{
  "contract_version": "gab_220_contract_v1",
  "gab_id": "GAB-220",
  "canonical_name": "AdaptiveLearningNextStepBridge",
  "module_owner": "EdTechAdaptiveLearning",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "bridge_id",
    "title",
    "next_step_type",
    "next_action",
    "primary_cta"
  ],
  "optional_fields": [
    "subtitle",
    "decision_tag",
    "result_heading",
    "result_text",
    "reason_heading",
    "reason_text",
    "secondary_cta"
  ],
  "field_types": {
    "next_step_type": "enum['advance','review','test','memory','visual','exercise','pathmap','ketty']",
    "next_action": "string — texte de l'action principale affichée dans la direction card",
    "primary_cta": "string — libellé du bouton principal",
    "secondary_cta": "string — libellé du bouton alternatif (optionnel, affiche 'Alternative' si absent)",
    "result_text": "string — résumé textuel du résultat adaptatif (optionnel, masqué si absent)",
    "reason_text": "string — explication de la suite proposée (optionnel, masqué si absent)",
    "decision_tag": "string — badge décision affiché en haut (ex: 'DECISION · ADVANCE')"
  },
  "constraints": [
    "next_step_type doit être une des 8 valeurs de l'enum ; valeur inconnue = fallback icône ➡️.",
    "primary_cta : bouton structurel principal, libellé venant du JSON.",
    "secondary_cta optionnel : si absent, affiche 'Alternative' sans bloquer le rendu.",
    "result_box et reason_block sont masqués si result_text / reason_text sont absents (pas de bloc vide)."
  ],
  "blocked_conditions": [
    "title absent",
    "next_step_type absent",
    "next_action absent",
    "primary_cta absent"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "boutons focusables avec outline violet"
  ],
  "qa_cases": [
    { "case": "instance conforme", "expected": "rendu complet, 0 erreur" },
    { "case": "champ requis manquant (ex: primary_cta)", "expected": "BLOCKED listant le champ manquant" },
    { "case": "next_step_type='exercise'", "expected": "icône 📝, badge EXERCISE bleu ciel" },
    { "case": "next_step_type='ketty'", "expected": "icône 🦊, badge KETTY corail" },
    { "case": "instance externe injectée via init(ext)", "expected": "le rendu change sans modifier le HTML" },
    { "case": "result_text absent", "expected": "result-box masqué proprement" },
    { "case": "reason_text absent", "expected": "reason-block masqué proprement" },
    { "case": "clic primary_cta", "expected": "feedback-panel vert avec texte primary_cta" },
    { "case": "clic secondary_cta", "expected": "feedback-panel neutre avec texte secondary_cta" },
    { "case": "responsive 375/768/1024", "expected": "aucun débordement horizontal" }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-220",
    "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)."
  }
}