Ditch old css. Use Material UI. Add Modal. Make it work on mobile.

src/App.tsx

@@ -1,5 +1,14 @@
 import { z } from "zod"
 import { useReducer, useRef, useEffect, createContext, useContext } from "react"
+import {
+  CssBaseline,
+  Box,
+  Button,
+  Typography,
+  Skeleton,
+  Dialog,
+  DialogContent,
+} from "@mui/material"
 
 // TODO: Use Material UI later.
 // TODO: Improve error-handling. Introduce some proper server response.
@@ -26,8 +35,8 @@ type Dimension = {
   height: number
 }
 const Dimension = {
-  medium: { width: 200, height: 200 } as Dimension,
+  medium: { width: 180, height: 180 } as Dimension,
-  big: { width: 300, height: 500 } as Dimension,
+  big: { width: 720, height: 720 } as Dimension,
 }
 
 // === Page ===
@@ -62,6 +71,9 @@ const Page = {
   key(page: Page): PageKey {
     return `${page.page}:${page.limit}`
   },
+  isFirst(page: Page): boolean {
+    return page.page === FIRST_PAGE
+  },
 }
 
 // === api ===
@@ -230,7 +242,7 @@ function useDispatch() {
 function RemoteImages({ images }: { images: Remote<ImageId[], AppError> }) {
   switch (images.tag) {
     case "loading":
-      return <div>Loading...</div>
+      return <ImagesSkeleton />
     case "error":
       return <div>Error: TODO</div>
     case "loaded":
@@ -238,21 +250,82 @@ function RemoteImages({ images }: { images: Remote<ImageId[], AppError> }) {
   }
 }
 
+function imageGridStyle(dimension: Dimension) {
+  return {
+    display: "grid",
+    gridTemplateColumns: {
+      xs: `repeat(2, ${dimension.width}px)`,
+      md: `repeat(5, ${dimension.width}px)`,
+    },
+    gridAutoRows: `${dimension.height}px`,
+    gap: 2,
+  }
+}
+
+// 2x5 on mobile, 5x2 on desktop (assuming 10 images per page)
+function ImagesSkeleton() {
+  const images = Array.from({ length: 10 })
+  return (
+    <Box sx={imageGridStyle(Dimension.medium)}>
+      {images.map((_, index) => (
+        <Skeleton
+          key={index}
+          variant="rectangular"
+          width={Dimension.medium.width}
+          height={Dimension.medium.height}
+        ></Skeleton>
+      ))}
+    </Box>
+  )
+}
+
 function Images({ images }: { images: ImageId[] }) {
   const dispatch = useDispatch()
-  // TODO: Is there some basic `Col/Row` component?
   return (
-    <div style={{ display: "flex", flexDirection: "column" }}>
+    <Box sx={imageGridStyle(Dimension.medium)}>
       {images.map((imageId) => (
-        <img
+        <Box
-          style={{ width: Dimension.medium.width, height: Dimension.medium.height }}
+          component="img"
-          key={imageId}
           src={getImageSource(imageId, Dimension.medium)}
           onClick={() => dispatch({ tag: "imageClicked", imageId })}
+          sx={{
+            width: Dimension.medium.width,
+            height: Dimension.medium.height,
+            objectFit: "cover",
+            cursor: "pointer",
+          }}
+          key={imageId}
           alt=""
         />
       ))}
-    </div>
+    </Box>
+  )
+}
+
+function ImageModal({ selectedImage }: { selectedImage: ImageId | undefined }) {
+  const dispatch = useDispatch()
+  return (
+    <Dialog
+      open={selectedImage !== undefined}
+      onClose={() => dispatch({ tag: "modalCloseButtonClicked" })}
+      maxWidth={false}
+    >
+      <DialogContent sx={{ p: 0, overflow: "hidden" }}>
+        {selectedImage !== undefined && (
+          <Box
+            component="img"
+            src={getImageSource(selectedImage, Dimension.big)}
+            sx={{
+              display: "block",
+              maxWidth: "90vw",
+              maxHeight: "80vh",
+              objectFit: "contain",
+            }}
+            alt=""
+          />
+        )}
+      </DialogContent>
+    </Dialog>
   )
 }
 
@@ -260,13 +333,53 @@ export default function App() {
   const [state, dispatch] = useApp()
 
   return (
+    <>
+      <CssBaseline />
       <DispatchContext.Provider value={dispatch}>
-      <main>
+        <Box
-        <h1>Picturarium</h1>
+          component="main"
+          sx={{
+            minHeight: "100vh",
+            display: "flex",
+            flexDirection: "column",
+            alignItems: "center",
+          }}
+        >
+          <Typography variant="h2">Picturarium</Typography>
+
           <RemoteImages images={state.imageIds} />
-        <button onClick={() => dispatch({ tag: "previousButtonClicked" })}>prev</button>
+
-        <button onClick={() => dispatch({ tag: "nextButtonClicked" })}>next</button>
+          <Box
-      </main>
+            sx={{
+              display: "flex",
+              flexDirection: "row",
+              gap: 2,
+              justifyContent: "center",
+              alignItems: "center",
+            }}
+          >
+            <Button
+              onClick={() => dispatch({ tag: "previousButtonClicked" })}
+              disabled={Page.isFirst(state.page)}
+            >
+              prev
+            </Button>
+            <Typography
+              variant="body1"
+              sx={{
+                minWidth: 60,
+                textAlign: "center",
+                color: "oklch(65% 0.02 260)",
+              }}
+            >
+              {state.page.page}
+            </Typography>
+            <Button onClick={() => dispatch({ tag: "nextButtonClicked" })}>next</Button>
+          </Box>
+        </Box>
+
+        <ImageModal selectedImage={state.selectedImage} />
       </DispatchContext.Provider>
+    </>
   )
 }

src/index.css

@@ -1,41 +0,0 @@
-/* === Reset === */
-*,
-*::before,
-*::after {
-  box-sizing: border-box;
-}
-
-html {
-  line-height: 1.45;
-}
-
-body {
-  margin: 0;
-}
-
-h1,
-h2,
-h3,
-h4,
-h5,
-h6 {
-  margin: 0;
-}
-
-p {
-  margin: 0;
-}
-
-ul {
-  list-style: none;
-  padding: 0;
-  margin: 0;
-}
-
-button {
-  border: none;
-  padding: 0;
-  cursor: pointer;
-}
-
-/* === main === */

src/main.tsx

@@ -1,7 +1,7 @@
 import { StrictMode } from "react"
 import { createRoot } from "react-dom/client"
 import App from "./App"
-import "./index.css"
+import "./style.css"
 
 const rootElement = document.getElementById("root")
 

src/style.css

@@ -0,0 +1,3 @@
+:root {
+  --base-hue: 260;
+}