:root {
            --primary: #1d4ed8;
            --primary-dark: #1e40af;
            --primary-light: #eff6ff;
            --gray-50: #f8fafc;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-400: #9ca3af;
            --gray-500: #6b7280;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;
            --white: #ffffff;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.06);
            --shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.07);
            --radius-md: 8px;
            --radius-lg: 12px;
            --transition: all 0.2s ease;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: var(--gray-800);
            background: var(--white);
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        .container {
            width: 100%;
            max-width: 1560px;
            margin: 0 auto;
            padding: 0 40px;
        }

        /* 导航 */
        .header {
            background: var(--white);
            border-bottom: 1px solid var(--gray-100);
            height: 64px;
            display: flex;
            align-items: center;
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            color: var(--gray-900);
            font-weight: 700;
            font-size: 17px;
            letter-spacing: -0.2px;
        }
        .logo img {
            height: 32px;
            width: auto;
        }
        .header-nav {
            display: flex;
            gap: 24px;
        }
        .header-nav a {
            color: var(--gray-500);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: var(--transition);
        }
        .header-nav a:hover { color: var(--gray-900); }

        /* 通用板块 */
        .section {
            padding: 72px 0;
        }
        .section-gray {
            background: var(--gray-50);
        }
        .section-label {
            display: inline-block;
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 1.2px;
            text-transform: uppercase;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .section-title {
            font-size: 28px;
            font-weight: 800;
            color: var(--gray-900);
            letter-spacing: -0.5px;
            margin-bottom: 10px;
        }
        .section-subtitle {
            font-size: 15px;
            color: var(--gray-500);
            max-width: 560px;
            line-height: 1.6;
        }
        .section-header {
            margin-bottom: 44px;
        }
        .section-header-center {
            text-align: center;
        }
        .section-subtitle-center {
            margin: 0 auto;
        }

        /* 下载区 */
        .download-section {
            padding: 48px 0 56px;
            text-align: center;
        }
        .download-section .section-label {
            margin-bottom: 20px;
        }
        .download-section h1 {
            font-size: 36px;
            font-weight: 800;
            color: var(--gray-900);
            letter-spacing: -0.8px;
            margin-bottom: 10px;
        }
        .download-section .section-subtitle {
            margin: 0 auto 56px;
        }
        .version-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            max-width: 900px;
            margin: 0 auto 24px;
        }
        .version-card {
            background: var(--white);
            border: 1px solid var(--gray-200);
            border-radius: var(--radius-md);
            padding: 20px 16px;
            text-align: center;
        }
        .version-card .vc-icon {
            font-size: 28px;
            color: var(--gray-700);
            margin-bottom: 8px;
        }
        .version-card .vc-name {
            font-size: 13px;
            font-weight: 600;
            color: var(--gray-900);
            margin-bottom: 12px;
        }
        .version-card .btn-download-sm {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            background: var(--primary);
            color: var(--white);
            border-radius: var(--radius-md);
            text-decoration: none;
            font-weight: 600;
            font-size: 13px;
            transition: var(--transition);
        }
        .version-card .btn-download-sm:hover {
            background: var(--primary-dark);
        }
        .download-meta {
            font-size: 13px;
            color: var(--gray-400);
            margin-bottom: 4px;
        }
        .download-source {
            font-size: 13px;
            color: #059669;
            font-weight: 500;
        }
        .download-source i { margin-right: 4px; font-size: 11px; }

        /* 发行说明 */
        .release-notes {
            max-width: 700px;
            margin: 32px auto 0;
            text-align: left;
            background: var(--white);
            border: 1px solid var(--gray-100);
            border-radius: var(--radius-md);
            padding: 20px 24px;
        }
        .release-notes h3 {
            font-size: 14px;
            font-weight: 700;
            color: var(--gray-900);
            margin-bottom: 10px;
        }
        .release-notes .rn-label {
            font-size: 13px;
            font-weight: 400;
            color: var(--primary);
            margin-top: 8px;
            margin-bottom: 2px;
        }
        .release-notes .rn-item {
            font-size: 13px;
            color: var(--gray-500);
            line-height: 1.6;
            padding: 2px 0;
        }

        /* FAQ */
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }
        .faq-item {
            background: var(--white);
            border: 1px solid var(--gray-100);
            border-radius: var(--radius-md);
            padding: 18px 20px;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--gray-200);
            box-shadow: var(--shadow-sm);
        }
        .faq-item .faq-q {
            font-size: 14px;
            font-weight: 600;
            color: var(--gray-900);
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .faq-item .faq-a {
            font-size: 13px;
            color: var(--gray-500);
            line-height: 1.6;
        }
        .support-bar {
            margin-top: 32px;
            text-align: center;
            padding: 18px 24px;
            background: var(--white);
            border: 1px solid var(--gray-100);
            border-radius: var(--radius-md);
            font-size: 14px;
            color: var(--gray-600);
        }
        .support-phone {
            color: var(--primary);
            font-weight: 600;
            text-decoration: none;
            margin: 0 4px;
        }

        /* 场景引导区 */
        .explore-row {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 20px;
        }
        .product-card {
            background: var(--white);
            border: 1px solid var(--gray-100);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }
        .product-items {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            flex: 1;
        }
        .product-item {
            display: flex;
            flex-direction: column;
        }
        .product-item .pi-icon {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 16px;
            margin-bottom: 12px;
        }
        .product-item h3 {
            font-size: 15px;
            font-weight: 700;
            color: var(--gray-900);
            margin-bottom: 4px;
        }
        .product-item p {
            font-size: 13px;
            color: var(--gray-500);
            line-height: 1.5;
            margin-bottom: 10px;
            flex: 1;
        }
        .product-item .pi-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            text-decoration: none;
        }
        .product-item .pi-link:hover { gap: 6px; }

        .solution-card {
            background: var(--white);
            border: 1px solid var(--gray-100);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .solution-card .sc-icon {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 16px;
            margin-bottom: 16px;
        }
        .solution-card h3 {
            font-size: 15px;
            font-weight: 700;
            color: var(--gray-900);
            margin-bottom: 8px;
        }
        .solution-card p {
            font-size: 13px;
            color: var(--gray-500);
            line-height: 1.6;
            margin-bottom: 14px;
        }
        .solution-card .sc-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            text-decoration: none;
        }
        .solution-card .sc-link:hover { gap: 6px; }

        /* 底部 */
        .footer {
            background: var(--gray-900);
            text-align: center;
            padding: 36px 0;
        }
        .footer-phones {
            display: flex;
            justify-content: center;
            gap: 36px;
            flex-wrap: wrap;
            margin-bottom: 14px;
        }
        .footer-phones span {
            color: var(--gray-300);
            font-size: 14px;
        }
        .footer-phones a {
            color: var(--white);
            font-weight: 600;
            text-decoration: none;
            font-size: 16px;
        }
        .footer-copy {
            color: var(--gray-500);
            font-size: 12px;
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .version-grid { grid-template-columns: repeat(2, 1fr); }
            .faq-grid { grid-template-columns: repeat(2, 1fr); }
            .explore-row { grid-template-columns: 1fr; }
            .product-items { grid-template-columns: 1fr; }
        }
        @media (max-width: 768px) {
            .container { padding: 0 20px; }
            .section { padding: 56px 0; }
            .download-section { padding: 40px 0 44px; }
            .download-section h1 { font-size: 28px; }
            .section-title { font-size: 24px; }
            .version-grid { grid-template-columns: 1fr; max-width: 280px; }
            .faq-grid { grid-template-columns: 1fr; }
            .header-nav { display: none; }
            .footer-phones { flex-direction: column; gap: 8px; }
            .product-items { grid-template-columns: 1fr; }
            .explore-row { grid-template-columns: 1fr; }
        }