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

    #yk-portal-v2 .yk-legacy-tool {
        --primary-color: #007bff;
        --secondary-color: #6c757d;
        --background-color: #f8f9fa;
        --card-bg: #ffffff;
        --text-color: #343a40;
        --heading-color: #212529;
        --gradient-start: #6a11cb;
        --gradient-end: #2575fc;
    }

    #yk-portal-v2 .yk-legacy-tool {
        background-color: var(--background-color);
        color: var(--text-color);
        padding-top: 70px; /* 为固定的导航栏预留空间 */
    }

    #yk-portal-v2 .yk-legacy-tool .banner {
        background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
        color: white;
        padding: 80px 20px;
        text-align: center;
        border-bottom: 5px solid var(--primary-color);
    }

    #yk-portal-v2 .yk-legacy-tool .banner h1 {
        font-size: 3.5rem;
        font-weight: 700;
        margin-bottom: 20px;
        text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    }

    #yk-portal-v2 .yk-legacy-tool .banner p {
        font-size: 1.5rem;
        max-width: 800px;
        margin: 0 auto;
        opacity: 0.9;
    }

    #yk-portal-v2 .yk-legacy-tool .section {
        padding: 60px 20px;
    }

    #yk-portal-v2 .yk-legacy-tool .section-title {
        text-align: center;
        font-size: 2.5rem;
        font-weight: 600;
        margin-bottom: 50px;
        color: var(--heading-color);
        position: relative;
    }

    #yk-portal-v2 .yk-legacy-tool .section-title::after {
        content: '';
        width: 80px;
        height: 4px;
        background: var(--primary-color);
        position: absolute;
        bottom: -10px;
        left: 50%;
        transform: translateX(-50%);
        border-radius: 2px;
    }

    #yk-portal-v2 .yk-legacy-tool .pain-points-card {
        background: var(--card-bg);
        border-radius: 10px;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
        padding: 30px;
        text-align: center;
        border-left: 5px solid var(--primary-color);
        margin-bottom: 30px;
    }

    #yk-portal-v2 .yk-legacy-tool .pain-points-card p {
        font-size: 1.2rem;
        line-height: 1.8;
    }

    #yk-portal-v2 .yk-legacy-tool .feature-card {
        background: var(--card-bg);
        border-radius: 10px;
        padding: 30px;
        text-align: center;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
        transition: transform 0.3s, box-shadow 0.3s;
    }

    #yk-portal-v2 .yk-legacy-tool .feature-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
    }

    #yk-portal-v2 .yk-legacy-tool .feature-icon {
        font-size: 3rem;
        color: var(--primary-color);
        margin-bottom: 20px;
    }

    #yk-portal-v2 .yk-legacy-tool .feature-card h3 {
        font-size: 1.5rem;
        font-weight: 600;
        color: var(--heading-color);
        margin-bottom: 15px;
    }

    #yk-portal-v2 .yk-legacy-tool .feature-card p {
        font-size: 1rem;
        line-height: 1.6;
    }
    
    #yk-portal-v2 .yk-legacy-tool .bg-light-gray {
        background-color: #f1f3f6;
    }

    #yk-portal-v2 .yk-legacy-tool .scenario-card {
        padding: 20px;
        background: var(--card-bg);
        border-radius: 8px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    }
    #yk-portal-v2 .yk-legacy-tool .scenario-card h4 {
        color: var(--primary-color);
    }

    #yk-portal-v2 .yk-legacy-tool .faq-item {
        background: var(--card-bg);
        margin-bottom: 15px;
        border-radius: 8px;
        box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    }

    #yk-portal-v2 .yk-legacy-tool .faq-question {
        padding: 20px;
        width: 100%;
        text-align: left;
        background: none;
        border: none;
        font-size: 1.2rem;
        font-weight: 600;
        cursor: pointer;
        position: relative;
    }
    #yk-portal-v2 .yk-legacy-tool .faq-question::after {
        content: '+';
        position: absolute;
        right: 20px;
        font-size: 1.5rem;
        transition: transform 0.3s;
    }

    #yk-portal-v2 .yk-legacy-tool .faq-answer {
        padding: 0 20px 20px;
        display: none;
        line-height: 1.7;
    }

    #yk-portal-v2 .yk-legacy-tool .faq-item.active .faq-question::after {
        transform: rotate(45deg);
    }
    #yk-portal-v2 .yk-legacy-tool .faq-item.active .faq-answer {
        display: block;
    }

    #yk-portal-v2 .yk-legacy-tool .download-section {
        background: var(--card-bg);
        padding: 50px 20px;
        text-align: center;
        border-radius: 10px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    }

    #yk-portal-v2 .yk-legacy-tool .download-btn {
        background: var(--primary-color);
        color: white;
        padding: 15px 40px;
        font-size: 1.5rem;
        font-weight: bold;
        text-decoration: none;
        border-radius: 50px;
        transition: background-color 0.3s, transform 0.3s;
        display: inline-block;
    }

    #yk-portal-v2 .yk-legacy-tool .download-btn:hover {
        background-color: var(--gradient-end);
        transform: scale(1.05);
        color: white;
    }

    #yk-portal-v2 .yk-legacy-tool .os-support {
        margin-top: 20px;
        font-weight: 500;
        color: var(--secondary-color);
    }