/* ==========================================================================
   GENERADOR DE DIVISIONES - ESTILOS PREMIUM Y CUADRÍCULA INFALIBLE
   ========================================================================== */
:root {
  --gr-cell: 34px;
  --gr-sol-color: var(--color-primary); /* Azul premium para soluciones (cociente, restas, residuos) */
  --gr-border-op: #0f172a; /* Slate oscuro para la galera y líneas de resta */
}

/* ==========================================================================
   PASO 1: CONFIGURACIÓN PREMIUM
   ========================================================================== */
.gr-step {
  background: var(--bg-card, #ffffff);
  border: 1px solid rgba(226, 232, 240, 0.8);
  border-radius: 16px;
  padding: 3rem;
  box-shadow: 0 10px 30px -5px rgba(15, 23, 42, 0.08);
  margin-bottom: 2.5rem;
  animation: fadeInSmooth 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.gr-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent), var(--color-success));
}

.gr-step__header h2 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-ink, #0f172a);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.gr-step__desc {
  color: var(--color-muted, #64748b);
  font-size: 1.1rem;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.gr-section {
  margin-bottom: 2.5rem;
}

.gr-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink, #0f172a);
  margin-bottom: 1rem;
}

/* Selector de Cantidad */
.gr-qty-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.gr-qty-btn {
  width: 48px;
  height: 48px;
  border: 2px solid #cbd5e1;
  border-radius: 12px;
  background: var(--color-surface-2);
  color: #0f172a;
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.gr-qty-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-soft);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.2);
}

.gr-qty-input {
  width: 88px;
  height: 48px;
  border: 2px solid #cbd5e1;
  border-radius: 12px;
  background: #ffffff;
  color: #0f172a;
  font-size: 1.35rem;
  font-weight: 800;
  text-align: center;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.gr-qty-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15);
}

.gr-presets {
  display: flex;
  gap: 0.6rem;
  margin-left: 1rem;
  flex-wrap: wrap;
}

.gr-preset {
  padding: 0.6rem 1.25rem;
  border: 2px solid #cbd5e1;
  border-radius: 100px;
  background: #ffffff;
  color: #475569;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}

.gr-preset:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-soft);
  transform: translateY(-1px);
}

.gr-preset.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

/* Selector de Tipo / Estilo */
.gr-type-toggle {
  display: flex;
  gap: 1rem;
  max-width: 580px;
}

.gr-toggle-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.15rem;
  border: 2px solid #cbd5e1;
  border-radius: 14px;
  background: #ffffff;
  color: #475569;
  font-weight: 800;
  font-size: 1.05rem;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.gr-toggle-btn:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(56, 189, 248, 0.15);
}

.gr-toggle-btn.active {
  background: linear-gradient(135deg, var(--color-primary-soft), var(--color-primary-soft));
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.2);
}

.gr-toggle-icon {
  font-size: 1.25rem;
}

/* Tarjetas de Rango */
.gr-ranges-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.gr-range-card {
  background: var(--color-surface-2);
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  padding: 1.75rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.gr-range-card:hover {
  border-color: #cbd5e1;
  background: #ffffff;
}

.gr-range-badge {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  display: inline-block;
  background: var(--color-primary-soft);
  padding: 0.35rem 1rem;
  border-radius: 100px;
}

.gr-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.gr-pill {
  padding: 0.75rem 1.5rem;
  border: 2px solid #cbd5e1;
  border-radius: 100px;
  background: #ffffff;
  color: #475569;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}

.gr-pill:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-soft);
  transform: translateY(-1px);
}

.gr-pill.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
}

/* Caja de advertencia */
.gr-warning-box {
  margin-top: 1.5rem;
  background: #fff1f2;
  border: 2px solid #fecdd3;
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  align-items: center;
  gap: 1rem;
  animation: fadeInSmooth 0.3s ease;
  display: none;
}

.gr-warning-box:not([hidden]) {
  display: flex;
}

.gr-warning-icon {
  font-size: 1.75rem;
}

.gr-warning-text {
  color: #9f1239;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.4;
  margin: 0;
}

.gr-btn-generate {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary));
  border: none;
  border-radius: 100px;
  padding: 1.25rem 3.5rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: #ffffff;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(2, 132, 199, 0.35);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.gr-btn-generate:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 32px rgba(2, 132, 199, 0.45);
}

.gr-btn-generate:disabled {
  background: #cbd5e1;
  color: #94a3b8;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.gr-btn-row {
  margin-top: 3.5rem;
  text-align: center;
}

/* ==========================================================================
   PASO 2: VISTA EN CUADERNO PREMIUM
   ========================================================================== */
.gr-toolbar {
  background: var(--bg-card, #ffffff);
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  padding: 1.25rem 2rem;
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
}

.gr-toolbar-left,
.gr-toolbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.gr-toolbar-divider {
  width: 2px;
  height: 28px;
  background: #e2e8f0;
}

.gr-stats-text {
  font-size: 1rem;
  color: #64748b;
}

.gr-stats-text strong {
  color: #0f172a;
  font-weight: 800;
}

.gr-toggle-answers {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1.5rem;
  border: 2px solid #cbd5e1;
  border-radius: 100px;
  background: #ffffff;
  color: #0f172a;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.2s ease;
}

.gr-toggle-answers:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.gr-toggle-answers.active {
  background: #10b981;
  border-color: #059669;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

/* Hoja de Cuaderno */
.gr-notebook {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 20px;
  box-shadow: 0 20px 50px -10px rgba(15, 23, 42, 0.12);
  overflow: hidden;
}

.gr-worksheet-header {
  background: #ffffff;
  border-bottom: 3px solid #0f172a;
  padding: 1.25rem 2rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  width: 100%;
  box-sizing: border-box;
}

.gr-header-row {
  width: 100%;
  max-width: 700px;
}

.gr-header-title-input {
  width: 100%;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 1.65rem;
  font-weight: 900;
  color: #0f172a;
  text-align: center;
  outline: none;
  padding: 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease;
}

.gr-header-title-input:focus {
  border-bottom: 2px solid var(--color-primary);
}

.gr-header-subtitle-input {
  width: 100%;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 1.1rem;
  font-weight: 700;
  color: #475569;
  text-align: center;
  outline: none;
  padding: 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease;
}

.gr-header-subtitle-input:focus {
  border-bottom: 2px solid var(--color-primary);
}

.gr-header-date {
  width: 100%;
  max-width: 700px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0;
  font-size: 0.95rem;
  color: #475569;
}

.gr-header-date-label {
  font-weight: 700;
  color: #0f172a;
  white-space: nowrap;
}

.gr-header-date-input {
  border: none;
  border-bottom: 1px solid #cbd5e1;
  background: transparent;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  color: #0f172a;
  outline: none;
  padding: 0.1rem 0.5rem;
  text-align: center;
  width: 120px;
  transition: border-color 0.2s ease;
}

.gr-header-date-input:focus {
  border-bottom-color: var(--color-primary);
}

.gr-header-meta {
  width: 100%;
  max-width: 700px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed #cbd5e1;
  box-sizing: border-box;
}

.gr-meta-item--student {
  display: flex;
  align-items: flex-end;
  gap: 0.75rem;
  flex: 1;
}

.gr-meta-item--score {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.gr-meta-label {
  font-size: 1.05rem;
  font-weight: 800;
  color: #0f172a;
  white-space: nowrap;
  line-height: 1.2;
}

.gr-meta-line {
  flex: 1;
  border-bottom: 2px solid #0f172a;
  position: relative;
  height: 26px;
}

.gr-student-input {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  color: #0f172a;
  outline: none;
  padding: 0 0.25rem;
}

.gr-score-box {
  width: 54px;
  height: 40px;
  border: 2px solid #0f172a;
  border-radius: 8px;
  background: var(--color-surface-2);
  flex-shrink: 0;
}

.gr-grid-container {
  padding: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 3rem 2.5rem;
  justify-content: flex-start;
  align-items: flex-start;
  min-height: 500px;
}

/* ==========================================================================
   CUADRÍCULAS DE OPERACIÓN INFALIBLES PARA DIVISIONES (GALERA)
   ========================================================================== */
.gr-exercise-wrapper {
  display: inline-flex;
}

.gr-exercise-box {
  display: inline-flex;
  flex-direction: column;
  background: #ffffff;
  border-top: 1px solid #cbd5e1;
  border-left: 1px solid #cbd5e1;
  border-radius: 8px;
  box-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.05);
  overflow: hidden;
}

.gr-math-row {
  display: flex;
  flex-direction: row;
  height: var(--gr-cell);
}

.gr-cell {
  width: var(--gr-cell);
  height: var(--gr-cell);
  box-sizing: border-box;
  border-right: 1px solid #cbd5e1;
  border-bottom: 1px solid #cbd5e1;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 0;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 1.35rem;
  font-weight: 800;
  color: #0f172a;
  background: #ffffff;
  position: relative;
}

/* Bordes para la galera (casita) y para líneas de resta */
.gd-border-top {
  border-top: 3px solid var(--gr-border-op, #0f172a) !important;
}

.gd-border-left {
  border-left: 3px solid var(--gr-border-op, #0f172a) !important;
}

.gd-sign-cell {
  color: var(--color-primary);
  font-weight: 900;
}

.gr-solution {
  color: var(--gr-sol-color);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.gr-solution.visible {
  opacity: 1;
}

/* ==========================================================================
   OVERLAY DE CARGA PARA PDF PREMIUM
   ========================================================================== */
.gr-loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  animation: fadeInSmooth 0.3s ease;
}

.gr-loading-overlay:not([hidden]) {
  display: flex;
}

.gr-loading-box {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 24px;
  padding: 3.5rem 5rem;
  text-align: center;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.3);
}

.gr-spinner {
  width: 56px;
  height: 56px;
  border: 4px solid #e2e8f0;
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spinSmooth 0.8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  margin: 0 auto 1.75rem;
}

.gr-loading-text {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0f172a;
}

@keyframes spinSmooth {
  to {
    transform: rotate(360deg);
  }
}

@keyframes fadeInSmooth {
  from {
    opacity: 0;
    transform: scale(0.98);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .gr-step {
    padding: 1.75rem;
  }

  .gr-worksheet-header {
    padding: 1.25rem;
    gap: 1.25rem;
  }

  .gr-grid-container {
    padding: 1.75rem;
    gap: 2.5rem 1.75rem;
  }
}


/* EduTools visual refresh: shared tool polish */
:root {
  --sl-primary: var(--color-primary);
  --sl-primary-hover: var(--color-primary-dark);
  --sl-accent: var(--color-accent);
  --sl-accent-hover: var(--color-accent-dark);
  --sl-border: var(--color-border);
  --gc2-blue: var(--color-primary);
  --gc2-blue-lt: var(--color-primary-soft);
  --die-bg: var(--color-primary);
  --arena-bg: var(--color-primary-soft);
  --stat-bar-color: var(--color-primary);
}

.tool-stage {
  border-color: rgb(219 226 220 / 0.96);
  background: rgb(255 255 255 / 0.94);
  box-shadow: 0 18px 45px rgb(23 58 70 / 0.08);
}

.tool-stage :is(.sl-step, .gc2-panel, .grade-panel, .team-card, .rb-panel, .rb-card, .rb-section, .md-card, .md-panel, .vote-card, .clock-panel, .roulette-panel, .noise-card, .stats-section, .dice-arena) {
  border-color: rgb(219 226 220 / 0.96);
  border-radius: var(--radius-xl);
  box-shadow: 0 16px 36px rgb(23 58 70 / 0.08);
}

.tool-stage :is(input, textarea, select, .sl-qty-input, .gc2-meta-input, .gc2-setting select, .gc2-setting input[type="number"]) {
  border-color: rgb(202 213 205 / 0.95);
  background-color: #ffffff;
}

.tool-stage :is(input, textarea, select, .sl-qty-input, .gc2-meta-input):focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgb(23 107 135 / 0.12);
}

.btn--ai,
.gc2-btn--primary,
.btn-giant,
.rb-btn--primary,
.md-primary-action,
.vote-primary,
.clock-primary {
  border-color: var(--color-primary);
  color: #ffffff;
  background: var(--color-primary);
  box-shadow: 0 14px 24px rgb(23 107 135 / 0.18);
}

.btn--ai:hover,
.gc2-btn--primary:hover,
.btn-giant:hover,
.rb-btn--primary:hover,
.md-primary-action:hover,
.vote-primary:hover,
.clock-primary:hover {
  background: var(--color-primary-dark);
}

.sl-step::before {
  background: linear-gradient(90deg, var(--color-primary), #1b7f67, var(--color-accent));
}

.sl-preset.active,
.btn-toggle.active,
.grade-meter span {
  background: var(--color-primary);
}

.sl-qty-btn:hover,
.sl-preset:hover {
  border-color: rgb(23 107 135 / 0.34);
  color: var(--color-primary-dark);
  background: var(--color-primary-soft);
  box-shadow: 0 10px 20px rgb(23 107 135 / 0.12);
}

.rb-section__icon,
.rb-export-card__icon,
.edu-warning-icon,
.face {
  display: inline-grid;
  place-items: center;
  color: var(--color-primary-dark);
}

.edu-warning-icon {
  width: 3.75rem;
  height: 3.75rem;
  margin-bottom: 12px;
  border-radius: var(--radius-md);
  background: var(--color-primary-soft);
}

.rb-section__icon,
.rb-export-card__icon {
  border-radius: var(--radius-md);
  background: var(--color-primary-soft);
}

.material-symbols-outlined {
  vertical-align: middle;
}