:root {
            --t618w1-primary: #188038;
            --t618w1-blue: #4285F4;
            --t618w1-red: #EA4335;
            --t618w1-yellow: #FBBC05;
            --t618w1-text: #202124;
            --t618w1-bg: #ffffff;
            --t618w1-gray: #f8f9fa;
            --t618w1-transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--t618w1-text);
            line-height: 1.8;
            background-color: var(--t618w1-bg);
            word-break: keep-all;
            overflow-x: hidden;
        }

        /* 导航系统 - 悬浮胶囊设计 */
        .t618w1-nav-wrapper {
            position: fixed;
            top: 24px;
            left: 0;
            width: 100%;
            z-index: 1000;
            display: flex;
            justify-content: center;
            padding: 0 24px;
        }

        .t618w1-nav-container {
            max-width: 1100px;
            width: 100%;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(0, 0, 0, 0.05);
            border-radius: 100px;
            padding: 8px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
            flex-wrap: wrap;
        }

        .t618w1-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .t618w1-logo img {
            height: 32px;
            width: auto;
        }

        .t618w1-menu {
            display: flex;
            list-style: none;
            gap: 8px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .t618w1-menu-item a {
            text-decoration: none;
            color: var(--t618w1-text);
            font-size: 14px;
            font-weight: 500;
            padding: 10px 16px;
            border-radius: 50px;
            transition: var(--t618w1-transition);
            display: inline-block;
        }

        .t618w1-menu-item a:hover {
            background: rgba(0, 0, 0, 0.04);
            color: var(--t618w1-blue);
        }

        .t618w1-menu-item a.active {
            background: var(--t618w1-blue);
            color: white;
        }

        /* Hero 区域 - 全屏视觉冲击 */
        .t618w1-hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 120px 24px 64px;
            background: #000;
            color: #fff;
            overflow: hidden;
        }

        .t618w1-hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.6;
            z-index: 1;
        }

        .t618w1-hero-content {
            position: relative;
            z-index: 2;
            max-width: 900px;
            text-align: center;
            word-break: break-word;
        }

        .t618w1-hero-title {
            font-size: clamp(2.5rem, 6vw + 1rem, 5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            letter-spacing: -0.02em;
        }

        .t618w1-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.5rem);
            opacity: 0.9;
            margin-bottom: 48px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .t618w1-btn-primary {
            display: inline-block;
            background: var(--t618w1-blue);
            color: white;
            padding: 18px 48px;
            border-radius: 100px;
            text-decoration: none;
            font-size: 18px;
            font-weight: 600;
            transition: var(--t618w1-transition);
            border: 2px solid transparent;
        }

        .t618w1-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(66, 133, 244, 0.4);
            background: #3367d6;
        }

        /* 核心优势 - 非对称网格 */
        .t618w1-section {
            padding: 96px 5vw;
            max-width: 1400px;
            margin: 0 auto;
        }

        .t618w1-grid-feature {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
            margin-bottom: 96px;
        }

        .t618w1-feature-text {
            flex: 1;
            min-width: 320px;
        }

        .t618w1-feature-image {
            flex: 1.2;
            min-width: 320px;
            position: relative;
        }

        .t618w1-feature-image img {
            width: 100%;
            border-radius: 24px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.1);
            display: block;
        }

        .t618w1-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(24, 128, 56, 0.1);
            color: var(--t618w1-primary);
            border-radius: 50px;
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .t618w1-section-title {
            font-size: clamp(2rem, 3vw + 0.5rem, 3rem);
            margin-bottom: 24px;
            line-height: 1.2;
        }

        /* 内核进化时间轴 */
        .t618w1-timeline {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-top: 48px;
        }

        .t618w1-timeline-card {
            flex: 1;
            min-width: 300px;
            background: var(--t618w1-gray);
            padding: 32px;
            border-radius: 24px;
            transition: var(--t618w1-transition);
            border: 1px solid rgba(0,0,0,0.03);
        }

        .t618w1-timeline-card:hover {
            background: white;
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
            transform: translateY(-10px);
        }

        .t618w1-version {
            font-family: monospace;
            color: var(--t618w1-blue);
            font-weight: bold;
            display: block;
            margin-bottom: 16px;
        }

        /* 插件集中心 - 卡片组 */
        .t618w1-extension-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            margin-top: 40px;
        }

        .t618w1-extension-category {
            margin-bottom: 64px;
        }

        .t618w1-ext-card {
            background: #fff;
            border: 1px solid #eee;
            padding: 24px;
            border-radius: 16px;
            transition: var(--t618w1-transition);
        }

        .t618w1-ext-card:hover {
            border-color: var(--t618w1-blue);
            box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        }

        .t618w1-ext-name {
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 8px;
            display: block;
        }

        /* FAQ */
        .t618w1-faq-container {
            max-width: 900px;
            margin: 64px auto;
        }

        .t618w1-faq-item {
            border-bottom: 1px solid #eee;
            padding: 24px 0;
        }

        .t618w1-faq-question {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--t618w1-blue);
        }

        /* Footer */
        .t618w1-footer {
            background: #1a1a1a;
            color: #999;
            padding: 80px 5vw 40px;
        }

        .t618w1-footer-content {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            justify-content: space-between;
        }

        .t618w1-footer-brand h3 {
            color: #fff;
            font-size: 24px;
            margin-bottom: 16px;
        }

        .t618w1-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
        }

        .t618w1-footer-group h4 {
            color: #fff;
            margin-bottom: 20px;
        }

        .t618w1-footer-group ul {
            list-style: none;
        }

        .t618w1-footer-group ul li {
            margin-bottom: 10px;
        }

        .t618w1-footer-group a {
            color: #999;
            text-decoration: none;
            transition: 0.3s;
        }

        .t618w1-footer-group a:hover {
            color: var(--t618w1-blue);
        }

        .t618w1-bottom-bar {
            max-width: 1400px;
            margin: 64px auto 0;
            padding-top: 32px;
            border-top: 1px solid #333;
            text-align: center;
            font-size: 14px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .t618w1-nav-container {
                border-radius: 20px;
                padding: 12px;
            }
            .t618w1-menu {
                display: none; /* 简化移动端展示，实际项目中会加汉堡菜单 */
            }
            .t618w1-grid-feature {
                flex-direction: column;
                text-align: center;
            }
            .t618w1-section {
                padding: 64px 24px;
            }
        }