:root {
            --t618w1-primary: #1a73e8;
            --t618w1-accent: #188038;
            --t618w1-red: #ea4335;
            --t618w1-yellow: #fbbc04;
            --t618w1-text: #202124;
            --t618w1-text-light: #5f6368;
            --t618w1-bg: #ffffff;
            --t618w1-bg-alt: #f8f9fa;
            --t618w1-radius: 16px;
            --t618w1-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --t618w1-max-width: 1320px;
        }

        * {
            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: break-word;
            overflow-x: hidden;
        }

        /* 导航栏 */
        .t618w1-header {
            position: fixed;
            top: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

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

        .t618w1-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .t618w1-logo img {
            height: 32px;
            display: block;
        }

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

        .t618w1-nav-item {
            margin-left: 8px;
        }

        .t618w1-nav-link {
            text-decoration: none;
            color: var(--t618w1-text-light);
            padding: 8px 16px;
            font-size: 0.95rem;
            font-weight: 500;
            border-radius: 8px;
            transition: all 0.2s;
            white-space: nowrap;
        }

        .t618w1-nav-link:hover {
            color: var(--t618w1-primary);
            background: rgba(26, 115, 232, 0.05);
        }

        .t618w1-nav-link.t618w1-active {
            color: var(--t618w1-primary);
            background: rgba(26, 115, 232, 0.1);
        }

        /* Hero 区 - 独特布局 */
        .t618w1-hero {
            padding: 160px 24px 80px;
            background: radial-gradient(circle at 10% 20%, rgba(26, 115, 232, 0.03) 0%, rgba(255, 255, 255, 1) 90%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .t618w1-hero-content {
            max-width: 900px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .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;
            word-break: keep-all;
        }

        .t618w1-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            color: var(--t618w1-text-light);
            max-width: 700px;
            margin: 0 auto 48px;
        }

        .t618w1-hero-visual {
            margin-top: 64px;
            display: flex;
            justify-content: center;
            perspective: 1000px;
        }

        .t618w1-browser-mockup {
            width: 100%;
            max-width: 1000px;
            background: #fff;
            border-radius: 20px 20px 0 0;
            box-shadow: 0 40px 100px rgba(0,0,0,0.1);
            border: 1px solid rgba(0,0,0,0.1);
            transform: rotateX(5deg);
            overflow: hidden;
        }

        .t618w1-browser-header {
            height: 40px;
            background: #f1f3f4;
            display: flex;
            align-items: center;
            padding: 0 16px;
        }

        .t618w1-dot { height: 12px; width: 12px; border-radius: 50%; margin-right: 8px; }
        .t618w1-dot-1 { background: #ff5f56; }
        .t618w1-dot-2 { background: #ffbd2e; }
        .t618w1-dot-3 { background: #27c93f; }

        /* 主题展示区 */
        .t618w1-section {
            padding: 96px 24px;
            max-width: var(--t618w1-max-width);
            margin: 0 auto;
        }

        .t618w1-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .t618w1-card {
            background: var(--t618w1-bg);
            border-radius: var(--t618w1-radius);
            padding: 0;
            overflow: hidden;
            border: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .t618w1-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--t618w1-shadow);
        }

        .t618w1-card-img-box {
            height: 200px;
            background: #eee;
            position: relative;
            overflow: hidden;
        }

        .t618w1-card-img-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .t618w1-card:hover .t618w1-card-img-box img {
            transform: scale(1.05);
        }

        .t618w1-card-content {
            padding: 24px;
        }

        .t618w1-card-tag {
            font-size: 0.75rem;
            color: var(--t618w1-primary);
            text-transform: uppercase;
            font-weight: 700;
            margin-bottom: 8px;
            display: block;
        }

        .t618w1-card-title {
            font-size: 1.5rem;
            margin-bottom: 12px;
            font-weight: 700;
        }

        /* 内核进化时间轴 */
        .t618w1-timeline {
            background: #000;
            color: #fff;
            border-radius: 32px;
            padding: 64px;
            margin: 80px 0;
        }

        .t618w1-timeline-item {
            border-left: 2px solid var(--t618w1-primary);
            padding-left: 32px;
            padding-bottom: 48px;
            position: relative;
            min-width: 0;
        }

        .t618w1-timeline-item::before {
            content: '';
            position: absolute;
            left: -9px;
            top: 0;
            width: 16px;
            height: 16px;
            background: var(--t618w1-primary);
            border-radius: 50%;
        }

        .t618w1-milestone {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: #fff;
        }

        .t618w1-timeline-badge {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(255,255,255,0.1);
            border-radius: 20px;
            font-size: 0.85rem;
            margin-right: 12px;
            margin-bottom: 12px;
        }

        /* FAQ 区域 */
        .t618w1-faq {
            background: var(--t618w1-bg-alt);
            border-radius: 32px;
            padding: 64px 48px;
        }

        .t618w1-faq-item {
            margin-bottom: 32px;
            border-bottom: 1px solid rgba(0,0,0,0.1);
            padding-bottom: 24px;
        }

        .t618w1-faq-q {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--t618w1-primary);
        }

        /* 页脚 */
        .t618w1-footer {
            background: #f8f9fa;
            padding: 80px 24px 40px;
            border-top: 1px solid rgba(0,0,0,0.05);
        }

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

        .t618w1-footer-brand {
            flex: 0 0 300px;
            margin-bottom: 40px;
            min-width: 0;
        }

        .t618w1-brand-name {
            font-size: 1.5rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--t618w1-text);
        }

        .t618w1-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            min-width: 0;
        }

        .t618w1-footer-col h4 {
            margin-bottom: 20px;
            font-size: 1rem;
        }

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

        .t618w1-footer-col li {
            margin-bottom: 12px;
        }

        .t618w1-footer-col a {
            text-decoration: none;
            color: var(--t618w1-text-light);
            transition: color 0.2s;
        }

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

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

        /* 响应式调整 */
        @media (max-width: 768px) {
            .t618w1-nav-container { height: auto; padding: 16px; }
            .t618w1-nav-menu { margin-top: 16px; width: 100%; justify-content: center; }
            .t618w1-nav-item { margin: 4px; }
            .t618w1-hero { padding-top: 120px; }
            .t618w1-timeline { padding: 32px; }
            .t618w1-faq { padding: 32px 20px; }
            .t618w1-footer-links { gap: 24px; }
        }