/* Selector de categorías (pestañas) */
.category-tabs {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.category-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 2px solid var(--border);
  padding: 0.75rem 1.25rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-xs);
}

.category-tab:hover {
  border-color: var(--primary-light);
  color: var(--primary);
  transform: translateY(-2px);
}

.category-tab.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.25);
  transform: translateY(-2px);
}

.category-tab.active svg {
  stroke: white;
}

/* Contenedor de herramientas por categoría */
.category-tools-container {
  padding: 1rem 0;
}

.category-tools-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
}

.tool-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 0.5rem;
  border: 2px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-xs);
  min-height: 72px;
}

.tool-option:hover {
  border-color: var(--primary-light);
  color: var(--primary);
  transform: translateY(-2px);
  background: #f8fafc;
}

.tool-option.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.25);
  transform: translateY(-2px);
}

.tool-option svg {
  width: 18px;
  height: 18px;
  stroke-width: 2;
}

.tool-option.active svg {
  stroke: white;
}

/* Panel de herramienta */
.tool-panel {
  opacity: 0;
  transform: translateY(12px);
  visibility: hidden;
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}

.tool-panel.active {
  opacity: 1;
  transform: translateY(0);
  visibility: visible;
}

.tool-intro {
  text-align: center;
  margin-bottom: 2rem;
}

.tool-intro h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.tool-tagline {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Área de carga de archivos (estilo "dropzone" premium) */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.25rem 1.5rem;
  text-align: center;
  margin: 1.5rem 0 2rem;
  transition: var(--transition);
  cursor: pointer;
  background: #f8fafc;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary-light);
  background: #eff6ff;
}

.dropzone-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  color: var(--primary-light);
}

.dropzone-text {
  font-size: 1.125rem;
  color: var(--text);
  margin-bottom: 8px;
  font-weight: 600;
}

.dropzone-hint {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Botones de acción */
.btn-group {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.9rem 1.75rem;
  border-radius: 12px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  min-width: 160px;
}

.btn:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
  box-shadow: 0 6px 14px rgba(99, 102, 241, 0.3);
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--shadow-xs);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--border);
  color: var(--text);
  box-shadow: none;
}

.btn-outline:hover {
  border-color: var(--primary-light);
  background: #f0f4ff;
  color: var(--primary);
  transform: translateY(-2px);
}

/* Publicidad sutil */
.ad-space {
  margin-top: 2.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
}

.ad-placeholder {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Alertas estilizadas */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  margin: 1.25rem 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
}

.alert-success {
  background: #f0fdf4;
  color: #065f46;
  border: 1px solid #bbf7d0;
}

.alert-error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fca5a5;
}

/* Responsive */
@media (max-width: 600px) {
  .category-tabs {
    flex-direction: column;
    gap: 0.5rem;
  }
  .category-tools-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .tool-option {
    font-size: 0.85rem;
    padding: 0.75rem 0.3rem;
  }
}