:root {
            --t618w1-primary: #188038;
            --t618w1-primary-light: #e6f4ea;
            --t618w1-accent: #1a73e8;
            --t618w1-text-main: #202124;
            --t618w1-text-muted: #5f6368;
            --t618w1-bg: #ffffff;
            --t618w1-bg-alt: #f8f9fa;
            --t618w1-gap: 8px;
            --t618w1-radius: 16px;
            --t618w1-container: 1320px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--t618w1-text-main);
            background-color: var(--t618w1-bg);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 导航系统 */
        .t618w1-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            width: 100%;
        }

        .t618w1-nav-container {
            max-width: var(--t618w1-container);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
        }

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

        .t618w1-logo img {
            height: 36px;
            width: auto;
        }

        .t618w1-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .t618w1-nav-link {
            text-decoration: none;
            color: var(--t618w1-text-muted);
            font-weight: 500;
            font-size: 15px;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .t618w1-nav-link:hover {
            color: var(--t618w1-primary);
            background: var(--t618w1-primary-light);
        }

        .t618w1-nav-link.active {
            color: var(--t618w1-primary);
            background: var(--t618w1-primary-light);
        }

        /* 核心 Hero 下载区 */
        .t618w1-hero {
            padding: 80px 24px;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            background: radial-gradient(circle at top right, #e6f4ea 0%, #ffffff 50%);
        }

        .t618w1-hero-content {
            max-width: 900px;
            margin-bottom: 48px;
            word-break: break-word;
        }

        .t618w1-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            letter-spacing: -1px;
            color: #1a1a1a;
        }

        .t618w1-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--t618w1-text-muted);
            max-width: 700px;
            margin: 0 auto;
        }

        .t618w1-download-visual {
            position: relative;
            width: 100%;
            max-width: 1100px;
            margin-top: 32px;
            border-radius: var(--t618w1-radius);
            box-shadow: 0 40px 100px rgba(0,0,0,0.1);
            overflow: hidden;
        }

        .t618w1-download-visual img {
            width: 100%;
            height: auto;
            display: block;
        }

        .t618w1-hero-cta {
            position: absolute;
            bottom: 40px;
            left: 50%;
            transform: translateX(-50%);
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            padding: 24px 48px;
            border-radius: 60px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 12px;
            min-width: 320px;
        }

        .t618w1-btn-main {
            display: inline-block;
            background: var(--t618w1-primary);
            color: white;
            padding: 18px 48px;
            border-radius: 40px;
            text-decoration: none;
            font-size: 1.25rem;
            font-weight: 600;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            box-shadow: 0 8px 20px rgba(24, 128, 56, 0.3);
        }

        .t618w1-btn-main:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 25px rgba(24, 128, 56, 0.4);
        }

        /* 跨平台版本区 */
        .t618w1-section-versions {
            padding: 96px 24px;
            background-color: var(--t618w1-bg-alt);
        }

        .t618w1-grid-split {
            max-width: var(--t618w1-container);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            align-items: center;
        }

        .t618w1-split-image {
            flex: 1;
            min-width: 320px;
        }

        .t618w1-split-image img {
            width: 100%;
            border-radius: var(--t618w1-radius);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
        }

        .t618w1-split-text {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

        .t618w1-version-list {
            margin-top: 32px;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }

        .t618w1-version-card {
            background: white;
            padding: 24px;
            border-radius: 12px;
            flex: 1;
            min-width: 200px;
            border: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .t618w1-version-card:hover {
            border-color: var(--t618w1-primary);
            transform: translateY(-5px);
        }

        /* 内核演进 Timeline */
        .t618w1-section-timeline {
            padding: 96px 24px;
            max-width: 1100px;
            margin: 0 auto;
        }

        .t618w1-section-title {
            text-align: center;
            font-size: clamp(2rem, 3vw, 2.5rem);
            margin-bottom: 64px;
        }

        .t618w1-timeline-container {
            position: relative;
        }

        .t618w1-timeline-item {
            display: flex;
            flex-wrap: wrap;
            margin-bottom: 48px;
            padding-left: 32px;
            border-left: 3px solid var(--t618w1-primary-light);
            position: relative;
        }

        .t618w1-timeline-item::before {
            content: '';
            position: absolute;
            left: -9px;
            top: 0;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--t618w1-primary);
        }

        .t618w1-timeline-content {
            flex: 1;
            min-width: 0;
        }

        .t618w1-milestone {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--t618w1-primary);
            margin-bottom: 12px;
        }

        .t618w1-feature-tag {
            display: inline-block;
            background: var(--t618w1-bg-alt);
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 0.9rem;
            margin-right: 8px;
            margin-bottom: 8px;
        }

        /* 插件中心 */
        .t618w1-section-extensions {
            padding: 96px 24px;
            background: #1a1a1a;
            color: #fff;
        }

        .t618w1-extension-grid {
            max-width: var(--t618w1-container);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .t618w1-ext-group-title {
            grid-column: 1 / -1;
            margin-bottom: 16px;
            color: var(--t618w1-primary);
            font-size: 1.2rem;
            text-transform: uppercase;
            letter-spacing: 2px;
        }

        .t618w1-ext-card {
            background: rgba(255,255,255,0.05);
            padding: 32px;
            border-radius: 16px;
            border: 1px solid rgba(255,255,255,0.1);
            transition: all 0.3s ease;
        }

        .t618w1-ext-card:hover {
            background: rgba(255,255,255,0.1);
            transform: scale(1.02);
        }

        .t618w1-ext-name {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: #fff;
        }

        .t618w1-ext-desc {
            color: #aaa;
            font-size: 0.95rem;
        }

        /* 安装指南 */
        .t618w1-section-guide {
            padding: 96px 24px;
        }

        .t618w1-guide-box {
            max-width: var(--t618w1-container);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
            background: #fff;
            border-radius: 32px;
            padding: 48px;
            box-shadow: 0 30px 60px rgba(0,0,0,0.03);
        }

        .t618w1-guide-steps {
            flex: 1;
            min-width: 320px;
        }

        .t618w1-step-item {
            margin-bottom: 32px;
            display: flex;
            gap: 20px;
        }

        .t618w1-step-num {
            width: 40px;
            height: 40px;
            background: var(--t618w1-primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            flex-shrink: 0;
        }

        /* FAQ */
        .t618w1-faq {
            padding: 96px 24px;
            background: var(--t618w1-bg-alt);
        }

        .t618w1-faq-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .t618w1-faq-item {
            background: white;
            margin-bottom: 16px;
            border-radius: 12px;
            padding: 24px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
        }

        .t618w1-faq-q {
            font-weight: 700;
            margin-bottom: 12px;
            font-size: 1.1rem;
        }

        .t618w1-faq-a {
            color: var(--t618w1-text-muted);
        }

        /* 页脚 */
        .t618w1-footer {
            padding: 80px 24px 40px;
            background: #f1f3f4;
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .t618w1-footer-content {
            max-width: var(--t618w1-container);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .t618w1-footer-brand {
            flex: 1;
            min-width: 250px;
        }

        .t618w1-footer-links {
            flex: 2;
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            min-width: 300px;
        }

        .t618w1-footer-col h4 {
            margin-bottom: 20px;
            color: var(--t618w1-text-main);
        }

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

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

        .t618w1-footer-col a {
            text-decoration: none;
            color: var(--t618w1-text-muted);
            transition: color 0.3s;
        }

        .t618w1-footer-col a:hover {
            color: var(--t618w1-primary);
        }

        .t618w1-copyright {
            max-width: var(--t618w1-container);
            margin: 40px auto 0;
            padding-top: 24px;
            border-top: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            color: #9aa0a6;
            font-size: 0.9rem;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .t618w1-nav-menu {
                display: none; /* 简化移动端，实际开发中需添加汉堡菜单 */
            }
            .t618w1-hero {
                padding: 48px 20px;
            }
            .t618w1-hero-cta {
                width: 90%;
                min-width: 0;
                padding: 16px;
                bottom: 20px;
            }
            .t618w1-guide-box {
                padding: 24px;
            }
        }