fix: clean up chat UI layout and align theme to neutral white

- Replace beige background with clean neutral white (matches Grok aesthetic)
- Remove hardcoded hex colors in thread.tsx - use CSS variables throughout
- Remove scroll-to-bottom button that showed incorrectly after auto-send
- Chat container now integrates visually with the page instead of floating

Made-with: Cursor

app/globals.css

@@ -44,44 +44,38 @@
 }
 
 :root {
-  --radius: 0.625rem;
+  --radius: 0.5rem;
-  /* Vib'n warm beige background from logo */
+  --background: oklch(0.985 0 0);
-  --background: oklch(0.96 0.015 80);
+  --foreground: oklch(0.09 0 0);
-  --foreground: oklch(0.25 0.02 230);
+  --card: oklch(1 0 0);
-  /* Slightly warmer white for cards */
+  --card-foreground: oklch(0.09 0 0);
-  --card: oklch(0.99 0.01 80);
+  --popover: oklch(1 0 0);
-  --card-foreground: oklch(0.25 0.02 230);
+  --popover-foreground: oklch(0.09 0 0);
-  --popover: oklch(0.99 0.01 80);
+  --primary: oklch(0.09 0 0);
-  --popover-foreground: oklch(0.25 0.02 230);
+  --primary-foreground: oklch(0.985 0 0);
-  /* Vib'n dark blue from logo text */
+  --secondary: oklch(0.94 0 0);
-  --primary: oklch(0.35 0.08 230);
+  --secondary-foreground: oklch(0.09 0 0);
-  --primary-foreground: oklch(0.99 0 0);
+  --muted: oklch(0.94 0 0);
-  --secondary: oklch(0.92 0.015 80);
+  --muted-foreground: oklch(0.50 0 0);
-  --secondary-foreground: oklch(0.35 0.08 230);
+  --accent: oklch(0.94 0 0);
-  --muted: oklch(0.92 0.015 80);
+  --accent-foreground: oklch(0.09 0 0);
-  --muted-foreground: oklch(0.50 0.02 230);
-  --accent: oklch(0.92 0.015 80);
-  --accent-foreground: oklch(0.35 0.08 230);
   --destructive: oklch(0.577 0.245 27.325);
-  /* Softer borders on warm background */
+  --border: oklch(0.88 0 0);
-  --border: oklch(0.88 0.015 80);
+  --input: oklch(0.88 0 0);
-  --input: oklch(0.88 0.015 80);
+  --ring: oklch(0.70 0 0);
-  --ring: oklch(0.60 0.08 230);
+  --chart-1: oklch(0.70 0.15 60);
-  /* Vib'n brand colors for charts */
+  --chart-2: oklch(0.70 0.12 210);
-  --chart-1: oklch(0.70 0.15 60); /* Orange */
+  --chart-3: oklch(0.55 0.10 220);
-  --chart-2: oklch(0.70 0.12 210); /* Light blue */
+  --chart-4: oklch(0.40 0.08 230);
-  --chart-3: oklch(0.55 0.10 220); /* Medium blue */
+  --chart-5: oklch(0.75 0.15 70);
-  --chart-4: oklch(0.40 0.08 230); /* Dark blue */
+  --sidebar: oklch(0.985 0 0);
-  --chart-5: oklch(0.75 0.15 70); /* Yellow */
+  --sidebar-foreground: oklch(0.09 0 0);
-  /* Sidebar with warm tint */
+  --sidebar-primary: oklch(0.09 0 0);
-  --sidebar: oklch(0.98 0.01 80);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
-  --sidebar-foreground: oklch(0.30 0.02 230);
+  --sidebar-accent: oklch(0.94 0 0);
-  --sidebar-primary: oklch(0.35 0.08 230);
+  --sidebar-accent-foreground: oklch(0.09 0 0);
-  --sidebar-primary-foreground: oklch(0.99 0 0);
+  --sidebar-border: oklch(0.88 0 0);
-  --sidebar-accent: oklch(0.92 0.015 80);
+  --sidebar-ring: oklch(0.70 0 0);
-  --sidebar-accent-foreground: oklch(0.35 0.08 230);
-  --sidebar-border: oklch(0.88 0.015 80);
-  --sidebar-ring: oklch(0.60 0.08 230);
 }
 
 .dark {

components/AtlasChat.tsx

@@ -91,14 +91,14 @@ function AtlasChatInner({
   };
 
   return (
-    <div className="flex flex-col rounded-2xl overflow-hidden bg-[#fdfdfd] dark:bg-[#141414] ring-1 ring-[#e5e5e5] dark:ring-[#2a2a2a]" style={{ height: "600px" }}>
+    <div className="flex flex-col rounded-2xl overflow-hidden bg-card ring-1 ring-border" style={{ height: "600px" }}>
       {/* Minimal header bar */}
-      <div className="flex items-center justify-end px-4 py-2.5 shrink-0 border-b border-[#e5e5e5] dark:border-[#2a2a2a]">
+      <div className="flex items-center justify-end px-4 py-2.5 shrink-0 border-b border-border">
         <Button
           variant="ghost"
           size="sm"
           onClick={handleReset}
-          className="h-7 w-7 p-0 text-[#9a9a9a] dark:text-[#6b6b6b] hover:text-[#0d0d0d] dark:hover:text-white"
+          className="h-7 w-7 p-0 text-muted-foreground hover:text-foreground"
           title="Start over"
         >
           <RotateCcw className="w-3.5 h-3.5" />

components/assistant-ui/thread.tsx

@@ -8,7 +8,6 @@ import {
   ThreadPrimitive,
 } from "@assistant-ui/react";
 import {
-  ArrowDownIcon,
   ArrowUpIcon,
   CheckIcon,
   ChevronLeftIcon,
@@ -26,7 +25,7 @@ import { MarkdownText } from "./markdown-text";
 // ---------------------------------------------------------------------------
 
 export const Thread: FC = () => (
-  <ThreadPrimitive.Root className="flex flex-col h-full bg-[#fdfdfd] dark:bg-[#141414] px-4">
+  <ThreadPrimitive.Root className="flex flex-col h-full px-4">
 
     {/* Empty state: centered welcome + composer */}
     <ThreadPrimitive.Empty>
@@ -35,8 +34,8 @@ export const Thread: FC = () => (
           <div className="w-10 h-10 rounded-full bg-gradient-to-br from-violet-500 to-indigo-600 flex items-center justify-center text-white font-bold text-base shadow-sm">
             A
           </div>
-          <p className="text-sm font-medium text-[#0d0d0d] dark:text-white">Atlas</p>
+          <p className="text-sm font-medium text-foreground">Atlas</p>
-          <p className="text-xs text-[#9a9a9a] dark:text-[#6b6b6b] max-w-xs">
+          <p className="text-xs text-muted-foreground max-w-xs">
             Your product strategist. Let&apos;s define what you&apos;re building.
           </p>
         </div>
@@ -56,51 +55,33 @@ export const Thread: FC = () => (
       />
     </ThreadPrimitive.Viewport>
 
-    {/* Scroll to bottom */}
+    <Composer />
-    <div className="relative">
-      <ThreadScrollToBottom />
-      <Composer />
-    </div>
   </ThreadPrimitive.Root>
 );
 
-// ---------------------------------------------------------------------------
-// Scroll to bottom
-// ---------------------------------------------------------------------------
-
-const ThreadScrollToBottom: FC = () => (
-  <ThreadPrimitive.ScrollToBottom asChild>
-    <button className="absolute -top-10 right-4 flex h-8 w-8 items-center justify-center rounded-full bg-[#0d0d0d] dark:bg-white text-white dark:text-[#0d0d0d] shadow hover:opacity-80 transition-opacity">
-      <ArrowDownIcon className="h-3.5 w-3.5" />
-    </button>
-  </ThreadPrimitive.ScrollToBottom>
-);
-
 // ---------------------------------------------------------------------------
 // Composer — Grok pill style with inverted send button
 // ---------------------------------------------------------------------------
 
 const Composer: FC = () => (
   <ComposerPrimitive.Root className="group/composer mx-auto w-full max-w-2xl mb-3">
-    <div className="flex items-end gap-2 rounded-[26px] bg-[#f8f8f8] dark:bg-[#212121] ring-1 ring-[#e5e5e5] dark:ring-[#2a2a2a] px-4 py-3 transition-shadow focus-within:ring-[#c5c5c5] dark:focus-within:ring-[#3a3a3a]">
+    <div className="flex items-end gap-2 rounded-[26px] bg-muted ring-1 ring-border px-4 py-3 transition-shadow focus-within:ring-ring/50">
       <ComposerPrimitive.Input
         placeholder="What do you want to build?"
         rows={1}
         autoFocus
-        className="flex-1 resize-none bg-transparent text-[#0d0d0d] dark:text-white placeholder:text-[#9a9a9a] dark:placeholder:text-[#6b6b6b] text-sm leading-relaxed outline-none min-h-[24px] max-h-[120px]"
+        className="flex-1 resize-none bg-transparent text-foreground placeholder:text-muted-foreground text-sm leading-relaxed outline-none min-h-[24px] max-h-[120px]"
       />
-      {/* Send button (hidden while running) */}
       <ThreadPrimitive.If running={false}>
         <ComposerPrimitive.Send asChild>
-          <button className="h-8 w-8 rounded-full bg-[#0d0d0d] dark:bg-white text-white dark:text-[#0d0d0d] flex items-center justify-center shrink-0 hover:opacity-80 transition-opacity disabled:opacity-30 disabled:cursor-not-allowed">
+          <button className="h-8 w-8 rounded-full bg-foreground text-background flex items-center justify-center shrink-0 hover:opacity-80 transition-opacity disabled:opacity-30 disabled:cursor-not-allowed">
             <ArrowUpIcon className="h-3.5 w-3.5" />
           </button>
         </ComposerPrimitive.Send>
       </ThreadPrimitive.If>
-      {/* Cancel button (shown while running) */}
       <ThreadPrimitive.If running>
         <ComposerPrimitive.Cancel asChild>
-          <button className="h-8 w-8 rounded-full bg-[#0d0d0d] dark:bg-white text-white dark:text-[#0d0d0d] flex items-center justify-center shrink-0 hover:opacity-80 transition-opacity">
+          <button className="h-8 w-8 rounded-full bg-foreground text-background flex items-center justify-center shrink-0 hover:opacity-80 transition-opacity">
             <SquareIcon className="h-3 w-3 fill-current" />
           </button>
         </ComposerPrimitive.Cancel>
@@ -115,7 +96,7 @@ const Composer: FC = () => (
 
 const FollowupSuggestion: FC<{ suggestion: { prompt: string } }> = ({ suggestion }) => (
   <ThreadPrimitive.Suggestion prompt={suggestion.prompt} send asChild>
-    <button className="text-xs px-3 py-1.5 rounded-full ring-1 ring-[#e5e5e5] dark:ring-[#2a2a2a] text-[#9a9a9a] dark:text-[#6b6b6b] hover:ring-[#c5c5c5] dark:hover:ring-[#3a3a3a] hover:text-[#0d0d0d] dark:hover:text-white transition-all">
+    <button className="text-xs px-3 py-1.5 rounded-full ring-1 ring-border text-muted-foreground hover:ring-ring/50 hover:text-foreground transition-all">
       {suggestion.prompt}
     </button>
   </ThreadPrimitive.Suggestion>
@@ -135,7 +116,7 @@ const UserMessage: FC = () => (
 );
 
 const UserText: FC<{ text: string }> = ({ text }) => (
-  <div className="bg-[#0d0d0d] dark:bg-white text-white dark:text-[#0d0d0d] rounded-[20px] rounded-tr-[6px] px-4 py-2.5 text-sm leading-relaxed whitespace-pre-wrap">
+  <div className="bg-foreground text-background rounded-[20px] rounded-tr-[6px] px-4 py-2.5 text-sm leading-relaxed whitespace-pre-wrap">
     {text}
   </div>
 );
@@ -147,7 +128,7 @@ const UserActionBar: FC = () => (
     className="flex items-center gap-1 mt-1 justify-end opacity-0 group-hover:opacity-100 transition-opacity"
   >
     <ActionBarPrimitive.Edit asChild>
-      <button className="text-[10px] text-[#9a9a9a] dark:text-[#6b6b6b] hover:text-[#0d0d0d] dark:hover:text-white px-1.5 py-0.5 rounded transition-colors">
+      <button className="text-[10px] text-muted-foreground hover:text-foreground px-1.5 py-0.5 rounded transition-colors">
         Edit
       </button>
     </ActionBarPrimitive.Edit>
@@ -184,7 +165,7 @@ const AssistantActionBar: FC = () => (
     className="flex items-center gap-2 mt-1.5 opacity-0 group-hover:opacity-100 transition-opacity"
   >
     <ActionBarPrimitive.Copy asChild>
-      <button className="flex items-center gap-1 text-[10px] text-[#9a9a9a] dark:text-[#6b6b6b] hover:text-[#0d0d0d] dark:hover:text-white px-1.5 py-0.5 rounded transition-colors">
+      <button className="flex items-center gap-1 text-[10px] text-muted-foreground hover:text-foreground px-1.5 py-0.5 rounded transition-colors">
         <MessagePrimitive.If copied>
           <CheckIcon className="h-2.5 w-2.5" />
           Copied
@@ -196,7 +177,7 @@ const AssistantActionBar: FC = () => (
       </button>
     </ActionBarPrimitive.Copy>
     <ActionBarPrimitive.Reload asChild>
-      <button className="flex items-center gap-1 text-[10px] text-[#9a9a9a] dark:text-[#6b6b6b] hover:text-[#0d0d0d] dark:hover:text-white px-1.5 py-0.5 rounded transition-colors">
+      <button className="flex items-center gap-1 text-[10px] text-muted-foreground hover:text-foreground px-1.5 py-0.5 rounded transition-colors">
         <RefreshCwIcon className="h-2.5 w-2.5" />
         Retry
       </button>
@@ -214,15 +195,15 @@ const BranchPicker: FC = () => (
     className="flex items-center gap-1 mt-1 opacity-0 group-hover:opacity-100 transition-opacity"
   >
     <BranchPickerPrimitive.Previous asChild>
-      <button className="text-[#9a9a9a] dark:text-[#6b6b6b] hover:text-[#0d0d0d] dark:hover:text-white transition-colors">
+      <button className="text-muted-foreground hover:text-foreground transition-colors">
         <ChevronLeftIcon className="h-3 w-3" />
       </button>
     </BranchPickerPrimitive.Previous>
-    <span className="text-[10px] text-[#9a9a9a] dark:text-[#6b6b6b]">
+    <span className="text-[10px] text-muted-foreground">
       <BranchPickerPrimitive.Number /> / <BranchPickerPrimitive.Count />
     </span>
     <BranchPickerPrimitive.Next asChild>
-      <button className="text-[#9a9a9a] dark:text-[#6b6b6b] hover:text-[#0d0d0d] dark:hover:text-white transition-colors">
+      <button className="text-muted-foreground hover:text-foreground transition-colors">
         <ChevronRightIcon className="h-3 w-3" />
       </button>
     </BranchPickerPrimitive.Next>