* { margin:0; padding:0; box-sizing:border-box; }
        body {
            font-family: -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: #f5f8fe;
            color: #1a2634;
            line-height: 1.7;
        }
        .container { max-width: 80%; margin:0 auto; padding:0 24px; }
        a { text-decoration:none; color:inherit; }
        img { display:block; max-width:100%; }

        .btn {
            display: inline-block;
            padding: 12px 34px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: 0.25s;
        }
        .btn-primary {
            background: #2563eb;
            color: #fff;
            box-shadow: 0 4px 16px rgba(37,99,235,0.2);
        }
        .btn-primary:hover { background: #1d4ed8; transform: translateY(-2px); }
        .btn-outline {
            background: transparent;
            color: #2563eb;
            border: 2px solid #2563eb;
        }
        .btn-outline:hover { background: #2563eb; color:#fff; }
        .btn-sm {
            padding: 8px 22px;
            font-size: 0.85rem;
        }

        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            color: #0a1929;
            margin-bottom: 8px;
        }
        .section-sub {
            color: #5a6e87;
            font-size: 1.05rem;
        }
        .text-center { text-align: center; }

        /* ===== 导航 ===== */

        /* ===== 区块1：Hero下载页 ===== */
        .download-hero {
            padding: 70px 0 60px;
            background: linear-gradient(135deg, #f0f6ff 0%, #ffffff 50%, #f8faff 100%);
            position: relative;
            overflow: hidden;
        }
        .download-hero::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: rgba(37, 99, 235, 0.03);
            pointer-events: none;
        }
        .download-hero-grid {
            display: flex;
            align-items: center;
            gap: 60px;
            flex-wrap: wrap;
            position: relative;
            z-index: 2;
        }
        .download-hero-left { flex: 1.1; min-width: 320px; }
        .download-hero-right { flex: 1; min-width: 300px; display: flex; justify-content: flex-end; }

        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-16px); }
        }
        .download-hero-image {
            animation: float 4s ease-in-out infinite;
            border-radius: 20px;
            box-shadow: 0 12px 48px rgba(0,0,0,0.06);
            background: #ffffff;
            border: 1px solid #e9edf4;
            padding: 10px;
            transition: 0.3s;
            width: 100%;
            max-width: 650px;
        }
        .download-hero-image:hover {
            box-shadow: 0 20px 60px rgba(37,99,235,0.08);
            border-color: #2563eb;
        }
        .download-hero-image img {
            border-radius: 14px;
            width: 100%;
            height: auto;
            display: block;
        }

        .download-hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.08;
            color: #0a1929;
            margin-bottom: 12px;
        }
        .download-hero h1 .hl { color: #2563eb; }
        .download-hero p {
            color: #475569;
            font-size: 1.08rem;
            max-width: 500px;
            margin-bottom: 24px;
            line-height: 1.8;
        }
        .download-version-badge {
            display: inline-block;
            background: rgba(37, 99, 235, 0.08);
            border: 1px solid rgba(37, 99, 235, 0.10);
            border-radius: 40px;
            padding: 4px 20px;
            font-size: 0.75rem;
            font-weight: 600;
            color: #2563eb;
            letter-spacing: 0.3px;
            margin-bottom: 14px;
        }

        /* ===== 区块2：下载卡片 ===== */
        .download-section {
            padding: 60px 0 70px;
            background: #ffffff;
        }
        .download-grid {
            display: grid;
            grid-template-columns: repeat(4,1fr);
            gap: 24px;
            margin-top: 36px;
        }
        .download-card {
            background: #f8faff;
            border-radius: 20px;
            padding: 32px 20px 28px;
            text-align: center;
            border: 1px solid #eef2f8;
            transition: 0.3s;
        }
        .download-card:hover { border-color: #2563eb; transform: translateY(-6px); box-shadow: 0 12px 32px rgba(37,99,235,0.04); }
        .download-card .os-icon { font-size: 2.8rem; color: #2563eb; display:block; margin-bottom:8px; }
        .download-card h3 { font-size:1.15rem; font-weight:700; }
        .download-card .version { font-size:0.7rem; color:#8896a8; }
        .download-card .desc { font-size:0.85rem; color:#475569; margin:8px 0 14px; min-height:36px; }
        .download-card .badge {
            background: #e8edf5;
            font-size:0.6rem;
            font-weight:600;
            color:#334155;
            padding:2px 16px;
            border-radius:30px;
            display:inline-block;
            margin-bottom:6px;
        }
        .dl-btn {
            display:inline-block;
            background:#2563eb;
            color:#fff;
            padding:10px 28px;
            border-radius:40px;
            font-weight:600;
            font-size:0.85rem;
            transition:0.25s;
        }
        .dl-btn:hover { background:#1d4ed8; transform:translateY(-2px); }

        /* ===== 区块3：版本特性 ===== */
        .features-download {
            padding: 70px 0;
            background: #f8faff;
        }
        .features-download-grid {
            display: grid;
            grid-template-columns: repeat(3,1fr);
            gap: 30px;
            margin-top: 36px;
        }
        .feature-dl-card {
            background: #ffffff;
            border-radius: 20px;
            padding: 30px 26px;
            border: 1px solid #eef2f8;
            transition: 0.3s;
            text-align: center;
        }
        .feature-dl-card:hover { border-color: #2563eb; transform: translateY(-4px); box-shadow: 0 12px 32px rgba(37,99,235,0.04); }
        .feature-dl-card .icon { font-size: 2.2rem; color: #2563eb; display:block; margin-bottom:10px; }
        .feature-dl-card h3 { font-size:1.1rem; font-weight:700; }
        .feature-dl-card p { color:#475569; font-size:0.9rem; margin-top:4px; }

        /* ===== 区块4：安装指南 ===== */
        .guide {
            padding: 70px 0;
            background: #ffffff;
        }
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(4,1fr);
            gap: 24px;
            margin-top: 36px;
        }
        .guide-step {
            text-align: center;
            padding: 24px 16px;
            background: #f8faff;
            border-radius: 18px;
            border: 1px solid #eef2f8;
            transition: 0.3s;
            position: relative;
        }
        .guide-step:hover { border-color: #2563eb; transform: translateY(-4px); }
        .guide-step .num {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: #2563eb;
            color: #fff;
            font-size: 1.2rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 12px;
        }
        .guide-step h3 { font-size:1rem; font-weight:700; }
        .guide-step p { color:#475569; font-size:0.85rem; margin-top:4px; }

        /* ===== 区块5：系统要求 ===== */
        .system-requirements {
            padding: 70px 0;
            background: #f8faff;
        }
        .system-grid {
            display: grid;
            grid-template-columns: repeat(2,1fr);
            gap: 30px;
            margin-top: 36px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }
        .system-requirements { scroll-margin-top:96px; }
        .system-note { max-width:800px; margin:24px auto 0; color:#5a6e87; font-size:0.9rem; text-align:center; }
        .system-card {
            background: #ffffff;
            border-radius: 18px;
            padding: 28px 26px;
            border: 1px solid #eef2f8;
            transition: 0.3s;
        }
        .system-card:hover { border-color: #2563eb; transform: translateY(-4px); }
        .system-card .icon { font-size: 2rem; color: #2563eb; display:block; margin-bottom:8px; }
        .system-card h3 { font-size:1.1rem; font-weight:700; }
        .system-card ul { list-style:none; margin-top:8px; }
        .system-card ul li { padding:4px 0; font-size:0.9rem; color:#475569; display:flex; align-items:center; gap:8px; }
        .system-card ul li i { color:#2563eb; width:18px; font-size:0.8rem; }

        /* ===== 区块6：更新日志 ===== */
        .changelog {
            padding: 70px 0;
            background: #ffffff;
        }
        .changelog-list {
            max-width: 800px;
            margin: 32px auto 0;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .changelog-item {
            background: #f8faff;
            border-radius: 16px;
            padding: 18px 24px;
            border: 1px solid #eef2f8;
            transition: 0.2s;
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }
        .changelog-item:hover { border-color: #2563eb; }
        .changelog-item .version-tag {
            background: #2563eb;
            color: #fff;
            padding: 2px 14px;
            border-radius: 30px;
            font-size: 0.7rem;
            font-weight: 600;
            flex-shrink: 0;
            margin-top: 2px;
        }
        .changelog-item .content h3 { font-size:1rem; font-weight:600; }
        .changelog-item .content p { color:#475569; font-size:0.88rem; margin-top:2px; }
        .changelog-item .content .date { color:#8896a8; font-size:0.75rem; }

        /* ===== 区块7：常见问题（下载页专用） ===== */
        .faq-download {
            padding: 70px 0;
            background: #f8faff;
        }
        .faq-download-list {
            max-width: 860px;
            margin: 32px auto 0;
            display:flex;
            flex-direction:column;
            gap: 10px;
        }
        .faq-download-item {
            border: 1px solid #eef2f8;
            border-radius: 16px;
            padding: 16px 24px;
            background: #ffffff;
            transition: 0.2s;
        }
        .faq-download-item:hover { border-color: #2563eb; background: #fafcff; }
        .faq-download-item .q { font-weight:600; display:flex; align-items:center; gap:10px; font-size:0.98rem; }
        .faq-download-item .q i { color:#2563eb; font-size:0.8rem; }
        .faq-download-item .a { padding-left:28px; color:#475569; font-size:0.93rem; margin-top:4px; line-height:1.8; }

        main .container { width:100%; max-width:1200px; }
        #download-cards, #guide { scroll-margin-top:96px; }
        @media (prefers-reduced-motion:reduce) {
            .download-hero-image { animation:none; }
            main .btn, main .download-card, main .dl-btn { transition:none; }
        }

        /* ===== 底部 ===== */

        /* ===== 响应式 ===== */
        @media (max-width:1200px) {
            .container { max-width: 90%; }
        }
        @media (max-width:992px) {
            .container { max-width: 95%; }
            .download-hero h1 { font-size:2.6rem; }
            .download-grid { grid-template-columns:1fr 1fr; }
            .features-download-grid { grid-template-columns:1fr 1fr; }
            .guide-grid { grid-template-columns:1fr 1fr; }
            .footer-grid { grid-template-columns:1fr 1fr; }


        }
        @media (max-width:768px) {
            .system-grid { grid-template-columns:1fr; }
            .container { max-width: 100%; padding:0 16px; }
            .download-hero-grid { flex-direction:column; text-align:center; }
            .download-hero p { margin:0 auto; }
            .download-hero-left { min-width:unset; }
            .download-hero-right { min-width:unset; justify-content:center; }
            .download-hero::before { display:none; }
            .nav-links { gap:4px 12px; }
            .nav-links a { font-size:0.82rem; }
            .download-grid { grid-template-columns:1fr; }
            .features-download-grid { grid-template-columns:1fr; }
            .guide-grid { grid-template-columns:1fr; }
            .footer-grid { grid-template-columns:1fr; text-align:center; }
            .footer .brand p { max-width:100%; }
            .footer-bottom { flex-direction:column; text-align:center; gap:6px; }
            .section-title { font-size:1.8rem; }
            .changelog-item { flex-direction:column; gap:8px; }
            .download-hero-image { max-width:100%; }



        }
        @media (max-width:480px) {
            .download-hero h1 { font-size:2rem; }
            .container { padding:0 12px; }
        }