:root{--bg:#f9fafb;--fg:#111827;--card:#fff;--muted:#6b7280;--border:#e5e7eb;--shadow:0 4px 12px rgba(0,0,0,.06);--primary:#2563eb;--good:#059669;--bad:#dc2626}body,html{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:Noto Sans JP,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;line-height:1.5}.card,.container{padding:20px}.card{background:var(--card);border:1px solid var(--border);border-radius:10px;max-width:880px;margin:20px auto;box-shadow:var(--shadow)}.qtitle{font-size:20px;font-weight:800;margin:6px 0 12px}.optlist{margin-bottom:16px}.option{display:block;margin-bottom:8px;padding:10px 12px;border:1px solid var(--border)}.btn,.option{border-radius:8px}.btn{padding:10px 14px;cursor:pointer;border:1px solid #cbd5e1;background:#f3f4f6}.btn.primary{background:var(--primary);color:#fff;border:none}.answer-line{margin-top:6px}.is-correct{color:var(--good);font-weight:700}.is-wrong{color:var(--bad);font-weight:700}.answer-correct{color:inherit;font-weight:800}.muted{color:var(--muted)}.detail{max-width:880px;margin:0 auto}pre{background:#0f172a;color:#e5e7eb;padding:12px;border-radius:8px;overflow:auto}@keyframes spin{to{transform:rotate(1turn)}}.spinner{width:32px;height:32px;border:4px solid #e5e7eb;border-top:4px solid var(--primary);border-radius:50%;animation:spin 1s linear infinite;margin:0 auto 10px}.back-row{max-width:880px;margin:0 auto 12px}.progress{margin:0 0 12px}.progress-line{width:100%;height:8px;background:#e5e7eb;border-radius:999px;overflow:hidden}.progress-fill{height:100%;background:var(--primary)}.progress-text{margin-top:6px;font-size:12px;color:var(--muted);font-weight:600}.score-hero{display:flex;align-items:baseline;justify-content:center;gap:12px;margin:16px 0 10px;text-align:center}.score-value{font-size:72px;font-weight:900;line-height:1}.score-unit{font-size:24px;color:var(--muted);font-weight:700}.score-sub{color:var(--muted);font-size:15px;text-align:center}hr.explain-sep{border:none;border-top:1px solid var(--border);margin:20px 0}.explain-card{background:#fff;border:1px solid var(--border);border-radius:10px;padding:16px;box-shadow:var(--shadow)}.explain-head{display:flex;flex-direction:column;align-items:flex-start;gap:6px;margin-bottom:8px}.explain-title{margin:0;font-size:18px}.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:700}.badge-wrong{background:#fee2e2;color:#b91c1c;border:1px solid #fecaca}.kv{margin:8px 0 10px}.kv>div{display:grid;grid-template-columns:80px 1fr;grid-gap:6px 10px;gap:6px 10px;align-items:baseline;padding:4px 0}.kv dt{color:var(--muted);font-weight:700}.kv dd{margin:0}.answer-user{color:#374151}.answer-user-small{color:var(--muted);font-size:12px}.answer-correct-text{margin:4px 0 6px}.explain-body{margin-top:4px}.note{margin:8px 0;padding:10px 12px;border-radius:8px}.note-info{background:#eff6ff;color:#1e3a8a;border:1px solid #dbeafe}.note-warn{background:#fff7ed;color:#7c2d12;border:1px solid #ffedd5}.note-combined{background:#f8fafc;color:#0f172a;border:1px solid #e2e8f0}.option,dd,h1,h2,h3,h4,li,p{line-height:1.5}h2{margin-top:28px;margin-bottom:12px}h3{margin-top:20px;margin-bottom:10px}