$f = 'c:\xampp\htdocs\Health_link\index.php'
$t = [IO.File]::ReadAllText($f)

# 1. Watch button: white background, blue text
$old = 'class="watch" style="margin:0;background:rgba(168,85,247,.15);border:1.5px solid rgba(168,85,247,.6);border-radius:30px;padding:8px 18px 8px 8px;white-space:nowrap;">'
$new = 'class="watch" style="margin:0;background:#ffffff;border:1.5px solid #3b82f6;border-radius:30px;padding:8px 18px 8px 8px;white-space:nowrap;">'
$t = $t.Replace($old, $new)

$old2 = '<span style="font-size:13px;font-weight:600;">Watch How It Works</span>'
$new2 = '<span style="font-size:13px;font-weight:600;color:#3b82f6;">Watch How It Works</span>'
$t = $t.Replace($old2, $new2)

# 2. Remove #concept section (75450 to 79346)
$start = 75450
$end = 79346
$t = $t.Substring(0, $start) + $t.Substring($end)

[IO.File]::WriteAllText($f, $t)
Write-Host 'Done'
