diff --git a/js/src/features/compose/controls-indicator.tsx b/js/src/features/compose/controls-indicator.tsx
index 4e855b5..6a40622 100644
--- a/js/src/features/compose/controls-indicator.tsx
+++ b/js/src/features/compose/controls-indicator.tsx
@@ -26,30 +26,37 @@ export default function ControlsIndicator({
           back
         </span>
       )}
-      <button
-        type="button"
-        onClick={() =>
-          setRecordingMode(recordingMode === "video" ? "audio" : "video")
-        }
-        title={
-          recordingMode === "video"
-            ? "Switch to audio-only"
-            : "Switch to video"
-        }
-        className="flex items-center gap-1 rounded bg-white/10 px-1.5 py-0.5 text-xs text-white/50 transition-colors hover:text-white/80"
-      >
-        {recordingMode === "video" ? (
-          <>
-            <Video className="size-3" />
-            Video
-          </>
-        ) : (
-          <>
-            <Mic className="size-3" />
-            Audio
-          </>
-        )}
-      </button>
+      {type === "new" && (
+        <span>
+          <kbd className="rounded bg-white/10 px-1.5 py-0.5 font-mono text-xs">
+            ↑↓
+          </kbd>{" "}
+          <kbd className="rounded bg-white/10 px-1.5 py-0.5 font-mono text-xs">
+            Enter
+          </kbd>{" "}
+          navigate
+        </span>
+      )}
+      <span>
+        <kbd
+          role="button"
+          onClick={() =>
+            setRecordingMode(recordingMode === "video" ? "audio" : "video")
+          }
+          title={
+            recordingMode === "video"
+              ? "Switch to audio-only"
+              : "Switch to video"
+          }
+          className="cursor-pointer rounded bg-white/10 px-1.5 py-0.5 font-mono text-xs transition-colors hover:text-white/80"
+        >
+          {recordingMode === "video" ? (
+            <><Video className="inline size-3" /> Video</>
+          ) : (
+            <><Mic className="inline size-3" /> Audio</>
+          )}
+        </kbd>
+      </span>
       <span>
         <kbd className="rounded bg-white/10 px-1.5 py-0.5 font-mono text-xs">
           Hold `
diff --git a/js/src/features/network-root.tsx b/js/src/features/network-root.tsx
index ebcf39f..0101a05 100644
--- a/js/src/features/network-root.tsx
+++ b/js/src/features/network-root.tsx
@@ -1,4 +1,5 @@
-import { useParams } from "react-router-dom";
+import { useCallback, useState } from "react";
+import { useNavigate, useParams } from "react-router-dom";
 import { List, LayoutGrid } from "lucide-react";
 import { particlePath } from "@/lib/particle-path";
 import { ParticleListView } from "@/features/particles/particle-list-view";
@@ -8,6 +9,8 @@ import ControlsIndicator from "@/features/compose/controls-indicator";
 import { ComposeOverlay } from "./compose/compose-overlay";
 import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group";
 import { useViewModeStore } from "@/stores/view-mode-store";
+import { useStreamParticles } from "@/hooks/use-stream-particles";
+import { useStreamKeyboardNav } from "@/hooks/use-stream-keyboard-nav";
 
 /**
  * Route-level component for /:networkId (index).
@@ -15,18 +18,32 @@ import { useViewModeStore } from "@/stores/view-mode-store";
  */
 export default function NetworkRoot() {
   const { networkId } = useParams();
+  const navigate = useNavigate();
   const path = particlePath(networkId!, []);
   const viewMode = useViewModeStore((s) => s.viewMode);
   const setViewMode = useViewModeStore((s) => s.setViewMode);
 
+  const { streams } = useStreamParticles(path);
+  const [composeActive, setComposeActive] = useState(false);
+
+  const { selectedIndex } = useStreamKeyboardNav({
+    streams,
+    viewMode,
+    enabled: !composeActive,
+    onNavigate: useCallback(
+      (streamId: string) => navigate(`/${networkId}/${streamId}`),
+      [navigate, networkId],
+    ),
+  });
+
   return (
     <div className="relative min-h-0 flex-1">
       {/* Scrollable content */}
       <div className="h-full overflow-y-auto overscroll-contain pt-10 pb-14">
         {viewMode === "list" ? (
-          <ParticleListView path={path} />
+          <ParticleListView path={path} selectedIndex={selectedIndex} />
         ) : (
-          <ParticleGridView path={path} />
+          <ParticleGridView path={path} selectedIndex={selectedIndex} />
         )}
       </div>
 
@@ -51,7 +68,7 @@ export default function NetworkRoot() {
       </div>
 
       <AutoplayOverlay networkId={networkId!} />
-      <ComposeOverlay networkId={networkId!} />
+      <ComposeOverlay networkId={networkId!} onActiveChange={setComposeActive} />
       <div className="pointer-events-none absolute inset-x-0 bottom-0 flex justify-center p-3">
         <div className="pointer-events-auto">
           <ControlsIndicator type={"new"} />
diff --git a/js/src/features/particles/particle-grid-view.tsx b/js/src/features/particles/particle-grid-view.tsx
index 38e9a8a..5fb569b 100644
--- a/js/src/features/particles/particle-grid-view.tsx
+++ b/js/src/features/particles/particle-grid-view.tsx
@@ -7,9 +7,10 @@ import { StreamCard } from "@/features/particles/stream-card";
 
 interface ParticleGridViewProps {
   path: ParticlePath;
+  selectedIndex?: number | null;
 }
 
-export function ParticleGridView({ path }: ParticleGridViewProps) {
+export function ParticleGridView({ path, selectedIndex }: ParticleGridViewProps) {
   const { streams, isLoading, networkId } = useStreamParticles(path);
   const navigate = useNavigate();
 
@@ -30,13 +31,16 @@ export function ParticleGridView({ path }: ParticleGridViewProps) {
   }
 
   return (
-    <div className="grid grid-cols-2 gap-3 px-3">
-      {streams.map((stream) => (
+    <div className="grid grid-cols-3 gap-3 px-3">
+      {streams.map((stream, index) => (
         <StreamCard
           key={stream.id}
+          ref={index === selectedIndex ? (el) => el?.scrollIntoView({ block: "nearest" }) : undefined}
           particle={stream}
           networkId={networkId}
           onClick={() => navigate(`/${networkId}/${stream.id}`)}
+          isSelected={index === selectedIndex}
+          shortcutKey={index < 9 ? index + 1 : undefined}
         />
       ))}
     </div>
diff --git a/js/src/features/particles/particle-list-view.tsx b/js/src/features/particles/particle-list-view.tsx
index 86d7a60..8093e5b 100644
--- a/js/src/features/particles/particle-list-view.tsx
+++ b/js/src/features/particles/particle-list-view.tsx
@@ -77,10 +77,14 @@ function StreamRow({
   particle,
   networkId,
   onClick,
+  isSelected,
+  shortcutKey,
 }: {
   particle: Particle & { type: "stream"; properties: StreamProperties };
   networkId: string;
   onClick: () => void;
+  isSelected?: boolean;
+  shortcutKey?: number;
 }) {
   const streamPath = particlePath(networkId, [particle.id]);
   const { latestChild } = useLiveLatestChild(streamPath);
@@ -148,8 +152,16 @@ function StreamRow({
       tabIndex={0}
       onClick={onClick}
       onKeyDown={(e) => { if (e.key === "Enter" || e.key === " ") onClick(); }}
-      className="flex w-full items-center gap-3 px-4 py-3 text-left cursor-pointer transition-colors hover:bg-accent"
+      className={cn(
+        "flex w-full items-center gap-3 px-4 py-3 text-left cursor-pointer transition-colors hover:bg-accent",
+        isSelected && "bg-accent",
+      )}
     >
+      {shortcutKey && (
+        <kbd className="flex size-5 shrink-0 items-center justify-center rounded bg-white/10 font-mono text-xs text-muted-foreground">
+          {shortcutKey}
+        </kbd>
+      )}
       <Avatar
         className={cn(isUnseen && "ring-2 ring-primary")}
       >
@@ -211,12 +223,13 @@ function StreamRow({
 
 interface ParticleListViewProps {
   path: ParticlePath;
+  selectedIndex?: number | null;
 }
 
 /**
  * List of stream particles for a container (network root, folder, etc.).
  */
-export function ParticleListView({ path }: ParticleListViewProps) {
+export function ParticleListView({ path, selectedIndex }: ParticleListViewProps) {
   const { streams, isLoading, networkId } = useStreamParticles(path);
   const navigate = useNavigate();
 
@@ -238,13 +251,18 @@ export function ParticleListView({ path }: ParticleListViewProps) {
   return (
     <div>
       {streams.map((stream, index) => (
-        <div key={stream.id}>
+        <div
+          key={stream.id}
+          ref={index === selectedIndex ? (el) => el?.scrollIntoView({ block: "nearest" }) : undefined}
+        >
           <StreamRow
             particle={stream}
             networkId={networkId}
             onClick={() => navigate(`/${networkId}/${stream.id}`)}
+            isSelected={index === selectedIndex}
+            shortcutKey={index < 9 ? index + 1 : undefined}
           />
-          {index < streams.length - 1 && <Separator className="mx-4" />}
+          {index < streams.length - 1 && <Separator className="px-4" />}
         </div>
       ))}
     </div>
diff --git a/js/src/features/particles/particle-preview.tsx b/js/src/features/particles/particle-preview.tsx
index 733d8e5..7229c15 100644
--- a/js/src/features/particles/particle-preview.tsx
+++ b/js/src/features/particles/particle-preview.tsx
@@ -37,7 +37,7 @@ function TextPreview({ particle }: { particle: Extract<Particle, { type: "text"
       : particle.properties.content;
   return (
     <div className="flex h-full w-full items-center justify-center p-4">
-      <p className="line-clamp-4 text-center text-4xl leading-relaxed">
+      <p className="line-clamp-4 text-center text-xl leading-relaxed">
         {truncated}
       </p>
     </div>
@@ -100,7 +100,7 @@ function VideoThumbnail({
   }
 
   return (
-    <div className="relative h-full w-full bg-black">
+    <div className="relative h-full w-full bg-black blur-[2px]">
       <video
         src={`${url}#t=2`}
         preload="metadata"
diff --git a/js/src/features/particles/stream-card.tsx b/js/src/features/particles/stream-card.tsx
index fba623b..2f1a19d 100644
--- a/js/src/features/particles/stream-card.tsx
+++ b/js/src/features/particles/stream-card.tsx
@@ -1,4 +1,4 @@
-import { useMemo } from "react";
+import { forwardRef, useMemo } from "react";
 import { cn, getInitials } from "@/lib/utils";
 import { useLiveLatestChild } from "@/hooks/use-particle";
 import { useAuthStore } from "@/stores/auth-store";
@@ -15,9 +15,11 @@ interface StreamCardProps {
   particle: Particle & { type: "stream"; properties: StreamProperties };
   networkId: string;
   onClick: () => void;
+  isSelected?: boolean;
+  shortcutKey?: number;
 }
 
-export function StreamCard({ particle, networkId, onClick }: StreamCardProps) {
+export const StreamCard = forwardRef<HTMLDivElement, StreamCardProps>(function StreamCard({ particle, networkId, onClick, isSelected, shortcutKey }, ref) {
   const streamPath = particlePath(networkId, [particle.id]);
   const { latestChild } = useLiveLatestChild(streamPath);
   const userId = useAuthStore((s) => s.user?.id) ?? "";
@@ -74,6 +76,7 @@ export function StreamCard({ particle, networkId, onClick }: StreamCardProps) {
 
   return (
     <div
+      ref={ref}
       role="button"
       tabIndex={0}
       onClick={onClick}
@@ -83,10 +86,16 @@ export function StreamCard({ particle, networkId, onClick }: StreamCardProps) {
       className={cn(
         "cursor-pointer overflow-hidden rounded-xl ring-1 ring-foreground/10 transition-all hover:ring-foreground/20",
         isUnseen && "ring-2 ring-primary",
+        isSelected && "ring-2 ring-ring",
       )}
     >
       {/* Preview area */}
       <div className="relative aspect-[4/3] overflow-hidden bg-muted">
+        {shortcutKey && (
+          <kbd className="absolute top-1.5 left-1.5 z-10 flex size-5 items-center justify-center rounded bg-black/50 font-mono text-xs text-white/70">
+            {shortcutKey}
+          </kbd>
+        )}
         {latestChild ? (
           <ParticlePreview particle={latestChild} />
         ) : (
@@ -142,4 +151,4 @@ export function StreamCard({ particle, networkId, onClick }: StreamCardProps) {
       </div>
     </div>
   );
-}
+});
diff --git a/js/src/hooks/use-stream-keyboard-nav.ts b/js/src/hooks/use-stream-keyboard-nav.ts
new file mode 100644
index 0000000..8b615b4
--- /dev/null
+++ b/js/src/hooks/use-stream-keyboard-nav.ts
@@ -0,0 +1,93 @@
+import { useEffect, useState } from "react";
+
+interface UseStreamKeyboardNavOptions {
+  streams: Array<{ id: string }>;
+  viewMode: "list" | "grid";
+  enabled: boolean;
+  onNavigate: (streamId: string) => void;
+  gridColumns?: number;
+}
+
+export function useStreamKeyboardNav({
+  streams,
+  viewMode,
+  enabled,
+  onNavigate,
+  gridColumns = 3,
+}: UseStreamKeyboardNavOptions) {
+  const [selectedIndex, setSelectedIndex] = useState<number | null>(null);
+
+  // Reset selection to first item when streams change or view mode switches
+  useEffect(() => {
+    setSelectedIndex(streams.length > 0 ? 0 : null);
+  }, [streams.length, viewMode]);
+
+  useEffect(() => {
+    if (!enabled || streams.length === 0) return;
+
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.defaultPrevented) return;
+
+      const target = e.target as HTMLElement;
+      if (
+        target.tagName === "INPUT" ||
+        target.tagName === "TEXTAREA" ||
+        target.isContentEditable
+      ) {
+        return;
+      }
+
+      // Number keys 1-9: immediate navigation
+      const digit = parseInt(e.key, 10);
+      if (digit >= 1 && digit <= 9) {
+        const index = digit - 1;
+        if (index < streams.length) {
+          e.preventDefault();
+          onNavigate(streams[index].id);
+        }
+        return;
+      }
+
+      // Enter: navigate to selected
+      if (e.key === "Enter") {
+        setSelectedIndex((idx) => {
+          if (idx !== null && idx < streams.length) {
+            e.preventDefault();
+            onNavigate(streams[idx].id);
+          }
+          return idx;
+        });
+        return;
+      }
+
+      // Arrow keys: move selection
+      let delta: number | null = null;
+
+      if (viewMode === "list") {
+        if (e.key === "ArrowDown") delta = 1;
+        else if (e.key === "ArrowUp") delta = -1;
+      } else {
+        if (e.key === "ArrowDown") delta = gridColumns;
+        else if (e.key === "ArrowUp") delta = -gridColumns;
+        else if (e.key === "ArrowRight") delta = 1;
+        else if (e.key === "ArrowLeft") delta = -1;
+      }
+
+      if (delta !== null) {
+        e.preventDefault();
+        setSelectedIndex((prev) => {
+          if (prev === null) return 0;
+          const next = prev + delta;
+          return Math.max(0, Math.min(next, streams.length - 1));
+        });
+      }
+    };
+
+    // Use capture phase so arrow keys are intercepted before Radix UI
+    // components (ToggleGroup, etc.) consume them for their own navigation.
+    window.addEventListener("keydown", handleKeyDown, true);
+    return () => window.removeEventListener("keydown", handleKeyDown, true);
+  }, [enabled, viewMode, gridColumns, streams, onNavigate]);
+
+  return { selectedIndex };
+}