.nav-inner { max-width: 1200px; margin: 0 auto; display: flex; }        .nav li:hover ul { opacity: 1; visibility: visible; transform: translateY(0); }

        .main-layout { max-width: 1200px; margin: 0 auto; padding: 30px 40px 60px; display: flex; gap: 32px; }
        .sidebar { width: 200px; flex-shrink: 0; }
        .sidebar-menu { background: #fff; border-radius: 10px; box-shadow: 0 2px 8px rgba(0,0,0,0.04); overflow: hidden; }
        .sidebar-menu .group-title { display: block; padding: 12px 20px; font-size: 14px; font-weight: 700; color: #1a1a2e; background: #f8f9fc; border-bottom: 1px solid #eee; cursor: pointer; position: relative; }
        .sidebar-menu .group-title::after { content: ''; position: absolute; right: 16px; top: 50%; width: 0; height: 0; border-left: 5px solid transparent; border-right: 5px solid transparent; border-top: 6px solid #999; margin-top: -3px; transition: transform .2s; }
        .sidebar-menu .group-title.open::after { transform: rotate(180deg); }
        .sidebar-menu .group-items { overflow: hidden; max-height: 0; transition: max-height .3s; }
        .sidebar-menu .group-items.open { max-height: 600px; }
        .sidebar-menu .group-items a { display: block; padding: 10px 20px 10px 32px; color: #666; text-decoration: none; font-size: 13px; border-bottom: 1px solid #f8f8f8; transition: all .15s; }
        .sidebar-menu .group-items a:hover, .sidebar-menu .group-items a.active { color: #e94560; background: #fdf2f4; }
        .sidebar-menu .group-items a:last-child { border-bottom: none; }
        .sidebar-menu .single-link { display: block; padding: 12px 20px; color: #555; text-decoration: none; font-size: 14px; font-weight: 700; border-bottom: 1px solid #eee; transition: all .15s; background: #f8f9fc; }
        .sidebar-menu .single-link:hover, .sidebar-menu .single-link.active { color: #e94560; background: #fdf2f4; }

        .content { flex: 1; min-width: 0; }
        .content-card { background: #fff; border-radius: 12px; box-shadow: 0 2px 12px rgba(0,0,0,0.04); padding: 36px 40px; }
        .content-card h1 { font-size: 26px; color: #1a1a2e; margin-bottom: 24px; padding-bottom: 16px; border-bottom: 2px solid #f0f0f0; }
        .article-body p { font-size: 15px; color: #555; line-height: 2; margin-bottom: 18px; text-indent: 2em; }
        .article-body h3 { font-size: 18px; color: #1a1a2e; margin: 28px 0 14px; }
        .article-body ul { margin-bottom: 18px; padding-left: 2em; }
        .article-body ul li { font-size: 15px; color: #555; line-height: 2; }
        .article-body strong { color: #333; }

        @media (max-width: 768px) {
            .main-layout { flex-direction: column; padding: 20px 16px; }
            .sidebar { width: 100%; }
            .content-card { padding: 20px 16px; }
        }