.med-promo{border-color:#3b749d;background:linear-gradient(110deg,#0a2740,#081426 70%)}.math-question{max-width:850px;margin:auto;min-height:0}.math-question label{display:block;color:var(--muted);font-weight:600;margin-bottom:9px}.math-entry{display:flex;align-items:center;gap:12px;margin-bottom:20px}.math-entry input{background:#061321;border:1px solid #286080;color:white;padding:13px;font:600 1.4rem 'Chakra Petch';min-width:0;width:210px;border-radius:0}.math-entry input:focus{outline:2px solid var(--cyan)}.math-entry strong{color:var(--cyan)}.math-feedback{display:none;margin:20px 0;background:#0d2636;border-left:3px solid var(--cyan);padding:16px;color:#c8dce4;line-height:1.7}.math-feedback.visible{display:block}.math-feedback.correct{border-color:var(--lime)}.math-feedback.incorrect{border-color:var(--red)}.math-question #nextMath{margin-top:15px}.math-tip{max-width:850px;margin:15px auto}.math-tip p{color:var(--muted);line-height:1.5}.math-question button:disabled{opacity:.5;cursor:not-allowed}