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feat(miku-web): add branded boot screen with loading progress and error states #2

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Merged
zhubby merged 1 commit into from
Jun 23, 2026
Merged

feat(miku-web): add branded boot screen with loading progress and error states #2

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306 changes: 303 additions & 3 deletions crates/miku-web/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,20 @@
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Miku</title>
<style>
:root {
color-scheme: dark;
--miku-bg: #0f1115;
--miku-panel-border: #2b313a;
--miku-text: #edf2f7;
--miku-muted: #9aa7b5;
--miku-faint: #66717f;
--miku-accent: #55d08a;
--miku-accent-strong: #90f0b8;
--miku-warn: #f4bd50;
--miku-error: #ff6b6b;
--miku-grid: rgba(255, 255, 255, 0.045);
}

html,
body,
canvas {
Expand All @@ -15,20 +29,306 @@

body {
overflow: hidden;
background: #0f1115;
background:
linear-gradient(var(--miku-grid) 1px, transparent 1px),
linear-gradient(90deg, var(--miku-grid) 1px, transparent 1px),
var(--miku-bg);
background-size:
42px 42px,
42px 42px,
auto;
color: var(--miku-text);
font-family:
ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
sans-serif;
}

canvas {
display: block;
opacity: 0;
transition: opacity 220ms ease;
}

#miku-loading {
position: fixed;
inset: 0;
z-index: 10;
display: grid;
place-items: center;
padding: 28px;
box-sizing: border-box;
background:
linear-gradient(180deg, rgba(15, 17, 21, 0.88), rgba(15, 17, 21, 0.98)),
var(--miku-bg);
transition:
opacity 260ms ease,
visibility 260ms ease;
}

.boot-panel {
width: min(440px, 100%);
box-sizing: border-box;
padding: 28px;
border: 1px solid var(--miku-panel-border);
border-radius: 8px;
background: rgba(23, 26, 32, 0.92);
box-shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
}

.brand-row {
display: flex;
align-items: center;
gap: 14px;
margin-bottom: 28px;
}

.brand-mark {
position: relative;
width: 48px;
height: 48px;
flex: 0 0 auto;
border: 1px solid rgba(85, 208, 138, 0.5);
border-radius: 8px;
background: #11161a;
}

.brand-mark::before,
.brand-mark::after {
position: absolute;
content: "";
background: var(--miku-accent);
}

.brand-mark::before {
inset: 12px 14px;
border-radius: 999px;
box-shadow:
-9px 7px 0 -3px var(--miku-accent-strong),
9px 7px 0 -3px var(--miku-accent-strong);
}

.brand-mark::after {
left: 15px;
right: 15px;
bottom: 9px;
height: 3px;
border-radius: 999px;
background: var(--miku-warn);
}

.eyebrow {
margin: 0 0 3px;
color: var(--miku-muted);
font-size: 12px;
letter-spacing: 0;
text-transform: uppercase;
}

h1 {
margin: 0;
color: var(--miku-text);
font-size: 32px;
font-weight: 700;
line-height: 1.05;
letter-spacing: 0;
}

.loading-message {
min-height: 28px;
margin: 0 0 18px;
color: var(--miku-text);
font-size: 18px;
line-height: 1.55;
}

.progress {
height: 3px;
overflow: hidden;
border-radius: 999px;
background: #29303a;
}

.progress span {
display: block;
width: 46%;
height: 100%;
border-radius: inherit;
background: var(--miku-accent);
animation: miku-progress 1.35s cubic-bezier(0.65, 0, 0.35, 1) infinite;
}

.boot-steps {
display: grid;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 12px;
margin: 22px 0 0;
padding: 0;
color: var(--miku-muted);
font-size: 13px;
list-style: none;
}

.boot-steps li {
display: flex;
min-width: 0;
align-items: center;
gap: 8px;
white-space: nowrap;
}

.boot-steps span {
width: 8px;
height: 8px;
flex: 0 0 auto;
border-radius: 999px;
background: var(--miku-accent);
animation: miku-pulse 1.4s ease-in-out infinite;
}

.boot-steps li:nth-child(2) span {
animation-delay: 180ms;
}

.boot-steps li:nth-child(3) span {
animation-delay: 360ms;
}

.loading-detail {
min-height: 20px;
margin: 18px 0 0;
color: var(--miku-faint);
font-size: 13px;
line-height: 1.55;
}

.miku-ready canvas {
opacity: 1;
}

.miku-ready #miku-loading {
visibility: hidden;
opacity: 0;
pointer-events: none;
}

.miku-boot-error #miku-loading {
background: var(--miku-bg);
}

.miku-boot-error .brand-mark,
.miku-boot-error .progress span,
.miku-boot-error .boot-steps span {
border-color: rgba(255, 107, 107, 0.5);
background: var(--miku-error);
animation: none;
}

.miku-boot-error .loading-message,
.miku-boot-error .loading-detail {
color: var(--miku-error);
}

@media (max-width: 520px) {
#miku-loading {
padding: 18px;
}

.boot-panel {
padding: 22px;
}

.boot-steps {
grid-template-columns: 1fr;
}
}

@media (prefers-reduced-motion: reduce) {
*,
*::before,
*::after {
animation-duration: 1ms !important;
animation-iteration-count: 1 !important;
scroll-behavior: auto !important;
transition-duration: 1ms !important;
}
}

@keyframes miku-progress {
0% {
transform: translateX(-105%);
}
100% {
transform: translateX(235%);
}
}

@keyframes miku-pulse {
0%,
100% {
opacity: 0.45;
transform: scale(0.82);
}
45% {
opacity: 1;
transform: scale(1);
}
}
</style>
<script type="module">
import init from "./miku_web.js";
const root = document.documentElement;
const loadingMessage = document.getElementById("miku-loading-message");
const loadingDetail = document.getElementById("miku-loading-detail");
const formatError = (error) => {
if (error instanceof Error && error.message) {
return error.message;
}
if (typeof error === "string") {
return error;
}
return String(error);
};

await init();
try {
root.dataset.mikuBoot = "wasm-loading";
const { default: init } = await import("./miku_web.js");
await init();
root.dataset.mikuBoot = "app-starting";
if (loadingDetail) {
loadingDetail.textContent = "Starting Miku workspace";
}
} catch (error) {
console.error("failed to load Miku web runtime", error);
root.classList.add("miku-boot-error");
root.dataset.mikuBoot = "failed";
if (loadingMessage) {
loadingMessage.textContent = "Miku could not start";
}
if (loadingDetail) {
loadingDetail.textContent = formatError(error);
}
}
</script>
</head>
<body>
<main id="miku-loading" aria-live="polite" aria-busy="true">
<section class="boot-panel" aria-labelledby="miku-loading-title">
<div class="brand-row">
<div class="brand-mark" aria-hidden="true"></div>
<div>
<p class="eyebrow">Miku Web</p>
<h1 id="miku-loading-title">Miku</h1>
</div>
</div>
<p id="miku-loading-message" class="loading-message">Preparing workspace</p>
<div class="progress" aria-hidden="true"><span></span></div>
<ul class="boot-steps" aria-label="Startup progress">
<li><span aria-hidden="true"></span>Web shell</li>
<li><span aria-hidden="true"></span>Runtime</li>
<li><span aria-hidden="true"></span>Services</li>
</ul>
<p id="miku-loading-detail" class="loading-detail">Loading WebAssembly runtime</p>
</section>
</main>
<canvas id="miku-canvas"></canvas>
</body>
</html>
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