diff --git a/src/app/core_attendance/layout.js b/src/app/core_attendance/layout.js
new file mode 100644
index 0000000..0315c1b
--- /dev/null
+++ b/src/app/core_attendance/layout.js
@@ -0,0 +1,11 @@
+import { Suspense } from "react";
+import Loader from "@/components/ui/common/Loader.jsx";
+
+export const metadata = {
+    title: "Core Attendance",
+    description: "GDGoC INHA Core Attendance Management",
+};
+
+export default function CoreAttendanceLayout({ children }) {
+    return <Suspense fallback={<Loader />}>{children}</Suspense>;
+}
\ No newline at end of file
diff --git a/src/app/core_attendance/page.jsx b/src/app/core_attendance/page.jsx
new file mode 100644
index 0000000..6640bcf
--- /dev/null
+++ b/src/app/core_attendance/page.jsx
@@ -0,0 +1,358 @@
+'use client';
+
+import {useEffect, useMemo, useState} from 'react';
+import axios from 'axios';
+import {Button, Card, CardBody, Checkbox, Divider, Input, Select, SelectItem} from '@nextui-org/react';
+
+/** ===== API 클라이언트 ===== */
+const API = axios.create({
+    baseURL: (process.env.NEXT_PUBLIC_BASE_API_URL?.replace(/\/$/, '') || 'http://localhost:8080') + '/api/v1/core-attendance/meetings',
+    timeout: 15000,
+    withCredentials: true,
+});
+
+const api = {
+    // Dates
+    getDates: async () => (await API.get(`/`)).data.data, // { dates: [...] }
+    addDate: async (date) => (await API.post(`/`, {date})).data.data,
+    deleteDate: async (date) => (await API.delete(`/${date}`)).data.data,
+
+    // Teams
+    getTeams: async () => (await API.get(`/teams`)).data.data,
+
+    // Members with presence
+    getMembers: async (date, teamId) => (await API.get(`/${date}/members`, {params: teamId ? {team: teamId} : {}})).data.data,
+
+    // Batch save attendance
+    saveAttendance: async (date, userIds, present, teamId) => (await API.put(`/${date}/attendance`, {
+        userIds,
+        present
+    }, {params: teamId ? {team: teamId} : {}})).data.data,
+
+    // Summary
+    summary: async (date, teamId) => (await API.get(`/${date}/summary`, {params: teamId ? {team: teamId} : {}})).data.data,
+};
+
+/** ===== 유틸 ===== */
+const ymd = (d = new Date()) => d.toISOString().slice(0, 10);
+const getQS = (k) => typeof window !== 'undefined' ? new URL(window.location.href).searchParams.get(k) || '' : '';
+const setQS = (entries) => {
+    if (typeof window === 'undefined') return;
+    const u = new URL(window.location.href);
+    Object.entries(entries).forEach(([k, v]) => (v ? u.searchParams.set(k, v) : u.searchParams.delete(k)));
+    window.history.replaceState({}, '', u.toString());
+};
+
+export default function AttendancePage() {
+    // URL state
+    const [date, setDate] = useState(typeof window !== 'undefined' ? getQS('date') || ymd() : ymd());
+    const [teamId, setTeamId] = useState(typeof window !== 'undefined' ? getQS('teamId') : '');
+
+    // data
+    const [dates, setDates] = useState([]);
+    const [teams, setTeams] = useState([]);
+    const [members, setMembers] = useState([]);
+    const [summary, setSummary] = useState(null);
+    const [filter, setFilter] = useState('');
+
+    // UI
+    const [presentSet, setPresentSet] = useState(new Set());
+    const [dirty, setDirty] = useState(false);
+
+    const selectedTeam = useMemo(() => teams.find((t) => t.id === teamId) ?? teams[0], [teams, teamId]);
+
+    const filteredMembers = useMemo(() => {
+        const base = members;
+        const q = filter.trim();
+        if (!q) return base;
+        return base.filter((m) => m.name.includes(q));
+    }, [members, filter]);
+
+    /** URL 동기화 */
+    useEffect(() => {
+        setQS({date, teamId: teamId || undefined});
+    }, [date, teamId]);
+
+    /** 날짜 로드 */
+    useEffect(() => {
+        (async () => {
+            try {
+                const dl = await api.getDates(); // { dates: [...] }
+                setDates(dl.dates);
+                if (!dl.dates.includes(date) && dl.dates.length > 0) setDate(dl.dates[0]);
+            } catch {
+                alert('날짜 목록을 불러오지 못했습니다.');
+            }
+        })();
+        // eslint-disable-next-line react-hooks/exhaustive-deps
+    }, []);
+
+    /** 팀 로드 */
+    useEffect(() => {
+        (async () => {
+            try {
+                const list = await api.getTeams();
+                setTeams(list);
+                if (list.length && !list.find((t) => t.id === teamId)) setTeamId(list[0].id);
+            } catch {
+                alert('팀 목록을 불러오지 못했습니다.');
+            }
+        })();
+        // eslint-disable-next-line react-hooks/exhaustive-deps
+    }, []);
+
+    /** 특정 날짜의 팀원 + 출석 로드 */
+    useEffect(() => {
+        (async () => {
+            if (!date || !selectedTeam) return;
+            try {
+                const rows = await api.getMembers(date, selectedTeam.id);
+                setMembers(rows);
+                const init = new Set();
+                rows.forEach((r) => r.present && init.add(String(r.userId)));
+                setPresentSet(init);
+                setDirty(false);
+            } catch {
+                setMembers([]);
+                setPresentSet(new Set());
+                setDirty(false);
+            }
+        })();
+    }, [date, selectedTeam?.id]); // eslint-disable-line react-hooks/exhaustive-deps
+
+    /** 요약 로드 */
+    useEffect(() => {
+        (async () => {
+            if (!date) return;
+            try {
+                const s = await api.summary(date, selectedTeam?.id);
+                setSummary(s);
+            } catch {
+                setSummary(null);
+            }
+        })();
+    }, [date, selectedTeam?.id]); // eslint-disable-line react-hooks/exhaustive-deps
+
+    /** 날짜 조작 */
+    const addToday = async () => {
+        try {
+            const d = ymd();
+            await api.addDate(d);
+            const dl = await api.getDates();
+            setDates(dl.dates);
+            setDate(d);
+        } catch {
+            alert('날짜 추가에 실패했습니다.');
+        }
+    };
+
+    const removeDate = async (d) => {
+        try {
+            await api.deleteDate(d);
+            const dl = await api.getDates();
+            setDates(dl.dates);
+            if (d === date) setDate(dl.dates[0] ?? ymd());
+        } catch {
+            alert('날짜 삭제에 실패했습니다.');
+        }
+    };
+
+    /** 개별 토글: 배치 API로 “단건” 반영 */
+    const toggleMember = async (m) => {
+        if (!selectedTeam) return;
+        const id = String(m.id ?? m.userId);
+        const next = !presentSet.has(id);
+
+        // UI 낙관적 업데이트
+        setPresentSet((prev) => {
+            const n = new Set(prev);
+            next ? n.add(id) : n.delete(id);
+            return n;
+        });
+        setDirty(true);
+
+        try {
+            await api.saveAttendance(date, [id], next, selectedTeam.id);
+            await refreshSummary();
+        } catch {
+            alert('출석 변경에 실패했습니다.');
+            // 롤백
+            setPresentSet((prev) => {
+                const n = new Set(prev);
+                next ? n.delete(id) : n.add(id);
+                return n;
+            });
+        }
+    };
+
+    /** 전체 체크/해제(로컬) */
+    const checkAll = (value) => {
+        if (!selectedTeam) return;
+        if (value) {
+            setPresentSet(new Set(members.map((m) => String(m.userId))));
+        } else {
+            setPresentSet(new Set());
+        }
+        setDirty(true);
+    };
+
+    /** 저장(스냅샷) – present=true & present=false 두 번 호출 */
+    const saveSnapshot = async () => {
+        if (!selectedTeam) return;
+        const allIds = members.map((m) => String(m.userId));
+        const presentIds = allIds.filter((id) => presentSet.has(id));
+        const absentIds = allIds.filter((id) => !presentSet.has(id));
+
+        try {
+            if (presentIds.length) {
+                await api.saveAttendance(date, presentIds, true, selectedTeam.id);
+            }
+            if (absentIds.length) {
+                await api.saveAttendance(date, absentIds, false, selectedTeam.id);
+            }
+            setDirty(false);
+            await refreshSummary();
+            alert('저장되었습니다.');
+        } catch {
+            alert('저장 중 오류가 발생했습니다.');
+        }
+    };
+
+    const refreshSummary = async () => {
+        try {
+            setSummary(await api.summary(date, selectedTeam?.id));
+        } catch {
+            setSummary(null);
+        }
+    };
+
+    return (<div className="flex flex-col max-w-[1100px] mx-auto min-h-[100svh] py-16 px-6">
+            <h1 className="font-bold mb-6 text-4xl tablet:text-3xl mobile:text-2xl">출석 관리</h1>
+
+            <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
+                {/* 날짜 */}
+                <Card>
+                    <CardBody className="gap-3">
+                        <div className="flex items-center justify-between">
+                            <b>날짜</b>
+                            <Button size="sm" color="primary" onPress={addToday}>
+                                오늘 추가
+                            </Button>
+                        </div>
+                        <Input type="date" value={date} onChange={(e) => setDate(e.target.value)}/>
+                        <Divider/>
+                        <div className="max-h-[180px] overflow-auto space-y-2">
+                            {dates.map((d) => (<div key={d} className="flex items-center justify-between">
+                                    <Button size="sm" variant="light" onPress={() => setDate(d)}>
+                                        {d === date ? <b>{d}</b> : d}
+                                    </Button>
+                                    <Button size="sm" color="danger" variant="flat" onPress={() => removeDate(d)}>
+                                        삭제
+                                    </Button>
+                                </div>))}
+                            {dates.length === 0 && (<div className="text-sm text-foreground-500">등록된 날짜가 없습니다.</div>)}
+                        </div>
+                    </CardBody>
+                </Card>
+
+                {/* 팀 선택 */}
+                <Card>
+                    <CardBody className="gap-3">
+                        <div className="flex items-center justify-between">
+                            <b>팀 선택</b>
+                            <Button
+                                size="sm"
+                                color="primary"
+                                variant="flat"
+                                onPress={saveSnapshot}
+                                isDisabled={!dirty || !members.length}
+                            >
+                                저장{dirty ? ' *' : ''}
+                            </Button>
+                        </div>
+
+                        <Select
+                            label="팀"
+                            selectedKeys={selectedTeam?.id ? new Set([selectedTeam.id]) : new Set()}
+                            onSelectionChange={(keys) => {
+                                const first = Array.from(keys || [])[0] ?? '';
+                                setTeamId(String(first));
+                                setQS({teamId: first ? String(first) : undefined});
+                            }}
+                            variant="bordered"
+                        >
+                            {teams.map((t) => (<SelectItem key={t.id} value={t.id}>
+                                    {t.name} {t.lead ? `(리드: ${t.lead})` : ''}
+                                </SelectItem>))}
+                        </Select>
+
+                        <div className="flex gap-2">
+                            <Button size="sm" onPress={() => checkAll(true)} color="success" variant="flat">
+                                전체 체크
+                            </Button>
+                            <Button size="sm" onPress={() => checkAll(false)} color="warning" variant="flat">
+                                전체 해제
+                            </Button>
+                        </div>
+                    </CardBody>
+                </Card>
+
+                {/* 요약 */}
+                <Card>
+                    <CardBody className="gap-3">
+                        <b>요약</b>
+                        {summary ? (<div className="text-sm">
+                                <div className="mb-2">
+                                    전체 {summary.present} / {summary.total}
+                                </div>
+                                <Divider/>
+                                <div className="mt-2 space-y-1">
+                                    {summary.perTeam.map((ts) => (
+                                        <div key={ts.teamId} className="flex items-center justify-between">
+                                            <span>{ts.teamName}</span>
+                                            <span>
+                        {ts.present} / {ts.total}
+                      </span>
+                                        </div>))}
+                                </div>
+                            </div>) : (<div className="text-foreground-500 text-sm">로딩...</div>)}
+                    </CardBody>
+                </Card>
+            </div>
+
+            {/* 팀원 목록 */}
+            <Card className="mt-6">
+                <CardBody className="gap-3">
+                    <div className="flex items-center justify-between">
+                        <div>
+                            <b>팀원</b>
+                            <div className="text-xs text-foreground-500">
+                                {date} · {selectedTeam?.name ?? '-'}
+                            </div>
+                        </div>
+                        <div className="flex gap-2">
+                            <Input placeholder="팀원 검색" value={filter} onValueChange={setFilter} size="sm"/>
+                        </div>
+                    </div>
+
+                    <Divider/>
+
+                    <div className="max-h-[420px] overflow-auto">
+                        {filteredMembers.map((m) => {
+                            const id = String(m.userId);
+                            const checked = presentSet.has(id);
+                            return (<div key={id} className="flex items-center justify-between py-2">
+                                    <div className="flex items-center gap-3">
+                                        <Checkbox isSelected={checked} onValueChange={() => toggleMember({userId: id})}>
+                                            {m.name}
+                                        </Checkbox>
+                                    </div>
+                                </div>);
+                        })}
+                        {filteredMembers.length === 0 && (
+                            <div className="text-sm text-foreground-500 py-3">팀원이 없습니다.</div>)}
+                    </div>
+                </CardBody>
+            </Card>
+        </div>);
+}
\ No newline at end of file