/* Variables y Sistema de Diseño Neutral */
:root {
  --font-family: 'Inter', 'Montserrat', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /* Colores Neutros */
  --bg-main: #e2e8f0;
  --bg-card: #ffffff;
  --bg-hover: #cbd5e1;
  --text-main: #0f172a;
  --text-secondary: #334155;
  --text-muted: #475569;
  --border-light: #94a3b8;
  --border-focus: #64748b;
  
  /* Colores Identidad */
  --brand-orange: #fe8f00;
  --brand-orange-hover: #e07d00;
  --brand-orange-light: #fff7ed;
  
  /* Colores de Estado */
  --state-reservado: #2563eb;
  --state-completo: #16a34a;
  --state-incompleto: #d97706;
  --state-ausente: #dc2626;
  --state-cancelado: #4b5563;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --radius-sm: 4px;
  --radius-md: 6px;
  --transition-fast: 0.15s ease;
}

/* Reset Básico */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Contenedores y Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Header */
.app-header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-light);
  padding: 1.5rem 0;
}

.app-header .header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.logo-placeholder {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-text h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.025em;
}

.logo-text p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.1rem;
}

/* Navegación por Pestañas */
.nav-tabs {
  display: flex;
  justify-content: center;
  margin-bottom: -1px;
  overflow-x: auto;
  overflow-y: hidden;
  gap: 4px;
  padding: 0.5rem 0.5rem 0 0.5rem;
  border-bottom: none;
  scrollbar-width: none;
  -ms-overflow-style: none;
  position: relative;
  z-index: 10;
}

.nav-tabs::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  background-color: #cbd5e1;
  border: 1px solid var(--border-light);
  border-bottom: none;
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  border-top-left-radius: var(--radius-md);
  border-top-right-radius: var(--radius-md);
  white-space: nowrap;
  margin-bottom: -2px;
  z-index: 1;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  background-color: #94a3b8;
  color: var(--text-main);
}

.tab-btn.active {
  background-color: var(--brand-orange);
  border-color: var(--brand-orange);
  color: white;
  font-weight: 600;
  z-index: 11;
}

/* Pestañas de contenido */
.tab-content {
  display: none;
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  z-index: 1;
}

.tab-content.active {
  display: block;
  animation: fadeIn var(--transition-fast) forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Tarjetas (Cards) */
.card {
  background-color: transparent;
  border: none;
  border-bottom: 1px solid var(--border-light);
  border-radius: 0;
  padding: 1.5rem 0;
  margin-bottom: 0;
  box-shadow: none;
  transition: none;
}

.card:hover {
  border-color: var(--border-light);
}

.card:last-child {
  border-bottom: none;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

/* Badges y Etiquetas */
.badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.badge-neutral { background-color: var(--bg-hover); color: var(--text-secondary); }
.badge-orange { background-color: var(--brand-orange-light); color: var(--brand-orange); border: 1px solid rgba(254, 143, 0, 0.2); }

.badge-reservado { background-color: rgba(37, 99, 235, 0.1); color: var(--state-reservado); }
.badge-completo { background-color: rgba(22, 163, 74, 0.1); color: var(--state-completo); }
.badge-incompleto { background-color: rgba(217, 119, 6, 0.1); color: var(--state-incompleto); }
.badge-ausente { background-color: rgba(220, 38, 38, 0.1); color: var(--state-ausente); }
.badge-cancelado { background-color: rgba(75, 85, 99, 0.1); color: var(--state-cancelado); }

/* Notificaciones y Alertas */
.alert-warning {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  background-color: #fffbeb;
  border: 1px solid #fde68a;
  color: #78350f;
  font-size: 0.85rem;
  line-height: 1.4;
}

.alert-warning svg, .alert-info svg {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
}

.alert-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  background-color: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1e3a8a;
  font-size: 0.85rem;
  line-height: 1.4;
}

/* Lista de viñetas personalizadas */
.custom-bullet-list {
  list-style: none;
  padding-left: 0;
  margin-top: 0.5rem;
}

.custom-bullet-list li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.35rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.custom-bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  background-color: var(--brand-orange);
  border-radius: 50%;
}

/* Grid de Requerimientos */
.requirements-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

/* Buscador y Controles */
.search-controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.input-text {
  flex: 1;
  min-width: 250px;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 0.9rem;
  color: var(--text-main);
  outline: none;
  background-color: var(--bg-card);
  transition: border-color var(--transition-fast);
}

.input-text:focus {
  border-color: var(--border-focus);
}

.select-filter {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg fill='%234b5563' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'><path d='M7 10l5 5 5-5z'/><path d='M0 0h24v24H0z' fill='none'/></svg>");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1.25rem;
  padding: 0.6rem 2.25rem 0.6rem 0.75rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 0.9rem;
  color: var(--text-secondary);
  background-color: var(--bg-card);
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.select-filter:focus {
  border-color: var(--border-focus);
}

/* Botones */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-family);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  background-color: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  outline: none;
  transition: all var(--transition-fast);
}

.btn:hover {
  background-color: var(--bg-hover);
  color: var(--text-main);
}

.btn-primary {
  background-color: var(--brand-orange);
  border-color: var(--brand-orange);
  color: white;
}

.btn-primary:hover {
  background-color: var(--brand-orange-hover);
  border-color: var(--brand-orange-hover);
  color: white;
}

.btn-danger {
  color: var(--state-ausente);
}

.btn-danger:hover {
  background-color: rgba(220, 38, 38, 0.05);
  border-color: var(--state-ausente);
  color: var(--state-ausente);
}

/* Acordeón de Detalles (Casos de Uso) */
.use-cases-container {
  margin-top: 1rem;
  border-top: 1px solid var(--border-light);
  padding-top: 1rem;
}

.use-case-item {
  margin-bottom: 0.75rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background-color: var(--bg-main);
}

.use-case-summary {
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.use-case-content {
  padding: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-light);
}

/* Modales y Formularios de Propuesta */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.4);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  max-width: 500px;
  width: 90%;
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  position: relative;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--text-muted);
}

.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--text-secondary);
}

.textarea-field {
  width: 100%;
  min-height: 100px;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 0.9rem;
  outline: none;
  resize: vertical;
  background-color: var(--bg-card);
}

.textarea-field:focus {
  border-color: var(--border-focus);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

/* Estilos de la Pestaña de Diseño Visual */
.design-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.color-card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--bg-card);
}

.color-preview {
  height: 80px;
}

.color-info {
  padding: 0.75rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.color-hex {
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.font-demo {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1rem;
  background-color: var(--bg-card);
}

/* Simulador del Carrito de Variantes */
.sim-container {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.sim-box {
  flex: 1;
  min-width: 250px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1rem;
  background-color: var(--bg-card);
}

.variant-checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  cursor: pointer;
}

/* Simulador de Grilla de Slots */
.slots-grid-demo {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.slot-item {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 0.35rem;
  text-align: center;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.slot-item:hover {
  border-color: var(--brand-orange);
  background-color: var(--brand-orange-light);
}

.slot-item.selected {
  background-color: var(--brand-orange);
  border-color: var(--brand-orange);
  color: white;
}

.slot-item.occupied {
  background-color: var(--bg-hover);
  color: var(--text-muted);
  cursor: not-allowed;
  border-color: var(--border-light);
  text-decoration: line-through;
}

/* Listado de Propuestas */
.proposals-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.proposal-item {
  border: 1px solid var(--border-light);
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1rem;
  position: relative;
}

.proposal-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.proposal-body {
  font-size: 0.9rem;
}

.proposal-target {
  font-weight: 600;
  color: var(--brand-orange);
}

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Notificaciones Toast */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 1100;
}

.toast {
  background-color: #333333;
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  box-shadow: var(--shadow-md);
  animation: slideIn var(--transition-fast) forwards;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Responsivo */
@media (max-width: 768px) {
  .app-header .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}