*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        :root {
            --primary: #6366F1;
            --primary-deep: #4F46E5;
            --accent: #14B8A6;
            --bg: #F9FAFB;
            --surface: #FFFFFF;
            --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);
            --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; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
        }
        header {
            background: rgba(255,255,255,0.88);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            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;
            transition: var(--transition);
        }
        .brand-logo:hover { color: var(--primary); }
        .brand-logo img { width: 34px; height: 34px; border-radius: 8px; object-fit: contain; }
        .brand-dot {
            width: 7px; height: 7px; background: var(--accent); border-radius: 50%;
            margin: 0 2px; animation: pulse-dot 2s infinite; display: inline-block;
        }
        @keyframes pulse-dot {
            0%,100% { opacity:1; transform:scale(1); }
            50% { opacity:0.4; transform:scale(1.6); }
        }
        nav { display: flex; gap: 4px; flex-wrap: wrap; }
        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;
        }
        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; }

        main { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
        .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;
        }
        .section-lead {
            text-align: center; color: var(--text-secondary); font-size: 1.05rem;
            max-width: 700px; margin: 0 auto 40px; line-height: 1.8;
        }

        .page-hero { padding: 48px 0 40px; text-align: center; max-width: 800px; margin: 0 auto; }
        .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; border: 1px solid #C7D2FE; }
        .gradient-text { background: linear-gradient(135deg, #6366F1, #14B8A6); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .page-hero h1 { font-size: 2.6rem; font-weight: 900; letter-spacing: -1px; line-height: 1.25; margin-bottom: 16px; }
        .desc { font-size: 1.05rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 24px; }

        /* 版本统计卡片 */
        .stats-row { display: flex; flex-wrap: wrap; gap: 20px; justify-content: center; margin-bottom: 40px; }
        .stat-card {
            background: var(--surface); border-radius: var(--radius-lg); padding: 20px 28px;
            box-shadow: var(--shadow); text-align: center; min-width: 140px;
            transition: var(--transition); border: 1px solid var(--border-light);
        }
        .stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
        .stat-number { font-size: 2.5rem; font-weight: 900; color: var(--primary-deep); }
        .stat-label { color: var(--text-secondary); font-size: 0.85rem; }

        /* 版本筛选器 */
        .filter-bar { display: flex; justify-content: center; gap: 12px; margin-bottom: 40px; flex-wrap: wrap; }
        .filter-btn { display: none; }
        .filter-label {
            background: var(--surface); border: 1px solid var(--border); padding: 8px 22px;
            border-radius: 28px; font-weight: 600; cursor: pointer; transition: var(--transition);
            font-size: 0.9rem; color: var(--text-secondary);
        }
        .filter-btn:checked + .filter-label {
            background: var(--primary); color: #fff; border-color: var(--primary);
        }

        /* 时间轴 */
        .timeline { position: relative; padding-left: 40px; margin-top: 20px; }
        .timeline::before {
            content: ''; position: absolute; left: 14px; top: 0; bottom: 0;
            width: 3px; background: linear-gradient(to bottom, #C7D2FE, #99F6E4); border-radius: 3px;
        }
        .tl-item { position: relative; margin-bottom: 32px; }
        .tl-item::before {
            content: ''; position: absolute; left: -32px; top: 16px;
            width: 11px; height: 11px; background: var(--primary); border-radius: 50%;
            border: 2px solid #fff; box-shadow: 0 0 0 3px #C7D2FE; z-index: 2;
        }
        .tl-item.milestone::before { background: #F59E0B; box-shadow: 0 0 0 3px #FDE68A; }
        .tl-card {
            background: var(--surface); border-radius: var(--radius); padding: 20px 24px;
            box-shadow: var(--shadow); border: 1px solid var(--border-light);
            transition: var(--transition); display: flex; flex-wrap: wrap; gap: 16px;
            align-items: flex-start;
        }
        .tl-card:hover { box-shadow: var(--shadow-lg); border-color: #C7D2FE; transform: translateX(4px); }
        .tl-version {
            font-weight: 800; font-size: 1.2rem; color: var(--primary-deep);
            min-width: 120px; font-family: var(--font-mono);
        }
        .tl-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 6px; }
        .tl-tag {
            padding: 2px 10px; border-radius: 12px; font-size: 0.75rem; font-weight: 600;
            background: #DCFCE7; color: #166534;
        }
        .tl-tag.stable { background: #DBEAFE; color: #1E40AF; }
        .tl-tag.beta { background: #FEF3C7; color: #92400E; }
        .tl-tag.major { background: #FCE7F3; color: #9D174D; }
        .tl-content { flex: 1; }
        .tl-content ul { margin-top: 8px; padding-left: 18px; color: var(--text-secondary); font-size: 0.9rem; }
        .tl-content li { margin-bottom: 4px; }
        .tl-content .change-cat { font-weight: 600; color: var(--text); margin-top: 8px; }

        /* 里程碑卡片 */
        .milestone-grid {
            display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px;
            margin-top: 24px;
        }
        .milestone-card {
            background: var(--surface); border-radius: var(--radius-lg); padding: 22px;
            border-left: 4px solid var(--primary); box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .milestone-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
        .milestone-card .version { font-weight: 800; color: var(--primary-deep); }
        .milestone-card p { color: var(--text-secondary); font-size: 0.9rem; margin-top: 8px; }

        /* 升级建议表格 */
        .upgrade-table { width: 100%; border-collapse: collapse; background: var(--surface); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); }
        .upgrade-table th { background: #F8FAFC; text-align: left; padding: 14px 18px; font-weight: 700; border-bottom: 2px solid var(--border); }
        .upgrade-table td { padding: 12px 18px; border-bottom: 1px solid var(--border-light); color: var(--text-secondary); }
        .upgrade-table tr:last-child td { border-bottom: none; }

        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; }
        .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; }
        .footer-section ul li a:hover { color: #E2E8F0; text-decoration: underline; }
        .footer-legal { border-top: 1px solid #334155; padding-top: 20px; text-align: center; font-size: 0.8rem; color: #64748B; line-height: 1.8; }

        @media (max-width: 768px) {
            .header-box { flex-direction: column; height: auto; padding: 12px 16px; }
            .page-hero h1 { font-size: 1.9rem; }
            section h2 { font-size: 1.5rem; }
            .section-inner { padding: 36px 16px; }
            .tl-card { flex-direction: column; }
        }