:root {
            --iuiyl-primary: #D11111;
            --iuiyl-secondary: #2D3436;
            --iuiyl-accent: #FF4757;
            --iuiyl-bg-light: #F9F9FB;
            --iuiyl-text-dark: #1A1A1B;
            --iuiyl-text-muted: #636E72;
            --iuiyl-white: #FFFFFF;
            --iuiyl-glass: rgba(255, 255, 255, 0.85);
            --iuiyl-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
            --iuiyl-container-width: 1100px;
            --iuiyl-transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        }

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

        body {
            font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--iuiyl-bg-light);
            color: var(--iuiyl-text-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* 导航栏设计 */
        .iuiyl-header {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: var(--iuiyl-glass);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            transition: var(--iuiyl-transition);
        }

        .iuiyl-nav-container {
            max-width: var(--iuiyl-container-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 72px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

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

        .iuiyl-logo img {
            height: 32px;
            width: auto;
        }

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

        .iuiyl-nav-menu li a {
            text-decoration: none;
            color: var(--iuiyl-text-dark);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 6px;
            transition: var(--iuiyl-transition);
            word-break: keep-all;
        }

        .iuiyl-nav-menu li a:hover {
            color: var(--iuiyl-primary);
            background: rgba(209, 17, 17, 0.05);
        }

        .iuiyl-nav-menu li a.iuiyl-active {
            color: var(--iuiyl-primary);
            font-weight: 700;
            background: rgba(209, 17, 17, 0.08);
        }

        /* Hero 区块 - 独特的中轴对称排版 */
        .iuiyl-hero {
            padding: 160px 24px 96px;
            background: radial-gradient(circle at top right, rgba(209, 17, 17, 0.05), transparent),
                        radial-gradient(circle at bottom left, rgba(45, 52, 54, 0.03), transparent);
            text-align: center;
            position: relative;
        }

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

        .iuiyl-hero-tag {
            display: inline-block;
            padding: 6px 16px;
            background: var(--iuiyl-primary);
            color: white;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 24px;
            letter-spacing: 1px;
            text-transform: uppercase;
        }

        .iuiyl-hero h1 {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            line-height: 1.1;
            margin-bottom: 24px;
            font-weight: 800;
            word-break: keep-all;
            background: linear-gradient(135deg, #1a1a1b 0%, #d11111 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .iuiyl-hero p {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--iuiyl-text-muted);
            max-width: 600px;
            margin: 0 auto 40px;
            word-break: break-word;
        }

        .iuiyl-download-card {
            background: var(--iuiyl-white);
            padding: 40px;
            border-radius: 24px;
            box-shadow: var(--iuiyl-shadow);
            display: inline-flex;
            flex-direction: column;
            align-items: center;
            gap: 20px;
            border: 1px solid rgba(0, 0, 0, 0.03);
            min-width: 0;
            max-width: 100%;
        }

        .iuiyl-btn-main {
            background: var(--iuiyl-primary);
            color: white;
            padding: 18px 48px;
            border-radius: 12px;
            font-size: 18px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--iuiyl-transition);
            box-shadow: 0 10px 20px rgba(209, 17, 17, 0.2);
        }

        .iuiyl-btn-main:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(209, 17, 17, 0.3);
            filter: brightness(1.1);
        }

        /* 字体展示区 - 创意网格 */
        .iuiyl-font-showcase {
            max-width: var(--iuiyl-container-width);
            margin: 0 auto;
            padding: 64px 24px;
        }

        .iuiyl-section-title {
            margin-bottom: 48px;
            text-align: left;
            border-left: 6px solid var(--iuiyl-primary);
            padding-left: 24px;
        }

        .iuiyl-section-title h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .iuiyl-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 32px;
        }

        .iuiyl-font-card {
            background: var(--iuiyl-white);
            border-radius: 16px;
            padding: 32px;
            transition: var(--iuiyl-transition);
            border: 1px solid rgba(0,0,0,0.05);
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .iuiyl-font-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--iuiyl-shadow);
        }

        .iuiyl-font-preview {
            font-size: 48px;
            margin-bottom: 24px;
            color: var(--iuiyl-primary);
            line-height: 1;
            font-family: serif;
            word-break: break-all;
        }

        .iuiyl-font-info h3 {
            font-size: 20px;
            margin-bottom: 8px;
        }

        .iuiyl-font-info p {
            font-size: 14px;
            color: var(--iuiyl-text-muted);
            margin-bottom: 20px;
        }

        /* 用户体验旅程 */
        .iuiyl-journey {
            background: var(--iuiyl-secondary);
            color: var(--iuiyl-white);
            padding: 96px 24px;
            margin-top: 64px;
        }

        .iuiyl-journey-inner {
            max-width: var(--iuiyl-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
        }

        .iuiyl-journey-item {
            flex: 1;
            min-width: 280px;
            padding: 32px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 20px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .iuiyl-step-num {
            font-size: 40px;
            font-weight: 800;
            color: var(--iuiyl-primary);
            margin-bottom: 16px;
            display: block;
        }

        .iuiyl-journey-item h4 {
            font-size: 22px;
            margin-bottom: 12px;
        }

        .iuiyl-journey-item p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 15px;
        }

        /* 动态内容区块 */
        .iuiyl-news-section {
            max-width: var(--iuiyl-container-width);
            margin: 96px auto;
            padding: 0 24px;
        }

        .iuiyl-news-list {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-top: 32px;
        }

        .iuiyl-news-item {
            flex: 1;
            min-width: 300px;
            background: var(--iuiyl-white);
            padding: 24px;
            border-radius: 12px;
            text-decoration: none;
            color: inherit;
            border-bottom: 3px solid transparent;
            transition: var(--iuiyl-transition);
        }

        .iuiyl-news-item:hover {
            border-bottom-color: var(--iuiyl-primary);
            background: #fff;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
        }

        .iuiyl-news-item span {
            font-size: 12px;
            color: var(--iuiyl-primary);
            font-weight: 600;
            text-transform: uppercase;
        }

        .iuiyl-news-item h5 {
            font-size: 18px;
            margin: 8px 0;
            word-break: keep-all;
        }

        /* 页脚 */
        .iuiyl-footer {
            background: #111;
            color: #888;
            padding: 80px 24px 40px;
        }

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

        .iuiyl-footer-brand {
            flex: 1;
            min-width: 240px;
        }

        .iuiyl-footer-brand h2 {
            color: var(--iuiyl-white);
            font-size: 24px;
            margin-bottom: 16px;
        }

        .iuiyl-footer-links {
            display: flex;
            gap: 64px;
            flex-wrap: wrap;
        }

        .iuiyl-footer-col h6 {
            color: var(--iuiyl-white);
            font-size: 16px;
            margin-bottom: 24px;
        }

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

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

        .iuiyl-footer-col ul li a {
            color: #888;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s;
        }

        .iuiyl-footer-col ul li a:hover {
            color: var(--iuiyl-primary);
        }

        .iuiyl-copyright {
            max-width: var(--iuiyl-container-width);
            margin: 64px auto 0;
            padding-top: 32px;
            border-top: 1px solid #222;
            text-align: center;
            font-size: 13px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .iuiyl-nav-menu {
                display: none; /* 简化移动端，实际项目中应有汉堡菜单 */
            }
            .iuiyl-hero {
                padding-top: 120px;
            }
            .iuiyl-grid {
                grid-template-columns: 1fr;
            }
            .iuiyl-journey-inner {
                flex-direction: column;
            }
        }