* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f2f2f2;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.chat-container {
  width: 400px;
  height: 650px;
  background: white;
  border-radius: 18px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0,0,0,.15);
}

.header {
  background: #111;
  color: white;
  padding: 20px;
}

.header h2 {
  margin: 0 0 5px;
}

.header span {
  color: #66ff99;
  font-size: 13px;
}

.chat {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
}

.message {
  max-width: 80%;
  padding: 12px 14px;
  margin-bottom: 12px;
  border-radius: 14px;
  line-height: 1.4;
}

.bot {
  background: #eee;
  align-self: flex-start;
}

.user {
  background: #111;
  color: white;
  margin-left: auto;
}

.input-area {
  display: flex;
  padding: 15px;
  border-top: 1px solid #ddd;
  gap: 10px;
}

.input-area input {
  flex: 1;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid #ccc;
  outline: none;
}

.input-area button {
  border: none;
  background: #111;
  color: white;
  padding: 0 18px;
  border-radius: 10px;
  cursor: pointer;
}