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14px;display:grid}.challenge-eq{font-family:var(--font-display);font-weight:800;font-size:var(--fs-eq);letter-spacing:-.02em;color:var(--cream);line-height:1.1}.challenge-progress{font-size:var(--fs-small);color:var(--dim)}.challenge-steps{grid-column:1/-1;gap:6px;margin:6px 0 0;padding:0;list-style:none;display:flex}.challenge-steps li{background:var(--rule);border-radius:2px;flex:1;height:3px}.challenge-steps li.on{background:var(--brass)}.challenge-graph{border-bottom:1px solid var(--rule);flex-direction:column;gap:10px;min-height:0;padding:12px 14px 14px;display:flex}.challenge-legend{justify-content:space-between;align-items:center;gap:4px var(--gap);font-size:var(--fs-small);color:var(--dim);flex-wrap:wrap;display:flex}.challenge-keys{flex-wrap:wrap;gap:4px 16px;display:flex}.challenge-keys>span{align-items:center;display:flex}.challenge-keys .swatch{margin-right:7px}.challenge-units{font-family:var(--font-mono);font-size:var(--fs-micro)}.swatch{border-radius:5px;flex:none;width:1.4em;height:.8em;display:inline-block}.sw-a{background:var(--n2o4)}.sw-b{background:var(--no2)}.challenge-graph-canvas{flex:none;height:clamp(130px,24vh,280px);position:relative}.challenge-graph-canvas canvas{width:100%;height:100%;display:block;position:absolute;inset:0}.challenge-replay{width:100%;min-height:var(--tap);background:var(--panel-2);border:1px solid var(--rule);border-radius:var(--radius-inner);font-family:var(--font-body);font-size:var(--fs-body);color:var(--dim);cursor:pointer;justify-content:center;align-items:center;gap:8px;font-weight:700;transition:background .15s,color .15s;display:flex}.challenge-replay:hover{color:var(--cream);background:#2f4340}.challenge-replay:focus-visible{outline:2px solid var(--ok);outline-offset:2px}.challenge-answer{flex-direction:column;flex:none;gap:10px;padding:12px 14px 14px;display:flex}.challenge-options{border:0;flex-direction:column;gap:8px;margin:0;padding:0;display:flex}.challenge-prompt{font-size:var(--fs-body);color:var(--cream);padding:0 0 6px;line-height:1.5}.challenge-option{min-height:var(--tap);background:var(--bench);border:1px solid var(--rule);border-radius:var(--radius-inner);font-size:var(--fs-body);cursor:pointer;align-items:center;gap:12px;padding:8px 14px;transition:border-color .15s,background .15s;display:flex}.challenge-option:hover{background:var(--panel-2)}.challenge-option.on{border-color:var(--brass)}.challenge-option input{accent-color:var(--brass);flex:none;width:1.1em;height:1.1em}.challenge-hint{background:var(--panel-2);border-left:2px solid var(--brass);font-size:var(--fs-small);color:var(--dim);margin:0;padding:8px 12px}.challenge-cta{min-height:var(--tap);background:var(--brass);border:1px solid var(--brass);border-radius:var(--radius-inner);font-family:var(--font-body);font-size:var(--fs-body);color:var(--bench);cursor:pointer;padding:10px 16px;font-weight:700;transition:filter .15s,transform .1s}.challenge-cta:hover:not(:disabled){filter:brightness(1.08)}.challenge-cta:active:not(:disabled){transform:scale(.99)}.challenge-cta:disabled{border-color:var(--rule);color:var(--dim);cursor:not-allowed;background:0 0}.challenge-cta:focus-visible{outline:2px solid var(--ok);outline-offset:2px}.challenge-feedback{flex-direction:column;gap:12px;display:flex}.challenge-feedback p{font-size:var(--fs-body);color:#c4d1ce;margin:0}.challenge-feedback:focus{outline:none}@media (height<=620px){.challenge{padding-block:4px}.challenge-top,.challenge-title,.challenge-graph,.challenge-answer{padding-block:6px}.challenge-graph{gap:8px}.challenge-graph-canvas{height:clamp(78px,15vh,120px)}.challenge-option{min-height:38px;padding-block:5px}.challenge-replay,.challenge-cta{min-height:38px}}