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

        /* Hero Section */
        #yk-portal-v2 .yk-legacy-tool .hero-section {
            background: radial-gradient(1200px 600px at 10% 10%, rgba(59,130,246,0.25), transparent),
                        radial-gradient(1000px 500px at 90% 20%, rgba(30,58,138,0.35), transparent),
                        linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            position: relative;
            overflow: hidden;
            padding-top: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 64vh;
            color: #fff;
        }
        #yk-portal-v2 .yk-legacy-tool .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.07"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
            opacity: 0.25;
        }
        #yk-portal-v2 .yk-legacy-tool .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            width: 100%;
            padding: 48px 20px;
            margin: 0 auto;
        }
        /* Override global .hero-content alignment to ensure centering on this page */
        #yk-portal-v2 .yk-legacy-tool .hero-section .hero-content { display: flex; flex-direction: column; align-items: center !important; justify-content: center; }
        #yk-portal-v2 .yk-legacy-tool .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            letter-spacing: 1px;
            line-height: 1.15;
            margin-bottom: 1.2rem;
            text-shadow: 0 8px 30px rgba(0,0,0,0.35);
        }
        #yk-portal-v2 .yk-legacy-tool .hero-subtitle {
            font-size: 1.3rem;
            font-weight: 400;
            opacity: 0.95;
            max-width: 820px;
            margin: 0 auto 2rem auto;
            line-height: 1.7;
        }
        #yk-portal-v2 .yk-legacy-tool .hero-cta {
            display: inline-block;
            padding: 14px 28px;
            border-radius: 999px;
            background: #3b82f6;
            color: #fff;
            font-weight: 700;
            text-decoration: none;
            box-shadow: 0 10px 30px rgba(59,130,246,0.35);
            transition: all 0.3s ease;
            margin: 0 auto; /* ensure button is centered */
        }
        #yk-portal-v2 .yk-legacy-tool .hero-cta:hover { transform: translateY(-2px); box-shadow: 0 15px 40px rgba(59,130,246,0.5); color: #fff; text-decoration: none; }

        /* Sections */
        #yk-portal-v2 .yk-legacy-tool .content-section { padding: 84px 0; }
        #yk-portal-v2 .yk-legacy-tool .section-header { text-align: center; margin-bottom: 56px; }
        #yk-portal-v2 .yk-legacy-tool .section-title { font-size: 2.3rem; font-weight: 800; color: #1f2937; margin-bottom: 0.75rem; position: relative; }
        #yk-portal-v2 .yk-legacy-tool .section-title::after { content: ''; position: absolute; bottom: -10px; left: 50%; transform: translateX(-50%); width: 64px; height: 4px; background: linear-gradient(135deg, #2563eb, #1e40af); border-radius: 2px; }
        #yk-portal-v2 .yk-legacy-tool .section-description { font-size: 1.06rem; color: #6b7280; max-width: 760px; margin: 0 auto; line-height: 1.8; }

        /* Pain Points */
        #yk-portal-v2 .yk-legacy-tool .pain-points { background: #f8fafc; }
        #yk-portal-v2 .yk-legacy-tool .pain-card { background: #fff; padding: 36px 28px; border-radius: 16px; box-shadow: 0 8px 24px rgba(2,6,23,0.06); text-align: center; margin-bottom: 26px; border: 1px solid rgba(2,6,23,0.05); transition: transform 0.3s ease, box-shadow 0.3s ease; }
        #yk-portal-v2 .yk-legacy-tool .pain-card:hover { transform: translateY(-6px); box-shadow: 0 14px 34px rgba(2,6,23,0.12); }
        #yk-portal-v2 .yk-legacy-tool .pain-icon { font-size: 2.4rem; color: #ef4444; margin-bottom: 16px; }
        #yk-portal-v2 .yk-legacy-tool .pain-title { font-size: 1.2rem; font-weight: 700; color: #111827; margin-bottom: 10px; }
        #yk-portal-v2 .yk-legacy-tool .pain-text { color: #6b7280; line-height: 1.7; }

        /* Features */
        #yk-portal-v2 .yk-legacy-tool .feature-card { background: #fff; padding: 40px 30px; border-radius: 16px; border: 2px solid transparent; box-shadow: 0 6px 20px rgba(30,58,138,0.08); text-align: left; margin-bottom: 26px; transition: all 0.3s ease; }
        #yk-portal-v2 .yk-legacy-tool .feature-card:hover { transform: translateY(-5px); border-color: #2563eb; box-shadow: 0 16px 36px rgba(30,58,138,0.15); }
        #yk-portal-v2 .yk-legacy-tool .feature-icon { width: 72px; height: 72px; background: linear-gradient(135deg, #2563eb, #1e40af); border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-bottom: 18px; color: #fff; font-size: 1.8rem; }
        /* 提升特性图标对比度，避免蓝底蓝标 */
        #yk-portal-v2 .yk-legacy-tool .feature-card .feature-icon i { color: #ffffff !important; text-shadow: 0 2px 6px rgba(0,0,0,0.35); filter: drop-shadow(0 1px 2px rgba(0,0,0,0.25)); }
        #yk-portal-v2 .yk-legacy-tool .feature-title { font-size: 1.25rem; font-weight: 700; color: #111827; margin-bottom: 10px; }
        #yk-portal-v2 .yk-legacy-tool .feature-description { color: #6b7280; line-height: 1.7; margin-bottom: 10px; }
        #yk-portal-v2 .yk-legacy-tool .feature-benefit { color: #16a34a; font-weight: 700; font-style: italic; }

        /* Scenarios */
        #yk-portal-v2 .yk-legacy-tool .scenarios { background: #f8fafc; }
        #yk-portal-v2 .yk-legacy-tool .scenario-card { background: #fff; padding: 32px 24px; border-radius: 16px; border: 2px solid transparent; text-align: center; margin-bottom: 24px; box-shadow: 0 6px 20px rgba(30,58,138,0.08); transition: all 0.3s ease; }
        #yk-portal-v2 .yk-legacy-tool .scenario-card:hover { transform: translateY(-5px); border-color: #1e40af; box-shadow: 0 14px 34px rgba(30,58,138,0.15); }
        #yk-portal-v2 .yk-legacy-tool .scenario-icon { font-size: 2.2rem; margin-bottom: 14px; color: #1e40af; }
        #yk-portal-v2 .yk-legacy-tool .scenario-title { font-size: 1.15rem; font-weight: 700; color: #111827; margin-bottom: 8px; }
        #yk-portal-v2 .yk-legacy-tool .scenario-description { color: #6b7280; line-height: 1.7; }

        /* Steps */
        #yk-portal-v2 .yk-legacy-tool .step-card { background: #fff; padding: 30px; border-radius: 16px; box-shadow: 0 6px 20px rgba(30,58,138,0.08); margin-bottom: 22px; position: relative; border: 2px solid transparent; transition: all 0.3s ease; }
        #yk-portal-v2 .yk-legacy-tool .step-card:hover { border-color: #1e40af; box-shadow: 0 12px 30px rgba(30,58,138,0.12); }
        #yk-portal-v2 .yk-legacy-tool .step-number { position: absolute; top: 18px; right: 18px; width: 40px; height: 40px; background: linear-gradient(135deg, #2563eb, #1e40af); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 800; }
        #yk-portal-v2 .yk-legacy-tool .step-title { font-size: 1.2rem; font-weight: 700; color: #111827; margin-bottom: 12px; padding-right: 56px; }
        #yk-portal-v2 .yk-legacy-tool .step-description { color: #6b7280; line-height: 1.7; }

        /* FAQ */
        #yk-portal-v2 .yk-legacy-tool .faq-section { background: #f8fafc; }
        #yk-portal-v2 .yk-legacy-tool .faq-item { background: #fff; margin-bottom: 12px; border-radius: 12px; overflow: hidden; box-shadow: 0 4px 16px rgba(2,6,23,0.06); border: 1px solid rgba(2,6,23,0.06); }
        #yk-portal-v2 .yk-legacy-tool .faq-question { padding: 22px 28px; background: #fff; border: none; width: 100%; text-align: left; font-size: 1.05rem; font-weight: 700; color: #111827; cursor: pointer; transition: background-color 0.3s ease; position: relative; }
        #yk-portal-v2 .yk-legacy-tool .faq-question:hover { background: #f9fafb; }
        #yk-portal-v2 .yk-legacy-tool .faq-question::after { content: '+'; position: absolute; right: 28px; top: 50%; transform: translateY(-50%); font-size: 1.4rem; transition: transform 0.3s ease; }
        #yk-portal-v2 .yk-legacy-tool .faq-question.active::after { transform: translateY(-50%) rotate(45deg); }
        #yk-portal-v2 .yk-legacy-tool .faq-answer { padding: 0 28px; max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; }
        #yk-portal-v2 .yk-legacy-tool .faq-answer.show { padding: 18px 28px 26px; max-height: 320px; }
        #yk-portal-v2 .yk-legacy-tool .faq-answer p { color: #6b7280; line-height: 1.8; margin: 0; }

        /* Download Section */
        #yk-portal-v2 .yk-legacy-tool .download-section { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); color: #fff; text-align: center; }
        #yk-portal-v2 .yk-legacy-tool .download-btn { display: inline-block; background: #ffffff; color: #0f172a; padding: 18px 44px; border-radius: 999px; text-decoration: none; font-size: 1.15rem; font-weight: 800; margin: 18px 10px; transition: all 0.3s ease; box-shadow: 0 12px 36px rgba(0,0,0,0.25); }
        #yk-portal-v2 .yk-legacy-tool .download-btn:hover { transform: translateY(-3px); box-shadow: 0 18px 46px rgba(0,0,0,0.35); color: #0f172a; text-decoration: none; }
        #yk-portal-v2 .yk-legacy-tool .system-requirements { margin-top: 22px; font-size: 1rem; opacity: 0.95; }

        /* Screenshot */
        #yk-portal-v2 .yk-legacy-tool .screenshot-wrap { background: #0b1220; border-radius: 16px; padding: 10px; box-shadow: 0 18px 44px rgba(2,6,23,0.35); }
        #yk-portal-v2 .yk-legacy-tool .screenshot-inner { border-radius: 12px; overflow: hidden; border: 1px solid rgba(255,255,255,0.08); }
        #yk-portal-v2 .yk-legacy-tool .screenshot-inner img { width: 100%; height: auto; display: block; }

        /* Responsive */
        @media (max-width: 992px) {
            #yk-portal-v2 .yk-legacy-tool .hero-title { font-size: 2.4rem; }
            #yk-portal-v2 .yk-legacy-tool .hero-subtitle { font-size: 1.15rem; }
            #yk-portal-v2 .yk-legacy-tool .content-section { padding: 68px 0; }
        }
        @media (max-width: 576px) {
            #yk-portal-v2 .yk-legacy-tool .hero-section { min-height: 54vh; padding-top: 64px; }
            #yk-portal-v2 .yk-legacy-tool .hero-title { font-size: 2rem; line-height: 1.25; }
            #yk-portal-v2 .yk-legacy-tool .hero-subtitle { font-size: 1rem; }
        }