/* ===== VARIABLES CSS ===== */
:root {
  /* Colores principales */
  --primary-color: #007bff;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #17a2b8;
  --light-color: #f8f9fa;
  --dark-color: #343a40;
  
  /* Colores de texto */
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #6c757d;
  --text-light: #ffffff;
  
  /* Espaciado */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 3rem;
  
  /* Bordes */
  --border-radius: 0.375rem;
  --border-color: #dee2e6;
  
  /* Sombras */
  --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
  
  /* Transiciones */
  --transition-base: all 0.15s ease-in-out;
  --transition-fast: all 0.075s ease-in-out;
  --transition-slow: all 0.3s ease-in-out;
}

/* ===== RESET Y BASE ===== */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: #f8f9fa;
}

/* ===== COMPONENTES REUTILIZABLES ===== */

/* Botones personalizados */
.btn-custom {
  border-radius: var(--border-radius);
  transition: var(--transition-base);
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.btn-custom:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-custom:active {
  transform: translateY(0);
}

/* Tarjetas */
.card-custom {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition-base);
}

.card-custom:hover {
  box-shadow: var(--shadow-md);
}

/* Tablas mejoradas */
.table-custom {
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table-custom thead th {
  background-color: var(--dark-color);
  color: var(--text-light);
  border: none;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.875rem;
  letter-spacing: 0.5px;
}

.table-custom tbody tr {
  transition: var(--transition-fast);
}

.table-custom tbody tr:hover {
  background-color: var(--light-color);
}

/* Formularios */
.form-custom {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}

.form-custom .form-label {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.form-custom .form-control {
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  transition: var(--transition-base);
}

.form-custom .form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Alertas personalizadas */
.alert-custom {
  border-radius: var(--border-radius);
  border: none;
  font-weight: 500;
}

/* ===== LAYOUT ===== */
.main-container {
  min-height: calc(100vh - 200px);
  padding: var(--spacing-lg) 0;
}

.page-header {
  background: linear-gradient(135deg, var(--primary-color), var(--info-color));
  color: white;
  padding: var(--spacing-xl) 0;
  margin-bottom: var(--spacing-lg);
}

.page-header h1 {
  margin: 0;
  font-weight: 700;
  font-size: 2.5rem;
}

/* ===== UTILIDADES ===== */
.text-gradient {
  background: linear-gradient(135deg, var(--primary-color), var(--info-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.shadow-custom {
  box-shadow: var(--shadow-md);
}

.rounded-custom {
  border-radius: var(--border-radius);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .page-header h1 {
    font-size: 2rem;
  }
  
  .main-container {
    padding: var(--spacing-md) 0;
  }
}

/* ===== ANIMACIONES ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.5s ease-out;
}

/* ===== MEJORAS PARA DATA TABLES ===== */
.dataTables_wrapper .dataTables_length,
.dataTables_wrapper .dataTables_filter {
  margin-bottom: var(--spacing-md);
}

.dataTables_wrapper .dataTables_paginate .paginate_button {
  border-radius: var(--border-radius);
  margin: 0 2px;
}

.dataTables_wrapper .dataTables_paginate .paginate_button.current {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

/* ===== MEJORAS PARA EL SPINNER ===== */
.spinner-container {
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
}

.spinner > p {
  font-weight: 600;
  margin: var(--spacing-md) 0;
}