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Fix weekend tint: replace grayscale with 3% white overlay

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RCA finding: grayscale tints are imperceptible on near-black (#0a0a0a)
backgrounds. Deltas of 3-5 RGB units fall below human JND threshold
and OLED panels can clip them to identical output via gamma compression.

Changed from hsl(0 0% 5%) to hsl(0 0% 100% / 0.03) — a semi-transparent
white overlay that composites additively for visible contrast.

See .claude/context/RCA/rca-calendarbg.md for full investigation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Kyle 2026-03-13 10:21:24 +08:00
parent ebeaefe0c5
commit 3ead9cd25a
1 changed files with 4 additions and 4 deletions
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8
frontend/src/index.css
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@ -167,25 +167,25 @@
/* Weekend column tint */
.fc .fc-day-sat,
.fc .fc-day-sun {
background-color: hsl(0 0% 5%);
background-color: hsl(0 0% 100% / 0.03);
}
/* Weekend tint: header cells (higher specificity to override .fc-col-header-cell) */
.fc .fc-col-header-cell.fc-day-sat,
.fc .fc-col-header-cell.fc-day-sun {
background-color: hsl(0 0% 5%) !important;
background-color: hsl(0 0% 100% / 0.03) !important;
}
/* Weekend tint: timegrid column cells */
.fc .fc-timegrid-col.fc-day-sat,
.fc .fc-timegrid-col.fc-day-sun {
background-color: hsl(0 0% 5%);
background-color: hsl(0 0% 100% / 0.03);
}
/* Weekend tint: daygrid frame layer (paints above td background in FC6) */
.fc .fc-day-sat .fc-daygrid-day-frame,
.fc .fc-day-sun .fc-daygrid-day-frame {
background-color: hsl(0 0% 5%);
background-color: hsl(0 0% 100% / 0.03);
}
.fc .fc-col-header-cell {