:root {
            --primary-color: rgb(107, 114, 128);
            --primary-dark: #4b5563;
            --primary-light: #9ca3af;
            --accent-color: #d97706;
            --bg-color: #f9fafb;
            --text-main: #1f2937;
            --text-muted: #6b7280;
            --card-bg: #ffffff;
            --border-color: rgba(107, 114, 128, 0.2);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', sans-serif; background-color: var(--bg-color); color: var(--text-main); line-height: 1.8; }
        a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
        ul { list-style: none; }
        .container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }
        
        header { background: var(--card-bg); box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 100; border-bottom: 2px solid var(--primary-color); }
        .header-inner { display: flex; justify-content: space-between; align-items: center; height: 80px; }
        .logo { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
        .logo img { display: block; height: 45px; width: auto; max-width: 180px; object-fit: contain; flex-shrink: 0; }
        .logo span { display: inline-block; font-size: 22px; font-weight: 800; line-height: 1; color: var(--text-main); white-space: nowrap; }
        .desktop-nav { display: flex; gap: 30px; }
        .desktop-nav a { font-size: 16px; font-weight: 500; padding: 10px 0; }
        .desktop-nav a:hover { color: var(--accent-color); }
        .menu-toggle { display: none; font-size: 24px; cursor: pointer; color: var(--primary-dark); }
        
        .mobile-drawer { position: fixed; top: 0; left: -300px; width: 280px; height: 100%; background: #1f2937; color: #fff; z-index: 1000; transition: left 0.3s ease; padding: 20px; display: flex; flex-direction: column; }
        .mobile-drawer.active { left: 0; }
        .drawer-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 999; display: none; opacity: 0; }
        .drawer-overlay.active { display: block; opacity: 1; }
        .drawer-close { align-self: flex-end; font-size: 28px; cursor: pointer; margin-bottom: 20px; }
        .mobile-nav a { font-size: 18px; padding: 12px; border-bottom: 1px solid rgba(255,255,255,0.1); display: block; }
        .drawer-logo .logo span { color: #fff; }

        
        .breadcrumb { padding: 20px 0; font-size: 14px; color: var(--text-muted); }
        .breadcrumb a { color: var(--primary-dark); }
        .breadcrumb a:hover { color: var(--accent-color); }

        .article-wrapper { background: #fff; border-radius: 12px; padding: 40px; box-shadow: 0 5px 20px rgba(0,0,0,0.03); margin-bottom: 40px; border: 1px solid var(--border-color); }
        .article-header { border-bottom: 1px solid var(--border-color); padding-bottom: 20px; margin-bottom: 30px; text-align: center; }
        .article-header h1 { font-size: 32px; color: var(--text-main); margin-bottom: 15px; line-height: 1.4; }
        .article-meta { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; font-size: 14px; color: var(--text-muted); }
        .article-meta span { display: inline-flex; align-items: center; gap: 5px; }

        .article-body { font-size: 16px; color: #374151; overflow-wrap: break-word; }
        .article-body p { margin-bottom: 20px; text-align: justify; }
        .article-body img { max-width: 100%; height: auto; border-radius: 8px; margin: 20px auto; display: block; }
        .article-body h2, .article-body h3 { margin: 30px 0 15px; color: var(--primary-dark); border-left: 4px solid var(--accent-color); padding-left: 10px; }

        .article-tags { margin-top: 40px; padding-top: 20px; border-top: 1px dashed var(--border-color); display: flex; gap: 10px; align-items: center; flex-wrap: wrap;}
        .article-tags strong { font-size: 14px; color: var(--text-muted); }
        .article-tags a { background: rgba(217, 119, 6, 0.1); color: var(--accent-color); padding: 4px 12px; border-radius: 4px; font-size: 14px; }
        .article-tags a:hover { background: var(--accent-color); color: #fff; }

        .article-nav { display: flex; justify-content: space-between; margin-top: 30px; padding: 20px; background: var(--bg-color); border-radius: 8px; border: 1px solid var(--border-color); }
        .article-nav a { font-size: 15px; font-weight: 500; color: var(--primary-dark); max-width: 45%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: block; }
        .article-nav a:hover { color: var(--accent-color); }

        .related-box { margin-bottom: 60px; }
        .related-title { font-size: 24px; margin-bottom: 20px; color: var(--text-main); position: relative; padding-left: 15px; }
        .related-title::before { content: ''; position: absolute; left: 0; top: 4px; bottom: 4px; width: 4px; background: var(--accent-color); border-radius: 2px; }
        .related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
        .related-card { background: #fff; border: 1px solid var(--border-color); border-radius: 8px; overflow: hidden; transition: transform 0.3s; }
        .related-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
        .related-card img { width: 100%; height: 140px; object-fit: cover; }
        .related-card h4 { font-size: 16px; padding: 15px; margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; line-height: 1.4;}

        .download-cta { background: linear-gradient(135deg, var(--primary-dark), #1f2937); padding: 30px; border-radius: 12px; text-align: center; color: #fff; margin-top: 40px; box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
        .download-cta h3 { font-size: 24px; margin-bottom: 10px; }
        .download-cta p { color: #d1d5db; margin-bottom: 20px; }
        .download-cta .btn { display: inline-block; background: var(--accent-color); color: #fff; padding: 12px 30px; border-radius: 6px; font-weight: bold; font-size: 18px; }

        footer { background: #111827; color: #9ca3af; padding: 60px 0 20px; font-size: 14px; }
        .footer-logo .logo span { color: #fff; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-title { color: #fff; font-size: 16px; font-weight: bold; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 2px solid var(--accent-color); display: inline-block; }
        .footer-links li { margin-bottom: 10px; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; }
        .footer-extra-links a { margin: 0 10px; color: #6b7280; }

        @media (max-width: 992px) {
            .desktop-nav { display: none; }
            .menu-toggle { display: block; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .article-wrapper { padding: 20px; }
            .article-header h1 { font-size: 24px; }
            .article-nav { flex-direction: column; gap: 15px; text-align: center; }
            .article-nav a { max-width: 100%; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
        }