.pr-intro{margin:8px 0 24px}.pr-intro p{color:var(--text);line-height:1.6}.pr-diff-section{margin:0 0 28px}.pr-diff-section .tp-section-heading{margin-bottom:12px}.pr-q{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:16px 18px;margin:0 0 14px}.pr-q-num{font-weight:700;color:var(--primary);margin:0 0 4px;font-size:.85rem}.pr-q-text{font-weight:600;color:var(--text);margin:0 0 12px;line-height:1.5}.pr-opts{list-style:none;margin:0;padding:0}.pr-opts-standalone{margin:8px 0 20px}.pr-opt{display:flex;align-items:baseline;gap:8px;padding:8px 12px;margin:6px 0;border:1px solid var(--border);border-radius:8px;color:var(--text);line-height:1.45}.pr-opt-letter{flex:0 0 auto;font-weight:700;color:var(--text-muted);min-width:1.2em}.pr-opts-standalone .pr-opt-correct{border-color:var(--success);background:color-mix(in srgb,var(--success) 10%,transparent)}.pr-opts-standalone .pr-opt-correct .pr-opt-letter{color:var(--success)}.pr-answer{margin-top:6px;border-top:1px dashed var(--border);padding-top:8px}.pr-answer summary{cursor:pointer;font-weight:600;color:var(--primary);list-style:none;padding:4px 0}.pr-answer summary::-webkit-details-marker{display:none}.pr-answer summary::before{content:"▸ "}.pr-answer[open] summary::before{content:"▾ "}.pr-answer-key{margin:8px 0 4px;color:var(--text);font-weight:600}.pr-explanation{margin:4px 0;color:var(--text-muted);line-height:1.55}.pr-answer-block{background:color-mix(in srgb,var(--success) 8%,var(--bg-card));border:1px solid var(--border);border-left:4px solid var(--success);border-radius:10px;padding:14px 18px;margin:8px 0 24px}.pr-answer-block .pr-answer-key{font-size:1.05rem}.pr-concept{border-top:1px solid var(--border);padding-top:16px;margin-top:8px}.pr-concept p{color:var(--text);line-height:1.6}.pr-related-q{margin:28px 0}.pr-related-q-list{padding-left:20px}.pr-related-q-list li{margin:8px 0;line-height:1.45}.pr-related-q-list a{color:var(--primary);text-decoration:none}.pr-related-q-list a:hover{text-decoration:underline}