Split card design into front+back, add sound effects & background music

Card design:
- Separate cardFront + cardBack (each own/equip independently)
- Fronts: classic (free), ivory/rosegold (buy), parchment/mint (earned)
- Backs: classic (free), sapphire/emerald (buy), ruby/royal (earned)
- PlayingCard `front` prop; table applies front to all faces, back to opponents
- Profile has front + back pickers; shop has both sections

Audio:
- Web Audio synth engine (no asset files): SFX for card/deal/trump/trick,
  win/lose, message, notify, award, levelup, purchase, kot + ambient music
- Toggles in profile (Audio) + mute button in game HUD; prefs persisted
- Wired across game-store, rewards, daily, shop, chat

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/online/gamification.ts

@@ -4,7 +4,8 @@
 import {
   AchievementDef,
   AchievementUnlock,
-  CardStyleDef,
+  CardBackDef,
+  CardFrontDef,
   LeagueInfo,
   MatchSummary,
   PlayerStats,
@@ -218,16 +219,51 @@ export function titleUnlocked(
 
 /* ---------------------------- Card styles ---------------------------- */
 
-export const CARD_STYLES: CardStyleDef[] = [
-  { id: "classic", nameFa: "کلاسیک", nameEn: "Classic", c1: "#14274f", c2: "#0a142e", accent: "#d4af37", price: 0 },
+// Card BACKS (pattern on the reverse of every card).
+export const CARD_BACKS: CardBackDef[] = [
+  { id: "classic", nameFa: "کلاسیک", nameEn: "Classic", c1: "#14274f", c2: "#0a142e", accent: "#d4af37", price: 0, default: true },
   { id: "sapphire", nameFa: "یاقوت کبود", nameEn: "Sapphire", c1: "#0b3a82", c2: "#06173a", accent: "#6aa6ff", price: 800 },
-  { id: "ruby", nameFa: "یاقوت", nameEn: "Ruby", c1: "#7f1d2e", c2: "#2b0a12", accent: "#ff7a90", price: 800 },
   { id: "emerald", nameFa: "زمرد", nameEn: "Emerald", c1: "#0d6b5e", c2: "#062420", accent: "#2dd4bf", price: 1000 },
-  { id: "royal", nameFa: "سلطنتی", nameEn: "Royal", c1: "#4a1d7f", c2: "#1a0a2e", accent: "#c77dff", price: 1500 },
+  { id: "ruby", nameFa: "یاقوت", nameEn: "Ruby", c1: "#7f1d2e", c2: "#2b0a12", accent: "#ff7a90", price: 0, unlockRating: 1300 }, // earned
+  { id: "royal", nameFa: "سلطنتی", nameEn: "Royal", c1: "#4a1d7f", c2: "#1a0a2e", accent: "#c77dff", price: 0, unlockWins: 50 }, // earned
 ];
 
-export function cardStyleById(id: string): CardStyleDef {
-  return CARD_STYLES.find((c) => c.id === id) ?? CARD_STYLES[0];
+// Card FRONTS (the face background/border behind the suit + rank).
+export const CARD_FRONTS: CardFrontDef[] = [
+  { id: "classic", nameFa: "کلاسیک", nameEn: "Classic", bg1: "#fffdf7", bg2: "#f3ead2", border: "rgba(0,0,0,0.12)", price: 0, default: true },
+  { id: "ivory", nameFa: "عاج", nameEn: "Ivory", bg1: "#ffffff", bg2: "#eef2f8", border: "#c9ccd6", price: 600 },
+  { id: "rosegold", nameFa: "رزگلد", nameEn: "Rose Gold", bg1: "#fff1ee", bg2: "#f6d9cf", border: "#d98a72", price: 900 },
+  { id: "parchment", nameFa: "پوست‌نوشت", nameEn: "Parchment", bg1: "#fbf2d8", bg2: "#efd9a3", border: "#caa84a", price: 0, unlockRating: 1300 }, // earned
+  { id: "mint", nameFa: "نعنایی", nameEn: "Mint", bg1: "#f0fff8", bg2: "#d3f3e3", border: "#57c79a", price: 0, unlockWins: 50 }, // earned
+];
+
+export function cardBackById(id: string): CardBackDef {
+  return CARD_BACKS.find((c) => c.id === id) ?? CARD_BACKS[0];
+}
+export function cardFrontById(id: string): CardFrontDef {
+  return CARD_FRONTS.find((c) => c.id === id) ?? CARD_FRONTS[0];
+}
+
+function ownedCosmeticIds(
+  defs: { id: string; price: number; default?: boolean; unlockRating?: number; unlockWins?: number }[],
+  profile: UserProfile,
+  purchased: string[]
+): string[] {
+  const ids = new Set<string>();
+  for (const d of defs) {
+    const earned =
+      (d.unlockRating != null && profile.rating >= d.unlockRating) ||
+      (d.unlockWins != null && profile.stats.wins >= d.unlockWins);
+    if (d.default || earned || purchased.includes(d.id)) ids.add(d.id);
+  }
+  return [...ids];
+}
+
+export function ownedCardBackIds(profile: UserProfile): string[] {
+  return ownedCosmeticIds(CARD_BACKS, profile, profile.ownedCardBacks ?? []);
+}
+export function ownedCardFrontIds(profile: UserProfile): string[] {
+  return ownedCosmeticIds(CARD_FRONTS, profile, profile.ownedCardFronts ?? []);
 }
 
 /* --------------------- Reactions (Sheklak / شکلک) -------------------- */

src/lib/online/mock-service.ts

@@ -3,7 +3,8 @@
 // with timers, and computes rewards via gamification.ts.
 
 import {
-  CARD_STYLES,
+  CARD_BACKS,
+  CARD_FRONTS,
   REACTION_PACKS,
   STICKER_PACKS,
   applyMatchResult,
@@ -116,12 +117,14 @@ function defaultProfile(session: AuthSession): UserProfile {
       currentWinStreak: 0,
     },
     ownedAvatars: [AVATARS[0].id, AVATARS[1].id],
-    ownedCardStyles: ["classic"],
+    ownedCardFronts: ["classic"],
+    ownedCardBacks: ["classic"],
     ownedTitles: ["novice"],
     ownedReactionPacks: [],
     ownedStickerPacks: [],
     title: "novice",
-    cardStyle: "classic",
+    cardFront: "classic",
+    cardBack: "classic",
     achievements: {},
     unlocked: [],
     createdAt: Date.now(),
@@ -130,16 +133,19 @@ function defaultProfile(session: AuthSession): UserProfile {
 
 /** Backfill fields on older persisted profiles so the app never crashes. */
 function migrateProfile(p: UserProfile): UserProfile {
+  const legacy = p as unknown as { ownedCardStyles?: string[]; cardStyle?: string };
   return {
     ...p,
     plan: p.plan ?? "free",
     ownedAvatars: p.ownedAvatars ?? [AVATARS[0].id],
-    ownedCardStyles: p.ownedCardStyles ?? ["classic"],
+    ownedCardFronts: p.ownedCardFronts ?? ["classic"],
+    ownedCardBacks: p.ownedCardBacks ?? legacy.ownedCardStyles ?? ["classic"],
     ownedTitles: p.ownedTitles ?? ["novice"],
     ownedReactionPacks: p.ownedReactionPacks ?? [],
     ownedStickerPacks: p.ownedStickerPacks ?? [],
     title: p.title ?? "novice",
-    cardStyle: p.cardStyle ?? "classic",
+    cardFront: p.cardFront ?? "classic",
+    cardBack: p.cardBack ?? legacy.cardStyle ?? "classic",
   };
 }
 
@@ -328,7 +334,7 @@ export class MockOnlineService implements OnlineService {
 
   async updateProfile(
     patch: Partial<
-      Pick<UserProfile, "displayName" | "avatar" | "avatarImage" | "title" | "cardStyle">
+      Pick<UserProfile, "displayName" | "avatar" | "avatarImage" | "title" | "cardFront" | "cardBack">
     >
   ) {
     const p = await this.getProfile();
@@ -756,14 +762,22 @@ export class MockOnlineService implements OnlineService {
       price: 500 + i * 150,
       preview: a.emoji,
     }));
-    const cardItems: ShopItem[] = CARD_STYLES.filter((c) => c.price > 0).map((c) => ({
+    const backItems: ShopItem[] = CARD_BACKS.filter((c) => c.price > 0).map((c) => ({
       id: c.id,
-      kind: "cardstyle",
+      kind: "cardback",
       nameFa: c.nameFa,
       nameEn: c.nameEn,
       price: c.price,
       preview: c.accent,
     }));
+    const frontItems: ShopItem[] = CARD_FRONTS.filter((c) => c.price > 0).map((c) => ({
+      id: c.id,
+      kind: "cardfront",
+      nameFa: c.nameFa,
+      nameEn: c.nameEn,
+      price: c.price,
+      preview: c.bg2,
+    }));
     const reactionItems: ShopItem[] = REACTION_PACKS.filter((r) => r.price > 0).map((r) => ({
       id: r.id,
       kind: "reactionpack",
@@ -780,7 +794,7 @@ export class MockOnlineService implements OnlineService {
       price: p.price,
       preview: p.stickers[0], // sticker id; ShopScreen renders via <Sticker>
     }));
-    return [...avatarItems, ...cardItems, ...reactionItems, ...stickerItems];
+    return [...avatarItems, ...frontItems, ...backItems, ...reactionItems, ...stickerItems];
   }
 
   async buyItem(id: string) {
@@ -788,15 +802,15 @@ export class MockOnlineService implements OnlineService {
     const items = await this.getShopItems();
     const item = items.find((i) => i.id === id);
     if (!item) return { ok: false, messageFa: "آیتم یافت نشد", messageEn: "Item not found" };
-    const owned =
-      item.kind === "avatar"
-        ? p.ownedAvatars.includes(id)
-        : item.kind === "cardstyle"
-        ? p.ownedCardStyles.includes(id)
-        : item.kind === "reactionpack"
-        ? p.ownedReactionPacks.includes(id)
-        : p.ownedStickerPacks.includes(id);
-    if (owned) return { ok: false, messageFa: "قبلاً خریداری شده", messageEn: "Already owned" };
+    const ownedMap: Record<string, string[]> = {
+      avatar: p.ownedAvatars,
+      cardfront: p.ownedCardFronts,
+      cardback: p.ownedCardBacks,
+      reactionpack: p.ownedReactionPacks,
+      stickerpack: p.ownedStickerPacks,
+    };
+    if (ownedMap[item.kind]?.includes(id))
+      return { ok: false, messageFa: "قبلاً خریداری شده", messageEn: "Already owned" };
     if (p.coins < item.price)
       return { ok: false, messageFa: "سکه کافی نیست", messageEn: "Not enough coins" };
 
@@ -804,8 +818,10 @@ export class MockOnlineService implements OnlineService {
       ...p,
       coins: p.coins - item.price,
       ownedAvatars: item.kind === "avatar" ? [...p.ownedAvatars, id] : p.ownedAvatars,
-      ownedCardStyles:
-        item.kind === "cardstyle" ? [...p.ownedCardStyles, id] : p.ownedCardStyles,
+      ownedCardFronts:
+        item.kind === "cardfront" ? [...p.ownedCardFronts, id] : p.ownedCardFronts,
+      ownedCardBacks:
+        item.kind === "cardback" ? [...p.ownedCardBacks, id] : p.ownedCardBacks,
       ownedReactionPacks:
         item.kind === "reactionpack" ? [...p.ownedReactionPacks, id] : p.ownedReactionPacks,
       ownedStickerPacks:

src/lib/online/service.ts

@@ -46,7 +46,7 @@ export interface OnlineService {
   getProfile(): Promise<UserProfile>;
   updateProfile(
     patch: Partial<
-      Pick<UserProfile, "displayName" | "avatar" | "avatarImage" | "title" | "cardStyle">
+      Pick<UserProfile, "displayName" | "avatar" | "avatarImage" | "title" | "cardFront" | "cardBack">
     >
   ): Promise<UserProfile>;
   upgradePlan(): Promise<UserProfile>;

src/lib/online/types.ts

@@ -52,12 +52,14 @@ export interface UserProfile {
 
   // cosmetics
   ownedAvatars: string[];
-  ownedCardStyles: string[];
+  ownedCardFronts: string[];
+  ownedCardBacks: string[];
   ownedTitles: string[];
   ownedReactionPacks: string[]; // purchased reaction packs
   ownedStickerPacks: string[]; // purchased sticker packs
   title: string | null; // equipped title id
-  cardStyle: string; // equipped card-back style id
+  cardFront: string; // equipped card-front style id
+  cardBack: string; // equipped card-back style id
 
   achievements: Record<string, number>; // achievementId -> progress count
   unlocked: string[]; // achievementId list already unlocked
@@ -124,14 +126,30 @@ export interface TitleDef {
   hintEn: string;
 }
 
-export interface CardStyleDef {
+export interface CardBackDef {
   id: string;
   nameFa: string;
   nameEn: string;
   c1: string; // back gradient start
   c2: string; // back gradient end
   accent: string; // pattern/border accent
-  price: number; // 0 = free/default
+  price: number; // >0 = purchasable
+  default?: boolean;
+  unlockRating?: number;
+  unlockWins?: number;
+}
+
+export interface CardFrontDef {
+  id: string;
+  nameFa: string;
+  nameEn: string;
+  bg1: string; // face gradient start
+  bg2: string; // face gradient end
+  border: string; // face border color
+  price: number;
+  default?: boolean;
+  unlockRating?: number;
+  unlockWins?: number;
 }
 
 /* --------------------- Reactions (Sheklak / شکلک) -------------------- */
@@ -293,7 +311,12 @@ export interface LeaderboardEntry {
 
 /* ------------------------------- Shop -------------------------------- */
 
-export type ShopItemKind = "avatar" | "cardstyle" | "reactionpack" | "stickerpack";
+export type ShopItemKind =
+  | "avatar"
+  | "cardfront"
+  | "cardback"
+  | "reactionpack"
+  | "stickerpack";
 
 export interface ShopItem {
   id: string;