:root {
            --i5tw1i-primary: #FF6C37;
            --i5tw1i-primary-dark: #E0521F;
            --i5tw1i-secondary: #0073E6;
            --i5tw1i-bg-light: #F9FAFB;
            --i5tw1i-text-main: #212121;
            --i5tw1i-text-muted: #6B7280;
            --i5tw1i-white: #FFFFFF;
            --i5tw1i-glass: rgba(255, 255, 255, 0.85);
            --i5tw1i-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.1);
            --i5tw1i-radius: 16px;
            --i5tw1i-container-width: 1400px;
        }

        * {
            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-main);
            background-color: var(--i5tw1i-bg-light);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 布局规范 */
        .i5tw1i-container {
            max-width: var(--i5tw1i-container-width);
            margin: 0 auto;
            padding: 0 40px;
            width: 100%;
        }

        @media (max-width: 768px) {
            .i5tw1i-container {
                padding: 0 20px;
            }
        }

        /* 导航栏 */
        .i5tw1i-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: var(--i5tw1i-glass);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }

        .i5tw1i-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: 80px;
            min-width: 0;
        }

        .i5tw1i-logo {
            flex-shrink: 0;
            display: flex;
            align-items: center;
            min-width: 0;
        }

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

        .i5tw1i-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .i5tw1i-menu-item a {
            text-decoration: none;
            color: var(--i5tw1i-text-main);
            font-size: 15px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 8px;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .i5tw1i-menu-item a:hover {
            color: var(--i5tw1i-primary);
            background: rgba(255, 108, 55, 0.05);
        }

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

        @media (max-width: 1100px) {
            .i5tw1i-nav-wrapper {
                height: auto;
                padding: 10px 0;
            }
            .i5tw1i-menu {
                order: 3;
                width: 100%;
                justify-content: center;
                padding: 10px 0;
                gap: 4px;
            }
            .i5tw1i-menu-item a {
                font-size: 13px;
                padding: 6px 10px;
            }
        }

        /* Hero 区域 - 独特非对称布局 */
        .i5tw1i-hero {
            padding: 180px 0 100px;
            background: radial-gradient(circle at 90% 10%, rgba(255, 108, 55, 0.08) 0%, transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(0, 115, 230, 0.05) 0%, transparent 40%);
        }

        .i5tw1i-hero-flex {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            min-width: 0;
        }

        .i5tw1i-hero-content {
            flex: 1;
            min-width: 320px;
        }

        .i5tw1i-hero-visual {
            flex: 1;
            min-width: 320px;
            position: relative;
        }

        .i5tw1i-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 24px;
            color: #002D5B;
        }

        .i5tw1i-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--i5tw1i-text-muted);
            margin-bottom: 40px;
            max-width: 600px;
        }

        /* 抽象视觉图形替代缺失图片 */
        .i5tw1i-abstract-ui {
            background: var(--i5tw1i-white);
            border-radius: 24px;
            padding: 30px;
            box-shadow: var(--i5tw1i-shadow);
            border: 1px solid rgba(0,0,0,0.05);
            transform: perspective(1000px) rotateY(-15deg) rotateX(5deg);
        }

        .i5tw1i-ui-line {
            height: 12px;
            background: #E5E7EB;
            border-radius: 6px;
            margin-bottom: 16px;
        }

        .i5tw1i-ui-line.i5tw1i-short { width: 40%; }
        .i5tw1i-ui-line.i5tw1i-mid { width: 70%; }
        .i5tw1i-ui-line.i5tw1i-accent { background: var(--i5tw1i-primary); width: 25%; }

        /* 核心能力层级 */
        .i5tw1i-layers-section {
            padding: 80px 0;
        }

        .i5tw1i-layers-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 32px;
        }

        @media (max-width: 768px) {
            .i5tw1i-layers-grid {
                grid-template-columns: 1fr;
            }
        }

        .i5tw1i-layer-card {
            background: var(--i5tw1i-white);
            padding: 48px;
            border-radius: var(--i5tw1i-radius);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            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 20px 40px rgba(0,0,0,0.08);
            border-color: var(--i5tw1i-primary);
        }

        .i5tw1i-layer-id {
            font-family: monospace;
            color: var(--i5tw1i-primary);
            font-weight: bold;
            margin-bottom: 16px;
            display: block;
            letter-spacing: 2px;
        }

        .i5tw1i-layer-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 20px;
        }

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

        .i5tw1i-capability-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .i5tw1i-capability-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            font-weight: 500;
        }

        .i5tw1i-capability-item::before {
            content: "✓";
            color: var(--i5tw1i-secondary);
            font-weight: bold;
        }

        /* 动态内容区块 */
        .i5tw1i-dynamic-section {
            padding: 100px 0;
            background: #002D5B;
            color: var(--i5tw1i-white);
            border-radius: 40px;
            margin: 0 20px 80px;
        }

        .i5tw1i-dynamic-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .i5tw1i-dynamic-header h2 {
            font-size: 42px;
            margin-bottom: 16px;
        }

        .i5tw1i-article-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            justify-content: center;
        }

        .i5tw1i-article-mini {
            flex: 1;
            min-width: 280px;
            background: rgba(255, 255, 255, 0.05);
            padding: 30px;
            border-radius: 20px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        /* 按钮设计 */
        .i5tw1i-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }

        .i5tw1i-btn {
            display: inline-block;
            padding: 16px 32px;
            border-radius: 12px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            text-align: center;
            min-width: 160px;
        }

        .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: scale(1.05);
        }

        .i5tw1i-btn-outline {
            border: 2px solid #E5E7EB;
            color: var(--i5tw1i-text-main);
        }

        .i5tw1i-btn-outline:hover {
            border-color: var(--i5tw1i-primary);
            color: var(--i5tw1i-primary);
        }

        /* 页脚 */
        .i5tw1i-footer {
            background: var(--i5tw1i-white);
            padding: 80px 0 40px;
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .i5tw1i-footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 60px;
        }

        @media (max-width: 992px) {
            .i5tw1i-footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 576px) {
            .i5tw1i-footer-grid {
                grid-template-columns: 1fr;
            }
        }

        .i5tw1i-footer-brand h3 {
            font-size: 24px;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--i5tw1i-primary);
        }

        .i5tw1i-footer-brand p {
            color: var(--i5tw1i-text-muted);
            max-width: 300px;
        }

        .i5tw1i-footer-links h4 {
            margin-bottom: 24px;
            font-size: 16px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

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

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

        .i5tw1i-footer-links a {
            color: var(--i5tw1i-text-muted);
            text-decoration: none;
            transition: color 0.2s;
        }

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

        .i5tw1i-footer-bottom {
            padding-top: 40px;
            border-top: 1px solid rgba(0,0,0,0.05);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            color: var(--i5tw1i-text-muted);
            font-size: 14px;
            gap: 20px;
        }