/* ================================================================
   SGG - Sistema de Gestión de Generadores
   CSS Principal - Variables y estilos globales
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ----------------------------------------------------------------
   VARIABLES DE DISEÑO
   ---------------------------------------------------------------- */
:root {
  /* Paleta principal */
  --color-white:        #ffffff;
  --color-bg:           #f7f8fa;
  --color-bg-alt:       #eef0f2;
  --color-surface:      #ffffff;
  --color-surface-alt:  #f9fafb;

  /* Paleta principal pastel */
  --color-green-50:     #f4f9f9;
  --color-green-100:    #e3f0ef;
  --color-green-200:    #c4e1e0;
  --color-green-300:    #9dcaca;
  --color-green-400:    #76b0b0;
  --color-green-500:    #589595;
  --color-green-600:    #477a7a;
  --color-green-700:    #3a6161;
  --color-green-800:    #304f4f;
  --color-green-900:    #294040;

  /* Texto */
  --color-text:         #1a1f1c;
  --color-text-muted:   #637068;
  --color-text-light:   #96a49c;

  /* Bordes */
  --color-border:       #e0e6e2;
  --color-border-focus: var(--color-green-400);

  /* Acento cálido */
  --color-amber-400:    #f59e0b;
  --color-amber-500:    #d97706;
  --color-amber-50:     #fffbeb;
  --color-amber-100:    #fef3c7;

  /* Estados */
  --color-success:      #22a05a;
  --color-success-bg:   #f0faf3;
  --color-warning:      #d97706;
  --color-warning-bg:   #fffbeb;
  --color-danger:       #dc2626;
  --color-danger-bg:    #fef2f2;
  --color-danger-light: #fee2e2;
  --color-info:         #0ea5e9;
  --color-info-bg:      #f0f9ff;

  /* Sombras */
  --shadow-xs:    0 1px 2px rgba(0,0,0,.05);
  --shadow-sm:    0 2px 4px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:    0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);
  --shadow-lg:    0 10px 30px rgba(0,0,0,.1), 0 4px 8px rgba(0,0,0,.05);
  --shadow-xl:    0 20px 60px rgba(0,0,0,.12), 0 8px 20px rgba(0,0,0,.06);
  --shadow-green: 0 4px 16px rgba(34,160,90,.25);

  /* Espaciado */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Radio */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;
  --radius-xl:  20px;
  --radius-full: 9999px;

  /* Tipografía */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-size-xs:   12px;
  --font-size-sm:   13px;
  --font-size-base: 15px;
  --font-size-md:   16px;
  --font-size-lg:   18px;
  --font-size-xl:   20px;
  --font-size-2xl:  24px;
  --font-size-3xl:  30px;
  --font-size-4xl:  36px;

  /* Transiciones */
  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow:   400ms ease;

  /* Sidebar */
  --sidebar-width: 260px;
}

/* ----------------------------------------------------------------
   RESET & BASE
   ---------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-green-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-green-700); }

img { max-width: 100%; height: auto; display: block; }

input, select, textarea, button {
  font-family: inherit;
  font-size: inherit;
}

/* ----------------------------------------------------------------
   TIPOGRAFÍA
   ---------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}
h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p { margin-bottom: var(--space-4); }
p:last-child { margin-bottom: 0; }

/* ----------------------------------------------------------------
   BOTONES
   ---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 10px var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: .01em;
}
.btn:active { transform: scale(.98); }
.btn i { font-size: 16px; }

.btn-primary {
  background: var(--color-green-500);
  color: white;
  border-color: var(--color-green-500);
  box-shadow: var(--shadow-green);
}
.btn-primary:hover {
  background: var(--color-green-600);
  border-color: var(--color-green-600);
  color: white;
  box-shadow: 0 6px 20px rgba(34,160,90,.35);
  transform: translateY(-1px);
}

.btn-secondary {
  background: white;
  color: var(--color-text);
  border-color: var(--color-border);
  box-shadow: var(--shadow-xs);
}
.btn-secondary:hover {
  background: var(--color-bg);
  border-color: var(--color-green-300);
  color: var(--color-text);
}

.btn-danger {
  background: var(--color-danger);
  color: white;
  border-color: var(--color-danger);
}
.btn-danger:hover {
  background: #b91c1c;
  border-color: #b91c1c;
  color: white;
  transform: translateY(-1px);
}

.btn-warning {
  background: var(--color-warning);
  color: white;
  border-color: var(--color-warning);
}
.btn-warning:hover {
  background: #b45309;
  border-color: #b45309;
  color: white;
}

.btn-outline {
  background: transparent;
  color: var(--color-green-600);
  border-color: var(--color-green-400);
}
.btn-outline:hover {
  background: var(--color-green-50);
  color: var(--color-green-700);
}

.btn-sm {
  padding: 6px 12px;
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
}
.btn-lg {
  padding: 14px 28px;
  font-size: var(--font-size-md);
  border-radius: var(--radius-lg);
}

.btn-icon {
  padding: 8px;
  border-radius: var(--radius-sm);
}

/* ----------------------------------------------------------------
   FORMULARIOS
   ---------------------------------------------------------------- */
.form-group {
  margin-bottom: var(--space-5);
}
.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.form-label .required {
  color: var(--color-danger);
  margin-left: 3px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: white;
  color: var(--color-text);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-control:focus {
  outline: none;
  border-color: var(--color-green-400);
  box-shadow: 0 0 0 3px rgba(34,160,90,.12);
}
.form-control::placeholder { color: var(--color-text-light); }
.form-control:disabled {
  background: var(--color-bg-alt);
  cursor: not-allowed;
  opacity: .7;
}

select.form-control {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24'%3E%3Cpath stroke='%23637068' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 36px;
}

textarea.form-control { resize: vertical; min-height: 100px; }

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-danger);
  margin-top: var(--space-1);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-5);
}

/* ----------------------------------------------------------------
   TARJETAS
   ---------------------------------------------------------------- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.card-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.card-header h2, .card-header h3 {
  font-size: var(--font-size-lg);
  margin: 0;
}
.card-body {
  padding: var(--space-6);
}
.card-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

/* ----------------------------------------------------------------
   ALERTAS / MENSAJES
   ---------------------------------------------------------------- */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-5);
  border: 1px solid transparent;
  animation: slideDown .3s ease;
}
.alert i { font-size: 18px; flex-shrink: 0; margin-top: 1px; }

.alert-success {
  background: var(--color-success-bg);
  border-color: var(--color-green-200);
  color: var(--color-green-800);
}
.alert-warning {
  background: var(--color-warning-bg);
  border-color: #fde68a;
  color: #92400e;
}
.alert-danger {
  background: var(--color-danger-bg);
  border-color: #fca5a5;
  color: #991b1b;
}
.alert-info {
  background: var(--color-info-bg);
  border-color: #bae6fd;
  color: #0c4a6e;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ----------------------------------------------------------------
   BADGES / ETIQUETAS
   ---------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .03em;
  text-transform: uppercase;
}
.badge-success { background: var(--color-green-100); color: var(--color-green-700); }
.badge-warning { background: var(--color-amber-100); color: #92400e; }
.badge-danger  { background: var(--color-danger-light); color: #991b1b; }
.badge-info    { background: #dbeafe; color: #1e3a8a; }
.badge-gray    { background: #f3f4f6; color: #4b5563; }

/* ----------------------------------------------------------------
   TABLAS
   ---------------------------------------------------------------- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}
.table th {
  padding: 12px var(--space-4);
  text-align: left;
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--color-text-muted);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}
.table td {
  padding: 13px var(--space-4);
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}
.table tr:last-child td { border-bottom: none; }
.table tbody tr {
  transition: background var(--transition-fast);
}
.table tbody tr:hover { background: var(--color-bg); }

/* ----------------------------------------------------------------
   PAGINACIÓN
   ---------------------------------------------------------------- */
.pagination {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  justify-content: center;
  padding: var(--space-4) 0;
}
.pagination a, .pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
  transition: all var(--transition-fast);
}
.pagination a:hover {
  background: var(--color-green-50);
  border-color: var(--color-green-300);
  color: var(--color-green-700);
}
.pagination .active {
  background: var(--color-green-500);
  border-color: var(--color-green-500);
  color: white;
  font-weight: 700;
}
.pagination .disabled {
  opacity: .4;
  cursor: default;
  pointer-events: none;
}

/* ----------------------------------------------------------------
   MODAL DE CONFIRMACIÓN
   ---------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}
.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}
.modal {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  max-width: 440px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  transform: scale(.95) translateY(10px);
  transition: transform var(--transition-normal);
}
.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}
.modal-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  font-size: 24px;
}
.modal-icon.danger { background: var(--color-danger-bg); color: var(--color-danger); }
.modal-icon.warning { background: var(--color-warning-bg); color: var(--color-warning); }
.modal h3 { text-align: center; margin-bottom: var(--space-3); }
.modal p { text-align: center; color: var(--color-text-muted); margin-bottom: var(--space-6); }
.modal-actions { display: flex; gap: var(--space-3); justify-content: center; }

/* ----------------------------------------------------------------
   LOADING / SKELETON
   ---------------------------------------------------------------- */
.skeleton {
  background: linear-gradient(90deg, var(--color-bg) 25%, var(--color-bg-alt) 50%, var(--color-bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ----------------------------------------------------------------
   BREADCRUMB
   ---------------------------------------------------------------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}
.breadcrumb a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}
.breadcrumb a:hover { color: var(--color-green-600); }
.breadcrumb .sep { color: var(--color-border); }
.breadcrumb .current { color: var(--color-text); font-weight: 500; }

/* ----------------------------------------------------------------
   EMPTY STATE
   ---------------------------------------------------------------- */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-6);
  color: var(--color-text-muted);
}
.empty-state i {
  font-size: 48px;
  color: var(--color-border);
  margin-bottom: var(--space-4);
}
.empty-state h3 {
  color: var(--color-text);
  margin-bottom: var(--space-3);
  font-size: var(--font-size-lg);
}
.empty-state p { margin-bottom: var(--space-6); }

/* ----------------------------------------------------------------
   UTILIDADES
   ---------------------------------------------------------------- */
.text-sm    { font-size: var(--font-size-sm); }
.text-xs    { font-size: var(--font-size-xs); }
.text-lg    { font-size: var(--font-size-lg); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-danger  { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }

.d-flex         { display: flex; }
.align-center   { align-items: center; }
.justify-between{ justify-content: space-between; }
.gap-2          { gap: var(--space-2); }
.gap-3          { gap: var(--space-3); }
.gap-4          { gap: var(--space-4); }
.flex-wrap      { flex-wrap: wrap; }

.mt-4  { margin-top: var(--space-4); }
.mt-6  { margin-top: var(--space-6); }
.mb-4  { margin-bottom: var(--space-4); }
.mb-6  { margin-bottom: var(--space-6); }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ----------------------------------------------------------------
   IMPRESIÓN
   ---------------------------------------------------------------- */
@media print {
  .no-print { display: none !important; }
  body { background: white; }
  .card { box-shadow: none; border: 1px solid #ccc; }
}