body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f2f5;
    color: #333;
}

main {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 400px;
    width: 90%;
}

h1 {
    font-size: 1.5rem;
    margin-top: 0;
}

#message-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
}

#message-input {
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
}

#send-button {
    padding: 0.75rem;
    border: none;
    border-radius: 4px;
    background-color: #007bff;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#send-button:hover {
    background-color: #0056b3;
}

#send-button:disabled {
    background-color: #a0c7e4;
    cursor: not-allowed;
}

#status-message {
    margin-top: 1rem;
    font-size: 0.9rem;
    height: 20px;
}

.success {
    color: #28a745;
}

.error {
    color: #dc3545;
}