:root {
            --aisitex-primary: #2962FF;
            --aisitex-secondary: #089981;
            --aisitex-bg: #F8FAFC;
            --aisitex-text: #1E293B;
            --aisitex-text-light: #64748B;
            --aisitex-border: #E2E8F0;
            --aisitex-card-bg: #FFFFFF;
            --aisitex-header-height: 72px;
        }

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

        body {
            font-family: system-ui, -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;
        }

        /* 顶栏与导航 */
        .aisitex-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--aisitex-header-height);
            background: rgba(248, 250, 252, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--aisitex-border);
            z-index: 1000;
            display: flex;
            align-items: center;
        }

        .aisitex-nav-container {
            max-width: 1200px;
            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-text);
        }

        .aisitex-brand img {
            width: 32px;
            height: 32px;
            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;
        }

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

        .aisitex-menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
        }

        .aisitex-menu-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--aisitex-text);
            margin: 5px 0;
            transition: 0.3s;
        }

        .aisitex-nav-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.4);
            z-index: 998;
        }

        /* 主体布局 */
        main {
            padding-top: var(--aisitex-header-height);
        }

        .aisitex-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 首屏区块 */
        .aisitex-hero {
            padding: 64px 0 48px;
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 48px;
            align-items: center;
        }

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

        .aisitex-hero-content p {
            font-size: 17px;
            color: var(--aisitex-text-light);
            margin-bottom: 32px;
            line-height: 1.7;
        }

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

        .aisitex-btn-primary {
            background-color: var(--aisitex-primary);
            color: #FFFFFF;
            padding: 14px 28px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 15px;
            transition: background 0.2s, transform 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .aisitex-btn-primary:hover {
            background-color: #1d4ed8;
            transform: translateY(-1px);
        }

        .aisitex-btn-secondary {
            background-color: transparent;
            color: var(--aisitex-text);
            padding: 14px 28px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 15px;
            border: 1px solid var(--aisitex-border);
            transition: border-color 0.2s, background 0.2s;
        }

        .aisitex-btn-secondary:hover {
            border-color: var(--aisitex-primary);
            background: rgba(41, 98, 255, 0.04);
        }

        .aisitex-hero-card {
            background: #0f172a;
            border-radius: 16px;
            padding: 24px;
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
            color: #FFFFFF;
            position: relative;
            overflow: hidden;
        }

        .aisitex-hero-card img {
            width: 100%;
            height: auto;
            border-radius: 8px;
            display: block;
        }

        /* 章节通用样式 */
        .aisitex-section {
            padding: 80px 0;
            border-top: 1px solid var(--aisitex-border);
        }

        .aisitex-section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 56px;
        }

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

        .aisitex-section-header p {
            font-size: 16px;
            color: var(--aisitex-text-light);
            line-height: 1.6;
        }

        /* 步骤轴引导 (Onboarding Flow) */
        .aisitex-steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .aisitex-step-item {
            background: var(--aisitex-card-bg);
            border: 1px solid var(--aisitex-border);
            border-radius: 12px;
            padding: 24px;
            position: relative;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .aisitex-step-item:hover {
            transform: translateY(-4px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
        }

        .aisitex-step-number {
            font-size: 13px;
            font-weight: 700;
            color: var(--aisitex-primary);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
            display: inline-block;
            background: rgba(41, 98, 255, 0.08);
            padding: 4px 8px;
            border-radius: 4px;
        }

        .aisitex-step-item h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .aisitex-step-item p {
            font-size: 14px;
            color: var(--aisitex-text-light);
            line-height: 1.5;
        }

        /* 功能亮点与大图展示 */
        .aisitex-feature-showcase {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .aisitex-feature-content h3 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .aisitex-feature-content p {
            font-size: 16px;
            color: var(--aisitex-text-light);
            margin-bottom: 24px;
            line-height: 1.6;
        }

        .aisitex-feature-image {
            background: #0f172a;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
        }

        .aisitex-feature-image img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* 状态对照区 */
        .aisitex-comparison-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }

        .aisitex-comparison-card {
            background: var(--aisitex-card-bg);
            border: 1px solid var(--aisitex-border);
            border-radius: 16px;
            padding: 36px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
        }

        .aisitex-comparison-card.after {
            border-color: var(--aisitex-primary);
            background: linear-gradient(135deg, rgba(41, 98, 255, 0.02) 0%, #FFFFFF 100%);
        }

        .aisitex-comparison-tag {
            font-size: 12px;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 20px;
            display: inline-block;
            margin-bottom: 16px;
        }

        .aisitex-comparison-card.before .aisitex-comparison-tag {
            background: #F1F5F9;
            color: var(--aisitex-text-light);
        }

        .aisitex-comparison-card.after .aisitex-comparison-tag {
            background: rgba(41, 98, 255, 0.1);
            color: var(--aisitex-primary);
        }

        .aisitex-comparison-card h3 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .aisitex-comparison-card p {
            font-size: 15px;
            color: var(--aisitex-text-light);
            line-height: 1.6;
        }

        /* 底部行动召唤 (CTA) */
        .aisitex-cta-box {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            border-radius: 24px;
            padding: 64px 32px;
            text-align: center;
            color: #FFFFFF;
            position: relative;
            overflow: hidden;
            margin: 40px 0 80px;
        }

        .aisitex-cta-box h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .aisitex-cta-box p {
            font-size: 16px;
            color: #94a3b8;
            max-width: 600px;
            margin: 0 auto 32px;
            line-height: 1.6;
        }

        .aisitex-cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
        }

        /* 页脚 */
        .aisitex-footer {
            border-top: 1px solid var(--aisitex-border);
            padding: 48px 0;
            background: var(--aisitex-card-bg);
            color: var(--aisitex-text-light);
            font-size: 14px;
        }

        .aisitex-footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .aisitex-footer-links {
            display: flex;
            gap: 24px;
        }

        .aisitex-footer-links a:hover {
            color: var(--aisitex-primary);
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .aisitex-hero {
                grid-template-columns: 1fr;
                gap: 32px;
                padding: 40px 0;
            }

            .aisitex-steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .aisitex-feature-showcase {
                grid-template-columns: 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .aisitex-nav-menu {
                position: fixed;
                top: var(--aisitex-header-height);
                left: -100%;
                width: 100%;
                height: calc(100vh - var(--aisitex-header-height));
                background: var(--aisitex-card-bg);
                flex-direction: column;
                justify-content: flex-start;
                padding: 32px;
                transition: left 0.3s ease;
                border-right: 1px solid var(--aisitex-border);
            }

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

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

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

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

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

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

            .aisitex-cta-buttons {
                flex-direction: column;
            }

            .aisitex-footer-content {
                flex-direction: column;
                gap: 24px;
                text-align: center;
            }
        }

.aisitex-header {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #1E293B;
}

.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: rgba(248, 250, 252, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid #E2E8F0;
            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: #1E293B;
        }

.aisitex-header .aisitex-brand img{
            width: 32px;
            height: 32px;
            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: #64748B;
            transition: color 0.2s;
        }

.aisitex-header .aisitex-nav-link:hover, .aisitex-header .aisitex-nav-link.active{
            color: #2962FF;
        }

.aisitex-header .aisitex-menu-toggle{
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
        }

.aisitex-header .aisitex-menu-toggle span{
            display: block;
            width: 24px;
            height: 2px;
            background: #1E293B;
            margin: 5px 0;
            transition: 0.3s;
        }

@media (max-width: 768px){.aisitex-header .aisitex-nav-menu{
                position: fixed;
                top: 72px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 72px);
                background: #FFFFFF;
                flex-direction: column;
                justify-content: flex-start;
                padding: 32px;
                transition: left 0.3s ease;
                border-right: 1px solid #E2E8F0;
            }

.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: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #1E293B;
}

.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: #1E293B;
        }

.aisitex-footer .aisitex-brand img{
            width: 32px;
            height: 32px;
            object-fit: contain;
        }

.aisitex-footer .aisitex-container{
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

.aisitex-footer{
            border-top: 1px solid #E2E8F0;
            padding: 48px 0;
            background: #FFFFFF;
            color: #64748B;
            font-size: 14px;
        }

.aisitex-footer .aisitex-footer-content{
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

.aisitex-footer .aisitex-footer-links{
            display: flex;
            gap: 24px;
        }

.aisitex-footer .aisitex-footer-links a:hover{
            color: #2962FF;
        }

@media (max-width: 768px){.aisitex-footer .aisitex-footer-content{
                flex-direction: column;
                gap: 24px;
                text-align: center;
            }}