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.3rem;font-size:1.05rem;color:var(--primary)}.concept-one{font-size:1.1rem}.concept-like{background:var(--bg-alt);border-radius:12px;padding:.7rem 1rem}.concept-steps{padding-left:1.4rem;margin:0 0 1rem}.concept-steps li{padding:.15rem 0}.quick-check{margin-top:1.2rem;padding-top:1rem;border-top:2px dashed var(--control-border)}.qc-q{font-weight:700}.qc-options{display:grid;gap:.5rem;margin:.6rem 0}.qc-option{text-align:left;min-height:48px;padding:.6rem 1rem;border:2px solid var(--control-border);border-radius:12px;background:var(--surface);color:var(--text);font:inherit;cursor:pointer}.qc-option:hover:not(:disabled){border-color:var(--primary)}.qc-option[data-state=correct]{border-color:#1a7f37;background:#1a7f3726}.qc-option[data-state=wrong]{border-color:#b3261e;background:#b3261e26}.qc-option[data-state=correct]:after{content:" ✔ correct";font-weight:700}.qc-option[data-state=wrong]:after{content:" ✖ not this one";font-weight:700}:root[data-theme=dark] 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