/* ========== CSS Reset & 变量 ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        :root {
            --primary: #6366F1;
            --primary-deep: #4F46E5;
            --primary-dark: #3730A3;
            --accent: #14B8A6;
            --accent-glow: #5EEAD4;
            --bg: #F9FAFB;
            --surface: #FFFFFF;
            --surface-alt: #F1F5F9;
            --text: #1E293B;
            --text-secondary: #64748B;
            --text-muted: #94A3B8;
            --border: #E2E8F0;
            --border-light: #F1F5F9;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.1), 0 4px 16px rgba(0, 0, 0, 0.06);
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.7;
            min-height: 100vh;
        }

        /* ========== Header ========== */
        header {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            background: rgba(255, 255, 255, 0.88);
            box-shadow: var(--shadow-sm);
        }
        .header-box {
            max-width: 1280px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            height: 60px;
            gap: 20px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            color: var(--text);
            font-weight: 700;
            font-size: 1.1rem;
            flex-shrink: 0;
            letter-spacing: -0.3px;
            transition: var(--transition);
        }
        .brand-logo:hover {
            color: var(--primary);
        }
        .brand-logo img {
            width: 34px;
            height: 34px;
            border-radius: 8px;
            object-fit: contain;
        }
        .brand-dot {
            display: inline-block;
            width: 7px;
            height: 7px;
            background: var(--accent);
            border-radius: 50%;
            margin: 0 2px;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.4;
                transform: scale(1.6);
            }
        }
        nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
            justify-content: flex-end;
        }
        nav a {
            text-decoration: none;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.9rem;
            padding: 8px 14px;
            border-radius: 8px;
            transition: var(--transition);
            white-space: nowrap;
            position: relative;
        }
        nav a:hover {
            color: var(--primary);
            background: #EEF2FF;
        }
        nav a.current-tab {
            color: var(--primary);
            background: #EEF2FF;
            font-weight: 600;
        }
        .nav-accent {
            background: linear-gradient(135deg, #EEF2FF, #E0F2FE);
            color: var(--primary-deep) !important;
            font-weight: 600 !important;
        }
        .nav-accent:hover {
            background: linear-gradient(135deg, #E0E7FF, #CFFAFE) !important;
        }

        /* ========== Main Container ========== */
        main {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== Section 通用 ========== */
        .section-inner {
            max-width: 1100px;
            margin: 0 auto;
            padding: 60px 0;
        }
        section h2 {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            text-align: center;
            margin-bottom: 12px;
            color: var(--text);
        }
        .section-lead {
            text-align: center;
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 680px;
            margin: 0 auto 40px;
            line-height: 1.8;
        }

        /* ========== Page Hero ========== */
        .page-hero {
            padding: 48px 0 40px;
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }
        .page-hero .badge {
            display: inline-block;
            background: #EEF2FF;
            color: var(--primary-deep);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 6px 16px;
            border-radius: 20px;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
            border: 1px solid #C7D2FE;
        }
        .page-hero h1 {
            font-size: 2.6rem;
            font-weight: 900;
            letter-spacing: -1px;
            line-height: 1.25;
            margin-bottom: 16px;
        }
        .page-hero h1 .gradient-text {
            background: linear-gradient(135deg, #6366F1, #14B8A6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-hero .desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 24px;
        }
        .quick-jump {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .quick-jump a {
            background: var(--surface);
            border: 1px solid var(--border);
            padding: 8px 18px;
            border-radius: 20px;
            text-decoration: none;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .quick-jump a:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: #EEF2FF;
        }

        /* ========== 稳定版下载卡片（含Android） ========== */
        .section-stable {
            background: var(--surface);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow);
            margin-bottom: 20px;
        }
        .section-stable .section-inner {
            padding: 48px 32px;
        }
        .stable-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 20px;
        }
        .download-card {
            background: var(--bg);
            border-radius: var(--radius-lg);
            padding: 24px 22px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .download-card:hover {
            box-shadow: var(--shadow-lg);
            border-color: #C7D2FE;
            transform: translateY(-2px);
        }
        .download-card .os-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 700;
            font-size: 1.1rem;
            margin-bottom: 10px;
            color: var(--text);
        }
        .download-card .meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 12px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }
        .download-card .meta span {
            background: var(--surface);
            padding: 2px 8px;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-size: 0.75rem;
        }
        .download-card .btn-dl {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            background: linear-gradient(135deg, #6366F1, #4F46E5);
            color: #fff;
            font-weight: 700;
            padding: 12px 20px;
            border-radius: 28px;
            text-decoration: none;
            font-size: 0.9rem;
            transition: var(--transition);
            margin-top: auto;
            border: none;
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
        }
        .download-card .btn-dl:hover {
            background: linear-gradient(135deg, #4F46E5, #3730A3);
            box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
            transform: translateY(-1px);
        }
        .download-card .btn-dl.secondary {
            background: var(--surface);
            color: var(--primary-deep);
            border: 2px solid #C7D2FE;
            box-shadow: none;
            margin-top: 8px;
        }
        .download-card .btn-dl.secondary:hover {
            background: #EEF2FF;
            border-color: var(--primary);
            box-shadow: var(--shadow-sm);
        }
        .checksum {
            font-family: var(--font-mono);
            font-size: 0.7rem;
            color: var(--text-muted);
            margin-top: 8px;
            word-break: break-all;
            background: #F8FAFC;
            padding: 4px 8px;
            border-radius: 4px;
        }

        /* ========== 测试版区块 ========== */
        .section-beta {
            margin-bottom: 20px;
            background: linear-gradient(135deg, #FFF7ED, #FFF1F2);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow);
        }
        .section-beta .section-inner {
            padding: 48px 32px;
        }
        .beta-warning {
            display: inline-block;
            background: #F97316;
            color: #fff;
            font-weight: 600;
            font-size: 0.85rem;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .beta-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 20px;
            margin-top: 24px;
        }
        .beta-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 22px 20px;
            border: 1px dashed #F97316;
            transition: var(--transition);
        }
        .beta-card:hover {
            box-shadow: var(--shadow-lg);
            border-style: solid;
        }
        .beta-card .version-tag {
            font-weight: 800;
            color: #F97316;
            font-size: 1rem;
        }
        .beta-card .changes {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin: 10px 0;
        }
        .beta-card .btn-dl {
            display: inline-block;
            background: #F97316;
            color: #fff;
            font-weight: 600;
            padding: 8px 18px;
            border-radius: 20px;
            text-decoration: none;
            font-size: 0.85rem;
            transition: var(--transition);
        }
        .beta-card .btn-dl:hover {
            background: #EA580C;
            transform: translateY(-1px);
        }

        /* ========== 历史版本时间轴 ========== */
        .section-history {
            margin-bottom: 20px;
        }
        .timeline {
            position: relative;
            padding-left: 32px;
            margin-top: 24px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 12px;
            top: 0;
            bottom: 0;
            width: 3px;
            background: linear-gradient(to bottom, #C7D2FE, #99F6E4);
            border-radius: 3px;
        }
        .timeline-item {
            position: relative;
            margin-bottom: 28px;
            background: var(--surface);
            border-radius: var(--radius);
            padding: 20px 22px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .timeline-item:hover {
            box-shadow: var(--shadow-lg);
            transform: translateX(4px);
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -25px;
            top: 24px;
            width: 11px;
            height: 11px;
            background: var(--primary);
            border-radius: 50%;
            border: 2px solid #fff;
            box-shadow: 0 0 0 3px #C7D2FE;
        }
        .timeline-item .version-tag {
            font-weight: 800;
            font-size: 1.1rem;
            color: var(--primary-deep);
            margin-bottom: 6px;
        }
        .timeline-item .date {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .timeline-item .changes {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .timeline-item .dl-link {
            display: inline-block;
            margin-top: 10px;
            font-weight: 600;
            color: var(--primary);
            text-decoration: none;
            font-size: 0.85rem;
        }
        .timeline-item .dl-link:hover {
            text-decoration: underline;
        }

        /* ========== 安装指引摘要 ========== */
        .section-install-summary {
            background: var(--surface);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow);
            margin-bottom: 20px;
        }
        .section-install-summary .section-inner {
            padding: 48px 32px;
        }
        .install-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 18px;
        }
        .install-card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 22px 20px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .install-card:hover {
            box-shadow: var(--shadow);
            border-color: #C7D2FE;
        }
        .install-card h3 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--primary-deep);
        }
        .install-card p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ========== 迁移指南区块 ========== */
        .section-migration {
            margin-bottom: 20px;
            background: #F0F9FF;
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow);
        }
        .section-migration .section-inner {
            padding: 48px 32px;
        }
        .migration-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 18px;
            margin-top: 20px;
        }
        .migration-card {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 22px 20px;
            border-left: 4px solid var(--primary);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .migration-card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-2px);
        }
        .migration-card h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--primary-deep);
            margin-bottom: 8px;
        }
        .migration-card p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ========== 配置模板下载 ========== */
        .section-templates {
            margin-bottom: 20px;
        }
        .template-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 16px;
            margin-top: 20px;
        }
        .template-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px;
            text-align: center;
            transition: var(--transition);
        }
        .template-card:hover {
            box-shadow: var(--shadow-lg);
            border-color: #C7D2FE;
        }
        .template-card .icon {
            font-size: 2rem;
            margin-bottom: 8px;
        }
        .template-card h3 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .template-card p {
            font-size: 0.8rem;
            color: var(--text-secondary);
            margin-bottom: 12px;
        }
        .template-card .btn-dl {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            padding: 8px 16px;
            border-radius: 20px;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.85rem;
            transition: var(--transition);
        }
        .template-card .btn-dl:hover {
            background: var(--primary-deep);
            transform: translateY(-1px);
        }

        /* ========== 安全校验区块 ========== */
        .section-verify {
            margin-bottom: 20px;
        }
        .verify-box {
            background: var(--surface);
            border-radius: var(--radius-xl);
            padding: 40px 32px;
            box-shadow: var(--shadow);
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            align-items: center;
            justify-content: center;
            text-align: center;
        }
        .verify-item {
            flex: 1 1 200px;
        }
        .verify-item strong {
            display: block;
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--primary-deep);
            margin-bottom: 6px;
        }
        .verify-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        .verify-item code {
            background: #F1F5F9;
            padding: 4px 8px;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-size: 0.8rem;
            word-break: break-all;
        }

        /* ========== Footer ========== */
        footer {
            background: #1E293B;
            color: #CBD5E1;
            margin-top: 32px;
            padding: 48px 24px 32px;
        }
        .footer-wrapper {
            max-width: 1280px;
            margin: 0 auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 28px;
            margin-bottom: 32px;
        }
        .footer-section h5 {
            font-size: 0.95rem;
            font-weight: 700;
            color: #F1F5F9;
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }
        .footer-section ul {
            list-style: none;
        }
        .footer-section ul li {
            margin-bottom: 6px;
        }
        .footer-section ul li a {
            color: #94A3B8;
            text-decoration: none;
            font-size: 0.85rem;
            transition: var(--transition);
        }
        .footer-section ul li a:hover {
            color: #E2E8F0;
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .footer-legal {
            border-top: 1px solid #334155;
            padding-top: 20px;
            text-align: center;
            font-size: 0.8rem;
            color: #64748B;
            line-height: 1.8;
        }
        .footer-legal p {
            margin-bottom: 4px;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 768px) {
            .header-box {
                flex-direction: column;
                height: auto;
                padding: 12px 16px;
                gap: 10px;
            }
            nav {
                gap: 2px;
            }
            nav a {
                font-size: 0.8rem;
                padding: 6px 10px;
            }
            .page-hero h1 {
                font-size: 1.9rem;
            }
            section h2 {
                font-size: 1.5rem;
            }
            .section-inner {
                padding: 36px 16px;
            }
            .section-stable .section-inner,
            .section-beta .section-inner,
            .section-install-summary .section-inner,
            .section-migration .section-inner {
                padding: 36px 16px;
            }
            .stable-grid,
            .beta-grid {
                grid-template-columns: 1fr;
            }
            .timeline {
                padding-left: 24px;
            }
            .timeline-item::before {
                left: -18px;
            }
            .verify-box {
                flex-direction: column;
            }
        }
        @media (max-width: 480px) {
            .page-hero h1 {
                font-size: 1.6rem;
            }
            .quick-jump a {
                font-size: 0.8rem;
                padding: 6px 12px;
            }
            .template-grid {
                grid-template-columns: 1fr;
            }
        }