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

        #yk-portal-v2 .yk-legacy-tool {
            --primary: #0e7490;
            --primary-light: #06b6d4;
            --primary-dark: #155e75;
            --accent: #0d9488;
            --accent-light: #14b8a6;
            --bg-light: #ecfeff;
            --bg-section: #f7fafc;
            --text-dark: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 6px 22px rgba(13,116,144,0.10);
            --shadow-lg: 0 14px 38px rgba(13,116,144,0.15);
            --radius: 14px;
        }
        #yk-portal-v2 .yk-legacy-tool * { box-sizing: border-box; }
        #yk-portal-v2 .yk-legacy-tool {
            font-family: 'Nunito', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            color: var(--text-body);
            line-height: 1.75;
            background: #fff;
        }

        /* ===== Hero (override global .hero 100vh) ===== */
        #yk-portal-v2 .yk-legacy-tool .zq-hero {
            height: auto !important;
            min-height: auto !important;
            background: linear-gradient(135deg, #155e75 0%, #0e7490 45%, #06b6d4 100%);
            padding: 5rem 0 4rem;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        #yk-portal-v2 .yk-legacy-tool .zq-hero::before {
            content: '';
            position: absolute; inset: 0;
            background: radial-gradient(circle at 22% 30%, rgba(255,255,255,0.10) 0%, transparent 45%),
                        radial-gradient(circle at 80% 75%, rgba(13,148,136,0.20) 0%, transparent 45%);
            pointer-events: none;
        }
        #yk-portal-v2 .yk-legacy-tool .zq-hero .container { position: relative; z-index: 1; max-width: 1000px; }
        #yk-portal-v2 .yk-legacy-tool .zq-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: 1.1rem;
            backdrop-filter: blur(8px);
        }
        #yk-portal-v2 .yk-legacy-tool .zq-hero h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: 1rem; letter-spacing: 0.5px; text-shadow: 0 2px 12px rgba(0,0,0,0.15); }
        #yk-portal-v2 .yk-legacy-tool .zq-hero .subtitle { font-size: 1.08rem; max-width: 760px; margin: 0 auto; opacity: 0.95; line-height: 1.85; }
        #yk-portal-v2 .yk-legacy-tool .zq-hero .badge-row { margin-top: 1.5rem; display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
        #yk-portal-v2 .yk-legacy-tool .zq-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 .zq-hero .hero-cta { margin-top: 2rem; }
        #yk-portal-v2 .yk-legacy-tool .btn-hero {
            display: inline-block; background: #fff; color: var(--primary-dark);
            font-weight: 800; font-size: 1.05rem; padding: 13px 38px; 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-hero: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 .hero-compat { margin-top: 0.9rem; font-size: 0.86rem; opacity: 0.9; }

        /* ===== Sections ===== */
        #yk-portal-v2 .yk-legacy-tool .zq-section { padding: 4.5rem 0; }
        #yk-portal-v2 .yk-legacy-tool .zq-section.alt { background: var(--bg-section); }
        #yk-portal-v2 .yk-legacy-tool .zq-section.soft { background: var(--bg-light); }
        #yk-portal-v2 .yk-legacy-tool .zq-title { text-align: center; margin-bottom: 3rem; }
        #yk-portal-v2 .yk-legacy-tool .zq-title .pre {
            display: inline-block; color: var(--primary); font-size: 0.8rem; 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 .zq-title h2 { font-size: 1.95rem; font-weight: 800; color: var(--text-dark); margin-bottom: 0.5rem; }
        #yk-portal-v2 .yk-legacy-tool .zq-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 .zq-title p { color: var(--text-muted); margin-top: 0.9rem; font-size: 1rem; max-width: 720px; margin-left: auto; margin-right: auto; }

        /* ===== Pain cards ===== */
        #yk-portal-v2 .yk-legacy-tool .pain-card {
            background: #fff; border-radius: var(--radius); padding: 1.9rem 1.7rem;
            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: 54px; height: 54px; border-radius: 14px; display: flex;
            align-items: center; justify-content: center; font-size: 1.35rem; color: #fff; margin-bottom: 1.1rem;
        }
        #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-card h5 { font-weight: 700; color: var(--text-dark); margin-bottom: 0.55rem; font-size: 1.05rem; }
        #yk-portal-v2 .yk-legacy-tool .pain-card p { color: var(--text-muted); font-size: 0.94rem; margin: 0; }

        /* ===== Feature cards ===== */
        #yk-portal-v2 .yk-legacy-tool .feature-card {
            background: #fff; border-radius: var(--radius); padding: 1.9rem 1.7rem;
            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: 1.3rem; color: #fff;
            margin-bottom: 1.1rem; box-shadow: 0 6px 14px rgba(13,116,144,0.18);
        }
        #yk-portal-v2 .yk-legacy-tool .feature-card h5 { font-weight: 700; color: var(--text-dark); font-size: 1.06rem; margin-bottom: 0.5rem; }
        #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(--accent), #06b6d4); }
        #yk-portal-v2 .yk-legacy-tool .grad-3 { background: linear-gradient(135deg, #f59e0b, #f97316); }
        #yk-portal-v2 .yk-legacy-tool .grad-4 { background: linear-gradient(135deg, #0ea5e9, #38bdf8); }
        #yk-portal-v2 .yk-legacy-tool .grad-5 { background: linear-gradient(135deg, #14b8a6, #0d9488); }
        #yk-portal-v2 .yk-legacy-tool .grad-6 { background: linear-gradient(135deg, #2563eb, #06b6d4); }

        /* ===== Screenshot ===== */
        #yk-portal-v2 .yk-legacy-tool .screenshot-wrapper { text-align: center; padding: 2.4rem 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);
        }

        /* ===== Scenario cards ===== */
        #yk-portal-v2 .yk-legacy-tool .scenario-card {
            background: #fff; border-radius: var(--radius); padding: 1.9rem 1.4rem;
            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: 62px; height: 62px; border-radius: 50%; display: flex;
            align-items: center; justify-content: center; margin: 0 auto 1.1rem; font-size: 1.45rem; color: #fff;
        }
        #yk-portal-v2 .yk-legacy-tool .scenario-card h5 { font-weight: 700; color: var(--text-dark); margin-bottom: 0.5rem; font-size: 1.04rem; }
        #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: 1.5rem; padding: 1.3rem 1.5rem;
            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;
        }
        #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: 42px; height: 42px; 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: 1.02rem; flex-shrink: 0; margin-right: 1.2rem;
            box-shadow: 0 6px 16px rgba(13,116,144,0.25);
        }
        #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: 6px; 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: 700; 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 { transition: transform 0.3s; color: var(--primary); flex-shrink: 0; margin-left: 12px; }
        #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; 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: 600px; padding: 0 1.5rem 1.3rem; }

        /* ===== Download ===== */
        #yk-portal-v2 .yk-legacy-tool .download-section {
            background: linear-gradient(135deg, #155e75, #0e7490 50%, #06b6d4);
            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(13,148,136,0.20) 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: 1.95rem; font-weight: 800; margin-bottom: 0.8rem; }
        #yk-portal-v2 .yk-legacy-tool .download-section p { opacity: 0.95; margin-bottom: 2rem; font-size: 1.04rem; }
        #yk-portal-v2 .yk-legacy-tool .dl-btns { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
        #yk-portal-v2 .yk-legacy-tool .btn-download {
            display: inline-flex; align-items: center; gap: 8px; background: #fff;
            color: var(--primary-dark); font-weight: 800; font-size: 1.05rem; padding: 13px 36px;
            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.alt { background: rgba(255,255,255,0.14); color: #fff; border: 1px solid rgba(255,255,255,0.5); }
        #yk-portal-v2 .yk-legacy-tool .btn-download.alt:hover { background: rgba(255,255,255,0.22); color: #fff; }
        #yk-portal-v2 .yk-legacy-tool .download-note { margin-top: 1.2rem; font-size: 0.88rem; opacity: 0.9; }

        /* ===== Responsive ===== */
        @media (max-width: 768px) {
            #yk-portal-v2 .yk-legacy-tool .zq-hero { padding: 3.6rem 0 3rem; }
            #yk-portal-v2 .yk-legacy-tool .zq-hero h1 { font-size: 1.8rem; }
            #yk-portal-v2 .yk-legacy-tool .zq-section { padding: 3.2rem 0; }
            #yk-portal-v2 .yk-legacy-tool .zq-title h2 { font-size: 1.5rem; }
            #yk-portal-v2 .yk-legacy-tool .step-item { padding: 1.05rem; }
            #yk-portal-v2 .yk-legacy-tool .step-item:hover { transform: none; }
        }
        @media (max-width: 576px) {
            #yk-portal-v2 .yk-legacy-tool .zq-hero h1 { font-size: 1.45rem; }
            #yk-portal-v2 .yk-legacy-tool .zq-hero .subtitle { font-size: 0.95rem; }
        }