{
  "contract_version": "gab_010_contract_v1",
  "gab_id": "GAB-010",
  "canonical_name": "SessionAccessGate",
  "module_owner": "EdTechPlayEngine",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "gate_instance_id",
    "gate_type",
    "variants",
    "secondary_cta"
  ],
  "optional_fields": [
    "icon",
    "hint",
    "accessibility",
    "child_safety"
  ],
  "field_types": {
    "gate_type": "enum['login','prereq','premium']",
    "variants": "object{login:{title,sub,body,primary_cta}, prereq:{title,sub,body,primary_cta}, premium:{title,sub,body,primary_cta}}",
    "secondary_cta": "string",
    "icon": "string (emoji)",
    "hint": "string"
  },
  "constraints": [
    "gate_type doit correspondre à une clé présente dans variants.",
    "Chaque variante doit fournir title, sub, body et primary_cta.",
    "secondary_cta est un texte global commun à toutes les variantes.",
    "Le switch de variante est piloté par gate_type (variante active au chargement) et par l'interaction utilisateur."
  ],
  "blocked_conditions": [
    "gate_type absent",
    "variants absent",
    "secondary_cta absent",
    "gate_instance_id absent"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "role_button_on_ctas"
  ],
  "qa_cases": [
    { "case": "instance conforme (gate_type=login)", "expected": "rendu complet variante login, 0 erreur" },
    { "case": "champ requis manquant (variants absent)", "expected": "BLOCKED listant le champ" },
    { "case": "switch vers variante prereq", "expected": "title/sub/body/primary_cta changent sans modifier le HTML" },
    { "case": "switch vers variante premium", "expected": "tone incitatif affiché, bouton 'Découvrir l'offre'" },
    { "case": "instance externe injectée", "expected": "le rendu change sans modifier le HTML" },
    { "case": "responsive 375/768/1024", "expected": "aucun débordement horizontal" }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-010",
    "note": "Ce schema VALIDE l'instance. Le contrat pédagogique complet (input_contract/validation_logic/feedback_scoring_logic) vit dans le CORE-GAB officiel, pas ici (évite la duplication)."
  }
}