:root {
            --ysa473-primary: #0060DF;
            --ysa473-accent: #FF7139;
            --ysa473-gradient: linear-gradient(90deg, #FF7139 0%, #FF0061 50%, #9059FF 100%);
            --ysa473-bg-light: #F9F9FB;
            --ysa473-text-main: #20123A;
            --ysa473-text-muted: #5B5B66;
            --ysa473-white: #FFFFFF;
            --ysa473-container-width: 1100px;
            --ysa473-radius: 16px;
            --ysa473-shadow: 0 10px 30px rgba(0,0,0,0.08);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--ysa473-bg-light);
            color: var(--ysa473-text-main);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        .ysa473-container {
            max-width: var(--ysa473-container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Navigation */
        .ysa473-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            height: 72px;
            display: flex;
            align-items: center;
        }

        .ysa473-nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            flex-wrap: wrap;
        }

        .ysa473-logo {
            flex: 0 0 auto;
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .ysa473-logo img {
            height: 40px;
            width: auto;
        }

        .ysa473-nav-menu {
            display: flex;
            list-style: none;
            gap: 16px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .ysa473-nav-menu li {
            min-width: 0;
        }

        .ysa473-nav-menu a {
            text-decoration: none;
            color: var(--ysa473-text-main);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.3s ease;
            white-space: nowrap;
        }

        .ysa473-nav-menu a:hover {
            background: rgba(0, 96, 223, 0.05);
            color: var(--ysa473-primary);
        }

        .ysa473-nav-menu a.ysa473-active {
            color: var(--ysa473-primary);
            background: rgba(0, 96, 223, 0.1);
        }

        /* Hero Section */
        .ysa473-hero {
            padding: 160px 0 96px;
            background: radial-gradient(circle at top right, rgba(255, 113, 57, 0.1), transparent),
                        radial-gradient(circle at bottom left, rgba(144, 89, 255, 0.1), transparent);
            text-align: center;
        }

        .ysa473-hero-content {
            max-width: 800px;
            margin: 0 auto;
            word-break: break-word;
        }

        .ysa473-hero h1 {
            font-size: clamp(2.5rem, 5vw, 4rem);
            line-height: 1.1;
            margin-bottom: 24px;
            background: var(--ysa473-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            font-weight: 800;
        }

        .ysa473-hero p {
            font-size: clamp(1.1rem, 2vw, 1.4rem);
            color: var(--ysa473-text-muted);
            margin-bottom: 40px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .ysa473-sync-visual {
            margin-top: 64px;
            background: var(--ysa473-white);
            padding: 40px;
            border-radius: var(--ysa473-radius);
            box-shadow: var(--ysa473-shadow);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-around;
            align-items: center;
            gap: 32px;
        }

        .ysa473-device-icon {
            flex: 1;
            min-width: 200px;
            padding: 24px;
            text-align: center;
        }

        .ysa473-device-icon span {
            display: block;
            font-size: 3rem;
            margin-bottom: 16px;
        }

        /* Feature Section */
        .ysa473-section {
            padding: 96px 0;
            word-break: break-word;
        }

        .ysa473-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .ysa473-card {
            background: var(--ysa473-white);
            padding: 40px;
            border-radius: var(--ysa473-radius);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid rgba(0,0,0,0.03);
            min-width: 0;
        }

        .ysa473-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }

        .ysa473-card-title {
            font-size: 1.5rem;
            margin-bottom: 16px;
            font-weight: 700;
            color: var(--ysa473-text-main);
        }

        .ysa473-card-text {
            color: var(--ysa473-text-muted);
            line-height: 1.7;
        }

        /* Split Section */
        .ysa473-split {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            margin-bottom: 96px;
        }

        .ysa473-split > div {
            flex: 1;
            min-width: 300px;
        }

        .ysa473-badge {
            display: inline-block;
            background: rgba(0, 96, 223, 0.1);
            color: var(--ysa473-primary);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 700;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .ysa473-btn {
            display: inline-block;
            background: var(--ysa473-primary);
            color: var(--ysa473-white);
            padding: 16px 32px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            transition: filter 0.3s ease;
            border: none;
            cursor: pointer;
        }

        .ysa473-btn:hover {
            filter: brightness(1.1);
        }

        /* Footer */
        .ysa473-footer {
            background: #F0F0F4;
            padding: 64px 0;
            margin-top: 96px;
        }

        .ysa473-footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .ysa473-footer-brand {
            flex: 0 0 300px;
            min-width: 0;
        }

        .ysa473-footer-brand h2 {
            font-size: 1.5rem;
            margin-bottom: 16px;
        }

        .ysa473-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            flex: 1;
            min-width: 0;
        }

        .ysa473-link-group {
            min-width: 140px;
        }

        .ysa473-link-group h4 {
            margin-bottom: 20px;
            font-size: 1rem;
            color: var(--ysa473-text-main);
        }

        .ysa473-link-group ul {
            list-style: none;
        }

        .ysa473-link-group li {
            margin-bottom: 12px;
        }

        .ysa473-link-group a {
            text-decoration: none;
            color: var(--ysa473-text-muted);
            font-size: 0.9rem;
            transition: color 0.3s ease;
        }

        .ysa473-link-group a:hover {
            color: var(--ysa473-primary);
        }

        .ysa473-copyright {
            margin-top: 64px;
            padding-top: 24px;
            border-top: 1px solid rgba(0,0,0,0.1);
            text-align: center;
            font-size: 0.85rem;
            color: var(--ysa473-text-muted);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .ysa473-header {
                height: auto;
                padding: 16px 0;
            }
            .ysa473-nav-menu {
                margin-top: 16px;
                justify-content: center;
            }
            .ysa473-hero {
                padding-top: 140px;
            }
            .ysa473-split {
                flex-direction: column;
                text-align: center;
            }
            .ysa473-grid {
                grid-template-columns: 1fr;
            }
        }