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

        #yk-portal-v2 .yk-legacy-tool {
            --primary: #0891b2;
            --primary-light: #06b6d4;
            --primary-dark: #0e7490;
            --accent: #f59e0b;
            --accent-2: #14b8a6;
            --bg-light: #f0fdfa;
            --bg-section: #f8fafc;
            --text-dark: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.07);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.09);
            --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
            --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: 1.7;
            background: #ffffff;
        }

        /* ===== Hero Banner（覆盖 style.css 全局 .hero 高度） ===== */
        #yk-portal-v2 .yk-legacy-tool .hero {
            height: auto !important;
            min-height: auto !important;
            background: linear-gradient(135deg, #083344 0%, #0e7490 45%, #0891b2 100%);
            padding: 7rem 0 4.5rem;
            margin-top: 60px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        #yk-portal-v2 .yk-legacy-tool .hero::before {
            content: '';
            position: absolute; inset: 0;
            background:
                radial-gradient(circle at 20% 30%, rgba(245,158,11,0.18) 0%, transparent 45%),
                radial-gradient(circle at 80% 70%, rgba(20,184,166,0.18) 0%, transparent 45%),
                radial-gradient(circle at 50% 100%, rgba(255,255,255,0.06) 0%, transparent 55%);
            pointer-events: none;
        }
        #yk-portal-v2 .yk-legacy-tool .hero::after {
            content: '';
            position: absolute; left: 0; right: 0; bottom: -1px; height: 60px;
            background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 60" preserveAspectRatio="none"><path fill="%23ffffff" d="M0,30 C240,60 480,0 720,30 C960,60 1200,0 1440,30 L1440,60 L0,60 Z"/></svg>') no-repeat center / cover;
            pointer-events: none;
        }
        #yk-portal-v2 .yk-legacy-tool .hero .container { position: relative; z-index: 2; }
        #yk-portal-v2 .yk-legacy-tool .hero h1 {
            font-size: 2.6rem; font-weight: 800;
            margin-bottom: 1rem; letter-spacing: 1px;
            text-shadow: 0 4px 22px rgba(0,0,0,0.25);
        }
        #yk-portal-v2 .yk-legacy-tool .hero .subtitle {
            font-size: 1.1rem; max-width: 820px; 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: 999px;
            font-size: 0.88rem; font-weight: 600;
            border: 1px solid rgba(255,255,255,0.18);
        }
        #yk-portal-v2 .yk-legacy-tool .hero-screenshot-wrap {
            margin: 2.4rem auto 0;
            max-width: 1000px;
            padding: 0 12px;
        }
        #yk-portal-v2 .yk-legacy-tool .hero-screenshot-wrap img {
            width: 100%;
            border-radius: var(--radius);
            box-shadow: 0 24px 60px rgba(0,0,0,0.35);
            border: 1px solid rgba(255,255,255,0.1);
        }

        /* ===== 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-title { text-align: center; margin-bottom: 3rem; }
        #yk-portal-v2 .yk-legacy-tool .section-title h2 {
            font-size: 2rem; font-weight: 800;
            color: var(--text-dark); margin-bottom: 0.6rem;
        }
        #yk-portal-v2 .yk-legacy-tool .section-title h2:after { display: none; }
        #yk-portal-v2 .yk-legacy-tool .section-title .underline {
            width: 56px; height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 2px; margin: 0 auto;
        }
        #yk-portal-v2 .yk-legacy-tool .section-title p {
            color: var(--text-muted); margin-top: 0.9rem;
            font-size: 1rem; max-width: 720px; 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;
        }
        #yk-portal-v2 .yk-legacy-tool .pain-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
        #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.coral { background: linear-gradient(135deg, #f97316, #ef4444); }
        #yk-portal-v2 .yk-legacy-tool .pain-icon.amber { background: linear-gradient(135deg, #f59e0b, #eab308); }
        #yk-portal-v2 .yk-legacy-tool .pain-icon.teal { background: linear-gradient(135deg, var(--primary), var(--accent-2)); }
        #yk-portal-v2 .yk-legacy-tool .pain-card h5 { font-weight: 700; color: var(--text-dark); margin-bottom: 0.6rem; }
        #yk-portal-v2 .yk-legacy-tool .pain-card p { color: var(--text-muted); font-size: 0.95rem; 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 0.3s, box-shadow 0.3s;
        }
        #yk-portal-v2 .yk-legacy-tool .feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(8,145,178,0.25); }
        #yk-portal-v2 .yk-legacy-tool .feature-card .icon-wrap {
            width: 54px; height: 54px;
            border-radius: 12px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.35rem; color: #fff;
            margin-bottom: 1rem;
        }
        #yk-portal-v2 .yk-legacy-tool .feature-card h5 { font-weight: 700; color: var(--text-dark); font-size: 1.08rem; margin-bottom: 0.5rem; }
        #yk-portal-v2 .yk-legacy-tool .feature-card p { color: var(--text-muted); font-size: 0.92rem; margin: 0 0 0.6rem; line-height: 1.7; }
        #yk-portal-v2 .yk-legacy-tool .feature-card .benefit {
            display: inline-block;
            font-size: 0.85rem; color: var(--primary-dark); font-weight: 700;
            background: var(--bg-light); padding: 6px 12px; border-radius: 8px;
            border: 1px solid rgba(8,145,178,0.15);
        }
        #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-2), #06b6d4); }
        #yk-portal-v2 .yk-legacy-tool .grad-3 { background: linear-gradient(135deg, var(--accent), #f97316); }
        #yk-portal-v2 .yk-legacy-tool .grad-4 { background: linear-gradient(135deg, #ec4899, #f43f5e); }
        #yk-portal-v2 .yk-legacy-tool .grad-5 { background: linear-gradient(135deg, #3b82f6, #06b6d4); }
        #yk-portal-v2 .yk-legacy-tool .grad-6 { background: linear-gradient(135deg, #14b8a6, #10b981); }

        /* ===== 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(-5px); 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: 1.55rem; color: #fff;
        }
        #yk-portal-v2 .yk-legacy-tool .scenario-card h5 { font-weight: 700; color: var(--text-dark); margin-bottom: 0.5rem; }
        #yk-portal-v2 .yk-legacy-tool .scenario-card p { color: var(--text-muted); font-size: 0.93rem; margin: 0; }

        /* ===== Steps ===== */
        #yk-portal-v2 .yk-legacy-tool .step-item {
            display: flex; align-items: flex-start;
            margin-bottom: 1.4rem;
            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;
        }
        #yk-portal-v2 .yk-legacy-tool .step-item:hover { transform: translateX(6px); 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: 1.05rem;
            flex-shrink: 0;
            margin-right: 1.3rem;
            box-shadow: 0 6px 14px rgba(8,145,178,0.28);
        }
        #yk-portal-v2 .yk-legacy-tool .step-content h6 { font-weight: 700; color: var(--text-dark); margin-bottom: 0.4rem; font-size: 1.05rem; }
        #yk-portal-v2 .yk-legacy-tool .step-content p { color: var(--text-body); font-size: 0.95rem; margin: 0; line-height: 1.75; }
        #yk-portal-v2 .yk-legacy-tool .step-content .tip {
            display: inline-block; margin-top: 0.5rem;
            background: var(--bg-light); color: var(--primary-dark);
            padding: 4px 10px; border-radius: 6px;
            font-size: 0.85rem; font-weight: 600;
        }

        /* ===== 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;
        }
        #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;
        }
        #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); }
        #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 0.35s ease, padding 0.35s ease;
            padding: 0 1.5rem;
            color: var(--text-body);
            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, #083344 0%, #0e7490 50%, #0891b2 100%);
            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(245,158,11,0.15) 0%, transparent 45%),
                        radial-gradient(circle at 70% 70%, rgba(255,255,255,0.06) 0%, transparent 45%);
        }
        #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: 0.8rem; }
        #yk-portal-v2 .yk-legacy-tool .download-section p.lead { opacity: 0.95; margin-bottom: 2rem; font-size: 1.05rem; }

        #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: 14px 36px; border-radius: 999px;
            text-decoration: none;
            transition: all 0.3s;
            box-shadow: 0 8px 24px 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.secondary {
            background: rgba(255,255,255,0.12);
            color: #fff; font-size: 0.95rem;
            padding: 11px 28px;
            border: 2px solid rgba(255,255,255,0.4);
            box-shadow: none;
        }
        #yk-portal-v2 .yk-legacy-tool .btn-download.secondary:hover {
            background: rgba(255,255,255,0.2); color: #fff;
        }
        #yk-portal-v2 .yk-legacy-tool .btn-row { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
        #yk-portal-v2 .yk-legacy-tool .download-note { margin-top: 1.2rem; font-size: 0.92rem; opacity: 0.9; }
        #yk-portal-v2 .yk-legacy-tool .download-note i { margin-right: 6px; }

        /* ===== Notice ===== */
        #yk-portal-v2 .yk-legacy-tool .notice-bar {
            background: linear-gradient(90deg, rgba(8,145,178,0.06), rgba(245,158,11,0.06));
            border-left: 4px solid var(--primary);
            padding: 16px 20px; border-radius: 8px;
            color: var(--text-body); font-size: 0.95rem;
            margin-top: 2rem;
        }
        #yk-portal-v2 .yk-legacy-tool .notice-bar strong { color: var(--primary-dark); }

        /* ===== Responsive ===== */
        @media (max-width: 768px) {
            #yk-portal-v2 .yk-legacy-tool .hero { padding: 5rem 0 3rem; }
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 1.8rem; }
            #yk-portal-v2 .yk-legacy-tool .hero .subtitle { font-size: 0.98rem; }
            #yk-portal-v2 .yk-legacy-tool .section { padding: 3rem 0; }
            #yk-portal-v2 .yk-legacy-tool .section-title h2 { font-size: 1.55rem; }
            #yk-portal-v2 .yk-legacy-tool .step-item { padding: 1.1rem; }
            #yk-portal-v2 .yk-legacy-tool .step-num { width: 38px; height: 38px; margin-right: 1rem; }
        }
        @media (max-width: 576px) {
            #yk-portal-v2 .yk-legacy-tool .hero h1 { font-size: 1.5rem; }
            #yk-portal-v2 .yk-legacy-tool .download-section h2 { font-size: 1.5rem; }
        }