body { 
    background:#f5f7fb;
    font-family:"Microsoft JhengHei",sans-serif;
}

input {
  width: 500px;
  padding: 12px 16px;
  margin: 0px 10px;
  border: 2px solid #ddd;
  border-radius: 8px;
  outline: none;
  font-size: 14px;
}
 
button {
  background: #2575fc;
  color: white;
  padding: 10px;
  border: none;
  border-radius: 20px;
  font-size: 20px;
  cursor: pointer;
}

#btn_area{
  width: 500px;
  display: flex;
  justify-content: space-evenly;

  padding: 0px 16px 12px 16px;
  margin: 0px 10px;
  border: 2px solid transparent;

}

.note {
  position: relative;
  width: 500px;
  padding: 10px 16px;
  margin: 10px;
  border: 2px solid #ddd;
  border-radius: 16px;
  background: #fff;
  cursor: pointer;

  white-space: pre-line;
  word-break: break-word;     /* 防止數字爆出欄位 */
  overflow-wrap: break-word;  
}

/* 詳細聊天紀錄 */
.panel {
  position: fixed; /* 固定在右半邊 */
  top: 0;
  right: -800px; /* 預設藏起來 */
  width: 600px; /* 600px */
  height: 100%;
  background: #fff;
  box-shadow: -5px 0 20px rgba(0,0,0,0.1); /* 陰影 */
  padding: 10px;
  transition: right 0.5s ease;
  z-index: 1000;
}

.panel.open { /* 有 open 類別的 panel */
  right:  0; /* 滑出來 */
}

.panel-content {
  height: 300px;
}

/* 聊天室 */
.chat-list {
  height: 200px;
  overflow-y: auto;
  border: 1px solid #ddd;
  padding: 10px;
  margin-bottom: 10px;
  background: #fafafa;
  border-radius: 10px;
}

.chat-message {
  padding: 4px 12px; /* 4px 防止第4行頂部被看到 */
  margin: 6px 0;
  background: rgba(128, 128, 128, 0.5);
  color: black;
  border-radius: 10px;

  max-width: 80%;           /* ⭐ 最長不超過 80% */
  width: fit-content;       /* ⭐ 關鍵：貼內容寬度 */

  word-break: break-word;

  white-space: pre-wrap;   /* 維持原本文字 不縮排 */

  /* ⭐ 新增 ↓ */
  display: -webkit-box;
  -webkit-line-clamp: 3;      /* 限制3行 */
  -webkit-box-orient: vertical;
  overflow: hidden;

   

}

.chat-message.expanded {
  -webkit-line-clamp: unset; /* 展開全部 */
}


.chat-input-area {
  display: flex;
  gap: 10px;
}

.chat-input-area input {
  flex: 1;
}


/* 刪除按鈕 */
.delete-btn {
  position: absolute;
  top: 10px;
  right: 10px;

  width: 30px;
  height: 30px;

  background: #ff4d4f; /* 紅色 */
  color: white;

  border: none;
  border-radius: 25%;

  font-size: 16px;
  font-weight: bold;

  display: flex;
  align-items: center;
  justify-content: center;

  cursor: pointer;

  transition: all 0.2s ease;
}

/* hover 效果 */
.delete-btn:hover {
  background: #d9363e;
  transform: scale(1.1);
}

/* 點擊效果 */
.delete-btn:active {
  transform: scale(0.95);
}


/* 遮罩 */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5); /* 半透明背景 */
  display: none;
}

.overlay.open {
  display: block;
}

/* 聊天輸入框 */
#chat_input {
  flex: 1;
  padding: 8px 12px;
  border: 2px solid #ddd;
  border-radius: 8px;
  font-size: 14px;

  resize: none;

  min-height: 60px;
  max-height: 60px;   /* 限制最大高度 */
  overflow-y: auto;    /* 超出出現滾輪 */
}

/* 操作小方框 */
.chat-menu {
  position: absolute;
  background: white;
  border-radius: 10px;
  box-shadow: 0 5px 20px rgba(0,0,0,0.2);
  padding: 5px 0;

  display: none;
  z-index: 2000;
}

.chat-menu div {
  padding: 8px 16px;
  cursor: pointer;
}

.chat-menu div:hover {
  background: #f0f0f0;
}

.chat-input-area button{
  height: 75px;
  width: 75px;
} 

/* 大型輸入框 */
.big-input-box {
  position: fixed;
  top: 0;
  right: 600px; /* 剛好貼在 panel 左邊 */
  width: 600px; /* 600px */
  height: 100%;
  background: #fff;

  box-shadow: -5px 0 20px rgba(0,0,0,0.1);
  padding: 10px;

  transform: translateX(100%); /* 預設藏起來 */
  transition: transform 0.4s ease;

  z-index: 999;
}

.big-input-box.open {
  transform: translateX(0); /* 滑出來 */
}

#big_textarea {
  width: 90%;
  height: 70%;
  resize: none;
  border: 2px solid #ddd;
  border-radius: 10px;
  padding: 10px;
}