:root {
            --bg: #fef9f2;
            --surface: #ffffff;
            --text: #1e1e1e;
            --text-secondary: #5f5f5f;
            --brand: #f59e0b;
            --brand-dark: #d97706;
            --safe: #10b981;
            --border: #e5e7eb;
            --border-light: #f3f4f6;
            --radius: 16px;
            --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "SF Pro Display", Helvetica, Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
        }
        header {
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            background: rgba(254, 249, 242, 0.9);
            backdrop-filter: blur(16px);
            z-index: 100;
        }
        .nav-wrapper {
            max-width: 1300px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 24px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }
        .brand-logo svg {
            width: 32px;
            height: 32px;
            fill: var(--brand);
        }
        .brand-name {
            font-size: 20px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.5px;
        }
        .brand-badge {
            font-size: 11px;
            font-weight: 700;
            background: #fef3c7;
            color: #b45309;
            padding: 2px 8px;
            border-radius: 4px;
        }
        nav {
            display: flex;
            gap: 36px;
        }
        nav a {
            text-decoration: none;
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 14px;
            transition: color 0.2s;
        }
        nav a:hover,
        nav a.active {
            color: var(--brand-dark);
        }

        .container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 页面标题区 */
        .page-hero {
            text-align: center;
            padding: 80px 0 40px;
        }
        .page-hero h1 {
            font-size: 44px;
            font-weight: 900;
            letter-spacing: -1.5px;
            margin-bottom: 20px;
        }
        .page-hero h1 span {
            color: var(--brand);
        }
        .page-hero p {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 700px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* 多端下载卡片 */
        .download-tabs {
            display: flex;
            justify-content: center;
            gap: 8px;
            margin-bottom: 48px;
            flex-wrap: wrap;
        }
        .tab-btn {
            background: #fff;
            border: 1px solid var(--border);
            padding: 12px 28px;
            border-radius: 40px;
            font-weight: 700;
            font-size: 14px;
            cursor: pointer;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-secondary);
        }
        .tab-btn.active {
            background: var(--text);
            color: #fff;
            border-color: var(--text);
        }
        .tab-btn:hover {
            border-color: var(--brand);
        }
        .platform-panel {
            display: none;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 24px;
            padding: 40px;
            margin-bottom: 60px;
            text-align: center;
            box-shadow: 0 8px 24px rgba(0,0,0,0.02);
        }
        .platform-panel.active {
            display: block;
        }
        .platform-icon {
            font-size: 56px;
            margin-bottom: 20px;
        }
        .platform-panel h3 {
            font-size: 28px;
            font-weight: 800;
            margin-bottom: 12px;
        }
        .platform-panel .version-badge {
            display: inline-block;
            background: #fef3c7;
            color: #92400e;
            padding: 4px 16px;
            border-radius: 20px;
            font-weight: 700;
            font-size: 14px;
            margin-bottom: 24px;
        }
        .btn-download-lg {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            background: var(--text);
            color: #fff;
            padding: 18px 40px;
            border-radius: 40px;
            text-decoration: none;
            font-weight: 800;
            font-size: 18px;
            transition: background 0.2s;
            margin: 12px;
        }
        .btn-download-lg:hover {
            background: #2d2d2d;
        }
        .btn-download-lg.secondary {
            background: transparent;
            color: var(--text);
            border: 2px solid var(--border);
        }
        .btn-download-lg.secondary:hover {
            border-color: var(--brand);
        }
        .file-meta {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 16px;
            font-family: var(--mono);
        }

        /* 更新日志时间轴 */
        .changelog {
            margin-bottom: 80px;
        }
        .changelog h2 {
            font-size: 32px;
            font-weight: 900;
            margin-bottom: 40px;
            text-align: center;
        }
        .timeline {
            display: flex;
            flex-direction: column;
            gap: 24px;
            max-width: 800px;
            margin: 0 auto;
        }
        .timeline-item {
            display: flex;
            gap: 20px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 24px;
            transition: box-shadow 0.2s;
        }
        .timeline-item:hover {
            box-shadow: 0 4px 16px rgba(0,0,0,0.04);
        }
        .timeline-date {
            font-family: var(--mono);
            font-weight: 800;
            color: var(--brand-dark);
            min-width: 90px;
            font-size: 14px;
        }
        .timeline-content h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .timeline-content p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* 校验卡片 */
        .verify-card {
            background: #1e1e1e;
            color: #e5e7eb;
            border-radius: 20px;
            padding: 48px;
            margin-bottom: 80px;
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            align-items: center;
            justify-content: space-between;
        }
        .verify-info h3 {
            font-size: 24px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }
        .verify-info code {
            background: #0f172a;
            padding: 8px 16px;
            border-radius: 8px;
            font-family: var(--mono);
            font-size: 14px;
            color: #fbbf24;
            word-break: break-all;
        }
        .verify-badge {
            display: flex;
            align-items: center;
            gap: 12px;
            background: #065f46;
            color: #6ee7b7;
            padding: 12px 28px;
            border-radius: 40px;
            font-weight: 700;
        }

        /* GitHub 开源 */
        .github-inline {
            background: linear-gradient(135deg, #fef3c7, #fff);
            border: 1px solid #fcd34d;
            border-radius: 20px;
            padding: 40px;
            display: flex;
            align-items: center;
            gap: 32px;
            flex-wrap: wrap;
            margin-bottom: 80px;
        }
        .github-inline .gh-icon {
            width: 60px;
            height: 60px;
            background: #1e1e1e;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #f59e0b;
        }
        .github-inline h4 {
            font-size: 20px;
            font-weight: 800;
            margin-bottom: 8px;
        }
        .github-inline p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.5;
        }
        .btn-github-outline {
            background: #1e1e1e;
            color: #fbbf24;
            padding: 14px 28px;
            border-radius: 40px;
            text-decoration: none;
            font-weight: 700;
            white-space: nowrap;
        }

        /* 常见问题手风琴 */
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            margin-bottom: 80px;
        }
        @media (max-width: 700px) { .faq-grid { grid-template-columns: 1fr; } }
        details {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 20px 24px;
            cursor: pointer;
            transition: border-color 0.2s;
        }
        details[open] { border-color: var(--brand); }
        summary {
            font-weight: 700;
            font-size: 16px;
            list-style: none;
            display: flex;
            justify-content: space-between;
        }
        summary::-webkit-details-marker { display: none; }
        summary::after { content: "+"; font-size: 22px; color: var(--brand); }
        details[open] summary::after { content: "−"; }
        .faq-answer {
            margin-top: 16px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Footer */
        footer {
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 60px 24px 40px;
        }
        .footer-grid {
            max-width: 1300px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1.5fr repeat(3, 1fr);
            gap: 40px;
            padding-bottom: 40px;
        }
        @media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
        .footer-col h5 {
            font-size: 13px;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: #9ca3af;
            margin-bottom: 20px;
        }
        .footer-col ul { list-style: none; }
        .footer-col li { margin-bottom: 10px; }
        .footer-col a { color: var(--text-secondary); text-decoration: none; font-size: 14px; }
        .footer-col a:hover { color: var(--brand-dark); }
        .footer-bottom {
            max-width: 1300px;
            margin: 0 auto;
            border-top: 1px solid var(--border);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-secondary);
            flex-wrap: wrap;
            gap: 16px;
        }
        .footer-bottom a { color: var(--text-secondary); text-decoration: none; margin-left: 20px; }