.mv-board {
  max-width: 460px;
  margin: 0 auto 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mv-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: clamp(1.5rem, 6vw, 2rem);
  padding: 10px 6px;
  border-radius: var(--radius);
  background: var(--cell-bg);
}

.mv-row.mv-question {
  border: 2px dashed var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--cell-bg));
}

.mv-row .mv-obj {
  display: inline-flex;
  line-height: 1;
}

.mv-row .mv-op {
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.85em;
}

.mv-row .mv-eq {
  color: var(--text-muted);
  font-weight: 700;
  margin: 0 2px;
}

.mv-row .mv-sum {
  font-weight: 800;
  color: var(--text);
  font-family: var(--font-ui);
}

.mv-row .mv-sum.mv-unknown {
  color: var(--accent);
}

.mv-form {
  display: flex;
  gap: 10px;
  width: 100%;
  max-width: 460px;
  margin: 0 auto;
  justify-content: center;
}
.mv-form input {
  width: 140px;
  height: 54px;
  font-size: 1.5rem;
  text-align: center;
  border: 2px solid var(--border-strong);
  border-radius: 10px;
  background: var(--cell-bg);
  color: var(--text);
  font-family: var(--font-ui);
}
.mv-form input:focus { outline: none; border-color: var(--accent); }
.mv-form input:disabled { opacity: 0.6; }

.mv-feedback {
  max-width: 460px;
  margin: 18px auto 0;
  text-align: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  box-shadow: var(--shadow);
}
.mv-feedback p {
  margin: 0 0 12px;
  line-height: 1.5;
}
.mv-feedback.correct { border-color: var(--success); background: var(--success-bg); }
.mv-feedback.wrong { border-color: var(--danger); background: var(--danger-bg); }

.mv-row.flash-correct { animation: mv-flash-correct 0.4s ease; }
.mv-row.flash-wrong { animation: mv-flash-wrong 0.45s ease; }
@keyframes mv-flash-correct {
  0% { background: var(--success-bg); }
  100% { background: color-mix(in srgb, var(--accent) 8%, var(--cell-bg)); }
}
@keyframes mv-flash-wrong {
  0% { background: var(--danger-bg); }
  100% { background: var(--danger-bg); }
}