:root{--bg: #f4f5f7;--card: #ffffff;--text: #1a202c;--muted: #64748b;--border: #e2e8f0;--primary: #2563eb;--primary-text: #ffffff;--ok: #16a34a;--ok-bg: #dcfce7;--ng: #dc2626;--ng-bg: #fee2e2;--term: #2563eb}@media(prefers-color-scheme:dark){:root{--bg: #0f172a;--card: #1e293b;--text: #e2e8f0;--muted: #94a3b8;--border: #334155;--primary: #3b82f6;--ok: #4ade80;--ok-bg: #14532d;--ng: #f87171;--ng-bg: #7f1d1d;--term: #60a5fa}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Hiragino Sans,Hiragino Kaku Gothic ProN,Yu Gothic,sans-serif;line-height:1.7}main{max-width:720px;margin:0 auto;padding:12px}a{color:var(--primary)}.site-header{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:var(--card);border-bottom:1px solid var(--border)}.brand{font-weight:700;font-size:1.05rem;text-decoration:none;color:var(--text)}.account{display:flex;gap:12px;align-items:center}.tabs{display:flex;max-width:720px;margin:0 auto;padding:8px 12px 0;gap:6px;overflow-x:auto}.tabs a{padding:8px 14px;border-radius:8px 8px 0 0;text-decoration:none;color:var(--muted);white-space:nowrap;font-size:.95rem}.tabs a.active{background:var(--card);color:var(--text);font-weight:600;border:1px solid var(--border);border-bottom-color:var(--card)}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px;margin-bottom:16px}.card h2{margin-top:0}label{display:block;margin:14px 0;font-weight:600}select{display:block;width:100%;margin-top:6px;padding:10px;font-size:1rem;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text)}button,.button{font:inherit;cursor:pointer;border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:8px;padding:8px 16px;text-decoration:none;display:inline-block}button.primary,.button.primary{background:var(--primary);color:var(--primary-text);border-color:var(--primary);font-weight:600}button.big{width:100%;padding:14px;font-size:1.05rem;margin-top:8px}button.link{border:none;background:none;color:var(--primary);padding:0}.hint{color:var(--muted);font-size:.9rem}.attribution{color:var(--muted);font-size:.78rem;border-top:1px solid var(--border);padding-top:10px;margin-top:20px}.quiz-head{display:flex;justify-content:space-between;align-items:baseline;gap:8px;color:var(--muted);font-size:.9rem}.quiz-progress{font-weight:700;color:var(--text)}.quiz-body{white-space:pre-wrap;font-size:1.02rem}.choices{display:flex;flex-direction:column;gap:10px}.choice{display:flex;gap:10px;align-items:flex-start;text-align:left;padding:12px;line-height:1.6}.choice:not(:disabled):not(.correct):not(.wrong):not(.disabled):hover{border-color:var(--primary)}.choice-no{font-weight:700;flex-shrink:0;width:1.4em;height:1.4em;line-height:1.4em;text-align:center;border-radius:50%;background:var(--bg)}.choice.correct{border-color:var(--ok);background:var(--ok-bg)}.choice.wrong{border-color:var(--ng);background:var(--ng-bg)}.choice.disabled{opacity:.55}.choice.correct,.choice.wrong,.choice.disabled{cursor:default}.choice-item{display:flex;flex-direction:column}.choice-item .choice{width:100%}.choice-exp{margin:0 6px;padding:8px 12px;font-size:.88rem;background:var(--bg);border:1px solid var(--border);border-top:none;border-radius:0 0 8px 8px;border-left-width:3px}.choice-exp.ok{border-left-color:var(--ok)}.choice-exp.ng{border-left-color:var(--ng)}.quiz-point{margin-top:12px;padding:12px 14px;background:var(--bg);border-left:3px solid var(--primary);border-radius:6px;font-size:.92rem}.exp-note{display:block;margin-top:6px}.verdict{margin-top:16px;padding:14px;border-radius:8px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.verdict.ok{background:var(--ok-bg);color:var(--ok)}.verdict.ng{background:var(--ng-bg);color:var(--ng)}.score{font-size:1.2rem}.result-list{list-style:none;padding:0}.result-list li{padding:4px 0}.result-list .ok span{color:var(--ok);font-weight:700}.result-list .ng span{color:var(--ng);font-weight:700}button.term{border:none;background:none;padding:0;color:var(--term);text-decoration:underline dotted;text-underline-offset:3px;font:inherit;line-height:inherit}.term-popover{position:fixed;z-index:100;width:min(300px,calc(100vw - 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