Sandbox /2/ — the system pass.

Interface reinvention, line B. The design language is Ledger — ink on light, Swiss grid discipline, IBM Plex; ink is the action color, hue carries meaning only. The frame is one bar: areas always visible, the path continues after them, every path segment opens its siblings. Durable reasoning: docs/interface-reinvention-plan-b.md.

Open the prototype → shell.html

One-bar frame over four working surfaces: Home (queue-first morning view), Ship › Workbench (queue archetype), Sell › Orders (list archetype), and an order's living page with its relations rail. Mock data throughout — safe to click anything.

Walk in ›

Two-minute walkthrough

Press Ctrl+K and type 40412 — jump straight to the order from anywhere.
In the bar, click Orders ▾ — every sibling page and the area's Configure links live there.
Alt+1…6 switch areas; each area remembers where you left it.
Open the order, hover the PO-1187 chip, then jump to Money via the invoice chip — the relations rail is the spine made clickable.
Try the Comfortable/Compact density toggle — it persists.

Ground rules for this line

Everything derives from verified system facts and Adam's ratified decisions — see plan-b §1 and §6.
Dark mode is dropped from scope: one standard interface.
Playground is world-open HTTP and unversioned — mock data only, never real customer data.