body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background:#0b0d10;color:#fff}#root{display:flex;justify-content:center}a{color:inherit;text-decoration:none}button{font-family:inherit}:root{--bg: #0f0f12;--fg: #ffffff;--muted: #b9b9c2;--card: #1a1a21;--chip: #2a2a33;--accent: #ff4d4f;--shadow: rgba(0,0,0,.35)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--fg);font-family:system-ui,-apple-system,Segoe UI,Roboto,Hiragino Sans,Noto Sans JP,sans-serif}.wrap{max-width:980px;margin:0 auto;padding:40px 20px 80px}h1{text-align:center;margin:0 0 24px;font-weight:800;letter-spacing:.3px}.mode-row{display:flex;justify-content:space-between;align-items:center;margin:6px 0 18px;color:var(--muted)}.q-row{display:flex;gap:12px;align-items:center;justify-content:center;margin-bottom:14px}.sound-btn{padding:8px 14px;border-radius:10px;border:1px solid #444;background:#222;color:#fff;box-shadow:0 2px 8px var(--shadow) inset;cursor:pointer}.choices{display:grid;grid-template-columns:1fr 1fr;gap:10px 18px;max-width:620px;margin:0 auto 22px}.choice{padding:10px 14px;border-radius:8px;border:1px solid #4a4a55;background:#1b1b23;color:#eaeaf1;text-align:center;cursor:pointer}.sec-title{margin:14px 0 10px}.examples{display:flex;gap:18px;flex-wrap:wrap}.ex-card{width:170px;background:var(--card);border:1px solid #3a3a44;border-radius:14px;padding:14px 12px;box-shadow:0 6px 18px var(--shadow)}.ex-word{height:28px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:20px;margin-bottom:10px;background:linear-gradient(180deg,#1f1f27,#14141b);border-radius:10px;border:1px solid #333542}.play-btn{width:100%;padding:7px 10px;border-radius:10px;border:1px solid #4a4a55;background:#e9e9ee;color:#111;cursor:pointer}.vowel-red{color:var(--accent)}.choice-correct{background:#1f3b2a!important;outline:2px solid #2ecc71}.choice-wrong{background:#3b1f1f!important;outline:2px solid #ff4d4f}.choice,.sound-btn,.play-btn{pointer-events:auto}