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hallmark/skill
YoussefandClaude Opus 4.7 a729b1707f Worked-examples first-card aligns with header · skill: N10 Floating-on-scroll nav
Two changes in one pass — site polish + skill expansion.

SITE: Worked-examples rail's first card now aligns with the
section header on initial paint. Was: rail used `padding-inline:
var(--page-gutter)` (~20 px), so Tide started flush against the
viewport's left gutter — out of column with the "02 / EXAMPLES"
label and "Worked examples." title above it. Now uses
`padding-inline: max(var(--page-gutter), calc((100vw -
var(--page-max)) / 2 + var(--page-gutter)))` so the first card's
left edge matches the page-content edge. As the user scrolls
horizontally, cards traverse the full bleed (right edge unchanged
— still extends to viewport). Trailing `::after` spacer also
uses the new `--rail-edge` so the last card snaps to matching
content edge.

SKILL: Added N10 Floating-on-scroll morph to the nav archetype
catalogue plus a dedicated `references/floating-nav.md` recipe.
The pattern: one DOM with two layers — `.nav` (outer) owns the
default bar visuals, `.nav__inner` (inner) owns the floating pill
visuals — cross-faded on a single `.is-floating` class toggle past
a scroll threshold.

Documents the four laws Hallmark refuses to break:

1. Total nav height stays constant (compensate inner shrink with
   outer padding-block math), or content below jitters.
2. Visible offset uses `transform: translateY()`, never margin or
   padding (those trigger layout and break Law 1).
3. Cross-fade ownership of every shared visual property (background,
   border, backdrop-filter, box-shadow). Forget one and you get
   ghost effects.
4. Single timing curve across every transitioning property —
   `cubic-bezier(0.16, 1, 0.3, 1)` at ~520 ms. Eight curves reads
   as eight animations.

Plus the property morph table (10 properties, one curve), the
scroll-handler script with passive listener + rAF throttle +
boolean-flip guard, and an 8-item slop list (the AI-default
mistakes Hallmark must not emit). N10's cookbook entry links to
floating-nav.md and stays brief — the deep recipe lives in one
focused reference file (~80 lines).

Skill grew by ~95 lines; one new file, one updated entry.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-06 14:28:34 +01:00
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