diff --git a/packages/react/src/components/chat/CopilotChatInput.tsx b/packages/react/src/components/chat/CopilotChatInput.tsx
index a80d8d02..56b6d79a 100644
--- a/packages/react/src/components/chat/CopilotChatInput.tsx
+++ b/packages/react/src/components/chat/CopilotChatInput.tsx
@@ -121,6 +121,8 @@ export function CopilotChatInput({
   const resolvedValue = isControlled ? (value ?? "") : internalValue;
 
   const [layout, setLayout] = useState<"compact" | "expanded">("compact");
+  const ignoreResizeRef = useRef(false);
+  const resizeEvaluationRafRef = useRef<number | null>(null);
   const isExpanded = mode === "input" && layout === "expanded";
   const [commandQuery, setCommandQuery] = useState<string | null>(null);
   const [slashHighlightIndex, setSlashHighlightIndex] = useState(0);
@@ -543,12 +545,32 @@ export function CopilotChatInput({
     return scrollHeight;
   }, [ensureMeasurements]);
 
+  const updateLayout = useCallback((nextLayout: "compact" | "expanded") => {
+    setLayout((prev) => {
+      if (prev === nextLayout) {
+        return prev;
+      }
+      ignoreResizeRef.current = true;
+      return nextLayout;
+    });
+  }, []);
+
   const evaluateLayout = useCallback(() => {
     if (mode !== "input") {
-      setLayout("compact");
+      updateLayout("compact");
       return;
     }
 
+    if (typeof window !== "undefined" && typeof window.matchMedia === "function") {
+      const isMobileViewport = window.matchMedia("(max-width: 767px)").matches;
+      if (isMobileViewport) {
+        ensureMeasurements();
+        adjustTextareaHeight();
+        updateLayout("expanded");
+        return;
+      }
+    }
+
     const textarea = inputRef.current;
     const grid = gridRef.current;
     const addContainer = addButtonContainerRef.current;
@@ -617,10 +639,8 @@ export function CopilotChatInput({
     }
 
     const nextLayout = shouldExpand ? "expanded" : "compact";
-    if (nextLayout !== layout) {
-      setLayout(nextLayout);
-    }
-  }, [adjustTextareaHeight, ensureMeasurements, layout, mode, resolvedValue]);
+    updateLayout(nextLayout);
+  }, [adjustTextareaHeight, ensureMeasurements, mode, resolvedValue, updateLayout]);
 
   useLayoutEffect(() => {
     evaluateLayout();
@@ -640,8 +660,29 @@ export function CopilotChatInput({
       return;
     }
 
+    const scheduleEvaluation = () => {
+      if (ignoreResizeRef.current) {
+        ignoreResizeRef.current = false;
+        return;
+      }
+
+      if (typeof window === "undefined") {
+        evaluateLayout();
+        return;
+      }
+
+      if (resizeEvaluationRafRef.current !== null) {
+        cancelAnimationFrame(resizeEvaluationRafRef.current);
+      }
+
+      resizeEvaluationRafRef.current = window.requestAnimationFrame(() => {
+        resizeEvaluationRafRef.current = null;
+        evaluateLayout();
+      });
+    };
+
     const observer = new ResizeObserver(() => {
-      evaluateLayout();
+      scheduleEvaluation();
     });
 
     observer.observe(grid);
@@ -649,7 +690,13 @@ export function CopilotChatInput({
     observer.observe(actionsContainer);
     observer.observe(textarea);
 
-    return () => observer.disconnect();
+    return () => {
+      observer.disconnect();
+      if (typeof window !== "undefined" && resizeEvaluationRafRef.current !== null) {
+        cancelAnimationFrame(resizeEvaluationRafRef.current);
+        resizeEvaluationRafRef.current = null;
+      }
+    };
   }, [evaluateLayout]);
 
   const slashMenuVisible = commandQuery !== null && commandItems.length > 0;
@@ -972,6 +1019,22 @@ export namespace CopilotChatInput {
 
     useImperativeHandle(ref, () => internalTextareaRef.current as HTMLTextAreaElement);
 
+    // Auto-scroll input into view on mobile when focused
+    useEffect(() => {
+      const textarea = internalTextareaRef.current;
+      if (!textarea) return;
+
+      const handleFocus = () => {
+        // Small delay to let the keyboard start appearing
+        setTimeout(() => {
+          textarea.scrollIntoView({ behavior: "smooth", block: "nearest" });
+        }, 300);
+      };
+
+      textarea.addEventListener("focus", handleFocus);
+      return () => textarea.removeEventListener("focus", handleFocus);
+    }, []);
+
     useEffect(() => {
       if (autoFocus) {
         internalTextareaRef.current?.focus();
diff --git a/packages/react/src/components/chat/CopilotChatSuggestionPill.tsx b/packages/react/src/components/chat/CopilotChatSuggestionPill.tsx
index 81b1503b..af4a69d0 100644
--- a/packages/react/src/components/chat/CopilotChatSuggestionPill.tsx
+++ b/packages/react/src/components/chat/CopilotChatSuggestionPill.tsx
@@ -11,7 +11,7 @@ export interface CopilotChatSuggestionPillProps
 }
 
 const baseClasses =
-  "group inline-flex h-8 items-center gap-1.5 rounded-full border border-border/60 bg-background px-3 text-xs leading-none text-foreground transition-colors cursor-pointer hover:bg-accent/60 hover:text-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background disabled:cursor-not-allowed disabled:text-muted-foreground disabled:hover:bg-background disabled:hover:text-muted-foreground pointer-events-auto";
+  "group inline-flex h-7 sm:h-8 items-center gap-1 sm:gap-1.5 rounded-full border border-border/60 bg-background px-2.5 sm:px-3 text-[11px] sm:text-xs leading-none text-foreground transition-colors cursor-pointer hover:bg-accent/60 hover:text-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background disabled:cursor-not-allowed disabled:text-muted-foreground disabled:hover:bg-background disabled:hover:text-muted-foreground pointer-events-auto";
 
 const labelClasses = "whitespace-nowrap font-medium leading-none";
 
@@ -35,12 +35,12 @@ export const CopilotChatSuggestionPill = React.forwardRef<
       {...props}
     >
       {isLoading ? (
-        <span className="flex h-4 w-4 items-center justify-center text-muted-foreground">
-          <Loader2 className="h-4 w-4 animate-spin" aria-hidden="true" />
+        <span className="flex h-3.5 sm:h-4 w-3.5 sm:w-4 items-center justify-center text-muted-foreground">
+          <Loader2 className="h-3.5 sm:h-4 w-3.5 sm:w-4 animate-spin" aria-hidden="true" />
         </span>
       ) : (
         showIcon && (
-          <span className="flex h-4 w-4 items-center justify-center text-muted-foreground">{icon}</span>
+          <span className="flex h-3.5 sm:h-4 w-3.5 sm:w-4 items-center justify-center text-muted-foreground">{icon}</span>
         )
       )}
       <span className={labelClasses}>{children}</span>
diff --git a/packages/react/src/components/chat/CopilotChatSuggestionView.tsx b/packages/react/src/components/chat/CopilotChatSuggestionView.tsx
index 722a3d51..affba917 100644
--- a/packages/react/src/components/chat/CopilotChatSuggestionView.tsx
+++ b/packages/react/src/components/chat/CopilotChatSuggestionView.tsx
@@ -14,7 +14,7 @@ const DefaultContainer = React.forwardRef<
     <div
       ref={ref}
       className={cn(
-        "flex flex-wrap items-center gap-2 px-4 sm:px-0 pointer-events-none",
+        "flex flex-wrap items-center gap-1.5 sm:gap-2 pl-0 pr-4 sm:px-0 pointer-events-none",
         className,
       )}
       {...props}
diff --git a/packages/react/src/components/chat/CopilotChatView.tsx b/packages/react/src/components/chat/CopilotChatView.tsx
index 55508bfc..fc9c76b0 100644
--- a/packages/react/src/components/chat/CopilotChatView.tsx
+++ b/packages/react/src/components/chat/CopilotChatView.tsx
@@ -11,6 +11,7 @@ import { ChevronDown } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { cn } from "@/lib/utils";
 import { useCopilotChatConfiguration, CopilotChatDefaultLabels } from "@/providers/CopilotChatConfigurationProvider";
+import { useKeyboardHeight } from "@/hooks/use-keyboard-height";
 
 export type CopilotChatViewProps = WithSlots<
   {
@@ -59,6 +60,9 @@ export function CopilotChatView({
   const [isResizing, setIsResizing] = useState(false);
   const resizeTimeoutRef = useRef<NodeJS.Timeout | null>(null);
 
+  // Track keyboard state for mobile
+  const { isKeyboardOpen, keyboardHeight, availableHeight } = useKeyboardHeight();
+
   // Track input container height changes
   useEffect(() => {
     const element = inputContainerRef.current;
@@ -132,7 +136,7 @@ export function CopilotChatView({
       <div style={{ paddingBottom: `${inputContainerHeight + (hasSuggestions ? 4 : 32)}px` }}>
         <div className="max-w-3xl mx-auto">
           {BoundMessageView}
-          {hasSuggestions ? <div className="px-4 sm:px-0 mt-4">{BoundSuggestionView}</div> : null}
+          {hasSuggestions ? <div className="pl-0 pr-4 sm:px-0 mt-4">{BoundSuggestionView}</div> : null}
         </div>
       </div>
     ),
@@ -144,6 +148,7 @@ export function CopilotChatView({
 
   const BoundInputContainer = renderSlot(inputContainer, CopilotChatView.InputContainer, {
     ref: inputContainerRef,
+    keyboardHeight: isKeyboardOpen ? keyboardHeight : 0,
     children: (
       <>
         <div className="max-w-3xl mx-auto py-0 px-4 sm:px-0 [div[data-sidebar-chat]_&]:px-8 [div[data-popup-chat]_&]:px-6 pointer-events-auto">
@@ -354,9 +359,18 @@ export namespace CopilotChatView {
 
   export const InputContainer = React.forwardRef<
     HTMLDivElement,
-    React.HTMLAttributes<HTMLDivElement> & { children: React.ReactNode }
-  >(({ children, className, ...props }, ref) => (
-    <div ref={ref} className={cn("absolute bottom-0 left-0 right-0 z-20 pointer-events-none", className)} {...props}>
+    React.HTMLAttributes<HTMLDivElement> & { children: React.ReactNode; keyboardHeight?: number }
+  >(({ children, className, keyboardHeight = 0, ...props }, ref) => (
+    <div
+      ref={ref}
+      className={cn("absolute bottom-0 left-0 right-0 z-20 pointer-events-none", className)}
+      style={{
+        // Adjust position when keyboard is open to keep input visible
+        transform: keyboardHeight > 0 ? `translateY(-${keyboardHeight}px)` : undefined,
+        transition: "transform 0.2s ease-out",
+      }}
+      {...props}
+    >
       {children}
     </div>
   ));
diff --git a/packages/react/src/components/chat/CopilotPopupView.tsx b/packages/react/src/components/chat/CopilotPopupView.tsx
index aee66817..a4f130de 100644
--- a/packages/react/src/components/chat/CopilotPopupView.tsx
+++ b/packages/react/src/components/chat/CopilotPopupView.tsx
@@ -137,8 +137,33 @@ export function CopilotPopupView({
   const resolvedWidth = dimensionToCss(width, DEFAULT_POPUP_WIDTH);
   const resolvedHeight = dimensionToCss(height, DEFAULT_POPUP_HEIGHT);
 
+  const popupStyle = useMemo(
+    () =>
+      ({
+        "--copilot-popup-width": resolvedWidth,
+        "--copilot-popup-height": resolvedHeight,
+        "--copilot-popup-max-width": "calc(100vw - 3rem)",
+        "--copilot-popup-max-height": "calc(100dvh - 7.5rem)",
+        paddingTop: "env(safe-area-inset-top)",
+        paddingBottom: "env(safe-area-inset-bottom)",
+        paddingLeft: "env(safe-area-inset-left)",
+        paddingRight: "env(safe-area-inset-right)",
+      }) as React.CSSProperties,
+    [resolvedHeight, resolvedWidth],
+  );
+
+  const popupAnimationClass =
+    isPopupOpen && !isAnimatingOut
+      ? "pointer-events-auto translate-y-0 opacity-100 md:scale-100"
+      : "pointer-events-none translate-y-4 opacity-0 md:translate-y-5 md:scale-[0.95]";
+
   const popupContent = isRendered ? (
-    <div className="fixed bottom-24 right-6 z-[1200] flex max-w-full flex-col items-end gap-4">
+    <div
+      className={cn(
+        "fixed inset-0 z-[1200] flex max-w-full flex-col items-stretch",
+        "md:inset-auto md:bottom-24 md:right-6 md:items-end md:gap-4",
+      )}
+    >
       <div
         ref={containerRef}
         tabIndex={-1}
@@ -146,24 +171,23 @@ export function CopilotPopupView({
         aria-label={labels.modalHeaderTitle}
         data-copilot-popup
         className={cn(
-          "relative flex max-w-lg flex-col overflow-hidden rounded-2xl border border-border",
-          "bg-background text-foreground shadow-xl ring-1 ring-border/40",
-          "focus:outline-none transition-all duration-200 ease-out",
-          isPopupOpen && !isAnimatingOut
-            ? "pointer-events-auto translate-y-0 scale-100 opacity-100"
-            : "pointer-events-none translate-y-5 scale-[0.95] opacity-0",
+          "relative flex h-full w-full flex-col overflow-hidden bg-background text-foreground",
+          "origin-bottom focus:outline-none transform-gpu transition-transform transition-opacity duration-200 ease-out",
+          "md:transition-transform md:transition-opacity",
+          "rounded-none border border-border/0 shadow-none ring-0",
+          "md:h-[var(--copilot-popup-height)] md:w-[var(--copilot-popup-width)]",
+          "md:max-h-[var(--copilot-popup-max-height)] md:max-w-[var(--copilot-popup-max-width)]",
+          "md:origin-bottom-right md:rounded-2xl md:border-border md:shadow-xl md:ring-1 md:ring-border/40",
+          popupAnimationClass,
         )}
-        style={{
-          width: resolvedWidth,
-          maxWidth: "calc(100vw - 3rem)",
-          height: resolvedHeight,
-          maxHeight: "calc(100dvh - 7.5rem)",
-          transformOrigin: "bottom right",
-        }}
+        style={popupStyle}
       >
         {headerElement}
         <div className="flex-1 overflow-hidden" data-popup-chat>
-          <CopilotChatView {...restProps} className={cn("h-full", className)} />
+          <CopilotChatView
+            {...restProps}
+            className={cn("h-full min-h-0", className)}
+          />
         </div>
       </div>
     </div>
diff --git a/packages/react/src/components/chat/CopilotSidebarView.tsx b/packages/react/src/components/chat/CopilotSidebarView.tsx
index acee22e2..5a942144 100644
--- a/packages/react/src/components/chat/CopilotSidebarView.tsx
+++ b/packages/react/src/components/chat/CopilotSidebarView.tsx
@@ -78,10 +78,13 @@ export function CopilotSidebarView({ header, width, ...props }: CopilotSidebarVi
       {isSidebarOpen && (
         <style
           dangerouslySetInnerHTML={{
-            __html: `body {
-            margin-inline-end: ${widthToMargin(sidebarWidth)};
-            transition: margin-inline-end ${SIDEBAR_TRANSITION_MS}ms ease;
-          }`,
+            __html: `
+            @media (min-width: 768px) {
+              body {
+                margin-inline-end: ${widthToMargin(sidebarWidth)};
+                transition: margin-inline-end ${SIDEBAR_TRANSITION_MS}ms ease;
+              }
+            }`,
           }}
         />
       )}
@@ -90,12 +93,22 @@ export function CopilotSidebarView({ header, width, ...props }: CopilotSidebarVi
         ref={sidebarRef}
         data-copilot-sidebar
         className={cn(
-          "fixed right-0 top-0 z-[1200] flex h-dvh max-h-screen",
+          "fixed right-0 top-0 z-[1200] flex",
+          // Height with dvh fallback and safe area support
+          "h-[100vh] h-[100dvh] max-h-screen",
+          // Responsive width: full on mobile, custom on desktop
+          "w-full",
           "border-l border-border bg-background text-foreground shadow-xl",
           "transition-transform duration-300 ease-out",
           isSidebarOpen ? "translate-x-0" : "translate-x-full pointer-events-none",
         )}
-        style={{ width: widthToCss(sidebarWidth) }}
+        style={{
+          // Use CSS custom property for responsive width
+          ["--sidebar-width" as string]: widthToCss(sidebarWidth),
+          // Safe area insets for iOS
+          paddingTop: "env(safe-area-inset-top)",
+          paddingBottom: "env(safe-area-inset-bottom)",
+        } as React.CSSProperties}
         aria-hidden={!isSidebarOpen}
         aria-label="Copilot chat sidebar"
         role="complementary"
diff --git a/packages/react/src/hooks/use-keyboard-height.tsx b/packages/react/src/hooks/use-keyboard-height.tsx
new file mode 100644
index 00000000..22d0062c
--- /dev/null
+++ b/packages/react/src/hooks/use-keyboard-height.tsx
@@ -0,0 +1,67 @@
+import { useState, useEffect } from "react";
+
+export interface KeyboardState {
+  isKeyboardOpen: boolean;
+  keyboardHeight: number;
+  availableHeight: number;
+  viewportHeight: number;
+}
+
+/**
+ * Hook to detect mobile keyboard appearance and calculate available viewport height.
+ * Uses the Visual Viewport API to track keyboard state on mobile devices.
+ *
+ * @returns KeyboardState object with keyboard information
+ */
+export function useKeyboardHeight(): KeyboardState {
+  const [keyboardState, setKeyboardState] = useState<KeyboardState>({
+    isKeyboardOpen: false,
+    keyboardHeight: 0,
+    availableHeight: typeof window !== "undefined" ? window.innerHeight : 0,
+    viewportHeight: typeof window !== "undefined" ? window.innerHeight : 0,
+  });
+
+  useEffect(() => {
+    if (typeof window === "undefined") {
+      return;
+    }
+
+    // Check if Visual Viewport API is available
+    const visualViewport = window.visualViewport;
+    if (!visualViewport) {
+      return;
+    }
+
+    const updateKeyboardState = () => {
+      const layoutHeight = window.innerHeight;
+      const visualHeight = visualViewport.height;
+
+      // Calculate keyboard height (difference between layout and visual viewport)
+      const keyboardHeight = Math.max(0, layoutHeight - visualHeight);
+
+      // Keyboard is considered open if the height difference is significant (> 150px)
+      const isKeyboardOpen = keyboardHeight > 150;
+
+      setKeyboardState({
+        isKeyboardOpen,
+        keyboardHeight,
+        availableHeight: visualHeight,
+        viewportHeight: layoutHeight,
+      });
+    };
+
+    // Initial state
+    updateKeyboardState();
+
+    // Listen for viewport changes
+    visualViewport.addEventListener("resize", updateKeyboardState);
+    visualViewport.addEventListener("scroll", updateKeyboardState);
+
+    return () => {
+      visualViewport.removeEventListener("resize", updateKeyboardState);
+      visualViewport.removeEventListener("scroll", updateKeyboardState);
+    };
+  }, []);
+
+  return keyboardState;
+}
diff --git a/packages/react/src/styles/globals.css b/packages/react/src/styles/globals.css
index 66c604e9..f1a910a3 100644
--- a/packages/react/src/styles/globals.css
+++ b/packages/react/src/styles/globals.css
@@ -141,6 +141,37 @@
   body {
     @apply bg-background text-foreground;
   }
+
+  /* Mobile viewport support */
+  @supports (height: 100dvh) {
+    [data-copilot-sidebar] {
+      height: 100dvh;
+    }
+  }
+
+  /* Responsive sidebar width */
+  @media (min-width: 768px) {
+    [data-copilot-sidebar] {
+      width: var(--sidebar-width, 480px) !important;
+    }
+  }
+
+  /* Mobile optimizations */
+  @media (max-width: 767px) {
+    [data-copilot-sidebar] {
+      width: 100% !important;
+    }
+
+    /* Improve touch scrolling on iOS */
+    [data-copilot-sidebar] {
+      -webkit-overflow-scrolling: touch;
+    }
+
+    /* Better scrolling performance */
+    [data-sidebar-chat] {
+      touch-action: pan-y;
+    }
+  }
 }
 
 div[data-streamdown="code-block"] > pre {
diff --git a/packages/web-inspector/src/index.ts b/packages/web-inspector/src/index.ts
index 0010e30b..6cc4ae84 100644
--- a/packages/web-inspector/src/index.ts
+++ b/packages/web-inspector/src/index.ts
@@ -114,13 +114,13 @@ export class WebInspectorElement extends LitElement {
     button: {
       position: { x: EDGE_MARGIN, y: EDGE_MARGIN },
       size: { ...DEFAULT_BUTTON_SIZE },
-      anchor: { horizontal: "right", vertical: "bottom" },
+      anchor: { horizontal: "right", vertical: "top" },
       anchorOffset: { x: EDGE_MARGIN, y: EDGE_MARGIN },
     },
     window: {
       position: { x: EDGE_MARGIN, y: EDGE_MARGIN },
       size: { ...DEFAULT_WINDOW_SIZE },
-      anchor: { horizontal: "right", vertical: "bottom" },
+      anchor: { horizontal: "right", vertical: "top" },
       anchorOffset: { x: EDGE_MARGIN, y: EDGE_MARGIN },
     },
   };
@@ -727,10 +727,10 @@ export class WebInspectorElement extends LitElement {
     this.measureContext("button");
     this.measureContext("window");
 
-    this.contextState.button.anchor = { horizontal: "right", vertical: "bottom" };
+    this.contextState.button.anchor = { horizontal: "right", vertical: "top" };
     this.contextState.button.anchorOffset = { x: EDGE_MARGIN, y: EDGE_MARGIN };
 
-    this.contextState.window.anchor = { horizontal: "right", vertical: "bottom" };
+    this.contextState.window.anchor = { horizontal: "right", vertical: "top" };
     this.contextState.window.anchorOffset = { x: EDGE_MARGIN, y: EDGE_MARGIN };
 
     this.hydrateStateFromCookie();