:root {
            --qdmij8-primary: #3ded97;
            --qdmij8-bg-dark: #0a0a0a;
            --qdmij8-card-bg: #161616;
            --qdmij8-text-main: #f3f4f6;
            --qdmij8-text-dim: #a1a1aa;
            --qdmij8-accent: #60a5fa;
            --qdmij8-gradient: linear-gradient(135deg, #3ded97 0%, #60a5fa 100%);
            --qdmij8-spacing-unit: 8px;
        }

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

        body {
            background-color: var(--qdmij8-bg-dark);
            color: var(--qdmij8-text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 布局容器 */
        .qdmij8-container {
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* 导航栏 */
        .qdmij8-nav-wrapper {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 10, 10, 0.8);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .qdmij8-nav-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }

        .qdmij8-logo {
            min-width: 0;
            display: flex;
            align-items: center;
        }

        .qdmij8-logo img {
            height: 32px;
            width: auto;
            border-radius: 4px;
        }

        .qdmij8-menu {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            list-style: none;
            min-width: 0;
        }

        .qdmij8-menu a {
            color: var(--qdmij8-text-dim);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .qdmij8-menu a:hover, .qdmij8-menu a.active {
            color: var(--qdmij8-primary);
        }

        /* Hero下载区 - 非对称布局 */
        .qdmij8-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .qdmij8-hero-content {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

        .qdmij8-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            background: var(--qdmij8-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .qdmij8-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            color: var(--qdmij8-text-dim);
            margin-bottom: 48px;
            max-width: 600px;
        }

        .qdmij8-hero-visual {
            flex: 1.2;
            min-width: 320px;
            position: relative;
        }

        .qdmij8-main-img {
            width: 100%;
            height: auto;
            border-radius: 24px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        /* 下载按钮矩阵 */
        .qdmij8-download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 24px;
            margin-top: 32px;
        }

        .qdmij8-btn-download {
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 32px 24px;
            background: var(--qdmij8-card-bg);
            border: 1px solid rgba(255, 255, 255, 0.05);
            border-radius: 16px;
            text-decoration: none;
            color: white;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .qdmij8-btn-download:hover {
            transform: translateY(-8px);
            border-color: var(--qdmij8-primary);
            background: rgba(61, 237, 151, 0.05);
        }

        .qdmij8-btn-icon {
            font-size: 32px;
            margin-bottom: 16px;
        }

        .qdmij8-btn-text {
            font-weight: 700;
            font-size: 18px;
        }

        .qdmij8-btn-subtext {
            font-size: 12px;
            color: var(--qdmij8-text-dim);
            margin-top: 4px;
        }

        /* 技术支柱区块 */
        .qdmij8-pillars {
            padding: 96px 0;
            background: linear-gradient(to bottom, transparent, #0f0f0f, transparent);
        }

        .qdmij8-section-tag {
            color: var(--qdmij8-primary);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 16px;
            display: block;
        }

        .qdmij8-pillar-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 40px;
            margin-top: 48px;
        }

        .qdmij8-pillar-card {
            background: var(--qdmij8-card-bg);
            padding: 40px;
            border-radius: 20px;
            border: 1px solid rgba(255, 255, 255, 0.03);
            min-width: 0;
            word-break: break-word;
        }

        .qdmij8-pillar-title {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--qdmij8-primary);
        }

        .qdmij8-pillar-desc {
            font-size: 16px;
            color: var(--qdmij8-text-dim);
            margin-bottom: 24px;
        }

        .qdmij8-tag-group {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .qdmij8-tag {
            background: rgba(255, 255, 255, 0.05);
            padding: 4px 12px;
            border-radius: 100px;
            font-size: 12px;
            color: var(--qdmij8-accent);
        }

        /* 安全背书区 */
        .qdmij8-security {
            padding: 96px 0;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            flex-direction: row-reverse;
        }

        .qdmij8-security-content {
            flex: 1;
            min-width: 320px;
        }

        .qdmij8-security-img-box {
            flex: 1;
            min-width: 320px;
        }

        .qdmij8-security-img {
            width: 100%;
            max-width: 500px;
            border-radius: 16px;
            filter: grayscale(0.2) contrast(1.1);
        }

        /* 页脚 */
        .qdmij8-footer {
            padding: 80px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            background: #050505;
        }

        .qdmij8-footer-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .qdmij8-footer-brand {
            flex: 1;
            min-width: 200px;
        }

        .qdmij8-brand-text {
            font-size: 24px;
            font-weight: 800;
            letter-spacing: -1px;
            margin-bottom: 16px;
        }

        .qdmij8-footer-links {
            flex: 2;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 32px;
            min-width: 0;
        }

        .qdmij8-footer-col h4 {
            margin-bottom: 20px;
            color: white;
            font-size: 16px;
        }

        .qdmij8-footer-col ul {
            list-style: none;
        }

        .qdmij8-footer-col li {
            margin-bottom: 12px;
        }

        .qdmij8-footer-col a {
            color: var(--qdmij8-text-dim);
            text-decoration: none;
            transition: color 0.3s;
            font-size: 14px;
        }

        .qdmij8-footer-col a:hover {
            color: var(--qdmij8-primary);
        }

        @media (max-width: 768px) {
            .qdmij8-menu {
                display: none; /* 简化移动端，实际可添加汉堡菜单 */
            }
            .qdmij8-hero {
                padding-top: 120px;
                text-align: center;
            }
            .qdmij8-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .qdmij8-download-grid {
                grid-template-columns: 1fr;
            }
        }