.classroom-qr-code{aspect-ratio:1;background:#fff;width:min(100%,20rem);height:auto;margin-inline:auto;display:block}.classroom-camera-preview{aspect-ratio:4/3;background:#15262f;border-radius:12px;max-height:65dvh;position:relative;overflow:hidden}.classroom-camera-preview video{object-fit:cover;width:100%;height:100%;display:block}.classroom-camera-start{place-items:center;display:grid;position:absolute;inset:0}.classroom-camera-controls{justify-content:space-between;align-items:center;gap:1rem;margin-top:1rem;display:flex}@media (max-width:600px){.classroom-camera-preview{aspect-ratio:3/4}.classroom-camera-controls{flex-wrap:wrap}}.classroom-teacher-settings{border-top:1px solid var(--line,#dce5eb);margin-top:1.5rem;padding-top:1rem;font-size:.875rem}.classroom-teacher-settings>summary{cursor:pointer;color:var(--muted,#617681)}.classroom-teacher-subject-row{border-bottom:1px solid var(--line,#dce5eb);flex-wrap:wrap;align-items:center;gap:1rem;padding:1rem 0;display:flex}.classroom-teacher-subject-row fieldset{border:0;flex:1;min-width:0;margin:0;padding:0}.classroom-teacher-subject-row fieldset>div{flex-wrap:wrap;gap:1rem;margin-top:.5rem;display:flex}.classroom-teacher-subject-row label{align-items:center;gap:.5rem;min-height:44px;display:flex}.classroom-teacher-subject-row p{width:100%;color:var(--danger,#a83e3e)}