:root {
            --vf6p3w-primary: #ff4d4f;
            --vf6p3w-primary-hover: #ff7875;
            --vf6p3w-secondary: #1890ff;
            --vf6p3w-dark: #262626;
            --vf6p3w-light: #f5f5f5;
            --vf6p3w-white: #ffffff;
            --vf6p3w-text-main: #333333;
            --vf6p3w-text-muted: #8c8c8c;
            --vf6p3w-bg-gradient: linear-gradient(135deg, #fff1f0 0%, #e6f7ff 100%);
            --vf6p3w-container-width: 1320px;
            --vf6p3w-radius: 16px;
            --vf6p3w-shadow: 0 10px 30px rgba(0,0,0,0.08);
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--vf6p3w-text-main);
            line-height: 1.6;
            background-color: var(--vf6p3w-white);
            overflow-x: hidden;
            word-break: keep-all;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

        /* Navigation */
        .vf6p3w-nav-wrapper {
            position: fixed;
            top: 24px;
            left: 50%;
            transform: translateX(-50%);
            width: 95%;
            max-width: var(--vf6p3w-container-width);
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(12px);
            border-radius: 50px;
            padding: 12px 32px;
            box-shadow: var(--vf6p3w-shadow);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .vf6p3w-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .vf6p3w-logo img {
            height: 36px;
            width: auto;
        }

        .vf6p3w-menu {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .vf6p3w-menu a {
            font-size: 15px;
            font-weight: 500;
            color: var(--vf6p3w-dark);
            padding: 8px 0;
            position: relative;
        }

        .vf6p3w-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--vf6p3w-primary);
            transition: width 0.3s;
        }

        .vf6p3w-menu a:hover::after,
        .vf6p3w-menu a.active::after {
            width: 100%;
        }

        /* Hero Section */
        .vf6p3w-hero {
            padding: 180px 5% 100px;
            background: var(--vf6p3w-bg-gradient);
            display: flex;
            justify-content: center;
            align-items: center;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .vf6p3w-hero::before {
            content: '';
            position: absolute;
            top: -10%;
            right: -10%;
            width: 40%;
            height: 60%;
            background: radial-gradient(circle, rgba(255,77,79,0.1) 0%, transparent 70%);
            z-index: 0;
        }

        .vf6p3w-hero-content {
            position: relative;
            z-index: 1;
            max-width: 900px;
            word-break: break-word;
        }

        .vf6p3w-hero-title {
            font-size: clamp(2.5rem, 6vw + 1rem, 4.5rem);
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 24px;
            background: linear-gradient(90deg, #1d1d1f, #ff4d4f);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .vf6p3w-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.5rem);
            color: #4b4b4b;
            margin-bottom: 48px;
            line-height: 1.6;
        }

        .vf6p3w-cta-group {
            display: flex;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .vf6p3w-btn-primary {
            background: var(--vf6p3w-primary);
            color: white;
            padding: 18px 48px;
            border-radius: 40px;
            font-size: 1.25rem;
            font-weight: 600;
            box-shadow: 0 10px 20px rgba(255, 77, 79, 0.3);
        }

        .vf6p3w-btn-primary:hover {
            transform: translateY(-3px);
            background: var(--vf6p3w-primary-hover);
            box-shadow: 0 15px 30px rgba(255, 77, 79, 0.4);
        }

        /* Download Options Section */
        .vf6p3w-section {
            padding: 96px 5%;
            max-width: var(--vf6p3w-container-width);
            margin: 0 auto;
        }

        .vf6p3w-grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .vf6p3w-download-card {
            background: var(--vf6p3w-white);
            border: 1px solid #f0f0f0;
            border-radius: var(--vf6p3w-radius);
            padding: 40px;
            transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            position: relative;
            overflow: hidden;
        }

        .vf6p3w-download-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--vf6p3w-shadow);
            border-color: transparent;
        }

        .vf6p3w-card-tag {
            background: #fff1f0;
            color: var(--vf6p3w-primary);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .vf6p3w-card-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .vf6p3w-card-desc {
            color: var(--vf6p3w-text-muted);
            font-size: 15px;
            margin-bottom: 24px;
            line-height: 1.8;
        }

        .vf6p3w-version-info {
            font-size: 13px;
            color: #999;
            margin-top: auto;
            padding-top: 20px;
            border-top: 1px solid #f5f5f5;
            width: 100%;
        }

        /* Features Section - Split Layout */
        .vf6p3w-feature-split {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            margin-top: 80px;
        }

        .vf6p3w-feature-content {
            flex: 1;
            min-width: 300px;
        }

        .vf6p3w-feature-visual {
            flex: 1;
            min-width: 300px;
            background: #f0f5ff;
            height: 400px;
            border-radius: var(--vf6p3w-radius);
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .vf6p3w-feature-visual::after {
            content: 'AI Engine';
            font-size: 40px;
            font-weight: 900;
            color: rgba(24, 144, 255, 0.1);
        }

        /* FAQ Section */
        .vf6p3w-faq-list {
            max-width: 800px;
            margin: 48px auto 0;
        }

        .vf6p3w-faq-item {
            margin-bottom: 24px;
            padding: 24px;
            background: #fafafa;
            border-radius: 12px;
        }

        .vf6p3w-faq-q {
            font-weight: 700;
            font-size: 18px;
            margin-bottom: 8px;
            color: var(--vf6p3w-dark);
        }

        .vf6p3w-faq-a {
            color: #666;
            font-size: 15px;
        }

        /* Footer */
        .vf6p3w-footer {
            background: #1d1d1f;
            color: #d2d2d7;
            padding: 80px 5% 40px;
        }

        .vf6p3w-footer-grid {
            max-width: var(--vf6p3w-container-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            border-bottom: 1px solid #333;
            padding-bottom: 48px;
        }

        .vf6p3w-footer-brand {
            font-size: 20px;
            font-weight: 700;
            color: white;
            margin-bottom: 24px;
        }

        .vf6p3w-footer-links h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 16px;
        }

        .vf6p3w-footer-links ul {
            list-style: none;
        }

        .vf6p3w-footer-links li {
            margin-bottom: 12px;
        }

        .vf6p3w-footer-links a:hover {
            color: var(--vf6p3w-primary);
        }

        .vf6p3w-copyright {
            text-align: center;
            padding-top: 40px;
            font-size: 13px;
            color: #86868b;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .vf6p3w-nav-wrapper {
                padding: 10px 20px;
                top: 10px;
            }
            .vf6p3w-menu {
                display: none; /* In real project, would implement a mobile menu */
            }
            .vf6p3w-hero {
                padding-top: 140px;
            }
            .vf6p3w-grid-3 {
                grid-template-columns: 1fr;
            }
            .vf6p3w-feature-split {
                flex-direction: column;
                text-align: center;
            }
        }

        /* Animation enhancement */
        .vf6p3w-download-card:focus-within {
            outline: 2px solid var(--vf6p3w-primary);
        }