diff --git a/src/components/archivos/DetailDialog.tsx b/src/components/archivos/DetailDialog.tsx
new file mode 100644
index 0000000..c0adbad
--- /dev/null
+++ b/src/components/archivos/DetailDialog.tsx
@@ -0,0 +1,171 @@
+import { useEffect, useState } from "react"
+import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle } from "@/components/ui/dialog"
+import { Badge } from "@/components/ui/badge"
+import { Label } from "@/components/ui/label"
+import { Button } from "@/components/ui/button"
+import * as Icons from "lucide-react"
+import type { RefRow } from "@/types/RefRow"
+
+// POST -> recibe blob PDF y (opcional) Content-Disposition
+async function fetchPdfBlob(url: string, body: { s3_file_path: string }) {
+    const res = await fetch(url, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(body),
+    })
+    if (!res.ok) throw new Error(await res.text())
+    const blob = await res.blob()
+    return { blob, disposition: res.headers.get("content-disposition") ?? undefined }
+}
+
+function filenameFromDisposition(disposition?: string, fallback = "archivo.pdf") {
+    if (!disposition) return fallback
+    const star = /filename\*\=UTF-8''([^;]+)/i.exec(disposition)?.[1]
+    if (star) return decodeURIComponent(star)
+    const simple = /filename\=\"?([^\";]+)\"?/i.exec(disposition)?.[1]
+    return simple ?? fallback
+}
+
+export function DetailDialog({
+    row,
+    onClose,
+    pdfUrl = "/api/get/documento", // ← permite inyectar el endpoint
+}: {
+    row: RefRow | null
+    onClose: () => void
+    pdfUrl?: string
+}) {
+    const [viewerUrl, setViewerUrl] = useState<string | null>(null)
+    const [currentBlob, setCurrentBlob] = useState<Blob | null>(null)
+    const [filename, setFilename] = useState<string>("archivo.pdf")
+    const open = !!row
+
+    useEffect(() => {
+        if (!open) return
+
+        let revoked = false
+        let urlToRevoke: string | null = null
+        const ctrl = new AbortController()
+
+        async function load() {
+            if (!row?.s3_file_path) {
+                setViewerUrl(null)
+                setCurrentBlob(null)
+                return
+            }
+            try {
+                const { blob, disposition } = await fetchPdfBlob(`${import.meta.env.VITE_BACK_ORIGIN}/api/get/documento`, { s3_file_path: row.s3_file_path })
+                if (ctrl.signal.aborted) return
+                const name = row.titulo_archivo ? `${row.titulo_archivo}.pdf` : filenameFromDisposition(disposition)
+                setFilename(name)
+                const url = URL.createObjectURL(blob)
+                urlToRevoke = url
+                if (!revoked) {
+                    setViewerUrl(url)
+                    setCurrentBlob(blob)
+                }
+            } catch (e) {
+                console.error("Carga de PDF falló:", e)
+                setViewerUrl(null)
+                setCurrentBlob(null)
+            }
+        }
+
+        load()
+
+        return () => {
+            revoked = true
+            ctrl.abort()
+            if (urlToRevoke) URL.revokeObjectURL(urlToRevoke)
+        }
+    }, [open, row?.s3_file_path, row?.titulo_archivo, pdfUrl])
+
+    async function downloadFile() {
+        try {
+            // Si ya tenemos el blob, úsalo
+            if (currentBlob) {
+                const link = document.createElement("a")
+                const href = URL.createObjectURL(currentBlob)
+                link.href = href
+                link.download = filename
+                link.click()
+                URL.revokeObjectURL(href)
+                return
+            }
+
+            // Si no, vuelve a pedirlo (p. ej., si el user abre y descarga sin render previo)
+            if (!row?.s3_file_path) throw new Error("No hay contenido para descargar.")
+            const { blob, disposition } = await fetchPdfBlob(`${import.meta.env.VITE_BACK_ORIGIN}/api/get/documento`, { s3_file_path: row.s3_file_path })
+            const name = row.titulo_archivo ? `${row.titulo_archivo}.pdf` : filenameFromDisposition(disposition)
+            const link = document.createElement("a")
+            const href = URL.createObjectURL(blob)
+            link.href = href
+            link.download = name
+            link.click()
+            URL.revokeObjectURL(href)
+        } catch (error) {
+            console.error("Error al descargar el archivo:", error)
+            alert("No se pudo descargar el archivo.")
+        }
+    }
+
+    return (
+        <Dialog open={open} onOpenChange={(o) => !o && onClose()}>
+            <DialogContent className="max-w-3xl">
+                <DialogHeader>
+                    <DialogTitle className="font-mono">{row?.titulo_archivo ?? "(Sin título)"}</DialogTitle>
+                    <DialogDescription>{row?.descripcion || "Sin descripción"}</DialogDescription>
+                </DialogHeader>
+
+                {row && (
+                    <div className="space-y-3">
+                        <div className="text-xs flex flex-wrap gap-2">
+                            <Badge variant="outline">{row.tipo_contenido ?? "—"}</Badge>
+                            <Badge variant="outline">{row.interno ? "Interno" : "Externo"}</Badge>
+                            <Badge variant="outline">{row.procesado ? "Procesado" : "Pendiente"}</Badge>
+                            {row.fuente_autoridad && <Badge variant="outline">{row.fuente_autoridad}</Badge>}
+                            {row.fecha_subida && (
+                                <span className="inline-flex items-center gap-1">
+                                    <Icons.CalendarClock className="w-3 h-3" />
+                                    {new Date(row.fecha_subida).toLocaleString()}
+                                </span>
+                            )}
+                        </div>
+
+                        {row.tags?.length ? (
+                            <div className="text-xs text-neutral-600">
+                                <span className="font-medium">Tags: </span>
+                                {row.tags.join(", ")}
+                            </div>
+                        ) : null}
+
+                        <div>
+                            <Label className="text-xs text-neutral-600">Instrucciones</Label>
+                            <div className="mt-1 rounded-xl border bg-white/60 p-3 text-sm whitespace-pre-wrap">
+                                {row.instrucciones || "—"}
+                            </div>
+                        </div>
+
+                        <div>
+                            <Label className="text-xs text-neutral-600">Contenido (PDF)</Label>
+                            {viewerUrl ? (
+                                <iframe
+                                    className="mt-1 rounded-xl border bg-neutral-950 text-neutral-100 w-full h-[360px]"
+                                    src={viewerUrl}
+                                    title="PDF Viewer"
+                                />
+                            ) : (
+                                <div className="mt-1 rounded-xl border p-3 text-sm text-neutral-600">No se pudo cargar el PDF.</div>
+                            )}
+                        </div>
+                    </div>
+                )}
+
+                <DialogFooter>
+                    <Button variant="outline" onClick={downloadFile}>Descargar</Button>
+                    <Button onClick={onClose}>Cerrar</Button>
+                </DialogFooter>
+            </DialogContent>
+        </Dialog>
+    )
+}
diff --git a/src/components/carreras/DeleteCarreras.tsx b/src/components/carreras/DeleteCarreras.tsx
index 0ba0579..85ebd65 100644
--- a/src/components/carreras/DeleteCarreras.tsx
+++ b/src/components/carreras/DeleteCarreras.tsx
@@ -3,7 +3,6 @@ import { useQueryClient } from "@tanstack/react-query";
 import { useRouter } from "@tanstack/react-router";
 import { useState } from "react";
 import { Button } from "../ui/button";
-import { Trash } from "lucide-react";
 import { carrerasKeys } from "@/routes/_authenticated/carreras";
 import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription, DialogFooter } from "../ui/dialog";
 
diff --git a/src/components/planes/AddAsignaturaButton.tsx b/src/components/planes/AddAsignaturaButton.tsx
index 7e189da..28a9b80 100644
--- a/src/components/planes/AddAsignaturaButton.tsx
+++ b/src/components/planes/AddAsignaturaButton.tsx
@@ -57,7 +57,7 @@ export function AddAsignaturaButton({ planId, onAdded }: { planId: string; onAdd
     if (!canIA) return
     setSaving(true)
     try {
-      const res = await fetch("https://genesis-engine.apps.lci.ulsa.mx/api/generar/asignatura", {
+      const res = await fetch(`${import.meta.env.VITE_BACK_ORIGIN}/api/generar/asignatura`, {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({ planEstudiosId: planId, prompt: iaPrompt, semestre: iaSemestre.trim() ? Number(iaSemestre) : undefined, insert: true }),
diff --git a/src/components/planes/AdjustAIButton.tsx b/src/components/planes/AdjustAIButton.tsx
index 395a434..a36c172 100644
--- a/src/components/planes/AdjustAIButton.tsx
+++ b/src/components/planes/AdjustAIButton.tsx
@@ -14,7 +14,7 @@ export function AdjustAIButton({ plan }: { plan: PlanFull }) {
 
   async function apply() {
     setLoading(true)
-    await fetch('https://genesis-engine.apps.lci.ulsa.mx/api/mejorar/plan', {
+    await fetch(`${import.meta.env.VITE_BACK_ORIGIN}/api/mejorar/plan`, {
       method: 'POST', headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({ prompt, plan_id: plan.id }),
     }).catch(() => { })
diff --git a/src/lib/api.ts b/src/lib/api.ts
index ed76dce..28223e0 100644
--- a/src/lib/api.ts
+++ b/src/lib/api.ts
@@ -1,7 +1,7 @@
 // api.ts
 const API_BASE =
   (import.meta.env.VITE_API_BASE?.replace(/\/$/, "")) ||
-  "https://genesis-engine.apps.lci.ulsa.mx"; // 👈 tu Bun.serve real
+  `${import.meta.env.VITE_BACK_ORIGIN}`; // 👈 tu Bun.serve real
 
 export async function postAPI<T=any>(path: string, body: any): Promise<T> {
   const url = `${API_BASE}${path}`;
diff --git a/src/routes/_authenticated/archivos.tsx b/src/routes/_authenticated/archivos.tsx
index f54a322..d7efef5 100644
--- a/src/routes/_authenticated/archivos.tsx
+++ b/src/routes/_authenticated/archivos.tsx
@@ -13,21 +13,9 @@ import {
 } from "@/components/ui/dialog"
 import { Textarea } from "@/components/ui/textarea"
 import { Select, SelectTrigger, SelectContent, SelectItem, SelectValue } from "@/components/ui/select"
+import { DetailDialog } from "@/components/archivos/DetailDialog"
 
-type RefRow = {
-  fine_tuning_referencias_id: string
-  titulo_archivo: string | null
-  descripcion: string | null
-  contenido_archivo: any | null
-  tipo_contenido: string | null
-  fecha_subida: string | null
-  procesado: boolean | null
-  tags: string[] | null
-  fuente_autoridad: string | null
-  interno: boolean | null
-  instrucciones: string
-  created_by: string | null
-}
+import type { RefRow } from "@/types/RefRow"
 
 export const Route = createFileRoute("/_authenticated/archivos")({
   component: RouteComponent,
@@ -200,63 +188,6 @@ function RouteComponent() {
   )
 }
 
-/* ========= Detalle ========= */
-function DetailDialog({ row, onClose }: { row: RefRow | null; onClose: () => void }) {
-  return (
-    <Dialog open={!!row} onOpenChange={(o) => !o && onClose()}>
-      <DialogContent className="max-w-3xl">
-        <DialogHeader>
-          <DialogTitle className="font-mono" >{row?.titulo_archivo ?? "(Sin título)"}</DialogTitle>
-          <DialogDescription>
-            {row?.descripcion || "Sin descripción"}
-          </DialogDescription>
-        </DialogHeader>
-
-        {row && (
-          <div className="space-y-3">
-            <div className="text-xs flex flex-wrap gap-2">
-              <Badge variant="outline">{row.tipo_contenido ?? "—"}</Badge>
-              <Badge variant="outline">{row.interno ? "Interno" : "Externo"}</Badge>
-              <Badge variant="outline">{row.procesado ? "Procesado" : "Pendiente"}</Badge>
-              {row.fuente_autoridad && <Badge variant="outline">{row.fuente_autoridad}</Badge>}
-              {row.fecha_subida && (
-                <span className="inline-flex items-center gap-1">
-                  <Icons.CalendarClock className="w-3 h-3" />
-                  {new Date(row.fecha_subida).toLocaleString()}
-                </span>
-              )}
-            </div>
-
-            {row.tags && row.tags.length > 0 && (
-              <div className="text-xs text-neutral-600">
-                <span className="font-medium">Tags: </span>{row.tags.join(", ")}
-              </div>
-            )}
-
-            <div>
-              <Label className="text-xs text-neutral-600">Instrucciones</Label>
-              <div className="mt-1 rounded-xl border bg-white/60 p-3 text-sm whitespace-pre-wrap">
-                {row.instrucciones || "—"}
-              </div>
-            </div>
-
-            <div>
-              <Label className="text-xs text-neutral-600">Contenido (JSON)</Label>
-              <pre className="mt-1 rounded-xl border bg-neutral-950 text-neutral-100 p-3 max-h-[360px] overflow-auto text-xs">
-                {JSON.stringify(row.contenido_archivo ?? {}, null, 2)}
-              </pre>
-            </div>
-          </div>
-        )}
-
-        <DialogFooter>
-          <Button onClick={onClose}>Cerrar</Button>
-        </DialogFooter>
-      </DialogContent>
-    </Dialog>
-  )
-}
-
 /* ========= Subida ========= */
 function UploadDialog({
   open, onOpenChange, onDone,
@@ -284,7 +215,7 @@ function UploadDialog({
     try {
       const fileBase64 = await toBase64(file)
       // Enviamos al motor (inserta en la tabla si insert=true)
-      const res = await fetch("https://genesis-engine.apps.lci.ulsa.mx/api/upload/documento", {
+      const res = await fetch(`${import.meta.env.VITE_BACK_ORIGIN}/api/upload/documento`, {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({
diff --git a/src/routes/_authenticated/asignatura/$asignaturaId.tsx b/src/routes/_authenticated/asignatura/$asignaturaId.tsx
index ff8401c..c48b842 100644
--- a/src/routes/_authenticated/asignatura/$asignaturaId.tsx
+++ b/src/routes/_authenticated/asignatura/$asignaturaId.tsx
@@ -504,7 +504,7 @@ function MejorarAIButton({ asignaturaId, onApply }: {
   async function apply() {
     setLoading(true)
     try {
-      const res = await fetch("https://genesis-engine.apps.lci.ulsa.mx/api/mejorar/asignatura", {
+      const res = await fetch(`${import.meta.env.VITE_BACK_ORIGIN}/api/mejorar/asignatura`, {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({ asignatura_id: asignaturaId, prompt, insert }),
diff --git a/src/routes/_authenticated/asignaturas/$planId.tsx b/src/routes/_authenticated/asignaturas/$planId.tsx
index 36a7b62..716a74b 100644
--- a/src/routes/_authenticated/asignaturas/$planId.tsx
+++ b/src/routes/_authenticated/asignaturas/$planId.tsx
@@ -182,7 +182,7 @@ function Page() {
                 Plan
               </div>
               <DialogHeader className="p-0">
-                <DialogTitle className="font-mono"  className="truncate text-xl sm:text-2xl">{planNombre}</DialogTitle>
+                <DialogTitle className="font-mono truncate text-xl sm:text-2xl">{planNombre}</DialogTitle>
               </DialogHeader>
               <div className="mt-2 flex flex-wrap items-center gap-2 text-xs">
                 <KpiChip icon={Icons.BookOpen} label="Asignaturas" value={kpis.total} />
diff --git a/src/routes/_authenticated/plan/$planId.tsx b/src/routes/_authenticated/plan/$planId.tsx
index 479e6cf..f80a255 100644
--- a/src/routes/_authenticated/plan/$planId.tsx
+++ b/src/routes/_authenticated/plan/$planId.tsx
@@ -270,7 +270,7 @@ function AdjustAIButton({ plan }: { plan: PlanFull }) {
 
   async function apply() {
     setLoading(true)
-    await fetch('https://genesis-engine.apps.lci.ulsa.mx/api/mejorar/plan', {
+    await fetch(`${import.meta.env.VITE_BACK_ORIGIN}/api/mejorar/plan`, {
       method: 'POST', headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({ prompt, plan_id: plan.id }),
     }).catch(() => { })
@@ -462,7 +462,7 @@ function AddAsignaturaButton({ planId, onAdded }: { planId: string; onAdded?: ()
     if (!canIA) return
     setSaving(true)
     try {
-      const res = await fetch("https://genesis-engine.apps.lci.ulsa.mx/api/generar/asignatura", {
+      const res = await fetch(`${import.meta.env.VITE_BACK_ORIGIN}/api/generar/asignatura`, {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({ planEstudiosId: planId, prompt: iaPrompt, semestre: iaSemestre.trim() ? Number(iaSemestre) : undefined, insert: true }),
diff --git a/src/types/RefRow.ts b/src/types/RefRow.ts
new file mode 100644
index 0000000..496ac60
--- /dev/null
+++ b/src/types/RefRow.ts
@@ -0,0 +1,14 @@
+export type RefRow = {
+  fine_tuning_referencias_id: string
+  titulo_archivo: string | null
+  descripcion: string | null
+  s3_file_path: string | null // Added this property to match the API requirements.
+  tipo_contenido: string | null
+  fecha_subida: string | null
+  procesado: boolean | null
+  tags: string[] | null
+  fuente_autoridad: string | null
+  interno: boolean | null
+  instrucciones: string
+  created_by: string | null
+}
\ No newline at end of file