System font stack: replace bare 'sans-serif' with system-ui / -apple-system
/ BlinkMacSystemFont / Segoe UI chain — sharper rendering on all platforms
at zero extra load cost.
Button hover/active: add transition (100ms) + color-mix hover brightening
+ active depression (translateY 1px) to all buttons. Previously buttons had
zero visual feedback on interaction.
Scrollbar styling: thin (6px) custom scrollbars via ::-webkit-scrollbar and
scrollbar-width/color for Firefox. Thumb uses border-color tinted with the
accent on hover — matches each theme automatically via CSS variables.
Phosphor theme: classic green-phosphor CRT aesthetic — near-black background,
#39ff14 neon-green accent, glow text-shadow on the freq display, matching
spectrum/waterfall canvas palette. Both dark and light variants included.
Registered in the style picker select, setStyle() valid list, and
CANVAS_PALETTE.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
sjg
5a3c013db5
