*, *::before, *::after {
            box-sizing: border-box;
        }
        body {
            margin: 0;
            padding: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: #f6f8fa;
            color: #1a202c;
            line-height: 1.65;
            letter-spacing: 0.02em;
        }
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 76px;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
            z-index: 1000;
            display: flex;
            align-items: center;
        }
        .nav-container {
            width: 100%;
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 14px;
            text-decoration: none;
        }
        .nav-logo img {
            width: 42px;
            height: 42px;
            border-radius: 10px;
            object-fit: cover;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
        }
        .nav-logo-text {
            font-size: 24px;
            font-weight: 800;
            color: #0f172a;
            letter-spacing: -0.03em;
        }
        .nav-badge {
            background-color: #f0fdf4;
            color: #16a34a;
            font-size: 11px;
            padding: 4px 10px;
            border-radius: 20px;
            font-weight: 600;
            border: 1px solid #bbf7d0;
        }
        .nav-links {
            display: flex;
            gap: 40px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links a {
            text-decoration: none;
            color: #4a5568;
            font-size: 15px;
            font-weight: 600;
            transition: all 0.2s cubic-bezier(0.4,0,0.2,1);
            position: relative;
            padding: 6px 0;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: #2563eb;
            transition: width 0.2s ease;
        }
        .nav-links a:hover::after, .nav-links a.active::after {
            width: 100%;
        }
        .nav-links a:hover, .nav-links a.active {
            color: #2563eb;
        }
        .download-header {
            padding: 160px 24px 60px 24px;
            max-width: 1320px;
            margin: 0 auto;
            text-align: center;
        }
        .download-header h1 {
            font-size: 42px;
            font-weight: 900;
            color: #0f172a;
            letter-spacing: -0.04em;
            margin: 0 0 20px 0;
        }
        .download-header p {
            font-size: 16px;
            color: #4a5568;
            max-width: 720px;
            margin: 0 auto;
        }
        .download-grid {
            max-width: 1320px;
            margin: 0 auto 80px auto;
            padding: 0 24px;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 40px;
        }
        .download-card {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            border-radius: 28px;
            padding: 44px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.01);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: all 0.25s ease;
        }
        .download-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 30px rgba(0,0,0,0.03);
            border-color: #cbd5e1;
        }
        .card-top {
            display: block;
        }
        .platform-info {
            display: flex;
            align-items: center;
            gap: 20px;
            margin-bottom: 24px;
        }
        .platform-icon {
            width: 52px;
            height: 52px;
            background: #f1f5f9;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .platform-icon svg {
            width: 28px;
            height: 28px;
            fill: #0f172a;
        }
        .platform-meta h2 {
            font-size: 22px;
            font-weight: 800;
            color: #0f172a;
            margin: 0 0 4px 0;
        }
        .platform-meta span {
            font-size: 13px;
            color: #64748b;
            font-weight: 600;
        }
        .platform-desc {
            font-size: 14px;
            color: #4a5568;
            margin: 0 0 32px 0;
            line-height: 1.6;
            text-align: justify;
        }
        .file-specs {
            background: #f8fafc;
            border-radius: 16px;
            padding: 20px;
            margin-bottom: 32px;
            border: 1px solid #edf2f7;
        }
        .spec-row {
            display: flex;
            justify-content: space-between;
            font-size: 13px;
            margin-bottom: 10px;
        }
        .spec-row:last-child {
            margin-bottom: 0;
        }
        .spec-label {
            color: #64748b;
            font-weight: 500;
        }
        .spec-value {
            color: #334155;
            font-weight: 600;
            font-family: monospace;
        }
        .btn-download {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            background-color: #0f172a;
            color: #ffffff;
            text-decoration: none;
            padding: 16px 28px;
            border-radius: 20px;
            font-weight: 700;
            font-size: 15px;
            transition: all 0.2s ease;
            text-align: center;
        }
        .btn-download:hover {
            background-color: #2563eb;
        }
        .btn-download svg {
            width: 20px;
            height: 20px;
            fill: #ffffff;
        }
        .btn-download.appstore {
            background-color: #2563eb;
        }
        .btn-download.appstore:hover {
            background-color: #1d4ed8;
        }
        .section-header {
            max-width: 800px;
            margin: 0 auto 48px auto;
            text-align: center;
        }
        .section-header h2 {
            font-size: 32px;
            font-weight: 900;
            color: #0f172a;
            letter-spacing: -0.03em;
            margin: 0 0 16px 0;
        }
        .section-header p {
            font-size: 16px;
            color: #64748b;
            margin: 0;
        }
        /* 更新日志区 */
        .changelog-section {
            max-width: 1320px;
            margin: 0 auto 80px auto;
            padding: 0 24px;
        }
        .changelog-container {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            border-radius: 32px;
            padding: 50px;
        }
        .changelog-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            margin-top: 40px;
        }
        .changelog-item {
            background: #f8fafc;
            border-radius: 20px;
            padding: 24px;
            border: 1px solid #edf2f7;
        }
        .changelog-version {
            font-weight: 800;
            font-size: 18px;
            color: #2563eb;
            margin-bottom: 8px;
        }
        .changelog-date {
            font-size: 12px;
            color: #64748b;
            margin-bottom: 12px;
            font-weight: 600;
        }
        .changelog-item p {
            font-size: 14px;
            color: #334155;
            margin: 0;
            line-height: 1.6;
        }
        /* 三步安装区 */
        .quickstart-section {
            background-color: #ffffff;
            padding: 80px 24px;
            border-top: 1px solid #e2e8f0;
            border-bottom: 1px solid #e2e8f0;
        }
        .quickstart-container {
            max-width: 1272px;
            margin: 0 auto;
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
            margin-top: 48px;
        }
        .step-card {
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            border-radius: 24px;
            padding: 40px 32px;
            text-align: center;
            transition: all 0.25s ease;
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px rgba(0,0,0,0.05);
        }
        .step-number {
            font-size: 48px;
            font-weight: 900;
            color: #e2e8f0;
            position: absolute;
            top: 20px;
            right: 24px;
            line-height: 1;
        }
        .step-icon {
            font-size: 40px;
            margin-bottom: 20px;
        }
        .step-card h4 {
            font-size: 20px;
            font-weight: 800;
            color: #0f172a;
            margin: 0 0 14px 0;
        }
        .step-card p {
            font-size: 15px;
            color: #4a5568;
            margin: 0;
            line-height: 1.7;
        }
        /* 安全校验提示 */
        .security-notice-section {
            max-width: 1320px;
            margin: 0 auto 80px auto;
            padding: 0 24px;
        }
        .notice-content {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            border-radius: 32px;
            padding: 50px;
        }
        .notice-content h3 {
            font-size: 26px;
            font-weight: 800;
            color: #0f172a;
            margin-top: 0;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }
        .notice-content p {
            font-size: 15px;
            color: #4a5568;
            line-height: 1.7;
            margin: 0 0 16px 0;
            text-align: justify;
        }
        .notice-content p:last-child {
            margin-bottom: 0;
        }
        /* FAQ 快速入口 */
        .faq-quick-section {
            max-width: 1320px;
            margin: 0 auto 100px auto;
            padding: 0 24px;
        }
        .faq-quick-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
            margin-top: 40px;
        }
        .faq-quick-card {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            border-radius: 20px;
            padding: 32px;
            display: flex;
            gap: 20px;
            align-items: flex-start;
            transition: all 0.2s ease;
            text-decoration: none;
            color: inherit;
        }
        .faq-quick-card:hover {
            border-color: #2563eb;
            background: #f8fafc;
        }
        .faq-quick-icon {
            font-size: 28px;
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            background: #f1f5f9;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .faq-quick-text h5 {
            font-size: 18px;
            font-weight: 800;
            color: #0f172a;
            margin: 0 0 8px 0;
        }
        .faq-quick-text p {
            font-size: 14px;
            color: #4a5568;
            margin: 0;
            line-height: 1.5;
        }
        /* 页脚 */
        .footer {
            background-color: #0b0f19;
            color: #94a3b8;
            padding: 80px 24px 40px 24px;
            font-size: 14px;
            border-top: 1px solid #1e293b;
        }
        .footer-inner {
            max-width: 1272px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1.6fr repeat(3, 1fr);
            gap: 60px;
            margin-bottom: 60px;
        }
        .footer-brand h4 {
            color: #ffffff;
            font-size: 20px;
            font-weight: 800;
            margin: 0 0 20px 0;
            letter-spacing: -0.02em;
        }
        .footer-brand p {
            line-height: 1.7;
            margin: 0;
            font-size: 14px;
            color: #64748b;
        }
        .footer-col h5 {
            color: #ffffff;
            font-size: 16px;
            font-weight: 700;
            margin: 0 0 20px 0;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 12px;
        }
        .footer-col ul li a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.15s ease;
            font-weight: 500;
        }
        .footer-col ul li a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            max-width: 1272px;
            margin: 0 auto;
            padding-top: 36px;
            border-top: 1px solid #1e293b;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 24px;
            color: #475569;
            font-weight: 500;
        }
        @media (max-width: 1024px) {
            .download-grid { grid-template-columns: 1fr; }
            .changelog-grid { grid-template-columns: 1fr; }
        }
        @media (max-width: 768px) {
            .nav-container { padding: 0; }
            .nav-links { display: none; }
            .download-header { padding-top: 130px; padding-left: 0; padding-right: 0; }
            .download-header h1 { font-size: 32px; }
            .download-grid { padding: 0; }
            .download-card { padding: 32px; }
            .steps-grid { grid-template-columns: 1fr; }
            .faq-quick-grid { grid-template-columns: 1fr; }
            .security-notice-section { padding: 0; }
            .notice-content { padding: 32px; }
            .footer-inner { grid-template-columns: 1fr; gap: 40px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .changelog-container { padding: 32px; }
        }