diff --git a/src/components/AppSelect.vue b/src/components/AppSelect.vue
index b0fa64ba8..98e05b451 100644
--- a/src/components/AppSelect.vue
+++ b/src/components/AppSelect.vue
@@ -11,6 +11,8 @@ import {
   SelectViewport
 } from 'reka-ui'
 
+import { selectContent, selectItem, selectTrigger } from '@/components/ui/select'
+
 defineProps<{
   options: { value: T; label: string }[]
   placeholder?: string
@@ -23,7 +25,7 @@ const modelValue = defineModel<T>({ required: true })
   <SelectRoot v-model="modelValue">
     <SelectTrigger
       data-test-id="app-select-trigger"
-      class="flex min-w-0 flex-1 cursor-pointer items-center justify-between rounded border border-border bg-input px-1.5 py-1 text-xs text-surface outline-none hover:bg-hover"
+      :class="selectTrigger({ class: 'min-w-0 flex-1 rounded px-1.5 py-1 text-xs' })"
     >
       <SelectValue :placeholder="placeholder" />
       <icon-lucide-chevron-down class="ml-1 size-3 shrink-0 text-muted" />
@@ -32,14 +34,14 @@ const modelValue = defineModel<T>({ required: true })
       <SelectContent
         position="popper"
         :side-offset="2"
-        class="z-50 max-h-56 min-w-[var(--reka-select-trigger-width)] overflow-hidden rounded-md border border-border bg-panel shadow-lg"
+        :class="selectContent({ class: 'max-h-56 min-w-[var(--reka-select-trigger-width)]' })"
       >
         <SelectViewport class="p-0.5">
           <SelectItem
             v-for="opt in options"
             :key="String(opt.value)"
             :value="opt.value"
-            class="relative flex cursor-pointer items-center rounded py-1.5 pl-6 pr-2 text-xs text-surface outline-none data-[highlighted]:bg-hover"
+            :class="selectItem({ class: 'rounded py-1.5 pl-6 pr-2 text-xs' })"
           >
             <SelectItemIndicator class="absolute left-1.5 inline-flex items-center justify-center">
               <icon-lucide-check class="size-3 text-accent" />
diff --git a/src/components/FontPicker.vue b/src/components/FontPicker.vue
index 0a0fdb1bf..ca9e4d14f 100644
--- a/src/components/FontPicker.vue
+++ b/src/components/FontPicker.vue
@@ -12,6 +12,8 @@ import {
   useFilter
 } from 'reka-ui'
 
+import { selectContent, selectItem, selectTrigger } from '@/components/ui/select'
+import { panelSurface } from '@/components/ui/surface'
 import { listFamilies } from '@/engine/fonts'
 
 const modelValue = defineModel<string>({ required: true })
@@ -51,7 +53,7 @@ function onSelect(val: string) {
     <PopoverAnchor>
       <button
         data-test-id="font-picker-trigger"
-        class="flex w-full cursor-pointer items-center justify-between rounded border border-border bg-input px-2 py-1 text-xs text-surface hover:bg-hover"
+        :class="selectTrigger({ class: 'w-full rounded px-2 py-1 text-xs' })"
         @click="open = !open"
       >
         <span class="truncate">{{ modelValue }}</span>
@@ -61,7 +63,7 @@ function onSelect(val: string) {
     <PopoverContent
       :side-offset="2"
       align="start"
-      class="z-50 flex min-w-56 w-[var(--reka-popper-anchor-width)] flex-col overflow-hidden rounded-md border border-border bg-panel shadow-lg"
+      :class="panelSurface({ radius: 'md', padding: 'none', class: 'z-50 flex min-w-56 w-[var(--reka-popper-anchor-width)] flex-col overflow-hidden' })"
       @open-auto-focus.prevent
     >
       <ListboxRoot :model-value="modelValue" @update:model-value="onSelect">
@@ -89,7 +91,7 @@ function onSelect(val: string) {
             <ListboxItem
               :value="option"
               data-test-id="font-picker-item"
-              class="flex w-full cursor-pointer items-center gap-2 px-2 py-2 text-sm text-surface outline-none data-[highlighted]:bg-hover"
+              :class="selectItem({ class: 'w-full gap-2 px-2 py-2 text-sm' })"
               :style="{ fontFamily: `'${option}', sans-serif` }"
             >
               <icon-lucide-check v-if="option === modelValue" class="size-3 shrink-0 text-accent" />
diff --git a/src/components/chat/ChatInput.vue b/src/components/chat/ChatInput.vue
index 09730fadf..34ac7672d 100644
--- a/src/components/chat/ChatInput.vue
+++ b/src/components/chat/ChatInput.vue
@@ -15,6 +15,8 @@ import {
 } from 'reka-ui'
 import { computed, ref } from 'vue'
 
+import { uiButton } from '@/components/ui/button'
+import { selectContent, selectItem, selectTrigger } from '@/components/ui/select'
 import { MODELS, useAIChat } from '@/composables/use-chat'
 
 const { modelId } = useAIChat()
@@ -52,7 +54,7 @@ function handleSubmit(e: Event) {
         <SelectRoot v-model="modelId">
           <SelectTrigger
             data-test-id="chat-model-selector"
-            class="flex items-center gap-1 rounded px-1.5 py-0.5 text-[10px] text-muted hover:bg-hover hover:text-surface"
+            :class="selectTrigger({ class: 'gap-1 rounded border-none bg-transparent px-1.5 py-0.5 text-[10px] text-muted' })"
           >
             <icon-lucide-bot class="size-3" />
             {{ selectedModelName }}
@@ -63,14 +65,14 @@ function handleSubmit(e: Event) {
               position="popper"
               side="top"
               :side-offset="4"
-              class="z-50 max-h-60 overflow-y-auto rounded-lg border border-border bg-panel p-1 shadow-lg"
+              :class="selectContent({ radius: 'lg', padding: 'md', class: 'max-h-60 overflow-y-auto' })"
             >
               <SelectViewport>
                 <SelectItem
                   v-for="model in MODELS"
                   :key="model.id"
                   :value="model.id"
-                  class="flex cursor-pointer items-center gap-2 rounded px-2 py-1.5 text-[11px] text-surface outline-none data-[highlighted]:bg-hover"
+                  :class="selectItem({ class: 'gap-2 rounded px-2 py-1.5 text-[11px]' })"
                 >
                   <SelectItemText class="flex-1">{{ model.name }}</SelectItemText>
                   <span
@@ -101,7 +103,7 @@ function handleSubmit(e: Event) {
             <button
               type="button"
               data-test-id="chat-stop-button"
-              class="shrink-0 rounded border border-border px-2 py-1.5 text-xs text-muted hover:bg-hover"
+              :class="uiButton({ tone: 'ghost', shape: 'rounded', size: 'sm', class: 'shrink-0 border border-border px-2 py-1.5' })"
               @click="emit('stop')"
             >
               <icon-lucide-square class="size-3" />
@@ -122,7 +124,7 @@ function handleSubmit(e: Event) {
             <button
               type="submit"
               data-test-id="chat-send-button"
-              class="shrink-0 rounded bg-accent px-2.5 py-1.5 text-xs font-medium text-white hover:bg-accent/90"
+              :class="uiButton({ tone: 'accent', shape: 'rounded', size: 'sm', class: 'shrink-0 px-2.5 py-1.5 font-medium' })"
               :disabled="!input.trim()"
             >
               <icon-lucide-send class="size-3" />
diff --git a/src/components/ui/button.ts b/src/components/ui/button.ts
new file mode 100644
index 000000000..2edb918be
--- /dev/null
+++ b/src/components/ui/button.ts
@@ -0,0 +1,60 @@
+import { tv } from 'tailwind-variants'
+import { twMerge } from 'tailwind-merge'
+
+const button = tv({
+  base: 'inline-flex items-center justify-center transition-colors select-none',
+  variants: {
+    tone: {
+      ghost: 'bg-transparent text-muted hover:bg-hover hover:text-surface',
+      accent: 'bg-accent text-white hover:bg-accent/90',
+      panel: 'bg-panel/70 text-surface backdrop-blur-xl',
+      panelAccent: 'bg-panel/70 text-accent border-accent/20 backdrop-blur-xl'
+    },
+    shape: {
+      square: 'rounded',
+      rounded: 'rounded-md',
+      pill: 'rounded-full'
+    },
+    size: {
+      sm: 'h-7 px-2 text-xs',
+      md: 'h-8 px-3 text-xs',
+      icon: 'size-8',
+      iconSm: 'size-7'
+    },
+    bordered: {
+      true: 'border border-white/10',
+      false: ''
+    },
+    active: {
+      true: '',
+      false: ''
+    }
+  },
+  compoundVariants: [
+    { tone: 'accent', size: 'icon', class: 'px-0' },
+    { tone: 'ghost', size: 'icon', class: 'px-0' },
+    { tone: 'panel', size: 'icon', class: 'shadow-md' },
+    { tone: 'panel', size: 'iconSm', class: 'shadow-sm' },
+    { tone: 'panelAccent', size: 'icon', class: 'shadow-md' },
+    { tone: 'panel', bordered: true, class: 'border border-white/10' },
+    { tone: 'panelAccent', bordered: true, class: 'border' }
+  ],
+  defaultVariants: {
+    tone: 'ghost',
+    shape: 'rounded',
+    size: 'sm',
+    bordered: false,
+    active: false
+  }
+})
+
+export function uiButton(options?: {
+  tone?: 'ghost' | 'accent' | 'panel' | 'panelAccent'
+  shape?: 'square' | 'rounded' | 'pill'
+  size?: 'sm' | 'md' | 'icon' | 'iconSm'
+  bordered?: boolean
+  active?: boolean
+  class?: string
+}) {
+  return twMerge(button(options), options?.class)
+}
diff --git a/src/components/ui/select.ts b/src/components/ui/select.ts
new file mode 100644
index 000000000..b98d1107d
--- /dev/null
+++ b/src/components/ui/select.ts
@@ -0,0 +1,51 @@
+import { tv } from 'tailwind-variants'
+import { twMerge } from 'tailwind-merge'
+
+const trigger = tv({
+  base: 'flex items-center justify-between border border-border bg-input text-surface outline-none hover:bg-hover'
+})
+
+const content = tv({
+  base: 'z-50 overflow-hidden border border-border bg-panel',
+  variants: {
+    radius: {
+      md: 'rounded-md',
+      lg: 'rounded-lg'
+    },
+    elevation: {
+      lg: 'shadow-lg',
+      xl: 'shadow-xl'
+    },
+    padding: {
+      none: '',
+      sm: 'p-0.5',
+      md: 'p-1'
+    }
+  },
+  defaultVariants: {
+    radius: 'md',
+    elevation: 'lg',
+    padding: 'sm'
+  }
+})
+
+const item = tv({
+  base: 'relative flex cursor-pointer items-center text-surface outline-none data-[highlighted]:bg-hover'
+})
+
+export function selectTrigger(options?: { class?: string }) {
+  return twMerge(trigger(), options?.class)
+}
+
+export function selectContent(options?: {
+  radius?: 'md' | 'lg'
+  elevation?: 'lg' | 'xl'
+  padding?: 'none' | 'sm' | 'md'
+  class?: string
+}) {
+  return twMerge(content(options), options?.class)
+}
+
+export function selectItem(options?: { class?: string }) {
+  return twMerge(item(), options?.class)
+}
diff --git a/src/components/ui/surface.ts b/src/components/ui/surface.ts
new file mode 100644
index 000000000..4eb9a9409
--- /dev/null
+++ b/src/components/ui/surface.ts
@@ -0,0 +1,39 @@
+import { tv } from 'tailwind-variants'
+import { twMerge } from 'tailwind-merge'
+
+const surface = tv({
+  base: 'border border-border bg-panel',
+  variants: {
+    elevation: {
+      md: 'shadow-md',
+      lg: 'shadow-lg',
+      xl: 'shadow-xl',
+      overlay: 'shadow-[0_8px_30px_rgb(0_0_0/0.4)]'
+    },
+    radius: {
+      md: 'rounded-md',
+      lg: 'rounded-lg',
+      xl: 'rounded-xl'
+    },
+    padding: {
+      none: '',
+      sm: 'p-1',
+      md: 'p-2',
+      lg: 'p-3'
+    }
+  },
+  defaultVariants: {
+    elevation: 'lg',
+    radius: 'lg',
+    padding: 'sm'
+  }
+})
+
+export function panelSurface(options?: {
+  elevation?: 'md' | 'lg' | 'xl' | 'overlay'
+  radius?: 'md' | 'lg' | 'xl'
+  padding?: 'none' | 'sm' | 'md' | 'lg'
+  class?: string
+}) {
+  return twMerge(surface(options), options?.class)
+}