diff --git a/definitions/default/client-site.tf b/definitions/default/client-site.tf
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+++ b/definitions/default/client-site.tf
@@ -0,0 +1,223 @@
+/**
+ * Client Joomla Site Structure Definition
+ * Standard repository structure for client Joomla site projects
+ *
+ * Copyright (C) 2026 Moko Consulting <hello@mokoconsulting.tech>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ * Version: 01.00.00
+ * Schema Version: 1.0
+ */
+
+locals {
+  repository_structure = {
+    metadata = {
+      name             = "Client Joomla Site"
+      description      = "Standard repository structure for client Joomla site projects (overrides, media, configuration)"
+      repository_type  = "client-site"
+      platform         = "mokowaas"
+      last_updated     = "2026-05-04T00:00:00Z"
+      maintainer       = "Moko Consulting"
+      version          = "01.00.00"
+      schema_version   = "1.0"
+      template_repo    = "MokoConsulting/MokoStandards-Template-Client"
+    }
+
+    root_files = [
+      {
+        name              = "README.md"
+        description       = "Client project documentation"
+        required          = true
+        always_overwrite  = false
+      },
+      {
+        name              = "LICENSE"
+        description       = "License file (GPL-3.0-or-later)"
+        required          = true
+      },
+      {
+        name              = "CHANGELOG.md"
+        description       = "Version history and changes"
+        required          = true
+      },
+      {
+        name              = "SECURITY.md"
+        description       = "Security policy and vulnerability reporting"
+        required          = true
+        always_overwrite  = true
+      },
+      {
+        name              = "CODE_OF_CONDUCT.md"
+        description       = "Community code of conduct"
+        required          = true
+        always_overwrite  = true
+      },
+      {
+        name              = "CONTRIBUTING.md"
+        description       = "Contribution guidelines"
+        required          = true
+        always_overwrite  = true
+      },
+      {
+        name              = "Makefile"
+        description       = "Build automation"
+        required          = true
+        always_overwrite  = true
+      },
+      {
+        name              = "composer.json"
+        description       = "PHP dependency management"
+        required          = true
+        always_overwrite  = false
+      },
+      {
+        name              = "phpstan.neon"
+        description       = "PHPStan static analysis config"
+        required          = true
+        always_overwrite  = true
+      },
+      {
+        name              = "codeception.yml"
+        description       = "Codeception test framework config"
+        required          = false
+        always_overwrite  = false
+      },
+      {
+        name              = ".editorconfig"
+        description       = "Editor configuration for consistent coding style"
+        required          = true
+        always_overwrite  = true
+      },
+      {
+        name              = ".gitignore"
+        description       = "Git ignore patterns for client site projects"
+        required          = true
+        always_overwrite  = false
+      },
+    ]
+
+    // NOTE: Client sites do NOT have updates.xml — they are not installable extensions
+
+    subdirectories = [
+      {
+        name        = "src"
+        description = "Site source files — template overrides, custom code, and configuration"
+        required    = true
+        files       = []
+      },
+      {
+        name        = "src/images"
+        description = "Site images — branding, headers, event photos, profiles"
+        required    = true
+        files       = []
+      },
+      {
+        name        = "src/media"
+        description = "Media assets — uploaded files, documents"
+        required    = true
+        files       = []
+      },
+      {
+        name        = "docs"
+        description = "Client-specific documentation — brand reference, deployment, migration plans"
+        required    = true
+        files       = []
+      },
+      {
+        name        = "scripts"
+        description = "Deployment and maintenance scripts"
+        required    = false
+        files       = []
+      },
+      {
+        name        = "tests"
+        description = "Acceptance and unit tests"
+        required    = false
+        files       = []
+      },
+      {
+        name        = ".gitea/workflows"
+        description = "Gitea Actions CI/CD workflows (10 workflows — no update-server)"
+        required    = true
+        files = [
+          {
+            name              = "auto-release.yml"
+            description       = "Stable release on PR merge to main"
+            required          = true
+            always_overwrite  = true
+          },
+          {
+            name              = "pre-release.yml"
+            description       = "Manual pre-release for dev/alpha/beta/rc channels"
+            required          = true
+            always_overwrite  = true
+          },
+          {
+            name              = "ci-joomla.yml"
+            description       = "PHP lint, PHPStan, coding standards"
+            required          = true
+            always_overwrite  = true
+          },
+          {
+            name              = "pr-check.yml"
+            description       = "PR gate — validates code quality before merge"
+            required          = true
+            always_overwrite  = true
+          },
+          {
+            name              = "deploy-manual.yml"
+            description       = "Manual SFTP deploy to selected environment"
+            required          = true
+            always_overwrite  = true
+          },
+          {
+            name              = "repo-health.yml"
+            description       = "Repository health checks"
+            required          = true
+            always_overwrite  = true
+          },
+          {
+            name              = "security-audit.yml"
+            description       = "Dependency vulnerability scanning"
+            required          = true
+            always_overwrite  = true
+          },
+          {
+            name              = "notify.yml"
+            description       = "ntfy push notifications on release success or failure"
+            required          = true
+            always_overwrite  = true
+          },
+          {
+            name              = "cleanup.yml"
+            description       = "Weekly merged branch + old run cleanup"
+            required          = true
+            always_overwrite  = true
+          },
+          {
+            name              = "sync-media.yml"
+            description       = "Bidirectional SFTP sync for images/, files/, media/ between dev and production"
+            required          = true
+            always_overwrite  = true
+          },
+        ]
+      },
+    ]
+
+    // Per-repo variables required for sync-media.yml
+    required_variables = [
+      { name = "DEV_SYNC_HOST",      description = "Dev server hostname" },
+      { name = "DEV_SYNC_PORT",      description = "Dev SSH port (default 22)" },
+      { name = "DEV_SYNC_USERNAME",  description = "Dev server username" },
+      { name = "DEV_SYNC_PATH",      description = "Base path on dev server" },
+      { name = "PROD_SYNC_HOST",     description = "Production server hostname" },
+      { name = "PROD_SYNC_PORT",     description = "Production SSH port (default 22)" },
+      { name = "PROD_SYNC_USERNAME", description = "Production server username" },
+      { name = "PROD_SYNC_PATH",     description = "Base path on production server" },
+    ]
+
+    required_secrets = [
+      { name = "DEV_SYNC_KEY",  description = "SSH private key for dev server" },
+      { name = "PROD_SYNC_KEY", description = "SSH private key for production server" },
+    ]
+  }
+}