.grade-two-shell .parameter,.grade-two-shell .timeline-control{grid-column:1/-1}
.grade-two-shell .parameter output{margin-left:.5rem;color:#087c86}
.grade-two-shell input[type=range]{min-height:40px;accent-color:#087c86}
.grade-two-shell button,.grade-two-shell select{min-height:44px}
.grade-two-shell .experiment-heading{align-items:start;flex-wrap:wrap}
.grade-two-shell .control-note,.grade-two-legend{font-size:1rem;line-height:1.8}
.grade-two-shell .keyword-hint{font-size:.875rem}
.grade-two-shell .small-action{font-size:.9rem}
.grade-two-scene{margin:16px 0;background:#f5fafb;border-radius:12px}
.grade-two-scene text{font:24px 'Yu Gothic',system-ui,sans-serif;fill:#315461}
.grade-two-readings{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:12px}
.grade-two-readings p{padding:12px;background:#e1f1e8;margin:0;line-height:1.7}
.grade-two-readings strong{display:block;font-size:1.2rem}
.grade-two-shell .lesson-nav{margin-top:24px;display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between}
.grade-two-shell .timeline-control p{font-size:1rem;line-height:1.7}
@media(max-width:560px){.grade-two-readings{grid-template-columns:1fr}.grade-two-shell .experiment-card{padding:10px}}