* { box-sizing: border-box; }
/* 이 파일의 여러 클래스(.modal/.room-active/.room-empty 등)가 display를 직접 지정하는데,
   author CSS가 같은 속성에 대해 브라우저 기본 [hidden] { display:none } 규칙보다 우선순위가
   높아서 hidden 속성이 무시되는 문제가 있었음(실측 확인 - 새 대화 모달이 항상 떠 있었음).
   !important로 hidden을 항상 최우선 적용해 고침. */
[hidden] { display: none !important; }
html, body { height: 100%; margin: 0; }
body {
  font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Malgun Gothic", sans-serif;
  background: #F2F4F8;
  color: #1A1D27;
  -webkit-font-smoothing: antialiased;
}
button { font-family: inherit; cursor: pointer; }
input { font-family: inherit; outline: none; }

.app-shell { height: 100vh; display: flex; flex-direction: column; }

.app-header {
  flex: none; height: 52px; display: flex; align-items: center; gap: 12px;
  padding: 0 16px; background: #FFFFFF; border-bottom: 1px solid #DDE1E9;
}
.app-title { font-size: 15px; font-weight: 700; color: #1A1D27; }
.app-header-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.my-email { font-size: 12px; color: #4D5566; }
.btn-ghost {
  height: 28px; padding: 0 12px; border: 1px solid #DDE1E9; border-radius: 6px;
  background: #FFFFFF; color: #1A1D27; font-size: 12.5px;
}
.btn-ghost:hover { border-color: #1565C0; color: #1565C0; background: rgba(21,101,192,0.06); }

.app-body { flex: 1; min-height: 0; display: flex; }

.room-list {
  width: 300px; flex: none; display: flex; flex-direction: column;
  background: #F8F9FC; border-right: 1px solid #DDE1E9;
}
.room-list-head {
  flex: none; padding: 12px 14px; display: flex; align-items: center;
  border-bottom: 1px solid #DDE1E9;
}
.room-list-title { font-size: 13.5px; font-weight: 700; color: #1A1D27; }
.btn-icon {
  margin-left: auto; width: 28px; height: 28px; border: 1px solid #DDE1E9; border-radius: 8px;
  background: #FFFFFF; color: #4D5566; font-size: 16px; line-height: 1; display: flex;
  align-items: center; justify-content: center;
}
.btn-icon:hover { border-color: #1565C0; color: #1565C0; }

.room-list-items { flex: 1; min-height: 0; overflow-y: auto; padding: 6px; }
.room-item {
  width: 100%; display: flex; align-items: center; gap: 10px; padding: 9px 10px;
  border: none; border-radius: 8px; cursor: pointer; text-align: left; background: transparent;
  box-sizing: border-box;
}
.room-item:hover { background: #EEF1F7; }
.room-item.active { background: #E3EEFA; }
.room-item-body { display: flex; flex-direction: column; gap: 2px; min-width: 0; flex: 1; }
.room-item-name { font-size: 12.5px; font-weight: 500; color: #1A1D27; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.room-item-preview { font-size: 11.5px; color: #4D5566; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.room-item-unread {
  flex: none; min-width: 17px; height: 17px; padding: 0 5px; border-radius: 999px;
  background: #F03E3E; color: #FFFFFF; font-size: 10px; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
}
.room-list-empty { padding: 40px 16px; text-align: center; font-size: 12px; color: #8C95A8; }

.avatar {
  display: flex; align-items: center; justify-content: center; border-radius: 999px;
  background: #8C95A8; color: #FFFFFF; font-weight: 600; flex: none; letter-spacing: -0.2px;
}
.avatar-sm { width: 30px; height: 30px; font-size: 11px; }
.avatar-md { width: 32px; height: 32px; font-size: 11.5px; }

.room-view { flex: 1; min-width: 0; display: flex; flex-direction: column; background: #FFFFFF; }
.room-empty { flex: 1; display: flex; align-items: center; justify-content: center; color: #8C95A8; font-size: 13px; }

.room-active { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.room-header {
  flex: none; height: 56px; display: flex; align-items: center; gap: 10px;
  padding: 0 16px; border-bottom: 1px solid #DDE1E9;
}
.room-header-name { font-size: 13.5px; font-weight: 600; color: #1A1D27; }
.back-btn {
  display: none; width: 28px; height: 28px; border: none; border-radius: 8px;
  background: transparent; color: #4D5566; font-size: 17px; line-height: 1; flex: none;
  align-items: center; justify-content: center;
}
.back-btn:hover { background: #F2F4F8; color: #1565C0; }

.messages { flex: 1; min-height: 0; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.msg-row { display: flex; gap: 8px; align-items: flex-end; }
.msg-row.mine { flex-direction: row-reverse; }
.msg-bubble {
  padding: 9px 12px; border-radius: 3px 12px 12px 12px; background: #F2F4F8; color: #1A1D27;
  font-size: 12.5px; line-height: 1.6; word-break: break-word; max-width: min(72%, 440px);
}
.msg-row.mine .msg-bubble { border-radius: 12px 3px 12px 12px; background: #1565C0; color: #FFFFFF; }
.msg-time { flex: none; font-size: 10px; color: #8C95A8; padding-bottom: 2px; white-space: nowrap; }

.compose {
  flex: none; border-top: 1px solid #DDE1E9; padding: 10px 14px; display: flex; gap: 8px;
  background: #FFFFFF;
}
.compose-input {
  flex: 1; min-width: 0; height: 36px; border: 1px solid #DDE1E9; border-radius: 10px;
  padding: 0 12px; font-size: 13px; color: #1A1D27; background: #FFFFFF;
}
.compose-input:focus { border-color: #1565C0; }
.btn-send {
  flex: none; height: 36px; padding: 0 16px; border: none; border-radius: 10px;
  background: #1565C0; color: #FFFFFF; font-size: 12.5px; font-weight: 600;
}
.btn-send:hover { background: #0E4894; }
.btn-send:disabled { background: #B4BCCB; cursor: default; }

.modal {
  position: fixed; inset: 0; background: rgba(26,29,39,0.32); display: flex;
  align-items: center; justify-content: center; z-index: 20;
}
.modal-card {
  width: 360px; max-height: 70vh; background: #FFFFFF; border-radius: 12px;
  display: flex; flex-direction: column; overflow: hidden; box-shadow: 0 8px 24px rgba(0,0,0,0.18);
}
.modal-head {
  flex: none; height: 48px; display: flex; align-items: center; padding: 0 14px;
  border-bottom: 1px solid #DDE1E9; font-size: 13.5px; font-weight: 600;
}
.modal-head .btn-icon { border: none; background: transparent; font-size: 18px; }
.modal-search {
  flex: none; margin: 12px 14px; height: 32px; border: 1px solid #DDE1E9; border-radius: 8px;
  padding: 0 10px; font-size: 12.5px;
}
.modal-search:focus { border-color: #1565C0; }
.modal-results { flex: 1; min-height: 0; overflow-y: auto; padding: 4px 8px 10px; }

.conn-status {
  position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%);
  padding: 8px 16px; border-radius: 999px; background: #1A1D27; color: #FFFFFF;
  font-size: 12px; z-index: 30;
}
.conn-status.error { background: #F03E3E; }

/* ── 반응형(모바일) ──────────────────────────────────────────────────────
   좁은 화면에서는 대화목록/채팅방을 나란히 둘 곳이 없어 한 번에 하나만 보여주고,
   #appBody의 data-view(list|room, messenger.js가 방 열기/뒤로가기에서 토글)로
   어느 쪽을 보여줄지 정한다. 768px 이상(데스크톱/태블릿 가로)에서는 항상 둘 다 보임. */
@media (max-width: 768px) {
  .app-header { height: 48px; padding: 0 12px; gap: 8px; }
  .app-title { font-size: 14px; }
  .my-email { display: none; }
  .btn-ghost { height: 26px; padding: 0 10px; font-size: 12px; }

  .room-list { width: 100%; border-right: none; }
  .app-body[data-view="list"] .room-view { display: none; }
  .app-body[data-view="room"] .room-list { display: none; }
  .back-btn { display: flex; }

  .messages { padding: 12px; }
  .msg-bubble { max-width: 82%; }
  .compose { padding: 8px 10px; }

  .modal { align-items: flex-end; }
  .modal-card { width: 100%; max-height: 80vh; border-radius: 14px 14px 0 0; }
}

/* 데스크톱에서는 모바일 전용 뒤로가기 버튼을 항상 숨기고, 목록/채팅방을 항상 함께 보여준다
   (data-view 토글이 모바일에서만 의미가 있도록 명시적으로 무효화). */
@media (min-width: 769px) {
  .app-body[data-view] .room-view,
  .app-body[data-view] .room-list { display: flex; }
}