모바일 필터 바텀시트 UI 적용

- FilterSheet 컴포넌트 신규: 바텀시트로 올라오는 필터 선택 UI
- 장르/가격/지역 필터 모두 네이티브 select 대신 바텀시트 사용
- 카테고리별 그룹핑 + sticky 헤더 + 선택 체크 표시
- slide-up 애니메이션 추가

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/app/globals.css

@@ -101,3 +101,12 @@ html, body, #__next {
 .safe-area-bottom {
   padding-bottom: env(safe-area-inset-bottom, 0px);
 }
+
+/* Filter sheet slide-up animation */
+@keyframes slide-up {
+  from { transform: translateY(100%); }
+  to { transform: translateY(0); }
+}
+.animate-slide-up {
+  animation: slide-up 0.25s ease-out;
+}

frontend/src/app/page.tsx

@@ -12,6 +12,7 @@ import RestaurantList from "@/components/RestaurantList";
 import RestaurantDetail from "@/components/RestaurantDetail";
 import MyReviewsList from "@/components/MyReviewsList";
 import BottomSheet from "@/components/BottomSheet";
+import FilterSheet, { FilterOption } from "@/components/FilterSheet";
 import { getCuisineIcon } from "@/lib/cuisine-icons";
 import Icon from "@/components/Icon";
 
@@ -187,6 +188,7 @@ export default function Home() {
   const [countryFilter, setCountryFilter] = useState("");
   const [cityFilter, setCityFilter] = useState("");
   const [districtFilter, setDistrictFilter] = useState("");
+  const [openSheet, setOpenSheet] = useState<"cuisine" | "price" | "country" | "city" | "district" | null>(null);
   const [regionFlyTo, setRegionFlyTo] = useState<FlyTo | null>(null);
   const [showFavorites, setShowFavorites] = useState(false);
   const [showMyReviews, setShowMyReviews] = useState(false);
@@ -247,6 +249,34 @@ export default function Home() {
     });
   }, [restaurants, isSearchResult, channelFilter, cuisineFilter, priceFilter, countryFilter, cityFilter, districtFilter, boundsFilterOn, mapBounds, userLoc]);
 
+  // FilterSheet option builders
+  const cuisineOptions = useMemo<FilterOption[]>(() => {
+    const opts: FilterOption[] = [];
+    for (const g of CUISINE_TAXONOMY) {
+      opts.push({ label: `${g.category} 전체`, value: g.category, group: g.category });
+      for (const item of g.items) {
+        opts.push({ label: item, value: `${g.category}|${item}`, group: g.category });
+      }
+    }
+    return opts;
+  }, []);
+
+  const priceOptions = useMemo<FilterOption[]>(() =>
+    PRICE_GROUPS.map((g) => ({ label: g.label, value: g.label })),
+  []);
+
+  const countryOptions = useMemo<FilterOption[]>(() =>
+    countries.map((c) => ({ label: c, value: c })),
+  [countries]);
+
+  const cityOptions = useMemo<FilterOption[]>(() =>
+    cities.map((c) => ({ label: c, value: c })),
+  [cities]);
+
+  const districtOptions = useMemo<FilterOption[]>(() =>
+    districts.map((d) => ({ label: d, value: d })),
+  [districts]);
+
   // Set desktop default to map mode on mount + get user location
   useEffect(() => {
     if (window.innerWidth >= 768) setViewMode("map");
@@ -957,49 +987,30 @@ export default function Home() {
           <div className="space-y-1.5">
             {/* Line 1: 음식 장르 + 가격 + 결과수 */}
             <div className="flex items-center gap-1.5 text-xs">
-              <div className={`relative inline-flex items-center rounded-full px-3 py-1.5 ${
-                cuisineFilter ? "bg-brand-50 dark:bg-brand-900/30 ring-1 ring-brand-300 dark:ring-brand-700" : "bg-gray-100 dark:bg-gray-800"
-              }`}>
+              <button
+                onClick={() => setOpenSheet("cuisine")}
+                className={`inline-flex items-center rounded-full px-3 py-1.5 ${
+                  cuisineFilter ? "bg-brand-50 dark:bg-brand-900/30 ring-1 ring-brand-300 dark:ring-brand-700" : "bg-gray-100 dark:bg-gray-800"
+                }`}
+              >
                 <Icon name="restaurant" size={14} className={`mr-1 ${cuisineFilter ? "text-brand-500" : "text-gray-400"}`} />
-                <select
-                  value={cuisineFilter}
-                  onChange={(e) => { setCuisineFilter(e.target.value); if (e.target.value) setBoundsFilterOn(false); }}
-                  className={`bg-transparent border-none outline-none appearance-none pr-4 cursor-pointer ${
-                    cuisineFilter ? "text-brand-600 dark:text-brand-400 font-medium" : "text-gray-500 dark:text-gray-400"
-                  }`}
-                >
-                  <option value="">장르</option>
-                  {CUISINE_TAXONOMY.map((g) => (
-                    <optgroup key={g.category} label={`── ${g.category} ──`}>
-                      <option value={g.category}>{g.category} 전체</option>
-                      {g.items.map((item) => (
-                        <option key={`${g.category}|${item}`} value={`${g.category}|${item}`}>
-                          {item}
-                        </option>
-                      ))}
-                    </optgroup>
-                  ))}
-                </select>
-                <Icon name="expand_more" size={14} className="absolute right-2 text-gray-400 pointer-events-none" />
-              </div>
-              <div className={`relative inline-flex items-center rounded-full px-3 py-1.5 ${
-                priceFilter ? "bg-brand-50 dark:bg-brand-900/30 ring-1 ring-brand-300 dark:ring-brand-700" : "bg-gray-100 dark:bg-gray-800"
-              }`}>
+                <span className={cuisineFilter ? "text-brand-600 dark:text-brand-400 font-medium" : "text-gray-500 dark:text-gray-400"}>
+                  {cuisineFilter ? (cuisineFilter.includes("|") ? cuisineFilter.split("|")[1] : cuisineFilter) : "장르"}
+                </span>
+                <Icon name="expand_more" size={14} className="ml-0.5 text-gray-400" />
+              </button>
+              <button
+                onClick={() => setOpenSheet("price")}
+                className={`inline-flex items-center rounded-full px-3 py-1.5 ${
+                  priceFilter ? "bg-brand-50 dark:bg-brand-900/30 ring-1 ring-brand-300 dark:ring-brand-700" : "bg-gray-100 dark:bg-gray-800"
+                }`}
+              >
                 <Icon name="payments" size={14} className={`mr-1 ${priceFilter ? "text-brand-500" : "text-gray-400"}`} />
-                <select
-                  value={priceFilter}
-                  onChange={(e) => { setPriceFilter(e.target.value); if (e.target.value) setBoundsFilterOn(false); }}
-                  className={`bg-transparent border-none outline-none appearance-none pr-4 cursor-pointer ${
-                    priceFilter ? "text-brand-600 dark:text-brand-400 font-medium" : "text-gray-500 dark:text-gray-400"
-                  }`}
-                >
-                  <option value="">가격</option>
-                  {PRICE_GROUPS.map((g) => (
-                    <option key={g.label} value={g.label}>{g.label}</option>
-                  ))}
-                </select>
-                <Icon name="expand_more" size={14} className="absolute right-2 text-gray-400 pointer-events-none" />
-              </div>
+                <span className={priceFilter ? "text-brand-600 dark:text-brand-400 font-medium" : "text-gray-500 dark:text-gray-400"}>
+                  {priceFilter || "가격"}
+                </span>
+                <Icon name="expand_more" size={14} className="ml-0.5 text-gray-400" />
+              </button>
               {(cuisineFilter || priceFilter) && (
                 <button onClick={() => { setCuisineFilter(""); setPriceFilter(""); }} className="text-gray-400 hover:text-brand-500">
                   <Icon name="close" size={14} />
@@ -1009,61 +1020,43 @@ export default function Home() {
             </div>
             {/* Line 2: 나라 + 시 + 구 + 내위치 */}
             <div className="flex items-center gap-1.5 text-xs">
-              <div className={`relative inline-flex items-center rounded-full px-3 py-1.5 ${
-                countryFilter ? "bg-brand-50 dark:bg-brand-900/30 ring-1 ring-brand-300 dark:ring-brand-700" : "bg-gray-100 dark:bg-gray-800"
-              }`}>
+              <button
+                onClick={() => setOpenSheet("country")}
+                className={`inline-flex items-center rounded-full px-3 py-1.5 ${
+                  countryFilter ? "bg-brand-50 dark:bg-brand-900/30 ring-1 ring-brand-300 dark:ring-brand-700" : "bg-gray-100 dark:bg-gray-800"
+                }`}
+              >
                 <Icon name="public" size={14} className={`mr-1 ${countryFilter ? "text-brand-500" : "text-gray-400"}`} />
-                <select
-                  value={countryFilter}
-                  onChange={(e) => handleCountryChange(e.target.value)}
-                  className={`bg-transparent border-none outline-none appearance-none pr-4 cursor-pointer ${
-                    countryFilter ? "text-brand-600 dark:text-brand-400 font-medium" : "text-gray-500 dark:text-gray-400"
+                <span className={countryFilter ? "text-brand-600 dark:text-brand-400 font-medium" : "text-gray-500 dark:text-gray-400"}>
+                  {countryFilter || "나라"}
+                </span>
+                <Icon name="expand_more" size={14} className="ml-0.5 text-gray-400" />
+              </button>
+              {countryFilter && cities.length > 0 && (
+                <button
+                  onClick={() => setOpenSheet("city")}
+                  className={`inline-flex items-center rounded-full px-3 py-1.5 ${
+                    cityFilter ? "bg-brand-50 dark:bg-brand-900/30 ring-1 ring-brand-300 dark:ring-brand-700" : "bg-gray-100 dark:bg-gray-800"
                   }`}
                 >
-                  <option value="">나라</option>
-                  {countries.map((c) => (
-                    <option key={c} value={c}>{c}</option>
-                  ))}
-                </select>
-                <Icon name="expand_more" size={14} className="absolute right-2 text-gray-400 pointer-events-none" />
-              </div>
-              {countryFilter && cities.length > 0 && (
-                <div className={`relative inline-flex items-center rounded-full px-3 py-1.5 ${
-                  cityFilter ? "bg-brand-50 dark:bg-brand-900/30 ring-1 ring-brand-300 dark:ring-brand-700" : "bg-gray-100 dark:bg-gray-800"
-                }`}>
-                  <select
-                    value={cityFilter}
-                    onChange={(e) => handleCityChange(e.target.value)}
-                    className={`bg-transparent border-none outline-none appearance-none pr-4 cursor-pointer ${
-                      cityFilter ? "text-brand-600 dark:text-brand-400 font-medium" : "text-gray-500 dark:text-gray-400"
-                    }`}
-                  >
-                    <option value="">시/도</option>
-                    {cities.map((c) => (
-                      <option key={c} value={c}>{c}</option>
-                    ))}
-                  </select>
-                  <Icon name="expand_more" size={14} className="absolute right-2 text-gray-400 pointer-events-none" />
-                </div>
+                  <span className={cityFilter ? "text-brand-600 dark:text-brand-400 font-medium" : "text-gray-500 dark:text-gray-400"}>
+                    {cityFilter || "시/도"}
+                  </span>
+                  <Icon name="expand_more" size={14} className="ml-0.5 text-gray-400" />
+                </button>
               )}
               {cityFilter && districts.length > 0 && (
-                <div className={`relative inline-flex items-center rounded-full px-3 py-1.5 ${
-                  districtFilter ? "bg-brand-50 dark:bg-brand-900/30 ring-1 ring-brand-300 dark:ring-brand-700" : "bg-gray-100 dark:bg-gray-800"
-                }`}>
-                  <select
-                    value={districtFilter}
-                    onChange={(e) => handleDistrictChange(e.target.value)}
-                    className={`bg-transparent border-none outline-none appearance-none pr-4 cursor-pointer ${
-                      districtFilter ? "text-brand-600 dark:text-brand-400 font-medium" : "text-gray-500 dark:text-gray-400"
-                    }`}
-                  >
-                    <option value="">구/군</option>
-                    {districts.map((d) => (
-                      <option key={d} value={d}>{d}</option>
-                    ))}
-                  </select>
-                  <Icon name="expand_more" size={14} className="absolute right-2 text-gray-400 pointer-events-none" />
-                </div>
+                <button
+                  onClick={() => setOpenSheet("district")}
+                  className={`inline-flex items-center rounded-full px-3 py-1.5 ${
+                    districtFilter ? "bg-brand-50 dark:bg-brand-900/30 ring-1 ring-brand-300 dark:ring-brand-700" : "bg-gray-100 dark:bg-gray-800"
+                  }`}
+                >
+                  <span className={districtFilter ? "text-brand-600 dark:text-brand-400 font-medium" : "text-gray-500 dark:text-gray-400"}>
+                    {districtFilter || "구/군"}
+                  </span>
+                  <Icon name="expand_more" size={14} className="ml-0.5 text-gray-400" />
+                </button>
               )}
               {countryFilter && (
                 <button onClick={() => { setCountryFilter(""); setCityFilter(""); setDistrictFilter(""); setRegionFlyTo(null); }} className="text-gray-400 hover:text-brand-500">
@@ -1313,6 +1306,47 @@ export default function Home() {
           SDJ Labs Co., Ltd.
         </span>
       </footer>
+      {/* Mobile Filter Sheets */}
+      <FilterSheet
+        open={openSheet === "cuisine"}
+        onClose={() => setOpenSheet(null)}
+        title="음식 장르"
+        options={cuisineOptions}
+        value={cuisineFilter}
+        onChange={(v) => { setCuisineFilter(v); if (v) setBoundsFilterOn(false); }}
+      />
+      <FilterSheet
+        open={openSheet === "price"}
+        onClose={() => setOpenSheet(null)}
+        title="가격대"
+        options={priceOptions}
+        value={priceFilter}
+        onChange={(v) => { setPriceFilter(v); if (v) setBoundsFilterOn(false); }}
+      />
+      <FilterSheet
+        open={openSheet === "country"}
+        onClose={() => setOpenSheet(null)}
+        title="나라"
+        options={countryOptions}
+        value={countryFilter}
+        onChange={handleCountryChange}
+      />
+      <FilterSheet
+        open={openSheet === "city"}
+        onClose={() => setOpenSheet(null)}
+        title="시/도"
+        options={cityOptions}
+        value={cityFilter}
+        onChange={handleCityChange}
+      />
+      <FilterSheet
+        open={openSheet === "district"}
+        onClose={() => setOpenSheet(null)}
+        title="구/군"
+        options={districtOptions}
+        value={districtFilter}
+        onChange={handleDistrictChange}
+      />
     </div>
   );
 }

frontend/src/components/FilterSheet.tsx

@@ -0,0 +1,112 @@
+"use client";
+
+import { useEffect, useRef } from "react";
+import Icon from "@/components/Icon";
+
+export interface FilterOption {
+  label: string;
+  value: string;
+  group?: string;
+}
+
+interface FilterSheetProps {
+  open: boolean;
+  onClose: () => void;
+  title: string;
+  options: FilterOption[];
+  value: string;
+  onChange: (value: string) => void;
+}
+
+export default function FilterSheet({ open, onClose, title, options, value, onChange }: FilterSheetProps) {
+  const sheetRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    if (!open) return;
+    document.body.style.overflow = "hidden";
+    return () => { document.body.style.overflow = ""; };
+  }, [open]);
+
+  // Group options by group field
+  const grouped = options.reduce<Record<string, FilterOption[]>>((acc, opt) => {
+    const key = opt.group || "";
+    if (!acc[key]) acc[key] = [];
+    acc[key].push(opt);
+    return acc;
+  }, {});
+  const groups = Object.keys(grouped);
+
+  const handleSelect = (v: string) => {
+    onChange(v);
+    onClose();
+  };
+
+  if (!open) return null;
+
+  return (
+    <>
+      {/* Backdrop */}
+      <div
+        className="fixed inset-0 z-[60] bg-black/30 md:hidden"
+        onClick={onClose}
+      />
+
+      {/* Sheet */}
+      <div
+        ref={sheetRef}
+        className="fixed bottom-0 left-0 right-0 z-[61] md:hidden bg-surface rounded-t-2xl shadow-2xl max-h-[70vh] flex flex-col animate-slide-up"
+      >
+        {/* Handle */}
+        <div className="flex justify-center pt-2 pb-1 shrink-0">
+          <div className="w-10 h-1 bg-gray-300 dark:bg-gray-600 rounded-full" />
+        </div>
+
+        {/* Header */}
+        <div className="flex items-center justify-between px-4 py-2 border-b border-gray-100 dark:border-gray-800 shrink-0">
+          <h3 className="font-bold text-base text-gray-900 dark:text-gray-100">{title}</h3>
+          <button onClick={onClose} className="p-1 text-gray-400 hover:text-gray-600">
+            <Icon name="close" size={20} />
+          </button>
+        </div>
+
+        {/* Options */}
+        <div className="flex-1 overflow-y-auto overscroll-contain pb-safe">
+          {/* 전체(초기화) */}
+          <button
+            onClick={() => handleSelect("")}
+            className={`w-full text-left px-4 py-3 flex items-center justify-between border-b border-gray-50 dark:border-gray-800/50 ${
+              !value ? "text-brand-600 dark:text-brand-400 font-medium bg-brand-50/50 dark:bg-brand-900/20" : "text-gray-700 dark:text-gray-300"
+            }`}
+          >
+            <span>전체</span>
+            {!value && <Icon name="check" size={18} className="text-brand-500" />}
+          </button>
+
+          {groups.map((group) => (
+            <div key={group}>
+              {group && (
+                <div className="px-4 py-2 text-[11px] font-semibold text-gray-400 dark:text-gray-500 uppercase tracking-wider bg-gray-50 dark:bg-gray-800/50 sticky top-0">
+                  {group}
+                </div>
+              )}
+              {grouped[group].map((opt) => (
+                <button
+                  key={opt.value}
+                  onClick={() => handleSelect(opt.value)}
+                  className={`w-full text-left px-4 py-3 flex items-center justify-between border-b border-gray-50 dark:border-gray-800/50 active:bg-gray-100 dark:active:bg-gray-800 ${
+                    value === opt.value
+                      ? "text-brand-600 dark:text-brand-400 font-medium bg-brand-50/50 dark:bg-brand-900/20"
+                      : "text-gray-700 dark:text-gray-300"
+                  }`}
+                >
+                  <span className="text-sm">{opt.label}</span>
+                  {value === opt.value && <Icon name="check" size={18} className="text-brand-500" />}
+                </button>
+              ))}
+            </div>
+          ))}
+        </div>
+      </div>
+    </>
+  );
+}