:root {
            --ysa473-primary: #FF7139;
            --ysa473-secondary: #0060DF;
            --ysa473-accent: #8000D7;
            --ysa473-bg: #ffffff;
            --ysa473-text: #0C0C0D;
            --ysa473-text-muted: #5B5B66;
            --ysa473-dark-bg: #0C0C0D;
            --ysa473-glass: rgba(255, 255, 255, 0.8);
            --ysa473-container-width: 1100px;
        }

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

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

        .ysa473-container {
            max-width: var(--ysa473-container-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* 导航栏 */
        .ysa473-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: var(--ysa473-glass);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .ysa473-nav-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
            flex-wrap: wrap;
        }

        .ysa473-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .ysa473-logo img {
            height: 40px;
            display: block;
        }

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

        .ysa473-nav-menu li a {
            text-decoration: none;
            color: var(--ysa473-text);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.2s ease;
        }

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

        .ysa473-nav-menu li a.ysa473-active {
            color: var(--ysa473-primary);
            background: rgba(255, 113, 57, 0.1);
        }

        /* Hero 区块 */
        .ysa473-hero {
            padding: 160px 0 96px;
            background: radial-gradient(circle at top right, rgba(255, 113, 57, 0.08), transparent),
                        radial-gradient(circle at bottom left, rgba(0, 96, 223, 0.05), transparent);
            text-align: center;
            word-break: break-word;
        }

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

        .ysa473-hero h1 {
            font-size: clamp(2rem, 5vw + 1rem, 4rem);
            line-height: 1.1;
            margin-bottom: 24px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--ysa473-text) 0%, var(--ysa473-secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .ysa473-hero p {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--ysa473-text-muted);
            margin-bottom: 40px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .ysa473-search-sim {
            background: white;
            padding: 16px 24px;
            border-radius: 50px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            display: flex;
            align-items: center;
            max-width: 650px;
            margin: 0 auto;
            border: 1px solid rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
        }

        .ysa473-search-sim:hover {
            transform: translateY(-5px);
        }

        .ysa473-search-sim-icon {
            color: var(--ysa473-primary);
            margin-right: 16px;
            font-weight: bold;
        }

        .ysa473-search-sim-text {
            color: #999;
            flex-grow: 1;
            text-align: left;
            font-size: 1.1rem;
        }

        /* 设置卡片网格 */
        .ysa473-settings-grid {
            padding: 64px 0;
        }

        .ysa473-grid-layout {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            min-width: 0;
        }

        .ysa473-card {
            background: #fff;
            padding: 40px;
            border-radius: 24px;
            border: 1px solid rgba(0,0,0,0.03);
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: flex;
            flex-direction: column;
            min-width: 0;
            word-break: break-word;
        }

        .ysa473-card:hover {
            box-shadow: 0 24px 48px rgba(0,0,0,0.06);
            transform: translateY(-8px);
            border-color: var(--ysa473-secondary);
        }

        .ysa473-card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(0, 96, 223, 0.08);
            color: var(--ysa473-secondary);
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 20px;
            width: fit-content;
        }

        .ysa473-card h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--ysa473-text);
        }

        .ysa473-card p {
            color: var(--ysa473-text-muted);
            margin-bottom: 24px;
            flex-grow: 1;
        }

        .ysa473-btn-link {
            color: var(--ysa473-secondary);
            text-decoration: none;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: gap 0.2s;
        }

        .ysa473-btn-link:hover {
            gap: 12px;
        }

        /* 隐私保护区块 - 独特布局 */
        .ysa473-split-section {
            padding: 96px 0;
            background: var(--ysa473-dark-bg);
            color: white;
            border-radius: 48px;
            margin: 48px 24px;
            overflow: hidden;
        }

        .ysa473-split-container {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            min-width: 0;
        }

        .ysa473-split-text {
            flex: 1 1 450px;
            min-width: 0;
        }

        .ysa473-split-text h2 {
            font-size: clamp(1.8rem, 3vw + 1rem, 2.8rem);
            margin-bottom: 24px;
            line-height: 1.2;
        }

        .ysa473-split-text p {
            color: #A0A0A6;
            font-size: 1.1rem;
            margin-bottom: 32px;
        }

        .ysa473-feature-list {
            list-style: none;
        }

        .ysa473-feature-item {
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .ysa473-dot {
            width: 8px;
            height: 8px;
            background: var(--ysa473-primary);
            border-radius: 50%;
        }

        .ysa473-split-visual {
            flex: 1 1 450px;
            min-width: 0;
            position: relative;
        }

        .ysa473-visual-box {
            background: linear-gradient(45deg, #1A1A1B, #2B2A33);
            aspect-ratio: 16 / 10;
            border-radius: 24px;
            border: 1px solid rgba(255,255,255,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .ysa473-visual-box::after {
            content: "";
            position: absolute;
            width: 150%;
            height: 150%;
            background: conic-gradient(from 180deg at 50% 50%, var(--ysa473-primary) 0deg, transparent 60deg, var(--ysa473-secondary) 180deg, transparent 240deg);
            opacity: 0.1;
            animation: rotate 20s linear infinite;
        }

        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        /* 动态内容区块 */
        .ysa473-section-news {
            padding: 96px 0;
        }

        .ysa473-news-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            margin-bottom: 48px;
            flex-wrap: wrap;
            gap: 24px;
        }

        .ysa473-news-header h2 {
            font-size: 2.2rem;
            font-weight: 700;
        }

        /* 页脚 */
        .ysa473-footer {
            background: #F9F9FB;
            padding: 80px 0 40px;
            border-top: 1px solid #EDEDF0;
        }

        .ysa473-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
            min-width: 0;
        }

        .ysa473-footer-brand h4 {
            font-size: 1.2rem;
            margin-bottom: 16px;
            color: var(--ysa473-text);
        }

        .ysa473-footer-brand p {
            color: var(--ysa473-text-muted);
            font-size: 0.9rem;
        }

        .ysa473-footer-links h5 {
            margin-bottom: 24px;
            font-size: 1rem;
            color: var(--ysa473-text);
        }

        .ysa473-footer-links ul {
            list-style: none;
        }

        .ysa473-footer-links ul li {
            margin-bottom: 12px;
        }

        .ysa473-footer-links ul li a {
            text-decoration: none;
            color: var(--ysa473-text-muted);
            font-size: 0.9rem;
            transition: color 0.2s;
        }

        .ysa473-footer-links ul li a:hover {
            color: var(--ysa473-secondary);
        }

        .ysa473-footer-bottom {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid #EDEDF0;
            color: #999;
            font-size: 0.85rem;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .ysa473-nav-wrapper {
                height: auto;
                padding: 16px 0;
            }
            .ysa473-nav-menu {
                display: none; /* 简化演示，实际应有汉堡菜单 */
            }
            .ysa473-split-section {
                margin: 24px 0;
                border-radius: 0;
            }
            .ysa473-hero {
                padding: 120px 0 64px;
            }
        }