body {
  margin: 0;
  font-family: 'Montserrat', sans-serif;
  background: #f5f7fa;
  color: #333;
}

.container {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

.chat-list {
  width: 280px;
  background: #fff;
  border-right: 1px solid #ddd;
  display: flex;
  flex-direction: column;
}

.chat-header {
  padding: 16px;
  font-weight: bold;
  border-bottom: 1px solid #ddd;
  background: #f9f9f9;
}

#chatList {
  flex-grow: 1;
  overflow-y: auto;
  list-style: none;
  padding: 0;
  margin: 0;
}

#chatList li {
  padding: 12px 16px;
  border-bottom: 1px solid #eee;
  cursor: pointer;
  font-size: 14px;
}

#chatList li:hover,
#chatList li.active {
  background: #e0f0ff;
}

#newChat {
  border: none;
  background: #007aff;
  color: #fff;
  padding: 12px;
  font-size: 14px;
  cursor: pointer;
  width: 100%;
}

.chat-area {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 16px;
  background: #f5f7fa;
}

.chat-box {
  flex-grow: 1;
  overflow-y: auto;
  padding: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message {
  max-width: 75%;
  padding: 12px 16px;
  border-radius: 20px;
  line-height: 1.5;
  font-size: 15px;
  white-space: pre-wrap;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  animation: fadeIn 0.3s ease-in-out;
}

.message.user {
  background: #daf3ff;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.message.bot {
  background: #fff;
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

form {
  display: flex;
  border-top: 1px solid #ddd;
  padding: 12px 0;
  gap: 12px;
  background: #f5f7fa;
}

input[type='text'] {
  flex-grow: 1;
  padding: 12px;
  font-size: 15px;
  border: 1px solid #ccc;
  border-radius: 20px;
  outline: none;
  background: #fff;
}

button[type='submit'] {
  background: #007aff;
  color: #fff;
  border: none;
  padding: 12px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}