Rework the CRT raster, glow and flicker effects
The three effects had drifted apart from each other and from the token system. Consolidate them behind --crt-* tokens and fix what was broken. - The animated text-shadow silently overrode the static one, so reduce-motion users saw a 5px white glow and everyone else a 3px currentColor glow. Both now come from one declaration, with the aberration offset factored out into --crt-shift. - Step the aberration instead of tweening it. text-shadow is not compositable and this one inherits to every glyph, so the smooth version repainted the whole document at refresh rate. - The flicker was invisible: a near-black tint at an effective alpha of 0.008-0.096 over a black background, a peak lift of under 2/255. Retint with the accent at ~3%. - Anchor the vignette to the viewport. It was sized to body's box, which is document-height, so on long pages the bloom sat off-screen. - Pin the overlays with position: fixed rather than painting document-sized layers, and give the grille hard stops so it is three stripes rather than a smooth R->G->B ramp. - Scale the raster pitch down at >=2dppx, where a 2px scanline is 4 device px and resamples into moire at fractional DPR. - Raise --color-mg to oklch(0.62): at 0.5 it was 3.5:1 on the background and 1.7:1 over the vignette centre. Halve the vignette alpha via its own token, keeping --color-accent-transparent at 50% for ProjectCard's glow. Collapses the two keyframe blocks from 193 lines to 40. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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2 changed files with 158 additions and 166 deletions
274
public/theme.css
274
public/theme.css
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@ -39,12 +39,21 @@ html {
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width: 100%;
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height: 100%;
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}
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/* The aberration is a discrete jitter, so it is stepped rather than
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interpolated: step-end repaints 21 times per cycle instead of once per
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frame. text-shadow is not compositable, and this one inherits to every
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glyph on the page, so a smooth tween would repaint the whole document at
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refresh rate. Stepping also reads more like chroma noise than a ramp does. */
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body {
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animation: textShadow 1.6s infinite;
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animation: crt-aberration 1.6s step-end infinite;
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/* Anchors the vignette to the viewport. Without it the gradient is sized to
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body's box, which is document-height, so on a long page its centre sits
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at the middle of the document and the bloom is off-screen at scroll-top. */
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background-attachment: fixed;
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background-color: var(--color-bg);
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background-image: radial-gradient(
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var(--color-accent-transparent),
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black 120%
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var(--crt-vignette-core),
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var(--crt-vignette-edge) 120%
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);
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color: var(--color-fg);
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column-gap: var(--gutter-large);
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@ -58,46 +67,56 @@ body {
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position: absolute;
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right: 0;
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row-gap: var(--stack-large);
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text-shadow: 0 0 5px var(--color-glow);
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/* Single source of truth for the glow: when the animation is off,
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--crt-shift is 0 and this is exactly the static glow. Previously the
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animation overrode a separate `0 0 5px var(--color-glow)` rule, so
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reduce-motion users saw a 5px white glow and everyone else a 3px
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currentColor one — two looks nobody had chosen. */
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text-shadow:
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calc(var(--crt-shift, 0) * var(--crt-aberration-max)) 0 1px
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var(--crt-shadow-cool),
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calc(var(--crt-shift, 0) * var(--crt-aberration-max) * -1) 0 1px
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var(--crt-shadow-warm),
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0 0 var(--crt-glow-blur) var(--color-glow);
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top: 0;
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}
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/* Fixed rather than absolute: these used to be document-sized layers that
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relied on background-attachment to keep the pattern still. Pinning them to
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the viewport gets the same effect while bounding the painted layer, and it
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covers the screen regardless of how tall the content is. */
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body::before,
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body::after {
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content: " ";
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display: block;
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position: absolute;
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top: 0;
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left: 0;
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bottom: 0;
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right: 0;
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background: rgba(18, 16, 16, 0.1);
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background-attachment: fixed;
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opacity: 0;
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z-index: 2;
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content: "";
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inset: 0;
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pointer-events: none;
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animation: flicker 15s infinite;
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position: fixed;
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z-index: 2;
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}
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/* Scanlines and aperture grille. repeating-linear-gradient with hard stops
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replaces background-size tiling: the grille used to be a smooth R->G->B
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ramp across 3px, where a real grille is three discrete stripes. */
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body::before {
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content: " ";
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display: block;
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position: absolute;
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top: 0;
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left: 0;
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bottom: 0;
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right: 0;
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background:
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linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%),
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linear-gradient(
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background-image:
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repeating-linear-gradient(
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transparent 0 calc(var(--crt-scanline-pitch) / 2),
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var(--crt-scanline-color) 0 var(--crt-scanline-pitch)
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),
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repeating-linear-gradient(
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90deg,
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rgba(255, 0, 0, 0.06),
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rgba(0, 255, 0, 0.02),
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rgba(0, 0, 255, 0.06)
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var(--crt-grille-r) 0 calc(var(--crt-grille-pitch) / 3),
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var(--crt-grille-g) 0 calc(var(--crt-grille-pitch) / 3 * 2),
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var(--crt-grille-b) 0 var(--crt-grille-pitch)
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);
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z-index: 2;
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background-size:
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100% 2px,
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3px 100%;
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background-attachment: fixed;
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pointer-events: none;
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}
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/* Phosphor flicker. The old version tinted with rgba(18, 16, 16, 0.1) at
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0.08-0.96 opacity: an effective alpha of 0.008-0.096 of a colour ~7%
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lighter than the background, i.e. a peak lift of under 2/255. It was
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invisible. Tinting with the accent at ~3% is small enough to cost no
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measurable contrast and large enough to actually see. */
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body::after {
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animation: crt-flicker 3s step-end infinite;
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background: var(--color-accent);
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opacity: var(--crt-flicker-base);
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}
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:root[data-reduce-motion="on"] body,
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:root[data-reduce-motion="on"] body::after {
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@ -132,197 +151,122 @@ body::before {
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animation: none;
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}
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}
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@keyframes flicker {
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@keyframes crt-flicker {
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0% {
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opacity: 0.27861;
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opacity: 0.03;
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}
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5% {
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opacity: 0.34769;
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7% {
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opacity: 0.024;
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}
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10% {
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opacity: 0.23604;
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13% {
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opacity: 0.041;
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}
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15% {
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opacity: 0.90626;
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19% {
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opacity: 0.028;
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}
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20% {
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opacity: 0.18128;
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26% {
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opacity: 0.019;
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}
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25% {
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opacity: 0.83891;
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31% {
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opacity: 0.036;
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}
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30% {
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opacity: 0.65583;
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38% {
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opacity: 0.026;
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}
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35% {
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opacity: 0.67807;
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44% {
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opacity: 0.048;
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}
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40% {
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opacity: 0.26559;
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51% {
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opacity: 0.022;
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}
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45% {
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opacity: 0.84693;
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58% {
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opacity: 0.033;
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}
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50% {
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opacity: 0.96019;
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}
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55% {
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opacity: 0.08594;
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}
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60% {
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opacity: 0.20313;
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}
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65% {
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opacity: 0.71988;
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63% {
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opacity: 0.017;
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}
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70% {
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opacity: 0.53455;
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opacity: 0.039;
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}
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75% {
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opacity: 0.37288;
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77% {
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opacity: 0.027;
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}
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80% {
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opacity: 0.71428;
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83% {
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opacity: 0.044;
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}
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85% {
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opacity: 0.70419;
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}
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90% {
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opacity: 0.7003;
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}
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95% {
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opacity: 0.36108;
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91% {
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opacity: 0.021;
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}
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100% {
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opacity: 0.24387;
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opacity: 0.03;
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}
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}
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@keyframes textShadow {
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/* Normalised from the original per-keyframe pixel offsets, divided by their
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max (3.8969px), so the rhythm is unchanged but the amplitude is now set in
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one place by --crt-aberration-max. */
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@keyframes crt-aberration {
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0% {
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text-shadow:
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0.4389924193300864px 0 1px rgba(0, 30, 255, 0.5),
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-0.4389924193300864px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.113;
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}
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5% {
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text-shadow:
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2.7928974010788217px 0 1px rgba(0, 30, 255, 0.5),
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-2.7928974010788217px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.717;
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}
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10% {
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text-shadow:
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0.02956275843481219px 0 1px rgba(0, 30, 255, 0.5),
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-0.02956275843481219px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.008;
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}
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15% {
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text-shadow:
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0.40218538552878136px 0 1px rgba(0, 30, 255, 0.5),
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-0.40218538552878136px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.103;
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}
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20% {
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text-shadow:
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3.4794037899852017px 0 1px rgba(0, 30, 255, 0.5),
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-3.4794037899852017px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.893;
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}
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25% {
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text-shadow:
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1.6125630401149584px 0 1px rgba(0, 30, 255, 0.5),
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-1.6125630401149584px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.414;
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}
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30% {
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text-shadow:
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0.7015590085143956px 0 1px rgba(0, 30, 255, 0.5),
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-0.7015590085143956px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.18;
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}
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35% {
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text-shadow:
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3.896914047650351px 0 1px rgba(0, 30, 255, 0.5),
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-3.896914047650351px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 1;
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}
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40% {
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text-shadow:
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3.870905614848819px 0 1px rgba(0, 30, 255, 0.5),
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-3.870905614848819px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.993;
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}
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45% {
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text-shadow:
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2.231056963361899px 0 1px rgba(0, 30, 255, 0.5),
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-2.231056963361899px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.573;
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}
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50% {
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text-shadow:
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0.08084290417898504px 0 1px rgba(0, 30, 255, 0.5),
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-0.08084290417898504px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.021;
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}
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55% {
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text-shadow:
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2.3758461067427543px 0 1px rgba(0, 30, 255, 0.5),
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-2.3758461067427543px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.61;
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}
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60% {
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text-shadow:
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2.202193051050636px 0 1px rgba(0, 30, 255, 0.5),
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-2.202193051050636px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.565;
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}
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65% {
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text-shadow:
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2.8638780614874975px 0 1px rgba(0, 30, 255, 0.5),
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-2.8638780614874975px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.735;
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}
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70% {
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text-shadow:
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0.48874025155497314px 0 1px rgba(0, 30, 255, 0.5),
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-0.48874025155497314px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.125;
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}
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75% {
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text-shadow:
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1.8948491305757957px 0 1px rgba(0, 30, 255, 0.5),
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-1.8948491305757957px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.486;
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}
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80% {
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text-shadow:
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0.0833037308038857px 0 1px rgba(0, 30, 255, 0.5),
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-0.0833037308038857px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.021;
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}
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85% {
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text-shadow:
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0.09769827255241735px 0 1px rgba(0, 30, 255, 0.5),
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-0.09769827255241735px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.025;
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}
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90% {
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text-shadow:
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3.443339761481782px 0 1px rgba(0, 30, 255, 0.5),
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-3.443339761481782px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.884;
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}
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95% {
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text-shadow:
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2.1841838852799786px 0 1px rgba(0, 30, 255, 0.5),
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-2.1841838852799786px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.56;
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}
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100% {
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text-shadow:
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2.6208764473832513px 0 1px rgba(0, 30, 255, 0.5),
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-2.6208764473832513px 0 1px rgba(255, 0, 80, 0.3),
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0 0 3px;
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--crt-shift: 0.673;
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}
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}
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header,
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