You write in markdown. Markdown is plain text with a few punctuation marks that stand in for formatting, so a heading is a line that starts with #, and a list is a line that starts with -. The editor shows your raw text on the left and this rendered surface on the right. Nothing here is a hidden setting in a toolbar. What you type is what gets saved to the repository, and what gets saved is what the site reads.

Headings give a post its shape

A second-level heading like the one above starts with two hash marks. Use one when you start a new section. The theme gives it room above and pulls it close to the text that follows, so the heading reads as a label on the section it introduces.

Third-level headings sit inside a section

Three hash marks make a third-level heading. Reach for it when a section grows long enough to need its own subsections. Going deeper than this is usually a sign the post wants to be split in two.

Text you can emphasize, and links

Inside a paragraph you can make a word bold by wrapping it in two asterisks, or italic with one. Bold is for a term you want to stand out on a skim. Italic is for a lighter stress or a title. You can also link to anywhere, like the Unsplash photo library, by putting the link text in square brackets and the address in parentheses right after.

To link to another post or page on this same site, write cairn:posts/<id> instead of a full web address. The engine turns that into the live link when the page renders, so the link keeps working even if you later change the post's date or title. The about page is linked that way.

Lists, in two flavors

An unordered list is for items with no particular order. Start each line with a dash:

• Each item is one line that begins with a dash.
• Keep items short and parallel in shape.
• The theme draws a small accent diamond instead of a plain dot.

A numbered list is for steps that happen in sequence. Start each line with a number and a period, and let the editor count for you:

1. Write the first step.
2. Write the next one.
3. The numbers render in the display face, in the accent color.

A task list is a checklist. Add [ ] for an open item or [x] for a done one, right after the dash:

• Decide what the post is about
• Write a first draft
• Read it out loud and cut a third of it
• Publish

The boxes render as real checkboxes, fixed in place for reading. A reader sees at a glance what is done and what is left.

Quotes, set apart

A line that starts with > becomes a blockquote. Use it when you quote someone else at length, or set off a passage you want the reader to slow down for.

A good interface is like a joke. If you have to explain it, it is not that good.

When you want a single line from your own writing to land hard, make it a pull quote with the pull-quote component:

The line outdents into the margin on a wide screen and picks up an opening quotation mark in the accent color. Use it once in a post, at most. Its power comes from being rare. Give it {attribution="..."} when the line is not your own words.

Code, inline and in blocks

For a short snippet inside a sentence, wrap it in backticks, so a filename like cairn.config.ts reads as code. For anything longer, use a fenced block: three backticks, the language name, your code, then three more backticks. Naming the language turns on syntax highlighting, which the theme colors from the same palette as everything else.

// A render adapter is the one seam the engine asks each site to fill.
export function render(markdown) {
  return renderMarkdown(markdown);
}

The highlighting colors come from a small set of variables in the theme, the same ones that color the rest of the page. Change the palette and every code block recolors with it.

/* These tokens drive the whole reading surface. Edit them to re-skin the site. */
:root {
  --color-primary: oklch(55% 0.13 250); /* the accent */
  --font-display: 'Fraunces Variable', serif; /* headings and pull-quotes */
}

To see your changes, build the site and open it. One command does both:

npm run build && npm run preview

Tables, for anything with rows and columns

A table is rows of text separated by pipe characters, with a row of dashes under the header to mark it. The spacing in your raw text does not have to be tidy. The theme handles the alignment, the header rule, and the zebra striping.

Images, placed three ways

An image goes inside a figure, which is a block that holds the picture and its caption together. Wrap the image in :::figure and choose where it sits. The default is the text column. Add {.center} to keep it centered at the column width:

Add {.wide} to let the image break past the text column on a large screen, which suits a landscape:

Add {.full} for an image that spans the full width of the page, for a moment that deserves the room:

The caption is whatever text you put under the image inside the figure. In a finished site you would store your own pictures in the Media Library and reference them by a short media: handle instead of a web address, so the link never breaks when an image is renamed.

Components, for the things markdown cannot say

That horizontal rule above is three dashes on their own line. It marks a real break in the post.

Some things you want to say do not fit any plain markdown element. For those, this site ships a small set of components, and you drop them into your text with the same kind of block syntax as a figure. The first is a callout, for pulling one idea out of the flow. It comes in three tones.

A note is the calm one, for an aside or a definition:

A tip is for advice that will save the reader trouble:

A warning is for something the reader needs to be careful about:

The second component is an alert, for a caution set in a bordered card with an icon. It reads as a heavier signal than a callout, so save it for the rare note a reader must not miss:

The third component is an icon, a single glyph from the site's icon set for a short line that wants a marker of its own, with no card and no title:

Pick the glyph from the same picker the callout and alert icons use. An icon name outside the declared set is not a shape the site can draw, so it fails the build rather than rendering a blank one.

The fourth component is a video link. It never requests the video platform until a reader clicks through; before that it is a static panel naming where the link goes:

The fifth is a CTA, a single link styled like a button, for pointing the reader at the one next step that matters:

Read the getting-started guide

The sixth is an FAQ question, a native disclosure widget that works with no JavaScript. The answer takes full markdown, including a bold term or a link:

Changing the look

Everything you have seen draws its type, color, and spacing from one set of variables, the design tokens, in a single theme file. The accent color, the heading font, the width of the text column, and the rhythm between blocks are all named values you can edit in one place. Change --color-primary and the links, the list markers, the blockquote rule, and the callout accents all move together. The point of a surface like this is that the writing and the site stay in step, so a post written today still looks right after the next redesign.

You now know every element. Open the editor, start a post, and try them.

See the about page for more.