*{box-sizing:border-box}
html,body{margin:0;padding:0;background:#f3f4f6;color:#111827;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
.app{max-width:620px;margin:0 auto;padding:16px 16px 40px;overflow-x:hidden}
header{display:flex;justify-content:space-between;align-items:center;gap:12px}
h1{font-size:24px;margin:8px 0 4px}
header p{margin:0;color:#6b7280;font-size:13px}
.icon-btn{width:48px;height:48px;border-radius:14px;border:0;background:#fff;font-size:24px;box-shadow:0 2px 10px rgba(0,0,0,.06)}
.toolbar{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:10px;margin:18px 0}
select,button,.file-btn{font:inherit;border-radius:12px;border:1px solid #d1d5db;background:#fff;padding:12px}
.toolbar select{min-width:0;width:100%}
.card{background:#fff;border-radius:24px;padding:30px 20px;text-align:center;min-height:330px;box-shadow:0 8px 30px rgba(0,0,0,.08);display:flex;flex-direction:column;justify-content:center;align-items:center}
.prompt{font-size:34px;font-weight:700;word-break:break-word}
.ipa{font-size:18px;color:#6b7280;margin-top:10px}
.answer{font-size:24px;margin-top:28px;line-height:1.5}
.meta{font-size:13px;color:#6b7280;margin:18px 0}
.primary{background:#111827;color:#fff;border:0;width:100%;margin-top:18px}
.grade{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}
.wrong{background:#fff;border:1px solid #dc2626;color:#b91c1c}
.correct{background:#111827;color:#fff;border:0}
.hidden{display:none!important}
.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:18px 0}
.stats div{min-width:0;background:#fff;border-radius:14px;padding:12px;text-align:center}
.stats strong{display:block;font-size:22px}
.stats span{font-size:12px;color:#6b7280}
.data-actions{display:grid;gap:10px;margin-top:12px}
.file-btn{text-align:center;cursor:pointer}
.file-btn input{display:none}
.note{font-size:12px;color:#6b7280;line-height:1.6}
@media(max-width:380px){.prompt{font-size:29px}.toolbar{grid-template-columns:1fr}.card{min-height:300px}}