/* 课堂投屏优化：更大的观察画布与更宽松的控制范围 */
.experiment-layout{grid-template-columns:minmax(0,1fr) 320px}
.graph-panel{min-height:560px;padding:20px}
.graph-panel canvas{height:520px}
.graph-tip{bottom:30px;left:34px}
.ready-chapter{color:#315fbe}
.resample-button{border:1px solid #cbd9f5;background:#f5f8ff;color:#315fbe;border-radius:8px;padding:8px 12px;cursor:pointer;font:inherit;margin-top:4px}
.resample-button:hover{background:#eaf1ff}
@media(max-width:900px){.graph-panel{min-height:470px}.graph-panel canvas{height:430px}}
@media(max-width:640px){.experiment-layout{grid-template-columns:1fr}.graph-panel{min-height:380px;padding:13px}.graph-panel canvas{height:350px}}