feat(ui): dark tech theme — emoji-free chrome, subtle animated CSS background, WCAG AA dark palette
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# Phase 08 — Story: Dark Tech Theme
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**Story:** `.agent/user_stories/dark-tech-theme.md`
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**Context:** `.agent/PLAN.md` §7 (UI/UX strategy), §10 (testing)
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## Goal
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Re-skin the whole UI to a dark, techy, emoji-free look with a subtly
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animated pure-CSS background — zero behavior or layout changes, WCAG 2.1
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AA re-proven on the new palette.
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## Dependencies
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Phases 01–07 (all complete). Independent of 09/10; phase 10's viewer page
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inherits this theme, so 08 must land first.
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## Locked decisions
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No anchors changed. Replaces the §7.2 light contrast pairs with the dark
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palette below (PLAN §7.2 already updated 2026-08-21 with owner
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permission). No new technology — pure CSS/HTML/inline SVG (A11).
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## Implementation steps
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1. **Palette swap** — `frontend/assets/styles.css` `:root` tokens (all
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pairs computed, ≥4.5:1):
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| token | dark value | computed pair |
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|---|---|---|
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| `--bg` | `#0a0e17` | ink on bg 16.2:1 |
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| `--surface` | `#121a2e` | ink on surface 14.5:1 |
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| `--ink` | `#e8ebf4` | — |
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| `--ink-soft` | `#9aa4bd` | ink-soft on surface 6.9:1 |
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| `--line` | `#26304a` | decorative |
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| `--brand` | `#6d78f2` | **dark ink `--bg` on brand 5.2:1** |
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| `--brand-soft` | `#232b52` | brand-ink on brand-soft 6.9:1 |
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| `--brand-ink` | `#a5b4fc` | brand-ink on surface 8.7:1 |
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| `--accent-bg` | `#2b2110` | accent-ink on accent-bg 9.5:1 |
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| `--accent-ink` | `#fbbf24` | — |
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| `--accent-line` | `#f59e0b` | unchanged (8.9:1 on bg) |
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| `--err-bg` / `--err-ink` | `#2d1318` / `#fca5a5` | 9.1:1 |
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| `--err-line` | `#ef4444` | 4.6:1 on err-bg (UI boundary) |
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| `--ok-bg` / `--ok-ink` | `#10241b` / `#6ee7a8` | 10.6:1 |
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Button text is `--bg` (dark) on `--brand` — **never white on brand**
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(3.7:1, fails). Busy button: keep the `#a5b4fc` background (the
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`tests/unit/test_frontend_feedback.py` assertion greps this token)
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with a **dark** arc (`--bg`, 9.7:1). Update derived light-mode values:
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shadows (black-based, lower alpha), selection, typing dots, chip
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hover.
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2. **Emoji purge** — replace every emoji in chrome with inline SVG
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(`aria-hidden` kept, ~16–20px, `currentColor` where sensible):
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- `frontend/assets/app.js` (~L116, ~L132): avatars 🧠/🧑 → SVG
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circuit-node glyph (brain) / minimal silhouette (user) as JS string
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constants.
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- `frontend/index.html`: favicon 🧠 data-URI → SVG tech mark (hex +
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node, brand color on dark, <1 KB), still a `data:` URI;
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`.brand-mark` 🧠 → same mark; ⚠️ banner icon → SVG triangle; 👋
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empty state → SVG glyph.
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- `frontend/sources.html`: favicon, `.brand-mark`, 📂 empty state →
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SVG marks.
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3. **Tech details** — mono wordmark with letter-spacing; stat values
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mono; radii `10px`/`6px`; 1px `--line` borders on cards/bubbles/table;
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2px gradient hairline (brand→cyan, low alpha) under the sticky header.
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4. **Animated background (pure CSS, zero JS)** — working recipe:
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`html { background: var(--bg) }`, `body { background: transparent;
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position: relative }` (body must not create a stacking context):
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- `body::before` — fine grid: two `linear-gradient`s (1px lines,
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`--line` at ~35% alpha), `background-size: 44px 44px`, masked with a
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radial fade (visible center-top, fading to the edges), animated
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`background-position` `0 0 → 44px 44px`, 60s linear infinite
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(seamless loop — the delta equals one cell).
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- `body::after` — two large soft radial glows: indigo
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`rgba(109,120,242,0.14)` top-left, cyan `rgba(34,211,238,0.10)`
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bottom-right; 14s ease-in-out infinite alternate breathing
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(opacity/scale). No `filter: blur` (perf).
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- Both: `position: fixed; inset: 0; pointer-events: none; z-index:
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-1`. Keep glow alpha low — subtle, never competing with text.
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5. **Reduced motion** — `@media (prefers-reduced-motion: reduce)`:
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`body::before, body::after { animation: none }` (static grid + glows
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remain). Existing typing/spinner reduced-motion handling stays.
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6. **Test updates (behavior unchanged):**
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- `tests/e2e/test_honest_deflection.py` (~L104): deflection bubble
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`backgroundColor` assertion `rgb(255, 247, 232)` → `rgb(43, 33,
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16)`; the border assertion `rgb(245, 158, 11)` is unchanged.
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- New integration test
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`tests/integration/test_api.py::test_ui_chrome_has_no_emoji`: GET
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`/`, `/sources.html`, `/assets/app.js`, `/assets/styles.css` — assert
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no characters in the emoji code-point set (U+1F300–U+1FAFF,
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U+2600–U+27BF, U+2B00–U+2BFF, U+FE0F, U+200D, plus the specific
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glyphs previously used: 🧠 🧑 👋 📂 ⚠️).
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7. **PLAN.md §7.2** — dark contrast table already applied (2026-08-21,
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owner permission); no further plan edits in this phase.
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## UI Verification
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Manual screenshot pass (1280px + 375px, both pages): grid is faint
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(barely-there), glows soft, no banding; brand button legible (dark
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text); deflection bubble distinct from normal answers; avatars crisp at
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16px; reduced-motion preview (DevTools emulation) shows the static
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background.
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## Testing & Quality
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- Integration: no-CDN check still green on both pages (it covers
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`/sources.html` since Phase 07); new emoji-guard test above.
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- **Existing E2E regression check:** after the reskin, run the existing
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story suites in isolation and confirm they stay green — at minimum
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`test_chat_rag.py`, `test_honest_deflection.py`, `test_responsive_
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polish.py` (the contrast helper computes from live styles and must pass
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on the new palette).
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- Coverage: `uv run pytest --cov=app --cov-report=term-missing` — **>90%**
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on `app/`.
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- `uv run ruff check . && uv run pyright` green.
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## Playwright Execution Phase
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Run ONLY this story's suite:
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```bash
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uv run pytest tests/e2e/test_dark_tech_theme.py -v --no-cov
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```
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Implements the story mapping: dark bg + computed contrast pairs ≥4.5:1;
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no emoji in innerText/outerHTML on both pages; `body::before`/`::after`
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animate; reduced-motion context → `animation-name: none`; on-topic smoke
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(stream + chip + button recovery) unchanged; all assets local.
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## Success criteria
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- [ ] both pages dark; every text pair ≥4.5:1 (computed in E2E)
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- [ ] zero emoji in chrome (E2E + new integration guard)
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- [ ] animated background subtle, pure CSS, reduced-motion honored
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- [ ] layout metrics + chat behavior unchanged (smoke E2E)
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- [ ] existing story E2E suites still green in isolation
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- [ ] unit + integration green, coverage >90%, ruff + pyright green
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- [ ] committed (force-add `.agent/PLAN.md` + this phase record — rule 8)
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## Commit
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```bash
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git add -A
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git add -f .agent/PLAN.md .agent/phases/todo/08_story_dark_tech_theme.md
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git commit --no-gpg-sign -m "feat(ui): dark tech theme — emoji-free chrome, subtle animated CSS background, WCAG AA dark palette"
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```
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