.stylelintrc

{
  "rules": {
    "at-rule-empty-line-before": ["always", {
      "except": ["blockless-group", "first-nested"],
      "ignore": ["after-comment"]
    }],
    "at-rule-name-case": "lower",
    "at-rule-no-vendor-prefix": true,
    "at-rule-semicolon-newline-after": "always",

    "block-closing-brace-newline-after": "always",
    "block-closing-brace-newline-before": "always",
    "block-no-empty": true,
    "block-no-single-line": true,
    "block-opening-brace-newline-after": "always",
    "block-opening-brace-space-before": "always",

    "color-hex-case": "upper",
    "color-hex-length": "long",
    "color-named": "never",
    "color-no-hex": true,
    "color-no-invalid-hex": true,

    "comment-whitespace-inside": "always",

    "custom-media-pattern": "seed-.+",
    "custom-property-no-outside-root": true,
    "custom-property-pattern": "seed-.+",

    "declaration-bang-space-after": "never",
    "declaration-bang-space-before": "always",
    "declaration-colon-newline-after": "always-multi-line",
    "declaration-colon-space-after": "always-single-line",
    "declaration-colon-space-before": "never",
    "declaration-no-important": true,

    "declaration-block-no-duplicate-properties": true,
    "declaration-block-no-ignored-properties": true,
    "declaration-block-no-shorthand-property-overrides": true,
    "declaration-block-properties-order": "alphabetical",
    "declaration-block-semicolon-newline-after": "always",
    "declaration-block-semicolon-newline-before": "never-multi-line",
    "declaration-block-semicolon-space-after": "always-single-line",
    "declaration-block-semicolon-space-before": "never",
    "declaration-block-single-line-max-declarations": 1,
    "declaration-block-trailing-semicolon": "always",

    "font-family-name-quotes": "single-where-recommended",

    "function-calc-no-unspaced-operator": true,
    "function-comma-space-after": "always-single-line",
    "function-comma-space-before": "never",
    "function-linear-gradient-no-nonstandard-direction": true,
    "function-max-empty-lines": 0,
    "function-name-case": "lower",
    "function-parentheses-newline-inside": "always-multi-line",
    "function-parentheses-space-inside": "always-single-line",
    "function-whitespace-after": "always",

    "indentation": 2,

    "max-empty-lines": 1,
    "max-line-length": 120,
    "max-nesting-depth": [3, {
      "ignore": ["at-rules-without-declaration-blocks"]
    }],
    "no-duplicate-selectors": true,
    "no-eol-whitespace": true,
    "no-invalid-double-slash-comments": true,
    "no-missing-eof-newline": true,
    "no-unknown-animations": true,
    "stylelint-disable-reason": "always-after",

    "media-feature-colon-space-after": "always",
    "media-feature-colon-space-before": "never",
    "media-feature-name-no-vendor-prefix": true,
    "media-feature-no-missing-punctuation": true,
    "media-feature-range-operator-space-after": "always",
    "media-feature-range-operator-space-before": "always",
    "media-query-list-comma-newline-after": "always-multi-line",
    "media-query-list-comma-newline-before": "never-multi-line",
    "media-query-list-comma-space-after": "always",
    "media-query-list-comma-space-before": "never",
    "media-query-parentheses-space-inside": "always",

    "number-leading-zero": "never",
    "number-max-precision": 3,
    "number-no-trailing-zeros": true,
    "number-zero-length-no-unit": true,

    "property-case": "lower",
    "property-no-vendor-prefix": true,
    "property-blacklist": [[
      "font-family",
      "font-weight",
      "font-size"
    ], {
      "severity": "warning"
    }],

    "root-no-standard-properties": true,

    "rule-nested-empty-line-before": ["always", {
      "except": ["first-nested"],
      "ignore": ["after-comment"]
    }],
    "rule-non-nested-empty-line-before": ["always", {
      "ignore": ["after-comment"]
    }],

    "selector-attribute-brackets-space-inside": "always",
    "selector-combinator-space-after": "always",
    "selector-combinator-space-before": "always",
    "selector-no-universal": true,
    "selector-no-vendor-prefix": true,
    "selector-pseudo-class-case": "lower",
    "selector-pseudo-class-parentheses-space-inside": "always",
    "selector-pseudo-element-case": "lower",
    "selector-pseudo-element-colon-notation": "single",
    "selector-root-no-composition": true,
    "selector-type-case": "lower",

    "selector-list-comma-newline-after": "always",
    "selector-list-comma-newline-before": "never-multi-line",
    "selector-list-comma-space-after": "always-single-line",
    "selector-list-comma-space-before": "never",

    "shorthand-property-no-redundant-values": true,

    "string-no-newline": true,
    "string-quotes": "single",

    "time-no-imperceptible": true,

    "unit-case": "lower",
    "unit-no-unknown": true,

    "value-keyword-case": "lower",
    "value-list-comma-newline-after": "always-multi-line",
    "value-list-comma-newline-before": "never-multi-line",
    "value-list-comma-space-after": "always-single-line",
    "value-list-comma-space-before": "never",

    "value-no-vendor-prefix": true
  }
}