/* ============ 全局样式 ============ */
        * { margin:0; padding:0; box-sizing:border-box; font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", Roboto, sans-serif; }
        :root {
            --primary: #7c3aed;
            --primary-light: #a78bfa;
            --primary-dark: #5b21b6;
            --secondary: #3b82f6;
            --accent: #ec4899;
            --bg: #faf5ff;
            --bg-card: #ffffff;
            --text-dark: #0f172a;
            --text-mid: #475569;
            --text-light: #94a3b8;
            --border: #e2e8f0;
            --shadow: 0 4px 24px rgba(124, 58, 237, 0.08);
            --radius: 16px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --red: #dc2626;
            --green: #16a34a;
        }
        body { background: var(--bg); color: var(--text-dark); line-height: 1.6; }
        a { text-decoration: none; color: inherit; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }

        /* ============ 头部导航（与首页一致） ============ */
        header {
            position: sticky; top: 0; z-index: 100;
            background: rgba(255,255,255,0.72); backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(124,58,237,0.06);
        }
        .nav-inner {
            display: flex; justify-content: space-between; align-items: center;
            padding: 0.8rem 0; max-width: 1200px; margin: 0 auto; padding: 0.8rem 2rem;
        }
        .brand { display: flex; align-items: center; gap: 0.6rem; font-weight: 800; font-size: 1.3rem; color: var(--primary-dark); }
        .brand svg { width: 32px; height: 32px; }
        .brand span { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .nav-links { display: flex; gap: 2.2rem; list-style: none; font-weight: 500; font-size: 0.95rem; color: var(--text-mid); }
        .nav-links a { transition: var(--transition); }
        .nav-links a:hover, .nav-links a.active { color: var(--primary); }
        .nav-actions { display: flex; gap: 0.8rem; align-items: center; }
        .btn-primary {
            padding: 0.5rem 1.4rem; background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 40px; font-weight: 600; font-size: 0.85rem; color: #fff;
            transition: var(--transition); box-shadow: 0 2px 12px rgba(124,58,237,0.25);
            display: inline-block;
        }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(124,58,237,0.35); }

        /* ============ 下载 Hero 区域 ============ */
        .download-hero {
            padding: 4rem 0 2rem; text-align: center;
        }
        .download-hero .badge {
            display: inline-flex; align-items: center; gap: 0.4rem;
            background: rgba(124,58,237,0.08); color: var(--primary);
            padding: 0.2rem 0.8rem; border-radius: 40px; font-size: 0.8rem; font-weight: 600;
            border: 1px solid rgba(124,58,237,0.12); margin-bottom: 1rem;
        }
        .download-hero h1 {
            font-size: 3.2rem; font-weight: 900; letter-spacing: -1.5px; line-height: 1.1; margin-bottom: 0.8rem;
        }
        .download-hero h1 .gradient {
            background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
        }
        .download-hero p {
            font-size: 1.15rem; color: var(--text-mid); max-width: 700px; margin: 0 auto 1.5rem;
        }

        /* ============ 平台下载卡片 ============ */
        .platform-grid {
            display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; padding: 2rem 0 3rem;
        }
        .platform-card {
            background: var(--bg-card); border-radius: var(--radius); padding: 2rem 1.5rem; text-align: center;
            border: 1px solid var(--border); transition: var(--transition); box-shadow: var(--shadow);
            display: flex; flex-direction: column; align-items: center;
        }
        .platform-card:hover { transform: translateY(-6px); border-color: var(--primary-light); box-shadow: 0 8px 32px rgba(124,58,237,0.12); }
        .platform-card .icon {
            width: 64px; height: 64px; margin: 0 auto 1rem; border-radius: 14px;
            background: rgba(124,58,237,0.06); display: grid; place-items: center;
        }
        .platform-card .icon svg { width: 36px; height: 36px; fill: var(--primary); }
        .platform-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.2rem; }
        .platform-card .os { font-size: 0.85rem; color: var(--text-light); margin-bottom: 0.4rem; }
        .platform-card .version {
            font-size: 0.75rem; background: var(--bg); padding: 0.15rem 0.7rem; border-radius: 20px;
            color: var(--text-mid); border: 1px solid var(--border); display: inline-block; margin-bottom: 1rem;
        }
        .platform-card .btn-dl {
            display: inline-block; padding: 0.6rem 1.6rem; border-radius: 40px;
            background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; font-weight: 700;
            font-size: 0.9rem; transition: var(--transition); box-shadow: 0 2px 12px rgba(124,58,237,0.2);
            white-space: nowrap; min-width: 120px; text-align: center;
        }
        .platform-card .btn-dl:hover { transform: scale(1.03); box-shadow: 0 6px 20px rgba(124,58,237,0.3); }

        /* ============ 下载安全验证版块 ============ */
        .verify-section {
            padding: 4rem 0; background: #fff; border-top: 1px solid var(--border);
        }
        .verify-section h2 { text-align: center; font-size: 2.4rem; font-weight: 800; letter-spacing: -1px; margin-bottom: 1rem; }
        .verify-section .sub { text-align: center; color: var(--text-mid); max-width: 640px; margin: 0 auto 2.5rem; }
        .verify-grid {
            display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem;
        }
        .verify-card {
            background: var(--bg); border-radius: var(--radius); padding: 2rem; text-align: center;
            border: 1px solid var(--border); transition: var(--transition);
        }
        .verify-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow); }
        .verify-card .v-icon {
            width: 48px; height: 48px; margin: 0 auto 1rem; border-radius: 12px;
            background: linear-gradient(135deg, rgba(124,58,237,0.08), rgba(59,130,246,0.08));
            display: grid; place-items: center;
        }
        .verify-card .v-icon svg { width: 24px; height: 24px; fill: var(--primary); }
        .verify-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.4rem; }
        .verify-card p { font-size: 0.95rem; color: var(--text-mid); }

        /* ============ 安装指南版块 ============ */
        .install-section {
            padding: 4rem 0; background: var(--bg); border-top: 1px solid var(--border);
        }
        .install-section h2 { text-align: center; font-size: 2.4rem; font-weight: 800; letter-spacing: -1px; margin-bottom: 1rem; }
        .install-section .sub { text-align: center; color: var(--text-mid); max-width: 560px; margin: 0 auto 2.5rem; }
        .steps-grid {
            display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem;
        }
        .step-card {
            background: #fff; border-radius: var(--radius); padding: 2rem; border: 1px solid var(--border);
            position: relative; transition: var(--transition);
        }
        .step-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow); }
        .step-number {
            position: absolute; top: -1rem; left: 2rem; background: var(--primary); color: #fff;
            font-weight: 800; font-size: 0.9rem; padding: 0.3rem 0.8rem; border-radius: 20px;
        }
        .step-card h4 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.4rem; margin-top: 0.5rem; }
        .step-card p { color: var(--text-mid); font-size: 0.95rem; }

        /* ============ 多端同步版块 ============ */
        .sync-section {
            padding: 4rem 0; background: #fff; border-top: 1px solid var(--border);
        }
        .sync-section h2 { text-align: center; font-size: 2.4rem; font-weight: 800; letter-spacing: -1px; margin-bottom: 1rem; }
        .sync-section .sub { text-align: center; color: var(--text-mid); max-width: 640px; margin: 0 auto 2.5rem; }
        .sync-flex {
            display: flex; gap: 2rem; align-items: center; justify-content: center; flex-wrap: wrap;
        }
        .sync-item {
            background: var(--bg); border-radius: var(--radius); padding: 1.5rem 2rem; text-align: center;
            border: 1px solid var(--border); transition: var(--transition); min-width: 150px;
        }
        .sync-item:hover { transform: translateY(-4px); border-color: var(--primary-light); box-shadow: var(--shadow); }
        .sync-item .s-icon { width: 40px; height: 40px; margin: 0 auto 0.5rem; border-radius: 10px; background: rgba(124,58,237,0.08); display: grid; place-items: center; }
        .sync-item .s-icon svg { width: 20px; height: 20px; fill: var(--primary); }
        .sync-item strong { display: block; font-size: 1rem; font-weight: 700; }
        .sync-item span { font-size: 0.8rem; color: var(--text-light); }

        /* ============ FAQ 下载相关 ============ */
        .download-faq {
            padding: 4rem 0; background: var(--bg); border-top: 1px solid var(--border);
        }
        .download-faq h2 { text-align: center; font-size: 2.4rem; font-weight: 800; letter-spacing: -1px; margin-bottom: 1rem; }
        .download-faq .sub { text-align: center; color: var(--text-mid); max-width: 560px; margin: 0 auto 2.5rem; }
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            background: #fff; border: 1px solid var(--border); border-radius: 12px; margin-bottom: 1rem; overflow: hidden;
        }
        .faq-item summary {
            padding: 1.2rem 1.5rem; font-weight: 600; cursor: pointer; list-style: none;
            display: flex; align-items: center; justify-content: space-between;
        }
        .faq-item summary::after { content: '+'; font-size: 1.5rem; color: var(--primary); transition: var(--transition); }
        .faq-item[open] summary::after { content: '−'; transform: rotate(180deg); }
        .faq-item p { padding: 0 1.5rem 1.2rem; color: var(--text-mid); font-size: 0.95rem; }

        /* ============ CTA 区域 ============ */
        .cta-download {
            padding: 4rem 0; background: linear-gradient(135deg, var(--primary-dark), var(--secondary)); color: #fff;
            text-align: center;
        }
        .cta-download h2 { font-size: 2.4rem; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 0.6rem; }
        .cta-download p { color: rgba(255,255,255,0.8); max-width: 480px; margin: 0 auto 1.8rem; }
        .cta-download .btn-white {
            padding: 0.9rem 2.4rem; background: #fff; color: var(--primary-dark); border-radius: 40px;
            font-weight: 700; font-size: 1rem; transition: var(--transition); display: inline-block;
        }
        .cta-download .btn-white:hover { transform: translateY(-3px); box-shadow: 0 8px 32px rgba(0,0,0,0.2); }

        /* ============ 页脚（与首页一致） ============ */
        footer { background: #0f172a; color: #94a3b8; padding: 4rem 0 2rem; font-size: 0.9rem; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
        .footer-brand p { margin-top: 0.8rem; max-width: 300px; color: #64748b; }
        .footer-col h4 { color: #f1f5f9; font-size: 0.95rem; margin-bottom: 1rem; }
        .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; }
        .footer-col a { color: #94a3b8; transition: var(--transition); }
        .footer-col a:hover { color: var(--primary-light); }
        .footer-bottom { border-top: 1px solid #1e293b; padding-top: 2rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }

        /* 页脚下拉工具区 */
        .footer-tools { display: flex; flex-wrap: wrap; gap: 1.5rem; margin: 2rem 0; padding-top: 1.5rem; border-top: 1px solid #1e293b; }
        .footer-select { position: relative; display: inline-block; }
        .footer-select-btn {
            display: flex; align-items: center; justify-content: space-between; gap: 8px; width: 220px; padding: 10px 14px;
            background: rgba(255,255,255,0.05); color: #fff; border: 1px solid rgba(168,85,247,0.3); border-radius: 6px;
            font-size: 13px; cursor: pointer; transition: var(--transition);
        }
        .footer-select-btn:hover { border-color: var(--primary-light); background: rgba(124,58,237,0.08); }
        .footer-select-btn svg { flex-shrink: 0; transition: transform 0.3s ease; }
        .footer-select.active .footer-select-btn svg { transform: rotate(180deg); }
        .footer-select-dropdown {
            position: absolute; bottom: calc(100% + 8px); left: 0; width: 100%; max-height: 260px; overflow-y: auto;
            background: rgba(20,10,35,0.98); border: 1px solid rgba(168,85,247,0.3); border-radius: 8px; padding: 6px 0;
            display: none; z-index: 999; box-shadow: 0 12px 32px rgba(0,0,0,0.3); backdrop-filter: blur(8px);
        }
        .footer-select.active .footer-select-dropdown { display: block; }
        .footer-select-dropdown a {
            display: block; padding: 8px 14px; color: #b0aac2; text-decoration: none; font-size: 12px; transition: var(--transition);
        }
        .footer-select-dropdown a:hover { color: #fff; background: rgba(124,58,237,0.15); }
        .footer-select-dropdown::-webkit-scrollbar { width: 4px; }
        .footer-select-dropdown::-webkit-scrollbar-track { background: transparent; }
        .footer-select-dropdown::-webkit-scrollbar-thumb { background: rgba(168,85,247,0.4); border-radius: 4px; }

        /* ============ 响应式 ============ */
        @media (max-width: 1024px) {
            .platform-grid { grid-template-columns: repeat(2, 1fr); }
            .verify-grid, .steps-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .sync-flex { justify-content: center; }
        }
        @media (max-width: 640px) {
            .download-hero h1 { font-size: 2.2rem; }
            .platform-grid { grid-template-columns: 1fr; }
            .verify-grid, .steps-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            .nav-links { display: none; }
            .container { padding: 0 1rem; }
            .nav-inner { padding: 0.8rem 1rem; }
            .platform-card .btn-dl { min-width: 100px; font-size: 0.85rem; padding: 0.5rem 1.2rem; }
            .footer-tools { flex-direction: column; }
            .footer-select, .footer-select-btn { width: 100%; }
            .footer-select-dropdown { min-width: 100%; }
        }