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button>span{font-size:8px}.study-controls kbd{display:none}.study-card:has(.neuron-diagram){padding-inline:9px}.diagram-question{font-size:14px}.study-complete h3{font-size:29px}}.sample-occlusion{max-width:320px;margin:20px auto 0}.sample-occlusion-image{border-radius:var(--radius-lg);position:relative;overflow:hidden}.sample-occlusion-image img{width:100%;height:auto;display:block}.sample-occlusion-mask{color:var(--text-primary);background:var(--surface-overlay);border:2px solid var(--control-border);border-radius:4px;place-items:center;font-weight:600;display:grid;position:absolute}.sample-occlusion-mask.is-revealed{border-color:var(--brand);background:0 0}.sample-occlusion figcaption{color:var(--text-primary);text-align:center;margin-top:12px;font-size:16px}