/* ========== 全局重置与变量 ========== */
        :root {
            --primary-red: #ef443b;
            --text-main: #1f2937;
            --gradient-start: #ef443b;
            --gradient-end: #EE8D3B;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Noto Sans', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-display: swap;
        }
        body {
            color: var(--text-main);
            background: #ffffff;
            line-height: 1.5;
            overflow-x: hidden;
        }

        /* ========== 导航栏（与修改后首页完全一致） ========== */
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 8%;
            height: 80px;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            background: radial-gradient(circle at 10% 20%, rgba(239, 68, 68, 0.03) 0%, rgba(255, 255, 255, 1) 50%);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid #f3f4f6;
        }
        .nav-left { display: flex; align-items: center; }
        .logo { margin-right: 40px; }
        .logo img { height: 30px; width: 158px; }
        .nav-links { display: flex; list-style: none; }
        .nav-links li { display: flex; align-items: center; gap: 4px; margin: 0 15px; border-bottom: 3px solid transparent; }
        .nav-links li:hover { border-bottom: 3px solid #FFD5D6; }
        .nav-links a { text-decoration: none; color: var(--text-main); font-size: 15px; font-weight: 500; }
        .nav-links-svg { width: 12px; height: 12px; }
        .nav-right { display: flex; align-items: center; }
        .btn-link {
            text-decoration: none; color: var(--primary-red); padding: 10px 24px;
            border: 2px solid var(--primary-red); border-radius: 6px; font-weight: 600;
            font-size: 14px; margin-left: 12px; transition: 0.3s;
        }
        .btn-link:hover { background: var(--primary-red); color: #fff; }
        .btn-outline {
            text-decoration: none; color: #fff; background: var(--primary-red);
            padding: 11px 24px; border-radius: 6px; font-weight: 600; font-size: 14px; transition: 0.3s;
        }
        .btn-outline:hover { background: #d93833; }

        /* ========== 下载首屏 ========== */
        .dl-hero {
            padding: 180px 8% 80px;
            background: radial-gradient(circle at 90% 10%, rgba(239, 68, 68, 0.05) 0%, rgba(255, 255, 255, 1) 50%);
            text-align: center;
        }
        .dl-hero h1 {
            font-size: 3.6rem;
            font-weight: 800;
            background: linear-gradient(135deg, #ef443b, #EE8D3B);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 18px;
        }
        .dl-hero p {
            font-size: 1.2rem;
            max-width: 760px;
            margin: 0 auto 40px;
            color: #4b5563;
            line-height: 1.6;
        }
        .main-dl-card {
            background: #fff;
            border-radius: 28px;
            padding: 40px 48px;
            display: inline-flex;
            align-items: center;
            gap: 50px;
            flex-wrap: wrap;
            justify-content: center;
            box-shadow: 0 25px 45px -12px rgba(0,0,0,0.1);
            border: 1px solid #f0f0f0;
            margin-bottom: 24px;
        }
        .os-info { text-align: left; }
        .os-badge { display: flex; align-items: center; gap: 10px; color: var(--primary-red); font-weight: 700; margin-bottom: 12px; }
        .os-badge img { width: 32px; }
        .os-info h3 { font-size: 1.9rem; font-weight: 700; margin-bottom: 6px; }
        .btn-dl-large {
            background: var(--primary-red); color: #fff; padding: 16px 48px;
            border-radius: 50px; text-decoration: none; font-weight: 800;
            font-size: 1.2rem; box-shadow: 0 10px 25px rgba(239,68,68,0.3);
            transition: 0.2s;
        }
        .btn-dl-large:hover { transform: translateY(-3px); background: #d93833; }
        .alt-links { margin-top: 15px; font-size: 0.95rem; }
        .alt-links a { color: var(--primary-red); text-decoration: none; margin: 0 8px; font-weight: 500; }

        /* 平台网格 */
        .platform-grid {
            padding: 60px 8%;
            background: #fcfcfc;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 30px;
        }
        .platform-card {
            background: #fff; padding: 30px 20px; border-radius: 24px;
            text-align: center; transition: 0.3s; border: 1px solid #eee;
        }
        .platform-card:hover { border-color: var(--primary-red); transform: translateY(-6px); box-shadow: 0 20px 30px rgba(0,0,0,0.03); }
        .platform-card img { width: 52px; margin-bottom: 20px; }
        .platform-card h4 { font-size: 1.6rem; font-weight: 700; margin-bottom: 12px; }
        .platform-card p { color: #5a6a85; margin-bottom: 20px; font-size: 0.9rem; }
        .platform-card a { color: var(--primary-red); font-weight: 600; text-decoration: none; border-bottom: 1px solid transparent; }
        .platform-card a:hover { border-bottom-color: var(--primary-red); }

        /* 创意教程版块 — 简易安装指引 */
        .install-guide {
            padding: 80px 8%;
            background: white;
            text-align: center;
        }
        .section-header h2 {
            font-size: 2.6rem; font-weight: 700; margin-bottom: 20px;
            background: linear-gradient(135deg, #1f2937, #ef443b); -webkit-background-clip: text; background-clip: text; color: transparent;
        }
        .steps-grid {
            display: flex; gap: 30px; justify-content: center; flex-wrap: wrap;
            margin-top: 50px;
        }
        .step-card {
            background: #fef9f9; border-radius: 28px; padding: 32px 24px;
            flex: 1 1 220px; max-width: 260px; transition: 0.2s;
        }
        .step-number {
            width: 56px; height: 56px; background: var(--primary-red); color: white;
            font-size: 1.8rem; font-weight: 800; border-radius: 30px;
            display: flex; align-items: center; justify-content: center; margin: 0 auto 20px;
        }
        .step-card h3 { font-size: 1.4rem; margin-bottom: 12px; }
        .step-card p { color: #4b5563; font-size: 0.9rem; line-height: 1.6; }

        /* 企业版 + 网页版联动 */
        .hybrid-section {
            background: linear-gradient(120deg, #ef443b08, #fff8f0);
            padding: 80px 8%;
            display: flex;
            flex-wrap: wrap;
            gap: 60px;
            align-items: center;
        }
        .hybrid-text { flex: 1; }
        .hybrid-text h3 { font-size: 2.2rem; font-weight: 700; color: var(--primary-red); margin-bottom: 20px; }
        .hybrid-text p { margin-bottom: 20px; font-size: 1.05rem; line-height: 1.6; color: #2c3e4e; }
        .hybrid-badge { background: #ef443b10; padding: 12px 24px; border-radius: 60px; display: inline-block; font-weight: 600; margin-top: 10px; }
        .hybrid-img { flex: 1; text-align: center; }
        .hybrid-img img { max-width: 100%; width: 320px; border-radius: 28px; background: #f3f4f6; padding: 12px; }

        /* 版本选择 */
        .edition-section {
            padding: 80px 8%;
            background: #f9fafb;
            text-align: center;
        }
        .edition-cards {
            display: flex; gap: 30px; justify-content: center; flex-wrap: wrap;
            margin: 50px 0 20px;
        }
        .edition-card {
            background: white; border-radius: 32px; padding: 40px 28px;
            flex: 1 1 280px; max-width: 360px; text-align: left;
            border: 1px solid #eee; transition: 0.2s;
        }
        .edition-card:hover { border-color: var(--primary-red); transform: translateY(-5px); }
        .edition-card h4 { font-size: 1.9rem; font-weight: 700; margin-bottom: 15px; color: #111; }
        .price-tag { font-size: 1.8rem; font-weight: 800; color: var(--primary-red); margin: 15px 0; }
        .edition-card ul { list-style: none; margin: 20px 0; }
        .edition-card li { padding: 8px 0; display: flex; align-items: center; gap: 10px; }
        .btn-edition {
            display: inline-block; background: var(--primary-red); color: white;
            padding: 12px 0; width: 100%; text-align: center; border-radius: 40px;
            text-decoration: none; font-weight: 700; margin-top: 15px;
        }
        .btn-edition-outline { background: transparent; border: 2px solid var(--primary-red); color: var(--primary-red); }
        .footnote-safe {
            background: #eef2ff10; border-left: 4px solid var(--primary-red);
            margin: 20px auto 0; max-width: 800px; padding: 16px; border-radius: 20px;
            font-size: 0.9rem; color: #2d3e50;
        }

        /* ========== 页脚（与修改后首页完全一致） ========== */
        footer {
            background: #111111;
            color: #ffffff;
            padding: 80px 8% 40px;
            font-family: 'Noto Sans', sans-serif;
        }
        .footer-container {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
            gap: 40px;
        }
        .footer-logo-section img {
            height: 35px;
            margin-bottom: 20px;
        }
        .footer-logo-section p {
            color: #999;
            font-size: 14px;
            margin-bottom: 10px;
        }
        .footer-column h3 {
            color: var(--primary-red);
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 15px;
        }
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 1px;
            background: #333;
        }
        .footer-column ul {
            list-style: none;
        }
        .footer-column ul li {
            margin-bottom: 12px;
        }
        .footer-column ul li a {
            color: #cccccc;
            text-decoration: none;
            font-size: 14px;
            transition: 0.3s;
        }
        .footer-column ul li a:hover {
            color: var(--primary-red);
        }
        .footer-bottom {
            margin-top: 60px;
            padding-top: 30px;
            border-top: 1px solid #222;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
            color: #666;
        }
        .footer-socials {
            display: flex;
            gap: 20px;
        }
        .footer-socials a {
            color: #666;
            text-decoration: none;
            transition: 0.3s;
        }
        .footer-socials a:hover {
            color: #fff;
        }

        @media (max-width: 1024px) {
            .footer-container {
                grid-template-columns: 1fr 1fr;
            }
            .footer-logo-section {
                grid-column: span 2;
                text-align: center;
                margin-bottom: 40px;
            }
            .main-dl-card { flex-direction: column; text-align: center; padding: 30px; }
            .os-info { text-align: center; }
        }
        @media (max-width: 768px) {
            .dl-hero h1 { font-size: 2.3rem; }
            .section-header h2 { font-size: 1.9rem; }
            .hybrid-text h3 { font-size: 1.8rem; }
        }