*{margin:0;padding:0;box-sizing:border-box}body{background:#0a0a1a;color:#fff;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}.app{display:flex;flex-direction:column;align-items:center;min-height:100vh;min-height:100dvh;overflow:hidden;padding:8px}h1{font-size:clamp(1.1rem,5vw,1.8rem);margin-top:10px;letter-spacing:2px;text-transform:uppercase;color:#e63946;text-shadow:0 0 12px rgba(230,57,70,.5)}.subtitle{font-size:clamp(.7rem,2.5vw,.85rem);color:#aaa;margin-bottom:8px}.scoreboard{display:flex;gap:clamp(12px,4vw,30px);font-size:clamp(.85rem,3vw,1.1rem);margin-bottom:8px}.scoreboard span{font-weight:700}.scoreboard .correct{color:#2ecc71}.scoreboard .wrong{color:#e74c3c}.scoreboard .streak{color:#f1c40f}.scoreboard .best{color:#3498db}.game-canvas{border:3px solid #333;border-radius:8px;box-shadow:0 0 30px #000000b3;max-width:100%;height:auto}.buttons{display:flex;gap:clamp(10px,3vw,20px);margin-top:12px}.btn{padding:clamp(10px,2.5vw,14px) clamp(20px,6vw,44px);font-size:clamp(.9rem,3vw,1.2rem);font-weight:700;border:none;border-radius:8px;cursor:pointer;text-transform:uppercase;letter-spacing:1px;transition:transform .1s,box-shadow .2s;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.btn:hover{transform:scale(1.05)}.btn:active{transform:scale(.97)}.btn-goal{background:#2ecc71;color:#fff;box-shadow:0 0 16px #2ecc7166}.btn-nogoal{background:#e74c3c;color:#fff;box-shadow:0 0 16px #e74c3c66}.btn-hint{margin-top:6px;padding:8px 24px;font-size:clamp(.75rem,2.5vw,.9rem);background:#f1c40f;color:#222;box-shadow:0 0 12px #f1c40f4d}.btn:disabled{opacity:.4;cursor:default;transform:none}.btn-challenge{margin-top:10px;padding:10px 28px;font-size:clamp(.8rem,2.5vw,.95rem);background:#3498db;color:#fff;box-shadow:0 0 12px #3498db4d}.feedback{margin-top:10px;font-size:clamp(.95rem,3.5vw,1.3rem);font-weight:700;min-height:2em;text-align:center;padding:0 12px}.feedback.right{color:#2ecc71}.feedback.wrong{color:#e74c3c}.instructions{margin-top:8px;color:#777;font-size:clamp(.65rem,2vw,.8rem);text-align:center;padding:0 12px}.instructions kbd{background:#333;padding:2px 6px;border-radius:4px;font-size:.85em}