* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #007bff;
}

.connection-status {
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 14px;
}

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

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

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input, select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.calculated-field, .reference-number {
    background-color: #e9ecef;
    padding: 10px;
    border-radius: 4px;
    margin: 15px 0;
    text-align: center;
}

button {
    background-color: #007bff;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    width: 100%;
}

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

button:disabled {
    background-color: #6c757d;
    cursor: not-allowed;
}

.export-section, .transactions-section {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #ddd;
}

.transaction-item {
    background-color: #f8f9fa;
    padding: 10px;
    margin: 5px 0;
    border-radius: 4px;
    border-left: 4px solid #007bff;
}

.transaction-item.offline {
    border-left-color: #ffc107;
}

.offline-badge {
    background-color: #ffc107;
    color: #212529;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 12px;
    margin-left: 10px;
}