The system behind Jira, Confluence, and Trello: collaboration-neutral light UI with brand blue #1868db (evolved from the long-lived #0052cc), dark-navy #172b4d text, sunken #f7f8f9 wells, 8px-base spacing tokens, small 4–12px radii, and a fully tokenized elevation and color model that renders its palette live from design tokens.
Primary actionThe board-and-card idiom: white 8px-radius cards with the raised elevation token floating in sunken #f7f8f9 columns, under a navy-inked interface where the only strong color is Atlassian blue on actions and links.