:root {
            --i5tw1i-primary: #FF6C37;
            --i5tw1i-primary-dark: #E05A2B;
            --i5tw1i-secondary: #00D2FF;
            --i5tw1i-dark: #212121;
            --i5tw1i-gray: #F8F9FA;
            --i5tw1i-text: #2D3436;
            --i5tw1i-text-muted: #636E72;
            --i5tw1i-white: #FFFFFF;
            --i5tw1i-max-width: 1100px;
            --i5tw1i-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--i5tw1i-text);
            line-height: 1.8;
            background-color: var(--i5tw1i-white);
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 导航栏设计 - 浮动磨砂效果 */
        .i5tw1i-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);
            padding: 12px 0;
        }

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

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

        .i5tw1i-logo img {
            height: 36px;
            width: auto;
            display: block;
        }

        .i5tw1i-nav-list {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            margin-left: 24px;
        }

        .i5tw1i-nav-item a {
            text-decoration: none;
            color: var(--i5tw1i-text-muted);
            font-size: 14px;
            font-weight: 500;
            transition: var(--i5tw1i-transition);
            padding: 6px 4px;
            position: relative;
        }

        .i5tw1i-nav-item a:hover, 
        .i5tw1i-nav-item a.i5tw1i-active {
            color: var(--i5tw1i-primary);
        }

        .i5tw1i-nav-item a.i5tw1i-active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--i5tw1i-primary);
        }

        /* Hero 区 - 对角线分割布局 */
        .i5tw1i-hero {
            padding: 160px 0 96px;
            background: linear-gradient(135deg, #FFF9F7 0%, #F0F4F8 100%);
            position: relative;
            overflow: hidden;
        }

        .i5tw1i-hero::before {
            content: '';
            position: absolute;
            top: -20%;
            right: -10%;
            width: 60%;
            height: 120%;
            background: rgba(255, 108, 55, 0.03);
            transform: skewX(-15deg);
            z-index: 1;
        }

        .i5tw1i-container {
            max-width: var(--i5tw1i-max-width);
            margin: 0 auto;
            padding: 0 24px;
            position: relative;
            z-index: 2;
        }

        .i5tw1i-hero-grid {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .i5tw1i-hero-content {
            flex: 1 1 500px;
            min-width: 0;
            word-break: break-word;
        }

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

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

        .i5tw1i-download-panel {
            flex: 1 1 400px;
            min-width: 0;
            background: var(--i5tw1i-white);
            padding: 40px;
            border-radius: 24px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border: 1px solid rgba(255, 108, 55, 0.1);
        }

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

        .i5tw1i-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 32px;
            border-radius: 12px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--i5tw1i-transition);
            cursor: pointer;
            border: none;
            font-size: 16px;
        }

        .i5tw1i-btn-primary {
            background: linear-gradient(135deg, var(--i5tw1i-primary) 0%, var(--i5tw1i-primary-dark) 100%);
            color: var(--i5tw1i-white);
            box-shadow: 0 8px 20px rgba(255, 108, 55, 0.3);
        }

        .i5tw1i-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 24px rgba(255, 108, 55, 0.4);
        }

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

        .i5tw1i-btn-outline:hover {
            background: rgba(255, 108, 55, 0.05);
            transform: translateY(-3px);
        }

        /* 核心功能区 - 层级卡片布局 */
        .i5tw1i-section {
            padding: 96px 0;
        }

        .i5tw1i-section-light {
            background-color: var(--i5tw1i-gray);
        }

        .i5tw1i-section-header {
            text-align: center;
            margin-bottom: 64px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        .i5tw1i-section-title {
            font-size: clamp(1.75rem, 3vw, 2.5rem);
            margin-bottom: 16px;
            color: var(--i5tw1i-dark);
        }

        .i5tw1i-grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .i5tw1i-layer-card {
            background: var(--i5tw1i-white);
            padding: 40px;
            border-radius: 20px;
            transition: var(--i5tw1i-transition);
            border: 1px solid rgba(0,0,0,0.03);
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .i5tw1i-layer-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 30px 60px rgba(0,0,0,0.05);
        }

        .i5tw1i-layer-id {
            color: var(--i5tw1i-primary);
            font-weight: 800;
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
            display: block;
        }

        .i5tw1i-layer-title {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--i5tw1i-dark);
        }

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

        .i5tw1i-capability-list {
            list-style: none;
            padding-top: 20px;
            border-top: 1px dashed rgba(0,0,0,0.1);
        }

        .i5tw1i-capability-item {
            font-size: 0.9rem;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            color: var(--i5tw1i-text);
        }

        .i5tw1i-capability-item::before {
            content: '✓';
            color: var(--i5tw1i-primary);
            margin-right: 10px;
            font-weight: bold;
        }

        /* 动态资讯区块 */
        .i5tw1i-news-section {
            background-color: var(--i5tw1i-dark);
            color: var(--i5tw1i-white);
            padding: 80px 0;
        }

        .i5tw1i-news-section .i5tw1i-section-title {
            color: var(--i5tw1i-white);
        }

        .i5tw1i-news-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .i5tw1i-news-item {
            flex: 1 1 300px;
            min-width: 0;
            background: rgba(255, 255, 255, 0.05);
            padding: 32px;
            border-radius: 16px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .i5tw1i-news-date {
            font-size: 0.8rem;
            color: var(--i5tw1i-primary);
            margin-bottom: 8px;
            display: block;
        }

        /* 页脚 */
        .i5tw1i-footer {
            padding: 64px 0 32px;
            background: var(--i5tw1i-gray);
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .i5tw1i-footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
            margin-bottom: 48px;
        }

        .i5tw1i-footer-brand {
            flex: 1 1 300px;
            min-width: 0;
        }

        .i5tw1i-footer-brand-name {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--i5tw1i-dark);
            margin-bottom: 16px;
            display: block;
        }

        .i5tw1i-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
        }

        .i5tw1i-footer-col {
            flex: 0 0 auto;
        }

        .i5tw1i-footer-col h4 {
            margin-bottom: 20px;
            font-size: 1rem;
            color: var(--i5tw1i-dark);
        }

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

        .i5tw1i-footer-col ul li {
            margin-bottom: 10px;
        }

        .i5tw1i-footer-col ul li a {
            text-decoration: none;
            color: var(--i5tw1i-text-muted);
            font-size: 0.9rem;
            transition: var(--i5tw1i-transition);
        }

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

        .i5tw1i-copyright {
            text-align: center;
            padding-top: 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
            font-size: 0.875rem;
            color: var(--i5tw1i-text-muted);
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .i5tw1i-nav-list {
                display: none; /* 简易移动端处理，实际可加汉堡菜单 */
            }
            .i5tw1i-hero {
                padding: 120px 0 64px;
            }
            .i5tw1i-hero-content {
                text-align: center;
            }
            .i5tw1i-btn-group {
                justify-content: center;
            }
            .i5tw1i-download-panel {
                padding: 24px;
            }
        }