.mx-launch{margin:32px 0}.mx-feature-grid,.mx-lab-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.mx-feature{display:block;background:var(--card);border:1px solid var(--line);border-radius:13px;padding:24px;color:var(--ink);transition:border-color .15s,transform .15s}.mx-feature:hover{border-color:var(--teal);transform:translateY(-2px)}.mx-feature h3{font-size:19px;margin:12px 0}.mx-feature p{font-size:14px;color:var(--muted);line-height:1.7}.mx-feature strong{font-size:13px;color:var(--teal)}.mx-feature-icon{font-size:26px;color:var(--teal)}.mx-toolbar{display:grid;grid-template-columns:2fr 1fr 1fr;gap:14px;margin:24px 0}.mx-toolbar label{font-size:12px;font-weight:600;display:flex;flex-direction:column;gap:6px}.mx-toolbar input,.mx-toolbar select{width:100%;min-width:0;font:inherit;font-size:14px;padding:12px;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:9px}.mx-level{display:inline-grid;place-items:center;flex:0 0 38px;width:38px;height:38px;border-radius:10px;font-size:15px;font-weight:700;background:var(--light);color:var(--teal)}.mx-level-B{background:#f7efdb;color:#896b20}.mx-level-C{background:#eae7f4;color:#665086}.mx-problem-row h3{margin-top:5px}.mx-problem-row .tiny{color:var(--muted);font-size:10px;letter-spacing:.5px}.mx-solve-layout{display:grid;grid-template-columns:minmax(0,1fr) 275px;gap:24px;align-items:start}.mx-solve-layout>div{min-width:0}.mx-help-rail{position:sticky;top:20px;max-height:calc(100vh - 40px);overflow:auto}.mx-help-rail .panel{margin-top:0}.mx-help-rail h2{font-size:19px}.mx-help-rail p{font-size:14px}.mx-help-rail .btn{width:100%;font-size:12px;padding:10px}.mx-statement p{font-size:18px;line-height:1.85}.mx-givens{display:grid;grid-template-columns:1fr 1fr;gap:18px;border-top:1px solid var(--line);padding-top:16px;margin-top:18px}.mx-givens p{font-size:14px;margin:8px 0}.mx-givens strong{font-size:12px;color:var(--teal)}#mx-sketch{width:100%;height:auto;display:block;background-color:#fffefa;background-image:linear-gradient(#edf0e8 1px,transparent 1px),linear-gradient(90deg,#edf0e8 1px,transparent 1px);background-size:20px 20px;border:1px solid var(--line);border-radius:9px;touch-action:none;cursor:crosshair}.mx-row{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:12px}.mx-row input{min-width:0;max-width:180px}.mx-stage{display:flex;align-items:flex-start;gap:18px}.mx-stage>div{min-width:0;width:100%}.mx-stage-number{display:grid;place-items:center;background:var(--light);color:var(--teal);width:30px;height:30px;flex:0 0 30px;border-radius:50%;font-size:14px}.mx-stage h2{font-size:22px;margin:2px 0 10px}.mx-stage p{font-size:14px;color:var(--muted)}.mx-stage textarea{display:block;width:100%;box-sizing:border-box;font:inherit;font-size:15px;line-height:1.65;resize:vertical;border:1px solid var(--line);border-radius:9px;background:var(--paper);color:var(--ink);padding:13px}.mx-stage textarea:focus{outline:2px solid #9fc0b4;outline-offset:2px}.mx-hint{border-left:2px solid var(--gold);padding-left:13px;margin-bottom:18px}.mx-hint b{font-size:12px;color:var(--teal)}.mx-hint p{margin-top:5px}.mx-card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.mx-formula-card{display:block;background:var(--card);border:1px solid var(--line);padding:24px;border-radius:12px;color:var(--ink);min-width:0}.mx-formula-card:hover{border-color:var(--teal)}.mx-formula-card h2{font-size:23px;margin:12px 0}.mx-formula-card p{font-size:14px;color:var(--muted)}.mx-formula-card strong{font-size:13px;color:var(--teal)}.mx-formula-card .math.block{font-size:16px}.mx-table-wrap{overflow:auto;max-width:100%;margin:18px 0}.mx-table{width:100%;border-collapse:collapse;font-size:14px;text-align:left}.mx-table th,.mx-table td{padding:12px 16px;border-bottom:1px solid var(--line)}.mx-table th{background:var(--light);font-size:12px}.mx-card-equation .math.block{font-size:23px;padding:28px 15px}.mx-boundary{background:#f8f0e1;border:1px solid #eee1c3;border-radius:9px;padding:22px;margin:25px 0}.mx-boundary h2{font-size:21px}.mx-boundary p{margin-bottom:0}.bottom-nav a{flex:1 0 18%;min-width:54px}.desktop-nav{max-height:calc(100vh - 310px);overflow-y:auto}.mx-lab-grid .mx-feature h2{font-size:24px}
@media(max-width:1100px){.mx-solve-layout{grid-template-columns:minmax(0,1fr)}.mx-help-rail{position:static;max-height:none;display:grid;grid-template-columns:1fr 1fr;gap:16px;overflow:visible}.mx-help-rail .panel:last-child{grid-column:1/-1}.mx-feature-grid{grid-template-columns:1fr}.mx-feature-icon{float:right}.mx-feature h3{margin-top:0}.mx-lab-grid{grid-template-columns:1fr}}
@media(max-width:760px){.mx-toolbar{grid-template-columns:1fr 1fr;gap:12px}.mx-toolbar label:first-child{grid-column:1/-1}.mx-card-grid{grid-template-columns:1fr}.mx-formula-card{padding:21px}.mx-help-rail{grid-template-columns:1fr;gap:0}.mx-statement p{font-size:16px}.mx-stage{padding:18px 14px;gap:10px}.mx-stage-number{width:25px;height:25px;flex-basis:25px}.mx-stage h2{font-size:20px}.mx-stage textarea{font-size:16px}.mx-givens{grid-template-columns:1fr;gap:7px}.mx-card-equation .math.block{font-size:19px}.mx-table th,.mx-table td{padding:10px}.mx-problem-row{gap:12px;padding:17px 14px}.mx-problem-row h3{font-size:16px}.mx-launch .section-head h2{font-size:25px}.mx-stages .panel{margin:14px 0}.mx-solve-layout{gap:0}.mx-help-rail{order:2}.mx-row .btn{flex:0 0 auto}.mx-lab-grid .mx-feature{padding:22px}}