:root {
            --aisitex-primary: #0052D9;
            --aisitex-primary-hover: #003B9E;
            --aisitex-secondary: #16253B;
            --aisitex-bg: #F4F7FC;
            --aisitex-text: #1D2129;
            --aisitex-text-light: #4E5969;
            --aisitex-border: #E5E6EB;
            --aisitex-card-bg: #FFFFFF;
            --aisitex-max-width: 1200px;
        }

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

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

        a {
            text-decoration: none;
            color: inherit;
        }

        /* 顶部导航栏 */
        .aisitex-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 72px;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--aisitex-border);
            z-index: 1000;
            display: flex;
            align-items: center;
        }

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

        .aisitex-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 700;
            font-size: 20px;
            color: var(--aisitex-secondary);
        }

        .aisitex-brand img {
            width: 36px;
            height: 36px;
            border-radius: 8px;
            object-fit: contain;
        }

        .aisitex-nav-menu {
            display: flex;
            gap: 32px;
            align-items: center;
        }

        .aisitex-nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--aisitex-text-light);
            transition: color 0.2s ease;
            position: relative;
            padding: 8px 0;
        }

        .aisitex-nav-link:hover,
        .aisitex-nav-link.active {
            color: var(--aisitex-primary);
        }

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

        .aisitex-nav-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .aisitex-btn-download {
            background-color: var(--aisitex-primary);
            color: #ffffff;
            padding: 10px 20px;
            border-radius: 6px;
            font-weight: 600;
            font-size: 14px;
            transition: background-color 0.2s ease, transform 0.1s ease;
        }

        .aisitex-btn-download:hover {
            background-color: var(--aisitex-primary-hover);
            transform: translateY(-1px);
        }

        .aisitex-menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            width: 30px;
            height: 24px;
            position: relative;
        }

        .aisitex-menu-toggle span {
            display: block;
            position: absolute;
            height: 2px;
            width: 100%;
            background: var(--aisitex-secondary);
            border-radius: 2px;
            transition: 0.3s;
        }

        .aisitex-menu-toggle span:nth-child(1) { top: 0; }
        .aisitex-menu-toggle span:nth-child(2) { top: 11px; }
        .aisitex-menu-toggle span:nth-child(3) { top: 22px; }

        .aisitex-nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.4);
            z-index: 998;
        }

        /* 首页主体结构：上下分层首屏 */
        .aisitex-main {
            padding-top: 72px;
        }

        .aisitex-hero {
            background: linear-gradient(135deg, #16253B 0%, #0A1422 100%);
            color: #ffffff;
            padding: 80px 24px 60px;
            position: relative;
            overflow: hidden;
        }

        .aisitex-hero-container {
            max-width: var(--aisitex-max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .aisitex-hero-content {
            z-index: 2;
        }

        .aisitex-hero-tag {
            display: inline-block;
            background: rgba(0, 82, 217, 0.2);
            color: #4D8BFF;
            padding: 6px 12px;
            border-radius: 4px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 20px;
            border: 1px solid rgba(77, 139, 255, 0.3);
        }

        .aisitex-hero h1 {
            font-size: 42px;
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .aisitex-hero p {
            font-size: 18px;
            color: #A4B1C2;
            margin-bottom: 32px;
            line-height: 1.6;
        }

        .aisitex-hero-actions {
            display: flex;
            gap: 16px;
            align-items: center;
            flex-wrap: wrap;
        }

        .aisitex-btn-primary {
            background-color: var(--aisitex-primary);
            color: white;
            padding: 14px 28px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 16px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.2s;
            box-shadow: 0 4px 12px rgba(0, 82, 217, 0.3);
        }

        .aisitex-btn-primary:hover {
            background-color: #0043b3;
            transform: translateY(-2px);
        }

        .aisitex-btn-secondary {
            background: rgba(255, 255, 255, 0.1);
            color: white;
            padding: 14px 28px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 16px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: all 0.2s;
        }

        .aisitex-btn-secondary:hover {
            background: rgba(255, 255, 255, 0.15);
        }

        .aisitex-hero-media {
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .aisitex-hero-media img {
            width: 100%;
            max-width: 600px;
            height: auto;
            border-radius: 12px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.4);
            border: 1px solid rgba(255,255,255,0.1);
        }

        /* 核心特色区：三栏错落卡片 */
        .aisitex-section {
            padding: 100px 24px;
            max-width: var(--aisitex-max-width);
            margin: 0 auto;
        }

        .aisitex-section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 60px;
        }

        .aisitex-section-header h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--aisitex-secondary);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .aisitex-section-header p {
            font-size: 16px;
            color: var(--aisitex-text-light);
        }

        .aisitex-features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .aisitex-feature-card {
            background: var(--aisitex-card-bg);
            border-radius: 16px;
            padding: 32px;
            border: 1px solid var(--aisitex-border);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .aisitex-feature-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
        }

        .aisitex-feature-content h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--aisitex-secondary);
            margin-bottom: 12px;
        }

        .aisitex-feature-content p {
            font-size: 15px;
            color: var(--aisitex-text-light);
            margin-bottom: 24px;
            line-height: 1.5;
        }

        .aisitex-feature-image {
            width: 100%;
            height: 180px;
            border-radius: 8px;
            overflow: hidden;
            background: #f0f2f5;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .aisitex-feature-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s;
        }

        .aisitex-feature-card:hover .aisitex-feature-image img {
            transform: scale(1.05);
        }

        /* 深色舞台对照区 */
        .aisitex-dark-stage {
            background-color: var(--aisitex-secondary);
            color: #ffffff;
            padding: 100px 24px;
        }

        .aisitex-stage-container {
            max-width: var(--aisitex-max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .aisitex-stage-info h2 {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .aisitex-stage-info p {
            font-size: 16px;
            color: #A4B1C2;
            margin-bottom: 32px;
            line-height: 1.7;
        }

        .aisitex-stage-features-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .aisitex-stage-feature-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
        }

        .aisitex-stage-feature-item svg {
            width: 20px;
            height: 20px;
            fill: #4D8BFF;
            flex-shrink: 0;
            margin-top: 3px;
        }

        .aisitex-stage-feature-item span {
            font-size: 15px;
            color: #E5E6EB;
        }

        .aisitex-stage-images {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .aisitex-stage-images img {
            width: 100%;
            border-radius: 12px;
            box-shadow: 0 16px 32px rgba(0,0,0,0.3);
            border: 1px solid rgba(255,255,255,0.1);
        }

        /* 底部行动引导区 */
        .aisitex-cta-section {
            background: linear-gradient(180deg, var(--aisitex-bg) 0%, #ffffff 100%);
            padding: 100px 24px;
            text-align: center;
        }

        .aisitex-cta-box {
            max-width: 800px;
            margin: 0 auto;
            background: white;
            border: 1px solid var(--aisitex-border);
            border-radius: 24px;
            padding: 60px 40px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.04);
        }

        .aisitex-cta-box h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--aisitex-secondary);
            margin-bottom: 16px;
        }

        .aisitex-cta-box p {
            font-size: 16px;
            color: var(--aisitex-text-light);
            margin-bottom: 32px;
        }

        /* 页脚 */
        .aisitex-footer {
            background-color: #0A1422;
            color: #86909C;
            padding: 60px 24px 30px;
            font-size: 14px;
        }

        .aisitex-footer-container {
            max-width: var(--aisitex-max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .aisitex-footer-col h4 {
            color: #ffffff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .aisitex-footer-col p {
            line-height: 1.6;
            margin-bottom: 16px;
        }

        .aisitex-footer-links {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .aisitex-footer-links a {
            color: #86909C;
            transition: color 0.2s;
        }

        .aisitex-footer-links a:hover {
            color: #ffffff;
        }

        .aisitex-footer-bottom {
            max-width: var(--aisitex-max-width);
            margin: 0 auto;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 30px;
            text-align: center;
            color: #4E5969;
        }

        /* 响应式断点 */
        @media (max-width: 960px) {
            .aisitex-hero-container,
            .aisitex-stage-container {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .aisitex-features-grid {
                grid-template-columns: 1fr;
            }

            .aisitex-footer-container {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }

            .aisitex-hero h1 {
                font-size: 32px;
            }
        }

        @media (max-width: 768px) {
            .aisitex-nav-menu {
                position: fixed;
                top: 72px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 72px);
                background-color: #ffffff;
                flex-direction: column;
                align-items: flex-start;
                padding: 30px;
                gap: 20px;
                transition: left 0.3s ease;
                box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            }

            .aisitex-nav-menu.active {
                left: 0;
            }

            .aisitex-menu-toggle {
                display: block;
            }

            .aisitex-nav-overlay.active {
                display: block;
            }

            .aisitex-footer-container {
                grid-template-columns: 1fr;
            }

            .aisitex-cta-box {
                padding: 40px 20px;
            }
        }

.aisitex-header {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #1D2129;
}

.aisitex-header, .aisitex-header *{
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

.aisitex-header a{
            text-decoration: none;
            color: inherit;
        }

.aisitex-header{
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 72px;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid #E5E6EB;
            z-index: 1000;
            display: flex;
            align-items: center;
        }

.aisitex-header .aisitex-nav-container{
            max-width: 1200px;
            width: 100%;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

.aisitex-header .aisitex-brand{
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 700;
            font-size: 20px;
            color: #16253B;
        }

.aisitex-header .aisitex-brand img{
            width: 36px;
            height: 36px;
            border-radius: 8px;
            object-fit: contain;
        }

.aisitex-header .aisitex-nav-menu{
            display: flex;
            gap: 32px;
            align-items: center;
        }

.aisitex-header .aisitex-nav-link{
            font-size: 15px;
            font-weight: 500;
            color: #4E5969;
            transition: color 0.2s ease;
            position: relative;
            padding: 8px 0;
        }

.aisitex-header .aisitex-nav-link:hover, .aisitex-header .aisitex-nav-link.active{
            color: #0052D9;
        }

.aisitex-header .aisitex-nav-link.active::after{
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: #0052D9;
            border-radius: 2px;
        }

.aisitex-header .aisitex-nav-actions{
            display: flex;
            align-items: center;
            gap: 16px;
        }

.aisitex-header .aisitex-btn-download{
            background-color: #0052D9;
            color: #ffffff;
            padding: 10px 20px;
            border-radius: 6px;
            font-weight: 600;
            font-size: 14px;
            transition: background-color 0.2s ease, transform 0.1s ease;
        }

.aisitex-header .aisitex-btn-download:hover{
            background-color: #003B9E;
            transform: translateY(-1px);
        }

.aisitex-header .aisitex-menu-toggle{
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            width: 30px;
            height: 24px;
            position: relative;
        }

.aisitex-header .aisitex-menu-toggle span{
            display: block;
            position: absolute;
            height: 2px;
            width: 100%;
            background: #16253B;
            border-radius: 2px;
            transition: 0.3s;
        }

.aisitex-header .aisitex-menu-toggle span:nth-child(1){ top: 0; }

.aisitex-header .aisitex-menu-toggle span:nth-child(2){ top: 11px; }

.aisitex-header .aisitex-menu-toggle span:nth-child(3){ top: 22px; }

@media (max-width: 768px){.aisitex-header .aisitex-nav-menu{
                position: fixed;
                top: 72px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 72px);
                background-color: #ffffff;
                flex-direction: column;
                align-items: flex-start;
                padding: 30px;
                gap: 20px;
                transition: left 0.3s ease;
                box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            }

.aisitex-header .aisitex-nav-menu.active{
                left: 0;
            }

.aisitex-header .aisitex-menu-toggle{
                display: block;
            }

.aisitex-header .aisitex-nav-overlay.active{
                display: block;
            }}

.aisitex-footer {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #1D2129;
}

.aisitex-footer, .aisitex-footer *{
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

.aisitex-footer a{
            text-decoration: none;
            color: inherit;
        }

.aisitex-footer .aisitex-brand{
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 700;
            font-size: 20px;
            color: #16253B;
        }

.aisitex-footer .aisitex-brand img{
            width: 36px;
            height: 36px;
            border-radius: 8px;
            object-fit: contain;
        }

.aisitex-footer{
            background-color: #0A1422;
            color: #86909C;
            padding: 60px 24px 30px;
            font-size: 14px;
        }

.aisitex-footer .aisitex-footer-container{
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

.aisitex-footer .aisitex-footer-col h4{
            color: #ffffff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 20px;
        }

.aisitex-footer .aisitex-footer-col p{
            line-height: 1.6;
            margin-bottom: 16px;
        }

.aisitex-footer .aisitex-footer-links{
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

.aisitex-footer .aisitex-footer-links a{
            color: #86909C;
            transition: color 0.2s;
        }

.aisitex-footer .aisitex-footer-links a:hover{
            color: #ffffff;
        }

.aisitex-footer .aisitex-footer-bottom{
            max-width: 1200px;
            margin: 0 auto;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 30px;
            text-align: center;
            color: #4E5969;
        }

@media (max-width: 960px){.aisitex-footer .aisitex-footer-container{
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }}

@media (max-width: 768px){.aisitex-footer .aisitex-footer-container{
                grid-template-columns: 1fr;
            }}