:root{--bg: #1a1a2e;--surface: #16213e;--surface-hover: #1c2a4f;--accent: #e94560;--accent-hover: #d13850;--text: #eeeeee;--text-muted: #8899aa;--jp-font: "Noto Sans JP", sans-serif;--en-font: "Inter", system-ui, -apple-system, sans-serif;--radius: 12px;--radius-sm: 8px}*{margin:0;padding:0;box-sizing:border-box}html,body,#root{height:100%}body{font-family:var(--en-font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}.app{min-height:100%;display:flex;flex-direction:column;align-items:center;padding:24px 16px;max-width:600px;margin:0 auto}.header{text-align:center;margin-bottom:32px;width:100%}.header h1{font-size:28px;font-weight:700;letter-spacing:2px}.header h1 span{color:var(--accent)}.header 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0;color:var(--text)}.kana-choices{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:8px}.kana-choice-btn{padding:18px 12px;background:var(--surface);border:2px solid rgba(255,255,255,.08);border-radius:var(--radius);color:var(--text);font-size:17px;font-family:Noto Sans JP,sans-serif;cursor:pointer;text-align:center;transition:all .15s}.kana-choice-btn:hover{background:var(--surface-hover);border-color:var(--accent)}.kana-choice-btn.correct{background:#22c55e26;border-color:#22c55e;color:#22c55e}.kana-choice-btn.wrong{background:#ef444426;border-color:#ef4444;color:#ef4444}@keyframes arcade-shake{0%,to{transform:translate(0)}20%,60%{transform:translate(-6px)}40%,80%{transform:translate(6px)}}.kana-choice-btn.shake{animation:arcade-shake .3s ease}.kana-choice-btn.glyph{font-size:26px}.kana-choices.kid{gap:14px}.kana-choices.kid .kana-choice-btn{padding:26px 12px;font-size:22px}.kana-choices.kid 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