/* =====================================================================
   Panel Administrativo - layout
   ===================================================================== */

.pantalla-login {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--op-azul, #0d3b66) 0%, var(--op-azul-claro, #1b5faa) 60%, #2f7fd1 100%);
}

.admin-body {
  background: #f1f3f7;
}

.admin-layout {
  display: flex;
  min-height: 100vh;
}

.admin-sidebar {
  width: 250px;
  flex-shrink: 0;
  background: linear-gradient(180deg, #0d3b66 0%, #123a5e 100%);
  color: #fff;
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
}

.admin-sidebar-brand {
  display: flex;
  align-items: center;
  gap: .65rem;
  padding: 1.1rem 1.2rem;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
  font-size: 1.4rem;
}
.admin-sidebar-brand .logo-imagen {
  width: 32px;
  height: 32px;
  object-fit: contain;
  border-radius: .4rem;
}

.admin-nav {
  flex-grow: 1;
  padding: .75rem .6rem;
  overflow-y: auto;
}

.admin-nav-link {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .6rem .75rem;
  border-radius: .5rem;
  color: rgba(255, 255, 255, .82);
  text-decoration: none;
  font-size: .9rem;
  margin-bottom: .15rem;
  transition: background .15s ease;
}
.admin-nav-link i { font-size: 1.05rem; width: 1.2rem; text-align: center; }
.admin-nav-link:hover { background: rgba(255, 255, 255, .08); color: #fff; }
.admin-nav-link.activo { background: rgba(255, 255, 255, .16); color: #fff; font-weight: 600; }
.admin-nav-link.deshabilitado { opacity: .5; cursor: not-allowed; }
.admin-nav-link.deshabilitado:hover { background: none; }

.admin-sidebar-footer {
  padding: .75rem .6rem;
  border-top: 1px solid rgba(255, 255, 255, .1);
}

.admin-contenido {
  flex-grow: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.admin-topbar {
  background: #fff;
  border-bottom: 1px solid #e5e8ee;
  padding: .85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 10;
}

.admin-main {
  padding: 1.5rem;
  flex-grow: 1;
}

.avatar-usuario {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--op-azul, #0d3b66);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .8rem;
}

/* --- Tarjetas de estadisticas ------------------------------------------ */
.tarjeta-stat {
  background: #fff;
  border-radius: .85rem;
  border: 1px solid #e5e8ee;
  padding: 1.1rem 1.3rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 100%;
}
.tarjeta-stat .icono {
  width: 48px;
  height: 48px;
  border-radius: .65rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: #fff;
  flex-shrink: 0;
}
.tarjeta-stat .valor {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a1a2e;
  line-height: 1.1;
}
.tarjeta-stat .etiqueta {
  font-size: .78rem;
  color: #6c757d;
}

.panel-grafico {
  background: #fff;
  border-radius: .85rem;
  border: 1px solid #e5e8ee;
  padding: 1.25rem;
  height: 100%;
}

/* --- Zona de arrastrar (subida de dataset) ------------------------------- */
.zona-arrastrar {
  border: 2px dashed #c7cedb;
  border-radius: .85rem;
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease;
  background: #fafbfc;
}
.zona-arrastrar:hover,
.zona-arrastrar.arrastrando {
  border-color: var(--op-azul-claro, #1b5faa);
  background: #eef4fb;
}

.item-validacion {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .35rem 0;
  font-size: .88rem;
}
.item-validacion.ok { color: #1e8e5a; }
.item-validacion.advertencia { color: #b8860b; }

/* --- Responsive ---------------------------------------------------------- */
@media (max-width: 991.98px) {
  .admin-sidebar {
    position: fixed;
    left: -260px;
    z-index: 1050;
    transition: left .2s ease;
    box-shadow: 4px 0 18px rgba(0, 0, 0, .25);
  }
  .admin-layout.sidebar-abierto .admin-sidebar {
    left: 0;
  }
}