9 files changed, 324 insertions, 0 deletions
diff --git a/src/cartStore.ts b/src/cartStore.ts
new file mode 100644
index 000000000..a57a6ce87
--- /dev/null
+++ b/src/cartStore.ts
@@ -0,0 +1,31 @@
+import { atom, map } from 'nanostores';
+
+export const isCartOpen = atom(false);
+
+export type CartItem = {
+	id: string;
+	name: string;
+	imageSrc: string;
+	quantity: number;
+};
+
+export type CartItemDisplayInfo = Pick<CartItem, 'id' | 'name' | 'imageSrc'>;
+
+export const cartItems = map<Record<string, CartItem>>({});
+
+export function addCartItem({ id, name, imageSrc }: CartItemDisplayInfo) {
+	const existingEntry = cartItems.get()[id];
+	if (existingEntry) {
+		cartItems.setKey(id, {
+			...existingEntry,
+			quantity: existingEntry.quantity + 1,
+		});
+	} else {
+		cartItems.setKey(id, {
+			id,
+			name,
+			imageSrc,
+			quantity: 1,
+		});
+	}
+}
diff --git a/src/components/AddToCartForm.tsx b/src/components/AddToCartForm.tsx
new file mode 100644
index 000000000..7498443f6
--- /dev/null
+++ b/src/components/AddToCartForm.tsx
@@ -0,0 +1,18 @@
+import { isCartOpen, addCartItem } from '../cartStore';
+import type { CartItemDisplayInfo } from '../cartStore';
+import type { ComponentChildren } from 'preact';
+
+type Props = {
+	item: CartItemDisplayInfo;
+	children: ComponentChildren;
+};
+
+export default function AddToCartForm({ item, children }: Props) {
+	function addToCart(e: SubmitEvent) {
+		e.preventDefault();
+		isCartOpen.set(true);
+		addCartItem(item);
+	}
+
+	return <form onSubmit={addToCart}>{children}</form>;
+}
diff --git a/src/components/CartFlyout.module.css b/src/components/CartFlyout.module.css
new file mode 100644
index 000000000..cee43dd4c
--- /dev/null
+++ b/src/components/CartFlyout.module.css
@@ -0,0 +1,29 @@
+.container {
+	position: fixed;
+	right: 0;
+	top: var(--nav-height);
+	height: 100vh;
+	background: var(--color-bg-2);
+	padding-inline: 2rem;
+	min-width: min(90vw, 300px);
+	border-left: 3px solid var(--color-bg-3);
+}
+
+.list {
+	list-style: none;
+	padding: 0;
+}
+
+.listItem {
+	display: flex;
+	gap: 1rem;
+	align-items: center;
+}
+
+.listItem * {
+	margin-block: 0.3rem;
+}
+
+.listItemImg {
+	width: 4rem;
+}
diff --git a/src/components/CartFlyout.tsx b/src/components/CartFlyout.tsx
new file mode 100644
index 000000000..98fd8cbfb
--- /dev/null
+++ b/src/components/CartFlyout.tsx
@@ -0,0 +1,28 @@
+import { useStore } from '@nanostores/preact';
+import { cartItems, isCartOpen } from '../cartStore';
+import styles from './CartFlyout.module.css';
+
+export default function CartFlyout() {
+	const $isCartOpen = useStore(isCartOpen);
+	const $cartItems = useStore(cartItems);
+
+	return (
+		<aside hidden={!$isCartOpen} className={styles.container}>
+			{Object.values($cartItems).length ? (
+				<ul className={styles.list} role="list">
+					{Object.values($cartItems).map((cartItem) => (
+						<li className={styles.listItem}>
+							<img className={styles.listItemImg} src={cartItem.imageSrc} alt={cartItem.name} />
+							<div>
+								<h3>{cartItem.name}</h3>
+								<p>Quantity: {cartItem.quantity}</p>
+							</div>
+						</li>
+					))}
+				</ul>
+			) : (
+				<p>Your cart is empty!</p>
+			)}
+		</aside>
+	);
+}
diff --git a/src/components/CartFlyoutToggle.tsx b/src/components/CartFlyoutToggle.tsx
new file mode 100644
index 000000000..14ce1c70d
--- /dev/null
+++ b/src/components/CartFlyoutToggle.tsx
@@ -0,0 +1,7 @@
+import { useStore } from '@nanostores/preact';
+import { isCartOpen } from '../cartStore';
+
+export default function CartFlyoutToggle() {
+	const $isCartOpen = useStore(isCartOpen);
+	return <button onClick={() => isCartOpen.set(!$isCartOpen)}>Cart</button>;
+}
diff --git a/src/components/FigurineDescription.astro b/src/components/FigurineDescription.astro
new file mode 100644
index 000000000..1294b1510
--- /dev/null
+++ b/src/components/FigurineDescription.astro
@@ -0,0 +1,44 @@
+<h1>Astronaut Figurine</h1>
+<p class="limited-edition-badge">Limited Edition</p>
+<p>
+	The limited edition Astronaut Figurine is the perfect gift for any Astro contributor. This
+	fully-poseable action figurine comes equipped with:
+</p>
+<ul>
+	<li>A fabric space suit with adjustable straps</li>
+	<li>Boots lightly dusted by the lunar surface *</li>
+	<li>An adjustable space visor</li>
+</ul>
+<p>
+	<sub>* Dust not actually from the lunar surface</sub>
+</p>
+
+<style>
+	h1 {
+		margin: 0;
+		margin-block-start: 2rem;
+	}
+
+	.limited-edition-badge {
+		font-weight: 700;
+		text-transform: uppercase;
+		background-image: linear-gradient(0deg, var(--astro-blue), var(--astro-pink));
+		background-size: 100% 200%;
+		background-position-y: 100%;
+		border-radius: 0.4rem;
+		animation: pulse 4s ease-in-out infinite;
+		display: inline-block;
+		color: white;
+		padding: 0.2rem 0.4rem;
+	}
+
+	@keyframes pulse {
+		0%,
+		100% {
+			background-position-y: 0%;
+		}
+		50% {
+			background-position-y: 80%;
+		}
+	}
+</style>
diff --git a/src/layouts/Layout.astro b/src/layouts/Layout.astro
new file mode 100644
index 000000000..aa8c34773
--- /dev/null
+++ b/src/layouts/Layout.astro
@@ -0,0 +1,113 @@
+---
+import CartFlyout from '../components/CartFlyout';
+import CartFlyoutToggle from '../components/CartFlyoutToggle';
+import { withBase } from '../utils';
+
+interface Props {
+	title: string;
+}
+
+const { title } = Astro.props;
+---
+
+<!doctype html>
+<html lang="en">
+	<head>
+		<meta charset="UTF-8" />
+		<meta name="viewport" content="width=device-width" />
+		<meta name="generator" content={Astro.generator} />
+		<link rel="icon" type="image/svg+xml" href={withBase('/favicon.svg')} />
+		<title>{title}</title>
+	</head>
+	<body>
+		<header>
+			<nav>
+				<a href={withBase('/')} class="nav-header">
+					<span style="color: var(--astro-blue)">Astro</span> storefront
+				</a>
+				<CartFlyoutToggle client:load />
+			</nav>
+		</header>
+		<slot />
+		<CartFlyout client:load />
+	</body>
+</html>
+
+<style is:global>
+	:root {
+		--font-family: system-ui, sans-serif;
+		--font-size-base: clamp(1rem, 0.34vw + 0.91rem, 1.19rem);
+		--font-size-lg: clamp(1.2rem, 0.7vw + 1.2rem, 1.5rem);
+		--font-size-xl: clamp(2rem, 1.75vw + 1.35rem, 2.75rem);
+
+		--color-text: hsl(12, 5%, 4%);
+		--color-bg: hsl(17, 20%, 97%);
+		--color-bg-2: hsl(17, 20%, 94%);
+		--color-bg-3: hsl(17, 20%, 88%);
+		--astro-blue: #4f39fa;
+		--astro-pink: #da62c4;
+
+		--content-max-width: 90ch;
+		--nav-height: clamp(2.44rem, 2.38vw + 1.85rem, 3.75rem);
+	}
+
+	h1 {
+		font-size: var(--font-size-xl);
+	}
+
+	button {
+		border: none;
+		color: var(--astro-blue);
+		border: 2px solid var(--astro-blue);
+		transition:
+			color 0.2s,
+			background-color 0.2s;
+		background-color: transparent;
+		padding: 0.4rem 0.8rem;
+		border-radius: 0.4rem;
+		font-family: var(--font-family);
+		font-size: var(--font-size-base);
+		font-weight: bold;
+		cursor: pointer;
+	}
+
+	button:hover {
+		background-color: var(--astro-blue);
+		color: white;
+	}
+</style>
+
+<style>
+	html {
+		font-family: var(--font-family);
+		font-size: var(--font-size-base);
+		color: var(--color-text);
+		background-color: var(--color-bg);
+	}
+
+	body {
+		margin: 0;
+	}
+
+	header {
+		background: var(--color-bg-2);
+	}
+
+	nav {
+		max-width: var(--content-max-width);
+		height: var(--nav-height);
+		margin: auto;
+		padding-inline: 1rem;
+		display: flex;
+		justify-content: space-between;
+		align-items: center;
+	}
+
+	.nav-header,
+	.nav-header:visited {
+		font-size: var(--font-size-base);
+		font-weight: bold;
+		color: inherit;
+		text-decoration: none;
+	}
+</style>
diff --git a/src/pages/index.astro b/src/pages/index.astro
new file mode 100644
index 000000000..c90609595
--- /dev/null
+++ b/src/pages/index.astro
@@ -0,0 +1,50 @@
+---
+import type { CartItemDisplayInfo } from '../cartStore';
+import Layout from '../layouts/Layout.astro';
+import AddToCartForm from '../components/AddToCartForm';
+import FigurineDescription from '../components/FigurineDescription.astro';
+import { withBase } from '../utils';
+
+const item: CartItemDisplayInfo = {
+	id: 'astronaut-figurine',
+	name: 'Astronaut Figurine',
+	imageSrc: withBase('/images/astronaut-figurine.png'),
+};
+---
+
+<Layout title={item.name}>
+	<main>
+		<div class="product-layout">
+			<div>
+				<FigurineDescription />
+				<AddToCartForm item={item} client:load>
+					<button type="submit">Add to cart</button>
+				</AddToCartForm>
+			</div>
+			<img src={item.imageSrc} alt={item.name} />
+		</div>
+	</main>
+</Layout>
+
+<style>
+	main {
+		margin: auto;
+		padding: 1em;
+		max-width: var(--content-max-width);
+	}
+
+	.product-layout {
+		display: grid;
+		gap: 2rem;
+		grid-template-columns: repeat(auto-fit, minmax(20rem, max-content));
+	}
+
+	.product-layout img {
+		width: 100%;
+		max-width: 26rem;
+	}
+
+	button[type='submit'] {
+		margin-block-start: 1rem;
+	}
+</style>
diff --git a/src/utils.ts b/src/utils.ts
new file mode 100644
index 000000000..cbe38f5f3
--- /dev/null
+++ b/src/utils.ts
@@ -0,0 +1,4 @@
+const base = import.meta.env.BASE_URL.replace(/\/$/, '');
+
+/** Prefix a URL path with the site’s base path if set. */
+export const withBase = (path: string) => base + path;