:root{--blue-50:#EFF6FF;--blue-100:#DBEAFE;--blue-200:#BFDBFE;--blue-500:#3B82F6;--blue-600:#2563EB;--blue-700:#1D4ED8;--blue-800:#1E40AF;--blue-900:#1E3A8A;--sky-50:#F0F9FF;--sky-400:#38BDF8;--sky-500:#0EA5E9;--green:#10B981;--amber:#F59E0B;--red:#EF4444;--text-dark:#0F2247;--text-mid:#334E7A;--text-light:#6B84A8;--shadow-sm:0 1px 3px rgba(30,64,175,.08);--shadow-md:0 4px 16px rgba(30,64,175,.12);--radius:14px;--radius-lg:22px}.topbar-link{display:flex;align-items:center;gap:6px;color:var(--blue-200);text-decoration:none;font-weight:500;direction:ltr}.logo-sub{font-size:11px;color:var(--text-light)}.nav-links a{padding:6px 14px;border-radius:8px;font-size:14px;font-weight:500;color:var(--text-mid);text-decoration:none;transition:background .2s,color .2s}.article-cat{display:inline-flex;align-items:center;gap:6px;background:var(--blue-100);color:var(--blue-700);padding:5px 14px;border-radius:50px;font-size:12px;font-weight:800;margin-bottom:18px}.answer-box{background:var(--blue-600);border-radius:var(--radius-lg);padding:28px 30px;margin-bottom:36px}.article-body>h2{font-size:clamp(20px,2.8vw,28px);font-weight:900;color:var(--text-dark);margin:48px 0 16px;padding-right:16px;border-right:4px solid var(--blue-600);line-height:1.3}.article-body ul,.article-body>ol{padding-right:24px;margin-bottom:18px}.article-body a{color:var(--blue-600);text-decoration:none;font-weight:600;border-bottom:1px solid var(--blue-200)}.article-body a:hover{border-color:var(--blue-600)}.info-box p,.info-box ul{font-size:14px;color:var(--text-mid);margin-bottom:0;line-height:1.7}.info-box li{font-size:14px;margin-bottom:5px}.stat-highlight{background:linear-gradient(135deg,var(--blue-600),var(--blue-800));border-radius:var(--radius);padding:24px 28px;margin:32px 0;display:flex;align-items:center;gap:20px}.sh-num{font-size:46px;font-weight:900;color:#fff;line-height:1;flex-shrink:0}.sh-text{font-size:15px;color:var(--blue-200);line-height:1.6}.practice-card{border:1px solid var(--blue-100);border-radius:var(--radius-lg);padding:24px;margin-bottom:16px;display:flex;gap:18px;transition:box-shadow .2s}.practice-card:hover{box-shadow:var(--shadow-md)}.pc-left{display:flex;flex-direction:column;align-items:center;gap:8px;flex-shrink:0}.pc-num{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:900;color:#fff}.pc-level{font-size:9px;font-weight:700;padding:2px 6px;border-radius:50px;text-align:center;white-space:nowrap}.lv-basic{background:#DCFCE7;color:#166534}.lv-advanced{background:#DBEAFE;color:var(--blue-700)}.lv-expert{background:#EDE9FE;color:#6D28D9}.pc-right h3{font-size:16px;font-weight:800;color:var(--text-dark);margin-bottom:7px}.pc-right p{font-size:14px;color:var(--text-mid);line-height:1.75;margin-bottom:10px}.pc-tip{font-size:12px;background:var(--sky-50);border-right:3px solid var(--blue-400);padding:8px 12px;border-radius:0 8px 8px 0;color:var(--text-mid)}.pc-wrong{font-size:12px;background:#FFF5F5;border-right:3px solid var(--red);padding:8px 12px;border-radius:0 8px 8px 0;color:#991B1B;margin-top:6px}.category-example{background:var(--sky-50);border:1px solid var(--blue-100);border-radius:var(--radius);padding:20px;margin:20px 0}.ce-title{font-size:14px;font-weight:800;color:var(--text-dark);margin-bottom:12px}.ce-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}.ce-tag{background:#fff;border:1px solid var(--blue-100);border-radius:8px;padding:8px 12px;font-size:12px;font-weight:700;color:var(--text-mid);text-align:center}.ce-tag span{display:block;font-size:10px;color:var(--text-light);font-weight:400;margin-top:3px}.comm-template{background:var(--text-dark);border-radius:var(--radius);padding:20px;margin:16px 0}.ct-label{font-size:10px;font-weight:700;color:#64748B;letter-spacing:.06em;margin-bottom:8px}.ct-msg{font-size:13px;color:#CBD5E1;line-height:1.7;font-family:monospace}.ct-msg span{color:#6EE7B7;font-weight:700}.weekly-review{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:24px 0}.wr-item{background:var(--sky-50);border:1px solid var(--blue-100);border-radius:var(--radius);padding:16px;text-align:center}.wr-icon{font-size:22px;margin-bottom:8px}.wr-title{font-size:12px;font-weight:800;color:var(--text-dark);margin-bottom:4px}.wr-desc{font-size:11px;color:var(--text-light);line-height:1.5}.cta-box p{font-size:15px;color:var(--blue-200);margin-bottom:24px}.cta-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.cb-w{background:#fff;color:var(--blue-700);padding:13px 28px;border-radius:10px;font-size:14px;font-weight:800;text-decoration:none;display:inline-flex;align-items:center;gap:7px;transition:all .2s}.cb-w:hover{transform:translateY(-2px)}.cb-g{background:rgb(255 255 255 / .15);border:2px solid rgb(255 255 255 / .4);color:#fff;padding:11px 24px;border-radius:10px;font-size:14px;font-weight:700;text-decoration:none;display:inline-flex;align-items:center;gap:7px}.tag{font-size:12px;background:var(--blue-50);color:var(--blue-700);padding:4px 12px;border-radius:50px;text-decoration:none}.toc-list li a{display:block;font-size:13px;color:var(--text-mid);text-decoration:none;padding:6px 0;border-bottom:1px solid var(--blue-50)}.toc-list li a:hover{color:var(--blue-600)}.ri-icon{width:38px;height:38px;background:var(--blue-50);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:17px;flex-shrink:0}.cta-sidebar p{font-size:12px;color:var(--blue-200);margin-bottom:14px}.cta-sidebar a{display:block;background:#fff;color:var(--blue-700);padding:11px;border-radius:9px;font-size:13px;font-weight:800;text-decoration:none}.footer-col a{display:block;font-size:13px;color:#64748B;text-decoration:none;margin-bottom:10px;transition:color .2s}@media(max-width:768px){.ce-grid{grid-template-columns:1fr 1fr}.weekly-review{grid-template-columns:1fr 1fr}.nav-links{display:none}.stat-highlight{flex-direction:column;text-align:center}}@media(max-width:600px){.footer-top{grid-template-columns:1fr}.cta-btns{flex-direction:column;align-items:center}}