:root{--primary:#2563eb;--primary-dark:#1d4ed8;--bg:#f8fafc;--card:#fff;--text:#1e293b;--text-light:#64748b;--border:#e2e8f0;--warning:#f59e0b}
        *{margin:0;padding:0;box-sizing:border-box}
        body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
        a{text-decoration:none;color:var(--primary)}a:hover{color:var(--primary-dark)}
        header{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
        .nav-container{max-width:1200px;margin:0 auto;padding:0 1rem;display:flex;align-items:center;justify-content:space-between;height:60px}
        .logo{font-size:1.25rem;font-weight:700;color:var(--primary)}
        nav ul{display:flex;list-style:none;gap:2rem}
        nav a{color:var(--text);font-weight:500;font-size:.95rem}
        nav a:hover{color:var(--primary)}
        .mobile-menu-btn{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text)}
        main{max-width:800px;margin:0 auto;padding:2rem 1rem;min-height:calc(100vh - 200px)}
        .breadcrumb{font-size:.85rem;color:var(--text-light);margin-bottom:1.5rem}
        .breadcrumb a{color:var(--text-light)}.breadcrumb a:hover{color:var(--primary)}.breadcrumb span{margin:0 .5rem;color:#cbd5e1}
        .article-header{margin-bottom:2rem}
        .article-tag{display:inline-block;background:#eff6ff;color:var(--primary);font-size:.8rem;padding:.35rem .9rem;border-radius:999px;margin-bottom:.75rem;font-weight:500}
        .article-header h1{font-size:1.75rem;line-height:1.4;margin-bottom:1rem}
        .article-meta{display:flex;gap:1.5rem;color:var(--text-light);font-size:.9rem;flex-wrap:wrap}
        .article-meta span{display:flex;align-items:center;gap:.4rem}
        .article-content{background:var(--card);border-radius:12px;padding:2rem;box-shadow:0 1px 3px rgba(0,0,0,.1);border:1px solid var(--border);margin-bottom:2rem}
        .article-content h2{font-size:1.35rem;margin:2rem 0 1rem;color:var(--text);padding-bottom:.5rem;border-bottom:2px solid var(--bg)}
        .article-content h2:first-child{margin-top:0}
        .article-content h3{font-size:1.1rem;margin:1.5rem 0 .75rem;color:var(--primary)}
        .article-content p{margin-bottom:1rem;line-height:1.8;color:var(--text)}
        .article-content ul,.article-content ol{padding-left:1.5rem;margin-bottom:1rem}
        .article-content li{margin-bottom:.5rem;line-height:1.7}
        .article-content strong{color:var(--text)}
        .tip-box{background:#eff6ff;border-left:4px solid var(--primary);padding:1rem 1.25rem;border-radius:0 8px 8px 0;margin:1.5rem 0}
        .tip-box p:last-child{margin-bottom:0}
        .warning-box{background:#fffbeb;border-left:4px solid var(--warning);padding:1rem 1.25rem;border-radius:0 8px 8px 0;margin:1.5rem 0}
        .warning-box p:last-child{margin-bottom:0}
        .factor-card{background:var(--bg);border-radius:10px;padding:1.25rem;margin-bottom:1rem}
        .factor-card h4{color:var(--primary);margin-bottom:.5rem;font-size:1rem}
        .factor-card p{margin-bottom:0;font-size:.95rem}
        .cta-box{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;border-radius:12px;padding:2rem;text-align:center;margin:2rem 0}
        .cta-box h3{color:#fff;margin-bottom:.5rem;font-size:1.25rem}
        .cta-box p{color:rgba(255,255,255,.9);margin-bottom:1.25rem}
        .cta-btn{display:inline-block;background:#fff;color:var(--primary);padding:.75rem 2rem;border-radius:8px;font-weight:600;font-size:1rem}
        .cta-btn:hover{background:#f8fafc}
        .related-section{margin-top:2rem}
        .related-section h2{font-size:1.25rem;margin-bottom:1rem}
        .related-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
        .related-card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:1.25rem;transition:box-shadow .2s}
        .related-card:hover{box-shadow:0 4px 12px rgba(0,0,0,.08)}
        .related-card h3{font-size:1rem;margin-bottom:.5rem;color:var(--text)}
        .related-card h3:hover{color:var(--primary)}
        .related-card p{font-size:.85rem;color:var(--text-light);line-height:1.6;margin-bottom:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
        .mobile-nav{display:none;position:absolute;top:60px;left:0;right:0;background:var(--card);border-bottom:1px solid var(--border);padding:1rem}
        .mobile-nav.active{display:block}
        .mobile-nav a{display:block;padding:.75rem;color:var(--text);border-bottom:1px solid var(--bg)}
        footer{background:var(--card);border-top:1px solid var(--border);padding:2rem 1rem}
        .footer-content{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}
        .footer-links{display:flex;gap:1.5rem}
        .footer-links a{color:var(--text-light);font-size:.9rem}
        .footer-links a:hover{color:var(--primary)}
        .copyright{color:var(--text-light);font-size:.9rem}
        @media(max-width:768px){nav ul{display:none}.mobile-menu-btn{display:block}.article-header h1{font-size:1.4rem}.article-content{padding:1.5rem}.related-grid{grid-template-columns:1fr}.footer-content{flex-direction:column;text-align:center}}