body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  text-align: center;
  margin: 0;
  padding: 20px;
}

/* 화면 전환 공통 */
.screen { display: none; }
.screen.active { display: block; }
.hidden { display: none !important; }
.row { display:flex; gap:10px; align-items:center; justify-content:center; flex-wrap:wrap; }
.muted { color:#888; font-size:13px; }
.divider { height:1px; background:#eee; margin:16px 0; }
.page-top { margin-top:48px; }

/* 버튼 스타일 */
.mode-btn { padding:12px 18px; }
.back-btn { position:fixed; top:10px; left:10px; }
.selected-mode {
  background-color: #555 !important; /* 진한 회색 */
  color: #fff !important;
}

/* 메인 컨테이너 */
.container {
  max-width: 500px;
  margin: auto;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

/* 층 선택 버튼 */
.floor-buttons button {
  margin: 8px;
  padding: 12px 20px;
  font-size: 16px;
  cursor: pointer;
  border-radius: 6px;
  border: none;
  background: #74d5ff;
  color: #000;
  transition: 0.2s;
}
.floor-buttons button:hover {
  background: #ffffff;
}

/* 분실물 리스트 */
.lost-items {
  padding-left: 0;
  margin: 0 auto;
  max-width: 90%;
}
.lost-items li {
  list-style: none;
  margin: 10px 0;
  padding: 10px;
  background: #fff;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.lost-items li:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.25);
}

/* 분실물 이미지 */
.lost-items img {
  width: 100px;
  height: 100px;
  object-fit: cover;
  margin: 5px 0;
  border-radius: 5px;
}

/* 입력 영역 */
.input-section input[type="text"] {
  width: 70%;
  padding: 8px;
}
.input-section input[type="file"] {
  margin-top: 10px;
}
.input-section button {
  padding: 8px;
  margin-top: 10px;
  cursor: pointer;
  background: #2ecc71;
  border: none;
  border-radius: 5px;
  color: white;
  font-weight: bold;
}
.input-section button:hover {
  background: #27ae60;
}

/* 가이드 버튼 */
.guide-btn {
  position: fixed;
  left: 20px;
  bottom: 20px;
  background: blue;
  color: white;
  padding: 15px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
}

/* 오른쪽 공지창 */
#school-notice {
  position: fixed;
  right: 30px;
  bottom: 500px;   /* 하단 버튼 위로 */
  transform: none;
  background: white;
  padding: 15px 20px;
  width: 250px;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  text-align: left;
  font-size: 14px;
  cursor: pointer;
}

/* 공지 리스트 스타일 */
#school-notice ul {
  padding-left: 18px;
  margin: 0;
  max-height: 150px;
  overflow-y: auto;
}
#school-notice li {
  margin-bottom: 6px;
  line-height: 1.4;
  transition: background 0.2s;
}
#school-notice li:hover {
  background: #f7f7f7;
  border-radius: 4px;
  padding: 2px 4px;
}
#school-notice.dragging { opacity: 0.9; cursor: grabbing; }
#school-notice.expanded ul { max-height: 250px; }

/* 왼쪽 가이드 팝업 */
.guide-popup {
  display: none;
  position: fixed;
  top: 50%;
  left: 30px;
  transform: translateY(-50%);
  background: white;
  padding: 20px;
  border-radius: 10px;
  width: 300px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  text-align: left;
  cursor: default;
  animation: slideIn 0.3s ease;
}
/* 부드럽게 나타나는 애니메이션 */
@keyframes slideIn {
  from { opacity: 0; transform: translateX(-50px) translateY(-50%); }
  to { opacity: 1; transform: translateX(0) translateY(-50%); }
}
.close-button { float: right; cursor: pointer; font-size: 18px; }

/* 이미지 팝업 */
.image-popup {
  display:none; position:fixed; top:0; left:0; width:100%; height:100%;
  background:rgba(0,0,0,0.8); justify-content:center; align-items:center; z-index:999;
}
.image-popup img {
  max-width:90%; max-height:90%; border:3px solid white; box-shadow:0 0 10px black;
}
.image-close {
  position:absolute; top:20px; right:40px; font-size:40px; color:white; cursor:pointer;
}

/* 로그인 입력 레이아웃 */
.login-grid {
  display:grid; gap:8px; justify-content:center;
}