.breadcrumb{color:var(--text-muted);border-bottom:1px solid var(--border);padding:16px 48px;font-size:13px}.breadcrumb a{color:var(--text-muted);text-decoration:none}.breadcrumb a:hover{color:var(--l3)}.breadcrumb span{margin:0 8px}.section-kn{border-top:1px solid var(--border);margin:32px 0;padding-top:32px}.luan-wrap{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin:16px 0;padding:24px}.luan-wrap .tien-de{gap:14px;margin-bottom:12px;display:flex}.luan-wrap .tien-de .so{color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;min-width:32px;height:32px;font-size:13px;font-weight:900;display:flex}.luan-wrap .tien-de .noi-dung{padding-top:4px}.luan-wrap .tien-de .tieu-de{margin-bottom:4px;font-size:13px;font-weight:700}.luan-wrap .tien-de .mo-ta{color:var(--text-muted);font-size:13px;line-height:1.7}.luan-wrap .ket-luan{border-radius:var(--radius-sm);background:#9b59b614;border:1px solid #9b59b64d;margin-top:12px;padding:14px 18px}.luan-wrap .ket-luan .ket-luan-ten{color:var(--l3);letter-spacing:1px;margin-bottom:6px;font-size:12px;font-weight:700}.luan-wrap .ket-luan .ket-luan-nd{font-size:14px;font-weight:600;line-height:1.6}.phan-bien-grid{flex-direction:column;gap:12px;margin:16px 0;display:flex}.phan-bien-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}.phan-bien-header{gap:0;display:flex}.phan-bien-cot{flex:1;padding:14px 16px}.phan-bien-cot.phan{border-right:1px solid var(--border)}.pb-label{letter-spacing:1px;margin-bottom:6px;font-size:10px;font-weight:700}.pb-text{font-size:13px;line-height:1.6}.so-sanh-wrap{border:1px solid var(--border);border-radius:var(--radius);grid-template-columns:1fr auto 1fr;align-items:stretch;gap:0;margin:20px 0;display:grid;overflow:hidden}.ss-cot{padding:20px}.ss-cot.phat{border-right:1px solid var(--border);background:#9b59b60d}.ss-cot.descartes{background:#3498db0d}.ss-giua{background:var(--bg-secondary);border-left:1px solid var(--border);border-right:1px solid var(--border);writing-mode:vertical-rl;min-width:50px;color:var(--text-muted);letter-spacing:2px;justify-content:center;align-items:center;padding:0 8px;font-size:11px;font-weight:700;display:flex}.ss-ten{margin-bottom:6px;font-size:15px;font-weight:900}.ss-quote{color:var(--text-muted);border-left:3px solid var(--border);margin-bottom:12px;padding-left:10px;font-size:13px;font-style:italic;line-height:1.6}.ss-diem{color:var(--text-muted);gap:6px;margin-bottom:5px;font-size:12px;display:flex}.ss-diem span{color:var(--text)}.than-kinh-grid{grid-template-columns:1fr 1fr;gap:12px;margin:16px 0;display:grid}.tk-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px}.tk-card .tk-ten{color:var(--l3);margin-bottom:6px;font-size:13px;font-weight:700}.tk-card .tk-nc{color:var(--text-muted);margin-bottom:8px;font-size:12px;font-style:italic}.tk-card .tk-nd{color:var(--text-muted);font-size:13px;line-height:1.6}.tk-card .tk-ket{color:var(--l2);margin-top:8px;font-size:12px;font-weight:600}.thu-nghiem-flow{flex-direction:column;gap:0;margin:16px 0;display:flex;position:relative}.thu-nghiem-flow:before{content:"";background:linear-gradient(to bottom, var(--l3), var(--l2));width:2px;position:absolute;top:40px;bottom:40px;left:22px}.tn-step{gap:14px;padding-bottom:12px;display:flex;position:relative}.tn-step:last-child{padding-bottom:0}.tn-so{background:var(--l3);color:#fff;z-index:1;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;font-size:14px;font-weight:900;display:flex}.tn-nd{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);flex:1;padding:12px 16px}.tn-nd h4{margin-bottom:4px;font-size:13px}.tn-nd p{color:var(--text-muted);margin:0;font-size:12px;line-height:1.6}.tn-nd .tn-ket{color:var(--l3);margin-top:6px;font-size:12px;font-weight:600}.hieu-sai-wrap{border-radius:var(--radius);background:#e74c3c0d;border:1px solid #e74c3c33;margin:16px 0;padding:20px}.hieu-sai-tieu-de{color:#e74c3c;margin-bottom:12px;font-size:14px;font-weight:700}.hieu-sai-list{flex-direction:column;gap:10px;display:flex}.hs-item{border-radius:var(--radius-sm);border:1px solid #e74c3c26;grid-template-columns:auto 1fr 1fr;gap:0;display:grid;overflow:hidden}.hs-icon{background:#e74c3c1a;justify-content:center;align-items:center;width:44px;font-size:18px;display:flex}.hs-sai{border-right:1px solid #e74c3c26;padding:10px 14px}.hs-dung{background:#27ae600a;padding:10px 14px}.hs-label{letter-spacing:1px;margin-bottom:3px;font-size:10px;font-weight:700}.hs-nd{color:var(--text-muted);font-size:12px;line-height:1.5}.cau-hoi-btn{flex-wrap:wrap;gap:8px;margin:16px 0;display:flex}.cq-btn{border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-card);color:var(--text-muted);cursor:pointer;transition:var(--transition);padding:8px 16px;font-size:13px}.cq-btn:hover,.cq-btn.chon{border-color:var(--l3);color:var(--l3);background:#9b59b614}.cq-tra-loi{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-muted);margin-top:8px;padding:16px;font-size:13px;line-height:1.7;display:none}.cq-tra-loi.hien{display:block}@media (width<=900px){.breadcrumb{padding:14px 20px}.than-kinh-grid,.so-sanh-wrap{grid-template-columns:1fr}.ss-giua{writing-mode:horizontal-tb;border:none;border-top:1px solid var(--border);border-bottom:1px solid var(--border);min-width:auto;padding:8px}.hs-item{grid-template-columns:auto 1fr}.hs-dung{display:none}}