/* 变量定义 */
        :root {
            --i5tw1i-primary: #FF6C37;
            --i5tw1i-primary-dark: #E05220;
            --i5tw1i-secondary: #212121;
            --i5tw1i-text: #333333;
            --i5tw1i-text-light: #666666;
            --i5tw1i-bg-light: #F9F9F9;
            --i5tw1i-white: #FFFFFF;
            --i5tw1i-border: #EEEEEE;
            --i5tw1i-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --i5tw1i-container-width: 1100px;
            --i5tw1i-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* 全局基础样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            color: var(--i5tw1i-text);
            line-height: 1.7;
            background-color: var(--i5tw1i-white);
            word-break: keep-all;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--i5tw1i-transition);
        }

        ul {
            list-style: none;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        /* 布局容器 */
        .i5tw1i-container {
            max-width: var(--i5tw1i-container-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        .i5tw1i-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .i5tw1i-flex-item {
            min-width: 0;
        }

        /* 导航栏设计 */
        .i5tw1i-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--i5tw1i-border);
            padding: 12px 0;
        }

        .i5tw1i-nav-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .i5tw1i-logo {
            flex: 0 0 auto;
            margin-right: 32px;
        }

        .i5tw1i-logo img {
            height: 32px;
            width: auto;
        }

        .i5tw1i-menu {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }

        .i5tw1i-menu-item {
            font-size: 14px;
            font-weight: 500;
            color: var(--i5tw1i-text-light);
            padding: 8px 4px;
            border-bottom: 2px solid transparent;
        }

        .i5tw1i-menu-item:hover {
            color: var(--i5tw1i-primary);
        }

        .i5tw1i-menu-item.active {
            color: var(--i5tw1i-primary);
            border-bottom-color: var(--i5tw1i-primary);
        }

        /* Hero 区块 - 独特非对称布局 */
        .i5tw1i-hero {
            padding: 96px 0 64px;
            background: radial-gradient(circle at top right, #fff5f2 0%, #ffffff 100%);
            position: relative;
            overflow: hidden;
        }

        .i5tw1i-hero::before {
            content: "";
            position: absolute;
            top: -100px;
            right: -100px;
            width: 400px;
            height: 400px;
            background: var(--i5tw1i-primary);
            opacity: 0.03;
            border-radius: 50%;
        }

        .i5tw1i-hero-content {
            max-width: 700px;
            word-break: break-word;
        }

        .i5tw1i-hero-tag {
            display: inline-block;
            background: rgba(255, 108, 55, 0.1);
            color: var(--i5tw1i-primary);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .i5tw1i-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            font-weight: 800;
            color: var(--i5tw1i-secondary);
            margin-bottom: 24px;
        }

        .i5tw1i-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--i5tw1i-text-light);
            margin-bottom: 40px;
            max-width: 600px;
        }

        .i5tw1i-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }

        .i5tw1i-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--i5tw1i-transition);
        }

        .i5tw1i-btn-primary {
            background: var(--i5tw1i-primary);
            color: var(--i5tw1i-white);
            box-shadow: 0 4px 14px rgba(255, 108, 55, 0.3);
        }

        .i5tw1i-btn-primary:hover {
            background: var(--i5tw1i-primary-dark);
            transform: translateY(-2px);
        }

        .i5tw1i-btn-outline {
            border: 2px solid var(--i5tw1i-border);
            color: var(--i5tw1i-secondary);
        }

        .i5tw1i-btn-outline:hover {
            border-color: var(--i5tw1i-secondary);
            background: var(--i5tw1i-secondary);
            color: var(--i5tw1i-white);
        }

        /* 核心概念区块 - 网格布局 */
        .i5tw1i-layers-section {
            padding: 96px 0;
            background-color: var(--i5tw1i-bg-light);
        }

        .i5tw1i-section-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .i5tw1i-section-title {
            font-size: clamp(1.5rem, 3vw, 2.5rem);
            font-weight: 700;
            margin-bottom: 16px;
        }

        .i5tw1i-layers-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .i5tw1i-layer-card {
            background: var(--i5tw1i-white);
            padding: 40px;
            border-radius: 16px;
            box-shadow: var(--i5tw1i-shadow);
            transition: var(--i5tw1i-transition);
            border: 1px solid transparent;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .i5tw1i-layer-card:hover {
            transform: translateY(-8px);
            border-color: var(--i5tw1i-primary);
        }

        .i5tw1i-layer-id {
            font-size: 12px;
            color: var(--i5tw1i-primary);
            font-weight: 700;
            letter-spacing: 1px;
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .i5tw1i-layer-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--i5tw1i-secondary);
        }

        .i5tw1i-layer-logic {
            font-size: 15px;
            color: var(--i5tw1i-text-light);
            margin-bottom: 24px;
            flex-grow: 1;
        }

        .i5tw1i-capability-list {
            margin-top: auto;
            padding-top: 24px;
            border-top: 1px solid var(--i5tw1i-border);
        }

        .i5tw1i-capability-item {
            font-size: 13px;
            color: var(--i5tw1i-text);
            margin-bottom: 8px;
            display: flex;
            align-items: flex-start;
        }

        .i5tw1i-capability-item::before {
            content: "•";
            color: var(--i5tw1i-primary);
            font-weight: bold;
            margin-right: 8px;
        }

        /* 模拟服务工作流 - 左右交替布局 */
        .i5tw1i-workflow-section {
            padding: 96px 0;
        }

        .i5tw1i-workflow-item {
            display: flex;
            align-items: center;
            gap: 64px;
            margin-bottom: 80px;
        }

        .i5tw1i-workflow-item:nth-child(even) {
            flex-direction: row-reverse;
        }

        .i5tw1i-workflow-text {
            flex: 1;
            min-width: 0;
        }

        .i5tw1i-workflow-visual {
            flex: 1;
            min-width: 0;
            background: var(--i5tw1i-secondary);
            border-radius: 12px;
            padding: 32px;
            color: #00ff41;
            font-family: 'Courier New', Courier, monospace;
            box-shadow: 0 20px 40px rgba(0,0,0,0.15);
            font-size: 14px;
            min-height: 240px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .i5tw1i-code-line {
            margin-bottom: 8px;
            white-space: pre-wrap;
            word-break: break-all;
        }

        /* 动态内容区块 */
        .i5tw1i-dynamic-section {
            padding: 64px 0;
            background: #fff;
            border-top: 1px solid var(--i5tw1i-border);
        }

        .i5tw1i-article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }

        .i5tw1i-article-card {
            padding: 24px;
            border-radius: 12px;
            border: 1px solid var(--i5tw1i-border);
            transition: var(--i5tw1i-transition);
        }

        .i5tw1i-article-card:hover {
            box-shadow: var(--i5tw1i-shadow);
            border-color: transparent;
        }

        /* 页脚设计 */
        .i5tw1i-footer {
            background: var(--i5tw1i-secondary);
            color: rgba(255, 255, 255, 0.7);
            padding: 80px 0 32px;
        }

        .i5tw1i-footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 64px;
        }

        .i5tw1i-footer-brand-name {
            font-size: 24px;
            font-weight: 800;
            color: var(--i5tw1i-white);
            margin-bottom: 16px;
        }

        .i5tw1i-footer-slogan {
            font-size: 14px;
            max-width: 300px;
            line-height: 1.6;
        }

        .i5tw1i-footer-title {
            color: var(--i5tw1i-white);
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .i5tw1i-footer-link {
            display: block;
            font-size: 14px;
            margin-bottom: 12px;
            transition: var(--i5tw1i-transition);
        }

        .i5tw1i-footer-link:hover {
            color: var(--i5tw1i-primary);
            transform: translateX(5px);
        }

        .i5tw1i-footer-bottom {
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            font-size: 13px;
        }

        /* 响应式适配 */
        @media (max-width: 992px) {
            .i5tw1i-footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .i5tw1i-hero-content {
                text-align: center;
                margin: 0 auto;
            }
            .i5tw1i-btn-group {
                justify-content: center;
            }
            .i5tw1i-workflow-item, .i5tw1i-workflow-item:nth-child(even) {
                flex-direction: column;
                gap: 32px;
            }
            .i5tw1i-footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .i5tw1i-menu {
                justify-content: center;
                margin-top: 16px;
            }
            .i5tw1i-nav-wrapper {
                justify-content: center;
            }
        }

        /* 动画增强 */
        .i5tw1i-fade-in {
            animation: i5tw1i-fadeIn 0.8s ease-out forwards;
        }

        @keyframes i5tw1i-fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }