ZenoAudit
Tamper-Evident Audit Trails
Storage-agnostic, cryptographically verifiable audit logging with Merkle tree proofs and post-quantum signatures.
- Five-level verification
- 8+ pluggable storage backends
- Post-quantum ready (Ed25519 + ML-DSA-65)
Brand guide · v2.0 draft
What is up to us, drawn in two shapes.
The Citium Software masterbrand: one mark, one copper accent and the shared Zeno type system. Everything here works in light mode, dark mode and one-colour print without a second version.
Logo
The Dichotomy mark
Epictetus opens the Enchiridion with the dichotomy of control: some things are up to us, others are not. The solid half is what you control (your keys, your data, your cluster). The copper arc is the world outside. The halves are offset because the two are never the same thing. Together they still read as one circle and as a C.
CitiumSoftwareprimary lockup · on white
CitiumSoftwareprimary lockup · on night, same copper
mark · colour
mark · reversed
one colour · stamp, emboss, etch
white on copper
Clear space
Keep a quarter of the mark's height clear on every side. In the lockup, measure from the mark and from the cap height of the wordmark.
16
24
32
64 px
Minimum size
Mark: 16 px on screen, 6 mm in print. Lockup: 96 px or 25 mm wide. Below 16 px the 4-unit gap closes, so use the favicon file, which is tuned for tabs.
Construction
48-unit grid, the same grid as every Zeno mark. A half-disc of radius 16, centred at (22, 27). An arc of radius 13.5 and stroke 5, centred at (26, 21). The gap is 4 units and the vertical offset is 6.
Don't
Recolour the arc. Copper is the only accent.
Rotate or mirror the mark.
Line the halves up. Aligned, it reads as a contrast icon.
Place it on mid-tone blues or photos without a plate.
Add shadows, gradients, glows or outlines.
Colour
Three midpoint colours
Copper, Patina and Aegean are each tuned to about 4.3:1 against both white and night. One hex works on light pages, dark pages and print, so the logo needs no dark-mode variant. Cyprus gave copper its name. Patina, oxidised copper, takes over the role of the old teal.
AaAa
Kition Copper
--ct-copper-500 · #BE60294.29:1 on white · 4.34:1 on nightLogo accent, one highlight per view, Citium call-to-action buttons.AaAa
Patina
--ct-patina-500 · #2F877D4.30:1 on white · 4.33:1 on nightSuccess and verified states only. Never decoration.AaAa
Aegean
--ct-aegean-500 · #3A74F04.25:1 on white · 4.38:1 on nightCharts and focus. Links use Zeno Blue 600 on light pages.| Semantic token | Light | Dark | Use |
|---|---|---|---|
--ct-bg | #FFFFFF | #0A1226 | Page background |
--ct-bg-subtle | #F6F8FC | #0D1730 | Alternate sections |
--ct-surface | #FFFFFF | #111C36 | Cards, panels |
--ct-text | #0B1530 | #E8EEF9 | Body and headings |
--ct-text-secondary | #5B6782 | #A3B1CC | Supporting text |
--ct-mark | #0B1530 | #FFFFFF | Logo primary shape |
--ct-accent | #BE6029 | #BE6029 | Logo arc, highlights |
--ct-product | #1A52D9 | #7EA9FA | Zeno product names and icons |
--ct-band | #0B1530 | #111C36 | Stats band, CTA, code |
Print: a straight conversion of Copper 500 gives CMYK 0 50 78 25. Choose the Pantone match from a physical swatch book and proof it on paper before ordering. For premium print, use copper foil on navy stock with the white mark.
Type
Manrope, Inter, JetBrains Mono
These are the same three open-source (SIL OFL) families as the Zeno products. They are self-hosted from brand/fonts/, so no page view triggers a request to a third-party font CDN.
DisplayManrope 800 · −0.035emYour keys stay in your jurisdiction.
HeadingManrope 800 · 39 pxThe Zeno Product Suite
WordmarkManrope 800 + 500CitiumSoftware
BodyInter 400 · 18/29
ZenoVault stores secrets in your own cluster. The root key is held in protected memory and never touches disk. Unsealing needs a quorum of key holders.
EyebrowInter 600 · 12 px · +0.14emEuropean Security Infrastructure
MonoJetBrains Mono 400
docker pull registry.citiumsoftware.com/zenoauth:latest
Components
Straight cuts, small radii
The shape language follows the mark: flat fills, hairline borders and radii of 4 to 10 px. Ink buttons carry the main action. A copper button appears at most once per view.
Buttons
Badges and links
Figures
<3ms
P99 Latency
Brand system
One parent, Zeno products
Every product keeps the Zeno prefix and its own line-drawn mark in Zeno Blue with a cyan dot. Citium endorses the products and never merges into a product mark. Copper is how you tell who stands behind them.
Masterbrand
CitiumSoftware
Solid mark, ink or white plus copper. Use it on the website, contracts, invoices, the trust centre and event stands.
Product
ZenoTunnelZenoAuth
Line-drawn on the same 48 grid with a 4 to 4.5 unit stroke. ZenoTunnel, ZenoAuth and ZenoCookieConsent already follow this; the other products move to it next.
Endorsement
A Citium Software product
Product footers, docs and installers carry the small mark with one line of text.
Voice
Calm, precise, candid
We write like an engineer explaining a design to a peer: short sentences, real numbers, the mechanism before the claim. Stoic means calm, not cold. We don't sell fear.
Do
Don't
"The root key lives in protected memory and never touches disk."
"Military-grade, unbreakable security."
"34,000+ requests per second", next to a link to how we measured it.
"The world's fastest ingress controller."
"Built in Denmark. Runs on your infrastructure."
"Escape American surveillance!"
"Anycast is on the roadmap. It isn't live yet."
"Trusted by thousands of teams."
Files
Assets in the repository
All logo files are generated from brand/concepts/generate.py. Edit the geometry there, never by hand in the SVG files.
brand/logo.svgPrimary lockup for light backgroundsbrand/logo-white.svgPrimary lockup for dark backgroundsbrand/logo-mark.svg Mark on light · logo-mark-white.svg on darkbrand/favicon.svgBrowser tab icon; follows the system light or dark settingbrand/concepts/dichotomy-mono-*.svgOne-colour black or white, for stamps, embossing and etchingbrand/tokens.cssColour, type and spacing tokensbrand/fonts.cssSelf-hosted font faces (OFL licences in brand/fonts/)brand/logo-lab.htmlThe five original concepts and the reasoning behind the choiceBefore print: the lockup SVGs set the wordmark as live text. Outline it in a vector tool with Manrope installed before the files go to a printer.