diff --git a/frontend/app/globals.css b/frontend/app/globals.css
index fd85b602..b25f8169 100644
--- a/frontend/app/globals.css
+++ b/frontend/app/globals.css
@@ -7,19 +7,7 @@
   --color-foreground: var(--foreground);
   --font-sans: var(--font-geist-sans);
   --font-mono: var(--font-geist-mono);
-  --color-sidebar-ring: var(--sidebar-ring);
-  --color-sidebar-border: var(--sidebar-border);
-  --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
-  --color-sidebar-accent: var(--sidebar-accent);
-  --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
-  --color-sidebar-primary: var(--sidebar-primary);
-  --color-sidebar-foreground: var(--sidebar-foreground);
-  --color-sidebar: var(--sidebar);
-  --color-chart-5: var(--chart-5);
-  --color-chart-4: var(--chart-4);
-  --color-chart-3: var(--chart-3);
-  --color-chart-2: var(--chart-2);
-  --color-chart-1: var(--chart-1);
+
   --color-ring: var(--ring);
   --color-input: var(--input);
   --color-border: var(--border);
@@ -44,7 +32,7 @@
   --animate-pulse-soft: pulse-soft 2.8s ease-in-out infinite;
 }
 
-:root {
+@theme {
   --radius: 0.625rem;
   --background: oklch(1 0 0);
   --foreground: oklch(0.145 0 0);
@@ -77,6 +65,9 @@
   --sidebar-accent-foreground: oklch(0.205 0 0);
   --sidebar-border: oklch(0.922 0 0);
   --sidebar-ring: oklch(0.708 0 0);
+
+  --accent-primary: #1e5eff;
+  --accent-hover: #174ad6;
 }
 
 .dark {
@@ -111,15 +102,34 @@
   --sidebar-accent-foreground: oklch(0.985 0 0);
   --sidebar-border: oklch(1 0 0 / 10%);
   --sidebar-ring: oklch(0.556 0 0);
+
+  --accent-primary: #ff2d55;
+  --accent-hover: #e0264b;
 }
 
 @layer base {
   * {
     @apply border-border outline-ring/50;
   }
+
   body {
     @apply bg-background text-foreground;
   }
+
+  button,
+  [role='button'],
+  a {
+    cursor: pointer;
+  }
+}
+
+@layer components {
+  .btn {
+    background-color: var(--accent-primary);
+  }
+  .btn:hover {
+    background-color: var(--accent-hover);
+  }
 }
 
 .no-select {
diff --git a/frontend/components/quiz/QuizCard.tsx b/frontend/components/quiz/QuizCard.tsx
index 882e2bad..d30a8291 100644
--- a/frontend/components/quiz/QuizCard.tsx
+++ b/frontend/components/quiz/QuizCard.tsx
@@ -24,27 +24,28 @@ interface QuizCardProps {
 
 export function QuizCard({ quiz, userProgress }: QuizCardProps) {
   const t = useTranslations('quiz.card');
-  const percentage = userProgress && userProgress.totalQuestions > 0
-    ? Math.round((userProgress.bestScore / userProgress.totalQuestions) * 100)
-    : 0;
+  const percentage =
+    userProgress && userProgress.totalQuestions > 0
+      ? Math.round((userProgress.bestScore / userProgress.totalQuestions) * 100)
+      : 0;
 
   return (
     <div className="flex flex-col rounded-xl border border-gray-200 dark:border-neutral-800 bg-white dark:bg-neutral-900 p-5 shadow-sm hover:shadow-md transition-shadow">
       <div className="flex-grow">
-      <div className="flex gap-2 mb-3">
-        <Badge variant="blue">{quiz.categoryName ?? t('uncategorized')}</Badge>
-        {userProgress && (
-          <Badge variant="success">{t('completed')}</Badge>
+        <div className="flex gap-2 mb-3">
+          <Badge variant="blue">
+            {quiz.categoryName ?? t('uncategorized')}
+          </Badge>
+          {userProgress && <Badge variant="success">{t('completed')}</Badge>}
+        </div>
+        <h2 className="text-xl font-semibold mb-2">
+          {quiz.title ?? quiz.slug}
+        </h2>
+        {quiz.description && (
+          <p className="line-clamp-2 text-sm text-gray-600 dark:text-gray-400 mb-3">
+            {quiz.description}
+          </p>
         )}
-      </div>
-      <h2 className="text-xl font-semibold mb-2">
-        {quiz.title ?? quiz.slug}
-      </h2>
-      {quiz.description && (
-        <p className="line-clamp-2 text-sm text-gray-600 dark:text-gray-400 mb-3">
-          {quiz.description}
-        </p>
-      )}
         <div className="flex gap-3 text-xs text-gray-500 mb-3">
           <span className="flex items-center gap-1">
             <FileText className="w-3.5 h-3.5 text-blue-500 dark:text-blue-400" />
@@ -52,34 +53,38 @@ export function QuizCard({ quiz, userProgress }: QuizCardProps) {
           </span>
           <span className="flex items-center gap-1">
             <Clock className="w-3.5 h-3.5 text-blue-500 dark:text-blue-400" />
-            {Math.floor((quiz.timeLimitSeconds ?? quiz.questionsCount * 30) / 60)} {t('min')}
+            {Math.floor(
+              (quiz.timeLimitSeconds ?? quiz.questionsCount * 30) / 60
+            )}{' '}
+            {t('min')}
           </span>
         </div>
       </div>
       {userProgress && (
-    <div className="mb-6">
-      <div className="flex justify-between text-xs mb-1.5">
-        <span className="text-gray-600 dark:text-gray-400">
-          {t('best')} {userProgress.bestScore}/{userProgress.totalQuestions}
-        </span>
-        <span className="text-gray-500">
-          {userProgress.attemptsCount} {userProgress.attemptsCount === 1 ? t('attempt') : t('attempts')}
-        </span>
-        <span className="font-medium text-gray-900 dark:text-gray-100">
-          {percentage}%
-        </span>
-      </div>
-      <div className="h-1.5 bg-gray-200 dark:bg-neutral-800 rounded-full overflow-hidden">
-        <div
-          className="h-full bg-blue-600 rounded-full transition-all"
-          style={{ width: `${percentage}%` }}
-        />
-      </div>
-    </div>
-     )}
+        <div className="mb-6">
+          <div className="flex justify-between text-xs mb-1.5">
+            <span className="text-gray-600 dark:text-gray-400">
+              {t('best')} {userProgress.bestScore}/{userProgress.totalQuestions}
+            </span>
+            <span className="text-gray-500">
+              {userProgress.attemptsCount}{' '}
+              {userProgress.attemptsCount === 1 ? t('attempt') : t('attempts')}
+            </span>
+            <span className="font-medium text-gray-900 dark:text-gray-100">
+              {percentage}%
+            </span>
+          </div>
+          <div className="h-1.5 bg-gray-200 dark:bg-neutral-800 rounded-full overflow-hidden">
+            <div
+              className="h-full bg-blue-600 rounded-full transition-all"
+              style={{ width: `${percentage}%` }}
+            />
+          </div>
+        </div>
+      )}
       <Link
         href={`/quiz/${quiz.slug}`}
-        className="block w-full text-center rounded-lg bg-blue-600 text-white px-4 py-2.5 text-sm font-medium hover:bg-blue-500 transition-colors"
+        className="btn block w-full text-center rounded-lg text-white px-4 py-2.5 text-sm font-medium transition-colors"
       >
         {userProgress ? t('retake') : t('start')}
       </Link>