A loading pattern that reveals content in order of importance — layout first, then primary text, then secondary text, then details — using typographically-true placeholders so nothing shifts when the real content resolves.
"use client";
import {
Reveal,
RevealProvider,
useTierSchedule,
type Tier,
} from "@/components/ui/progressive-reveal";
import { useState } from "react";
type Mode = "cards" | "list" | "article";
type Speed = "instant" | "fast" | "slow" | "fail";
const SCHEDULES: Record<Speed, [number, number, number]> = {
instant: [40, 70, 110],
fast: [260, 480, 760],
slow: [900, 2100, 3600],
fail: [900, 2100, 3200],
};
const PROJECTS = [
{
name: "Vitrine",
mark: "A",
tone: "#b4532a",
open: 12,
label: "open issues",
desc: "The GUtech Studio platform: projects, deploys and search.",
updated: "4m ago",
spark: [3, 5, 4, 7, 6, 9, 8],
},
{
name: "Wayfinder",
mark: "W",
tone: "#2f6bff",
open: 5,
label: "open issues",
desc: "Indoor maps and room search for the Halban campus.",
updated: "2h ago",
spark: [2, 2, 3, 2, 4, 3, 5],
},
{
name: "Thesis",
mark: "T",
tone: "#16a34a",
open: 3,
label: "chapters left",
desc: "Survey tooling and analysis for the final-year thesis.",
updated: "yesterday",
spark: [1, 3, 2, 2, 4, 5, 4],
},
];
const FEED = [
{
who: "HA",
title: "Hamza merged PR #212 into vitrine-web",
meta: "Vitrine · Pull request",
time: "4m",
},
{
who: "CI",
title: "Deployment vitrine-api-a91e04d is live",
meta: "Vitrine · Deploy",
time: "6m",
},
{
who: "HA",
title: "Hamza commented on “Search architecture notes”",
meta: "Vitrine · Doc",
time: "38m",
},
{
who: "CI",
title: "Nightly backup completed (2.3 GB)",
meta: "Wayfinder · Job",
time: "2h",
},
{
who: "HA",
title: "Hamza closed WAY-41: room search index",
meta: "Wayfinder · Issue",
time: "3h",
},
];
function Spark({ data, tone }: { data: number[]; tone: string }) {
const max = Math.max(...data);
const pts = data
.map((v, i) => `${(i / (data.length - 1)) * 80},${22 - (v / max) * 18}`)
.join(" ");
return (
<svg width="80" height="24" viewBox="0 0 80 24" aria-hidden="true">
<polyline
points={pts}
fill="none"
stroke={tone}
strokeWidth="1.5"
strokeLinecap="round"
strokeLinejoin="round"
/>
</svg>
);
}
export default function Demo({ variant = "paper" }: { variant?: string }) {
const night = variant === "night";
const [mode, setMode] = useState<Mode>("cards");
const [speed, setSpeed] = useState<Speed>("slow");
const [run, setRun] = useState(1);
const { stage, failed, setFailed } = useTierSchedule(
SCHEDULES[speed],
speed === "fail" ? [3] : [],
run,
);
const c = night
? {
page: "bg-[#0f1012] text-[#ececea]",
card: "bg-[#16171a] ring-white/[0.08]",
muted: "text-[#8b8d93]",
line: "border-white/[0.07]",
seg: "ring-white/10",
on: "bg-white/10",
}
: {
page: "bg-[#f3f1ec] text-[#1b1a17]",
card: "bg-white ring-black/[0.08]",
muted: "text-[#77736b]",
line: "border-black/[0.07]",
seg: "ring-black/10",
on: "bg-black/[0.07]",
};
const replay = () => setRun((r) => r + 1);
const retry = (tier: Tier) => {
setFailed((f) => f.filter((t) => t !== tier));
};
const seg = <T extends string>(
label: string,
value: T,
set: (v: T) => void,
opts: [T, string][],
) => (
<div
className={`flex rounded-lg p-0.5 text-[12px] ring-1 ${c.seg}`}
role="group"
aria-label={label}
>
{opts.map(([v, l]) => (
<button
key={v}
type="button"
aria-pressed={value === v}
onClick={() => {
set(v);
replay();
}}
className={`h-7 rounded-md px-2.5 ${value === v ? c.on : "opacity-60"}`}
>
{l}
</button>
))}
</div>
);
const detailsFail = (
<span className={`text-[12px] ${c.muted}`}>
Activity unavailable ·{" "}
<button
type="button"
className="font-medium text-[#b4532a] underline-offset-2 hover:underline"
onClick={() => retry(3)}
>
Retry
</button>
</span>
);
return (
<div
className={`flex h-full min-h-[640px] w-full justify-center overflow-auto px-4 py-8 ${c.page}`}
style={{ fontFamily: "Geist, ui-sans-serif, system-ui" }}
>
<div className="w-full max-w-[880px]">
<div className="mb-5 flex flex-wrap items-center gap-2">
{seg("Layout", mode, setMode, [
["cards", "Cards"],
["list", "List"],
["article", "Article"],
])}
{seg("Speed", speed, setSpeed, [
["instant", "Instant"],
["fast", "Fast"],
["slow", "Slow"],
["fail", "Details fail"],
])}
<button
type="button"
onClick={replay}
className={`ml-auto h-8 rounded-lg px-3 text-[12.5px] ring-1 ${c.seg}`}
>
Replay
</button>
</div>
<RevealProvider
key={`${mode}-${run}`}
stage={stage}
failed={failed}
onRetry={retry}
theme={night ? "night" : "paper"}
label={
mode === "cards"
? "Projects"
: mode === "list"
? "Activity"
: "Article"
}
>
{mode === "cards" && (
<div className="grid gap-3 sm:grid-cols-3">
{PROJECTS.map((p, i) => (
<article
key={p.name}
className={`flex flex-col gap-3 rounded-2xl p-4 ring-1 ${c.card}`}
>
<div className="flex items-center gap-2.5">
<Reveal.Block tier={3} w={28} h={28} radius={8} order={i}>
<span
className="grid size-7 place-items-center rounded-lg text-[12px] font-semibold text-white"
style={{ background: p.tone }}
>
{p.mark}
</span>
</Reveal.Block>
<h3 className="m-0 min-w-0 flex-1 text-[15px] font-semibold">
<Reveal.Text tier={1} chars={10} order={i}>
{p.name}
</Reveal.Text>
</h3>
</div>
<p className="m-0 flex items-baseline gap-1.5">
<span className="text-[28px] font-semibold leading-none tracking-[-0.02em] tabular-nums">
<Reveal.Text tier={1} chars={2} order={i}>
{p.open}
</Reveal.Text>
</span>
<span className={`text-[13px] ${c.muted}`}>
<Reveal.Text tier={2} chars={11} order={i}>
{p.label}
</Reveal.Text>
</span>
</p>
<div className={`text-[13px] leading-[1.5] ${c.muted}`}>
<Reveal.Lines tier={2} lines={2} order={i}>
<p className="m-0">{p.desc}</p>
</Reveal.Lines>
</div>
<div
className={`mt-auto flex h-7 items-center justify-between gap-2 border-t pt-3 ${c.line}`}
>
<Reveal.Block
tier={3}
w={80}
h={24}
radius={4}
order={i}
fallback={detailsFail}
>
<Spark data={p.spark} tone={p.tone} />
</Reveal.Block>
<span className={`text-[12px] ${c.muted}`}>
<Reveal.Text tier={3} chars={8} order={i}>
{p.updated}
</Reveal.Text>
</span>
</div>
</article>
))}
</div>
)}
{mode === "list" && (
<ul
className={`m-0 list-none divide-y rounded-2xl p-0 ring-1 ${c.card} ${night ? "divide-white/[0.07]" : "divide-black/[0.07]"}`}
>
{FEED.map((f, i) => (
<li key={f.title} className="flex items-center gap-3 px-4 py-3">
<Reveal.Block
tier={3}
w={30}
h={30}
radius={99}
order={i}
fallback={
<span
className={`size-[30px] rounded-full ring-1 ${c.seg}`}
/>
}
>
<span
className={`grid size-[30px] place-items-center rounded-full text-[11px] font-semibold ${f.who === "HA" ? "bg-[#b4532a] text-white" : night ? "bg-white/10" : "bg-black/[0.07]"}`}
>
{f.who}
</span>
</Reveal.Block>
<div className="min-w-0 flex-1">
<p className="m-0 truncate text-[13.5px] font-medium">
<Reveal.Text
tier={1}
chars={Math.min(42, f.title.length)}
order={i}
>
{f.title}
</Reveal.Text>
</p>
<p className={`m-0 text-[12px] ${c.muted}`}>
<Reveal.Text tier={2} chars={f.meta.length} order={i}>
{f.meta}
</Reveal.Text>
</p>
</div>
<span
className={`shrink-0 text-[12px] tabular-nums ${c.muted}`}
>
<Reveal.Text tier={3} chars={3} order={i}>
{f.time}
</Reveal.Text>
</span>
</li>
))}
</ul>
)}
{mode === "article" && (
<article
className={`mx-auto max-w-[620px] rounded-2xl p-6 ring-1 sm:p-8 ${c.card}`}
>
<p className="m-0 text-[12px] font-medium uppercase tracking-[0.08em] text-[#b4532a]">
<Reveal.Text tier={2} chars={11}>
Engineering
</Reveal.Text>
</p>
<h2
className="mb-0 mt-2 text-[30px] font-normal leading-[1.12] tracking-[-0.015em]"
style={{ fontFamily: "'Instrument Serif', Georgia, serif" }}
>
<Reveal.Lines tier={1} lines={2}>
<span>
Moving Vitrine search to the edge, and what it cost us
</span>
</Reveal.Lines>
</h2>
<div
className={`mt-3 flex items-center gap-2 border-b pb-4 text-[12.5px] ${c.line} ${c.muted}`}
>
<Reveal.Block
tier={3}
w={22}
h={22}
radius={99}
fallback={null}
>
<span className="grid size-[22px] place-items-center rounded-full bg-[#b4532a] text-[9px] font-semibold text-white">
HA
</span>
</Reveal.Block>
<Reveal.Text tier={2} chars={16}>
Hamza Al-Bulushi
</Reveal.Text>
<span aria-hidden="true">·</span>
<Reveal.Text tier={3} chars={11}>
30 Sep 2026
</Reveal.Text>
</div>
<div className="mt-4 grid gap-3 text-[15px] leading-[1.65]">
<Reveal.Lines tier={2} lines={3} order={0}>
<p className="m-0">
Search in Vitrine used to run in one region. For anyone
outside the Gulf, every keystroke crossed an ocean before a
result came back.
</p>
</Reveal.Lines>
<Reveal.Lines tier={2} lines={3} order={1}>
<p className="m-0">
We moved the query path to the edge and kept the index where
it was. Median latency fell from 410 ms to 62 ms; the bill
rose by less than we feared.
</p>
</Reveal.Lines>
</div>
<div className="mt-5">
<Reveal.Block
tier={3}
w="100%"
h={140}
radius={12}
fallback={
<div
className={`grid h-[140px] place-items-center rounded-xl border border-dashed text-[12.5px] ${c.line} ${c.muted}`}
>
{detailsFail}
</div>
}
>
<figure className="m-0">
<div
className={`flex h-[140px] items-end gap-1.5 rounded-xl p-4 ${night ? "bg-white/[0.04]" : "bg-[#f6f5f1]"}`}
aria-label="Latency before and after"
role="img"
>
{[82, 76, 80, 71, 20, 14, 13, 12, 14, 12].map((h, i) => (
<span
key={i}
className="flex-1 rounded-sm"
style={{
height: `${h}%`,
background:
i < 4 ? (night ? "#555" : "#c9c4b8") : "#b4532a",
}}
/>
))}
</div>
<figcaption className={`mt-2 text-[12px] ${c.muted}`}>
p50 search latency, ms — before and after the move.
</figcaption>
</figure>
</Reveal.Block>
</div>
</article>
)}
</RevealProvider>
<p className={`mt-4 text-[12px] ${c.muted}`} aria-hidden="true">
Stage {Math.min(stage, 3)} of 3 ·{" "}
{stage >= 4
? "complete"
: ["structure", "primary", "secondary", "details"][stage]}
</p>
</div>
</div>
);
}