.reflex-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

.digit-box {
  width: min(60vw, 220px);
  height: min(60vw, 220px);
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 3px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(4rem, 20vw, 7rem);
  font-weight: 800;
  color: var(--accent);
  box-shadow: var(--shadow);
  cursor: pointer;
  user-select: none;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}
.digit-box.blank {
  color: transparent;
  border-color: var(--border);
}
.digit-box.flash-correct {
  animation: flash-correct-anim 0.35s ease;
}
.digit-box.flash-wrong {
  animation: flash-wrong-anim 0.45s ease;
}
@keyframes flash-correct-anim {
  0% { border-color: var(--success); background: var(--success-bg); transform: scale(1.05); }
  100% { border-color: var(--border-strong); background: var(--bg-elevated); transform: scale(1); }
}
@keyframes flash-wrong-anim {
  0% { border-color: var(--danger); background: var(--danger-bg); transform: scale(1.05); }
  100% { border-color: var(--danger); background: var(--danger-bg); transform: scale(1); }
}

.reflex-input-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

#digit-input {
  width: 90px;
  height: 56px;
  font-size: 1.8rem;
  text-align: center;
  border: 2px solid var(--border-strong);
  border-radius: 10px;
  background: var(--cell-bg);
  color: var(--text);
  font-family: var(--font-ui);
}
#digit-input:focus {
  outline: none;
  border-color: var(--accent);
}

.reflex-hint {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  max-width: 360px;
  width: 100%;
}
.keypad-btn {
  padding: 12px 0;
  font-size: 1.15rem;
  font-weight: 700;
}