.invoice-pro-container {
    font-family: Arial, sans-serif;
}
header {
    background-color: #1e40af;
}
nav a {
    color: white;
    font-size: 1rem;
}
nav a:hover {
    color: #e5e7eb;
}
main {
    background-color: #f9fafb;
}
.invoice-pro-form, .invoice-pro-list, .invoice-pro-dashboard {
    max-width: 800px;
    margin: 0 auto;
}
.invoice-pro-form input, .invoice-pro-form select {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #d1d5db;
    border-radius: 5px;
}
.invoice-pro-form button {
    background-color: #1e40af;
    color: white;
    padding: 12px 20px;
    border-radius: 5px;
}
.invoice-pro-list table, .invoice-pro-dashboard table {
    width: 100%;
    border-collapse: collapse;
}
.invoice-pro-list th, .invoice-pro-list td {
    padding: 10px;
    border: 1px solid #d1d5db;
}
.success { color: green; }
.error { color: red; }