Swaps the stepped-path mark for the "C1 v2" design: an 8x8 grid of graded
day-cells tracing the same climb (blue Low -> green Normal -> a hot loop -> a
stepped ascent to the near-record red cell). It keeps the exact geometry of the
old mark — same 512 viewBox, same 32/448/rx96 rounded badge, same band palette —
so it is a drop-in that needs no alignment changes.
Everywhere the mark appears:
- The inline header SVG in all six lockups (the five standalone frontend pages
and backend/templates/base.html.j2), kept at width/height 28 with aria-hidden.
Because the box and viewBox are unchanged, the .logo/.brand alignment CSS
(the -2px cap-height nudge, the 28->22px compact size, the 10px gap) is
untouched and the mark stays centred on the "Thermograph" wordmark.
- favicon.svg, regenerated from the new art.
- Every raster: favicon-16/32/48, apple-touch-icon (180), logo-192, logo (512),
and the two maskable icons. The maskable pair keeps the established recipe —
the badge scaled into the central safe zone on a full-bleed opaque square — so
an OS shape mask never clips the art.
Bumps every icon reference to ?v=3 (previously a mix of ?v=2 and unversioned) so
browsers and installed PWAs refetch the new icons.
Claude-Session: https://claude.ai/code/session_013dRZmX9D3JEntfMKWMTWZ8
The mark is a quantized climb through the temperature-band tokens
(cold -> cool -> normal -> warm -> hot -> very-hot) to a rec-hot
terminal at a dashed record line, on the dark rounded tile.
- favicon.svg (canonical) + favicon-16/32/48.png fallbacks; the 16px
raster drops the whisper strata and record dash so the climb survives
- apple-touch-icon.png 180 rendered edge-to-edge (iOS supplies rounding)
- maskable 192/512 scale the artwork 0.78 about center so every element
clears the 40%-radius circular safe zone; any-purpose 192/512 and the
512 OG logo.png regenerated; reused filenames cache-busted with ?v=2
- header lockup: inline glyph referencing var(--cold) etc so a palette
change propagates, beside a lowercase 650-weight wordmark
- PNGs are palette-quantized with the band/chrome hexes pinned exact;
full asset set is ~20 KB
Claude-Session: https://claude.ai/code/session_01KdTZCjpLeD26ZbXe6ApjpR
Sharing a Thermograph URL (Discord, Slack, iMessage…) now unfurls into a
card with the site name, page title, description, accent color, and logo.
- All five pages get description/theme-color/og:*/twitter:card meta and a
favicon. og:url/og:image need absolute URLs and crawlers don't run JS, so
pages carry an __ORIGIN__ placeholder the server fills in per request from
X-Forwarded-Proto (Caddy) / scheme + the Host header + base path — correct
on both the LAN dev server and the prod domain without hardcoding either.
- New logo assets: the header's ▚ mark as an app icon (accent quadrants on
the dark surface) — logo.png (512x512, the og:image) and logo.svg (favicon).
- Page routes render the substitution with a weak ETag + 304 revalidation
(replacing plain FileResponse) and now answer HEAD, which preview crawlers
probe with (previously 404).
