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

        #yk-portal-v2 .yk-legacy-tool {
            --primary: #0f766e;
            --primary-light: #14b8a6;
            --primary-dark: #115e59;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --warm: #ef4444;
            --bg-light: #ecfdf5;
            --bg-section: #f8fafc;
            --bg-soft: #f0fdfa;
            --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(15, 118, 110, 0.10);
            --shadow-lg: 0 14px 38px rgba(15, 118, 110, 0.18);
            --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, #115e59 0%, #0f766e 45%, #14b8a6 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(245,158,11,0.20) 0%, transparent 45%);
            pointer-events: none;
        }
        #yk-portal-v2 .yk-legacy-tool .hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background-image: radial-gradient(rgba(255,255,255,0.05) 1px, transparent 1px);
            background-size: 24px 24px;
            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: 780px; 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; }

        /* ===== Wave animation ===== */
        #yk-portal-v2 .yk-legacy-tool .wave-bars { display: flex; justify-content: center; align-items: flex-end; gap: 4px; height: 36px; margin: 1.4rem auto 0; max-width: 240px; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span { width: 4px; background: linear-gradient(to top, #fbbf24, #fff); border-radius: 2px; animation: yk2f912475858438aa-waveAnim 1.2s ease-in-out infinite; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(1) { height: 30%; animation-delay: 0s; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(2) { height: 60%; animation-delay: 0.1s; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(3) { height: 90%; animation-delay: 0.2s; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(4) { height: 50%; animation-delay: 0.3s; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(5) { height: 80%; animation-delay: 0.4s; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(6) { height: 40%; animation-delay: 0.5s; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(7) { height: 70%; animation-delay: 0.6s; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(8) { height: 95%; animation-delay: 0.7s; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(9) { height: 55%; animation-delay: 0.8s; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(10) { height: 75%; animation-delay: 0.9s; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(11) { height: 35%; animation-delay: 1.0s; }
        #yk-portal-v2 .yk-legacy-tool .wave-bars span:nth-child(12) { height: 65%; animation-delay: 1.1s; }
        @keyframes yk2f912475858438aa-waveAnim { 0%, 100% { transform: scaleY(0.6); opacity: 0.7; } 50% { transform: scaleY(1); opacity: 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-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: 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, 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.teal { background: linear-gradient(135deg, var(--primary), var(--primary-light)); }
        #yk-portal-v2 .yk-legacy-tool .pain-icon.green { background: linear-gradient(135deg, #14b8a6, #10b981); }
        #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(15,118,110,0.18); }
        #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, #14b8a6, #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, #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); }
        #yk-portal-v2 .yk-legacy-tool .grad-7 { background: linear-gradient(135deg, #115e59, #0f766e); }
        #yk-portal-v2 .yk-legacy-tool .grad-8 { background: linear-gradient(135deg, #f59e0b, #ef4444); }

        /* ===== Mode Cards ===== */
        #yk-portal-v2 .yk-legacy-tool .mode-card { background: #fff; border-radius: var(--radius); padding: 2rem 1.7rem; box-shadow: var(--shadow-sm); border: 1px solid var(--border-color); height: 100%; transition: transform 0.3s, box-shadow 0.3s; position: relative; }
        #yk-portal-v2 .yk-legacy-tool .mode-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
        #yk-portal-v2 .yk-legacy-tool .mode-card .mode-tag { display: inline-block; font-size: 0.78rem; font-weight: 600; padding: 4px 12px; border-radius: 14px; margin-bottom: 0.9rem; }
        #yk-portal-v2 .yk-legacy-tool .mode-tag.tag-music { background: #ccfbf1; color: var(--primary-dark); }
        #yk-portal-v2 .yk-legacy-tool .mode-tag.tag-voice { background: #fef3c7; color: #b45309; }
        #yk-portal-v2 .yk-legacy-tool .mode-tag.tag-pro { background: #dbeafe; color: #1e40af; }
        #yk-portal-v2 .yk-legacy-tool .mode-card h5 { font-weight: 700; color: var(--text-dark); margin-bottom: 0.55rem; font-size: 1.1rem; }
        #yk-portal-v2 .yk-legacy-tool .mode-card p { color: var(--text-muted); font-size: 0.93rem; margin: 0 0 0.8rem; line-height: 1.7; }
        #yk-portal-v2 .yk-legacy-tool .mode-card .mode-list { list-style: none; padding: 0; margin: 0; }
        #yk-portal-v2 .yk-legacy-tool .mode-card .mode-list li { font-size: 0.88rem; color: var(--text-body); padding: 4px 0; display: flex; align-items: flex-start; gap: 8px; }
        #yk-portal-v2 .yk-legacy-tool .mode-card .mode-list li i { color: var(--primary); margin-top: 4px; flex-shrink: 0; font-size: 0.7rem; }

        /* ===== 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; }
        #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(15,118,110,0.25); }
        #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; gap: 14px; }
        #yk-portal-v2 .yk-legacy-tool .faq-question:hover { background: var(--bg-light); }
        #yk-portal-v2 .yk-legacy-tool .faq-question > span { flex: 1; }
        #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, #115e59, #0f766e 50%, #14b8a6); 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(245,158,11,0.18) 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; }

        /* ===== Format Cards ===== */
        #yk-portal-v2 .yk-legacy-tool .format-card { background: #fff; border-radius: var(--radius); padding: 1.8rem 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 .format-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
        #yk-portal-v2 .yk-legacy-tool .format-badge { display: inline-flex; align-items: center; justify-content: center; width: 80px; height: 80px; border-radius: 20px; font-size: 1.3rem; font-weight: 800; color: #fff; margin-bottom: 1rem; letter-spacing: 1px; }
        #yk-portal-v2 .yk-legacy-tool .format-badge.wav { background: linear-gradient(135deg, var(--primary), var(--primary-light)); }
        #yk-portal-v2 .yk-legacy-tool .format-badge.flac { background: linear-gradient(135deg, #14b8a6, #06b6d4); }
        #yk-portal-v2 .yk-legacy-tool .format-badge.mp3 { background: linear-gradient(135deg, #f59e0b, #f97316); }
        #yk-portal-v2 .yk-legacy-tool .format-card h5 { font-weight: 700; color: var(--text-dark); margin-bottom: 0.45rem; }
        #yk-portal-v2 .yk-legacy-tool .format-card p { color: var(--text-muted); font-size: 0.9rem; margin: 0; }

        /* ===== 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; } }