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.btn{flex:1}.qb .tile{min-width:44px;height:46px;font-size:19px}.qb .pmat .top,.qb .slot{min-width:34px}.qb .pmat{gap:6px 3px;padding:6px 13px;font-size:19px}}@media (prefers-reduced-motion: reduce){.qb,.qb *,.qb:before,.qb *:before,.qb:after,.qb *:after{animation:none!important;transition:none!important}.qb .untangle path{stroke-dashoffset:0}}.qb.standalone{height:100%}.qb.embedded{scroll-margin-top:70px;background:transparent}.qb.embedded .home{display:block;max-width:none;padding:0}.qb.embedded .map{gap:30px}.qb.embedded .unit-sec{scroll-margin-top:70px}.qb .ebar-wrap{display:flex;flex-direction:column;gap:12px;margin-bottom:26px}.qb .ebar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 18px;padding:10px 14px;border:1px solid var(--rule);border-radius:var(--r);background:var(--paper)}.qb .ebar .stats{margin-left:0;flex-wrap:wrap}.qb .ebar-actions{display:flex;align-items:center;gap:4px}.qb .stat.today small{margin-right:2px}.qb .lesson.inline{height:auto;scroll-margin-top:70px;border:1px solid var(--rule);border-radius:var(--r);background:var(--bg)}.qb .lesson.inline .lesson-body{overflow:visible}.qb .lesson.inline .lesson-foot{position:sticky;bottom:0;z-index:5;border-radius:0 0 var(--r) var(--r)}.qb .lesson.inline .result{min-height:420px}.qb .beta{display:inline-flex;align-items:baseline;gap:4px;padding:1px 7px;border:1px solid var(--accent);border-radius:3px;color:var(--accent-dark);font:italic 400 15px/1.3 "KaTeX_Math",var(--font-text);white-space:nowrap}.qb .beta span{font:700 10px/1 var(--font-head);font-style:normal;letter-spacing:.1em;text-transform:uppercase}.qb .ebar-teach{display:flex;flex-wrap:wrap;align-items:center;gap:8px 22px;padding:0 4px}.qb .quick{display:inline-flex;align-items:center;gap:8px;font:600 13px/1.2 var(--font-head);color:var(--text);cursor:pointer}.qb .transfer{display:flex;flex-direction:column;gap:8px;padding-top:10px;border-top:1px solid var(--rule)}.qb .transfer 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