{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://lumen.dev/schemas/slide-template-registry.json",
  "title": "Lumen Slide Template Registry",
  "description": "Registry mapping slide pattern selectors to metadata, composition variants, required/optional slots, and CSS class contracts. Validates index.json for the lumen-slides skill.",
  "type": "object",
  "required": ["version", "patterns"],
  "properties": {
    "version": {
      "type": "string",
      "description": "Registry version in semver format",
      "pattern": "^\\d+\\.\\d+\\.\\d+$"
    },
    "patterns": {
      "type": "array",
      "description": "Ordered list of slide patterns recognized by SlideEngine",
      "minItems": 10,
      "items": {
        "$ref": "#/definitions/pattern"
      }
    }
  },
  "definitions": {
    "pattern": {
      "type": "object",
      "required": [
        "pattern_key",
        "name",
        "description",
        "composition_variants",
        "required_slots",
        "optional_slots",
        "css_class_contract",
        "supports_reveal"
      ],
      "properties": {
        "pattern_key": {
          "type": "string",
          "description": "Kebab-case selector suffix matched by .slide--{key}",
          "pattern": "^[a-z][a-z0-9-]*$"
        },
        "name": {
          "type": "string",
          "description": "Human-readable pattern name"
        },
        "description": {
          "type": "string",
          "description": "What the pattern is for and its content fit constraints"
        },
        "composition_variants": {
          "type": "array",
          "description": "Supported layout variants for this pattern",
          "items": {
            "type": "string",
            "enum": [
              "centered",
              "left-heavy",
              "right-heavy",
              "split",
              "edge-aligned",
              "full-bleed"
            ]
          },
          "minItems": 1,
          "uniqueItems": true
        },
        "required_slots": {
          "type": "array",
          "description": "CSS class or element selectors that must be present for the pattern to render correctly",
          "items": { "type": "string" },
          "minItems": 1,
          "uniqueItems": true
        },
        "optional_slots": {
          "type": "array",
          "description": "CSS class or element selectors that may be omitted without breaking the pattern",
          "items": { "type": "string" },
          "uniqueItems": true
        },
        "css_class_contract": {
          "type": "array",
          "description": "All CSS class selectors used by this pattern, including both canonical and alias classes from upstream templates",
          "items": { "type": "string" },
          "minItems": 1,
          "uniqueItems": true
        },
        "supports_reveal": {
          "type": "boolean",
          "description": "Whether child elements with .reveal class receive stagger-in animations when the slide becomes visible"
        }
      },
      "additionalProperties": false
    }
  }
}