body{background:#f5f5f5;margin:0;padding:0;font-family:Roboto,Noto Sans JP,Arial,sans-serif}.quiz-container{text-align:center;background:#fff;border-radius:12px;max-width:360px;margin:48px auto;padding:32px 24px 24px;box-shadow:0 2px 8px #3c404326}.flag{background:#f8f9fa;border-radius:8px;margin:0 auto 24px;display:block;box-shadow:0 1px 4px #3c40431a}.choices{flex-direction:column;align-items:stretch;gap:16px;margin-bottom:24px;display:flex}.choice-btn{color:#202124;cursor:pointer;letter-spacing:.01em;background:#f8f9fa;border:1px solid #dadce0;border-radius:6px;padding:12px 0;font-size:1.05rem;font-weight:500;transition:background .18s,box-shadow .18s;box-shadow:0 1px 2px #3c40430a}.choice-btn:hover,.choice-btn:focus{background:#e8f0fe;border-color:#4285f4;outline:none}.index{font-size:24px}.score{color:#4285f4;margin-top:8px;font-size:1rem;font-weight:500}.feedback{color:#34a853;min-height:24px;margin-bottom:26px;font-size:1.1rem;font-weight:500;transition:color .2s}.feedback:empty{margin-bottom:36px}@media (min-width:600px){.quiz-container{max-width:500px}.choices{max-width:320px;margin-left:auto;margin-right:auto}}