.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(--l2)}.breadcrumb span{margin:0 8px}.section-kn{border-top:1px solid var(--border);margin:32px 0;padding-top:32px}.bon-tam-grid{grid-template-columns:1fr 1fr;gap:16px;margin:16px 0;display:grid}.bt-card{border-radius:var(--radius);border:1px solid var(--border);overflow:hidden}.bt-header{padding:20px 24px}.bt-so{letter-spacing:2px;opacity:.7;margin-bottom:6px;font-size:11px;font-weight:700}.bt-ten-viet{margin-bottom:2px;font-size:22px;font-weight:900}.bt-ten-pali{opacity:.8;margin-bottom:8px;font-size:13px}.bt-mo-ngan{opacity:.9;font-size:13px;line-height:1.6}.bt-body{background:var(--bg-secondary);padding:18px 24px}.bt-section{margin-bottom:12px}.bt-section:last-child{margin-bottom:0}.bt-section-ten{letter-spacing:1px;color:var(--text-muted);margin-bottom:6px;font-size:10px;font-weight:700}.bt-section-nd{color:var(--text-muted);font-size:12px;line-height:1.6}.bt-doi-luc{grid-template-columns:1fr 1fr;gap:8px;display:grid}.bt-doi-luc-item{background:var(--bg-card);border-radius:var(--radius-sm);padding:8px 10px;font-size:11px}.bt-doi-luc-item .dl-ten{letter-spacing:1px;margin-bottom:3px;font-size:9px;font-weight:700}.thien-huong-dan{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin:16px 0;padding:24px}.thien-chon{flex-wrap:wrap;gap:8px;margin-bottom:16px;display:flex}.thien-btn{border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-secondary);cursor:pointer;color:var(--text-muted);transition:var(--transition);padding:8px 18px;font-size:13px}.thien-btn.chon{color:#fff;border-color:#0000}.thien-nd{display:none}.thien-nd.hien{display:block}.thien-buoc{gap:12px;margin-bottom:10px;display:flex}.thien-so{color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;min-width:28px;height:28px;font-size:12px;font-weight:900;display:flex}.thien-buoc-nd h4{margin-bottom:4px;font-size:13px}.thien-buoc-nd p{color:var(--text-muted);margin:0;font-size:12px;line-height:1.6}.thien-buoc-nd .cau-chu{color:var(--l2);border-radius:var(--radius-sm);border-left:3px solid var(--l2);background:#27ae600f;margin-top:6px;padding:8px 12px;font-size:13px;font-style:italic}.tl-hoc-grid{grid-template-columns:1fr 1fr;gap:12px;margin:16px 0;display:grid}.tlh-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px}.tlh-ten{color:var(--l2);margin-bottom:6px;font-size:13px;font-weight:700}.tlh-phat{color:var(--text-muted);margin-bottom:8px;font-size:12px}.tlh-khoa-hoc{color:var(--l0);font-size:12px}.bai-tap-grid{grid-template-columns:1fr 1fr;gap:10px;margin:16px 0;display:grid}.bai-tap-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px}.bai-tap-card .bt-title{margin-bottom:6px;font-size:12px;font-weight:700}.bai-tap-card .bt-mo{color:var(--text-muted);font-size:12px;line-height:1.6}.metta-timer{text-align:center;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);margin:16px 0;padding:24px}.metta-phase-text{min-height:24px;color:var(--l2);margin:10px 0 4px;font-size:15px;font-weight:700}.metta-phrase{color:var(--text-muted);min-height:20px;font-size:13px;font-style:italic}.metta-progress{background:var(--bg-card);border-radius:3px;width:100%;height:6px;margin:12px 0;overflow:hidden}.metta-progress-bar{background:var(--l2);border-radius:3px;width:0%;height:100%;transition:width .5s linear}.metta-controls{justify-content:center;gap:8px;margin-top:12px;display:flex}.metta-btn{border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);border:none;padding:8px 20px;font-size:13px;font-weight:700}.metta-btn-start{background:var(--l2);color:#fff}.metta-btn-reset{background:var(--bg-card);color:var(--text);border:1px solid var(--border)}@media (width<=900px){.breadcrumb{padding:14px 20px}.bon-tam-grid{grid-template-columns:1fr}.tl-hoc-grid,.bai-tap-grid{grid-template-columns:1f}}