.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    font-family: Arial, sans-serif;
}

h1 {
    text-align: center;
    color: #333;
}

.connection-panel, .call-panel, .chat-panel {
    margin-bottom: 20px;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.connection-panel {
    background-color: #f0f8ff;
}

.call-panel {
    background-color: #f8f0ff;
}

.chat-panel {
    background-color: #f0fff8;
    height: 400px;
    display: flex;
    flex-direction: column;
}

#messages {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 10px;
}

.message {
    margin-bottom: 10px;
    padding: 8px 12px;
    border-radius: 4px;
    max-width: 70%;
}

.message.outgoing {
    background-color: #dcf8c6;
    margin-left: auto;
}

.message.incoming {
    background-color: #e0e0e0;
}

.input-area {
    display: flex;
    gap: 10px;
}

input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    padding: 10px 15px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}

button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

@media (max-width: 600px) {
    .container {
        padding: 10px;
    }

    .message {
        max-width: 85%;
    }
}