$ErrorActionPreference = 'Stop'
$root = Split-Path $PSScriptRoot -Parent
$page = [System.IO.File]::ReadAllText((Join-Path $root 'pages/family/f01-family-feed.vue'), [System.Text.Encoding]::UTF8)

foreach ($expected in @(
  'box-sizing: border-box',
  'width: 514rpx',
  'background: url("/static/assets/foundation/transparent/a01-scroll-secondary-v3.png") center / 100% 100% no-repeat',
  'background: url("/static/assets/modules/family/transparent/f01-family-letter-card.png") center / 100% 100% no-repeat',
  'background: url("/static/assets/foundation/transparent/a01-scroll-primary-v3.png") center / 100% 100% no-repeat'
)) {
  if (-not $page.Contains($expected)) { throw "F01 document-flow contract missing: $expected" }
}
if ($page -match '<image\s+(?:[^>]*\s)?class="(?:feed-shortcuts__skin|feed-card__skin)"|feed-state-card\s*>\s*<image|feed-action[^>]*>\s*<image') { throw 'F01 decorative skins must be container backgrounds' }
if ($page -match 'position\s*:') { throw 'F01 must keep ordinary content in document flow' }

Write-Output 'F01-DOCUMENT-FLOW-CONTRACT PASS'