.checkin-container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: #1a202c;
    border-radius: 0.5rem;
    color: white;
    text-align: center;
}

.checkin-card {
    padding: 2rem;
    background-color: #2d3748;
    border-radius: 0.5rem;
}

#streak-counter {
    font-weight: bold;
    font-size: 1.5rem;
}

#checkin-button {
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    border: 1px solid #4a5568;
    background-color: #4a5568;
    color: white;
    border-radius: 0.5rem;
    cursor: pointer;
}

#checkin-button:disabled {
    background-color: #2d3748;
    cursor: not-allowed;
}

#checkin-message {
    margin-top: 1rem;
    color: #a0aec0;
}