body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #0d0d0d;
    color: #fff;
}

#chat-container {
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
    background: #1a1a1a;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

#header {
    text-align: center;
    padding: 20px;
    background: #111;
    border-bottom: 1px solid #333;
}

#avatar {
    width: 80px;
    margin-bottom: 10px;
}

#messages {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
}

.msg {
    padding: 10px 14px;
    margin-bottom: 12px;
    border-radius: 10px;
    max-width: 80%;
}

.msg.user {
    background: #007bff;
    margin-left: auto;
}

.msg.bot {
    background: #333;
    margin-right: auto;
}

#input-area {
    display: flex;
    padding: 10px;
    background: #111;
}

#user-input {
    flex: 1;
    padding: 10px;
    border: none;
    background: #222;
    color: white;
    border-radius: 8px;
}

#send-btn {
    padding: 0 20px;
    border: none;
    background: #f1c40f;
    color: black;
    margin-left: 10px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
}