*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Noto Sans JP,Hiragino Kaku Gothic ProN,Yu Gothic,sans-serif;background:#f6f7fb;color:#111}.app-shell{max-width:900px;margin:0 auto;padding:18px 14px 40px}h1{margin:8px 0 12px;font-size:1.35rem;font-weight:800}.offline-ok{margin:0 0 10px;font-size:.95rem;color:#0a7a28}.card{background:#fff;border:1px solid #e6e6e6;border-radius:14px;padding:16px;box-shadow:0 6px 18px #0000000d}.lead{margin:0 0 6px;font-size:1.03rem}.muted{margin:0 0 14px;color:#555}.primary-btn,.ghost-btn,.choice-btn{border-radius:12px;border:1px solid #cfcfcf;font-size:1.05rem;padding:10px 14px;cursor:pointer;background:#fff}.primary-btn{background:#111;color:#fff;border-color:#111}.ghost-btn{background:#fff}.primary-btn:hover{opacity:.92}.ghost-btn:hover,.choice-btn:hover{background:#f3f3f3}.progress{margin:0 0 10px;color:#555}.prompt{display:grid;justify-items:center;padding:16px 10px 12px;border:1px solid #e6e6e6;border-radius:14px;background:#fbfbfb}.prompt-sub{font-size:.95rem;color:#666;margin-bottom:6px}.prompt-main{font-size:4rem;font-weight:900;letter-spacing:.02em;line-height:1}.choices-grid{margin-top:14px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.choice-btn{padding:14px 12px;font-size:1.25rem;border:1px solid #cfcfcf;background:#fff}.feedback{margin:14px 0 0;text-align:center;font-size:1.1rem;font-weight:700;min-height:1.4em}.result-score{font-size:1.25rem;font-weight:800}.celebration-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;display:grid;place-items:center;z-index:50;padding:16px}.celebration-card{width:min(520px,92vw);background:#fff;border-radius:18px;padding:18px 16px 14px;border:1px solid #ddd;text-align:center;position:relative;overflow:hidden}.celebration-title{margin:6px 0 4px;font-size:1.4rem;font-weight:900}.celebration-sub{margin:0 0 12px;color:#555;font-weight:700}.celebration-actions{display:flex;justify-content:center}.confetti{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;overflow:hidden}.confetti-piece{position:absolute;top:-10%;left:calc((var(--i) * 1.6%) + 2%);width:10px;height:18px;background:#fc0;opacity:.85;transform:rotate(20deg);animation:fall 1.6s linear infinite}.confetti-piece:nth-child(3n){background:#00c2ff}.confetti-piece:nth-child(3n+1){background:#ff4d6d}.confetti-piece:nth-child(3n+2){background:#7cff6b}@keyframes fall{0%{transform:translateY(0) rotate(20deg)}to{transform:translateY(120vh) rotate(220deg)}}.pulse{animation:pulse 1.2s ease-in-out infinite}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.04)}}@media (max-width: 520px){.prompt-main{font-size:3.2rem}.choice-btn{font-size:1.15rem}}