:root {
  /* Color corporativo Grupo KH: #8c181a */
  --primary: #8c181a;
  --primary-light: #a52226;
  --primary-dark: #5e0f11;
  --accent: #8c181a;
  --accent-hover: #a52226;
  --success: #27ae60;
  --warning: #f39c12;
  --danger: #e74c3c;
  --bg: #f5f6fa;
  --card-bg: #ffffff;
  --text: #2c3e50;
  --text-secondary: #7f8c8d;
  --border: #dcdde1;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* Layout */
.app { display: flex; min-height: 100vh; }

.sidebar {
  width: 240px;
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--primary) 40%, var(--primary-dark) 100%);
  color: #fff;
  padding: 20px 0;
  flex-shrink: 0;
}

.sidebar h1 {
  font-size: 18px;
  padding: 0 20px 10px;
  border-bottom: 1px solid rgba(255,255,255,0.15);
  margin-bottom: 10px;
}

.sidebar .logo {
  display: block;
  width: 170px;
  margin: 0 auto 6px;
}

.sidebar h1 small {
  display: block;
  font-size: 11px;
  font-weight: normal;
  opacity: 0.6;
  margin-top: 2px;
}

.sidebar nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.2s;
}

.sidebar nav a:hover,
.sidebar nav a.active {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.sidebar nav a .icon { font-size: 18px; width: 24px; text-align: center; }

.main {
  flex: 1;
  padding: 24px;
  max-width: 1200px;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 10px;
  border-bottom: 3px solid;
  border-image: linear-gradient(90deg, var(--primary), var(--primary-light) 40%, transparent) 1;
}

.page-header h2 { font-size: 22px; }

/* Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.stat-card .label { font-size: 12px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; }
.stat-card .value { font-size: 28px; font-weight: 700; margin-top: 4px; }
.stat-card .value.accent { color: var(--accent); }
.stat-card .value.success { color: var(--success); }
.stat-card .value.warning { color: var(--warning); }

/* Table */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  /* sin overflow:hidden — rompería position:sticky de las cabeceras de tabla */
}

.card > .table-scroll:last-child tr:last-child td:first-child { border-bottom-left-radius: var(--radius); }
.card > .table-scroll:last-child tr:last-child td:last-child { border-bottom-right-radius: var(--radius); }

/* Contenedor de scroll horizontal para tablas anchas (sobre todo en móvil) */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.card-header h3 { font-size: 16px; }

.filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filters input,
.filters select {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

th {
  background: #f8f9fa;
  text-align: left;
  padding: 10px 16px;
  font-size: 11px;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.5px;
  border-bottom: 2px solid var(--primary);
  /* Cabecera fija al hacer scroll */
  position: sticky;
  top: 0;
  z-index: 5;
}

td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

tr:hover td { background: #f8f9fa; }

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
}

.badge.pendiente { background: #ffeaa7; color: #d35400; }
.badge.generado { background: #dfe6e9; color: var(--primary); }
.badge.enviado { background: #d5f5e3; color: #1e8449; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary { background: linear-gradient(135deg, var(--primary-light), var(--primary-dark)); color: #fff; }
.btn-primary:hover { background: linear-gradient(135deg, var(--primary-light), var(--primary)); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #2ecc71; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: #f8f9fa; }

.btn-group { display: flex; gap: 6px; }

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  padding: 20px;
}

.form-group { display: flex; flex-direction: column; gap: 4px; }

.form-group label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 14px;
  font-family: inherit;
  /* width:100% + min-width:0 evitan que un <select> con opciones largas
     ensanche la columna del grid y desborde en móvil */
  width: 100%;
  min-width: 0;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(41,128,185,0.2);
}

.form-group.modified input { border-color: var(--warning); background: #fffbf0; }

.form-actions {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* Section titles in forms */
.section-title {
  grid-column: 1 / -1;
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  padding: 8px 0 0;
  border-bottom: 2px solid var(--primary);
  margin-bottom: -8px;
}

/* PDF preview */
.pdf-preview {
  padding: 20px;
  text-align: center;
}

.pdf-preview iframe {
  width: 100%;
  height: 600px;
  border: 1px solid var(--border);
  border-radius: 4px;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 16px;
}

/* Modal */
/* El display:flex de abajo anula el display:none que aporta el atributo hidden */
.modal-overlay[hidden] {
  display: none;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal {
  background: var(--card-bg);
  border-radius: var(--radius);
  width: 90%;
  max-width: 700px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-close {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text-secondary);
}

/* Toast */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: 4px;
  color: #fff;
  font-size: 14px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  animation: slideIn 0.3s ease;
}

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

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

/* Responsive — tablet/móvil: la barra lateral pasa a barra superior */
@media (max-width: 900px) {
  .app { flex-direction: column; }

  .sidebar {
    width: 100%;
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 4px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .sidebar h1 {
    border-bottom: none;
    padding: 0 8px 0 14px;
    margin-bottom: 0;
    font-size: 0; /* oculta el texto largo, deja solo el logo */
    flex-shrink: 0;
    display: flex;
    align-items: center;
  }
  .sidebar h1 small { display: none; }
  .sidebar .logo { width: auto; height: 30px; margin: 0; }

  .sidebar nav {
    display: flex;
    flex: 1;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .sidebar nav a {
    flex-direction: column;
    gap: 2px;
    padding: 6px 14px;
    font-size: 11px;
    white-space: nowrap;
  }
  .sidebar nav a .icon { font-size: 20px; width: auto; }

  .main { padding: 14px; max-width: 100%; }

  .page-header { flex-wrap: wrap; gap: 8px; }
  .page-header h2 { font-size: 19px; }

  /* Grupos de botones de acción (cabecera de detalle): que envuelvan en varias filas */
  .btn-group { flex-wrap: wrap; }
}

/* Móvil estricto */
@media (max-width: 600px) {
  .main { padding: 12px; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat-card { padding: 14px; }
  .stat-card .value { font-size: 22px; }

  .form-grid { grid-template-columns: 1fr; padding: 16px; }

  .card-header { padding: 12px 14px; }
  .filters { width: 100%; }
  .filters input,
  .filters select { flex: 1 1 auto; min-width: 0; }

  th, td { padding: 8px 10px; }

  /* El botón de la cabecera de la tarjeta no debe desbordar */
  .card-header .btn { flex-shrink: 0; }

  .modal { width: 94%; }
  .form-actions { flex-direction: column-reverse; }
  .form-actions .btn { width: 100%; justify-content: center; }

  .pdf-preview iframe { height: 70vh; }
}