diff --git a/packages/ui/src/components/Badge.tsx b/packages/ui/src/components/Badge.tsx
new file mode 100644
index 0000000..05baa96
--- /dev/null
+++ b/packages/ui/src/components/Badge.tsx
@@ -0,0 +1,27 @@
+import type { HTMLAttributes, ReactNode } from 'react';
+import { cn } from '../utils/cn.ts';
+
+interface BadgeProps extends HTMLAttributes<HTMLSpanElement> {
+  variant?: 'default' | 'accent' | 'danger' | 'warning' | 'success' | 'muted';
+  children: ReactNode;
+}
+
+export function Badge({ variant = 'default', className, children, ...props }: BadgeProps) {
+  return (
+    <span
+      className={cn(
+        'inline-flex items-center rounded-[5px] border px-1.5 py-px text-[8px] font-extrabold leading-none tracking-wide',
+        variant === 'default' && 'border-white/8 bg-wing-muted/22 text-white',
+        variant === 'accent' && 'border-wing-accent/70 bg-wing-accent/22 text-white',
+        variant === 'danger' && 'border-wing-danger/70 bg-wing-danger/22 text-white',
+        variant === 'warning' && 'border-wing-warning/70 bg-wing-warning/22 text-white',
+        variant === 'success' && 'border-wing-success/70 bg-wing-success/22 text-white',
+        variant === 'muted' && 'border-wing-border/90 bg-wing-card/55 text-wing-muted font-bold',
+        className,
+      )}
+      {...props}
+    >
+      {children}
+    </span>
+  );
+}
diff --git a/packages/ui/src/components/Button.tsx b/packages/ui/src/components/Button.tsx
new file mode 100644
index 0000000..4493aa9
--- /dev/null
+++ b/packages/ui/src/components/Button.tsx
@@ -0,0 +1,30 @@
+import type { ButtonHTMLAttributes, ReactNode } from 'react';
+import { cn } from '../utils/cn.ts';
+
+interface ButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  variant?: 'ghost' | 'primary' | 'danger';
+  size?: 'sm' | 'md';
+  children: ReactNode;
+}
+
+export function Button({ variant = 'ghost', size = 'sm', className, children, ...props }: ButtonProps) {
+  return (
+    <button
+      className={cn(
+        'cursor-pointer rounded border transition-all duration-150 select-none whitespace-nowrap',
+        size === 'sm' && 'px-1.5 py-0.5 text-[9px]',
+        size === 'md' && 'px-2.5 py-1.5 text-xs rounded-lg',
+        variant === 'ghost' &&
+          'border-wing-border bg-transparent text-wing-muted hover:text-wing-text hover:border-wing-accent',
+        variant === 'primary' &&
+          'border-wing-accent bg-wing-accent text-white hover:brightness-110',
+        variant === 'danger' &&
+          'border-wing-danger bg-transparent text-wing-danger hover:bg-wing-danger/10',
+        className,
+      )}
+      {...props}
+    >
+      {children}
+    </button>
+  );
+}
diff --git a/packages/ui/src/components/IconButton.tsx b/packages/ui/src/components/IconButton.tsx
new file mode 100644
index 0000000..585005c
--- /dev/null
+++ b/packages/ui/src/components/IconButton.tsx
@@ -0,0 +1,27 @@
+import type { ButtonHTMLAttributes, ReactNode } from 'react';
+import { cn } from '../utils/cn.ts';
+
+interface IconButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  active?: boolean;
+  size?: 'sm' | 'md';
+  children: ReactNode;
+}
+
+export function IconButton({ active, size = 'md', className, children, ...props }: IconButtonProps) {
+  return (
+    <button
+      className={cn(
+        'flex shrink-0 cursor-pointer items-center justify-center rounded border p-0 transition-all duration-150 select-none',
+        'border-wing-border bg-wing-glass text-wing-muted backdrop-blur-lg',
+        'hover:text-wing-text hover:border-wing-accent',
+        size === 'sm' && 'h-[22px] w-[22px] rounded text-sm',
+        size === 'md' && 'h-[29px] w-[29px] rounded text-base',
+        active && 'text-wing-accent border-wing-accent',
+        className,
+      )}
+      {...props}
+    >
+      {children}
+    </button>
+  );
+}
diff --git a/packages/ui/src/components/ListItem.tsx b/packages/ui/src/components/ListItem.tsx
new file mode 100644
index 0000000..852414b
--- /dev/null
+++ b/packages/ui/src/components/ListItem.tsx
@@ -0,0 +1,26 @@
+import type { HTMLAttributes, ReactNode } from 'react';
+import { cn } from '../utils/cn.ts';
+
+interface ListItemProps extends HTMLAttributes<HTMLDivElement> {
+  selected?: boolean;
+  highlighted?: boolean;
+  children: ReactNode;
+}
+
+export function ListItem({ selected, highlighted, className, children, ...props }: ListItemProps) {
+  return (
+    <div
+      className={cn(
+        'flex cursor-pointer items-center gap-1.5 rounded px-1.5 py-1 text-[10px] transition-colors duration-100 select-none',
+        'hover:bg-wing-card',
+        selected && 'bg-[rgba(14,234,255,0.16)] border-[rgba(14,234,255,0.55)]',
+        highlighted && !selected && 'bg-[rgba(245,158,11,0.16)] border border-[rgba(245,158,11,0.4)]',
+        selected && highlighted && 'bg-gradient-to-r from-[rgba(14,234,255,0.16)] to-[rgba(245,158,11,0.16)] border-[rgba(14,234,255,0.7)]',
+        className,
+      )}
+      {...props}
+    >
+      {children}
+    </div>
+  );
+}
diff --git a/packages/ui/src/components/Panel.tsx b/packages/ui/src/components/Panel.tsx
new file mode 100644
index 0000000..1fac0ae
--- /dev/null
+++ b/packages/ui/src/components/Panel.tsx
@@ -0,0 +1,24 @@
+import type { HTMLAttributes, ReactNode } from 'react';
+import { cn } from '../utils/cn.ts';
+
+interface PanelProps extends HTMLAttributes<HTMLDivElement> {
+  glass?: boolean;
+  children: ReactNode;
+}
+
+export function Panel({ glass = true, className, children, ...props }: PanelProps) {
+  return (
+    <div
+      className={cn(
+        'rounded-lg border border-wing-border p-3',
+        glass
+          ? 'bg-wing-glass backdrop-blur-lg'
+          : 'bg-wing-surface',
+        className,
+      )}
+      {...props}
+    >
+      {children}
+    </div>
+  );
+}
diff --git a/packages/ui/src/components/Section.tsx b/packages/ui/src/components/Section.tsx
new file mode 100644
index 0000000..542008c
--- /dev/null
+++ b/packages/ui/src/components/Section.tsx
@@ -0,0 +1,29 @@
+import type { HTMLAttributes, ReactNode } from 'react';
+import { cn } from '../utils/cn.ts';
+
+interface SectionProps extends Omit<HTMLAttributes<HTMLElement>, 'title'> {
+  title: ReactNode;
+  actions?: ReactNode;
+  defaultOpen?: boolean;
+  children: ReactNode;
+}
+
+export function Section({ title, actions, defaultOpen = true, className, children, ...props }: SectionProps) {
+  return (
+    <details open={defaultOpen || undefined} className={cn('border-b border-wing-border', className)} {...props}>
+      <summary className="flex cursor-pointer list-none items-center justify-between gap-2 px-3 py-2.5 select-none [&::-webkit-details-marker]:hidden">
+        <span className="text-[9px] font-bold uppercase tracking-[1.5px] text-wing-muted">
+          {title}
+        </span>
+        {actions && (
+          <span onClick={(e) => e.preventDefault()} className="flex items-center gap-1.5">
+            {actions}
+          </span>
+        )}
+      </summary>
+      <div className="px-3 pb-2.5">
+        {children}
+      </div>
+    </details>
+  );
+}
diff --git a/packages/ui/src/components/TextInput.tsx b/packages/ui/src/components/TextInput.tsx
new file mode 100644
index 0000000..b389dbf
--- /dev/null
+++ b/packages/ui/src/components/TextInput.tsx
@@ -0,0 +1,18 @@
+import type { InputHTMLAttributes } from 'react';
+import { cn } from '../utils/cn.ts';
+
+type TextInputProps = InputHTMLAttributes<HTMLInputElement>;
+
+export function TextInput({ className, ...props }: TextInputProps) {
+  return (
+    <input
+      className={cn(
+        'flex-1 rounded-md border border-wing-border bg-wing-card/75 px-2 py-1.5 text-[10px] text-wing-text outline-none',
+        'placeholder:text-wing-muted/90',
+        'focus:border-wing-accent',
+        className,
+      )}
+      {...props}
+    />
+  );
+}
diff --git a/packages/ui/src/components/ToggleButton.tsx b/packages/ui/src/components/ToggleButton.tsx
new file mode 100644
index 0000000..19108f5
--- /dev/null
+++ b/packages/ui/src/components/ToggleButton.tsx
@@ -0,0 +1,24 @@
+import type { ButtonHTMLAttributes, ReactNode } from 'react';
+import { cn } from '../utils/cn.ts';
+
+interface ToggleButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  on?: boolean;
+  children: ReactNode;
+}
+
+export function ToggleButton({ on, className, children, ...props }: ToggleButtonProps) {
+  return (
+    <button
+      className={cn(
+        'cursor-pointer rounded border px-1.5 py-0.5 text-[8px] transition-all duration-150 select-none',
+        on
+          ? 'border-wing-accent bg-wing-accent text-white'
+          : 'border-wing-border bg-wing-card text-wing-muted',
+        className,
+      )}
+      {...props}
+    >
+      {children}
+    </button>
+  );
+}
diff --git a/packages/ui/src/components/index.ts b/packages/ui/src/components/index.ts
index b110510..e254c67 100644
--- a/packages/ui/src/components/index.ts
+++ b/packages/ui/src/components/index.ts
@@ -1 +1,8 @@
-// Components will be added in Step 2
+export { Button } from './Button.tsx';
+export { IconButton } from './IconButton.tsx';
+export { ToggleButton } from './ToggleButton.tsx';
+export { Badge } from './Badge.tsx';
+export { Panel } from './Panel.tsx';
+export { Section } from './Section.tsx';
+export { ListItem } from './ListItem.tsx';
+export { TextInput } from './TextInput.tsx';