{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json",
  "title": "Appearance",
  "description": "Color spaces, paint, typography, filters, surface and rendering appearance.",
  "$defs": {
    "color": {
      "anyOf": [
        {
          "type": "string",
          "pattern": "^#(?:[0-9a-fA-F]{3}|[0-9a-fA-F]{4}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8})$"
        },
        {
          "enum": [
            "transparent",
            "currentColor",
            "black",
            "white"
          ]
        },
        {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/tokenRef"
        },
        {
          "type": "object",
          "properties": {
            "space": {
              "enum": [
                "srgb",
                "srgb-linear",
                "display-p3",
                "rec2020",
                "lab",
                "lch",
                "oklab",
                "oklch",
                "xyz-d50",
                "xyz-d65"
              ]
            },
            "channels": {
              "type": "array",
              "items": {
                "type": "number"
              },
              "minItems": 3,
              "maxItems": 3
            },
            "alpha": {
              "type": "number",
              "minimum": 0,
              "maximum": 1
            }
          },
          "required": [
            "space",
            "channels"
          ],
          "additionalProperties": false
        }
      ]
    },
    "gradient": {
      "type": "object",
      "properties": {
        "type": {
          "enum": [
            "linear",
            "radial",
            "conic"
          ]
        },
        "angle": {
          "type": "number"
        },
        "center": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/vector2"
        },
        "stops": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "offset": {
                "type": "number",
                "minimum": 0,
                "maximum": 1
              },
              "color": {
                "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/color"
              }
            },
            "required": [
              "offset",
              "color"
            ],
            "additionalProperties": false
          },
          "minItems": 2
        }
      },
      "required": [
        "type",
        "stops"
      ],
      "additionalProperties": false
    },
    "paint": {
      "anyOf": [
        {
          "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/color"
        },
        {
          "type": "object",
          "properties": {
            "type": {
              "enum": [
                "solid",
                "gradient",
                "image",
                "pattern"
              ]
            },
            "color": {
              "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/color"
            },
            "gradient": {
              "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/gradient"
            },
            "assetRef": {
              "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
            },
            "scale": {
              "type": "number",
              "minimum": 0
            },
            "repeat": {
              "enum": [
                "none",
                "x",
                "y",
                "both"
              ]
            },
            "opacity": {
              "type": "number",
              "minimum": 0,
              "maximum": 1
            }
          },
          "required": [
            "type"
          ],
          "additionalProperties": false
        }
      ]
    },
    "stroke": {
      "type": "object",
      "properties": {
        "color": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/color"
        },
        "width": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/size"
        },
        "alignment": {
          "enum": [
            "inside",
            "center",
            "outside"
          ]
        },
        "dash": {
          "type": "array",
          "items": {
            "type": "number",
            "minimum": 0
          }
        },
        "cap": {
          "enum": [
            "butt",
            "round",
            "square"
          ]
        },
        "join": {
          "enum": [
            "miter",
            "round",
            "bevel"
          ]
        }
      },
      "required": [
        "color",
        "width"
      ],
      "additionalProperties": false
    },
    "shadow": {
      "type": "object",
      "properties": {
        "color": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/color"
        },
        "x": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/dimension"
        },
        "y": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/dimension"
        },
        "blur": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/size"
        },
        "spread": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/dimension"
        },
        "inset": {
          "type": "boolean"
        }
      },
      "required": [
        "color",
        "x",
        "y",
        "blur"
      ],
      "additionalProperties": false
    },
    "typography": {
      "type": "object",
      "properties": {
        "fontFamily": {
          "anyOf": [
            {
              "type": "string",
              "minLength": 1
            },
            {
              "type": "array",
              "items": {
                "type": "string",
                "minLength": 1
              },
              "minItems": 1
            }
          ]
        },
        "fontAssetRef": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "fontSize": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/size"
        },
        "fontWeight": {
          "anyOf": [
            {
              "type": "integer",
              "minimum": 1,
              "maximum": 1000
            },
            {
              "enum": [
                "normal",
                "bold"
              ]
            }
          ]
        },
        "fontStyle": {
          "enum": [
            "normal",
            "italic",
            "oblique"
          ]
        },
        "lineHeight": {
          "anyOf": [
            {
              "type": "number",
              "minimum": 0
            },
            {
              "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/dimension"
            }
          ]
        },
        "letterSpacing": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/dimension"
        },
        "textAlign": {
          "enum": [
            "start",
            "end",
            "left",
            "right",
            "center",
            "justify"
          ]
        },
        "textTransform": {
          "enum": [
            "none",
            "uppercase",
            "lowercase",
            "capitalize"
          ]
        },
        "textDecoration": {
          "enum": [
            "none",
            "underline",
            "line-through",
            "overline"
          ]
        },
        "direction": {
          "enum": [
            "ltr",
            "rtl",
            "auto"
          ]
        },
        "fontFeatures": {
          "type": "object",
          "additionalProperties": {
            "type": "boolean"
          }
        },
        "fontVariations": {
          "type": "object",
          "additionalProperties": {
            "type": "number"
          }
        },
        "maxLines": {
          "type": "integer",
          "minimum": 1
        },
        "overflow": {
          "enum": [
            "clip",
            "ellipsis",
            "wrap"
          ]
        }
      },
      "additionalProperties": false
    },
    "filter": {
      "type": "object",
      "properties": {
        "type": {
          "enum": [
            "blur",
            "brightness",
            "contrast",
            "grayscale",
            "hue-rotate",
            "invert",
            "saturate",
            "sepia",
            "custom"
          ]
        },
        "amount": {
          "type": "number"
        },
        "assetRef": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        }
      },
      "required": [
        "type"
      ],
      "additionalProperties": false
    },
    "appearance": {
      "type": "object",
      "properties": {
        "fill": {
          "anyOf": [
            {
              "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/paint"
            },
            {
              "type": "array",
              "items": {
                "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/paint"
              }
            }
          ]
        },
        "background": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/paint"
        },
        "color": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/color"
        },
        "stroke": {
          "anyOf": [
            {
              "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/stroke"
            },
            {
              "type": "array",
              "items": {
                "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/stroke"
              }
            }
          ]
        },
        "opacity": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "blend": {
          "enum": [
            "normal",
            "multiply",
            "screen",
            "overlay",
            "darken",
            "lighten",
            "color-dodge",
            "color-burn",
            "hard-light",
            "soft-light",
            "difference",
            "exclusion",
            "hue",
            "saturation",
            "color",
            "luminosity"
          ]
        },
        "radius": {
          "anyOf": [
            {
              "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/size"
            },
            {
              "type": "object",
              "properties": {
                "topLeft": {
                  "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/size"
                },
                "topRight": {
                  "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/size"
                },
                "bottomRight": {
                  "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/size"
                },
                "bottomLeft": {
                  "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/size"
                }
              },
              "additionalProperties": false
            }
          ]
        },
        "shadows": {
          "type": "array",
          "items": {
            "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/shadow"
          }
        },
        "blur": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/size"
        },
        "filters": {
          "type": "array",
          "items": {
            "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/filter"
          }
        },
        "maskRef": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "clipRef": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "materialRef": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "textureRef": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "typography": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/typography"
        },
        "visible": {
          "type": "boolean"
        },
        "extensions": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/extensions"
        }
      },
      "additionalProperties": false
    }
  },
  "$ref": "#/$defs/appearance"
}