Handle shorthand values (with underscore)

[phucbm]

Class style-[--radius=300px_20px_20px_300px]

Output ❌

.style-\[--radius\=300px_20px_20px_300px\] {
  --radius:300px_20px_20px_300px;
}

Expected ✅

.style-\[--radius\=300px_20px_20px_300px\] {
  --radius:300px 20px 20px 300px;
}