docs(readme): add usage in CSS files

.editorconfig

@@ -1,3 +1,5 @@
+# EditorConfig <http://editorconfig.org>
+
 root = true
 
 [*]

Gruntfile.coffee

@@ -1,7 +1,6 @@
 module.exports = (grunt) ->
   # Load Grunt Tasks
   require('load-grunt-tasks') grunt
-
   # Project Configuration
   grunt.initConfig
     # NPM Package Declare

README.md

@@ -2,9 +2,9 @@
 
 <center>
 
-[![Version](https://img.shields.io/npm/v/x-markdown-css.svg)](https://www.npmjs.com/package/x-markdown-css)
-[![Node.js Requirement](https://img.shields.io/badge/node-%3E%3D16-blue.svg)](https://github.com/kuohuanhuan/x-markdown-css/blob/master/package.json)
-[![MIT License](https://img.shields.io/github/license/kuohuanhuan/x-markdown-css)](https://github.com/kuohuanhuan/x-markdown-css/blob/master/LICENSE)
+[![NPM Version](https://img.shields.io/npm/v/x-markdown-css)](https://www.npmjs.com/package/x-markdown-css)
+[![GitHub Actions](https://img.shields.io/github/actions/workflow/status/kuohuanhuan/x-markdown-css/ci.yml)](https://github.com/kuohuanhuan/x-markdown-css/actions/workflows/ci.yml)
+[![MIT License](https://img.shields.io/github/license/kuohuanhuan/x-markdown-css?color=blue)](https://github.com/kuohuanhuan/x-markdown-css/blob/master/LICENSE)
 
 </center>
 
@@ -24,9 +24,9 @@ You can use `x-markdown-css` with:
 - jsDelivr: `https://fastly.jsdelivr.net/npm/x-markdown-css@latest/dist/bundle.min.css`
 - CDNJS: *Coming soon. **Waiting for you to make `x-markdown-css` [popular enough](https://github.com/cdnjs/packages/blob/master/CONTRIBUTING.md#policy-rules-and-guidelines)**!*
 
-> *ps. `bundle.css` without `.min` stands for unminified version.*
+> *ps. Note that `bundle.css` without `.min` stands for unminified version.*
 
-2. A Sass / SCSS project
+2. A CSS (with Node.js) / Sass / SCSS project:
 
 First, install it with NPM ([PNPM](https://pnpm.io) or [Yarn](https://yarnpkg.com) also works):
 
@@ -34,15 +34,21 @@ First, install it with NPM ([PNPM](https://pnpm.io) or [Yarn](https://yarnpkg.co
 npm i x-markdown-css@latest
 ```
 
-Then, add it to your Sass / SCSS file (SCSS for example):
+Then, add it to your `.css` / `.sass` / `.scss` file.
 
-```scss
+For example, in CSS / SCSS you do:
+
+```css
 @import 'x-markdown-css';
 ```
 
-> *ps. No path or file extention is required, just simply use `x-markdown-css` to import it.*
+> *ps. Note that no path or file extention is required
+> since the `style` and `sass` field in `package.json` is filled.  
+> Just simply use `'x-markdown-css'` to import it.*
 
-## Uses
+## Built with
+
+The following tools and suite libraries made the development of `x-markdown-css` possible:
 
 - [SCSS](https://sass-lang.com)
 - [Stylelint](https://stylelint.io)

src/scss/markdown.scss

@@ -1,5 +1,5 @@
 .markdown-body {
-  color: var(--xm-c-general);
+  color: var(--xm-c-regular);
   font-family: var(--xm-font-display) !important;
   pre:not(.shiki, .highlight) {
     margin: 0;
@@ -10,7 +10,7 @@
   .highlight {
     margin: .5rem 0;
     font-size: 1.05rem;
-    font-family: var(--xm-font-mono) !important;
+    font-family: var(--xm-font-code) !important;
     line-height: 1.4;
     &.shiki-light {
       background: var(--xm-c-shiki-light) !important;
@@ -28,7 +28,7 @@
     text-decoration: none;
     transition: border .3s ease-in-out;
     &:hover {
-      border-bottom: 1px solid var(--xm-c-general);
+      border-bottom: 1px solid var(--xm-c-regular);
     }
     code {
       color: inherit;

src/scss/partials/_container.scss

@@ -1,6 +1,6 @@
 @mixin container {
   max-width: fit-content;
-  color: var(--xm-c-general);
+  color: var(--xm-c-regular);
   font-size: 1rem;
   line-height: 1.75;
 }

src/scss/partials/code.scss

@@ -1,8 +1,8 @@
 code {
-  color: var(--xm-c-dark);
+  color: var(--xm-c-deep);
   font-weight: 600;
   font-size: .875rem;
-  font-family: var(--xm-font-mono);
+  font-family: var(--xm-font-code);
   &::before,
   &::after {
     content: '`';

src/scss/partials/link.scss

@@ -1,5 +1,5 @@
 a {
-  color: var(--xm-c-darker);
+  color: var(--xm-c-deeper);
   font-weight: 500;
   text-decoration: none;
   code {

src/scss/partials/text.scss

@@ -3,11 +3,11 @@ p {
   margin-bottom: 1.25rem;
 }
 strong {
-  color: var(--xm-c-dark);
+  color: var(--xm-c-deep);
   font-weight: 600;
 }
 b {
-  color: var(--xm-c-dark);
+  color: var(--xm-c-deep);
 }
 em {
   color: inherit;

src/scss/partials/title.scss

@@ -1,7 +1,7 @@
 h1 {
   margin-top: 0;
   margin-bottom: .875rem;
-  color: var(--xm-c-darker);
+  color: var(--xm-c-deeper);
   font-weight: 800;
   font-size: 2.25rem;
   line-height: 1.15;
@@ -9,7 +9,7 @@ h1 {
 h2 {
   margin-top: 2rem;
   margin-bottom: 1rem;
-  color: var(--xm-c-dark);
+  color: var(--xm-c-deep);
   font-weight: 700;
   font-size: 1.5rem;
   line-height: 1.35;

src/scss/variables/_colors.scss

@@ -1,13 +1,18 @@
-$shiki-light: #f8f8f8;
-$shiki-dark: #0e0e0e;
-$link-border: hsla(0deg 0 50% / .3);
+// Colors
+$pre: #e5e7eb;
 $code: #111827;
+$figcaption: #6b7280;
+$thead: #111827;
 $ol-counter: #6b7280;
 $ul-counter: #d1d5db;
-$hr-border: hsla(0deg 0 50% / .3);
-$quote-border: hsla(0deg 0 50% / .3);
-$figcaption: #6b7280;
-$pre: #e5e7eb;
-$thead: #111827;
+
+// Border
+$link-border: hsla(0deg 0% 50% / .3);
+$hr-border: hsla(0deg 0% 50% / .3);
+$quote-border: hsla(0deg 0% 50% / .3);
 $thead-border: #d1d5db;
 $tr-border: #e5e7eb;
+
+// Shiki (code highlight)
+$shiki-light: #f8f8f8;
+$shiki-dark: #0e0e0e;

src/scss/variables/_constants.scss

@@ -1,5 +1,8 @@
+// Font stack
 $font-sans: 'Open Sans', 'Inter', 'Roboto', 'Helvetica', 'Arial', 'Sarasa Gothic TC', 'Sarasa Gothic SC', 'Noto Sans TC', 'Noto Sans SC', 'Microsoft JhengHei', 'Microsoft YaHei', -apple-system, sans-serif;
 $font-serif: 'Merriweather', 'Georgia', 'Times New Roman', 'Times', 'Source Han Serif Traditional Chinese', 'Source Han Serif Simplified Chinese', 'Noto Serif TC', 'Noto Serif SC', serif;
 $font-mono: 'DM Mono', 'Fira Code', 'Jetbrains Mono', 'Input Mono', 'Menlo', 'MesloLGS NF', 'Ubuntu', monospace;
 
+// Font defaults
 $font-display: var(--xm-font-sans);
+$font-code: var(--xm-font-mono);

src/scss/variables/_dark.scss

@@ -1,3 +0,0 @@
-$general: #bbb;
-$dark: #ddd;
-$darker: #fff;

src/scss/variables/_light.scss

@@ -1,3 +0,0 @@
-$general: #555;
-$dark: #222;
-$darker: #000;

src/scss/variables/modes/_dark.scss

@@ -0,0 +1,3 @@
+$regular: #bbb;
+$deep: #ddd;
+$deeper: #fff;

src/scss/variables/modes/_light.scss

@@ -0,0 +1,3 @@
+$regular: #555;
+$deep: #222;
+$deeper: #000;

src/scss/vars.scss

@@ -2,8 +2,9 @@
 
 @use 'variables/constants';
 @use 'variables/colors';
-@use 'variables/light';
-@use 'variables/dark';
+
+@use 'variables/modes/light';
+@use 'variables/modes/dark';
 
 :root {
   @each $name, $val in module-variables('constants') {