:root {
  --azul:      #1a56db;
  --azul-dark: #1e429f;
  --verde:     #057a55;
  --amarillo:  #c27803;
  --rojo:      #c81e1e;
  --gris:      #f3f4f6;
  --borde:     #d1d5db;
  --texto:     #111827;
  --texto2:    #6b7280;
  --blanco:    #ffffff;
  --sombra:    0 1px 4px rgba(0,0,0,.10);
}

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

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: #f0f2f5;
  color: var(--texto);
  font-size: 15px;
}

/* HEADER */
header {
  background: var(--azul);
  color: var(--blanco);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  box-shadow: var(--sombra);
}
header h1 { font-size: 1.1rem; font-weight: 700; letter-spacing: .5px; }
header span { font-size: .85rem; opacity: .8; }

/* TABS */
.tabs {
  display: flex;
  background: var(--blanco);
  border-bottom: 2px solid var(--borde);
  padding: 0 24px;
}
.tabs button {
  border: none; background: none; cursor: pointer;
  padding: 14px 22px; font-size: .92rem; color: var(--texto2);
  border-bottom: 3px solid transparent; margin-bottom: -2px;
  transition: color .2s;
}
.tabs button.active {
  color: var(--azul); border-bottom-color: var(--azul);
  font-weight: 600;
}

/* CONTENIDO */
main { max-width: 1100px; margin: 0 auto; padding: 24px 20px; }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* CARDS */
.card {
  background: var(--blanco);
  border-radius: 10px;
  box-shadow: var(--sombra);
  padding: 22px 24px;
  margin-bottom: 18px;
}
.card h2 {
  font-size: 1rem; font-weight: 700; margin-bottom: 16px;
  color: var(--azul-dark); border-bottom: 1px solid var(--gris); padding-bottom: 10px;
}

/* GRID FORMULARIO */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
}
.form-group label {
  display: block; font-size: .82rem; font-weight: 600;
  color: var(--texto2); margin-bottom: 5px;
}
.form-group input, .form-group select {
  width: 100%; padding: 9px 12px;
  border: 1px solid var(--borde); border-radius: 7px;
  font-size: .95rem; color: var(--texto);
  transition: border .2s;
}
.form-group input:focus, .form-group select:focus {
  outline: none; border-color: var(--azul);
}

/* BOTONES */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border: none; border-radius: 8px;
  font-size: .92rem; font-weight: 600; cursor: pointer;
  transition: background .2s;
}
.btn-primary { background: var(--azul); color: var(--blanco); }
.btn-primary:hover { background: var(--azul-dark); }
.btn-success { background: var(--verde); color: var(--blanco); }
.btn-secondary { background: var(--gris); color: var(--texto); border: 1px solid var(--borde); }
.btn-danger { background: var(--rojo); color: var(--blanco); }
.btn-sm { padding: 6px 12px; font-size: .82rem; }

.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }

/* CARTON ROWS */
.carton-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr auto;
  gap: 10px; align-items: end;
  padding: 10px;
  background: var(--gris); border-radius: 7px; margin-top: 8px;
}

/* RESULTADOS */
.resultado-box {
  display: none;
  margin-top: 18px;
}
.resultado-box.visible { display: block; }

.resultado-trailes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px; margin-bottom: 16px;
}
.traile-card {
  border-radius: 8px; padding: 16px; text-align: center;
  border: 2px solid transparent;
}
.traile-card.t30 { background: #ecfdf5; border-color: #6ee7b7; }
.traile-card.t24 { background: #eff6ff; border-color: #93c5fd; }
.traile-card.t22 { background: #fff7ed; border-color: #fcd34d; }
.traile-card .num { font-size: 2.4rem; font-weight: 800; }
.traile-card .label { font-size: .82rem; color: var(--texto2); margin-top: 4px; }

.uso-bar-wrap { margin: 12px 0; }
.uso-bar-track {
  background: var(--gris); border-radius: 999px; height: 14px; overflow: hidden;
}
.uso-bar-fill {
  height: 100%; border-radius: 999px;
  background: linear-gradient(90deg, var(--verde), var(--azul));
  transition: width 1s ease;
}

/* DESGLOSE TABLE */
.desglose-table {
  width: 100%; border-collapse: collapse; font-size: .88rem;
}
.desglose-table th {
  background: var(--gris); text-align: left;
  padding: 8px 12px; font-size: .8rem; color: var(--texto2);
}
.desglose-table td { padding: 8px 12px; border-bottom: 1px solid var(--gris); }
.desglose-table tr:last-child td { border-bottom: none; }

/* HISTORIAL */
.historial-filtros {
  display: flex; flex-wrap: wrap; gap: 10px;
  align-items: flex-end; margin-bottom: 16px;
}
.historial-filtros .form-group { flex: 1; min-width: 150px; }
.historial-table-wrap { overflow-x: auto; }
.historial-table {
  width: 100%; border-collapse: collapse; font-size: .88rem;
}
.historial-table th {
  background: var(--gris); padding: 10px 12px;
  text-align: left; font-size: .8rem; color: var(--texto2);
}
.historial-table td { padding: 10px 12px; border-bottom: 1px solid var(--gris); }
.historial-table tr:hover td { background: #f9fafb; }
.badge {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: .75rem; font-weight: 600;
}
.badge-verde { background: #d1fae5; color: #065f46; }
.badge-azul  { background: #dbeafe; color: #1e40af; }
.badge-naranja { background: #fef3c7; color: #92400e; }

/* DASHBOARD */
.dash-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 16px; margin-bottom: 20px; }
.dash-stat {
  background: var(--blanco); border-radius: 10px; box-shadow: var(--sombra);
  padding: 18px; text-align: center;
}
.dash-stat .val { font-size: 2rem; font-weight: 800; color: var(--azul); }
.dash-stat .lbl { font-size: .82rem; color: var(--texto2); margin-top: 4px; }

/* MENSAJES */
.msg { padding: 12px 16px; border-radius: 8px; margin: 12px 0; font-size: .9rem; }
.msg-error   { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.msg-success { background: #d1fae5; color: #065f46; border: 1px solid #6ee7b7; }
.msg-info    { background: #dbeafe; color: #1e40af; border: 1px solid #93c5fd; }

/* SPINNER */
.spinner { display: none; text-align: center; padding: 20px; }
.spinner.visible { display: block; }

/* ZONA DE CARGA EXCEL */
.upload-zone {
  border: 2px dashed var(--borde);
  border-radius: 10px;
  padding: 22px;
  text-align: center;
  background: var(--gris);
  cursor: pointer;
  transition: border-color .2s, background .2s;
  position: relative;
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--azul);
  background: #eff6ff;
}
.upload-zone input[type=file] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer;
}
.upload-zone .uz-icon { font-size: 2rem; margin-bottom: 6px; }
.upload-zone p { font-size: .88rem; color: var(--texto2); margin: 0; }
.upload-zone strong { color: var(--azul); }

.upload-result {
  margin-top: 12px; font-size: .88rem;
}
.upload-result ul {
  margin: 6px 0 0 16px; color: var(--rojo);
}

/* RESPONSIVE */
@media (max-width: 600px) {
  main { padding: 12px; }
  .form-grid { grid-template-columns: 1fr 1fr; }
  .carton-row { grid-template-columns: 1fr 1fr; }
  .carton-row .btn { grid-column: 2; }
  .tabs button { padding: 12px 14px; font-size: .82rem; }
}