body {
    background-color: #f8f9fa;
}

.card {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    border: 1px solid rgba(0, 0, 0, 0.125);
}

.dashboard-card {
    transition: transform 0.2s;
}

.dashboard-card:hover {
    transform: translateY(-5px);
}

.payment-status {
    font-weight: bold;
    padding: 4px 8px;
    border-radius: 4px;
}

.status-pending {
    background-color: #fff3cd;
    color: #856404;
}

.status-approved {
    background-color: #d4edda;
    color: #155724;
}

.status-rejected {
    background-color: #f8d7da;
    color: #721c24;
}

.class-card {
    border-left: 4px solid #007bff;
}

.payment-card {
    border-left: 4px solid #28a745;
}

.upload-area {
    border: 2px dashed #dee2e6;
    border-radius: 5px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.upload-area:hover {
    border-color: #007bff;
    background-color: #f8f9fa;
}

.receipt-preview {
    max-width: 100%;
    max-height: 300px;
    margin-top: 1rem;
}