diff --git a/src/components/Chat.tsx b/src/components/Chat.tsx
index ab41548..f93380d 100644
--- a/src/components/Chat.tsx
+++ b/src/components/Chat.tsx
@@ -136,30 +136,30 @@ export function Chat({ messages, isGenerating, isLoadingHistory, status, session
       <div ref={scrollContainerRef} className="flex-1 overflow-y-auto overflow-x-hidden relative" role="log" aria-label={t('chat.messages')} aria-live="polite">
         <div className="max-w-4xl mx-auto py-4 w-full">
           {messages.length === 0 && isLoadingHistory && (
-            <div className="flex flex-col items-center justify-center h-[60vh] text-zinc-500">
-              <Loader2 className="h-8 w-8 text-cyan-300/60 animate-spin mb-4" />
-              <div className="text-sm text-zinc-500">{t('chat.loadingHistory')}</div>
+            <div className="flex flex-col items-center justify-center h-[60vh] text-pc-text-muted">
+              <Loader2 className="h-8 w-8 text-pc-accent-light/60 animate-spin mb-4" />
+              <div className="text-sm text-pc-text-muted">{t('chat.loadingHistory')}</div>
             </div>
           )}
           {messages.length === 0 && !isLoadingHistory && (
-            <div className="flex flex-col items-center justify-center h-[60vh] text-zinc-500">
+            <div className="flex flex-col items-center justify-center h-[60vh] text-pc-text-muted">
               <div className="relative mb-6">
                 <div className="absolute -inset-4 rounded-3xl bg-gradient-to-r from-cyan-400/10 via-indigo-500/10 to-violet-500/10 blur-2xl" />
-                <div className="relative flex h-16 w-16 items-center justify-center rounded-3xl border border-white/8 bg-zinc-800/40">
-                  <Bot className="h-8 w-8 text-cyan-200" />
+                <div className="relative flex h-16 w-16 items-center justify-center rounded-3xl border border-pc-border bg-pc-elevated/40">
+                  <Bot className="h-8 w-8 text-pc-accent-light" />
                 </div>
               </div>
-              <div className="text-lg text-zinc-200 font-semibold">{t('chat.welcome')}</div>
-              <div className="text-sm mt-1 text-zinc-500">{t('chat.welcomeSub')}</div>
+              <div className="text-lg text-pc-text font-semibold">{t('chat.welcome')}</div>
+              <div className="text-sm mt-1 text-pc-text-muted">{t('chat.welcomeSub')}</div>
             </div>
           )}
           {visibleMessages.map(({ msg, showSep }) => (
                 <div key={msg.id}>
                   {showSep && (
                     <div className="flex items-center gap-3 py-3 px-4 select-none" aria-label={formatDateSeparator(msg.timestamp, t)}>
-                      <div className="flex-1 h-px bg-white/8" />
-                      <span className="text-[11px] font-medium text-zinc-500 uppercase tracking-wider">{formatDateSeparator(msg.timestamp, t)}</span>
-                      <div className="flex-1 h-px bg-white/8" />
+                      <div className="flex-1 h-px bg-[var(--pc-hover-strong)]" />
+                      <span className="text-[11px] font-medium text-pc-text-muted uppercase tracking-wider">{formatDateSeparator(msg.timestamp, t)}</span>
+                      <div className="flex-1 h-px bg-[var(--pc-hover-strong)]" />
                     </div>
                   )}
                   <ChatMessageComponent message={msg} onRetry={!isGenerating ? handleSend : undefined} agentAvatarUrl={agentAvatarUrl} />
@@ -176,7 +176,7 @@ export function Chat({ messages, isGenerating, isLoadingHistory, status, session
             onClick={globalState === 'expand-all' ? collapseAll : expandAll}
             aria-label={globalState === 'expand-all' ? t('chat.collapseTools') : t('chat.expandTools')}
             title={globalState === 'expand-all' ? t('chat.collapseTools') : t('chat.expandTools')}
-            className="flex items-center gap-1.5 rounded-full border border-white/10 bg-zinc-800/90 backdrop-blur-lg px-3 py-2 text-xs text-zinc-300 shadow-lg hover:bg-zinc-700/90 transition-all hover:shadow-violet-500/10"
+            className="flex items-center gap-1.5 rounded-full border border-pc-border-strong bg-pc-elevated/90 backdrop-blur-lg px-3 py-2 text-xs text-pc-text shadow-lg hover:bg-pc-elevated/90 transition-all hover:shadow-violet-500/10"
           >
             {globalState === 'expand-all' ? <ChevronsDownUp size={14} className="text-violet-300" /> : <ChevronsUpDown size={14} className="text-violet-300" />}
           </button>
@@ -185,9 +185,9 @@ export function Chat({ messages, isGenerating, isLoadingHistory, status, session
           <button
             onClick={() => scrollToBottom('smooth')}
             aria-label={t('chat.scrollToBottom')}
-            className="flex items-center gap-1.5 rounded-full border border-white/10 bg-zinc-800/90 backdrop-blur-lg px-3.5 py-2 text-xs text-zinc-300 shadow-lg hover:bg-zinc-700/90 transition-all hover:shadow-cyan-500/10"
+            className="flex items-center gap-1.5 rounded-full border border-pc-border-strong bg-pc-elevated/90 backdrop-blur-lg px-3.5 py-2 text-xs text-pc-text shadow-lg hover:bg-pc-elevated/90 transition-all hover:shadow-cyan-500/10"
           >
-            <ArrowDown size={14} className="text-cyan-300" />
+            <ArrowDown size={14} className="text-pc-accent-light" />
             <span className="hidden sm:inline">{t('chat.scrollToBottom')}</span>
           </button>
         )}
diff --git a/src/components/ChatInput.tsx b/src/components/ChatInput.tsx
index 832649c..6ea51e6 100644
--- a/src/components/ChatInput.tsx
+++ b/src/components/ChatInput.tsx
@@ -214,7 +214,7 @@ export function ChatInput({ onSend, onAbort, isGenerating, disabled, sessionKey
 
   return (
     <div
-      className="border-t border-white/8 bg-[var(--pc-bg-input)]/60 backdrop-blur-xl p-4"
+      className="border-t border-pc-border bg-[var(--pc-bg-input)]/60 backdrop-blur-xl p-4"
       role="form"
       aria-label={t('chat.inputLabel')}
       onDragOver={handleDragOver}
@@ -222,26 +222,26 @@ export function ChatInput({ onSend, onAbort, isGenerating, disabled, sessionKey
       onDrop={handleDrop}
     >
       <div className="max-w-4xl mx-auto">
-        <div className={`rounded-3xl border bg-[var(--pc-bg-surface)]/40 p-3 shadow-[0_0_0_1px_rgba(255,255,255,0.03)] transition-colors ${isDragOver ? 'border-cyan-400/40 bg-cyan-400/5' : 'border-white/8'}`}>
+        <div className={`rounded-3xl border bg-[var(--pc-bg-surface)]/40 p-3 shadow-[0_0_0_1px_rgba(255,255,255,0.03)] transition-colors ${isDragOver ? 'border-[var(--pc-accent-dim)] bg-[var(--pc-accent-glow)]' : 'border-pc-border'}`}>
           {/* File previews */}
           {files.length > 0 && (
             <div className="flex flex-wrap gap-2 mb-3 px-1">
               {files.map(f => (
-                <div key={f.id} className="group relative flex items-center gap-2 rounded-2xl border border-white/8 bg-zinc-800/50 px-3 py-2 text-xs text-zinc-400">
+                <div key={f.id} className="group relative flex items-center gap-2 rounded-2xl border border-pc-border bg-pc-elevated/50 px-3 py-2 text-xs text-pc-text-secondary">
                   {f.preview ? (
                     <img src={f.preview} alt="" className="h-8 w-8 rounded-lg object-cover" />
                   ) : (
-                    <FileText size={16} className="text-zinc-500 shrink-0" />
+                    <FileText size={16} className="text-pc-text-muted shrink-0" />
                   )}
                   <div className="min-w-0 max-w-[120px]">
-                    <div className="truncate text-zinc-300">{f.file.name}</div>
-                    <div className="text-[10px] text-zinc-500">{formatSize(f.file.size)}</div>
+                    <div className="truncate text-pc-text">{f.file.name}</div>
+                    <div className="text-[10px] text-pc-text-muted">{formatSize(f.file.size)}</div>
                   </div>
                   <button
                     onClick={() => removeFile(f.id)}
-                    className="absolute -top-1.5 -right-1.5 h-5 w-5 rounded-full bg-zinc-700 border border-white/10 flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity hover:bg-red-500/80"
+                    className="absolute -top-1.5 -right-1.5 h-5 w-5 rounded-full bg-pc-elevated border border-pc-border-strong flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity hover:bg-red-500/80"
                   >
-                    <X size={10} className="text-zinc-200" />
+                    <X size={10} className="text-pc-text" />
                   </button>
                 </div>
               ))}
@@ -253,7 +253,7 @@ export function ChatInput({ onSend, onAbort, isGenerating, disabled, sessionKey
             <button
               onClick={() => fileInputRef.current?.click()}
               disabled={disabled}
-              className="shrink-0 h-11 w-11 rounded-2xl border border-white/8 bg-zinc-800/30 flex items-center justify-center text-zinc-400 hover:text-cyan-300 hover:bg-white/5 transition-colors disabled:opacity-30"
+              className="shrink-0 h-11 w-11 rounded-2xl border border-pc-border bg-pc-elevated/30 flex items-center justify-center text-pc-text-secondary hover:text-pc-accent-light hover:bg-[var(--pc-hover)] transition-colors disabled:opacity-30"
               title={t('chat.attachFile')}
               aria-label={t('chat.attachFile')}
             >
@@ -278,7 +278,7 @@ export function ChatInput({ onSend, onAbort, isGenerating, disabled, sessionKey
               aria-label={t('chat.inputLabel')}
               disabled={disabled}
               rows={1}
-              className="flex-1 bg-transparent resize-none rounded-2xl border border-white/8 bg-zinc-900/35 px-4 py-3 text-sm text-zinc-300 placeholder:text-zinc-500 outline-none focus:ring-2 focus:ring-cyan-400/30 transition-all max-h-[200px]"
+              className="flex-1 bg-transparent resize-none rounded-2xl border border-pc-border bg-pc-input/35 px-4 py-3 text-sm text-pc-text placeholder:text-pc-text-muted outline-none focus:ring-2 focus:ring-[var(--pc-accent-dim)] transition-all max-h-[200px]"
             />
             {isGenerating ? (
               <button
@@ -293,7 +293,7 @@ export function ChatInput({ onSend, onAbort, isGenerating, disabled, sessionKey
                 onClick={handleSubmit}
                 disabled={(!text.trim() && files.length === 0) || disabled}
                 aria-label={t('chat.send')}
-                className="shrink-0 h-11 px-5 rounded-2xl bg-gradient-to-r from-cyan-500/80 via-indigo-500/70 to-violet-500/80 text-zinc-900 font-semibold text-sm hover:opacity-90 shadow-[0_8px_24px_rgba(34,211,238,0.1)] disabled:opacity-30 disabled:shadow-none transition-all flex items-center gap-2"
+                className="shrink-0 h-11 px-5 rounded-2xl bg-gradient-to-r from-cyan-500/80 via-indigo-500/70 to-violet-500/80 text-pc-text font-semibold text-sm hover:opacity-90 shadow-[0_8px_24px_rgba(34,211,238,0.1)] disabled:opacity-30 disabled:shadow-none transition-all flex items-center gap-2"
               >
                 <Send size={16} />
                 <span className="hidden sm:inline">{t('chat.send')}</span>
diff --git a/src/components/ChatMessage.tsx b/src/components/ChatMessage.tsx
index c9f7108..4b9d932 100644
--- a/src/components/ChatMessage.tsx
+++ b/src/components/ChatMessage.tsx
@@ -204,15 +204,15 @@ function InternalsSummary({ blocks }: { blocks: MessageBlock[] }) {
 function InternalOnlyMessage({ message }: { message: ChatMessageType }) {
   return (
     <div className="animate-fade-in flex gap-3 px-4 py-1">
-      <div className="shrink-0 mt-0.5 flex h-6 w-6 items-center justify-center rounded-xl border border-white/5 bg-zinc-800/30">
-        <Wrench className="h-3 w-3 text-zinc-500" />
+      <div className="shrink-0 mt-0.5 flex h-6 w-6 items-center justify-center rounded-xl border border-pc-border bg-pc-elevated/30">
+        <Wrench className="h-3 w-3 text-pc-text-muted" />
       </div>
       <div className="min-w-0 flex-1">
         <div className="space-y-1">
           {renderInternalBlocks(message.blocks)}
         </div>
         {message.timestamp && (
-          <div className="mt-0.5 text-[10px] text-zinc-600">
+          <div className="mt-0.5 text-[10px] text-pc-text-faint">
             {formatTimestamp(message.timestamp)}
           </div>
         )}
@@ -233,7 +233,7 @@ function CopyButton({ text }: { text: string }) {
   return (
     <button
       onClick={handleCopy}
-      className="absolute top-2 right-2 h-7 w-7 rounded-lg border border-white/8 bg-zinc-800/80 backdrop-blur-sm flex items-center justify-center text-zinc-400 hover:text-cyan-300 hover:border-cyan-400/30 transition-all opacity-0 group-hover:opacity-100"
+      className="absolute top-2 right-2 h-7 w-7 rounded-lg border border-pc-border bg-pc-elevated/80 backdrop-blur-sm flex items-center justify-center text-pc-text-secondary hover:text-pc-accent-light hover:border-[var(--pc-accent-dim)] transition-all opacity-0 group-hover:opacity-100"
       title={copied ? t('message.copied') : t('message.copy')}
       aria-label={t('message.copy')}
     >
@@ -271,18 +271,18 @@ function MetadataViewer({ metadata }: { metadata?: Record<string, unknown> }) {
       <button
         ref={btnRef}
         onClick={() => setOpen(o => !o)}
-        className="h-7 w-7 rounded-lg border border-white/8 bg-zinc-800/80 backdrop-blur-sm flex items-center justify-center text-zinc-400 hover:text-cyan-300 hover:border-cyan-400/30 transition-all opacity-0 group-hover:opacity-100"
+        className="h-7 w-7 rounded-lg border border-pc-border bg-pc-elevated/80 backdrop-blur-sm flex items-center justify-center text-pc-text-secondary hover:text-pc-accent-light hover:border-[var(--pc-accent-dim)] transition-all opacity-0 group-hover:opacity-100"
         title={t('message.metadata')}
         aria-label={t('message.metadata')}
       >
         <Info size={13} />
       </button>
       {open && pos && createPortal(
-        <div ref={panelRef} className="fixed z-[9999] w-72 max-h-64 overflow-auto rounded-xl border border-white/10 bg-zinc-900/95 backdrop-blur-md shadow-xl p-3 text-[11px] text-zinc-400 font-mono leading-relaxed custom-scrollbar" style={{ top: pos.top, left: pos.left, transform: 'translateY(-100%)' }}>
+        <div ref={panelRef} className="fixed z-[9999] w-72 max-h-64 overflow-auto rounded-xl border border-pc-border-strong bg-pc-input/95 backdrop-blur-md shadow-xl p-3 text-[11px] text-pc-text-secondary font-mono leading-relaxed custom-scrollbar" style={{ top: pos.top, left: pos.left, transform: 'translateY(-100%)' }}>
           {Object.entries(metadata).map(([k, v]) => (
             <div key={k} className="flex gap-2 py-0.5">
-              <span className="text-cyan-400/70 shrink-0">{k}:</span>
-              <span className="text-zinc-300 break-all">{typeof v === 'object' ? JSON.stringify(v) : String(v)}</span>
+              <span className="text-pc-accent/70 shrink-0">{k}:</span>
+              <span className="text-pc-text break-all">{typeof v === 'object' ? JSON.stringify(v) : String(v)}</span>
             </div>
           ))}
         </div>,
@@ -309,12 +309,12 @@ function SystemEventMessage({ message }: { message: ChatMessageType }) {
 
   return (
     <div className="animate-fade-in flex items-center justify-center gap-2 px-4 py-1.5 my-0.5">
-      <div className="flex items-center gap-1.5 max-w-[85%] rounded-full px-3 py-1 bg-zinc-800/30 border border-white/5">
-        <Zap className="h-3 w-3 text-zinc-500 shrink-0" />
-        <span className="text-[11px] font-medium text-zinc-500 shrink-0">{label}</span>
-        <span className="text-[11px] text-zinc-500 truncate">{display}</span>
+      <div className="flex items-center gap-1.5 max-w-[85%] rounded-full px-3 py-1 bg-pc-elevated/30 border border-pc-border">
+        <Zap className="h-3 w-3 text-pc-text-muted shrink-0" />
+        <span className="text-[11px] font-medium text-pc-text-muted shrink-0">{label}</span>
+        <span className="text-[11px] text-pc-text-muted truncate">{display}</span>
         {message.timestamp && (
-          <span className="text-[10px] text-zinc-600 shrink-0 ml-1">{formatTimestamp(message.timestamp)}</span>
+          <span className="text-[10px] text-pc-text-faint shrink-0 ml-1">{formatTimestamp(message.timestamp)}</span>
         )}
       </div>
     </div>
@@ -343,12 +343,12 @@ export function ChatMessageComponent({ message, onRetry, agentAvatarUrl }: { mes
   return (
     <div className={`animate-fade-in flex gap-3 px-4 py-2 ${isUser ? 'flex-row-reverse' : ''}`}>
       {/* Avatar */}
-      <div className="shrink-0 mt-1 flex h-9 w-9 items-center justify-center rounded-2xl border border-white/8 bg-zinc-800/40 overflow-hidden">
+      <div className="shrink-0 mt-1 flex h-9 w-9 items-center justify-center rounded-2xl border border-pc-border bg-pc-elevated/40 overflow-hidden">
         {isUser
-          ? <User className="h-4 w-4 text-cyan-200" />
+          ? <User className="h-4 w-4 text-pc-accent-light" />
           : agentAvatarUrl
             ? <img src={agentAvatarUrl} alt="Agent" className="h-full w-full object-cover" />
-            : <Bot className="h-4 w-4 text-cyan-200" />
+            : <Bot className="h-4 w-4 text-pc-accent-light" />
         }
       </div>
 
@@ -356,8 +356,8 @@ export function ChatMessageComponent({ message, onRetry, agentAvatarUrl }: { mes
       <div className={`min-w-0 max-w-[80%] ${isUser ? 'text-right' : ''}`}>
         <div className={`group relative inline-block text-left rounded-3xl px-4 py-3 text-sm leading-relaxed max-w-full overflow-hidden ${
           isUser
-            ? 'bg-gradient-to-b from-cyan-800/40 to-cyan-900/25 text-zinc-100 border border-cyan-400/30'
-            : 'bg-zinc-800/40 text-zinc-300 border border-white/8 shadow-[0_0_0_1px_rgba(255,255,255,0.03)]'
+            ? 'bg-[var(--pc-user-bubble)] text-pc-text border border-[var(--pc-user-border)]'
+            : 'bg-pc-elevated/40 text-pc-text border border-pc-border shadow-[0_0_0_1px_rgba(255,255,255,0.03)]'
         }`}>
           {/* Action buttons */}
           {!isUser && !message.isStreaming && getPlainText(message).trim() && (
@@ -370,7 +370,7 @@ export function ChatMessageComponent({ message, onRetry, agentAvatarUrl }: { mes
           {isUser && onRetry && (
             <button
               onClick={() => onRetry(getPlainText(message))}
-              className="absolute top-2 right-2 h-7 w-7 rounded-lg border border-white/8 bg-zinc-800/80 backdrop-blur-sm flex items-center justify-center text-zinc-400 hover:text-cyan-300 hover:border-cyan-400/30 transition-all opacity-0 group-hover:opacity-100"
+              className="absolute top-2 right-2 h-7 w-7 rounded-lg border border-pc-border bg-pc-elevated/80 backdrop-blur-sm flex items-center justify-center text-pc-text-secondary hover:text-pc-accent-light hover:border-[var(--pc-accent-dim)] transition-all opacity-0 group-hover:opacity-100"
               title={t('message.retry')}
               aria-label={t('message.retry')}
             >
@@ -408,7 +408,7 @@ export function ChatMessageComponent({ message, onRetry, agentAvatarUrl }: { mes
           {!isUser && <InternalsSummary blocks={message.blocks} />}
         </div>
         {message.timestamp && (
-          <div className={`mt-1 text-[11px] text-zinc-500 ${isUser ? 'text-right pr-2' : 'pl-2'}`}>
+          <div className={`mt-1 text-[11px] text-pc-text-muted ${isUser ? 'text-right pr-2' : 'pl-2'}`}>
             {formatTimestamp(message.timestamp)}
           </div>
         )}
diff --git a/src/components/CodeBlock.tsx b/src/components/CodeBlock.tsx
index 6749946..18bc291 100644
--- a/src/components/CodeBlock.tsx
+++ b/src/components/CodeBlock.tsx
@@ -60,14 +60,14 @@ export function CodeBlock(props: HTMLAttributes<HTMLPreElement>) {
   return (
     <div className="group/code relative">
       {language && (
-        <div className="flex items-center justify-between px-4 py-1.5 bg-zinc-800/80 border-b border-white/5 rounded-t-lg text-[11px] text-zinc-500 font-mono select-none">
+        <div className="flex items-center justify-between px-4 py-1.5 bg-pc-elevated/80 border-b border-pc-border rounded-t-lg text-[11px] text-pc-text-muted font-mono select-none">
           {formatLanguage(language)}
         </div>
       )}
       <pre {...props} className={`${props.className || ''} ${language ? '!rounded-t-none !mt-0' : ''}`} />
       <button
         onClick={handleCopy}
-        className="absolute top-2 right-2 p-1.5 rounded-lg bg-zinc-700/60 hover:bg-zinc-600/80 border border-white/10 text-zinc-400 hover:text-zinc-200 opacity-0 group-hover/code:opacity-100 transition-opacity duration-150"
+        className="absolute top-2 right-2 p-1.5 rounded-lg bg-pc-elevated/60 hover:bg-pc-elevated/80 border border-pc-border-strong text-pc-text-secondary hover:text-pc-text opacity-0 group-hover/code:opacity-100 transition-opacity duration-150"
         title="Copy code"
         aria-label="Copy code to clipboard"
         type="button"
diff --git a/src/components/ErrorBoundary.tsx b/src/components/ErrorBoundary.tsx
index ba69531..ba0e15f 100644
--- a/src/components/ErrorBoundary.tsx
+++ b/src/components/ErrorBoundary.tsx
@@ -40,30 +40,30 @@ export class ErrorBoundary extends Component<Props, State> {
       if (this.props.fallback) return this.props.fallback;
 
       return (
-        <div className="h-dvh flex items-center justify-center bg-[var(--pc-bg-base)] text-zinc-300 p-6">
+        <div className="h-dvh flex items-center justify-center bg-[var(--pc-bg-base)] text-pc-text p-6">
           <div className="max-w-md w-full space-y-4 text-center">
             <div className="text-4xl">💥</div>
-            <h1 className="text-xl font-semibold text-zinc-100">
+            <h1 className="text-xl font-semibold text-pc-text">
               {t('error.title')}
             </h1>
-            <p className="text-sm text-zinc-400">
+            <p className="text-sm text-pc-text-secondary">
               {t('error.description')}
             </p>
             {this.state.error && (
-              <pre className="mt-3 p-3 rounded-lg bg-zinc-800/60 text-xs text-red-400 text-left overflow-auto max-h-32">
+              <pre className="mt-3 p-3 rounded-lg bg-pc-elevated/60 text-xs text-red-400 text-left overflow-auto max-h-32">
                 {this.state.error.message}
               </pre>
             )}
             <div className="flex gap-3 justify-center pt-2">
               <button
                 onClick={this.handleRetry}
-                className="px-4 py-2 rounded-lg bg-zinc-700 hover:bg-zinc-600 text-sm font-medium transition-colors"
+                className="px-4 py-2 rounded-lg bg-pc-elevated hover:bg-pc-elevated text-sm font-medium transition-colors"
               >
                 {t('error.retry')}
               </button>
               <button
                 onClick={this.handleReload}
-                className="px-4 py-2 rounded-lg bg-cyan-600 hover:bg-cyan-500 text-sm font-medium transition-colors"
+                className="px-4 py-2 rounded-lg bg-[var(--pc-accent)] hover:bg-[var(--pc-accent-light)] text-sm font-medium transition-colors"
               >
                 {t('error.reload')}
               </button>
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
index 4e92cda..e17eb3f 100644
--- a/src/components/Header.tsx
+++ b/src/components/Header.tsx
@@ -33,23 +33,23 @@ export function Header({ status, sessionKey, onToggleSidebar, activeSessionData,
 
   return (
     <>
-    <header className="h-14 border-b border-white/8 bg-[var(--pc-bg-surface)]/90 backdrop-blur-xl flex items-center px-4 gap-3 shrink-0" role="banner">
-      <button onClick={onToggleSidebar} aria-label={t('header.toggleSidebar')} className="lg:hidden p-2 rounded-2xl hover:bg-white/5 text-zinc-400 transition-colors">
+    <header className="h-14 border-b border-pc-border bg-[var(--pc-bg-surface)]/90 backdrop-blur-xl flex items-center px-4 gap-3 shrink-0" role="banner">
+      <button onClick={onToggleSidebar} aria-label={t('header.toggleSidebar')} className="lg:hidden p-2 rounded-2xl hover:bg-[var(--pc-hover)] text-pc-text-secondary transition-colors">
         <Menu size={20} />
       </button>
       <div className="flex items-center gap-3 flex-1 min-w-0">
         <img src={agentAvatarUrl || '/logo.png'} alt="PinchChat" className="h-9 w-9 rounded-2xl object-cover" />
         <div className="min-w-0">
           <div className="flex items-center gap-2">
-            <span className="font-semibold text-zinc-300 text-sm tracking-wide">{t('header.title')}</span>
-            <Sparkles className="h-3.5 w-3.5 text-cyan-300/60" />
+            <span className="font-semibold text-pc-text text-sm tracking-wide">{t('header.title')}</span>
+            <Sparkles className="h-3.5 w-3.5 text-pc-accent-light/60" />
           </div>
-          <span className="text-xs text-zinc-500 truncate flex items-center gap-1.5">
+          <span className="text-xs text-pc-text-muted truncate flex items-center gap-1.5">
             {activeSessionData?.agentId && (
-              <span className="inline-flex items-center gap-0.5 text-cyan-400/70 font-medium">
+              <span className="inline-flex items-center gap-0.5 text-pc-accent/70 font-medium">
                 <Bot className="h-3 w-3" />
                 {activeSessionData.agentId}
-                <span className="text-zinc-600 mx-0.5">·</span>
+                <span className="text-pc-text-faint mx-0.5">·</span>
               </span>
             )}
             {sessionLabel}
@@ -61,7 +61,7 @@ export function Header({ status, sessionKey, onToggleSidebar, activeSessionData,
           <button
             onClick={onToggleSound}
             aria-label={soundEnabled ? t('header.soundOff') : t('header.soundOn')}
-            className="p-2 rounded-2xl hover:bg-white/5 text-zinc-500 hover:text-zinc-300 transition-colors"
+            className="p-2 rounded-2xl hover:bg-[var(--pc-hover)] text-pc-text-muted hover:text-pc-text transition-colors"
             title={soundEnabled ? t('header.soundOff') : t('header.soundOn')}
           >
             {soundEnabled ? <Volume2 size={16} /> : <VolumeOff size={16} />}
@@ -71,7 +71,7 @@ export function Header({ status, sessionKey, onToggleSidebar, activeSessionData,
           <button
             onClick={handleExport}
             aria-label={t('header.export')}
-            className="p-2 rounded-2xl hover:bg-white/5 text-zinc-500 hover:text-zinc-300 transition-colors"
+            className="p-2 rounded-2xl hover:bg-[var(--pc-hover)] text-pc-text-muted hover:text-pc-text transition-colors"
             title={t('header.export')}
           >
             <Download size={16} />
@@ -80,26 +80,26 @@ export function Header({ status, sessionKey, onToggleSidebar, activeSessionData,
         <ThemeSwitcher />
         <LanguageSelector />
         {status === 'connected' ? (
-          <div className="flex items-center gap-2 rounded-2xl border border-white/8 bg-zinc-800/30 px-3 py-1.5">
-            <span className="w-2 h-2 rounded-full bg-cyan-300/80 shadow-[0_0_12px_rgba(34,211,238,0.6)]" />
-            <span className="text-xs text-zinc-300 hidden sm:inline">{t('header.connected')}</span>
+          <div className="flex items-center gap-2 rounded-2xl border border-pc-border bg-pc-elevated/30 px-3 py-1.5">
+            <span className="w-2 h-2 rounded-full bg-[var(--pc-accent)] shadow-[0_0_12px_var(--pc-accent-dim)]" />
+            <span className="text-xs text-pc-text hidden sm:inline">{t('header.connected')}</span>
           </div>
         ) : status === 'connecting' ? (
-          <div className="flex items-center gap-2 rounded-2xl border border-white/8 bg-zinc-800/30 px-3 py-1.5">
+          <div className="flex items-center gap-2 rounded-2xl border border-pc-border bg-pc-elevated/30 px-3 py-1.5">
             <span className="w-2 h-2 rounded-full bg-yellow-400/80 pulse-dot" />
-            <span className="text-xs text-zinc-300 hidden sm:inline">{t('login.connecting')}</span>
+            <span className="text-xs text-pc-text hidden sm:inline">{t('login.connecting')}</span>
           </div>
         ) : (
-          <div className="flex items-center gap-2 rounded-2xl border border-white/8 bg-zinc-800/30 px-3 py-1.5">
+          <div className="flex items-center gap-2 rounded-2xl border border-pc-border bg-pc-elevated/30 px-3 py-1.5">
             <span className="w-2 h-2 rounded-full bg-red-400/80" />
-            <span className="text-xs text-zinc-300 hidden sm:inline">{t('header.disconnected')}</span>
+            <span className="text-xs text-pc-text hidden sm:inline">{t('header.disconnected')}</span>
           </div>
         )}
         {onLogout && (
           <button
             onClick={onLogout}
             aria-label={t('header.logout')}
-            className="p-2 rounded-2xl hover:bg-white/5 text-zinc-500 hover:text-zinc-300 transition-colors"
+            className="p-2 rounded-2xl hover:bg-[var(--pc-hover)] text-pc-text-muted hover:text-pc-text transition-colors"
             title={t('header.logout')}
           >
             <LogOut size={16} />
@@ -115,17 +115,17 @@ export function Header({ status, sessionKey, onToggleSidebar, activeSessionData,
         const opacity = Math.max(0.35, Math.min(1, pct / 100));
         const barStyle = { width: `${pct}%`, backgroundColor: `rgba(56, 189, 248, ${opacity})` };
         return (
-          <div className="px-4 py-1.5 bg-[var(--pc-bg-surface)]/60 border-b border-white/8 flex items-center gap-3">
+          <div className="px-4 py-1.5 bg-[var(--pc-bg-surface)]/60 border-b border-pc-border flex items-center gap-3">
             {activeSessionData?.model && (
-              <span className="inline-flex items-center gap-1 text-[10px] text-zinc-500 shrink-0" title={`Model: ${activeSessionData.model}${activeSessionData.agentId ? ` · Agent: ${activeSessionData.agentId}` : ''}`}>
+              <span className="inline-flex items-center gap-1 text-[10px] text-pc-text-muted shrink-0" title={`Model: ${activeSessionData.model}${activeSessionData.agentId ? ` · Agent: ${activeSessionData.agentId}` : ''}`}>
                 <Cpu className="h-2.5 w-2.5" />
                 <span className="truncate max-w-[120px]">{activeSessionData.model.replace(/^.*\//, '')}</span>
               </span>
             )}
-            <div className="flex-1 h-[5px] rounded-full bg-white/5 overflow-hidden">
+            <div className="flex-1 h-[5px] rounded-full bg-[var(--pc-hover)] overflow-hidden">
               <div className="h-full rounded-full transition-all duration-500" style={barStyle} />
             </div>
-            <span className="text-[11px] text-zinc-400 tabular-nums shrink-0 whitespace-nowrap">
+            <span className="text-[11px] text-pc-text-secondary tabular-nums shrink-0 whitespace-nowrap">
               {(total / 1000).toFixed(1)}k / {(ctx / 1000).toFixed(0)}k tokens
             </span>
           </div>
diff --git a/src/components/ImageBlock.tsx b/src/components/ImageBlock.tsx
index 2044261..f6636a2 100644
--- a/src/components/ImageBlock.tsx
+++ b/src/components/ImageBlock.tsx
@@ -27,7 +27,7 @@ function Lightbox({ src, alt, onClose }: ImageBlockProps & { onClose: () => void
       <button
         onClick={onClose}
         aria-label="Close preview"
-        className="absolute top-4 right-4 p-2 rounded-full bg-zinc-800/80 border border-white/10 text-zinc-300 hover:text-white hover:bg-zinc-700/80 transition-colors"
+        className="absolute top-4 right-4 p-2 rounded-full bg-pc-elevated/80 border border-pc-border-strong text-pc-text hover:text-white hover:bg-pc-elevated/80 transition-colors"
       >
         <X size={20} />
       </button>
@@ -51,7 +51,7 @@ export function ImageBlock({ src, alt }: ImageBlockProps) {
           type="button"
           onClick={() => setLightbox(true)}
           aria-label={`View ${alt || 'image'} full size`}
-          className="block rounded-xl border border-white/8 cursor-pointer hover:brightness-110 transition-all focus:outline-none focus:ring-2 focus:ring-cyan-400/40"
+          className="block rounded-xl border border-pc-border cursor-pointer hover:brightness-110 transition-all focus:outline-none focus:ring-2 focus:ring-[var(--pc-accent-dim)]"
         >
           <img
             src={src}
diff --git a/src/components/KeyboardShortcuts.tsx b/src/components/KeyboardShortcuts.tsx
index 19f1d41..f4a34a8 100644
--- a/src/components/KeyboardShortcuts.tsx
+++ b/src/components/KeyboardShortcuts.tsx
@@ -9,7 +9,7 @@ interface Props {
 
 function Kbd({ children }: { children: React.ReactNode }) {
   return (
-    <kbd className="inline-flex items-center justify-center min-w-[1.75rem] h-7 px-2 rounded-lg border border-white/10 bg-zinc-800/80 text-xs font-mono text-zinc-300 shadow-[0_1px_0_0_rgba(255,255,255,0.05)]">
+    <kbd className="inline-flex items-center justify-center min-w-[1.75rem] h-7 px-2 rounded-lg border border-pc-border-strong bg-pc-elevated/80 text-xs font-mono text-pc-text shadow-[0_1px_0_0_rgba(255,255,255,0.05)]">
       {children}
     </kbd>
   );
@@ -18,7 +18,7 @@ function Kbd({ children }: { children: React.ReactNode }) {
 function ShortcutRow({ keys, label }: { keys: React.ReactNode; label: string }) {
   return (
     <div className="flex items-center justify-between py-2">
-      <span className="text-sm text-zinc-400">{label}</span>
+      <span className="text-sm text-pc-text-secondary">{label}</span>
       <div className="flex items-center gap-1.5">{keys}</div>
     </div>
   );
@@ -26,7 +26,7 @@ function ShortcutRow({ keys, label }: { keys: React.ReactNode; label: string })
 
 function SectionTitle({ children }: { children: React.ReactNode }) {
   return (
-    <div className="text-[11px] uppercase tracking-wider text-zinc-500 font-semibold mt-4 mb-1 first:mt-0">
+    <div className="text-[11px] uppercase tracking-wider text-pc-text-muted font-semibold mt-4 mb-1 first:mt-0">
       {children}
     </div>
   );
@@ -56,18 +56,18 @@ export function KeyboardShortcuts({ open, onClose }: Props) {
 
       {/* Modal */}
       <div
-        className="relative w-full max-w-md mx-4 rounded-3xl border border-white/8 bg-[var(--pc-bg-base)]/95 backdrop-blur-xl shadow-2xl animate-fade-in"
+        className="relative w-full max-w-md mx-4 rounded-3xl border border-pc-border bg-[var(--pc-bg-base)]/95 backdrop-blur-xl shadow-2xl animate-fade-in"
         onClick={(e) => e.stopPropagation()}
       >
         {/* Header */}
-        <div className="flex items-center justify-between px-6 py-4 border-b border-white/8">
+        <div className="flex items-center justify-between px-6 py-4 border-b border-pc-border">
           <div className="flex items-center gap-2.5">
-            <Keyboard size={18} className="text-cyan-300/70" />
-            <h2 className="text-sm font-semibold text-zinc-200">{t('shortcuts.title')}</h2>
+            <Keyboard size={18} className="text-pc-accent-light/70" />
+            <h2 className="text-sm font-semibold text-pc-text">{t('shortcuts.title')}</h2>
           </div>
           <button
             onClick={onClose}
-            className="h-8 w-8 rounded-xl flex items-center justify-center text-zinc-500 hover:text-zinc-300 hover:bg-white/5 transition-colors"
+            className="h-8 w-8 rounded-xl flex items-center justify-center text-pc-text-muted hover:text-pc-text hover:bg-[var(--pc-hover)] transition-colors"
             aria-label={t('shortcuts.close')}
           >
             <X size={16} />
@@ -83,7 +83,7 @@ export function KeyboardShortcuts({ open, onClose }: Props) {
               label={t('shortcuts.send')}
             />
             <ShortcutRow
-              keys={<><Kbd>Shift</Kbd><span className="text-zinc-600">+</span><Kbd>Enter</Kbd></>}
+              keys={<><Kbd>Shift</Kbd><span className="text-pc-text-faint">+</span><Kbd>Enter</Kbd></>}
               label={t('shortcuts.newline')}
             />
             <ShortcutRow
@@ -95,11 +95,11 @@ export function KeyboardShortcuts({ open, onClose }: Props) {
           <div className="py-3">
             <SectionTitle>{t('shortcuts.navigationSection')}</SectionTitle>
             <ShortcutRow
-              keys={<><Kbd>{mod}</Kbd><span className="text-zinc-600">+</span><Kbd>K</Kbd></>}
+              keys={<><Kbd>{mod}</Kbd><span className="text-pc-text-faint">+</span><Kbd>K</Kbd></>}
               label={t('shortcuts.search')}
             />
             <ShortcutRow
-              keys={<><Kbd>Alt</Kbd><span className="text-zinc-600">+</span><Kbd>↑</Kbd><span className="text-zinc-600">/</span><Kbd>↓</Kbd></>}
+              keys={<><Kbd>Alt</Kbd><span className="text-pc-text-faint">+</span><Kbd>↑</Kbd><span className="text-pc-text-faint">/</span><Kbd>↓</Kbd></>}
               label={t('shortcuts.switchSession')}
             />
             <ShortcutRow
diff --git a/src/components/LanguageSelector.tsx b/src/components/LanguageSelector.tsx
index 5271173..a75051a 100644
--- a/src/components/LanguageSelector.tsx
+++ b/src/components/LanguageSelector.tsx
@@ -14,7 +14,7 @@ export function LanguageSelector() {
   return (
     <button
       onClick={cycle}
-      className="flex items-center gap-1.5 rounded-2xl border border-white/8 bg-zinc-800/30 px-2.5 py-1.5 text-xs text-zinc-400 hover:text-zinc-200 hover:bg-white/5 transition-colors"
+      className="flex items-center gap-1.5 rounded-2xl border border-pc-border bg-pc-elevated/30 px-2.5 py-1.5 text-xs text-pc-text-secondary hover:text-pc-text hover:bg-[var(--pc-hover)] transition-colors"
       title="Change language"
       aria-label={`Language: ${localeLabels[current] || current}. Click to change.`}
     >
diff --git a/src/components/LoginScreen.tsx b/src/components/LoginScreen.tsx
index 26babad..0119731 100644
--- a/src/components/LoginScreen.tsx
+++ b/src/components/LoginScreen.tsx
@@ -37,22 +37,22 @@ export function LoginScreen({ onConnect, error, isConnecting }: Props) {
   };
 
   return (
-    <div className="h-dvh flex items-center justify-center bg-[var(--pc-bg-base)] text-zinc-300 bg-[radial-gradient(ellipse_at_top,rgba(255,255,255,0.02),transparent_50%),radial-gradient(ellipse_at_bottom_right,rgba(99,102,241,0.04),transparent_50%)]">
+    <div className="h-dvh flex items-center justify-center bg-[var(--pc-bg-base)] text-pc-text bg-[radial-gradient(ellipse_at_top,rgba(255,255,255,0.02),transparent_50%),radial-gradient(ellipse_at_bottom_right,rgba(99,102,241,0.04),transparent_50%)]">
       <div className="w-full max-w-md mx-4">
         {/* Logo */}
         <div className="flex flex-col items-center gap-3 mb-8">
           <img src="/logo.png" alt="PinchChat" className="h-20 w-20 drop-shadow-lg" />
           <div className="flex items-center gap-2">
-            <h1 className="text-2xl font-bold text-zinc-200 tracking-wide">{t('login.title')}</h1>
-            <Sparkles className="h-5 w-5 text-cyan-300/60" />
+            <h1 className="text-2xl font-bold text-pc-text tracking-wide">{t('login.title')}</h1>
+            <Sparkles className="h-5 w-5 text-pc-accent-light/60" />
           </div>
-          <p className="text-sm text-zinc-500">{t('login.subtitle')}</p>
+          <p className="text-sm text-pc-text-muted">{t('login.subtitle')}</p>
         </div>
 
         {/* Form */}
-        <form onSubmit={handleSubmit} className="rounded-2xl border border-white/8 bg-[var(--pc-bg-surface)]/80 backdrop-blur-xl p-6 space-y-5 shadow-2xl shadow-black/30">
+        <form onSubmit={handleSubmit} className="rounded-2xl border border-pc-border bg-[var(--pc-bg-surface)]/80 backdrop-blur-xl p-6 space-y-5 shadow-2xl shadow-black/30">
           <div className="space-y-2">
-            <label htmlFor="gateway-url" className="block text-xs font-medium text-zinc-400 uppercase tracking-wider">
+            <label htmlFor="gateway-url" className="block text-xs font-medium text-pc-text-secondary uppercase tracking-wider">
               {t('login.gatewayUrl')}
             </label>
             <input
@@ -61,7 +61,7 @@ export function LoginScreen({ onConnect, error, isConnecting }: Props) {
               value={url}
               onChange={e => setUrl(e.target.value)}
               placeholder="ws://192.168.1.14:18789"
-              className="w-full rounded-xl border border-white/8 bg-zinc-800/50 px-4 py-3 text-sm text-zinc-200 placeholder:text-zinc-600 outline-none focus:border-cyan-400/40 focus:ring-1 focus:ring-cyan-400/20 transition-all"
+              className="w-full rounded-xl border border-pc-border bg-pc-elevated/50 px-4 py-3 text-sm text-pc-text placeholder:text-pc-text-faint outline-none focus:border-[var(--pc-accent-dim)] focus:ring-1 focus:ring-[var(--pc-accent-glow)] transition-all"
               autoComplete="url"
               disabled={isConnecting}
             />
@@ -73,7 +73,7 @@ export function LoginScreen({ onConnect, error, isConnecting }: Props) {
           </div>
 
           <div className="space-y-2">
-            <label htmlFor="gateway-token" className="block text-xs font-medium text-zinc-400 uppercase tracking-wider">
+            <label htmlFor="gateway-token" className="block text-xs font-medium text-pc-text-secondary uppercase tracking-wider">
               {t('login.token')}
             </label>
             <div className="relative">
@@ -83,14 +83,14 @@ export function LoginScreen({ onConnect, error, isConnecting }: Props) {
                 value={token}
                 onChange={e => setToken(e.target.value)}
                 placeholder={t('login.tokenPlaceholder')}
-                className="w-full rounded-xl border border-white/8 bg-zinc-800/50 px-4 py-3 pr-12 text-sm text-zinc-200 placeholder:text-zinc-600 outline-none focus:border-cyan-400/40 focus:ring-1 focus:ring-cyan-400/20 transition-all"
+                className="w-full rounded-xl border border-pc-border bg-pc-elevated/50 px-4 py-3 pr-12 text-sm text-pc-text placeholder:text-pc-text-faint outline-none focus:border-[var(--pc-accent-dim)] focus:ring-1 focus:ring-[var(--pc-accent-glow)] transition-all"
                 autoComplete="current-password"
                 disabled={isConnecting}
               />
               <button
                 type="button"
                 onClick={() => setShowToken(!showToken)}
-                className="absolute right-3 top-1/2 -translate-y-1/2 text-zinc-500 hover:text-zinc-300 transition-colors"
+                className="absolute right-3 top-1/2 -translate-y-1/2 text-pc-text-muted hover:text-pc-text transition-colors"
                 tabIndex={-1}
                 aria-label={showToken ? t('login.hideToken') : t('login.showToken')}
               >
@@ -121,7 +121,7 @@ export function LoginScreen({ onConnect, error, isConnecting }: Props) {
           </button>
         </form>
 
-        <p className="text-center text-xs text-zinc-600 mt-6">
+        <p className="text-center text-xs text-pc-text-faint mt-6">
           {t('login.storedLocally')}
         </p>
       </div>
diff --git a/src/components/SessionIcon.tsx b/src/components/SessionIcon.tsx
index 9bc2230..30880cb 100644
--- a/src/components/SessionIcon.tsx
+++ b/src/components/SessionIcon.tsx
@@ -52,7 +52,7 @@ export function SessionIcon({ session, isActive, isCurrentSession }: {
   isCurrentSession?: boolean;
 }) {
   const size = 15;
-  const baseClass = isCurrentSession ? 'text-cyan-300/70' : isActive ? 'text-violet-400/70' : '';
+  const baseClass = isCurrentSession ? 'text-pc-accent-light/70' : isActive ? 'text-violet-400/70' : '';
 
   // Detect cron sessions from key pattern
   const isCron = session.key.includes(':cron:');
diff --git a/src/components/Sidebar.tsx b/src/components/Sidebar.tsx
index 40d19f7..d89cbb9 100644
--- a/src/components/Sidebar.tsx
+++ b/src/components/Sidebar.tsx
@@ -142,18 +142,18 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
   return (
     <>
       {open && <div className="fixed inset-0 bg-black/60 backdrop-blur-sm z-40 lg:hidden" onClick={onClose} />}
-      <aside role="navigation" aria-label="Sessions" className={`fixed lg:relative top-0 left-0 h-full bg-[var(--pc-bg-base)]/95 border-r border-white/8 z-50 transform ${dragging ? '' : 'transition-transform'} lg:translate-x-0 ${open ? 'translate-x-0' : '-translate-x-full'} flex flex-col backdrop-blur-xl`} style={{ width: `${width}px` }}>
-        <div className="h-14 flex items-center justify-between px-4 border-b border-white/8">
+      <aside role="navigation" aria-label="Sessions" className={`fixed lg:relative top-0 left-0 h-full bg-[var(--pc-bg-base)]/95 border-r border-pc-border z-50 transform ${dragging ? '' : 'transition-transform'} lg:translate-x-0 ${open ? 'translate-x-0' : '-translate-x-full'} flex flex-col backdrop-blur-xl`} style={{ width: `${width}px` }}>
+        <div className="h-14 flex items-center justify-between px-4 border-b border-pc-border">
           <div className="flex items-center gap-2">
             <div className="relative">
               <div className="absolute -inset-1.5 rounded-xl bg-gradient-to-r from-cyan-400/15 to-violet-500/15 blur-lg" />
-              <div className="relative flex h-8 w-8 items-center justify-center rounded-xl border border-white/8 bg-zinc-800/50">
-                <Sparkles className="h-4 w-4 text-cyan-200" />
+              <div className="relative flex h-8 w-8 items-center justify-center rounded-xl border border-pc-border bg-pc-elevated/50">
+                <Sparkles className="h-4 w-4 text-pc-accent-light" />
               </div>
             </div>
-            <span className="font-semibold text-sm text-zinc-200 tracking-wide">{t('sidebar.title')}</span>
+            <span className="font-semibold text-sm text-pc-text tracking-wide">{t('sidebar.title')}</span>
           </div>
-          <button onClick={onClose} className="lg:hidden p-1.5 rounded-xl hover:bg-white/5 text-zinc-400 transition-colors">
+          <button onClick={onClose} className="lg:hidden p-1.5 rounded-xl hover:bg-[var(--pc-hover)] text-pc-text-secondary transition-colors">
             <X size={16} />
           </button>
         </div>
@@ -162,7 +162,7 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
         {sessions.length > 3 && (
           <div className="px-2 pt-2">
             <div className="relative">
-              <Search size={14} className="absolute left-3 top-1/2 -translate-y-1/2 text-zinc-500" />
+              <Search size={14} className="absolute left-3 top-1/2 -translate-y-1/2 text-pc-text-muted" />
               <input
                 ref={searchRef}
                 type="text"
@@ -170,12 +170,12 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
                 onChange={e => updateFilter(e.target.value)}
                 placeholder={t('sidebar.search')}
                 aria-label={t('sidebar.search')}
-                className="w-full pl-8 pr-3 py-1.5 rounded-xl border border-white/8 bg-zinc-800/30 text-xs text-zinc-300 placeholder:text-zinc-500 outline-none focus:ring-1 focus:ring-cyan-400/30 transition-all"
+                className="w-full pl-8 pr-3 py-1.5 rounded-xl border border-pc-border bg-pc-elevated/30 text-xs text-pc-text placeholder:text-pc-text-muted outline-none focus:ring-1 focus:ring-[var(--pc-accent-dim)] transition-all"
               />
               {filter && (
                 <button
                   onClick={() => updateFilter('')}
-                  className="absolute right-2 top-1/2 -translate-y-1/2 text-zinc-500 hover:text-zinc-300"
+                  className="absolute right-2 top-1/2 -translate-y-1/2 text-pc-text-muted hover:text-pc-text"
                 >
                   <X size={12} />
                 </button>
@@ -214,10 +214,10 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
           }}
         >
           {sessions.length === 0 && (
-            <div className="px-3 py-8 text-center text-zinc-500 text-sm">{t('sidebar.empty')}</div>
+            <div className="px-3 py-8 text-center text-pc-text-muted text-sm">{t('sidebar.empty')}</div>
           )}
           {sessions.length > 0 && filtered.length === 0 && (
-            <div className="px-3 py-6 text-center text-zinc-500 text-xs">{t('sidebar.noResults')}</div>
+            <div className="px-3 py-6 text-center text-pc-text-muted text-xs">{t('sidebar.noResults')}</div>
           )}
           {filtered.map((s, idx) => {
             const isActive = s.key === activeSession;
@@ -228,7 +228,7 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
               <div key={s.key}>
                 {isFirstUnpinned && (
                   <div className="flex items-center gap-2 px-3 py-1.5 mt-1 mb-1">
-                    <div className="flex-1 h-px bg-white/5" />
+                    <div className="flex-1 h-px bg-[var(--pc-hover)]" />
                   </div>
                 )}
                 <button
@@ -238,11 +238,11 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
                   onMouseEnter={() => setFocusIdx(idx)}
                   className={`group/item w-full flex items-center gap-3 px-3 py-2.5 rounded-2xl text-left text-sm transition-all mb-1 ${
                     isActive
-                      ? 'bg-white/5 text-cyan-200 border border-white/8 shadow-[0_0_12px_rgba(34,211,238,0.08)]'
+                      ? 'bg-[var(--pc-hover)] text-pc-accent-light border border-pc-border shadow-[0_0_12px_rgba(34,211,238,0.08)]'
                       : s.isActive
                         ? 'bg-violet-500/5 text-violet-200 border border-violet-500/15 shadow-[0_0_10px_rgba(168,85,247,0.06)]'
-                        : 'text-zinc-400 hover:bg-white/5 border border-transparent'
-                  } ${isFocused && !isActive ? 'ring-1 ring-cyan-400/30' : ''}`}
+                        : 'text-pc-text-secondary hover:bg-[var(--pc-hover)] border border-transparent'
+                  } ${isFocused && !isActive ? 'ring-1 ring-[var(--pc-accent-dim)]' : ''}`}
                 >
                   <div className="relative">
                     <SessionIcon session={s} isActive={s.isActive} isCurrentSession={isActive} />
@@ -250,7 +250,7 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
                       <span className="absolute -top-0.5 -right-0.5 h-2 w-2 rounded-full bg-violet-400 shadow-[0_0_8px_rgba(168,85,247,0.7)] animate-pulse" />
                     )}
                     {s.hasUnread && !isActive && (
-                      <span className="absolute -top-0.5 -left-0.5 h-2 w-2 rounded-full bg-cyan-400 shadow-[0_0_8px_rgba(34,211,238,0.7)]" />
+                      <span className="absolute -top-0.5 -left-0.5 h-2 w-2 rounded-full bg-[var(--pc-accent)] shadow-[0_0_8px_rgba(34,211,238,0.7)]" />
                     )}
                   </div>
                   <div className="flex-1 min-w-0">
@@ -258,14 +258,14 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
                       <span className="flex-1 truncate">{sessionDisplayName(s)}</span>
                       {(() => {
                         const rel = relativeTime(s.updatedAt);
-                        return rel ? <span className="text-[10px] text-zinc-500 tabular-nums shrink-0">{rel}</span> : null;
+                        return rel ? <span className="text-[10px] text-pc-text-muted tabular-nums shrink-0">{rel}</span> : null;
                       })()}
                       <button
                         onClick={(e) => togglePin(s.key, e)}
                         className={`shrink-0 p-0.5 rounded-lg transition-all ${
                           isPinned
-                            ? 'text-cyan-400 opacity-80 hover:opacity-100'
-                            : 'text-zinc-600 opacity-0 group-hover/item:opacity-60 hover:!opacity-100 hover:text-zinc-400'
+                            ? 'text-pc-accent opacity-80 hover:opacity-100'
+                            : 'text-pc-text-faint opacity-0 group-hover/item:opacity-60 hover:!opacity-100 hover:text-pc-text-secondary'
                         }`}
                         title={isPinned ? t('sidebar.unpin') : t('sidebar.pin')}
                         aria-label={isPinned ? t('sidebar.unpin') : t('sidebar.pin')}
@@ -274,20 +274,20 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
                       </button>
                       <button
                         onClick={(e) => { e.stopPropagation(); setConfirmDelete(s.key); }}
-                        className="shrink-0 p-0.5 rounded-lg transition-all text-zinc-600 opacity-0 group-hover/item:opacity-60 hover:!opacity-100 hover:text-red-400"
+                        className="shrink-0 p-0.5 rounded-lg transition-all text-pc-text-faint opacity-0 group-hover/item:opacity-60 hover:!opacity-100 hover:text-red-400"
                         title={t('sidebar.delete')}
                         aria-label={t('sidebar.delete')}
                       >
                         <Trash2 size={12} />
                       </button>
                       {s.messageCount != null && (
-                        <span className={`text-[11px] px-2 py-0.5 rounded-full shrink-0 ${isActive ? 'bg-cyan-400/10 text-cyan-300' : 'bg-white/5 text-zinc-500'}`}>
+                        <span className={`text-[11px] px-2 py-0.5 rounded-full shrink-0 ${isActive ? 'bg-[var(--pc-accent-glow)] text-pc-accent-light' : 'bg-[var(--pc-hover)] text-pc-text-muted'}`}>
                           {s.messageCount}
                         </span>
                       )}
                     </div>
                     {s.lastMessagePreview && (
-                      <p className="text-[11px] text-zinc-500 truncate mt-0.5 leading-tight">{s.lastMessagePreview.replace(/\s+/g, ' ').slice(0, 80)}</p>
+                      <p className="text-[11px] text-pc-text-muted truncate mt-0.5 leading-tight">{s.lastMessagePreview.replace(/\s+/g, ' ').slice(0, 80)}</p>
                     )}
                     {(() => {
                       if (!s.contextTokens) return null;
@@ -296,10 +296,10 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
                       const barStyle = { width: `${pct}%`, backgroundColor: `rgba(56, 189, 248, ${barOpacity})` };
                       return (
                         <div className="flex items-center gap-1.5 mt-1">
-                          <div className="flex-1 h-[3px] rounded-full bg-white/5 overflow-hidden">
+                          <div className="flex-1 h-[3px] rounded-full bg-[var(--pc-hover)] overflow-hidden">
                             <div className="h-full rounded-full" style={barStyle} />
                           </div>
-                          <span className="text-[9px] text-zinc-500 tabular-nums shrink-0">{Math.round(pct)}%</span>
+                          <span className="text-[9px] text-pc-text-muted tabular-nums shrink-0">{Math.round(pct)}%</span>
                         </div>
                       );
                     })()}
@@ -310,17 +310,17 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
           })}
         </div>
         {/* Footer with version */}
-        <div className="px-4 py-3 border-t border-white/8 flex items-center justify-center gap-2">
+        <div className="px-4 py-3 border-t border-pc-border flex items-center justify-center gap-2">
           <span className="h-1.5 w-1.5 rounded-full bg-violet-300/60 shadow-[0_0_10px_rgba(168,85,247,0.5)]" />
-          <span className="h-1.5 w-1.5 rounded-full bg-cyan-300/60 shadow-[0_0_10px_rgba(34,211,238,0.5)]" />
+          <span className="h-1.5 w-1.5 rounded-full bg-[var(--pc-accent-dim)] shadow-[0_0_10px_rgba(34,211,238,0.5)]" />
           <span className="h-1.5 w-1.5 rounded-full bg-indigo-300/50 shadow-[0_0_10px_rgba(99,102,241,0.4)]" />
-          <span className="ml-1 text-[9px] text-zinc-600 select-all" title={`PinchChat v${__APP_VERSION__}`}>v{__APP_VERSION__}</span>
+          <span className="ml-1 text-[9px] text-pc-text-faint select-all" title={`PinchChat v${__APP_VERSION__}`}>v{__APP_VERSION__}</span>
         </div>
         {/* Resize drag handle */}
         <div
           onMouseDown={startDrag}
           onTouchStart={startDrag}
-          className={`hidden lg:block absolute top-0 right-0 w-1.5 h-full cursor-col-resize group/resize z-10 ${dragging ? 'bg-cyan-400/20' : 'hover:bg-cyan-400/15'} transition-colors`}
+          className={`hidden lg:block absolute top-0 right-0 w-1.5 h-full cursor-col-resize group/resize z-10 ${dragging ? 'bg-[var(--pc-accent-glow)]' : 'hover:bg-[var(--pc-accent-glow)]'} transition-colors`}
           role="separator"
           aria-orientation="vertical"
           aria-label="Resize sidebar"
@@ -328,7 +328,7 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
           aria-valuemin={MIN_WIDTH}
           aria-valuemax={MAX_WIDTH}
         >
-          <div className={`absolute top-1/2 -translate-y-1/2 right-0 w-0.5 h-8 rounded-full ${dragging ? 'bg-cyan-400/50' : 'bg-white/0 group-hover/resize:bg-cyan-400/30'} transition-colors`} />
+          <div className={`absolute top-1/2 -translate-y-1/2 right-0 w-0.5 h-8 rounded-full ${dragging ? 'bg-[var(--pc-accent-dim)]' : 'bg-transparent group-hover/resize:bg-[var(--pc-accent-dim)]'} transition-colors`} />
         </div>
       </aside>
       {/* Prevent text selection while dragging */}
@@ -337,12 +337,12 @@ export function Sidebar({ sessions, activeSession, onSwitch, onDelete, open, onC
       {confirmDelete && (
         <>
           <div className="fixed inset-0 bg-black/60 backdrop-blur-sm z-[70]" onClick={() => setConfirmDelete(null)} />
-          <div className="fixed top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 z-[80] w-72 bg-[var(--pc-bg-base)] border border-white/10 rounded-2xl p-5 shadow-2xl">
-            <p className="text-sm text-zinc-300 mb-4">{t('sidebar.deleteConfirm')}</p>
+          <div className="fixed top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 z-[80] w-72 bg-[var(--pc-bg-base)] border border-pc-border-strong rounded-2xl p-5 shadow-2xl">
+            <p className="text-sm text-pc-text mb-4">{t('sidebar.deleteConfirm')}</p>
             <div className="flex gap-2 justify-end">
               <button
                 onClick={() => setConfirmDelete(null)}
-                className="px-3 py-1.5 text-xs rounded-xl border border-white/10 text-zinc-400 hover:bg-white/5 transition-colors"
+                className="px-3 py-1.5 text-xs rounded-xl border border-pc-border-strong text-pc-text-secondary hover:bg-[var(--pc-hover)] transition-colors"
               >
                 {t('sidebar.deleteCancel')}
               </button>
diff --git a/src/components/ThinkingBlock.tsx b/src/components/ThinkingBlock.tsx
index e51d72c..ae754cc 100644
--- a/src/components/ThinkingBlock.tsx
+++ b/src/components/ThinkingBlock.tsx
@@ -10,14 +10,14 @@ export function ThinkingBlock({ text }: { text: string }) {
     <div className="my-2">
       <button
         onClick={() => setOpen(!open)}
-        className="inline-flex items-center gap-1.5 rounded-2xl border border-white/8 bg-zinc-800/35 px-3 py-1.5 text-xs text-violet-300 hover:bg-white/5 transition-colors"
+        className="inline-flex items-center gap-1.5 rounded-2xl border border-pc-border bg-pc-elevated/35 px-3 py-1.5 text-xs text-violet-300 hover:bg-[var(--pc-hover)] transition-colors"
       >
         <Brain size={13} />
         <span className="font-medium">{t('thinking.label')}</span>
-        {open ? <ChevronDown size={12} className="ml-1 text-zinc-500" /> : <ChevronRight size={12} className="ml-1 text-zinc-500" />}
+        {open ? <ChevronDown size={12} className="ml-1 text-pc-text-muted" /> : <ChevronRight size={12} className="ml-1 text-pc-text-muted" />}
       </button>
       {open && (
-        <div className="mt-2 rounded-2xl border border-white/8 bg-zinc-800/25 p-3 text-sm italic text-zinc-400 whitespace-pre-wrap max-h-96 overflow-y-auto">
+        <div className="mt-2 rounded-2xl border border-pc-border bg-pc-elevated/25 p-3 text-sm italic text-pc-text-secondary whitespace-pre-wrap max-h-96 overflow-y-auto">
           {text}
         </div>
       )}
diff --git a/src/components/ToolCall.tsx b/src/components/ToolCall.tsx
index 837819c..b1ac34f 100644
--- a/src/components/ToolCall.tsx
+++ b/src/components/ToolCall.tsx
@@ -17,7 +17,7 @@ const toolColors: Record<string, ToolColor> = {
   write:      { border: 'border-violet-500/30', bg: 'bg-violet-500/10', text: 'text-violet-300', icon: 'text-violet-400', glow: 'shadow-[0_0_8px_rgba(139,92,246,0.15)]', expandBorder: 'border-violet-500/20', expandBg: 'bg-violet-950/20' },
   Edit:       { border: 'border-violet-500/30', bg: 'bg-violet-500/10', text: 'text-violet-300', icon: 'text-violet-400', glow: 'shadow-[0_0_8px_rgba(139,92,246,0.15)]', expandBorder: 'border-violet-500/20', expandBg: 'bg-violet-950/20' },
   edit:       { border: 'border-violet-500/30', bg: 'bg-violet-500/10', text: 'text-violet-300', icon: 'text-violet-400', glow: 'shadow-[0_0_8px_rgba(139,92,246,0.15)]', expandBorder: 'border-violet-500/20', expandBg: 'bg-violet-950/20' },
-  browser:    { border: 'border-cyan-500/30', bg: 'bg-cyan-500/10', text: 'text-cyan-300', icon: 'text-cyan-400', glow: 'shadow-[0_0_8px_rgba(6,182,212,0.15)]', expandBorder: 'border-cyan-500/20', expandBg: 'bg-cyan-950/20' },
+  browser:    { border: 'border-cyan-500/30', bg: 'bg-cyan-500/10', text: 'text-pc-accent-light', icon: 'text-pc-accent', glow: 'shadow-[0_0_8px_rgba(6,182,212,0.15)]', expandBorder: 'border-cyan-500/20', expandBg: 'bg-cyan-950/20' },
   image:      { border: 'border-pink-500/30', bg: 'bg-pink-500/10', text: 'text-pink-300', icon: 'text-pink-400', glow: 'shadow-[0_0_8px_rgba(236,72,153,0.15)]', expandBorder: 'border-pink-500/20', expandBg: 'bg-pink-950/20' },
   message:    { border: 'border-indigo-500/30', bg: 'bg-indigo-500/10', text: 'text-indigo-300', icon: 'text-indigo-400', glow: 'shadow-[0_0_8px_rgba(99,102,241,0.15)]', expandBorder: 'border-indigo-500/20', expandBg: 'bg-indigo-950/20' },
   memory_search: { border: 'border-rose-500/30', bg: 'bg-rose-500/10', text: 'text-rose-300', icon: 'text-rose-400', glow: 'shadow-[0_0_8px_rgba(244,63,94,0.15)]', expandBorder: 'border-rose-500/20', expandBg: 'bg-rose-950/20' },
@@ -26,7 +26,7 @@ const toolColors: Record<string, ToolColor> = {
   sessions_spawn: { border: 'border-teal-500/30', bg: 'bg-teal-500/10', text: 'text-teal-300', icon: 'text-teal-400', glow: 'shadow-[0_0_8px_rgba(20,184,166,0.15)]', expandBorder: 'border-teal-500/20', expandBg: 'bg-teal-950/20' },
 };
 
-const defaultColor: ToolColor = { border: 'border-zinc-500/30', bg: 'bg-zinc-500/10', text: 'text-zinc-300', icon: 'text-zinc-400', glow: 'shadow-[0_0_8px_rgba(161,161,170,0.1)]', expandBorder: 'border-zinc-500/20', expandBg: 'bg-zinc-800/25' };
+const defaultColor: ToolColor = { border: 'border-pc-border-strong', bg: 'bg-pc-elevated/10', text: 'text-pc-text', icon: 'text-pc-text-secondary', glow: 'shadow-[0_0_8px_rgba(161,161,170,0.1)]', expandBorder: 'border-pc-border', expandBg: 'bg-pc-elevated/25' };
 
 function getColor(name: string): ToolColor {
   return toolColors[name] || defaultColor;
@@ -115,7 +115,7 @@ function WrapToggle({ wrap, onToggle }: { wrap: boolean; onToggle: () => void })
   return (
     <button
       onClick={onToggle}
-      className="absolute top-2 right-8 p-1 rounded-lg bg-zinc-700/60 hover:bg-zinc-600/80 border border-white/10 text-zinc-400 hover:text-zinc-200 opacity-0 group-hover/tc-block:opacity-100 transition-opacity duration-150"
+      className="absolute top-2 right-8 p-1 rounded-lg bg-pc-elevated/60 hover:bg-pc-elevated/80 border border-pc-border-strong text-pc-text-secondary hover:text-pc-text opacity-0 group-hover/tc-block:opacity-100 transition-opacity duration-150"
       title={wrap ? 'No wrap' : 'Word wrap'}
       aria-label="Toggle word wrap"
       type="button"
@@ -138,7 +138,7 @@ function CopyButton({ text }: { text: string }) {
   return (
     <button
       onClick={handleCopy}
-      className="absolute top-2 right-2 p-1 rounded-lg bg-zinc-700/60 hover:bg-zinc-600/80 border border-white/10 text-zinc-400 hover:text-zinc-200 opacity-0 group-hover/tc-block:opacity-100 transition-opacity duration-150"
+      className="absolute top-2 right-2 p-1 rounded-lg bg-pc-elevated/60 hover:bg-pc-elevated/80 border border-pc-border-strong text-pc-text-secondary hover:text-pc-text opacity-0 group-hover/tc-block:opacity-100 transition-opacity duration-150"
       title={copied ? 'Copied!' : 'Copy'}
       aria-label="Copy to clipboard"
       type="button"
@@ -266,7 +266,7 @@ export function ToolCall({ name, input, result }: { name: string; input?: Record
 
       {/* Result summary (always visible if result exists) */}
       {result && !open && (
-        <div className="mt-1 text-[11px] text-zinc-400 pl-2 truncate max-w-full">
+        <div className="mt-1 text-[11px] text-pc-text-secondary pl-2 truncate max-w-full">
           {truncateResult(result)}
         </div>
       )}
@@ -280,7 +280,7 @@ export function ToolCall({ name, input, result }: { name: string; input?: Record
               <div className="group/tc-block relative">
                 <HighlightedPre
                   text={inputStr}
-                  className="text-xs bg-[var(--pc-bg-input)]/60 border border-white/5 p-2.5 rounded-xl overflow-x-auto text-zinc-300 font-mono"
+                  className="text-xs bg-[var(--pc-bg-input)]/60 border border-pc-border p-2.5 rounded-xl overflow-x-auto text-pc-text font-mono"
                   wrap={wrap}
                 />
                 <WrapToggle wrap={wrap} onToggle={() => setWrap(!wrap)} />
@@ -299,7 +299,7 @@ export function ToolCall({ name, input, result }: { name: string; input?: Record
                       <div className="group/tc-block relative">
                         <HighlightedPre
                           text={imageData.remaining}
-                          className="text-xs bg-[var(--pc-bg-input)]/60 border border-white/5 p-2.5 rounded-xl overflow-x-auto text-zinc-300 font-mono mb-2"
+                          className="text-xs bg-[var(--pc-bg-input)]/60 border border-pc-border p-2.5 rounded-xl overflow-x-auto text-pc-text font-mono mb-2"
                           wrap={wrap}
                         />
                         <WrapToggle wrap={wrap} onToggle={() => setWrap(!wrap)} />
@@ -312,7 +312,7 @@ export function ToolCall({ name, input, result }: { name: string; input?: Record
                   <div className="group/tc-block relative">
                     <HighlightedPre
                       text={result}
-                      className="text-xs bg-[var(--pc-bg-input)]/60 border border-white/5 p-2.5 rounded-xl overflow-x-auto text-zinc-300 max-h-64 overflow-y-auto font-mono"
+                      className="text-xs bg-[var(--pc-bg-input)]/60 border border-pc-border p-2.5 rounded-xl overflow-x-auto text-pc-text max-h-64 overflow-y-auto font-mono"
                       wrap={wrap}
                     />
                     <WrapToggle wrap={wrap} onToggle={() => setWrap(!wrap)} />
diff --git a/src/components/TypingIndicator.tsx b/src/components/TypingIndicator.tsx
index 85315d6..3946dbe 100644
--- a/src/components/TypingIndicator.tsx
+++ b/src/components/TypingIndicator.tsx
@@ -24,17 +24,17 @@ export function TypingIndicator() {
 
   return (
     <div className="animate-fade-in flex items-start gap-3 px-4 py-3">
-      <div className="shrink-0 flex h-9 w-9 items-center justify-center rounded-2xl border border-white/10 bg-zinc-900/60">
-        <Bot className="h-4 w-4 text-cyan-200" />
+      <div className="shrink-0 flex h-9 w-9 items-center justify-center rounded-2xl border border-pc-border-strong bg-pc-input/60">
+        <Bot className="h-4 w-4 text-pc-accent-light" />
       </div>
-      <div className="rounded-3xl border border-white/10 bg-zinc-900/55 px-4 py-3 shadow-[0_0_0_1px_rgba(255,255,255,0.03)]">
+      <div className="rounded-3xl border border-pc-border-strong bg-pc-input/55 px-4 py-3 shadow-[0_0_0_1px_rgba(255,255,255,0.03)]">
         <div className="flex items-center gap-1.5">
           <span className="bounce-dot h-2 w-2 rounded-full bg-gradient-to-r from-cyan-300/80 to-violet-400/80" />
           <span className="bounce-dot h-2 w-2 rounded-full bg-gradient-to-r from-cyan-300/80 to-violet-400/80" />
           <span className="bounce-dot h-2 w-2 rounded-full bg-gradient-to-r from-cyan-300/80 to-violet-400/80" />
-          <span className="ml-2 text-xs text-zinc-400">{t('chat.thinking')}</span>
+          <span className="ml-2 text-xs text-pc-text-secondary">{t('chat.thinking')}</span>
           {elapsed >= 2 && (
-            <span className="text-[10px] text-zinc-500 tabular-nums ml-1">{formatElapsed(elapsed)}</span>
+            <span className="text-[10px] text-pc-text-muted tabular-nums ml-1">{formatElapsed(elapsed)}</span>
           )}
         </div>
       </div>
diff --git a/src/contexts/ThemeContext.tsx b/src/contexts/ThemeContext.tsx
index 3945191..b2af4d1 100644
--- a/src/contexts/ThemeContext.tsx
+++ b/src/contexts/ThemeContext.tsx
@@ -29,6 +29,9 @@ const themes: Record<ThemeName, Record<string, string>> = {
     '--pc-scrollbar-thumb-hover': '#71717a',
     '--pc-user-bubble': 'rgba(34,211,238,0.06)',
     '--pc-user-border': 'rgba(34,211,238,0.15)',
+    '--pc-hover': 'rgba(255,255,255,0.05)',
+    '--pc-hover-strong': 'rgba(255,255,255,0.08)',
+    '--pc-separator': 'rgba(255,255,255,0.05)',
   },
   light: {
     '--pc-bg-base': '#f4f4f5',
@@ -48,6 +51,9 @@ const themes: Record<ThemeName, Record<string, string>> = {
     '--pc-scrollbar-thumb-hover': '#71717a',
     '--pc-user-bubble': 'rgba(34,211,238,0.08)',
     '--pc-user-border': 'rgba(34,211,238,0.25)',
+    '--pc-hover': 'rgba(0,0,0,0.05)',
+    '--pc-hover-strong': 'rgba(0,0,0,0.08)',
+    '--pc-separator': 'rgba(0,0,0,0.08)',
   },
   oled: {
     '--pc-bg-base': '#000000',
@@ -67,6 +73,9 @@ const themes: Record<ThemeName, Record<string, string>> = {
     '--pc-scrollbar-thumb-hover': '#52525b',
     '--pc-user-bubble': 'rgba(34,211,238,0.05)',
     '--pc-user-border': 'rgba(34,211,238,0.12)',
+    '--pc-hover': 'rgba(255,255,255,0.04)',
+    '--pc-hover-strong': 'rgba(255,255,255,0.06)',
+    '--pc-separator': 'rgba(255,255,255,0.04)',
   },
 };
 
diff --git a/src/index.css b/src/index.css
index cba7a60..ca10c9b 100644
--- a/src/index.css
+++ b/src/index.css
@@ -1,6 +1,23 @@
 @import "tailwindcss";
 @import "highlight.js/styles/base16/material-palenight.min.css";
 
+@theme {
+  /* Theme-aware colors mapped to CSS custom properties */
+  --color-pc-base: var(--pc-bg-base);
+  --color-pc-surface: var(--pc-bg-surface);
+  --color-pc-elevated: var(--pc-bg-elevated);
+  --color-pc-input: var(--pc-bg-input);
+  --color-pc-code: var(--pc-bg-code);
+  --color-pc-border: var(--pc-border);
+  --color-pc-border-strong: var(--pc-border-strong);
+  --color-pc-text: var(--pc-text-primary);
+  --color-pc-text-secondary: var(--pc-text-secondary);
+  --color-pc-text-muted: var(--pc-text-muted);
+  --color-pc-text-faint: var(--pc-text-faint);
+  --color-pc-accent: var(--pc-accent);
+  --color-pc-accent-light: var(--pc-accent-light);
+}
+
 :root {
   --pc-bg-base: #1e1e24;
   --pc-bg-surface: #232329;
@@ -24,6 +41,9 @@
   --pc-accent-rgb: 34,211,238;
   --pc-user-bubble: rgba(34,211,238,0.06);
   --pc-user-border: rgba(34,211,238,0.15);
+  --pc-hover: rgba(255,255,255,0.05);
+  --pc-hover-strong: rgba(255,255,255,0.08);
+  --pc-separator: rgba(255,255,255,0.05);
 }
 
 * {
@@ -61,12 +81,12 @@ textarea::-webkit-scrollbar:horizontal {
 }
 
 textarea::-webkit-scrollbar-thumb {
-  background: #3f3f46;
+  background: var(--pc-scrollbar-thumb);
   border-radius: 2px;
 }
 
 textarea::-webkit-scrollbar-thumb:hover {
-  background: #52525b;
+  background: var(--pc-scrollbar-thumb-hover);
 }
 
 textarea {
@@ -118,7 +138,7 @@ html, body {
 /* Markdown styles */
 .markdown-body pre {
   background: var(--pc-bg-code) !important;
-  border: 1px solid rgba(255,255,255,0.06);
+  border: 1px solid var(--pc-border);
   border-radius: 12px;
   padding: 16px;
   overflow-x: auto;
@@ -136,7 +156,7 @@ html, body {
 }
 
 .markdown-body code {
-  background: rgba(255,255,255,0.07);
+  background: var(--pc-accent-glow);
   padding: 2px 6px;
   border-radius: 6px;
   font-size: 0.85em;
@@ -149,12 +169,12 @@ html, body {
 
 .markdown-body p { margin: 4px 0; }
 .markdown-body ul, .markdown-body ol { margin: 4px 0; padding-left: 20px; }
-.markdown-body blockquote { border-left: 3px solid rgba(34,211,238,0.4); padding-left: 12px; margin: 8px 0; opacity: 0.8; }
+.markdown-body blockquote { border-left: 3px solid var(--pc-accent-dim); padding-left: 12px; margin: 8px 0; opacity: 0.8; }
 .markdown-body h1, .markdown-body h2, .markdown-body h3 { margin: 12px 0 4px; }
 .markdown-body a { color: var(--pc-accent-light); text-decoration: underline; }
 .markdown-body table { border-collapse: collapse; margin: 8px 0; display: block; overflow-x: auto; max-width: 100%; }
-.markdown-body th, .markdown-body td { border: 1px solid rgba(255,255,255,0.08); padding: 6px 12px; }
-.markdown-body th { background: rgba(255,255,255,0.04); }
+.markdown-body th, .markdown-body td { border: 1px solid var(--pc-border); padding: 6px 12px; }
+.markdown-body th { background: var(--pc-accent-glow); }
 .markdown-body img { max-width: 100%; border-radius: 8px; }
 
 /* Accessibility: respect reduced-motion preferences */