* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}
.chat-container {
    width: 350px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
    height: 500px;
}
.chat-header {
    background: #4CAF50;
    color: white;
    padding: 15px;
    text-align: center;
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
}
.chat-messages {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
}
.message {
    margin: 10px 0;
    padding: 10px 15px;
    border-radius: 18px;
    max-width: 80%;
    word-wrap: break-word;
}
.user-message {
    background: #DCF8C6;
    margin-left: auto;
}
.bot-message {
    background: #EAEAEA;
    margin-right: auto;
}
.chat-input {
    display: flex;
    padding: 15px;
    background: #F0F0F0;
    border-top: 1px solid #ddd;
}
.chat-input input {
    flex: 1;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 20px;
    outline: none;
}
.chat-input button {
    margin-left: 10px;
    padding: 12px 20px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
}
.chat-input button:hover {
    background: #45a049;
}