:root{--bg: #f6f7f9;--surface: #ffffff;--border: #e2e5ea;--text: #1f2430;--muted: #6b7280;--accent: #2563eb;--correct-bg: #e8f6ec;--correct-border: #34a853;--correct-text: #1e7a36;font-family:system-ui,-apple-system,Segoe UI,Hiragino Kaku Gothic ProN,Noto Sans JP,Meiryo,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);line-height:1.7}.app-header{background:var(--surface);border-bottom:1px solid var(--border);padding:12px 20px;position:sticky;top:0;z-index:10}.app-title{font-size:16px;font-weight:700;color:var(--text);text-decoration:none}.app-main{max-width:820px;margin:0 auto;padding:24px 16px 80px}.situation{background:var(--surface);border:1px solid var(--border);border-left:4px solid var(--accent);border-radius:8px;padding:16px 18px;margin-bottom:20px}.situation-title{font-size:13px;color:var(--muted);margin:0 0 8px;letter-spacing:.04em}.situation-text{margin:0;white-space:pre-wrap}.question{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:18px 20px;margin-bottom:20px}.question-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}.question-seq{font-size:13px;font-weight:700;color:var(--accent)}.question-id{font-size:12px;color:var(--muted);background:var(--bg);padding:2px 8px;border-radius:4px}.question-prompt{margin:0 0 16px;white-space:pre-wrap;font-size:16px}.choices{list-style:none;margin:0 0 8px;padding:0}.choice{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--border);border-radius:6px;padding:10px 12px;margin-bottom:8px}.choice-num{flex:none;width:24px;height:24px;border-radius:50%;background:var(--bg);color:var(--muted);font-size:13px;font-weight:700;display:inline-flex;align-items:center;justify-content:center}.choice-text{flex:1}.choice-correct{background:var(--correct-bg);border-color:var(--correct-border)}.choice-correct .choice-num{background:var(--correct-border);color:#fff}.choice-badge{flex:none;align-self:center;font-size:12px;font-weight:700;color:var(--correct-text);border:1px solid var(--correct-border);border-radius:4px;padding:1px 6px}.choice-fallback{font-size:13px;color:var(--muted)}.num-answer{display:flex;align-items:baseline;gap:10px;background:var(--correct-bg);border:1px solid var(--correct-border);border-radius:6px;padding:10px 14px;margin-bottom:8px}.num-answer-label{font-size:13px;font-weight:700;color:var(--correct-text)}.num-answer-value{font-size:20px;font-weight:700}.meta{margin:16px 0 0;padding-top:12px;border-top:1px dashed var(--border);display:grid;grid-template-columns:1fr;gap:6px;font-size:13px}.meta-row{display:grid;grid-template-columns:84px 1fr;gap:10px}.meta-row dt{color:var(--muted);margin:0}.meta-row dd{margin:0}.tags{display:flex;flex-wrap:wrap;gap:6px}.tag{background:var(--bg);border:1px solid var(--border);border-radius:4px;padding:1px 8px;font-size:12px}.tag-flag{background:#fff7ed;border-color:#fdba74;color:#b45309}.loading{display:flex;align-items:center;gap:12px;color:var(--muted);padding:40px 0}.spinner{width:22px;height:22px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.error,.notfound{padding:24px 0;color:var(--muted)}.error{color:#b91c1c}