.container {
    max-width: 1500px;
}
.form-header {
    background: linear-gradient(90deg, #007bff, #0056b3);
    color: white;
    padding: 0.5rem;
    border-radius: 10px 10px 0 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.form-header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    margin: 0;
}
.table-card, .form-card {
    background: white;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    margin-bottom: 2rem;
}
.section-header {
    font-size: 1.4rem;
    font-weight: 600;
    color: #1a3c6d;
    margin: 1.5rem 0 1rem;
    border-left: 4px solid #007bff;
    padding-left: 0.75rem;
}
.btn-create, .btn-add-installment, .btn-add-article {
    font-weight: 500;
    padding: 0.5rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-radius: 6px;
}
.btn-create:hover, .btn-add-installment:hover, .btn-add-article:hover {
    background-color: #0056b3;
}
.btn-remove-installment, .btn-remove-article {
    background-color: #dc3545;
    color: white;
    border: none;
    padding: 0.5rem;
    border-radius: 6px;
    margin-left: 0.5rem;
}
.btn-remove-installment:hover, .btn-remove-article:hover {
    background-color: #c82333;
}
.installment-container, .article-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}
.installment-container input, .article-container input, .article-container select {
    flex: 1;
}
.table th {
    font-weight: 600;
    color: #1a3c6d;
}
.table td {
    vertical-align: middle;
}
.dropdown-menu {
    min-width: 120px;
}
.dropdown-item i {
    margin-right: 8px;
}
.pagination .page-link {
    color: #1b2d73;
}
.pagination .page-item.active .page-link {
    background-color: #007bff;
    border-color: #007bff;
}
.form-control, .form-select {
    border-radius: 6px;
}
.form-label {
    font-weight: 500;
    color: #1a3c6d;
}
.alert {
    border-radius: 6px;
}