Font Pairing: Terminal CLI Monospace. Category: Mono + Mono (Single Family). Heading Font: JetBrains Mono. Body Font: JetBrains Mono. Mood/Style: terminal, cli, hacker, monospace, matrix, developer, retro-future, command line, precision, OLED. Best For: Developer tools, Web3/blockchain apps, hacker aesthetic, sci-fi games, ARG, security tools, geek-culture portfolios. Google Fonts URL: https://fonts.google.com/share?selection.family=JetBrains+Mono:ital,wght@0,400;0,500;1,400. CSS Import: @import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,400;0,500;1,400&display=swap');. Tailwind Config: fontFamily: { mono: ['JetBrains Mono', 'monospace'] }. Notes: Single monospace system: use ONLY JetBrains Mono (or SpaceMono-Regular as system fallback). Strict sizes: 12pt / 14pt / 16pt only — no in-between. Weight: 400 normal (bold ruins mono character). Line height: 1.2x font size for information density. Letter spacing: normal (monospaced auto-spacing). All UI labels uppercase. ASCII borders and text-based progress bars..