:root {
            --iuiyl-primary: #1e63ff;
            --iuiyl-secondary: #f5222d;
            --iuiyl-text: #1d1d1f;
            --iuiyl-text-light: #86868b;
            --iuiyl-bg: #ffffff;
            --iuiyl-bg-soft: #f5f5f7;
            --iuiyl-accent: rgba(30, 99, 255, 0.1);
            --iuiyl-radius: 16px;
            --iuiyl-gap: 8px;
            --iuiyl-container: 1100px;
        }

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

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

        /* 导航栏 */
        .iuiyl-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 64px;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            z-index: 1000;
            display: flex;
            align-items: center;
        }

        .iuiyl-nav-container {
            max-width: var(--iuiyl-container);
            margin: 0 auto;
            width: 100%;
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

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

        .iuiyl-logo img {
            height: 32px;
            display: block;
        }

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

        .iuiyl-nav-item a {
            text-decoration: none;
            color: var(--iuiyl-text);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 4px;
            transition: color 0.3s;
            white-space: nowrap;
        }

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

        .iuiyl-nav-item.iuiyl-active a {
            color: var(--iuiyl-primary);
            position: relative;
        }

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

        /* Hero 区块 - 独特非对称布局 */
        .iuiyl-hero {
            padding: 140px 24px 80px;
            background: radial-gradient(circle at top right, rgba(30,99,255,0.05), transparent),
                        radial-gradient(circle at bottom left, rgba(245,34,45,0.03), transparent);
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
        }

        .iuiyl-hero-content {
            max-width: var(--iuiyl-container);
            width: 100%;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .iuiyl-hero-text {
            flex: 1;
            min-width: 320px;
        }

        .iuiyl-hero-tag {
            display: inline-block;
            padding: 6px 12px;
            background: var(--iuiyl-accent);
            color: var(--iuiyl-primary);
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .iuiyl-hero-title {
            font-size: clamp(2rem, 5vw, 3.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            letter-spacing: -0.02em;
        }

        .iuiyl-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--iuiyl-text-light);
            margin-bottom: 40px;
            max-width: 540px;
        }

        /* 转换核心卡片 */
        .iuiyl-convert-box {
            flex: 1;
            min-width: 320px;
            background: #fff;
            border-radius: 24px;
            padding: 40px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border: 1px solid rgba(0,0,0,0.03);
            text-align: center;
            transition: transform 0.3s ease;
        }

        .iuiyl-convert-box:hover {
            transform: translateY(-8px);
        }

        .iuiyl-drop-area {
            border: 2px dashed #d2d2d7;
            border-radius: var(--iuiyl-radius);
            padding: 60px 20px;
            cursor: pointer;
            transition: all 0.3s;
            margin-bottom: 24px;
        }

        .iuiyl-drop-area:hover {
            border-color: var(--iuiyl-primary);
            background: var(--iuiyl-accent);
        }

        .iuiyl-btn-primary {
            display: inline-block;
            background: var(--iuiyl-primary);
            color: #fff;
            padding: 16px 48px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            font-size: 18px;
            transition: all 0.3s;
            box-shadow: 0 10px 20px rgba(30,99,255,0.2);
        }

        .iuiyl-btn-primary:hover {
            background: #004ecc;
            transform: scale(1.02);
        }

        /* 用户旅程区块 */
        .iuiyl-journey {
            padding: 96px 24px;
            background: var(--iuiyl-bg-soft);
        }

        .iuiyl-section-header {
            max-width: var(--iuiyl-container);
            margin: 0 auto 64px;
            text-align: center;
        }

        .iuiyl-section-title {
            font-size: clamp(1.5rem, 4vw, 2.5rem);
            margin-bottom: 16px;
        }

        .iuiyl-grid {
            max-width: var(--iuiyl-container);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        .iuiyl-step-card {
            background: #fff;
            padding: 40px;
            border-radius: var(--iuiyl-radius);
            transition: all 0.3s;
            min-width: 0;
        }

        .iuiyl-step-num {
            font-size: 48px;
            font-weight: 800;
            color: var(--iuiyl-primary);
            opacity: 0.15;
            margin-bottom: 16px;
        }

        .iuiyl-step-title {
            font-size: 20px;
            margin-bottom: 12px;
            font-weight: 700;
        }

        .iuiyl-step-desc {
            color: var(--iuiyl-text-light);
            font-size: 15px;
        }

        /* 功能特性 - 图文混排 */
        .iuiyl-features {
            padding: 96px 24px;
        }

        .iuiyl-feature-item {
            max-width: var(--iuiyl-container);
            margin: 0 auto 80px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .iuiyl-feature-item:nth-child(even) {
            flex-direction: row-reverse;
        }

        .iuiyl-feature-info {
            flex: 1;
            min-width: 320px;
        }

        .iuiyl-feature-visual {
            flex: 1;
            min-width: 320px;
            height: 360px;
            background: linear-gradient(135deg, #1e63ff, #6495ed);
            border-radius: 32px;
            position: relative;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 900;
            font-size: 80px;
            opacity: 0.9;
        }

        .iuiyl-feature-visual::before {
            content: "PDF";
            position: absolute;
            left: -20px;
            top: 40px;
            opacity: 0.1;
        }

        .iuiyl-feature-visual::after {
            content: "WORD";
            position: absolute;
            right: -20px;
            bottom: 40px;
            opacity: 0.1;
        }

        /* 动态内容区块 */
        .iuiyl-dynamic-section {
            padding: 80px 24px;
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .iuiyl-news-grid {
            max-width: var(--iuiyl-container);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 24px;
        }

        .iuiyl-news-card {
            padding: 24px;
            border: 1px solid #eee;
            border-radius: 12px;
            transition: border-color 0.3s;
            min-width: 0;
        }

        .iuiyl-news-card:hover {
            border-color: var(--iuiyl-primary);
        }

        /* 页脚 */
        .iuiyl-footer {
            background: #1d1d1f;
            color: #fff;
            padding: 80px 24px 40px;
        }

        .iuiyl-footer-content {
            max-width: var(--iuiyl-container);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            justify-content: space-between;
        }

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

        .iuiyl-footer-name {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 24px;
        }

        .iuiyl-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            flex: 2;
        }

        .iuiyl-footer-column {
            min-width: 140px;
        }

        .iuiyl-footer-column h4 {
            font-size: 14px;
            color: rgba(255,255,255,0.4);
            margin-bottom: 20px;
            text-transform: uppercase;
        }

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

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

        .iuiyl-footer-column a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s;
        }

        .iuiyl-footer-column a:hover {
            color: #fff;
        }

        .iuiyl-bottom {
            max-width: var(--iuiyl-container);
            margin: 64px auto 0;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 12px;
            color: rgba(255,255,255,0.4);
            text-align: center;
        }

        /* 响应式断点 */
        @media (max-width: 768px) {
            .iuiyl-hero {
                padding-top: 100px;
                text-align: center;
            }
            .iuiyl-hero-text {
                min-width: 100%;
            }
            .iuiyl-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .iuiyl-grid {
                grid-template-columns: 1fr;
            }
            .iuiyl-feature-item {
                flex-direction: column !important;
                gap: 32px;
            }
            .iuiyl-feature-visual {
                height: 240px;
            }
            .iuiyl-nav-menu {
                display: none; /* 简化移动端处理 */
            }
        }

        /* 动画增强 */
        .iuiyl-step-card:hover {
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }