A list with a margin that reads whatever you are looking at. The cards scroll, a panel beside them stays put and renames itself to whichever card owns the middle of the screen, and on a narrow screen every card takes its name with it. One TSX file, no dependencies.
"use client";
/**
* The cards are only colour.
*
* On ktzm.dk a work card whose art has not been drawn yet falls back to a mesh
* built from the project's own accent, and those placeholders turned out to be
* the best-looking thing in the list. This demo is that fallback on its own,
* with the panel doing all of the talking, which is the case Marginalia was
* built for in the first place.
*
* The recipe is the site's, ported from a WebGL mesh gradient to layered
* radial gradients so the demo stays dependency-free: four stops from one
* accent (a shadow, the accent, a lift, and a stop that lands almost on the
* page), grain over the top, and a vignette to seat it in its frame. That last
* stop is what keeps a card from reading as a solid colour block. It gives the
* mesh somewhere to fall away to, so the shape shows.
*/
import Marginalia, { type MarginaliaItem } from "@/components/ui/marginalia";
const DEEP = "#10151b"; // shadow end
const PAPER = "#fafcfd"; // the page's own ground
type RGB = [number, number, number];
const parse = (hex: string): RGB => {
const h = hex.replace("#", "");
return [parseInt(h.slice(0, 2), 16), parseInt(h.slice(2, 4), 16), parseInt(h.slice(4, 6), 16)];
};
const mix = (a: RGB, b: RGB, t: number): RGB => [
Math.round(a[0] + (b[0] - a[0]) * t),
Math.round(a[1] + (b[1] - a[1]) * t),
Math.round(a[2] + (b[2] - a[2]) * t),
];
const css = (c: RGB, alpha = 1) => `rgba(${c[0]},${c[1]},${c[2]},${alpha})`;
/** Deterministic, so the card looks the same on the server and in the browser. */
const rng = (seed: number) => () => ((seed = (seed * 16807) % 2147483647) - 1) / 2147483646;
/**
* Film grain, as a tiled turbulence tile rather than a canvas.
*
* The `feComponentTransfer` is the part that matters. Raw fractal noise sits in
* a narrow band around mid grey, and mid grey is exactly what `overlay` leaves
* alone, so the obvious version of this renders perfectly and shows nothing.
* Stretching the channels to a full black-to-white range is what gives overlay
* something to work with.
*/
const GRAIN =
"url(\"data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3CfeComponentTransfer%3E%3CfeFuncR type='linear' slope='2.6' intercept='-0.8'/%3E%3CfeFuncG type='linear' slope='2.6' intercept='-0.8'/%3E%3CfeFuncB type='linear' slope='2.6' intercept='-0.8'/%3E%3C/feComponentTransfer%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E\")";
function Mesh({ accent, seed }: { accent: string; seed: number }) {
const a = parse(accent);
const deep = parse(DEEP);
const paper = parse(PAPER);
// The four stops, exactly as the site builds them.
const shadow = mix(a, deep, 0.72);
const lift = mix(a, [255, 255, 255], 0.42);
const fall = mix(a, paper, 0.82);
// One mesh, a different corner of it per card, so no two land on the same
// shape. The numbers are the site's own: a prime step so the sequence does
// not repeat across a page of them.
const r = rng(1009 + seed * 617);
const blob = (colour: string, size: number) =>
`radial-gradient(${(55 + r() * 45).toFixed(0)}% ${(50 + r() * 40).toFixed(0)}% at ${(r() * 100).toFixed(0)}% ${(r() * 100).toFixed(0)}%, ${colour} 0%, transparent ${size}%)`;
return (
<div style={{ position: "absolute", inset: 0, background: css(shadow), overflow: "hidden" }}>
<div
style={{
position: "absolute",
inset: "-10%",
backgroundImage: [
blob(css(fall, 0.95), 62),
blob(css(lift, 0.9), 58),
blob(css(a, 1), 66),
blob(css(lift, 0.55), 70),
blob(css(a, 0.9), 74),
].join(","),
filter: "blur(16px)",
}}
/>
{/* Grain. Over the colour, under the vignette, the way the shader runs it. */}
<div style={{ position: "absolute", inset: 0, backgroundImage: GRAIN, opacity: 0.13, mixBlendMode: "overlay" }} />
{/* Vignette, 0.22, to seat the picture in its frame. */}
<div style={{ position: "absolute", inset: 0, background: "radial-gradient(120% 120% at 50% 50%, transparent 42%, rgba(8,12,16,.22) 100%)" }} />
</div>
);
}
/**
* One key of the mesh per row. Every accent here is a colour the site actually
* spends somewhere, which is why they sit together: they were picked against
* each other rather than off a wheel.
*/
const keys: { id: string; name: string; note: string; hex: string; family: string; finish: string; aspect: string }[] = [
{ id: "verdigris", name: "Verdigris", note: "The house green. Everything the site signs its own name with is this.", hex: "#176247", family: "Green", finish: "Deep", aspect: "16 / 9" },
{ id: "emerald", name: "Emerald", note: "One step brighter and it stops being paint and starts being a signal.", hex: "#10b981", family: "Green", finish: "Lit", aspect: "16 / 9" },
{ id: "kiln", name: "Kiln", note: "Rust, a deeper relative of the orange. Warm ones read as a lamp; cool ones read as a screen.", hex: "#9c5033", family: "Red", finish: "Matte", aspect: "8 / 5" },
{ id: "flare", name: "Flare", note: "The one colour nothing else on the page is allowed to spend.", hex: "#e65f2e", family: "Orange", finish: "Lit", aspect: "16 / 9" },
{ id: "ochre", name: "Ochre", note: "Amber with the sugar taken out, so it can sit next to the green.", hex: "#c68a42", family: "Yellow", finish: "Matte", aspect: "10 / 7" },
{ id: "orpiment", name: "Orpiment", note: "Yellow dropped out of neon, which is the only way yellow survives a dark ground.", hex: "#c9b528", family: "Yellow", finish: "Deep", aspect: "16 / 9" },
{ id: "pool", name: "Pool", note: "Teal, picked for what sits on top of it: glass has nothing to refract over a flat field.", hex: "#14756b", family: "Green", finish: "Glazed", aspect: "8 / 5" },
{ id: "slate", name: "Slate", note: "The map colour. Cool enough to hold a white panel without competing with it.", hex: "#4d6b7c", family: "Blue", finish: "Matte", aspect: "16 / 9" },
{ id: "prussian", name: "Prussian", note: "The only stop that reads as a screen rather than as a surface.", hex: "#3178c6", family: "Blue", finish: "Lit", aspect: "10 / 7" },
{ id: "sand", name: "Sand", note: "A near-white plate pushed down until it has a body. A mesh built from white has nothing to shade with.", hex: "#a3937a", family: "Neutral", finish: "Matte", aspect: "16 / 9" },
{ id: "graphite", name: "Graphite", note: "What is left of black once you take the black out of it.", hex: "#3a4046", family: "Neutral", finish: "Deep", aspect: "16 / 9" },
];
const items: MarginaliaItem[] = keys.map((key, i) => ({
id: key.id,
title: key.name,
summary: key.note,
facts: [
{ label: "Hex", values: [key.hex.toUpperCase()] },
{ label: "Family", values: [key.family] },
{ label: "Finish", values: [key.finish] },
],
href: `#${key.id}`,
media: <Mesh accent={key.hex} seed={i} />,
aspect: key.aspect,
}));
/**
* No rail, no font, and one set of proportions.
*
* This is the layout the component was drawn for and the one the original page
* runs: a 334px margin, a 72px gutter, and cards that take everything left
* over and then 120px more, off the edge. A second column of small text beside
* the margin was tried here and it reads as a stray label rather than as part
* of the list, so the published demo leaves the rail empty.
*
* The demo sets no family and no size either, exactly as the component sets
* none: it wears whatever the page around it is wearing, and it asks the
* network for nothing at all, which is the difference between a demo that
* renders anywhere and one that renders where its font is reachable.
*
* Below the breakpoint the margin goes away and every card carries its own
* name underneath. That is the component's real answer to a narrow container,
* and squeezing the margin into one instead reads exactly as squeezed.
*
* The list scrolls with the page rather than inside a box of its own, which is
* how the original page runs it and what the panel's sticky column is for. It
* also decides what the listing's own hover video shows: 21st films a demo by
* scrolling the page, so a list that scrolls inside a box films as a still with
* a cursor drifting over it, and this one films as a pass down the list with
* the panel renaming itself. The other two demos keep their own boxes, so the
* inner-container path stays covered by the tests.
*
* The cards would push the page sideways, so the wrapper clips that axis. It
* uses `overflow-x: clip` and not `hidden`: `hidden` would make the wrapper a
* scroll container on both axes and the panel would stick to it instead of to
* the window.
*/
export default function MeshKeysDemo() {
return (
<div
data-demo-root
style={{
width: "100%",
background: PAPER,
color: "#14171a",
fontSize: 15,
}}
>
<div style={{ overflowX: "clip", padding: "clamp(22px, 3.6vw, 56px)" }}>
<Marginalia
items={items}
bleed={120}
stickyTop={100}
breakpoint={1100}
style={{
"--mg-muted": "rgba(20,23,26,.62)",
"--mg-faint": "rgba(20,23,26,.4)",
"--mg-surface": "rgba(12,16,24,.05)",
"--mg-wash": "rgba(255,255,255,.16)",
}}
/>
</div>
</div>
);
}