.nr-equation-wrap{width:100%;display:flex;justify-content:center}.nr-equation{font:700 1.7rem/1 var(--game-font-mono);padding:12px 20px;min-width:220px;text-align:center;color:var(--game-accent-yellow)}.nr-options{display:grid;grid-template-columns:1fr 1fr;gap:10px;width:100%}.nr-option{min-height:46px;background:var(--game-bg-surface);border:var(--game-border-thick) solid var(--game-border-color);border-radius:var(--game-radius-md);box-shadow:var(--game-shadow-sm);color:var(--game-text-primary);font:700 1.15rem/1 var(--game-font-mono);cursor:pointer;transition:transform .1s ease}.nr-option:active{transform:translate(2px,2px)}.nr-option--correct{background:var(--game-accent-green);color:var(--game-text-on-accent);border-color:var(--game-accent-green)}.nr-option--wrong{background:var(--game-accent-red);color:#fff;border-color:var(--game-accent-red)}#nr-timerbar-wrap{max-width:320px;height:12px;transition:height .15s ease}#nr-timerbar-wrap.nr-timerbar--danger{animation:nr-timer-pulse .5s ease infinite}@keyframes nr-timer-pulse{0%,to{height:12px}50%{height:15px}}.game-progress__fill--danger{background:linear-gradient(90deg,#f87171,#ef4444)!important}.nr-level-footer{text-align:center;padding:4px 16px 8px;color:var(--game-text-secondary)}#game-stage.anim-pulse-combo{box-shadow:inset 0 0 30px var(--game-accent-purple)}.hud-flash-heart{animation:game-pop .3s cubic-bezier(.34,1.56,.64,1)}@media(max-height:700px){.nr-equation{padding:12px 16px;font-size:1.5rem}.nr-option{min-height:44px;font-size:1.1rem}}@media(max-height:580px){.nr-equation{padding:8px 14px;font-size:1.3rem}.nr-option{min-height:38px;font-size:1rem}}