* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Noto Sans KR", sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #121212;
  color: #fff;
}

.chat-container {
  width: 400px;
  max-width: 95%;
  background: #1e1e1e;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
  padding: 20px;
}

h1 {
  text-align: center;
  margin-bottom: 15px;
}

.chat-box {
  height: 300px;
  overflow-y: auto;
  background: #222;
  padding: 10px;
  border-radius: 8px;
  margin-bottom: 10px;
}

.chat-message {
  margin-bottom: 8px;
  padding: 6px 10px;
  border-radius: 6px;
}

.chat-message.self {
  background: #007bff;
  color: #fff;
  text-align: right;
}

.chat-message.other {
  background: #333;
  color: #fff;
  text-align: left;
}

.input-area {
  display: flex;
  gap: 5px;
}

.input-area input {
  flex: 1;
  padding: 8px;
  border: none;
  border-radius: 6px;
  outline: none;
}

#sendBtn {
  padding: 8px 15px;
  background: #007bff;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

#sendBtn:hover {
  background: #0056b3;
}