:root {
            --i5tw1i-primary: #FF6C37;
            --i5tw1i-primary-hover: #e55b2b;
            --i5tw1i-dark: #1C272B;
            --i5tw1i-dark-accent: #212121;
            --i5tw1i-light: #FFFFFF;
            --i5tw1i-gray-100: #F9F9F9;
            --i5tw1i-gray-200: #E6E6E6;
            --i5tw1i-text: #333333;
            --i5tw1i-text-muted: #666666;
            --i5tw1i-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --i5tw1i-max-width: 1300px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--i5tw1i-text);
            line-height: 1.6;
            background-color: var(--i5tw1i-light);
            word-break: keep-all;
            overflow-wrap: break-word;
        }

        /* 导航栏样式 */
        .i5tw1i-navbar {
            position: fixed;
            top: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid var(--i5tw1i-gray-200);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }

        .i5tw1i-nav-container {
            max-width: var(--i5tw1i-max-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding: 0 24px;
            height: 72px;
        }

        .i5tw1i-logo {
            flex-shrink: 0;
            min-width: 0;
        }

        .i5tw1i-logo img {
            height: 40px;
            display: block;
        }

        .i5tw1i-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .i5tw1i-menu-item a {
            text-decoration: none;
            color: var(--i5tw1i-dark);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 4px;
            transition: var(--i5tw1i-transition);
            border-bottom: 2px solid transparent;
        }

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

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

        /* Hero 区块 */
        .i5tw1i-hero {
            position: relative;
            padding-top: 72px;
            min-height: 85vh;
            display: flex;
            align-items: center;
            overflow: hidden;
            background-color: var(--i5tw1i-dark);
        }

        .i5tw1i-hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.4;
            z-index: 1;
        }

        .i5tw1i-hero-content {
            position: relative;
            z-index: 2;
            max-width: var(--i5tw1i-max-width);
            margin: 0 auto;
            padding: 64px 24px;
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
        }

        .i5tw1i-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            color: var(--i5tw1i-light);
            max-width: 850px;
            margin-bottom: 24px;
            word-break: break-word;
        }

        .i5tw1i-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: rgba(255, 255, 255, 0.85);
            max-width: 650px;
            margin-bottom: 48px;
            line-height: 1.5;
        }

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

        .i5tw1i-btn {
            display: inline-block;
            padding: 16px 40px;
            border-radius: 8px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--i5tw1i-transition);
            text-align: center;
            min-width: 0;
        }

        .i5tw1i-btn-primary {
            background-color: var(--i5tw1i-primary);
            color: var(--i5tw1i-light);
        }

        .i5tw1i-btn-primary:hover {
            background-color: var(--i5tw1i-primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(255, 108, 55, 0.3);
        }

        /* 核心能力区块 (Grid 布局) */
        .i5tw1i-layers {
            padding: 96px 24px;
            max-width: var(--i5tw1i-max-width);
            margin: 0 auto;
        }

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

        .i5tw1i-section-tag {
            color: var(--i5tw1i-primary);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            display: block;
            margin-bottom: 16px;
        }

        .i5tw1i-section-title {
            font-size: clamp(2rem, 3vw, 2.8rem);
            font-weight: 800;
            color: var(--i5tw1i-dark);
        }

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

        .i5tw1i-card {
            background: var(--i5tw1i-gray-100);
            padding: 48px;
            border-radius: 16px;
            transition: var(--i5tw1i-transition);
            border: 1px solid var(--i5tw1i-gray-200);
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .i5tw1i-card:hover {
            transform: translateY(-10px);
            background: var(--i5tw1i-light);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border-color: var(--i5tw1i-primary);
        }

        .i5tw1i-card-id {
            font-size: 0.9rem;
            color: var(--i5tw1i-primary);
            font-weight: bold;
            margin-bottom: 16px;
        }

        .i5tw1i-card-title {
            font-size: 1.6rem;
            margin-bottom: 20px;
            color: var(--i5tw1i-dark);
        }

        .i5tw1i-card-desc {
            color: var(--i5tw1i-text-muted);
            margin-bottom: 32px;
            flex-grow: 1;
        }

        .i5tw1i-card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .i5tw1i-tag {
            background: rgba(255, 108, 55, 0.1);
            color: var(--i5tw1i-primary);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
        }

        /* 协作展示区块 (左右结构) */
        .i5tw1i-feature-split {
            background-color: var(--i5tw1i-dark-accent);
            color: var(--i5tw1i-light);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
        }

        .i5tw1i-split-text {
            flex: 1;
            min-width: 320px;
            padding: 96px 80px;
        }

        .i5tw1i-split-visual {
            flex: 1;
            min-width: 320px;
            position: relative;
            overflow: hidden;
            height: 600px;
        }

        .i5tw1i-split-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .i5tw1i-split-title {
            font-size: clamp(1.8rem, 2.5vw, 2.5rem);
            margin-bottom: 24px;
            line-height: 1.3;
        }

        .i5tw1i-split-desc {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 40px;
            line-height: 1.8;
        }

        /* 生态集成区块 (图文混排) */
        .i5tw1i-ecosystem {
            padding: 96px 24px;
            max-width: var(--i5tw1i-max-width);
            margin: 0 auto;
            text-align: center;
        }

        .i5tw1i-integration-img {
            width: 100%;
            max-width: 1000px;
            border-radius: 24px;
            margin: 64px auto 0;
            box-shadow: 0 30px 60px rgba(0,0,0,0.1);
            display: block;
        }

        /* 资讯区块标记 */
        .i5tw1i-news-section {
            padding: 80px 24px;
            background: var(--i5tw1i-gray-100);
        }

        /* 页脚样式 */
        .i5tw1i-footer {
            position: relative;
            background-color: var(--i5tw1i-dark);
            color: var(--i5tw1i-light);
            padding: 96px 24px 48px;
            overflow: hidden;
        }

        .i5tw1i-footer-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.1;
            pointer-events: none;
        }

        .i5tw1i-footer-content {
            position: relative;
            z-index: 2;
            max-width: var(--i5tw1i-max-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 64px;
        }

        .i5tw1i-footer-brand {
            flex: 1;
            min-width: 280px;
        }

        .i5tw1i-footer-logo-text {
            font-size: 2rem;
            font-weight: 800;
            color: var(--i5tw1i-primary);
            margin-bottom: 24px;
        }

        .i5tw1i-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            flex: 2;
            min-width: 320px;
        }

        .i5tw1i-footer-col {
            min-width: 140px;
        }

        .i5tw1i-footer-col h4 {
            margin-bottom: 24px;
            font-size: 1.1rem;
            color: var(--i5tw1i-light);
        }

        .i5tw1i-footer-col ul {
            list-style: none;
        }

        .i5tw1i-footer-col li {
            margin-bottom: 12px;
        }

        .i5tw1i-footer-col a {
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
            transition: var(--i5tw1i-transition);
        }

        .i5tw1i-footer-col a:hover {
            color: var(--i5tw1i-primary);
        }

        .i5tw1i-footer-bottom {
            position: relative;
            z-index: 2;
            max-width: var(--i5tw1i-max-width);
            margin: 64px auto 0;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            color: rgba(255, 255, 255, 0.4);
            font-size: 0.9rem;
        }

        /* 响应式适配 */
        @media (max-width: 992px) {
            .i5tw1i-split-text {
                padding: 64px 32px;
            }
            .i5tw1i-split-visual {
                height: 400px;
            }
        }

        @media (max-width: 768px) {
            .i5tw1i-menu {
                display: none; /* 简化演示：移动端隐藏主菜单，实际项目中可使用汉堡菜单 */
            }
            .i5tw1i-hero-content {
                padding: 48px 24px;
            }
            .i5tw1i-hero-title {
                font-size: 2.8rem;
            }
            .i5tw1i-split-text, .i5tw1i-split-visual {
                flex: 0 0 100%;
            }
        }