:root {
            --ysa473-primary: #FF7139;
            --ysa473-primary-dark: #E22B26;
            --ysa473-secondary: #9059FF;
            --ysa473-dark: #002240;
            --ysa473-light: #F9F9FB;
            --ysa473-text: #20123A;
            --ysa473-gray: #5B5B66;
            --ysa473-max-width: 1400px;
            --ysa473-transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        }

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

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

        /* 导航系统 */
        .ysa473-header {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            transition: var(--ysa473-transition);
        }

        .ysa473-nav-container {
            max-width: var(--ysa473-max-width);
            margin: 0 auto;
            padding: 0 48px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: 80px;
        }

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

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

        .ysa473-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
            min-width: 0;
        }

        .ysa473-nav-item a {
            text-decoration: none;
            color: var(--ysa473-text);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--ysa473-transition);
            padding: 8px 4px;
            position: relative;
        }

        .ysa473-nav-item a:hover {
            color: var(--ysa473-primary);
        }

        .ysa473-nav-item.active a {
            color: var(--ysa473-primary);
        }

        .ysa473-nav-item.active a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--ysa473-primary);
        }

        /* Hero 区块 - 独特非对称布局 */
        .ysa473-hero {
            padding: 160px 48px 96px;
            background: radial-gradient(circle at top right, #fff5f2, transparent), 
                        radial-gradient(circle at bottom left, #f3f0ff, transparent);
            position: relative;
            overflow: hidden;
        }

        .ysa473-hero-inner {
            max-width: var(--ysa473-max-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .ysa473-hero-content {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

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

        .ysa473-hero-subtitle {
            font-size: clamp(1.1rem, 1vw + 0.5rem, 1.4rem);
            color: var(--ysa473-gray);
            margin-bottom: 40px;
            max-width: 600px;
            line-height: 1.8;
        }

        .ysa473-hero-visual {
            flex: 1.2;
            min-width: 320px;
            position: relative;
        }

        .ysa473-browser-mockup {
            background: white;
            border-radius: 24px;
            box-shadow: 0 40px 100px rgba(0,0,0,0.1);
            padding: 12px;
            border: 1px solid rgba(0,0,0,0.05);
            transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
            transition: var(--ysa473-transition);
        }

        .ysa473-browser-mockup:hover {
            transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
        }

        .ysa473-mockup-header {
            height: 40px;
            background: #eee;
            border-radius: 12px 12px 4px 4px;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            padding: 0 16px;
            gap: 8px;
        }

        .ysa473-dot { width: 10px; height: 10px; border-radius: 50%; background: #ccc; }

        .ysa473-mockup-body {
            height: 300px;
            background: linear-gradient(45deg, #FF7139, #9059FF);
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 1.5rem;
            text-align: center;
            padding: 24px;
        }

        /* 主题网格区块 */
        .ysa473-section {
            padding: 96px 48px;
            max-width: var(--ysa473-max-width);
            margin: 0 auto;
        }

        .ysa473-section-header {
            margin-bottom: 64px;
            text-align: center;
        }

        .ysa473-section-title {
            font-size: clamp(2rem, 3vw, 3rem);
            font-weight: 700;
            margin-bottom: 16px;
        }

        .ysa473-theme-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
            gap: 32px;
        }

        .ysa473-theme-card {
            background: white;
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid rgba(0,0,0,0.05);
            transition: var(--ysa473-transition);
            cursor: pointer;
            min-width: 0;
        }

        .ysa473-theme-card:hover {
            transform: translateY(-12px);
            box-shadow: 0 24px 48px rgba(0,0,0,0.08);
        }

        .ysa473-card-preview {
            height: 180px;
            position: relative;
            overflow: hidden;
        }

        .ysa473-card-content {
            padding: 24px;
            word-break: break-word;
        }

        .ysa473-card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: #f0f0f4;
            border-radius: 20px;
            font-size: 0.8rem;
            color: var(--ysa473-gray);
            margin-bottom: 12px;
        }

        .ysa473-card-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        /* 风格化按钮 */
        .ysa473-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 36px;
            border-radius: 50px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--ysa473-transition);
            cursor: pointer;
            border: none;
            font-size: 1.1rem;
        }

        .ysa473-btn-primary {
            background: var(--ysa473-primary);
            color: white;
            box-shadow: 0 10px 20px rgba(255, 113, 57, 0.3);
        }

        .ysa473-btn-primary:hover {
            background: var(--ysa473-primary-dark);
            transform: scale(1.05);
        }

        /* 动态内容区块标记 */
        .ysa473-articles-section {
            background: white;
            width: 100vw;
            margin-left: calc(-50vw + 50%);
            padding: 96px 48px;
        }

        /* 页脚 */
        .ysa473-footer {
            background: var(--ysa473-dark);
            color: white;
            padding: 80px 48px 40px;
        }

        .ysa473-footer-inner {
            max-width: var(--ysa473-max-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .ysa473-footer-brand {
            flex: 1.5;
            min-width: 280px;
        }

        .ysa473-footer-brand-name {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 24px;
            letter-spacing: -1px;
        }

        .ysa473-footer-links {
            flex: 2;
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            min-width: 0;
        }

        .ysa473-footer-col {
            flex: 1;
            min-width: 140px;
        }

        .ysa473-footer-col h4 {
            margin-bottom: 24px;
            font-size: 1.1rem;
        }

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

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

        .ysa473-footer-col a {
            color: rgba(255,255,255,0.6);
            text-decoration: none;
            transition: var(--ysa473-transition);
        }

        .ysa473-footer-col a:hover {
            color: white;
        }

        .ysa473-footer-bottom {
            max-width: var(--ysa473-max-width);
            margin: 64px auto 0;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            color: rgba(255,255,255,0.4);
            font-size: 0.9rem;
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .ysa473-nav-container { padding: 0 24px; }
            .ysa473-hero { padding: 120px 24px 64px; }
            .ysa473-hero-inner { gap: 40px; }
        }

        @media (max-width: 768px) {
            .ysa473-nav-menu {
                display: none; /* 简化演示，实际应有汉堡菜单 */
            }
            .ysa473-hero-inner {
                flex-direction: column;
                text-align: center;
            }
            .ysa473-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .ysa473-hero-visual {
                width: 100%;
            }
            .ysa473-theme-grid {
                grid-template-columns: 1fr;
            }
            .ysa473-footer-inner {
                flex-direction: column;
            }
        }