diff --git a/docs/ui-ux-audit-2026-04-20.md b/docs/ui-ux-audit-2026-04-20.md
new file mode 100644
index 0000000..1bb1562
--- /dev/null
+++ b/docs/ui-ux-audit-2026-04-20.md
@@ -0,0 +1,87 @@
+# Audit UI/UX transverse - 2026-04-20
+
+## Périmètre audité
+
+Front React complet sous `src/components`:
+- `agents/*`
+- `projects/*`
+- `tickets/*`
+- `trackers/*`
+- `settings/*`
+- `layout/*`
+
+## Incohérences détectées (avant refactor)
+
+1. Boutons d'action dupliqués avec variations de couleurs et de tailles selon les pages (`bg-blue-600`, `bg-gray-900`, `bg-red-100`, etc.).
+2. Champs de formulaire répétés avec plusieurs variantes de classes (`input`, `select`, `textarea`) non centralisées.
+3. Cartes/blocs de contenu dupliqués (`rounded-lg border border-gray-200 bg-white p-4`) avec petites divergences de spacing.
+4. Alertes (`error`, `warning`, `success`, `info`) construites page par page avec des styles proches mais non unifiés.
+5. Badges de statut ticket réimplémentés dans plusieurs pages avec logique dupliquée et couverture de statuts non homogène.
+
+## Composants réutilisés sur plusieurs pages
+
+### 1) Boutons (multi-pages)
+
+Usage sur:
+- Agents: `AgentList`, `AgentForm`
+- Projets: `ProjectForm`, `ProjectDashboard`, `ProjectGraylog`, `ProjectLiveAgent`, `ProjectModules`, `ProjectTasks`
+- Tickets: `TicketList`, `TicketDetail`
+- Trackers: `TrackerConfig`, `TrackerList`, `FilterBuilder`
+- Settings: `SettingsPage`
+- Layout: `WindowControls`, `NotificationCenter`
+- UI: `ConfirmModal`
+
+Unification appliquée:
+- Ajout de `buttonClass()` dans [`src/components/ui/primitives.ts`](/home/leclere/Projets/IA/orchai/src/components/ui/primitives.ts)
+- Variantes centralisées: `primary`, `secondary`, `danger`, `dangerSoft`, `neutralDark`, `success`, `ghost`
+- Tailles centralisées: `xs`, `sm`, `md`, `icon`
+
+### 2) Formulaires (input/select/textarea + labels)
+
+Usage sur:
+- `AgentForm`, `ProjectForm`, `SettingsPage`, `TrackerConfig`, `ProjectGraylog`, `ProjectLiveAgent`, `ProjectTasks`, `TicketDetail`, `FilterBuilder`
+
+Unification appliquée:
+- `labelClass`, `inputClass`, `textAreaClass` dans [`src/components/ui/primitives.ts`](/home/leclere/Projets/IA/orchai/src/components/ui/primitives.ts)
+- Remplacement des classes inline répétées par ces styles partagés.
+
+### 3) Cartes de contenu
+
+Usage sur:
+- `ProjectDashboard`, `ProjectGraylog`, `ProjectLiveAgent`, `ProjectModules`, `ProjectTasks`, `TrackerConfig`, `TrackerList`, `TicketList`, `TicketDetail`, `AgentList`
+
+Unification appliquée:
+- `cardClass` / `cardContentClass` dans [`src/components/ui/primitives.ts`](/home/leclere/Projets/IA/orchai/src/components/ui/primitives.ts)
+- Réemploi des mêmes classes de surface sur les pages.
+
+### 4) Alertes (erreur/succès/warning/info)
+
+Usage sur:
+- `AgentForm`, `AgentList`, `ProjectForm`, `ProjectGraylog`, `ProjectLiveAgent`, `ProjectModules`, `ProjectTasks`, `SettingsPage`, `TrackerConfig`, `TicketDetail`
+
+Unification appliquée:
+- `noticeClass(tone, compact)` dans [`src/components/ui/primitives.ts`](/home/leclere/Projets/IA/orchai/src/components/ui/primitives.ts)
+- Tons standards: `error`, `success`, `warning`, `info`.
+
+### 5) Badges de statut ticket
+
+Usage sur:
+- `TicketList`, `TicketDetail`, `ProjectDashboard`
+
+Unification appliquée:
+- Nouveau composant [`src/components/ui/TicketStatusBadge.tsx`](/home/leclere/Projets/IA/orchai/src/components/ui/TicketStatusBadge.tsx)
+- Mapping de statuts mutualisé via `ticketStatusClass()`
+- Suppression des mappings locaux dupliqués dans les pages tickets/dashboard.
+
+## Méthode de génération commune
+
+Oui, pour les composants réutilisés multi-pages identifiés, la génération du style passe désormais par une couche commune:
+- `primitives.ts` pour les patterns UI transverses
+- `TicketStatusBadge.tsx` pour les badges de statuts ticket
+
+Cela réduit la divergence visuelle et simplifie les évolutions de design futures.
+
+## Limites / reste à harmoniser
+
+1. Certaines zones très contextuelles (ex: bulles de conversation live, badges de session archivée, blocs de diff) conservent des styles spécifiques, volontairement.
+2. Une seconde passe peut encore factoriser quelques micro-patterns (ex: tabs, badges non-ticket, liens d'action inline) si nécessaire.
diff --git a/src/components/agents/AgentForm.tsx b/src/components/agents/AgentForm.tsx
index 8af623e..9f437f4 100644
--- a/src/components/agents/AgentForm.tsx
+++ b/src/components/agents/AgentForm.tsx
@@ -3,6 +3,14 @@ import { useNavigate, useParams } from "react-router-dom";
 import { createAgent, getAgent, improveAgentPrompt, updateAgent } from "../../lib/api";
 import { getErrorMessage } from "../../lib/errors";
 import type { AgentRole, AgentTool } from "../../lib/types";
+import {
+  buttonClass,
+  inputClass,
+  labelClass,
+  noticeClass,
+  pageTitleClass,
+  textAreaClass,
+} from "../ui/primitives";
 
 export default function AgentForm() {
   const navigate = useNavigate();
@@ -76,36 +84,36 @@ export default function AgentForm() {
 
   return (
     <div className="mx-auto max-w-2xl p-8">
-      <h2 className="mb-6 text-xl font-bold">{isEditing ? "Edit agent" : "New agent"}</h2>
+      <h2 className={`mb-6 ${pageTitleClass}`}>{isEditing ? "Edit agent" : "New agent"}</h2>
 
       <form onSubmit={handleSubmit} className="space-y-4">
         {initializing && <div className="text-sm text-gray-500">Loading agent...</div>}
         {isEditing && isDefaultAgent && (
-          <div className="rounded border border-blue-200 bg-blue-50 p-3 text-sm text-blue-700">
+          <div className={noticeClass("info")}>
             This is a default agent. Its tool and script/prompt can be modified, but its name and
             role are fixed.
           </div>
         )}
 
         <div>
-          <label className="mb-1 block text-sm font-medium text-gray-700">Name</label>
+          <label className={labelClass}>Name</label>
           <input
             type="text"
             value={name}
             onChange={(e) => setName(e.target.value)}
             disabled={isEditing && isDefaultAgent}
             required
-            className="w-full rounded border border-gray-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+            className={inputClass}
           />
         </div>
 
         <div>
-          <label className="mb-1 block text-sm font-medium text-gray-700">Role</label>
+          <label className={labelClass}>Role</label>
           <select
             value={role}
             onChange={(e) => setRole(e.target.value as AgentRole)}
             disabled={isEditing && isDefaultAgent}
-            className="w-full rounded border border-gray-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+            className={inputClass}
           >
             <option value="analyst">Analyst</option>
             <option value="developer">Developer</option>
@@ -113,11 +121,11 @@ export default function AgentForm() {
         </div>
 
         <div>
-          <label className="mb-1 block text-sm font-medium text-gray-700">Tool</label>
+          <label className={labelClass}>Tool</label>
           <select
             value={tool}
             onChange={(e) => setTool(e.target.value as AgentTool)}
-            className="w-full rounded border border-gray-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+            className={inputClass}
           >
             <option value="codex">Codex</option>
             <option value="claude_code">Claude Code</option>
@@ -126,14 +134,14 @@ export default function AgentForm() {
 
         <div>
           <div className="mb-1 flex items-center justify-between gap-3">
-            <label className="block text-sm font-medium text-gray-700">
+            <label className={labelClass}>
               Script / custom prompt (appended to built-in prompt)
             </label>
             <button
               type="button"
               onClick={() => void handleImprovePrompt()}
               disabled={loading || initializing || improvingPrompt}
-              className="rounded border border-emerald-300 bg-emerald-50 px-3 py-1 text-xs font-medium text-emerald-700 hover:bg-emerald-100 disabled:cursor-not-allowed disabled:opacity-50"
+              className={buttonClass({ variant: "success", size: "xs" })}
             >
               {improvingPrompt ? "Amélioration..." : "Amélioration"}
             </button>
@@ -143,7 +151,7 @@ export default function AgentForm() {
             value={customPrompt}
             onChange={(e) => setCustomPrompt(e.target.value)}
             disabled={loading || initializing || improvingPrompt}
-            className="w-full rounded border border-gray-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 disabled:bg-gray-50"
+            className={`${textAreaClass} disabled:bg-gray-50`}
             placeholder="Extra instructions for this agent..."
           />
           <p className="mt-1 text-xs text-gray-500">
@@ -152,7 +160,7 @@ export default function AgentForm() {
         </div>
 
         {error && (
-          <div className="rounded border border-red-200 bg-red-50 p-2 text-sm text-red-600">
+          <div className={noticeClass("error", true)}>
             {error}
           </div>
         )}
@@ -161,14 +169,14 @@ export default function AgentForm() {
           <button
             type="submit"
             disabled={loading || initializing || improvingPrompt}
-            className="rounded bg-blue-600 px-4 py-2 text-sm text-white hover:bg-blue-700 disabled:opacity-50"
+            className={buttonClass({ variant: "primary" })}
           >
             {loading ? "Saving..." : isEditing ? "Save" : "Create"}
           </button>
           <button
             type="button"
             onClick={() => navigate(-1)}
-            className="rounded bg-gray-200 px-4 py-2 text-sm hover:bg-gray-300"
+            className={buttonClass({ variant: "secondary" })}
           >
             Cancel
           </button>
diff --git a/src/components/agents/AgentList.tsx b/src/components/agents/AgentList.tsx
index 7fd3522..4a6efa4 100644
--- a/src/components/agents/AgentList.tsx
+++ b/src/components/agents/AgentList.tsx
@@ -4,6 +4,13 @@ import { deleteAgent, listAgents } from "../../lib/api";
 import { getErrorMessage } from "../../lib/errors";
 import type { Agent } from "../../lib/types";
 import ConfirmModal from "../ui/ConfirmModal";
+import {
+  buttonClass,
+  cardContentClass,
+  noticeClass,
+  pageClass,
+  pageTitleClass,
+} from "../ui/primitives";
 
 export default function AgentList() {
   const [agents, setAgents] = useState<Agent[]>([]);
@@ -52,13 +59,10 @@ export default function AgentList() {
   }
 
   return (
-    <div className="p-8">
+    <div className={pageClass}>
       <div className="mb-6 flex items-center justify-between gap-3">
-        <h2 className="text-xl font-bold">Agents</h2>
-        <Link
-          to="/agents/new"
-          className="rounded bg-blue-600 px-4 py-2 text-sm text-white hover:bg-blue-700"
-        >
+        <h2 className={pageTitleClass}>Agents</h2>
+        <Link to="/agents/new" className={buttonClass({ variant: "primary" })}>
           New agent
         </Link>
       </div>
@@ -66,7 +70,7 @@ export default function AgentList() {
       {loading && <div className="text-sm text-gray-400">Loading...</div>}
 
       {error && (
-        <div className="mb-4 rounded border border-red-200 bg-red-50 p-2 text-sm text-red-600">
+        <div className={`mb-4 ${noticeClass("error", true)}`}>
           {error}
         </div>
       )}
@@ -79,7 +83,7 @@ export default function AgentList() {
         {agents.map((agent) => (
           <div
             key={agent.id}
-            className="group relative rounded-lg border border-gray-200 bg-white p-4 transition hover:border-blue-300 hover:shadow-sm focus-within:border-blue-400 focus-within:ring-2 focus-within:ring-blue-100"
+            className={`group relative transition hover:border-blue-300 hover:shadow-sm focus-within:border-blue-400 focus-within:ring-2 focus-within:ring-blue-100 ${cardContentClass}`}
           >
             <Link
               to={`/agents/${agent.id}/edit`}
@@ -117,7 +121,7 @@ export default function AgentList() {
                   <button
                     type="button"
                     onClick={() => setAgentToDelete(agent)}
-                    className="rounded bg-red-100 px-3 py-1 text-xs text-red-700 hover:bg-red-200"
+                    className={buttonClass({ variant: "dangerSoft", size: "xs" })}
                   >
                     Delete
                   </button>
diff --git a/src/components/layout/NotificationCenter.tsx b/src/components/layout/NotificationCenter.tsx
index 4252b39..ed580de 100644
--- a/src/components/layout/NotificationCenter.tsx
+++ b/src/components/layout/NotificationCenter.tsx
@@ -12,6 +12,7 @@ import {
   markNotificationRead,
 } from "../../lib/api";
 import type { OrchaiNotification } from "../../lib/types";
+import { buttonClass, cardClass, pillClass } from "../ui/primitives";
 
 type NewNotificationEvent = {
   notification: OrchaiNotification;
@@ -180,7 +181,7 @@ export default function NotificationCenter() {
       <button
         type="button"
         onClick={() => setOpen((v) => !v)}
-        className="relative rounded border border-gray-300 bg-white px-3 py-1.5 text-sm text-gray-700 hover:bg-gray-50"
+        className={`${buttonClass({ variant: "secondary", size: "sm" })} relative border border-gray-300`}
       >
         Notifications
         {unreadCount > 0 && (
@@ -191,13 +192,13 @@ export default function NotificationCenter() {
       </button>
 
       {open && (
-        <div className="absolute right-0 z-20 mt-2 w-[360px] rounded-lg border border-gray-200 bg-white shadow-lg">
+        <div className={`absolute right-0 z-20 mt-2 w-[360px] shadow-lg ${cardClass}`}>
           <div className="flex items-center justify-between border-b border-gray-200 px-3 py-2">
             <h3 className="text-sm font-semibold text-gray-800">Notifications</h3>
             <button
               type="button"
               onClick={handleMarkAllRead}
-              className="text-xs text-blue-600 hover:underline"
+              className={buttonClass({ variant: "ghost", size: "xs" })}
               disabled={!projectId || unreadCount === 0}
             >
               Mark all read
@@ -217,11 +218,7 @@ export default function NotificationCenter() {
                 onClick={() =>
                   setFilter(item.id as "all" | "unread" | "errors" | "fixes")
                 }
-                className={`rounded px-2 py-1 text-xs ${
-                  filter === item.id
-                    ? "bg-gray-900 text-white"
-                    : "bg-gray-100 text-gray-600 hover:bg-gray-200"
-                }`}
+                className={`${pillClass(filter === item.id)} text-xs`}
               >
                 {item.label}
               </button>
diff --git a/src/components/layout/WindowControls.tsx b/src/components/layout/WindowControls.tsx
index 09b3404..93336bb 100644
--- a/src/components/layout/WindowControls.tsx
+++ b/src/components/layout/WindowControls.tsx
@@ -1,4 +1,5 @@
 import { getCurrentWindow } from "@tauri-apps/api/window";
+import { buttonClass } from "../ui/primitives";
 
 async function minimizeWindow() {
   try {
@@ -31,7 +32,7 @@ export default function WindowControls() {
         type="button"
         onClick={() => void minimizeWindow()}
         title="Minimize"
-        className="h-7 w-7 rounded border border-gray-300 bg-white text-xs text-gray-700 hover:bg-gray-100"
+        className={`${buttonClass({ variant: "secondary", size: "icon" })} border border-gray-300`}
       >
         _
       </button>
@@ -39,7 +40,7 @@ export default function WindowControls() {
         type="button"
         onClick={() => void toggleMaximizeWindow()}
         title="Maximize / Restore"
-        className="h-7 w-7 rounded border border-gray-300 bg-white text-xs text-gray-700 hover:bg-gray-100"
+        className={`${buttonClass({ variant: "secondary", size: "icon" })} border border-gray-300`}
       >
         []
       </button>
@@ -47,7 +48,7 @@ export default function WindowControls() {
         type="button"
         onClick={() => void closeWindow()}
         title="Close"
-        className="h-7 w-7 rounded border border-red-300 bg-red-50 text-xs text-red-700 hover:bg-red-100"
+        className={`${buttonClass({ variant: "dangerSoft", size: "icon" })} border border-red-300`}
       >
         X
       </button>
diff --git a/src/components/projects/ProjectDashboard.tsx b/src/components/projects/ProjectDashboard.tsx
index f936b03..404a035 100644
--- a/src/components/projects/ProjectDashboard.tsx
+++ b/src/components/projects/ProjectDashboard.tsx
@@ -16,6 +16,8 @@ import type {
 } from "../../lib/types";
 import TrackerList from "../trackers/TrackerList";
 import ConfirmModal from "../ui/ConfirmModal";
+import TicketStatusBadge from "../ui/TicketStatusBadge";
+import { buttonClass, cardContentClass, pageClass, pageTitleClass } from "../ui/primitives";
 
 type ActivityLevel = "info" | "success" | "error";
 
@@ -331,19 +333,6 @@ export default function ProjectDashboard() {
     navigate("/");
   }
 
-  function statusBadgeClass(status: string): string {
-    switch (status) {
-      case "Pending":
-        return "bg-yellow-100 text-yellow-700";
-      case "Done":
-        return "bg-green-100 text-green-700";
-      case "Error":
-        return "bg-red-100 text-red-700";
-      default:
-        return "bg-blue-100 text-blue-700";
-    }
-  }
-
   function formatLeadTime(seconds: number | null): string {
     if (seconds === null || Number.isNaN(seconds)) {
       return "—";
@@ -374,26 +363,26 @@ export default function ProjectDashboard() {
   const errorRate24h = resolved24h > 0 ? `${Math.round((error24h / resolved24h) * 100)}%` : "—";
 
   return (
-    <div className="p-8">
+    <div className={pageClass}>
       <div className="flex items-center justify-between mb-6">
-        <h2 className="text-xl font-bold">{project.name}</h2>
+        <h2 className={pageTitleClass}>{project.name}</h2>
         <div className="flex gap-2">
           <Link
             to={`/projects/${project.id}/edit`}
-            className="px-3 py-1 bg-gray-200 rounded text-sm hover:bg-gray-300"
+            className={buttonClass({ variant: "secondary", size: "sm" })}
           >
             Edit
           </Link>
           <button
             onClick={() => setIsDeleteModalOpen(true)}
-            className="px-3 py-1 bg-red-100 text-red-700 rounded text-sm hover:bg-red-200"
+            className={buttonClass({ variant: "dangerSoft", size: "sm" })}
           >
             Delete
           </button>
         </div>
       </div>
 
-      <div className="bg-white rounded-lg border border-gray-200 p-4 space-y-3">
+      <div className={`${cardContentClass} space-y-3`}>
         <div>
           <span className="text-sm text-gray-500">Path:</span>
           <span className="ml-2 text-sm font-mono">{project.path}</span>
@@ -499,7 +488,7 @@ export default function ProjectDashboard() {
 
       <div className="mt-8">
         <h3 className="text-lg font-semibold mb-4">Live Activity</h3>
-        <div className="bg-white rounded-lg border border-gray-200 p-4 space-y-4">
+        <div className={`${cardContentClass} space-y-4`}>
           <div className="flex flex-wrap gap-3">
             <div className="text-sm rounded-full bg-blue-50 text-blue-700 px-3 py-1">
               Polling en cours: {activePollList.length}
@@ -566,7 +555,7 @@ export default function ProjectDashboard() {
               <Link
                 key={ticket.id}
                 to={`/tickets/${ticket.id}`}
-                className="bg-white rounded-lg border border-gray-200 p-4 flex items-center justify-between gap-4"
+                className={`${cardContentClass} flex items-center justify-between gap-4`}
               >
                 <div className="flex-1 min-w-0">
                   <div className="flex items-center gap-2">
@@ -574,11 +563,7 @@ export default function ProjectDashboard() {
                     <span className="text-sm font-medium truncate">{ticket.artifact_title}</span>
                   </div>
                 </div>
-                <span
-                  className={`text-xs px-2 py-0.5 rounded-full font-medium shrink-0 ${statusBadgeClass(ticket.status)}`}
-                >
-                  {ticket.status}
-                </span>
+                <TicketStatusBadge status={ticket.status} className="shrink-0" />
               </Link>
             ))}
           </div>
diff --git a/src/components/projects/ProjectForm.tsx b/src/components/projects/ProjectForm.tsx
index f5455c8..b551a10 100644
--- a/src/components/projects/ProjectForm.tsx
+++ b/src/components/projects/ProjectForm.tsx
@@ -3,6 +3,13 @@ import { useNavigate, useParams } from "react-router-dom";
 import { open } from "@tauri-apps/plugin-dialog";
 import { createProject, getProject, updateProject } from "../../lib/api";
 import { getErrorMessage } from "../../lib/errors";
+import {
+  buttonClass,
+  inputClass,
+  labelClass,
+  noticeClass,
+  pageTitleClass,
+} from "../ui/primitives";
 
 export default function ProjectForm() {
   const navigate = useNavigate();
@@ -60,13 +67,13 @@ export default function ProjectForm() {
 
   return (
     <div className="max-w-lg mx-auto p-8">
-      <h2 className="text-xl font-bold mb-6">
+      <h2 className={`${pageTitleClass} mb-6`}>
         {isEditing ? "Edit project" : "New project"}
       </h2>
 
       <form onSubmit={handleSubmit} className="space-y-4">
         <div>
-          <label className="block text-sm font-medium text-gray-700 mb-1">
+          <label className={labelClass}>
             Project name
           </label>
           <input
@@ -74,14 +81,14 @@ export default function ProjectForm() {
             value={name}
             onChange={(e) => setName(e.target.value)}
             required
-            className="w-full border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+            className={inputClass}
           />
         </div>
 
         {!isEditing && (
           <>
             <div>
-              <label className="block text-sm font-medium text-gray-700 mb-1">
+              <label className={labelClass}>
                 Source
               </label>
               <div className="flex gap-4">
@@ -105,7 +112,7 @@ export default function ProjectForm() {
             </div>
 
             <div>
-              <label className="block text-sm font-medium text-gray-700 mb-1">
+              <label className={labelClass}>
                 {mode === "local" ? "Folder path" : "Git URL"}
               </label>
               <div className="flex gap-2">
@@ -119,13 +126,13 @@ export default function ProjectForm() {
                       ? "/home/user/code/myproject"
                       : "https://github.com/org/repo.git"
                   }
-                  className="flex-1 border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+                  className={`flex-1 ${inputClass}`}
                 />
                 {mode === "local" && (
                   <button
                     type="button"
                     onClick={handleBrowse}
-                    className="px-3 py-2 bg-gray-200 rounded text-sm hover:bg-gray-300"
+                    className={buttonClass({ variant: "secondary" })}
                   >
                     Browse
                   </button>
@@ -136,7 +143,7 @@ export default function ProjectForm() {
         )}
 
         <div>
-          <label className="block text-sm font-medium text-gray-700 mb-1">
+          <label className={labelClass}>
             Base branch
           </label>
           <input
@@ -144,12 +151,12 @@ export default function ProjectForm() {
             value={baseBranch}
             onChange={(e) => setBaseBranch(e.target.value)}
             required
-            className="w-full border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+            className={inputClass}
           />
         </div>
 
         {error && (
-          <div className="text-red-600 text-sm bg-red-50 border border-red-200 rounded p-2">
+          <div className={noticeClass("error", true)}>
             {error}
           </div>
         )}
@@ -158,14 +165,14 @@ export default function ProjectForm() {
           <button
             type="submit"
             disabled={loading}
-            className="px-4 py-2 bg-blue-600 text-white rounded text-sm hover:bg-blue-700 disabled:opacity-50"
+            className={buttonClass({ variant: "primary" })}
           >
             {loading ? "Saving..." : isEditing ? "Save" : "Create"}
           </button>
           <button
             type="button"
             onClick={() => navigate(-1)}
-            className="px-4 py-2 bg-gray-200 rounded text-sm hover:bg-gray-300"
+            className={buttonClass({ variant: "secondary" })}
           >
             Cancel
           </button>
diff --git a/src/components/projects/ProjectGraylog.tsx b/src/components/projects/ProjectGraylog.tsx
index 70ab9a5..9935461 100644
--- a/src/components/projects/ProjectGraylog.tsx
+++ b/src/components/projects/ProjectGraylog.tsx
@@ -16,6 +16,15 @@ import type {
   GraylogDetection,
   GraylogSubject,
 } from "../../lib/types";
+import {
+  backLinkClass,
+  buttonClass,
+  cardContentClass,
+  inputClass,
+  noticeClass,
+  pageStackClass,
+  pageTitleClass,
+} from "../ui/primitives";
 
 export default function ProjectGraylog() {
   const { projectId } = useParams<{ projectId: string }>();
@@ -146,35 +155,32 @@ export default function ProjectGraylog() {
   }
 
   return (
-    <div className="space-y-6 p-8">
+    <div className={pageStackClass}>
       <div>
         {projectId && (
-          <Link to={`/projects/${projectId}`} className="mb-1 inline-flex text-sm text-blue-600 hover:underline">
+          <Link to={`/projects/${projectId}`} className={backLinkClass}>
             Back
           </Link>
         )}
-        <h2 className="text-xl font-bold">Graylog</h2>
+        <h2 className={pageTitleClass}>Graylog</h2>
       </div>
 
       {error && (
-        <div className="rounded border border-red-200 bg-red-50 p-3 text-sm text-red-700">
+        <div className={noticeClass("error")}>
           {error}
         </div>
       )}
       {success && (
-        <div className="rounded border border-green-200 bg-green-50 p-3 text-sm text-green-700">
+        <div className={noticeClass("success")}>
           {success}
         </div>
       )}
 
-      <form
-        onSubmit={handleSave}
-        className="space-y-3 rounded-lg border border-gray-200 bg-white p-4"
-      >
+      <form onSubmit={handleSave} className={`space-y-3 ${cardContentClass}`}>
         <h3 className="text-sm font-semibold text-gray-900">Configuration</h3>
 
         <input
-          className="w-full rounded border border-gray-300 px-3 py-2 text-sm"
+          className={inputClass}
           value={baseUrl}
           onChange={(event) => setBaseUrl(event.target.value)}
           placeholder="https://graylog.example.com"
@@ -182,7 +188,7 @@ export default function ProjectGraylog() {
         />
 
         <input
-          className="w-full rounded border border-gray-300 px-3 py-2 text-sm"
+          className={inputClass}
           value={apiToken}
           onChange={(event) => setApiToken(event.target.value)}
           placeholder={
@@ -195,7 +201,7 @@ export default function ProjectGraylog() {
 
         <div className="grid gap-3 md:grid-cols-2">
           <select
-            className="rounded border border-gray-300 px-3 py-2 text-sm"
+            className={inputClass}
             value={analystAgentId}
             onChange={(event) => setAnalystAgentId(event.target.value)}
             required
@@ -209,7 +215,7 @@ export default function ProjectGraylog() {
           </select>
 
           <select
-            className="rounded border border-gray-300 px-3 py-2 text-sm"
+            className={inputClass}
             value={developerAgentId}
             onChange={(event) => setDeveloperAgentId(event.target.value)}
             required
@@ -225,13 +231,13 @@ export default function ProjectGraylog() {
 
         <div className="grid gap-3 md:grid-cols-4">
           <input
-            className="rounded border border-gray-300 px-3 py-2 text-sm"
+            className={inputClass}
             value={streamId}
             onChange={(event) => setStreamId(event.target.value)}
             placeholder="stream_id (optionnel)"
           />
           <input
-            className="rounded border border-gray-300 px-3 py-2 text-sm md:col-span-3"
+            className={`${inputClass} md:col-span-3`}
             value={queryFilter}
             onChange={(event) => setQueryFilter(event.target.value)}
             placeholder="Filtre query Graylog"
@@ -241,21 +247,21 @@ export default function ProjectGraylog() {
         <div className="grid gap-3 md:grid-cols-3">
           <input
             type="number"
-            className="rounded border border-gray-300 px-3 py-2 text-sm"
+            className={inputClass}
             value={pollingIntervalMinutes}
             onChange={(event) => setPollingIntervalMinutes(Number(event.target.value))}
             min={1}
           />
           <input
             type="number"
-            className="rounded border border-gray-300 px-3 py-2 text-sm"
+            className={inputClass}
             value={lookbackMinutes}
             onChange={(event) => setLookbackMinutes(Number(event.target.value))}
             min={1}
           />
           <input
             type="number"
-            className="rounded border border-gray-300 px-3 py-2 text-sm"
+            className={inputClass}
             value={scoreThreshold}
             onChange={(event) => setScoreThreshold(Number(event.target.value))}
             min={1}
@@ -267,28 +273,28 @@ export default function ProjectGraylog() {
           <button
             type="submit"
             disabled={saving}
-            className="rounded bg-blue-600 px-4 py-2 text-sm text-white hover:bg-blue-700 disabled:opacity-50"
+            className={buttonClass({ variant: "primary" })}
           >
             {saving ? "Sauvegarde..." : "Sauvegarder"}
           </button>
           <button
             type="button"
             onClick={() => void handleTestConnection()}
-            className="rounded bg-gray-200 px-4 py-2 text-sm text-gray-800 hover:bg-gray-300"
+            className={buttonClass({ variant: "secondary" })}
           >
             Tester la connexion
           </button>
           <button
             type="button"
             onClick={() => void handleManualPoll()}
-            className="rounded bg-gray-900 px-4 py-2 text-sm text-white hover:bg-black"
+            className={buttonClass({ variant: "neutralDark" })}
           >
             Poll manuel
           </button>
         </div>
       </form>
 
-      <div className="rounded-lg border border-gray-200 bg-white p-4">
+      <div className={cardContentClass}>
         <h3 className="mb-3 text-sm font-semibold text-gray-900">Sujets détectés</h3>
 
         {loading ? (
@@ -311,7 +317,7 @@ export default function ProjectGraylog() {
         )}
       </div>
 
-      <div className="rounded-lg border border-gray-200 bg-white p-4">
+      <div className={cardContentClass}>
         <h3 className="mb-3 text-sm font-semibold text-gray-900">Dernières détections</h3>
 
         {detections.length === 0 ? (
diff --git a/src/components/projects/ProjectLiveAgent.tsx b/src/components/projects/ProjectLiveAgent.tsx
index 0c5f429..0d37155 100644
--- a/src/components/projects/ProjectLiveAgent.tsx
+++ b/src/components/projects/ProjectLiveAgent.tsx
@@ -12,6 +12,16 @@ import {
 } from "../../lib/api";
 import { getErrorMessage } from "../../lib/errors";
 import type { Agent, LiveMessage, LiveSession } from "../../lib/types";
+import {
+  backLinkClass,
+  buttonClass,
+  cardContentClass,
+  inputClass,
+  noticeClass,
+  pageStackClass,
+  pageTitleClass,
+  pillClass,
+} from "../ui/primitives";
 
 interface LiveEventPayload {
   project_id: string;
@@ -303,34 +313,34 @@ export default function ProjectLiveAgent() {
   }
 
   return (
-    <div className="p-8 space-y-6">
+    <div className={pageStackClass}>
       <div>
         {projectId && (
-          <Link to={`/projects/${projectId}`} className="mb-1 inline-flex text-sm text-blue-600 hover:underline">
+          <Link to={`/projects/${projectId}`} className={backLinkClass}>
             Back
           </Link>
         )}
-        <h2 className="text-xl font-bold">Live agent</h2>
+        <h2 className={pageTitleClass}>Live agent</h2>
       </div>
 
       {error && (
-        <div className="rounded border border-red-200 bg-red-50 p-2 text-sm text-red-600">
+        <div className={noticeClass("error", true)}>
           {error}
         </div>
       )}
       {!moduleEnabled && (
-        <div className="rounded border border-amber-200 bg-amber-50 p-2 text-sm text-amber-700">
+        <div className={noticeClass("warning", true)}>
           Le module est désactivé. La lecture reste possible, mais la création de session et l'envoi de message sont bloqués.
         </div>
       )}
 
-      <form onSubmit={handleCreateSession} className="rounded-lg border border-gray-200 bg-white p-4">
+      <form onSubmit={handleCreateSession} className={cardContentClass}>
         <h3 className="mb-3 text-sm font-semibold text-gray-800">Nouvelle session</h3>
         <div className="grid gap-3 md:grid-cols-3">
           <select
             value={selectedAgentId}
             onChange={(e) => setSelectedAgentId(e.target.value)}
-            className="rounded border border-gray-300 px-3 py-2 text-sm"
+            className={inputClass}
           >
             {usableAgents.map((agent) => (
               <option key={agent.id} value={agent.id}>
@@ -343,12 +353,12 @@ export default function ProjectLiveAgent() {
             value={sessionTitle}
             onChange={(e) => setSessionTitle(e.target.value)}
             placeholder="Titre de session (optionnel)"
-            className="rounded border border-gray-300 px-3 py-2 text-sm"
+            className={inputClass}
           />
           <button
             type="submit"
             disabled={creatingSession || !selectedAgentId || !moduleEnabled}
-            className="rounded bg-blue-600 px-4 py-2 text-sm text-white hover:bg-blue-700 disabled:opacity-50"
+            className={buttonClass({ variant: "primary" })}
           >
             {creatingSession ? "Création..." : "Créer la session"}
           </button>
@@ -356,7 +366,7 @@ export default function ProjectLiveAgent() {
       </form>
 
       <div className="grid gap-4 md:grid-cols-[260px,1fr]">
-        <div className="rounded-lg border border-gray-200 bg-white p-3">
+        <div className={`${cardContentClass} p-3`}>
           <div className="mb-2 text-xs font-semibold uppercase tracking-wide text-gray-500">
             Sessions
           </div>
@@ -371,11 +381,7 @@ export default function ProjectLiveAgent() {
                     type="button"
                     key={session.id}
                     onClick={() => void handleSessionChange(session.id)}
-                    className={`w-full rounded px-3 py-2 text-left text-sm ${
-                      selectedSessionId === session.id
-                        ? "bg-gray-900 text-white"
-                        : "bg-gray-100 text-gray-700 hover:bg-gray-200"
-                    }`}
+                    className={`${pillClass(selectedSessionId === session.id)} w-full text-left`}
                   >
                     <div className="truncate">{session.title}</div>
                     <div className="mt-1 text-[11px] opacity-70">
@@ -426,7 +432,7 @@ export default function ProjectLiveAgent() {
           </div>
         </div>
 
-        <div className="rounded-lg border border-gray-200 bg-white p-4">
+        <div className={cardContentClass}>
           <div className="mb-3 flex items-center justify-between gap-3">
             <div>
               <div className="text-sm font-semibold text-gray-800">Discussion</div>
@@ -505,7 +511,7 @@ export default function ProjectLiveAgent() {
                   : "Ton message..."
               }
               disabled={!selectedSessionId || sending || selectedSession?.status === "archived"}
-              className="flex-1 rounded border border-gray-300 px-3 py-2 text-sm"
+              className={`flex-1 ${inputClass}`}
             />
             <button
               type="submit"
@@ -516,7 +522,7 @@ export default function ProjectLiveAgent() {
                 !moduleEnabled ||
                 selectedSession?.status === "archived"
               }
-              className="rounded bg-gray-900 px-4 py-2 text-sm text-white hover:bg-black disabled:opacity-50"
+              className={buttonClass({ variant: "neutralDark" })}
             >
               {sending ? "Envoi..." : "Envoyer"}
             </button>
diff --git a/src/components/projects/ProjectModules.tsx b/src/components/projects/ProjectModules.tsx
index 97951cd..989e0d9 100644
--- a/src/components/projects/ProjectModules.tsx
+++ b/src/components/projects/ProjectModules.tsx
@@ -3,6 +3,14 @@ import { Link, useParams } from "react-router-dom";
 import { listProjectModules, setProjectModuleEnabled } from "../../lib/api";
 import { getErrorMessage } from "../../lib/errors";
 import type { ProjectModule } from "../../lib/types";
+import {
+  buttonClass,
+  cardContentClass,
+  noticeClass,
+  pageClass,
+  pageTitleClass,
+  backLinkClass,
+} from "../ui/primitives";
 
 export default function ProjectModules() {
   const { projectId } = useParams<{ projectId: string }>();
@@ -42,18 +50,18 @@ export default function ProjectModules() {
   }
 
   return (
-    <div className="p-8">
+    <div className={pageClass}>
       <div className="mb-6">
         {projectId && (
-          <Link to={`/projects/${projectId}`} className="mb-1 inline-flex text-sm text-blue-600 hover:underline">
+          <Link to={`/projects/${projectId}`} className={backLinkClass}>
             Back
           </Link>
         )}
-        <h2 className="text-xl font-bold">Modules du projet</h2>
+        <h2 className={pageTitleClass}>Modules du projet</h2>
       </div>
 
       {error && (
-        <div className="mb-4 rounded border border-red-200 bg-red-50 p-2 text-sm text-red-600">
+        <div className={`mb-4 ${noticeClass("error", true)}`}>
           {error}
         </div>
       )}
@@ -62,7 +70,7 @@ export default function ProjectModules() {
         {modules.map((mod) => (
           <div
             key={mod.id}
-            className="rounded-lg border border-gray-200 bg-white p-4"
+            className={cardContentClass}
           >
             <div className="flex items-start justify-between gap-4">
               <div>
@@ -72,7 +80,7 @@ export default function ProjectModules() {
                 {projectId && mod.module_key === "graylog_polling_auto_resolve" && (
                   <Link
                     to={`/projects/${projectId}/graylog`}
-                    className="mt-2 inline-flex rounded bg-gray-100 px-2 py-1 text-xs text-gray-700 hover:bg-gray-200"
+                    className={`mt-2 ${buttonClass({ variant: "secondary", size: "xs" })}`}
                   >
                     Configurer
                   </Link>
diff --git a/src/components/projects/ProjectTasks.tsx b/src/components/projects/ProjectTasks.tsx
index 346ac0a..5f7ddcd 100644
--- a/src/components/projects/ProjectTasks.tsx
+++ b/src/components/projects/ProjectTasks.tsx
@@ -11,6 +11,16 @@ import {
 } from "../../lib/api";
 import { getErrorMessage } from "../../lib/errors";
 import type { Agent, AgentTask } from "../../lib/types";
+import {
+  backLinkClass,
+  buttonClass,
+  cardContentClass,
+  inputClass,
+  noticeClass,
+  pageStackClass,
+  pageTitleClass,
+  textAreaClass,
+} from "../ui/primitives";
 
 interface TaskEventPayload {
   project_id: string;
@@ -152,34 +162,34 @@ export default function ProjectTasks() {
   }
 
   return (
-    <div className="space-y-6 p-8">
+    <div className={pageStackClass}>
       <div>
         {projectId && (
-          <Link to={`/projects/${projectId}`} className="mb-1 inline-flex text-sm text-blue-600 hover:underline">
+          <Link to={`/projects/${projectId}`} className={backLinkClass}>
             Back
           </Link>
         )}
-        <h2 className="text-xl font-bold">Tâches agent</h2>
+        <h2 className={pageTitleClass}>Tâches agent</h2>
       </div>
 
       {error && (
-        <div className="rounded border border-red-200 bg-red-50 p-2 text-sm text-red-600">
+        <div className={noticeClass("error", true)}>
           {error}
         </div>
       )}
       {!moduleEnabled && (
-        <div className="rounded border border-amber-200 bg-amber-50 p-2 text-sm text-amber-700">
+        <div className={noticeClass("warning", true)}>
           Le module est désactivé. Les tâches existantes restent visibles, mais la création et la relance sont bloquées.
         </div>
       )}
 
-      <form onSubmit={handleCreateTask} className="rounded-lg border border-gray-200 bg-white p-4">
+      <form onSubmit={handleCreateTask} className={cardContentClass}>
         <h3 className="mb-3 text-sm font-semibold text-gray-800">Créer une tâche</h3>
         <div className="grid gap-3 md:grid-cols-3">
           <select
             value={agentId}
             onChange={(e) => setAgentId(e.target.value)}
-            className="rounded border border-gray-300 px-3 py-2 text-sm"
+            className={inputClass}
           >
             {usableAgents.map((agent) => (
               <option key={agent.id} value={agent.id}>
@@ -193,13 +203,13 @@ export default function ProjectTasks() {
             value={title}
             onChange={(e) => setTitle(e.target.value)}
             placeholder="Titre de la tâche"
-            className="rounded border border-gray-300 px-3 py-2 text-sm"
+            className={inputClass}
           />
 
           <button
             type="submit"
             disabled={creating || !agentId || !title.trim() || !moduleEnabled}
-            className="rounded bg-blue-600 px-4 py-2 text-sm text-white hover:bg-blue-700 disabled:opacity-50"
+            className={buttonClass({ variant: "primary" })}
           >
             {creating ? "Création..." : "Créer"}
           </button>
@@ -210,13 +220,13 @@ export default function ProjectTasks() {
           onChange={(e) => setDescription(e.target.value)}
           rows={4}
           placeholder="Description détaillée"
-          className="mt-3 w-full rounded border border-gray-300 px-3 py-2 text-sm"
+          className={`mt-3 ${textAreaClass}`}
         />
       </form>
 
       <div className="space-y-3">
         {tasks.map((task) => (
-          <div key={task.id} className="rounded-lg border border-gray-200 bg-white p-4">
+          <div key={task.id} className={cardContentClass}>
             <div className="flex items-center justify-between gap-3">
               <div className="min-w-0">
                 <div className="truncate text-sm font-semibold text-gray-900">{task.title}</div>
@@ -234,13 +244,13 @@ export default function ProjectTasks() {
             )}
 
             {task.result && (
-              <div className="mt-3 rounded border border-green-200 bg-green-50 p-3 text-sm text-green-900 whitespace-pre-wrap">
+              <div className={`mt-3 whitespace-pre-wrap ${noticeClass("success")}`}>
                 {task.result}
               </div>
             )}
 
             {task.error && (
-              <div className="mt-3 rounded border border-red-200 bg-red-50 p-3 text-sm text-red-700 whitespace-pre-wrap">
+              <div className={`mt-3 whitespace-pre-wrap ${noticeClass("error")}`}>
                 {task.error}
               </div>
             )}
@@ -251,7 +261,7 @@ export default function ProjectTasks() {
                   type="button"
                   onClick={() => void handleRetry(task.id)}
                   disabled={workingTaskId === task.id || !moduleEnabled}
-                  className="rounded bg-gray-900 px-3 py-1 text-xs text-white hover:bg-black disabled:opacity-50"
+                  className={buttonClass({ variant: "neutralDark", size: "xs" })}
                 >
                   Relancer
                 </button>
@@ -262,7 +272,7 @@ export default function ProjectTasks() {
                   type="button"
                   onClick={() => void handleCancel(task.id)}
                   disabled={workingTaskId === task.id}
-                  className="rounded bg-red-100 px-3 py-1 text-xs text-red-700 hover:bg-red-200 disabled:opacity-50"
+                  className={buttonClass({ variant: "dangerSoft", size: "xs" })}
                 >
                   Annuler
                 </button>
diff --git a/src/components/settings/SettingsPage.tsx b/src/components/settings/SettingsPage.tsx
index 7c273c0..de97b44 100644
--- a/src/components/settings/SettingsPage.tsx
+++ b/src/components/settings/SettingsPage.tsx
@@ -10,6 +10,14 @@ import {
 import { getErrorMessage } from "../../lib/errors";
 import type { Project, TuleapCredentialsSafe } from "../../lib/types";
 import ConfirmModal from "../ui/ConfirmModal";
+import {
+  buttonClass,
+  cardClass,
+  inputClass,
+  labelClass,
+  noticeClass,
+  pageTitleClass,
+} from "../ui/primitives";
 
 function normalizeScope(value: string): string | null {
   return value === "" ? null : value;
@@ -160,17 +168,17 @@ export default function SettingsPage() {
 
   return (
     <div className="max-w-lg mx-auto p-8">
-      <h2 className="text-xl font-bold mb-6">Settings</h2>
+      <h2 className={`${pageTitleClass} mb-6`}>Settings</h2>
 
-      <div className="bg-white rounded-lg border border-gray-200 p-6">
+      <div className={`${cardClass} p-6`}>
         <h3 className="text-base font-semibold mb-4">Tuleap credentials</h3>
 
         <div className="mb-4">
-          <label className="block text-sm font-medium text-gray-700 mb-1">Scope</label>
+          <label className={labelClass}>Scope</label>
           <select
             value={selectedProjectId ?? ""}
             onChange={(e) => setSelectedProjectId(normalizeScope(e.target.value))}
-            className="w-full border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+            className={inputClass}
           >
             <option value="">Global fallback</option>
             {projects.map((project) => (
@@ -191,54 +199,54 @@ export default function SettingsPage() {
         ) : null}
 
         {usingGlobalFallback && (
-          <div className="mb-4 rounded border border-amber-200 bg-amber-50 p-3 text-sm text-amber-700">
+          <div className={`mb-4 ${noticeClass("warning")}`}>
             Aucun credential spécifique au projet n'est configuré. Le fallback global est utilisé.
           </div>
         )}
 
         <form onSubmit={handleSave} className="space-y-4">
           <div>
-            <label className="block text-sm font-medium text-gray-700 mb-1">Tuleap URL</label>
+            <label className={labelClass}>Tuleap URL</label>
             <input
               type="url"
               value={tuleapUrl}
               onChange={(e) => setTuleapUrl(e.target.value)}
               required
               placeholder="https://tuleap.example.com"
-              className="w-full border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+              className={inputClass}
             />
           </div>
 
           <div>
-            <label className="block text-sm font-medium text-gray-700 mb-1">Username</label>
+            <label className={labelClass}>Username</label>
             <input
               type="text"
               value={username}
               onChange={(e) => setUsername(e.target.value)}
               required
-              className="w-full border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+              className={inputClass}
             />
           </div>
 
           <div>
-            <label className="block text-sm font-medium text-gray-700 mb-1">Password</label>
+            <label className={labelClass}>Password</label>
             <input
               type="password"
               value={password}
               onChange={(e) => setPassword(e.target.value)}
               required
-              className="w-full border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+              className={inputClass}
             />
           </div>
 
           {error && (
-            <div className="text-red-600 text-sm bg-red-50 border border-red-200 rounded p-2">
+            <div className={noticeClass("error", true)}>
               {error}
             </div>
           )}
 
           {success && (
-            <div className="text-green-700 text-sm bg-green-50 border border-green-200 rounded p-2">
+            <div className={noticeClass("success", true)}>
               {success}
             </div>
           )}
@@ -247,7 +255,7 @@ export default function SettingsPage() {
             <button
               type="submit"
               disabled={saving || loadingScope}
-              className="px-4 py-2 bg-blue-600 text-white rounded text-sm hover:bg-blue-700 disabled:opacity-50"
+              className={buttonClass({ variant: "primary" })}
             >
               {saving ? "Saving..." : "Save"}
             </button>
@@ -255,7 +263,7 @@ export default function SettingsPage() {
               type="button"
               onClick={handleTest}
               disabled={testing || !existing || loadingScope}
-              className="px-4 py-2 bg-gray-200 rounded text-sm hover:bg-gray-300 disabled:opacity-50"
+              className={buttonClass({ variant: "secondary" })}
             >
               {testing ? "Testing..." : "Test connection"}
             </button>
@@ -264,7 +272,7 @@ export default function SettingsPage() {
                 type="button"
                 onClick={() => setIsDeleteModalOpen(true)}
                 disabled={deleting}
-                className="px-4 py-2 bg-red-600 text-white rounded text-sm hover:bg-red-700 disabled:opacity-50"
+                className={buttonClass({ variant: "danger" })}
               >
                 {deleting ? "Deleting..." : "Delete"}
               </button>
diff --git a/src/components/tickets/TicketDetail.tsx b/src/components/tickets/TicketDetail.tsx
index a7ce739..bd5bef2 100644
--- a/src/components/tickets/TicketDetail.tsx
+++ b/src/components/tickets/TicketDetail.tsx
@@ -14,25 +14,15 @@ import {
 import { getErrorMessage } from "../../lib/errors";
 import type { ProcessedTicket, Worktree } from "../../lib/types";
 import ConfirmModal from "../ui/ConfirmModal";
-
-function statusBadgeClass(status: string): string {
-  switch (status) {
-    case "Pending":
-      return "bg-yellow-100 text-yellow-700";
-    case "Analyzing":
-      return "bg-blue-100 text-blue-700";
-    case "Developing":
-      return "bg-purple-100 text-purple-700";
-    case "Done":
-      return "bg-green-100 text-green-700";
-    case "Error":
-      return "bg-red-100 text-red-700";
-    case "Cancelled":
-      return "bg-gray-100 text-gray-500";
-    default:
-      return "bg-gray-100 text-gray-700";
-  }
-}
+import TicketStatusBadge from "../ui/TicketStatusBadge";
+import {
+  buttonClass,
+  cardContentClass,
+  inputClass,
+  noticeClass,
+  pageClass,
+  pageTitleClass,
+} from "../ui/primitives";
 
 function DiffViewer({ diff }: { diff: string }) {
   if (!diff) {
@@ -228,22 +218,19 @@ export default function TicketDetail() {
   ];
 
   return (
-    <div className="p-8">
+    <div className={pageClass}>
       <div className="mb-6 flex items-center justify-between">
         <div>
-          <button onClick={() => navigate(-1)} className="mb-1 text-sm text-blue-600 hover:underline">
+          <button
+            onClick={() => navigate(-1)}
+            className={buttonClass({ variant: "ghost", size: "xs" })}
+          >
             Back
           </button>
-          <h2 className="flex items-center gap-3 text-xl font-bold">
+          <h2 className={`flex items-center gap-3 ${pageTitleClass}`}>
             <span className="font-mono text-base text-gray-400">#{ticket.artifact_id}</span>
             {ticket.artifact_title}
-            <span
-              className={`rounded-full px-2 py-0.5 text-xs font-medium ${statusBadgeClass(
-                ticket.status
-              )}`}
-            >
-              {ticket.status}
-            </span>
+            <TicketStatusBadge status={ticket.status} />
           </h2>
         </div>
         <div className="flex gap-2">
@@ -251,7 +238,7 @@ export default function TicketDetail() {
             <button
               onClick={handleRetry}
               disabled={loading}
-              className="rounded bg-blue-600 px-3 py-1 text-sm text-white hover:bg-blue-700 disabled:opacity-50"
+              className={buttonClass({ variant: "primary", size: "sm" })}
             >
               Retry
             </button>
@@ -262,7 +249,7 @@ export default function TicketDetail() {
             <button
               onClick={handleCancel}
               disabled={loading}
-              className="rounded bg-red-100 px-3 py-1 text-sm text-red-700 hover:bg-red-200 disabled:opacity-50"
+              className={buttonClass({ variant: "dangerSoft", size: "sm" })}
             >
               Cancel
             </button>
@@ -271,7 +258,7 @@ export default function TicketDetail() {
       </div>
 
       {error && (
-        <div className="mb-4 rounded border border-red-200 bg-red-50 p-3 text-sm text-red-700">{error}</div>
+        <div className={`mb-4 ${noticeClass("error")}`}>{error}</div>
       )}
 
       <div className="mb-6 flex gap-1 border-b border-gray-200">
@@ -295,7 +282,7 @@ export default function TicketDetail() {
 
       {tab === "info" && (
         <div className="space-y-4">
-          <div className="space-y-3 rounded-lg border border-gray-200 bg-white p-4">
+          <div className={`space-y-3 ${cardContentClass}`}>
             <div>
               <span className="text-sm text-gray-500">Status:</span>
               <span className="ml-2 text-sm">{ticket.status}</span>
@@ -340,7 +327,7 @@ export default function TicketDetail() {
           </div>
 
           {worktree && worktree.status === "Active" && (
-            <div className="rounded-lg border border-gray-200 bg-white p-4">
+            <div className={cardContentClass}>
               <h3 className="mb-3 text-sm font-semibold">Worktree Actions</h3>
               <div className="mb-2 flex items-center justify-between">
                 <p className="text-xs text-gray-500">Target branch</p>
@@ -350,7 +337,7 @@ export default function TicketDetail() {
                     onClick={() =>
                       setBranchInputMode((mode) => (mode === "select" ? "manual" : "select"))
                     }
-                    className="text-xs text-blue-600 hover:underline"
+                    className={buttonClass({ variant: "ghost", size: "xs" })}
                   >
                     {branchInputMode === "select"
                       ? "Use manual input"
@@ -364,7 +351,7 @@ export default function TicketDetail() {
                   <select
                     value={targetBranch}
                     onChange={(e) => setTargetBranch(e.target.value)}
-                    className="flex-1 rounded border border-gray-300 bg-white px-3 py-1.5 text-sm focus:border-transparent focus:ring-2 focus:ring-blue-500"
+                    className={`flex-1 bg-white ${inputClass}`}
                   >
                     {availableBranches.map((branch) => (
                       <option key={branch} value={branch}>
@@ -378,13 +365,13 @@ export default function TicketDetail() {
                     placeholder="Target branch (e.g. feature/login)"
                     value={targetBranch}
                     onChange={(e) => setTargetBranch(e.target.value)}
-                    className="flex-1 rounded border border-gray-300 px-3 py-1.5 text-sm focus:border-transparent focus:ring-2 focus:ring-blue-500"
+                    className={`flex-1 ${inputClass}`}
                   />
                 )}
                 <button
                   onClick={handleApplyFix}
                   disabled={loading || branchesLoading || !targetBranch.trim()}
-                  className="rounded bg-green-600 px-3 py-1.5 text-sm text-white hover:bg-green-700 disabled:opacity-50"
+                  className={buttonClass({ variant: "success", size: "sm" })}
                 >
                   Apply fix
                 </button>
@@ -406,7 +393,7 @@ export default function TicketDetail() {
               <button
                 onClick={() => setIsDeleteWorktreeModalOpen(true)}
                 disabled={loading}
-                className="text-sm text-red-600 hover:underline"
+                className={buttonClass({ variant: "dangerGhost", size: "xs" })}
               >
                 Delete worktree
               </button>
@@ -414,7 +401,7 @@ export default function TicketDetail() {
           )}
 
           {worktree && worktree.status === "Merged" && (
-            <div className="rounded border border-blue-200 bg-blue-50 p-3 text-sm text-blue-700">
+            <div className={noticeClass("info")}>
               Fix applied to branch: {worktree.merged_into}
             </div>
           )}
diff --git a/src/components/tickets/TicketList.tsx b/src/components/tickets/TicketList.tsx
index 1ad516a..0eacec8 100644
--- a/src/components/tickets/TicketList.tsx
+++ b/src/components/tickets/TicketList.tsx
@@ -2,25 +2,13 @@ import { useEffect, useState } from "react";
 import { Link, useParams } from "react-router-dom";
 import { getProject, listProcessedTickets } from "../../lib/api";
 import type { ProcessedTicket, Project } from "../../lib/types";
-
-function statusBadgeClass(status: string): string {
-  switch (status) {
-    case "Pending":
-      return "bg-yellow-100 text-yellow-700";
-    case "Analyzing":
-      return "bg-blue-100 text-blue-700";
-    case "Developing":
-      return "bg-purple-100 text-purple-700";
-    case "Done":
-      return "bg-green-100 text-green-700";
-    case "Error":
-      return "bg-red-100 text-red-700";
-    case "Cancelled":
-      return "bg-gray-100 text-gray-500";
-    default:
-      return "bg-gray-100 text-gray-700";
-  }
-}
+import TicketStatusBadge from "../ui/TicketStatusBadge";
+import {
+  cardContentClass,
+  pageClass,
+  pageTitleClass,
+  pillClass,
+} from "../ui/primitives";
 
 export default function TicketList() {
   const { projectId } = useParams();
@@ -41,13 +29,13 @@ export default function TicketList() {
   const filtered = filter === "all" ? tickets : tickets.filter((t) => t.status === filter);
 
   return (
-    <div className="p-8">
+    <div className={pageClass}>
       <div className="mb-6 flex items-center justify-between">
         <div>
           <Link to={`/projects/${projectId}`} className="text-sm text-blue-600 hover:underline">
             {project?.name}
           </Link>
-          <h2 className="text-xl font-bold">Processed Tickets</h2>
+          <h2 className={pageTitleClass}>Processed Tickets</h2>
         </div>
       </div>
 
@@ -56,11 +44,7 @@ export default function TicketList() {
           <button
             key={s}
             onClick={() => setFilter(s)}
-            className={`rounded px-3 py-1 text-sm ${
-              filter === s
-                ? "bg-gray-900 text-white"
-                : "bg-gray-100 text-gray-700 hover:bg-gray-200"
-            }`}
+            className={pillClass(filter === s)}
           >
             {s === "all" ? "All" : s}
             {s !== "all" && (
@@ -80,7 +64,7 @@ export default function TicketList() {
             <Link
               key={ticket.id}
               to={`/tickets/${ticket.id}`}
-              className="block rounded-lg border border-gray-200 bg-white p-4 transition-colors hover:border-blue-300"
+              className={`block transition-colors hover:border-blue-300 ${cardContentClass}`}
             >
               <div className="flex items-center justify-between gap-4">
                 <div className="min-w-0 flex-1">
@@ -100,13 +84,7 @@ export default function TicketList() {
                     )}
                   </div>
                 </div>
-                <span
-                  className={`shrink-0 rounded-full px-2 py-0.5 text-xs font-medium ${statusBadgeClass(
-                    ticket.status
-                  )}`}
-                >
-                  {ticket.status}
-                </span>
+                <TicketStatusBadge status={ticket.status} className="shrink-0" />
               </div>
             </Link>
           ))}
diff --git a/src/components/trackers/FilterBuilder.tsx b/src/components/trackers/FilterBuilder.tsx
index 45ad64f..34da802 100644
--- a/src/components/trackers/FilterBuilder.tsx
+++ b/src/components/trackers/FilterBuilder.tsx
@@ -1,4 +1,5 @@
 import type { FilterGroup, Filter, TrackerField } from "../../lib/types";
+import { buttonClass, cardContentClass, inputClass } from "../ui/primitives";
 
 const OPERATORS = ["In", "NotIn", "Equals", "NotEquals"] as const;
 
@@ -60,13 +61,13 @@ export default function FilterBuilder({ groups, onChange, availableFields }: Pro
               <div className="flex-1 border-t border-gray-200" />
             </div>
           )}
-          <div className="bg-white rounded-lg border border-gray-200 p-4">
+          <div className={cardContentClass}>
             <div className="flex items-center justify-between mb-3">
               <span className="text-sm font-medium text-gray-700">Group {gi + 1}</span>
               <button
                 type="button"
                 onClick={() => removeGroup(gi)}
-                className="text-xs text-red-500 hover:text-red-700"
+                className={buttonClass({ variant: "dangerGhost", size: "xs" })}
               >
                 Remove group
               </button>
@@ -96,7 +97,7 @@ export default function FilterBuilder({ groups, onChange, availableFields }: Pro
                               value: [],
                             })
                           }
-                          className="border border-gray-300 rounded px-2 py-1 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 flex-1"
+                          className={`flex-1 ${inputClass}`}
                         >
                           <option value="">Select field...</option>
                           {availableFields.map((f) => (
@@ -112,7 +113,7 @@ export default function FilterBuilder({ groups, onChange, availableFields }: Pro
                           onChange={(e) =>
                             updateCondition(gi, ci, { ...cond, operator: e.target.value })
                           }
-                          className="border border-gray-300 rounded px-2 py-1 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+                          className={inputClass}
                         >
                           {OPERATORS.map((op) => (
                             <option key={op} value={op}>
@@ -125,7 +126,7 @@ export default function FilterBuilder({ groups, onChange, availableFields }: Pro
                         <button
                           type="button"
                           onClick={() => removeCondition(gi, ci)}
-                          className="text-xs text-red-400 hover:text-red-600 whitespace-nowrap"
+                          className={`${buttonClass({ variant: "dangerGhost", size: "xs" })} whitespace-nowrap`}
                         >
                           Remove
                         </button>
@@ -162,7 +163,7 @@ export default function FilterBuilder({ groups, onChange, availableFields }: Pro
             <button
               type="button"
               onClick={() => addCondition(gi)}
-              className="mt-3 text-xs text-blue-600 hover:text-blue-800"
+              className={`${buttonClass({ variant: "ghost", size: "xs" })} mt-3`}
             >
               + Add OR condition
             </button>
@@ -173,7 +174,7 @@ export default function FilterBuilder({ groups, onChange, availableFields }: Pro
       <button
         type="button"
         onClick={addGroup}
-        className="w-full px-4 py-2 border-2 border-dashed border-gray-300 rounded text-sm text-gray-500 hover:border-blue-400 hover:text-blue-600 transition-colors"
+        className={`${buttonClass({ variant: "secondary", fullWidth: true })} border-2 border-dashed border-gray-300 text-gray-500 hover:border-blue-400 hover:text-blue-600`}
       >
         + Add filter group (AND)
       </button>
diff --git a/src/components/trackers/TrackerConfig.tsx b/src/components/trackers/TrackerConfig.tsx
index 725f00f..5c2cd67 100644
--- a/src/components/trackers/TrackerConfig.tsx
+++ b/src/components/trackers/TrackerConfig.tsx
@@ -11,6 +11,14 @@ import {
 import { getErrorMessage } from "../../lib/errors";
 import type { FilterGroup, TrackerField, Agent } from "../../lib/types";
 import FilterBuilder from "./FilterBuilder";
+import {
+  buttonClass,
+  cardContentClass,
+  inputClass,
+  labelClass,
+  noticeClass,
+  pageTitleClass,
+} from "../ui/primitives";
 
 export default function TrackerConfig() {
   const { projectId, trackerConfigId } = useParams<{ projectId: string; trackerConfigId: string }>();
@@ -165,7 +173,7 @@ export default function TrackerConfig() {
 
   return (
     <div className="max-w-2xl mx-auto p-8">
-      <h2 className="text-xl font-bold mb-6">
+      <h2 className={`${pageTitleClass} mb-6`}>
         {isEditing ? "Edit tracker" : "Add tracker"}
       </h2>
 
@@ -175,21 +183,21 @@ export default function TrackerConfig() {
         )}
 
         {analystAgents.length === 0 || developerAgents.length === 0 ? (
-          <div className="rounded border border-amber-200 bg-amber-50 p-3 text-sm text-amber-700">
+          <div className={noticeClass("warning")}>
             You need at least one analyst agent and one developer agent before creating a tracker.
           </div>
         ) : null}
 
         {isEditing && trackerStatus === "invalid" && (
-          <div className="rounded border border-red-200 bg-red-50 p-3 text-sm text-red-700">
+          <div className={noticeClass("error")}>
             This tracker is invalid. Select valid agents and save to reactivate it.
           </div>
         )}
 
         {/* Basic fields */}
-        <div className="bg-white rounded-lg border border-gray-200 p-4 space-y-4">
+        <div className={`${cardContentClass} space-y-4`}>
           <div>
-            <label className="block text-sm font-medium text-gray-700 mb-1">
+            <label className={labelClass}>
               Tracker ID
             </label>
             <div className="flex gap-2">
@@ -203,14 +211,14 @@ export default function TrackerConfig() {
                 }}
                 required
                 min={1}
-                className="w-40 border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+                className={`w-40 ${inputClass}`}
                 placeholder="e.g. 42"
               />
               <button
                 type="button"
                 onClick={handleLoadFields}
                 disabled={!trackerId || fieldsLoading}
-                className="px-4 py-2 bg-blue-600 text-white rounded text-sm hover:bg-blue-700 disabled:opacity-50"
+                className={buttonClass({ variant: "primary" })}
               >
                 {fieldsLoading ? "Loading..." : "Load tracker fields"}
               </button>
@@ -218,7 +226,7 @@ export default function TrackerConfig() {
           </div>
 
           <div>
-            <label className="block text-sm font-medium text-gray-700 mb-1">
+            <label className={labelClass}>
               Label
             </label>
             <input
@@ -227,12 +235,12 @@ export default function TrackerConfig() {
               onChange={(e) => setTrackerLabel(e.target.value)}
               required
               placeholder="e.g. Bugs"
-              className="w-full border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+              className={inputClass}
             />
           </div>
 
           <div>
-            <label className="block text-sm font-medium text-gray-700 mb-1">
+            <label className={labelClass}>
               Polling interval (minutes)
             </label>
             <input
@@ -241,7 +249,7 @@ export default function TrackerConfig() {
               onChange={(e) => setPollingInterval(Number(e.target.value))}
               required
               min={1}
-              className="w-40 border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+              className={`w-40 ${inputClass}`}
             />
           </div>
 
@@ -270,17 +278,17 @@ export default function TrackerConfig() {
         )}
 
         {/* Agent config */}
-        <div className="bg-white rounded-lg border border-gray-200 p-4 space-y-4">
+        <div className={`${cardContentClass} space-y-4`}>
           <h3 className="text-sm font-semibold text-gray-700">Agent configuration</h3>
           <div>
-            <label className="block text-sm font-medium text-gray-700 mb-1">
+            <label className={labelClass}>
               Analyst agent
             </label>
             <select
               value={analystAgentId}
               onChange={(e) => setAnalystAgentId(e.target.value)}
               required
-              className="w-full border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+              className={inputClass}
             >
               <option value="">Select an analyst agent</option>
               {analystAgents.map((agent) => (
@@ -291,14 +299,14 @@ export default function TrackerConfig() {
             </select>
           </div>
           <div>
-            <label className="block text-sm font-medium text-gray-700 mb-1">
+            <label className={labelClass}>
               Developer agent
             </label>
             <select
               value={developerAgentId}
               onChange={(e) => setDeveloperAgentId(e.target.value)}
               required
-              className="w-full border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+              className={inputClass}
             >
               <option value="">Select a developer agent</option>
               {developerAgents.map((agent) => (
@@ -311,7 +319,7 @@ export default function TrackerConfig() {
         </div>
 
         {error && (
-          <div className="text-red-600 text-sm bg-red-50 border border-red-200 rounded p-2">
+          <div className={noticeClass("error", true)}>
             {error}
           </div>
         )}
@@ -320,14 +328,14 @@ export default function TrackerConfig() {
           <button
             type="submit"
             disabled={loading || initializing}
-            className="px-4 py-2 bg-blue-600 text-white rounded text-sm hover:bg-blue-700 disabled:opacity-50"
+            className={buttonClass({ variant: "primary" })}
           >
             {loading ? "Saving..." : isEditing ? "Save tracker" : "Add tracker"}
           </button>
           <button
             type="button"
             onClick={() => navigate(`/projects/${projectId}`)}
-            className="px-4 py-2 bg-gray-200 rounded text-sm hover:bg-gray-300"
+            className={buttonClass({ variant: "secondary" })}
           >
             Cancel
           </button>
diff --git a/src/components/trackers/TrackerList.tsx b/src/components/trackers/TrackerList.tsx
index 29a19e8..e4a44e0 100644
--- a/src/components/trackers/TrackerList.tsx
+++ b/src/components/trackers/TrackerList.tsx
@@ -3,6 +3,7 @@ import { Link } from "react-router-dom";
 import { manualPoll, updateTracker, removeTracker } from "../../lib/api";
 import type { WatchedTracker } from "../../lib/types";
 import ConfirmModal from "../ui/ConfirmModal";
+import { buttonClass, cardContentClass } from "../ui/primitives";
 
 interface Props {
   trackers: WatchedTracker[];
@@ -68,7 +69,7 @@ export default function TrackerList({ trackers, projectId, onRefresh }: Props) {
       {trackers.map((tracker) => (
         <div
           key={tracker.id}
-          className="bg-white rounded-lg border border-gray-200 p-4 flex items-center justify-between gap-4"
+          className={`flex items-center justify-between gap-4 ${cardContentClass}`}
         >
           <div className="flex-1 min-w-0">
             <div className="flex items-center gap-2">
@@ -98,13 +99,13 @@ export default function TrackerList({ trackers, projectId, onRefresh }: Props) {
               type="button"
               onClick={() => handlePollNow(tracker)}
               disabled={pollingIds.includes(tracker.id) || tracker.status !== "valid"}
-              className="px-3 py-1 bg-blue-600 text-white rounded text-xs hover:bg-blue-700 disabled:opacity-50"
+              className={buttonClass({ variant: "primary", size: "xs" })}
             >
               {pollingIds.includes(tracker.id) ? "Polling..." : "Poll now"}
             </button>
             <Link
               to={`/projects/${projectId}/trackers/${tracker.id}/edit`}
-              className="px-3 py-1 bg-gray-200 text-gray-700 rounded text-xs hover:bg-gray-300"
+              className={buttonClass({ variant: "secondary", size: "xs" })}
             >
               Edit
             </Link>
@@ -112,14 +113,14 @@ export default function TrackerList({ trackers, projectId, onRefresh }: Props) {
               type="button"
               onClick={() => handleToggleEnabled(tracker)}
               disabled={tracker.status !== "valid"}
-              className="px-3 py-1 bg-gray-200 text-gray-700 rounded text-xs hover:bg-gray-300"
+              className={buttonClass({ variant: "secondary", size: "xs" })}
             >
               {tracker.enabled ? "Pause" : "Resume"}
             </button>
             <button
               type="button"
               onClick={() => setTrackerToRemove(tracker)}
-              className="px-3 py-1 bg-red-100 text-red-700 rounded text-xs hover:bg-red-200"
+              className={buttonClass({ variant: "dangerSoft", size: "xs" })}
             >
               Remove
             </button>
@@ -129,7 +130,7 @@ export default function TrackerList({ trackers, projectId, onRefresh }: Props) {
 
       <Link
         to={`/projects/${projectId}/trackers/new`}
-        className="inline-block px-4 py-2 bg-blue-600 text-white rounded text-sm hover:bg-blue-700"
+        className={buttonClass({ variant: "primary" })}
       >
         Add tracker
       </Link>
diff --git a/src/components/ui/ConfirmModal.tsx b/src/components/ui/ConfirmModal.tsx
index e52c91b..b9c8e4f 100644
--- a/src/components/ui/ConfirmModal.tsx
+++ b/src/components/ui/ConfirmModal.tsx
@@ -1,4 +1,5 @@
 import { useEffect } from "react";
+import { buttonClass, cardClass } from "./primitives";
 
 interface ConfirmModalProps {
   isOpen: boolean;
@@ -45,7 +46,7 @@ export default function ConfirmModal({
         role="dialog"
         aria-modal="true"
         aria-label={title}
-        className="w-full max-w-md rounded-lg border border-gray-200 bg-white p-5 shadow-xl"
+        className={`w-full max-w-md p-5 shadow-xl ${cardClass}`}
         onClick={(event) => event.stopPropagation()}
       >
         <h3 className="text-base font-semibold text-gray-900">{title}</h3>
@@ -55,7 +56,7 @@ export default function ConfirmModal({
           <button
             type="button"
             onClick={onCancel}
-            className="rounded bg-gray-200 px-3 py-1.5 text-sm text-gray-700 hover:bg-gray-300"
+            className={buttonClass({ variant: "secondary", size: "sm" })}
           >
             {cancelLabel}
           </button>
@@ -63,7 +64,7 @@ export default function ConfirmModal({
             type="button"
             onClick={onConfirm}
             disabled={confirmDisabled}
-            className="rounded bg-red-600 px-3 py-1.5 text-sm text-white hover:bg-red-700 disabled:opacity-50"
+            className={buttonClass({ variant: "danger", size: "sm" })}
           >
             {confirmLabel}
           </button>
diff --git a/src/components/ui/TicketStatusBadge.tsx b/src/components/ui/TicketStatusBadge.tsx
new file mode 100644
index 0000000..c6158a1
--- /dev/null
+++ b/src/components/ui/TicketStatusBadge.tsx
@@ -0,0 +1,33 @@
+import { cx } from "./primitives";
+
+const statusClasses: Record<string, string> = {
+  Pending: "bg-yellow-100 text-yellow-700",
+  Analyzing: "bg-blue-100 text-blue-700",
+  Developing: "bg-purple-100 text-purple-700",
+  Done: "bg-green-100 text-green-700",
+  Error: "bg-red-100 text-red-700",
+  Cancelled: "bg-gray-100 text-gray-500",
+};
+
+export function ticketStatusClass(status: string): string {
+  return statusClasses[status] ?? "bg-gray-100 text-gray-700";
+}
+
+interface TicketStatusBadgeProps {
+  status: string;
+  className?: string;
+}
+
+export default function TicketStatusBadge({ status, className }: TicketStatusBadgeProps) {
+  return (
+    <span
+      className={cx(
+        "rounded-full px-2 py-0.5 text-xs font-medium",
+        ticketStatusClass(status),
+        className
+      )}
+    >
+      {status}
+    </span>
+  );
+}
diff --git a/src/components/ui/primitives.ts b/src/components/ui/primitives.ts
new file mode 100644
index 0000000..f40a94d
--- /dev/null
+++ b/src/components/ui/primitives.ts
@@ -0,0 +1,89 @@
+export function cx(...classes: Array<string | false | null | undefined>): string {
+  return classes.filter(Boolean).join(" ");
+}
+
+export type ButtonVariant =
+  | "primary"
+  | "secondary"
+  | "danger"
+  | "dangerSoft"
+  | "dangerGhost"
+  | "neutralDark"
+  | "success"
+  | "ghost";
+
+export type ButtonSize = "xs" | "sm" | "md" | "icon";
+
+interface ButtonClassOptions {
+  variant?: ButtonVariant;
+  size?: ButtonSize;
+  fullWidth?: boolean;
+}
+
+const buttonVariantClasses: Record<ButtonVariant, string> = {
+  primary: "bg-blue-600 text-white hover:bg-blue-700",
+  secondary: "bg-gray-200 text-gray-700 hover:bg-gray-300",
+  danger: "bg-red-600 text-white hover:bg-red-700",
+  dangerSoft: "bg-red-100 text-red-700 hover:bg-red-200",
+  dangerGhost: "bg-transparent text-red-600 hover:underline",
+  neutralDark: "bg-gray-900 text-white hover:bg-black",
+  success: "bg-green-600 text-white hover:bg-green-700",
+  ghost: "bg-transparent text-blue-600 hover:underline",
+};
+
+const buttonSizeClasses: Record<ButtonSize, string> = {
+  xs: "px-3 py-1 text-xs",
+  sm: "px-3 py-1.5 text-sm",
+  md: "px-4 py-2 text-sm",
+  icon: "h-7 w-7 px-0 text-xs",
+};
+
+export function buttonClass({
+  variant = "secondary",
+  size = "md",
+  fullWidth = false,
+}: ButtonClassOptions = {}): string {
+  return cx(
+    "inline-flex items-center justify-center rounded font-medium transition-colors disabled:opacity-50",
+    buttonVariantClasses[variant],
+    buttonSizeClasses[size],
+    fullWidth && "w-full"
+  );
+}
+
+export const pageClass = "p-8";
+export const pageStackClass = "space-y-6 p-8";
+export const pageTitleClass = "text-xl font-bold";
+export const backLinkClass = "mb-1 inline-flex text-sm text-blue-600 hover:underline";
+
+export const cardClass = "rounded-lg border border-gray-200 bg-white";
+export const cardContentClass = `${cardClass} p-4`;
+
+export const labelClass = "mb-1 block text-sm font-medium text-gray-700";
+export const inputClass =
+  "w-full rounded border border-gray-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500";
+export const textAreaClass =
+  "w-full rounded border border-gray-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500";
+
+export type NoticeTone = "error" | "success" | "warning" | "info";
+
+const noticeToneClasses: Record<NoticeTone, string> = {
+  error: "border-red-200 bg-red-50 text-red-700",
+  success: "border-green-200 bg-green-50 text-green-700",
+  warning: "border-amber-200 bg-amber-50 text-amber-700",
+  info: "border-blue-200 bg-blue-50 text-blue-700",
+};
+
+export function noticeClass(tone: NoticeTone, compact = false): string {
+  return cx(
+    "rounded border text-sm",
+    compact ? "p-2" : "p-3",
+    noticeToneClasses[tone]
+  );
+}
+
+export function pillClass(active: boolean): string {
+  return active
+    ? "rounded px-3 py-1 text-sm bg-gray-900 text-white"
+    : "rounded px-3 py-1 text-sm bg-gray-100 text-gray-700 hover:bg-gray-200";
+}