PRODUCT.md records the durable constraints the UI work keeps having to rediscover: dark-first is binding (night reading), mobile is the target rather than the starting breakpoint, and updated_at ordering is a correctness rule the design must not decorate over. The two critique snapshots are the scored before/after (21/40, then 26/40) the card fixes were driven from — worth keeping as the record of which problems were already known, and which ones the fixes introduced. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Product
Platform
web
Users
Single user (self-hosted, no accounts, no multi-user planned). Reads manga on asurascans.com and demonicscans.org primarily via Bromite on mobile, also checks/updates from a desktop browser. The web UI is the cross-device view into progress captured by the userscript while reading.
Product Purpose
Tracks read-progress ("last chapter read") per manga series across two otherwise-unrelated manga sites that each have their own separate localStorage. A Go backend unifies bookmarks into one store; the web UI is a password-gated browser view of that store for reviewing, favouriting, correcting, or removing bookmarks, and jumping back into a series to continue reading. A background poller also refreshes each series' latest-published-chapter so the list can flag "NEW" without the user visiting the site.
Positioning
Not a public reading tracker or social app — a private, self-hosted sync layer purpose-built for two specific scraped sites, with no server-side account system (single bearer token + one password-gated session).
Operating Context
- Primary reading device: Bromite (mobile Chromium), where a userscript captures progress automatically.
- Web UI is a secondary surface: checking list state, correcting a wrong chapter number, removing dead bookmarks, jumping to "continue reading."
- Manga cover art and titles come from the source sites'
og:image/og:title— real content, not placeholders. - List order is driven by
updated_at, which moves only on real reading progress (not favouriting, not a newly detected chapter) — a UI constraint the redesign must not break.
Capabilities and Constraints
- Two tabs: All / Favourites. Search-filter by title (client-side,
filter.js). - Card actions: continue (opens source site), toggle favourite, manual chapter override, delete (with confirm).
- "Continue reading" horizontal strip for recently-progressed series.
- htmx-driven partial updates (card re-render on favourite/chapter/delete), no client-side framework/build step — templates are Go
html/template,go:embed-ed. - Mobile-first is a hard functional constraint (primary device is a phone), not just a starting breakpoint.
Brand Commitments
- Name: mangaBookmark.
- Dark-first is binding: current dark-by-default / light-follows-system-preference behavior must be preserved as a design constraint, not just a starting default, because reading happens at night.
Evidence on Hand
- Live templates/CSS at
backend/templates/*.html,backend/static/style.css— current implemented UI, functional but not yet treated as an intentional design system. - No logo, screenshots, or marketing copy exist; none should be fabricated.
Product Principles
- Dark-first, night-reading-optimized — never regress to a light-default or high-glare surface.
- Mobile is the primary target; desktop is an enhancement, not the design center.
- Progress data integrity over visual flourish:
updated_at/list-ordering behavior is a correctness constraint the UI must respect, not decorate over. - No accounts, no multi-tenant chrome — the whole product is for one reader.
- Prefer native platform affordances (system dark/light, native touch targets) over custom widgetry — this is a lean self-hosted tool, not a product to demo.
Accessibility & Inclusion
Explicit personal requirement: optimized for low-light/night reading — minimize glare and eye strain (true dark surfaces, restrained brightness/contrast on accents, no jarring pure-white flashes), beyond generic touch-target/contrast compliance.