/* 品牌色彩系统 */
        :root {
            --primary-bg: #ffffff;
            --secondary-bg: #f3f8fc; /* 温润的云朵淡蓝 */
            --text-main: #000000; 
            --text-muted: #51525d; 
            --gradient-brand: linear-gradient(90deg, #FF00A0 0%, #8A2BE2 50%, #00BFFF 100%);
            --border-color: rgba(0, 0, 0, 0.08);
            --card-shadow: 0 10px 40px rgba(0, 0, 0, 0.02);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;
            background: linear-gradient(180deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
            color: var(--text-main);
            line-height: 1.5;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
        }

        .text-gradient {
            background: var(--gradient-brand);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* --- 顶部导航栏 --- */
        header {
            width: 100%;
            max-width: 1400px;
            margin: 0 auto;
            padding: 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 14px;
        }

        .logo {
            font-size: 2.5rem;
            font-weight: 900;
            letter-spacing: 1.5px;
            text-decoration: none;
        }

        .logo-divider {
            width: 1px;
            height: 20px;
            background-color: rgba(0, 0, 0, 0.15);
        }

        .logo-slogan {
            font-size: 0.9rem;
            color: var(--text-muted);
            letter-spacing: 0.5px;
            font-weight: 500;
	    line-height:20px;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 2.5rem;
        }

        .nav-link {
            text-decoration: none;
            color: var(--text-main);
            font-size: 1rem;
            font-weight: 500;
            transition: color 0.2s ease;
        }

        .nav-link:hover {
            color: #8A2BE2;
        }

        .login-btn {
            background: #000000;
            color: #ffffff;
            text-decoration: none;
            padding: 0.65rem 1.8rem;
            border-radius: 2rem;
            font-size: 0.95rem;
            font-weight: 600;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .login-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        }

        /* --- 大幅面 Hero 展示区 --- */
        .hero {
            text-align: center;
            padding: 8rem 2rem 5rem; /* 保持大气下移间距 */
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        /* 核心修改：双阶主Flag排版 */
        .hero h1 {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 1.5rem;
            margin-bottom: 2.5rem;
        }

        .flag-primary {
            font-size: clamp(2.8rem, 5vw, 4.5rem); 
            font-weight: 850;
            line-height: 1.15;
            letter-spacing: 2px;
            color: #111111;
        }

        .flag-secondary {
            font-size: clamp(2rem, 3.6vw, 3.2rem); /* 略小于第一行，但极具分量 */
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: 2px;
            color: #333;
        }

        /* 舒展的辅助说明副标题 */
        .hero-desc {
            font-size: clamp(1.05rem, 1.4vw, 1.25rem); 
            color: var(--text-muted);
            max-width: 820px;
            line-height: 1.85;
            font-weight: 400;
            margin-bottom: 9.5rem; /* 保持与下载框的超大“黄金呼吸”间距 */
        }

        /* --- 核心：发光下载舱 --- */
        .download-console {
            background: rgba(255, 255, 255, 0.8);
            border: 2px solid transparent;
            background-image: linear-gradient(white, white), var(--gradient-brand);
            background-origin: border-box;
            background-clip: padding-box, border-box;
            
            padding: 1.5rem;
            border-radius: 50px; 
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 1rem;
            flex-wrap: wrap;
            max-width: 1050px;
            width: 100%;
            box-shadow: 0 20px 60px rgba(138, 43, 226, 0.15), 
                        0 5px 15px rgba(0, 191, 255, 0.1);
            margin-bottom: 8rem; 
        }

        /* 单个下载按钮 */
        .download-btn {
            background: #000000;
            color: #ffffff;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 0.8rem 1.6rem;
            border-radius: 35px;
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
            border: 1px solid rgba(255, 255, 255, 0.1);
            min-width: 175px;
            text-align: left;
        }

        .download-btn:hover {
            background: #1f1f24;
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
        }

        .download-btn svg {
            width: 22px;
            height: 22px;
            fill: currentColor;
            flex-shrink: 0;
        }

        .btn-text {
            display: flex;
            flex-direction: column;
        }

        .btn-action {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: rgba(255, 255, 255, 0.6);
        }

        .btn-platform {
            font-size: 0.95rem;
            font-weight: 700;
            line-height: 1.2;
        }

        /* --- 极简一列纵向布局 (长条交错版面) --- */
        .grid-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem 8rem;
            display: flex;
            flex-direction: column; 
            gap: 2.2rem; 
        }

        /* 基础长条卡片 */
        .block-card {
            background: rgba(255, 255, 255, 0.8);
            border: 1px solid var(--border-color);
            border-radius: 28px;
            padding: 3.5rem 4.5rem;
            box-shadow: var(--card-shadow);
            backdrop-filter: blur(20px);
            transition: all 0.3s ease;
            width: 100%;
            display: flex;
        }

        .block-card:hover {
            transform: translateY(-4px);
            border-color: rgba(138, 43, 226, 0.25);
            box-shadow: 0 15px 45px rgba(138, 43, 226, 0.06);
        }

        /* 长条中的文字包装器：限制宽度为 55% 创造高级留白 */
        .card-inner {
            max-width: 55%; 
            width: 100%;
        }

        /* 顶级大长条：超级记忆（居中对齐） */
        .super-memory-block {
            background: linear-gradient(180deg, #ffffff 0%, rgba(240, 246, 252, 0.6) 100%);
            border: 1px solid rgba(138, 43, 226, 0.18);
            justify-content: center;
            text-align: center;
            padding: 5rem 3rem;
        }

        .super-memory-block .card-inner {
            max-width: 80%;
        }

        /* 交错排版：奇数长条左对齐 */
        .align-left {
            justify-content: flex-start;
        }
        .align-left .card-inner {
            text-align: left;
        }

        /* 交错排版：偶数长条右对齐 */
        .align-right {
            justify-content: flex-end;
        }
        .align-right .card-inner {
            text-align: right;
        }

        .block-title {
            font-size: 1.8rem;
            font-weight: 800;
            color: #000000;
            margin-bottom: 1.2rem;
            letter-spacing: -0.5px;
        }

        .super-memory-block .block-title {
            font-size: 2.4rem;
        }

        .block-desc {
            font-size: 1.1rem;
            color: var(--text-muted);
            line-height: 1.85;
        }

        /* --- 紧凑版：七曜谷企业级页脚 CSS (已优化协议链接与绝对等间距) --- */
        footer {
            background: rgba(255, 255, 255, 0.6);
            border-top: 1px solid var(--border-color);
            padding: 2.2rem 2rem 3rem 2rem; /* 缩小上下内边距 */
            backdrop-filter: blur(20px);
            line-height: 1.3; /* 压缩文字本身的行高 */
        }

        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            align-items: center;
            /* 🎯 核心控制：控制【第一行(品牌)】、【第二行(版权/协议)】、【第三行(ICP备案)】三行之间绝对均等的行间距 */
            gap: 0.5rem; 
            text-align: center;
        }

        /* 第一行：产品与公司的母子关系 */
        .footer-brand {
            font-size: 0.9rem;
            color: var(--text-main);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .footer-brand span {
            color: var(--text-muted);
            font-weight: 400;
        }

        .footer-brand-highlight {
            color: #8A2BE2; 
            font-weight: 700;
        }

        /* 第二行：🎯 版权声明与协议链接（横向排版与间距控制） */
        .footer-copyright {
            font-size: 0.8rem;
            color: #8a8a93;
            margin: 0; /* 🎯 彻底清除原本的 margin-top，确保与上下两行的 gap 间距完全等高 */
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 16px; /* 🎯 设定“版权/邮箱”与“用户协议”与“隐私政策”之间的横向拉伸间距 */
        }

        /* 第二行内：🎯 优雅美化协议链接（干掉丑陋的默认下划线） */
        .footer-copyright span a {
            color: #8a8a93;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.2s ease;
        }

        .footer-copyright span a:hover {
            color: #8A2BE2; /* 悬浮时亮起品牌紫色 */
            text-decoration: underline; /* 悬浮时显现下划线 */
        }

        /* 第三行：备案及企业链接 */
        .footer-meta {
            display: flex;
            align-items: center;
            gap: 0.3rem 1rem; /* 缩小链接之间的间距 */
            flex-wrap: wrap;
            justify-content: center;
            font-size: 0.82rem;
            color: var(--text-muted);
        }

        .footer-link {
            color: var(--text-muted);
            text-decoration: none;
            transition: color 0.2s ease;
            font-weight: 500;
        }

        .footer-link:hover {
            color: #8A2BE2;
        }

        .footer-divider {
            width: 1px;
            height: 10px; /* 略微缩短分割线 */
            background-color: rgba(0, 0, 0, 0.1);
        }

        /* 移动端页脚自适应 */
        @media (max-width: 768px) {
            .footer-meta {
                flex-direction: column;
                gap: 0.4rem;
            }
            .footer-divider {
                display: none;
            }
            /* 移动端下防挤压，自动调整协议行的纵横间距 */
            .footer-copyright {
                gap: 8px 12px;
            }
        }



        /* 响应式调整 */
        @media (max-width: 1024px) {
            .download-console {
                border-radius: 24px;
                padding: 1.5rem;
            }
            .download-btn {
                flex: 1 1 40%;
            }
            .card-inner {
                max-width: 100%; 
            }
        }

        @media (max-width: 768px) {
            header {
                flex-direction: column;
                gap: 1.5rem;
                padding: 1.5rem 1rem;
            }
            .logo-area {
                flex-direction: column;
                gap: 6px;
            }
            .logo-divider {
                display: none;
            }
            .block-card {
                padding: 2.5rem 2rem;
                justify-content: center !important;
            }
            .card-inner {
                text-align: center !important;
                max-width: 100%;
            }
            .download-console {
                border-radius: 20px;
                gap: 0.8rem;
                margin-bottom: 5rem;
            }
            .download-btn {
                flex: 1 1 100%;
            }
        }