:root {
  --bg-dark: #1e293b;
  --bg-sidebar: #0f172a;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --info: #06b6d4;
  --text-light: #f8fafc;
  --text-dark: #334155;
  --bg-body: #f1f5f9;
  --card-bg: #ffffff;
  --border-color: #cbd5e1;
}

* { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
}

body { 
  display: flex; 
  height: 100vh; 
  background-color: var(--bg-body); 
  color: var(--text-dark); 
  overflow: hidden; 
}

/* LOADER GLOBAL SUPERIOR */
#global-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  z-index: 3000;
  display: none;
  overflow: hidden;
}

#global-loader.active {
  display: block;
}

#global-loader .loader-bar {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--info), var(--primary));
  background-size: 200% 100%;
  animation: loadingAnim 1.2s infinite ease-in-out;
}

@keyframes loadingAnim {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* AVISO CONFIGURACIÓN API */
.api-warning-banner {
  background: #fef3c7;
  color: #92400e;
  border-bottom: 1px solid #f59e0b;
  padding: 8px 20px;
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  z-index: 100;
}

.api-warning-banner a {
  color: #b45309;
  font-weight: bold;
  text-decoration: underline;
  cursor: pointer;
}

/* LAYOUT SIDEBAR & CONTENT */
#sidebar { 
  width: 260px; 
  background-color: var(--bg-sidebar); 
  color: var(--text-light); 
  display: flex; 
  flex-direction: column; 
  flex-shrink: 0; 
  transition: transform 0.3s ease, width 0.3s ease;
  z-index: 1500;
}

#sidebar .brand { 
  font-size: 1.2rem; 
  font-weight: bold; 
  padding: 20px; 
  background: rgba(0,0,0,0.2); 
  border-bottom: 1px solid rgba(255,255,255,0.1); 
  display: flex;
  align-items: center;
  justify-content: space-between;
}

#sidebar .brand-title {
  display: flex;
  flex-direction: column;
}

#sidebar .brand-title span {
  font-size: 0.75rem;
  color: #94a3b8;
  font-weight: normal;
  letter-spacing: 0.5px;
}

#sidebar nav { 
  flex: 1; 
  overflow-y: auto; 
  padding: 10px 0; 
}

.nav-group { 
  font-size: 0.75rem; 
  text-transform: uppercase; 
  color: #64748b; 
  padding: 12px 20px 4px 20px; 
  font-weight: bold; 
  letter-spacing: 1px; 
}

.nav-item { 
  padding: 10px 20px; 
  color: #94a3b8; 
  cursor: pointer; 
  display: flex; 
  align-items: center; 
  transition: all 0.2s; 
  font-size: 0.9rem; 
  user-select: none;
}

.nav-item:hover, .nav-item.active { 
  background-color: rgba(255,255,255,0.05); 
  color: var(--text-light); 
  border-left: 4px solid var(--primary); 
}

#main-content { 
  flex: 1; 
  display: flex; 
  flex-direction: column; 
  overflow: hidden; 
  position: relative;
}

header { 
  background-color: var(--card-bg); 
  border-bottom: 1px solid var(--border-color); 
  padding: 15px 30px; 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
}

header h1 { 
  font-size: 1.5rem; 
  color: var(--text-dark); 
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* BOTÓN HAMBURGUESA */
.btn-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  font-size: 1.4rem;
  color: var(--text-dark);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
}

.btn-menu-toggle:hover {
  background-color: #f1f5f9;
}

.content-body { 
  flex: 1; 
  padding: 25px; 
  overflow-y: auto; 
}

.view-section { 
  display: none; 
  animation: fadeIn 0.2s ease-in-out;
}

.view-section.active { 
  display: block; 
}

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

/* UI COMPONENTS */
.grid-cards { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); 
  gap: 15px; 
  margin-bottom: 25px; 
}

.card { 
  background: var(--card-bg); 
  padding: 20px; 
  border-radius: 8px; 
  border: 1px solid var(--border-color); 
  box-shadow: 0 1px 3px rgba(0,0,0,0.05); 
}

.card .title { 
  font-size: 0.85rem; 
  color: #64748b; 
  font-weight: 600; 
  text-transform: uppercase; 
  margin-bottom: 8px; 
}

.card .value { 
  font-size: 1.5rem; 
  font-weight: bold; 
  color: var(--text-dark); 
}

.chart-container { 
  background: var(--card-bg); 
  border-radius: 8px; 
  border: 1px solid var(--border-color); 
  padding: 20px; 
  margin-bottom: 25px; 
}

.chart-header { 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
  margin-bottom: 15px; 
  flex-wrap: wrap; 
  gap: 10px; 
}

.table-container { 
  background: var(--card-bg); 
  border-radius: 8px; 
  border: 1px solid var(--border-color); 
  overflow-x: auto; 
  margin-bottom: 25px; 
  position: relative;
}

.table-header { 
  padding: 15px 20px; 
  background-color: #f8fafc; 
  border-bottom: 1px solid var(--border-color); 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
  flex-wrap: wrap;
  gap: 10px;
}

.table-header h3 { 
  font-size: 1.1rem; 
}

table { 
  width: 100%; 
  border-collapse: collapse; 
  text-align: left; 
  font-size: 0.9rem; 
  min-width: 600px;
}

th, td { 
  padding: 12px 15px; 
  border-bottom: 1px solid var(--border-color); 
}

th { 
  background-color: #f8fafc; 
  font-weight: 600; 
  color: #475569; 
}

tr:hover { 
  background-color: #f8fafc; 
}

/* SPINNER DENTRO DE TABLAS */
.table-loading-row td {
  text-align: center;
  padding: 30px;
  color: #64748b;
  font-style: italic;
}

/* BUTTONS & FORMS */
.btn { 
  padding: 8px 16px; 
  border: none; 
  border-radius: 6px; 
  cursor: pointer; 
  font-size: 0.85rem; 
  font-weight: 600; 
  transition: all 0.2s; 
  display: inline-flex; 
  align-items: center; 
  gap: 6px; 
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary { background-color: var(--primary); color: white; }
.btn-primary:hover:not(:disabled) { background-color: var(--primary-hover); }

.btn-secondary { background-color: #64748b; color: white; }
.btn-secondary:hover:not(:disabled) { background-color: #475569; }

.btn-success { background-color: var(--success); color: white; }
.btn-success:hover:not(:disabled) { background-color: #059669; }

.btn-danger { background-color: var(--danger); color: white; }
.btn-danger:hover:not(:disabled) { background-color: #dc2626; }

.btn-warning { background-color: var(--warning); color: white; }
.btn-warning:hover:not(:disabled) { background-color: #d97706; }

.btn-sm { padding: 4px 8px; font-size: 0.75rem; }

.form-group { margin-bottom: 15px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; color: #475569; }
.form-control { width: 100%; padding: 8px 12px; border: 1px solid var(--border-color); border-radius: 6px; font-size: 0.9rem; outline: none; transition: border-color 0.2s; }
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(37,99,235,0.15); }
.form-row { display: flex; gap: 15px; }
.form-row .form-group { flex: 1; }

/* MODAL */
.modal-overlay { 
  position: fixed; 
  top: 0; 
  left: 0; 
  width: 100%; 
  height: 100%; 
  background: rgba(0,0,0,0.5); 
  display: none; 
  justify-content: center; 
  align-items: center; 
  z-index: 2000; 
  padding: 15px;
}

.modal-overlay.active { display: flex; }
.modal-content { 
  background: var(--card-bg); 
  width: 100%; 
  max-width: 650px; 
  max-height: 90vh; 
  overflow-y: auto; 
  border-radius: 8px; 
  padding: 25px; 
  box-shadow: 0 10px 25px rgba(0,0,0,0.2); 
  animation: modalScale 0.2s ease-out;
}

@keyframes modalScale {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-header { 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
  margin-bottom: 20px; 
  border-bottom: 1px solid var(--border-color); 
  padding-bottom: 10px; 
}

.modal-header .btn-close {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: #64748b;
}

.modal-header .btn-close:hover {
  color: var(--danger);
}

.modal-footer { 
  margin-top: 20px; 
  border-top: 1px solid var(--border-color); 
  padding-top: 15px; 
  display: flex; 
  justify-content: flex-end; 
  gap: 10px; 
}

/* TOAST NOTIFICATION */
#toast-container { 
  position: fixed; 
  bottom: 20px; 
  right: 20px; 
  z-index: 3500; 
  display: flex; 
  flex-direction: column; 
  gap: 10px; 
}

.toast { 
  padding: 12px 20px; 
  border-radius: 6px; 
  color: white; 
  font-size: 0.9rem; 
  box-shadow: 0 4px 6px rgba(0,0,0,0.1); 
  animation: slideIn 0.3s ease; 
  max-width: 380px; 
  display: flex;
  align-items: center;
  gap: 10px;
}

.toast.success { background-color: var(--success); }
.toast.error { background-color: var(--danger); }
.toast.info { background-color: var(--info); }

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

/* BADGES */
.badge { 
  padding: 3px 8px; 
  border-radius: 12px; 
  font-size: 0.75rem; 
  font-weight: bold; 
  display: inline-block;
}

.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-info { background: #e0f2fe; color: #0369a1; }
.badge-danger { background: #fee2e2; color: #b91c1c; }

/* OVERLAY PARA MÓVIL (CIERRA EL SIDEBAR AL TOCAR AFUERA) */
#sidebar-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0,0,0,0.5);
  z-index: 1400;
}

/* MEDIA QUERIES RESPONSIVE */
@media (max-width: 900px) {
  .btn-menu-toggle {
    display: inline-block;
  }

  #sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    transform: translateX(-100%);
    box-shadow: 2px 0 10px rgba(0,0,0,0.3);
  }

  #sidebar.open {
    transform: translateX(0);
  }

  #sidebar-backdrop.active {
    display: block;
  }

  header {
    padding: 12px 18px;
  }

  header h1 {
    font-size: 1.25rem;
  }

  .content-body {
    padding: 15px;
  }

  .form-row {
    flex-direction: column;
    gap: 0;
  }
}