diff --git a/src/constants/quiz.constants.ts b/src/constants/quiz.constants.ts
new file mode 100644
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+++ b/src/constants/quiz.constants.ts
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+/**
+ * Quiz and search domain constants.
+ * Extracted from magic numbers used across quiz and search stores.
+ */
+
+// Quiz
+export const QUIZ_MAX_SEARCH_HISTORY = 10;
+export const QUIZ_NOTIFICATION_MAX_STORED = 200;
+export const QUIZ_NOTIFICATION_ID_PREFIX = 'ntf_';
+export const QUIZ_NOTIFICATION_STORAGE_KEY = 'notifications_v1';
+
+// Search defaults
+export const SEARCH_DEFAULT_SORT = 'relevance' as const;
+export const SEARCH_DURATION_MIN = 0;
+export const SEARCH_DURATION_MAX = 20;
+export const SEARCH_PRICE_MIN = 0;
+export const SEARCH_PRICE_MAX = 1000;
+export const SEARCH_PRICE_ABSOLUTE_MAX = 10000;
+export const SEARCH_STORAGE_KEY = 'search-filters';
+
+// Pagination
+export const PAGE_SIZE_DEFAULT = 10;
+export const PAGE_SIZE_OPTIONS = [10, 25, 50, 100] as const;
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