:root {
            --ysa473-primary: #ff7139;
            --ysa473-secondary: #0060df;
            --ysa473-bg-dark: #0b082d;
            --ysa473-bg-card: rgba(255, 255, 255, 0.05);
            --ysa473-text-main: #f9f9fa;
            --ysa473-text-muted: #bfbfc3;
            --ysa473-accent: #9059ff;
            --ysa473-glass: rgba(16, 12, 42, 0.8);
            --ysa473-spacing: 8px;
        }

        * {
            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-dark);
            color: var(--ysa473-text-main);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        .ysa473-container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 导航菜单 */
        .ysa473-nav-wrapper {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: var(--ysa473-glass);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .ysa473-nav-container {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 16px 24px;
            max-width: 1400px;
            margin: 0 auto;
        }

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

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

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

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

        .ysa473-menu a {
            text-decoration: none;
            color: var(--ysa473-text-muted);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.3s ease;
            white-space: nowrap;
        }

        .ysa473-menu a:hover {
            color: var(--ysa473-text-main);
            background: rgba(255, 255, 255, 0.1);
        }

        .ysa473-menu a.ysa473-active {
            color: var(--ysa473-text-main);
            background: var(--ysa473-secondary);
        }

        /* Hero 区块 - 独特居中遮罩布局 */
        .ysa473-hero {
            padding: 180px 0 100px;
            text-align: center;
            position: relative;
            background: radial-gradient(circle at center, rgba(144, 89, 255, 0.15) 0%, transparent 70%);
        }

        .ysa473-hero-content {
            max-width: 900px;
            margin: 0 auto;
            word-break: break-word;
        }

        .ysa473-hero-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(144, 89, 255, 0.2);
            border: 1px solid var(--ysa473-accent);
            border-radius: 20px;
            color: var(--ysa473-accent);
            font-size: 14px;
            margin-bottom: 24px;
            font-weight: bold;
        }

        .ysa473-hero h1 {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            margin-bottom: 24px;
            background: linear-gradient(135deg, #fff 0%, #bfbfc3 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            font-weight: 800;
        }

        .ysa473-hero p {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--ysa473-text-muted);
            max-width: 700px;
            margin: 0 auto 40px;
            line-height: 1.6;
        }

        .ysa473-btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }

        .ysa473-btn {
            padding: 16px 32px;
            border-radius: 8px;
            font-weight: 600;
            text-decoration: none;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
            min-width: 180px;
            display: inline-block;
        }

        .ysa473-btn-primary {
            background: linear-gradient(90deg, #ff9400, #ff2a00);
            color: white;
            box-shadow: 0 4px 15px rgba(255, 113, 57, 0.3);
        }

        .ysa473-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 113, 57, 0.4);
        }

        /* 核心功能 - Grid 布局 */
        .ysa473-features {
            padding: 80px 0;
        }

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

        .ysa473-card {
            background: var(--ysa473-bg-card);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 40px;
            border-radius: 16px;
            transition: all 0.3s ease;
            min-width: 0;
            word-break: break-word;
        }

        .ysa473-card:hover {
            border-color: var(--ysa473-accent);
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-8px);
        }

        .ysa473-card-icon {
            font-size: 40px;
            margin-bottom: 24px;
            display: block;
        }

        .ysa473-card h3 {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--ysa473-text-main);
        }

        .ysa473-card p {
            color: var(--ysa473-text-muted);
            font-size: 16px;
        }

        /* 视觉对比区块 */
        .ysa473-comparison {
            padding: 100px 0;
            background: rgba(0, 0, 0, 0.2);
        }

        .ysa473-split-layout {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

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

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

        .ysa473-privacy-box {
            background: linear-gradient(135deg, #1e1e3f 0%, #0b082d 100%);
            border: 2px solid var(--ysa473-secondary);
            border-radius: 20px;
            padding: 32px;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
        }

        .ysa473-privacy-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 12px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .ysa473-status-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: #00ff88;
            box-shadow: 0 0 10px #00ff88;
        }

        /* 底部动态区块标记 */
        .ysa473-section-title {
            text-align: center;
            margin-bottom: 48px;
        }

        .ysa473-section-title h2 {
            font-size: clamp(2rem, 3vw + 0.5rem, 3rem);
            margin-bottom: 16px;
        }

        /* 页脚 */
        .ysa473-footer {
            padding: 80px 0 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            margin-top: 80px;
        }

        .ysa473-footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
        }

        .ysa473-footer-brand {
            flex: 1 1 300px;
            min-width: 0;
        }

        .ysa473-footer-brand h4 {
            font-size: 20px;
            margin-bottom: 16px;
            color: var(--ysa473-text-main);
        }

        .ysa473-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
        }

        .ysa473-footer-group h5 {
            margin-bottom: 20px;
            color: #fff;
            text-transform: uppercase;
            letter-spacing: 1px;
            font-size: 14px;
        }

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

        .ysa473-footer-group li {
            margin-bottom: 10px;
        }

        .ysa473-footer-group a {
            color: var(--ysa473-text-muted);
            text-decoration: none;
            font-size: 14px;
            transition: color 0.2s;
        }

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

        .ysa473-copyright {
            margin-top: 60px;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            text-align: center;
            color: var(--ysa473-text-muted);
            font-size: 13px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .ysa473-nav-container {
                flex-direction: column;
                gap: 16px;
            }
            .ysa473-menu {
                justify-content: center;
                gap: 8px;
            }
            .ysa473-menu a {
                font-size: 12px;
                padding: 6px 8px;
            }
            .ysa473-hero {
                padding: 140px 0 60px;
            }
            .ysa473-grid {
                grid-template-columns: 1fr;
            }
            .ysa473-split-layout {
                flex-direction: column;
                text-align: center;
            }
        }