:root{--bg:#f6f7f9;--card:#fff;--border:#e3e6ea;--text:#1c2330;--muted:#6b7280;--accent:#2563eb;--accent-weak:#eff4ff;--answer-bg:#f3f7ff;--danger:#b91c1c;--correct:#15803d}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Kaku Gothic ProN,Hiragino Sans,Meiryo,sans-serif;font-size:16px;line-height:1.6}a{color:var(--accent)}.wrap{max-width:760px;margin:0 auto;padding:16px 16px 160px}.header{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:var(--bg);padding:14px 0 10px;border-bottom:1px solid var(--border)}.header h1{font-size:18px;margin:0}.header .label{color:var(--muted);font-size:13px;margin-top:2px}.badge{display:inline-block;font-size:12px;padding:2px 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