.fraction-page {
  background: radial-gradient(circle at top right, #eef2ff, #f8fafc 45%, #f5f7fb);
}

.fraction-board {
  display: grid;
  gap: 1rem;
  max-width: 980px;
  margin: 0 auto;
}

/* Este proyecto no tiene una regla .hidden global. */
.fraction-board .hidden {
  display: none;
}

.fraction-screen {
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 18px;
  padding: clamp(1rem, 2vw, 1.4rem);
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.08);
}

.fraction-title {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.05;
  color: #312e81;
}

.fraction-subtitle {
  margin: 0.65rem 0 0;
  color: var(--muted);
  max-width: 62ch;
}

.fraction-section-label {
  margin: 1.2rem 0 0.8rem;
  font-size: 1rem;
}

/* ── Intro ───────────────────────────────────────────────────────────────── */
.fraction-modes {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.fraction-modes li {
  display: grid;
  gap: 0.25rem;
  padding: 0.85rem 0.95rem;
  border-radius: 14px;
  border: 1px solid rgba(99, 102, 241, 0.22);
  background: #eef2ff;
}

.fraction-modes-icon {
  font-size: 1.4rem;
  line-height: 1;
  color: #4f46e5;
}

.fraction-modes strong {
  color: #312e81;
}

.fraction-modes span:last-child {
  color: #475569;
  font-size: 0.9rem;
  line-height: 1.35;
}

.fraction-level-grid {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.fraction-level-btn {
  display: grid;
  gap: 0.3rem;
  text-align: left;
  padding: 0.95rem 1rem;
  border-radius: 14px;
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: linear-gradient(180deg, #ffffff 0%, #f6f9ff 100%);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.05);
  cursor: pointer;
  font: inherit;
  color: inherit;
  transition: transform 140ms ease, border-color 140ms ease;
}

.fraction-level-btn:hover {
  transform: translateY(-2px);
  border-color: #6366f1;
}

.fraction-level-btn strong {
  font-size: 1.02rem;
  color: #312e81;
}

.fraction-level-btn small {
  color: var(--muted);
  line-height: 1.35;
}

/* ── HUD ─────────────────────────────────────────────────────────────────── */
.fraction-hud {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 0.7rem;
  margin-bottom: 0.9rem;
}

.fraction-stat {
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: 14px;
  padding: 0.6rem 0.75rem;
  background: rgba(255, 255, 255, 0.9);
  text-align: center;
}

.fraction-stat span {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
  margin-bottom: 0.2rem;
}

.fraction-stat strong {
  font-size: 1.15rem;
  color: #312e81;
}

/* ── Tarjeta de juego ────────────────────────────────────────────────────── */
.fraction-card {
  display: grid;
  gap: 1rem;
  justify-items: center;
}

.fraction-question {
  margin: 0;
  width: 100%;
  border-radius: 14px;
  padding: 0.9rem 1rem;
  background: #eef2ff;
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: #312e81;
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  font-weight: 800;
  text-align: center;
}

.fraction-prompt {
  display: flex;
  justify-content: center;
  color: #4338ca;
}

.fraction-prompt .fraction-value {
  font-size: clamp(2rem, 7vw, 3rem);
}

.fraction-mixed-value {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  font-size: clamp(2rem, 7vw, 3rem);
  font-weight: 900;
  color: #4338ca;
}

.fraction-mixed-value .fraction-value {
  font-size: 0.8em;
}

.fraction-value {
  display: inline-grid;
  justify-items: center;
  line-height: 1;
  font-weight: 900;
}

.fraction-value__bar {
  width: 100%;
  min-width: 1.5em;
  height: 0.12em;
  margin: 0.16em 0;
  border-radius: 999px;
  background: currentColor;
}

.fraction-stage {
  display: grid;
  gap: 0.6rem;
  justify-items: center;
  width: 100%;
}

.fraction-mixed-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.9rem;
  width: min(100%, 760px);
  align-items: start;
}

.fraction-grid-group {
  display: grid;
  gap: 0.5rem;
  justify-items: center;
  min-width: 0;
  padding: 0.7rem;
  border: 1px solid #c7d2fe;
  border-radius: 14px;
  background: #f8faff;
}

.fraction-grid-group__title {
  color: #3730a3;
  font-size: 0.88rem;
  font-weight: 900;
  text-align: center;
}

.fraction-grid-group .fraction-grid {
  width: min(100%, calc(var(--fraction-cols, 3) * var(--fraction-cell-max, 54px)));
}

.fraction-grid {
  display: grid;
  grid-template-columns: repeat(var(--fraction-cols, 3), 1fr);
  gap: 0.4rem;
  width: min(100%, calc(var(--fraction-cols, 3) * var(--fraction-cell-max, 54px)));
  margin: 0 auto;
}

.fraction-cell {
  aspect-ratio: 1 / 1;
  min-width: 0;
  padding: 0;
  border: 2px solid #a5b4fc;
  border-radius: 10px;
  background: #ffffff;
  box-shadow: inset 0 -2px 0 rgba(15, 23, 42, 0.05);
}

.fraction-cell.is-painted {
  background: linear-gradient(145deg, #818cf8, #4f46e5);
  border-color: #4338ca;
}

.fraction-cell--interactive {
  cursor: pointer;
  transition: transform 120ms ease, background-color 120ms ease;
}

.fraction-cell--interactive:hover:not(:disabled) {
  transform: scale(1.05);
  border-color: #4f46e5;
}

.fraction-cell--interactive:disabled {
  cursor: default;
}

.fraction-counter {
  margin: 0;
  font-weight: 700;
  color: #4338ca;
}

/* ── Opciones ────────────────────────────────────────────────────────────── */
.fraction-options {
  display: grid;
  gap: 0.75rem;
  width: 100%;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
}

.fraction-options--grids {
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.fraction-option {
  display: grid;
  justify-items: center;
  gap: 0.4rem;
  padding: 0.85rem 0.6rem;
  border-radius: 14px;
  border: 2px solid rgba(99, 102, 241, 0.25);
  background: #ffffff;
  color: #312e81;
  font: inherit;
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, background-color 140ms ease;
}

.fraction-option .fraction-grid {
  --fraction-cell-max: 30px;
  gap: 0.22rem;
}

.fraction-option .fraction-cell {
  border-width: 1.5px;
  border-radius: 6px;
}

.fraction-option:hover:not(:disabled) {
  transform: translateY(-2px);
  border-color: #6366f1;
  background: #eef2ff;
}

.fraction-option:disabled {
  cursor: default;
}

.fraction-option.is-correct {
  border-color: #16a34a;
  background: #ecfdf5;
  color: #166534;
}

.fraction-option.is-wrong {
  border-color: #dc2626;
  background: #fef2f2;
  color: #991b1b;
}

.fraction-level-btn:focus-visible,
.fraction-option:focus-visible,
.fraction-cell--interactive:focus-visible {
  outline: 3px solid #f59e0b;
  outline-offset: 3px;
}

/* ── Pistas y feedback ───────────────────────────────────────────────────── */
.fraction-hint,
.fraction-feedback {
  margin: 0;
  width: 100%;
  border-radius: 14px;
  padding: 0.8rem 1rem;
  text-align: center;
}

.fraction-hint {
  background: #fffbeb;
  border: 1px solid rgba(245, 158, 11, 0.25);
  color: #92400e;
  font-size: 0.92rem;
}

.fraction-feedback {
  min-height: 1.25rem;
  background: #f8fafc;
  border: 1px solid rgba(148, 163, 184, 0.18);
  color: var(--text);
  font-weight: 700;
}

.fraction-feedback.success {
  background: #ecfdf5;
  border-color: rgba(34, 197, 94, 0.22);
  color: #166534;
}

.fraction-feedback.error {
  background: #fef2f2;
  border-color: rgba(239, 68, 68, 0.22);
  color: #991b1b;
}

.fraction-actions,
.fraction-result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  justify-content: center;
  margin-top: 1rem;
}

.fraction-error {
  margin: 0;
  padding: 0.85rem 1rem;
  border-left: 4px solid #b42318;
  border-radius: 10px;
  background: #fee4e2;
  color: #7a271a;
  font-weight: 700;
}

/* ── Resultado ───────────────────────────────────────────────────────────── */
.fraction-result-card {
  display: grid;
  gap: 1rem;
  justify-items: center;
  text-align: center;
}

.fraction-result-card h2 {
  margin: 0;
  color: #312e81;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
}

.fraction-result-stats {
  display: grid;
  gap: 0.7rem;
  width: 100%;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.fraction-result-stat {
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: 14px;
  padding: 0.75rem;
  background: #f8fbff;
}

.fraction-result-stat span {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  margin-bottom: 0.2rem;
}

.fraction-result-stat strong {
  font-size: 1.45rem;
  color: #312e81;
}

.fraction-result-message {
  margin: 0;
  color: #475569;
}

@media (max-width: 520px) {
  .fraction-mixed-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.55rem;
  }

  .fraction-grid-group {
    padding: 0.45rem;
  }

  .fraction-grid {
    --fraction-cell-max: 48px;
    gap: 0.3rem;
  }

  .fraction-option .fraction-grid {
    --fraction-cell-max: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .fraction-level-btn,
  .fraction-option,
  .fraction-cell--interactive {
    transition: none;
  }
}