SURFACES: panes add black, surfaces INSIDE panes add white. Every pane stands
on 0.7075 black over the acrylic (.content 0.35 over .app 0.55), so a
translucent black card nets 0.81 - darker than its own pane and inside the
~0.85 band already rejected once on the artist page. Solid mode's ladder is
measured UPWARD from #121212 (+6/+18/+24), so glass elevates with WHITE: new
--glass-surface/-hover/-press/-hairline/-well/-ring under :root.glass
(0.03/0.08/0.11/0.10/0.18), which is independently the vocabulary
.btn-ghost:hover and .ax-ghost:hover already shipped. The four solid tokens are
NEVER redefined - they are consumed inside color-mix() and gradient stops where
an alpha multiplies through and kills the call site (0.74 x 0.03 = an invisible
chip; the album row's text-overflow fade works by BEING opaque), and they paint
modal chrome that has to stay solid. 129 additive :global(:root.glass)
declarations across 18 files, all 129 verified inside a glass block by walking
the diff - solid mode byte-identical, confirmed structurally, by computed style
with the class off, and visually.
Three of them are not colour swaps: the album row's .rowbtns shim was OCCLUDING
the last ~19px of the listeners bar and nothing translucent can occlude, so
.tcount masks out just before the buttons instead; Playlist's banner scrim and
the discography's pinned ambience both landed on opaque --bg-base and now
dissolve like the album banner; and the 0.9 black hero tint on
Home/CatalogSearch/Discography paints straight onto the pane when there is no
artwork, so :first-child (the {#if} renders no element) flips it to white.
Menus, dialogs, toasts and the import surfaces stay opaque deliberately, and
the Settings copy for the mode now says so instead of claiming cards do.
Measured with a known ground substituted behind the transparent window, since
CDP never sees the acrylic: library toolbar chroma +2 as shipped, +16 with a
white fill AND its backdrop-filter dropped, +30 for the bare pane beside it.
RESIZE: Windows drops the legacy accent-policy acrylic for the whole of a live
resize and the window stays transparent through it, so the desktop punches
through sharp - measured by toggling window_glass alone, desktop icon labels
readable through the titlebar. The blur cannot be kept (documented since Win10
2004, and the modern DWM backdrop was already rejected for the
overlay-promotion blink), so armGlassResizeGuard grounds the canvas to
--bg-sidebar for the length of the gesture.
STALLS: "choppy but the FPS says 144" was 200-750ms MAIN-THREAD TASKS, not
frame pacing - idle-scheduled work fires at scroll pauses by definition. Twin
bake moved to display resolution and off the ready task (was a same-task 4K
WebGL readback plus software blur, 100-170ms per rotation AND per artist
entry); gl.finish() -> gl.flush() in buildMaster, which had been draining the
whole 4K EASU/RCAS/grade chain on the main thread; copyCanvas realloc guarded;
one app-wide scroll clock in scrollbar.js (markAppScroll/appScrollIdleFor) so
all three periscopes stop cloning mid-gesture on ANY pane rather than only
their own; bounded reclone with the querySelectorAll census deleted, the gate
widened 250->1000ms, and the build/attach split across an idle callback and a
rAF behind a generation guard; the hero rotation tick gated on scroll recency
and its payload cache sized to the working set (2->4 entries, 24->32MiB,
32->64MiB); sessionTick no longer force-rewrites every 12s while merely PAUSED.
Scroll storm went from 109-616ms long tasks to zero. Hover recalc and GC were
measured innocent - do not re-chase them.
98/98 tests throughout.
Scroll-driven animation conversion
- apply() writes nothing per frame on the supported path; the hero
squeeze, fade line and header curves all ride scroll-driven animations
on the compositor.
- Section boundaries flip via IntersectionObserver sentinels; the scroll
listener is gone from the hot path.
- The scrollbar thumb rides its own scroll-driven animation.
- @supports-not fallback keeps the previous rAF --p path verbatim, so
unsupported engines render identically.
- Curves verified exact to 1e-6 against the old path, 0.000px continuity
across boundary flips, correct retarget on resize.
Perf fixes
- Forced-layout reads pulled out of both scroll handlers.
- Resize settle-reflow: a second reflow 200ms after resize quiesces, and
the pane is observed too. This was the root cause of the fullscreen
fade-wedge and of the long-standing intermittent where rows stayed
hidden after a resize.
Glass
- backdrop-filter removed from chips and preview surfaces.
- Bar glass blur 20 -> 12.
- Choose-hero pill removed from the UI; pickArtistHero/clearArtistHero
backend is untouched and the control can be re-homed later.
Hero design (final)
- Crossfade twins are permanent. Twin blur is baked via bakeBlur()
(clamp-to-edge pad -> blur -> crop) so the frames stay pixel-aligned
with no edge fringe and no geometry scaling.
- Bloom strip retired everywhere; HeroGpuCanvas's internal bloom canvases
are hidden by one scoped rule and the component is unchanged.
- Seam is a pure mirror: the artwork's top strip flipped inside the glass
band, clipped at the bar's top line, riding the squeeze with the hero
and dissolving in lockstep on rotation.
- GPU twin overlay crossfades on rotation instead of snapping — the
incoming baked frame fades in on hero-banner-in with a 2-frame cap.
- ~930 lines of experimental variants and the perf-flag system deleted;
the surviving path is a pixel no-op against the approved configuration.
Debug overlay
- PERF/SEAM rows dropped; the overlay keeps stats plus an FPS/drops/worst
counter (Ctrl+Shift+D).
The previous .git directory was found gutted (only info/ remained), so
history is unrecoverable locally. This commit restores version control
with the tree exactly as it stands: the working app, the preview-tracks
launcher on the artist hero, the scrollable-track-previews design bundle
(docs + approved mockups), and the Phase 0 validation artifacts.
KeelrLeek