Most resumes separate sections with horizontal rules, which cut the page into strips and burn vertical space you do not have. Left Rule turns the line ninety degrees: a 3px accent border runs down each entry, so grouping is shown by what shares a spine rather than by what sits between two lines. Nothing is spent on separator height, and a long experience section still reads as one column of related blocks.

The section titles sit outside the rail — flush left, uppercase, widely letterspaced, in the accent. That one indent difference is what makes the device read as a margin rail instead of a quote block, and it gives the eye a reliable place to find the next heading while scanning.

The summary and skills carry the same rule in a dusty, tinted version of the accent. Prose gets a softer mark than a dated entry, so the page has two levels of emphasis without introducing a second color.

The spine costs about 21px of horizontal room on every line, so a resume already fighting for space loses roughly one word per bullet — Jake's or Compact fit more. And because the rail is drawn per block, a Word download shows it as a mark on each entry's first line rather than one unbroken rule: if the exact look matters to you, send the PDF.