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Two related fixes that share root cause: shadcn's neutral palette
collapses `secondary` / `muted` / `accent` to the SAME L 96.1% value
intentionally — it's a single tonal slot whose semantic name varies by
use case, not three different colors. Stacking a bg-muted child on a
bg-secondary parent (which is what we were doing for code/table headers
inside the comment bubble) made the inner element visually disappear.
Introduce a proper 5-tier elevation scale calibrated to Refactoring UI
and Material 3 guidance:
L 100 page bg / card / popover (page floor)
L 98 surface-1 NEW (subtle elevated — comment
bubbles, iOS settings-cell
feel: visible boundary
via radius + border, fill
is almost-page)
L 96.1 secondary / muted / accent (shadcn default, untouched —
button hover, chips, skeleton)
L 90 surface-2 NEW (nested inside surface-1 —
table headers + code blocks
inside comment bubbles, 8% L
step over surface-1)
L 84 border (was 89.8% → 84%) (visible across every tier,
6-16% darker than adjacent
surface, within Refactoring
UI's 5-10% guideline)
Dark mirror flips the lightness direction (higher elevation = lighter):
page 3.9 → surface-1 8 → secondary 14.9 → surface-2 19 → border 25.
Applied across three files:
- global.css + tailwind.config.js + lib/theme.ts mirror the new tokens
(CSS variables, Tailwind class map, TypeScript export — they must
stay in sync per CLAUDE.md §5).
- components/issue/comment-card.tsx switches the bubble bg from
`bg-secondary` (too prominent, same color as inner muted elements)
to `bg-surface-1` (subtle, 8% lighter than inner surface-2).
- lib/markdown/markdown-style.ts:
- table.headerBackgroundColor + codeBlock.backgroundColor:
`t.muted` → `t.surface2`, so they're framed against the bubble.
- inline `code:`: REVERT 2026-05-19's `color: t.brand` workaround
for upstream enriched-markdown #255. The brand-tint avoided the
chip's top-heavy padding artifact but broke Refactoring UI's #1
rule (color carries semantic meaning — brand IS the link color,
users reported tapping inline code thinking it was a link).
Re-enable bg-chip + foreground text, matching GitHub mobile /
Slack / Notion / Apple Notes. The padding artifact is the lesser
evil; in surface-2 (L 90%) on surface-1 (L 98%) the chip is
subtle enough that the few pixels of asymmetry are unobtrusive.
The shadcn `secondary` / `muted` / `accent` tokens stay at L 96.1%
unchanged — other call sites (button hover, skeleton, avatar fallback,
chips) all work fine on their own and were never the problem.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>