:root {
            --iuiyl-primary: #1e62ec;
            --iuiyl-primary-hover: #164eb3;
            --iuiyl-accent: #ff4d4f;
            --iuiyl-text-main: #262626;
            --iuiyl-text-sub: #595959;
            --iuiyl-bg-light: #f5f7fa;
            --iuiyl-white: #ffffff;
            --iuiyl-shadow: 0 8px 24px rgba(30, 98, 236, 0.08);
            --iuiyl-radius: 16px;
            --iuiyl-container-width: 1100px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--iuiyl-text-main);
            background-color: var(--iuiyl-white);
            line-height: 1.8;
            overflow-x: hidden;
            word-break: keep-all;
            overflow-wrap: break-word;
        }

        /* Navigation */
        .iuiyl-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }

        .iuiyl-nav-container {
            max-width: var(--iuiyl-container-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 72px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            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-link {
            text-decoration: none;
            color: var(--iuiyl-text-sub);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.2s ease;
        }

        .iuiyl-nav-link:hover {
            color: var(--iuiyl-primary);
            background: rgba(30, 98, 236, 0.05);
        }

        .iuiyl-nav-link.iuiyl-active {
            color: var(--iuiyl-primary);
            background: rgba(30, 98, 236, 0.1);
        }

        /* Hero Section */
        .iuiyl-hero {
            padding-top: 140px;
            padding-bottom: 80px;
            background: radial-gradient(circle at 90% 10%, rgba(30, 98, 236, 0.05) 0%, transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(255, 77, 79, 0.05) 0%, transparent 40%);
            text-align: center;
            overflow: hidden;
        }

        .iuiyl-hero-inner {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .iuiyl-hero-tag {
            display: inline-block;
            background: rgba(30, 98, 236, 0.1);
            color: var(--iuiyl-primary);
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .iuiyl-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            line-height: 1.2;
            margin-bottom: 24px;
            background: linear-gradient(135deg, #1e62ec 0%, #00d2ff 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            font-weight: 800;
        }

        .iuiyl-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--iuiyl-text-sub);
            max-width: 700px;
            margin: 0 auto 48px;
        }

        /* Abstract Visual Components */
        .iuiyl-visual-canvas {
            position: relative;
            height: 400px;
            margin-top: 40px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .iuiyl-doc-card {
            position: absolute;
            width: 280px;
            height: 360px;
            background: var(--iuiyl-white);
            border-radius: 12px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            padding: 24px;
            transform: rotate(-5deg) translateX(-100px);
            z-index: 1;
            transition: transform 0.4s ease;
        }

        .iuiyl-doc-card-main {
            position: relative;
            width: 320px;
            height: 400px;
            background: var(--iuiyl-white);
            border-radius: 12px;
            box-shadow: 0 30px 60px rgba(0,0,0,0.12);
            padding: 32px;
            z-index: 2;
        }

        .iuiyl-doc-card-right {
            position: absolute;
            width: 280px;
            height: 360px;
            background: var(--iuiyl-white);
            border-radius: 12px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            padding: 24px;
            transform: rotate(5deg) translateX(100px);
            z-index: 1;
            transition: transform 0.4s ease;
        }

        .iuiyl-doc-card:hover, .iuiyl-doc-card-right:hover {
            transform: translateY(-10px) rotate(0);
            z-index: 3;
        }

        .iuiyl-skeleton-line {
            height: 12px;
            background: #f0f2f5;
            border-radius: 6px;
            margin-bottom: 16px;
            width: 100%;
        }

        /* User Journey Section */
        .iuiyl-section {
            padding: 96px 0;
            max-width: var(--iuiyl-container-width);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .iuiyl-journey-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            margin-top: 64px;
        }

        .iuiyl-journey-item {
            flex: 1;
            min-width: 300px;
            background: var(--iuiyl-bg-light);
            padding: 48px 32px;
            border-radius: var(--iuiyl-radius);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .iuiyl-journey-item:hover {
            background: var(--iuiyl-white);
            box-shadow: var(--iuiyl-shadow);
            transform: translateY(-8px);
        }

        .iuiyl-step-num {
            font-size: 48px;
            font-weight: 900;
            color: rgba(30, 98, 236, 0.1);
            position: absolute;
            top: 20px;
            right: 32px;
        }

        .iuiyl-journey-title {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--iuiyl-primary);
        }

        .iuiyl-journey-desc {
            color: var(--iuiyl-text-sub);
            font-size: 16px;
        }

        /* Features */
        .iuiyl-feature-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            margin-bottom: 96px;
        }

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

        .iuiyl-feature-content {
            flex: 1;
            min-width: 300px;
        }

        .iuiyl-feature-visual {
            flex: 1.2;
            min-width: 300px;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e9f2 100%);
            height: 320px;
            border-radius: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .iuiyl-ai-badge {
            position: absolute;
            top: 20px;
            left: 20px;
            background: #722ed1;
            color: white;
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: bold;
        }

        /* CTA Section */
        .iuiyl-cta {
            background: var(--iuiyl-primary);
            padding: 80px 24px;
            text-align: center;
            border-radius: 32px;
            margin: 0 24px 96px;
            color: var(--iuiyl-white);
        }

        .iuiyl-btn-primary {
            display: inline-block;
            background: var(--iuiyl-white);
            color: var(--iuiyl-primary);
            padding: 16px 48px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 700;
            font-size: 18px;
            transition: all 0.3s ease;
            margin-top: 32px;
        }

        .iuiyl-btn-primary:hover {
            transform: scale(1.05);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }

        /* Footer */
        .iuiyl-footer {
            background: #141414;
            color: #8c8c8c;
            padding: 64px 24px;
        }

        .iuiyl-footer-container {
            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-title {
            color: var(--iuiyl-white);
            font-size: 20px;
            margin-bottom: 16px;
            font-weight: 700;
        }

        .iuiyl-footer-links {
            flex: 2;
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            min-width: 300px;
        }

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

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

        .iuiyl-footer-list a {
            color: #8c8c8c;
            text-decoration: none;
            transition: color 0.2s;
        }

        .iuiyl-footer-list a:hover {
            color: var(--iuiyl-primary);
        }

        .iuiyl-copyright {
            width: 100%;
            padding-top: 48px;
            margin-top: 48px;
            border-top: 1px solid #262626;
            text-align: center;
            font-size: 14px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .iuiyl-nav-menu {
                display: none; /* In a real scenario, this would be a hamburger menu */
            }
            .iuiyl-hero-title {
                font-size: 2.5rem;
            }
            .iuiyl-feature-row {
                flex-direction: column !important;
            }
            .iuiyl-visual-canvas {
                display: none;
            }
        }
    


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