* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #eef2f7;
  padding: 30px;
  max-width: 480px;
  margin: 40px auto;
  color: #333;
}


.head1 {
  text-align: center;
  font-weight: 700;
  font-size: 2rem;
  color: #1e90ff;
  margin-bottom: 25px;
  user-select: none;
}


#chat {
  width: 100%;
  height: 500px;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  padding: 20px;
  overflow-y: auto;
  font-size: 16px;
  line-height: 1.5;
  margin-bottom: 15px;
  white-space: pre-wrap; 
}


input#input {
  width: 100%;
  padding: 12px 15px;
  font-size: 16px;
  border-radius: 25px;
  border: 1.5px solid #ccc;
  outline: none;
  box-sizing: border-box;
  margin-bottom: 12px;
  transition: border-color 0.3s ease;
}

input#input:focus {
  border-color: #1e90ff;
  box-shadow: 0 0 8px rgba(30,144,255,0.4);
}


button {
  width: 100%;
  padding: 12px 0;
  font-size: 16px;
  background-color: #1e90ff;
  color: white;
  border: none;
  border-radius: 25px;
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #0f6cd4;
}


@media (max-width: 480px) {
  body {
    margin: 20px 10px;
    padding: 20px 10px;
  }
  
  #chat {
    height: 60vh;
    padding: 15px;
  }
}