover { box-shadow: var(--shadow-md); border-color: var(--primary-light); }
        #yk-portal-v2 .yk-legacy-tool .faq-question {
            padding: 1.15rem 1.5rem; cursor: pointer;
            display: flex; align-items: center; justify-content: space-between;
            font-weight: 600; color: var(--text-dark);
            transition: background 0.2s; user-select: none;
            font-size: 1rem;
        }
        #yk-portal-v2 .yk-legacy-tool .faq-question:hover { background: var(--bg-light); }
        #yk-portal-v2 .yk-legacy-tool .faq-question i.fa-chevron-down { transition: transform 0.3s; color: var(--primary); }
        #yk-portal-v2 .yk-legacy-tool .faq-question.active i.fa-chevron-down { transform: rotate(180deg); }
        #yk-portal-v2 .yk-legacy-tool .faq-answer {
            max-height: 0; overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 1.5rem; color: var(--text-muted);
            line-height: 1.8; font-size: 0.95rem;
        }
        #yk-portal-v2 .yk-legacy-tool .faq-answer.open { max-height: 800px; padding: 0 1.5rem 1.3rem; }

        /* ===== Download ===== */
        #yk-portal-v2 .yk-legacy-tool .download-section {
            background: linear-gradient(135deg, #075985, #0284c7 50%, #0ea5e9);
            padding: 4.5rem 0;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        #yk-portal-v2 .yk-legacy-tool .download-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 30% 50%, rgba(244,63,94,0.18) 0%, transparent 50%),
                        radial-gradient(circle at 70% 80%, rgba(255,255,255,0.08) 0%, transparent 50%);
            pointer-events: none;
        }
        #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: 700; margin-bottom: 0.8rem; }
        #yk-portal-v2 .yk-legacy-tool .download-section p { opacity: 0.95; margin-bottom: 2rem; font-size: 1.05rem; }
        #yk-portal-v2 .yk-legacy-tool .btn-download {
            display: inline-block; background: #fff;
            color: var(--primary-dark); font-weight: 700; font-size: 1.1rem;
            padding: 14px 42px; border-radius: 50px; text-decoration: none;
            transition: all 0.3s; box-shadow: 0 8px 22px rgba(0,0,0,0.18);
        }
        #yk-portal-v2 .yk-legacy-tool .btn-download:hover {
            transform: translateY(-3px); box-shadow: 0 12px 30px rgba(0,0,0,0.25);
            color: var(--primary); text-decoration: none;
        }
        #yk-portal-v2 .yk-legacy-tool .btn-download i { margin-right: 8px; }
        #yk-portal-v2 .yk-legacy-tool .download-note { margin-top: 1.1rem; font-size: 0.88rem; opacity: 0.85; }
        #yk-portal-v2 .yk-legacy-tool .download-features {
            display: flex; justify-content: center; gap: 2rem;
            margin-top: 1.6rem; flex-wrap: wrap;
            font-size: 0.9rem; opacity: 0.95;
        }
        #yk-portal-v2 .yk-legacy-tool .download-features span { display: flex; align-items: center; gap: 6px; }

        /* ===== Notice ===== */
        #yk-portal-v2 .yk-legacy-tool .notice-block {
            background: #fff7ed;
            border-left: 4px solid var(--warm);
            border-radius: 8px;
            padding: 1rem 1.5rem;
            margin-top: 1.5rem;
            color: #92400e;
            font-size: 0.92rem;
            line-height: 1.75;
        }
        #yk-portal-v2 .yk-legacy-tool .notice-block strong { color: #b45309; }

        /* ===== Responsive ===== */
        @media (max-width: 768px) {
            #yk-portal-v2 .yk-legacy-tool .hero { padding: 4rem 0 3.2rem; }
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 2rem; }
            #yk-portal-v2 .yk-legacy-tool .hero-stats { gap: 1.5rem; }
            #yk-portal-v2 .yk-legacy-tool .section { padding: 3.2rem 0; }
            #yk-portal-v2 .yk-legacy-tool .section-title h2 { font-size: 1.6rem; }
            #yk-portal-v2 .yk-legacy-tool .step-item { padding: 1.1rem; }
            #yk-portal-v2 .yk-legacy-tool .step-item:hover { transform: none; }
        }
        @media (max-width: 576px) {
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 1.5rem; }
            #yk-portal-v2 .yk-legacy-tool .hero .subtitle { font-size: 0.95rem; }
            #yk-portal-v2 .yk-legacy-tool .hero-stat .num { font-size: 1.4rem; }
        }