Initial commit

.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/hackathon.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.tmp" />
+      <excludeFolder url="file://$MODULE_DIR$/temp" />
+      <excludeFolder url="file://$MODULE_DIR$/tmp" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file

.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/hackathon.iml" filepath="$PROJECT_DIR$/.idea/hackathon.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

frontend/.gitignore

+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
+
+public/tiles/*

frontend/README.md

+# React + TypeScript + Vite
+
+This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+
+Currently, two official plugins are available:
+
+- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Babel](https://babeljs.io/) (or [oxc](https://oxc.rs) when used in [rolldown-vite](https://vite.dev/guide/rolldown)) for Fast Refresh
+- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
+
+## React Compiler
+
+The React Compiler is not enabled on this template because of its impact on dev & build performances. To add it, see [this documentation](https://react.dev/learn/react-compiler/installation).
+
+## Expanding the ESLint configuration
+
+If you are developing a production application, we recommend updating the configuration to enable type-aware lint rules:
+
+```js
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      // Other configs...
+
+      // Remove tseslint.configs.recommended and replace with this
+      tseslint.configs.recommendedTypeChecked,
+      // Alternatively, use this for stricter rules
+      tseslint.configs.strictTypeChecked,
+      // Optionally, add this for stylistic rules
+      tseslint.configs.stylisticTypeChecked,
+
+      // Other configs...
+    ],
+    languageOptions: {
+      parserOptions: {
+        project: ['./tsconfig.node.json', './tsconfig.app.json'],
+        tsconfigRootDir: import.meta.dirname,
+      },
+      // other options...
+    },
+  },
+])
+```
+
+You can also install [eslint-plugin-react-x](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-x) and [eslint-plugin-react-dom](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-dom) for React-specific lint rules:
+
+```js
+// eslint.config.js
+import reactX from 'eslint-plugin-react-x'
+import reactDom from 'eslint-plugin-react-dom'
+
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      // Other configs...
+      // Enable lint rules for React
+      reactX.configs['recommended-typescript'],
+      // Enable lint rules for React DOM
+      reactDom.configs.recommended,
+    ],
+    languageOptions: {
+      parserOptions: {
+        project: ['./tsconfig.node.json', './tsconfig.app.json'],
+        tsconfigRootDir: import.meta.dirname,
+      },
+      // other options...
+    },
+  },
+])
+```

frontend/components.json

+{
+  "$schema": "https://ui.shadcn.com/schema.json",
+  "style": "new-york",
+  "rsc": false,
+  "tsx": true,
+  "tailwind": {
+    "config": "",
+    "css": "src/index.css",
+    "baseColor": "zinc",
+    "cssVariables": true,
+    "prefix": ""
+  },
+  "iconLibrary": "lucide",
+  "aliases": {
+    "components": "@/components",
+    "utils": "@/lib/utils",
+    "ui": "@/components/ui",
+    "lib": "@/lib",
+    "hooks": "@/hooks"
+  },
+  "registries": {}
+}

frontend/eslint.config.js

+import js from '@eslint/js'
+import globals from 'globals'
+import reactHooks from 'eslint-plugin-react-hooks'
+import reactRefresh from 'eslint-plugin-react-refresh'
+import tseslint from 'typescript-eslint'
+import { defineConfig, globalIgnores } from 'eslint/config'
+
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      js.configs.recommended,
+      tseslint.configs.recommended,
+      reactHooks.configs['recommended-latest'],
+      reactRefresh.configs.vite,
+    ],
+    languageOptions: {
+      ecmaVersion: 2020,
+      globals: globals.browser,
+    },
+  },
+])

frontend/index.html

+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>frontend</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>

frontend/package.json

+{
+  "name": "frontend",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "lint": "eslint .",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@napi-rs/canvas": "^0.1.80",
+    "@radix-ui/react-label": "^2.1.7",
+    "@radix-ui/react-radio-group": "^1.3.8",
+    "@radix-ui/react-slider": "^1.3.6",
+    "@radix-ui/react-slot": "^1.2.3",
+    "@tailwindcss/vite": "^4.1.14",
+    "@tanstack/react-router": "^1.132.47",
+    "canvas": "^3.2.0",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "lucide-react": "^0.545.0",
+    "maplibre-gl": "^5.9.0",
+    "react": "^19.1.1",
+    "react-dom": "^19.1.1",
+    "react-map-gl": "^8.1.0",
+    "tailwind-merge": "^3.3.1",
+    "tailwindcss": "^4.1.14"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.36.0",
+    "@types/node": "^24.6.0",
+    "@types/react": "^19.1.16",
+    "@types/react-dom": "^19.1.9",
+    "@vitejs/plugin-react": "^5.0.4",
+    "eslint": "^9.36.0",
+    "eslint-plugin-react-hooks": "^5.2.0",
+    "eslint-plugin-react-refresh": "^0.4.22",
+    "globals": "^16.4.0",
+    "tw-animate-css": "^1.4.0",
+    "typescript": "~5.9.3",
+    "typescript-eslint": "^8.45.0",
+    "vite": "^7.1.7"
+  }
+}

frontend/public/vite.svg

+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFEA83"></stop><stop offset="8.333%" stop-color="#FFDD35"></stop><stop offset="100%" stop-color="#FFA800"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>
\ No newline at end of file

frontend/src/App.tsx

+import './App.css'
+import {MapViewer} from "@/components/map/map-viewer.tsx";
+import {Slider} from "@/components/ui/slider.tsx";
+import {MapLayerCard} from "@/components/map/map-layer-card.tsx";
+import {useState} from "react";
+import TimelineSlider from "@/components/timeline/timeline-slider.tsx";
+
+function App() {
+  const MIN_YEAR = 2020;
+  const MAX_YEAR = 2025;
+  const INITIAL_YEAR = 2022;
+  const [year, setYear] = useState<number>(INITIAL_YEAR);
+
+  return (
+    <div className="h-screen w-screen overflow-hidden flex flex-col">
+      <div className="relative flex-1 min-h-0 min-w-0 overflow-hidden">
+        <div className="absolute inset-0">
+          <MapViewer year={year}/>
+        </div>
+        <div className="absolute right-4 top-4 z-10 w-1/6">
+          <MapLayerCard/>
+        </div>
+      </div>
+
+      <div
+        className="
+      absolute left-1/2 bottom-5 -translate-x-1/2 z-30
+      pointer-events-none
+      pb-[env(safe-area-inset-bottom)]
+      w-full
+    "
+      >
+        <div
+          className="
+        pointer-events-auto mx-auto
+        max-w-[min(1000px,92vw)]
+      "
+        >
+          <TimelineSlider
+            min={MIN_YEAR}
+            max={MAX_YEAR}
+            value={year}
+            onChange={setYear}
+            step={1}
+            loop
+            label={(v) => `${v}`}
+          />
+        </div>
+      </div>
+    </div>
+  )
+}
+
+export default App

frontend/src/assets/react.svg

+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="35.93" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 228"><path fill="#00D8FF" d="M210.483 73.824a171.49 171.49 0 0 0-8.24-2.597c.465-1.9.893-3.777 1.273-5.621c6.238-30.281 2.16-54.676-11.769-62.708c-13.355-7.7-35.196.329-57.254 19.526a171.23 171.23 0 0 0-6.375 5.848a155.866 155.866 0 0 0-4.241-3.917C100.759 3.829 77.587-4.822 63.673 3.233C50.33 10.957 46.379 33.89 51.995 62.588a170.974 170.974 0 0 0 1.892 8.48c-3.28.932-6.445 1.924-9.474 2.98C17.309 83.498 0 98.307 0 113.668c0 15.865 18.582 31.778 46.812 41.427a145.52 145.52 0 0 0 6.921 2.165a167.467 167.467 0 0 0-2.01 9.138c-5.354 28.2-1.173 50.591 12.134 58.266c13.744 7.926 36.812-.22 59.273-19.855a145.567 145.567 0 0 0 5.342-4.923a168.064 168.064 0 0 0 6.92 6.314c21.758 18.722 43.246 26.282 56.54 18.586c13.731-7.949 18.194-32.003 12.4-61.268a145.016 145.016 0 0 0-1.535-6.842c1.62-.48 3.21-.974 4.76-1.488c29.348-9.723 48.443-25.443 48.443-41.52c0-15.417-17.868-30.326-45.517-39.844Zm-6.365 70.984c-1.4.463-2.836.91-4.3 1.345c-3.24-10.257-7.612-21.163-12.963-32.432c5.106-11 9.31-21.767 12.459-31.957c2.619.758 5.16 1.557 7.61 2.4c23.69 8.156 38.14 20.213 38.14 29.504c0 9.896-15.606 22.743-40.946 31.14Zm-10.514 20.834c2.562 12.94 2.927 24.64 1.23 33.787c-1.524 8.219-4.59 13.698-8.382 15.893c-8.067 4.67-25.32-1.4-43.927-17.412a156.726 156.726 0 0 1-6.437-5.87c7.214-7.889 14.423-17.06 21.459-27.246c12.376-1.098 24.068-2.894 34.671-5.345a134.17 134.17 0 0 1 1.386 6.193ZM87.276 214.515c-7.882 2.783-14.16 2.863-17.955.675c-8.075-4.657-11.432-22.636-6.853-46.752a156.923 156.923 0 0 1 1.869-8.499c10.486 2.32 22.093 3.988 34.498 4.994c7.084 9.967 14.501 19.128 21.976 27.15a134.668 134.668 0 0 1-4.877 4.492c-9.933 8.682-19.886 14.842-28.658 17.94ZM50.35 144.747c-12.483-4.267-22.792-9.812-29.858-15.863c-6.35-5.437-9.555-10.836-9.555-15.216c0-9.322 13.897-21.212 37.076-29.293c2.813-.98 5.757-1.905 8.812-2.773c3.204 10.42 7.406 21.315 12.477 32.332c-5.137 11.18-9.399 22.249-12.634 32.792a134.718 134.718 0 0 1-6.318-1.979Zm12.378-84.26c-4.811-24.587-1.616-43.134 6.425-47.789c8.564-4.958 27.502 2.111 47.463 19.835a144.318 144.318 0 0 1 3.841 3.545c-7.438 7.987-14.787 17.08-21.808 26.988c-12.04 1.116-23.565 2.908-34.161 5.309a160.342 160.342 0 0 1-1.76-7.887Zm110.427 27.268a347.8 347.8 0 0 0-7.785-12.803c8.168 1.033 15.994 2.404 23.343 4.08c-2.206 7.072-4.956 14.465-8.193 22.045a381.151 381.151 0 0 0-7.365-13.322Zm-45.032-43.861c5.044 5.465 10.096 11.566 15.065 18.186a322.04 322.04 0 0 0-30.257-.006c4.974-6.559 10.069-12.652 15.192-18.18ZM82.802 87.83a323.167 323.167 0 0 0-7.227 13.238c-3.184-7.553-5.909-14.98-8.134-22.152c7.304-1.634 15.093-2.97 23.209-3.984a321.524 321.524 0 0 0-7.848 12.897Zm8.081 65.352c-8.385-.936-16.291-2.203-23.593-3.793c2.26-7.3 5.045-14.885 8.298-22.6a321.187 321.187 0 0 0 7.257 13.246c2.594 4.48 5.28 8.868 8.038 13.147Zm37.542 31.03c-5.184-5.592-10.354-11.779-15.403-18.433c4.902.192 9.899.29 14.978.29c5.218 0 10.376-.117 15.453-.343c-4.985 6.774-10.018 12.97-15.028 18.486Zm52.198-57.817c3.422 7.8 6.306 15.345 8.596 22.52c-7.422 1.694-15.436 3.058-23.88 4.071a382.417 382.417 0 0 0 7.859-13.026a347.403 347.403 0 0 0 7.425-13.565Zm-16.898 8.101a358.557 358.557 0 0 1-12.281 19.815a329.4 329.4 0 0 1-23.444.823c-7.967 0-15.716-.248-23.178-.732a310.202 310.202 0 0 1-12.513-19.846h.001a307.41 307.41 0 0 1-10.923-20.627a310.278 310.278 0 0 1 10.89-20.637l-.001.001a307.318 307.318 0 0 1 12.413-19.761c7.613-.576 15.42-.876 23.31-.876H128c7.926 0 15.743.303 23.354.883a329.357 329.357 0 0 1 12.335 19.695a358.489 358.489 0 0 1 11.036 20.54a329.472 329.472 0 0 1-11 20.722Zm22.56-122.124c8.572 4.944 11.906 24.881 6.52 51.026c-.344 1.668-.73 3.367-1.15 5.09c-10.622-2.452-22.155-4.275-34.23-5.408c-7.034-10.017-14.323-19.124-21.64-27.008a160.789 160.789 0 0 1 5.888-5.4c18.9-16.447 36.564-22.941 44.612-18.3ZM128 90.808c12.625 0 22.86 10.235 22.86 22.86s-10.235 22.86-22.86 22.86s-22.86-10.235-22.86-22.86s10.235-22.86 22.86-22.86Z"></path></svg>
\ No newline at end of file

frontend/src/components/map/map-layer-card.tsx

+import {Card, CardContent, CardHeader, CardTitle} from "@/components/ui/card.tsx";
+import {RadioGroup, RadioGroupItem} from "@/components/ui/radio-group.tsx";
+import {Label} from "@/components/ui/label.tsx";
+
+function MapLayerCard() {
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle>Choose the layer:</CardTitle>
+      </CardHeader>
+      <CardContent>
+        <RadioGroup defaultValue="ndvi">
+          <div className="flex items-center space-x-2">
+            <RadioGroupItem value="ndvi" id="ndvi" />
+            <Label htmlFor="ndvi">NDVI</Label>
+          </div>
+          <div className="flex items-center space-x-2">
+            <RadioGroupItem value="lulc" id="lulc" />
+            <Label htmlFor="lulc">LULC</Label>
+          </div>
+          <div className="flex items-center space-x-2">
+            <RadioGroupItem value="construction" id="construction" />
+            <Label htmlFor="construction">Construction</Label>
+          </div>
+        </RadioGroup>
+      </CardContent>
+    </Card>
+  )
+}
+
+export {MapLayerCard};
\ No newline at end of file

frontend/src/components/map/map-viewer.tsx

+import {Map, Source, Layer} from 'react-map-gl/maplibre';
+
+interface MapViewerProps {
+  year: number
+}
+
+function MapViewer({year}: MapViewerProps) {
+  const tilesUrl = `/tiles/ndvi_${year}/{z}/{x}/{y}.png`;
+  return (
+    <Map initialViewState={{latitude: 48.78035, longitude: 9.17289, zoom: 13}}
+         mapStyle="https://basemaps.cartocdn.com/gl/positron-gl-style/style.json">
+      <Source key={year} id="ndvi" type="raster" tiles={[tilesUrl]} tileSize={256}/>
+      <Layer id="ndvi-layer" type="raster" source="ndvi" paint={{'raster-opacity': 0.85}}/>
+    </Map>
+  );
+}
+
+export {MapViewer}
\ No newline at end of file

frontend/src/components/timeline/timeline-slider.tsx

+import * as React from "react";
+import {useEffect, useMemo, useRef, useState} from "react";
+import {Slider} from "@/components/ui/slider";
+import {Button} from "@/components/ui/button";
+import {ChevronLeft, ChevronRight, Pause, Play} from "lucide-react";
+
+type TimelineSliderProps = {
+  min: number;
+  max: number;
+  value: number;
+  onChange: (next: number) => void;
+  step?: number;           // default: 1 (one year)
+  loop?: boolean;          // default: true
+  speeds?: number[];       // multipliers (0.25x, 0.5x, 1x, 2x, …)
+  label?: (v: number) => string; // format the center pill
+};
+
+export default function TimelineSlider({
+                                         min,
+                                         max,
+                                         value,
+                                         onChange,
+                                         step = 1,
+                                         loop = true,
+                                         speeds = [0.25, 0.5, 1, 2, 4],
+                                         label = (v) => String(v),
+                                       }: TimelineSliderProps) {
+  const [isPlaying, setIsPlaying] = useState(false);
+  const [speedIndex, setSpeedIndex] = useState(2); // 1x by default
+  const valueRef = useRef(value);
+  valueRef.current = value;
+
+  // Ticks for the ruler (minor each step; major every 5 steps)
+  const ticks = useMemo(() => {
+    const out: { year: number; major: boolean }[] = [];
+    for (let y = min; y <= max; y += step) {
+      out.push({year: y, major: (y % 5 === 0) || y === min || y === max});
+    }
+    return out;
+  }, [min, max, step]);
+
+  // Playback
+  useEffect(() => {
+    if (!isPlaying) return;
+    const msPerStep = Math.max(40, 1000 / speeds[speedIndex]); // clamp a little
+    const id = setInterval(() => {
+      const cur = valueRef.current;
+      const atEnd = cur >= max;
+      const next = atEnd ? (loop ? min : max) : Math.min(max, cur + step);
+      onChange(next);
+    }, msPerStep);
+    return () => clearInterval(id);
+  }, [isPlaying, speeds, speedIndex, loop, max, step, onChange, min]);
+
+  const dec = () => onChange(Math.max(min, value - step));
+  const inc = () => onChange(Math.min(max, value + step));
+  const togglePlay = () => setIsPlaying((p) => !p);
+  const cycleSpeed = () => setSpeedIndex((i) => (i + 1) % speeds.length);
+
+  // Keyboard support (←/→ step, Space play/pause, Home/End jump)
+  const onKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === "ArrowLeft") {
+      e.preventDefault();
+      dec();
+    } else if (e.key === "ArrowRight") {
+      e.preventDefault();
+      inc();
+    } else if (e.key === " ") {
+      e.preventDefault();
+      togglePlay();
+    } else if (e.key === "Home") {
+      e.preventDefault();
+      onChange(min);
+    } else if (e.key === "End") {
+      e.preventDefault();
+      onChange(max);
+    }
+  };
+
+  const pct = (y: number) => ((y - min) / (max - min)) * 100;
+
+  return (
+    <div
+      className="w-full rounded-full border bg-white/90 backdrop-blur supports-[backdrop-filter]:bg-white/60 shadow-lg px-3 py-2
+                 flex items-center gap-2"
+      onKeyDown={onKeyDown}
+      role="group"
+      aria-label="Timeline controls"
+    >
+      {/* Left controls */}
+      <div className="flex items-center gap-1">
+        <Button size="icon" variant="ghost" onClick={togglePlay} aria-label={isPlaying ? "Pause" : "Play"}>
+          {isPlaying ? <Pause className="h-5 w-5"/> : <Play className="h-5 w-5"/>}
+        </Button>
+        <Button size="icon" variant="ghost" onClick={dec} aria-label="Previous">
+          <ChevronLeft className="h-5 w-5"/>
+        </Button>
+        <Button size="icon" variant="ghost" onClick={inc} aria-label="Next">
+          <ChevronRight className="h-5 w-5"/>
+        </Button>
+      </div>
+
+      {/* Center: slider + ticks */}
+      <div className="flex-1 min-w-0">
+        <div className="relative pt-4 pb-5">
+          {/* Ruler ticks */}
+          <div className="pointer-events-none absolute left-0 right-0 top-1/2 -translate-y-1/2">
+            {ticks.map(({year, major}) => (
+              <div
+                key={year}
+                className="absolute -translate-x-1/2"
+                style={{left: `${pct(year)}%`}}
+              >
+                <div className={major ? "h-2 w-px bg-muted-foreground/70" : "h-1 w-px bg-muted-foreground/40"}/>
+                {major && (
+                  <div className="mt-1 text-[10px] leading-none text-muted-foreground/80 select-none -translate-x-1/2">
+                    {year}
+                  </div>
+                )}
+              </div>
+            ))}
+          </div>
+
+          {/* Slider track */}
+          <Slider
+            min={min}
+            max={max}
+            step={step}
+            value={[value]}
+            onValueChange={(vals) => onChange(vals[0])}
+            aria-label="Timeline"
+          />
+
+          {/* Current value pill */}
+          <div
+            className="absolute bottom-0 translate-y-1/2 -translate-x-1/2
+                       rounded-full bg-primary text-primary-foreground text-xs px-3 py-1 shadow"
+            style={{left: `${pct(value)}%`}}
+          >
+            {label(value)}
+          </div>
+        </div>
+      </div>
+
+      {/* Right: speed + loop indicator */}
+      <div className="flex items-center gap-2">
+        <Button variant="secondary" onClick={cycleSpeed} aria-label="Change playback speed">
+          {speeds[speedIndex]}x
+        </Button>
+        {loop ? (
+          <span className="text-xs text-muted-foreground select-none">Loop</span>
+        ) : null}
+      </div>
+    </div>
+  );
+}

frontend/src/index.css

+@import "tailwindcss";
+@import "tw-animate-css";
+
+@custom-variant dark (&:is(.dark *));
+
+@theme inline {
+  --radius-sm: calc(var(--radius) - 4px);
+  --radius-md: calc(var(--radius) - 2px);
+  --radius-lg: var(--radius);
+  --radius-xl: calc(var(--radius) + 4px);
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --color-card: var(--card);
+  --color-card-foreground: var(--card-foreground);
+  --color-popover: var(--popover);
+  --color-popover-foreground: var(--popover-foreground);
+  --color-primary: var(--primary);
+  --color-primary-foreground: var(--primary-foreground);
+  --color-secondary: var(--secondary);
+  --color-secondary-foreground: var(--secondary-foreground);
+  --color-muted: var(--muted);
+  --color-muted-foreground: var(--muted-foreground);
+  --color-accent: var(--accent);
+  --color-accent-foreground: var(--accent-foreground);
+  --color-destructive: var(--destructive);
+  --color-border: var(--border);
+  --color-input: var(--input);
+  --color-ring: var(--ring);
+  --color-chart-1: var(--chart-1);
+  --color-chart-2: var(--chart-2);
+  --color-chart-3: var(--chart-3);
+  --color-chart-4: var(--chart-4);
+  --color-chart-5: var(--chart-5);
+  --color-sidebar: var(--sidebar);
+  --color-sidebar-foreground: var(--sidebar-foreground);
+  --color-sidebar-primary: var(--sidebar-primary);
+  --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
+  --color-sidebar-accent: var(--sidebar-accent);
+  --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
+  --color-sidebar-border: var(--sidebar-border);
+  --color-sidebar-ring: var(--sidebar-ring);
+}
+
+:root {
+  --radius: 0.625rem;
+  --background: oklch(1 0 0);
+  --foreground: oklch(0.141 0.005 285.823);
+  --card: oklch(1 0 0);
+  --card-foreground: oklch(0.141 0.005 285.823);
+  --popover: oklch(1 0 0);
+  --popover-foreground: oklch(0.141 0.005 285.823);
+  --primary: oklch(0.21 0.006 285.885);
+  --primary-foreground: oklch(0.985 0 0);
+  --secondary: oklch(0.967 0.001 286.375);
+  --secondary-foreground: oklch(0.21 0.006 285.885);
+  --muted: oklch(0.967 0.001 286.375);
+  --muted-foreground: oklch(0.552 0.016 285.938);
+  --accent: oklch(0.967 0.001 286.375);
+  --accent-foreground: oklch(0.21 0.006 285.885);
+  --destructive: oklch(0.577 0.245 27.325);
+  --border: oklch(0.92 0.004 286.32);
+  --input: oklch(0.92 0.004 286.32);
+  --ring: oklch(0.705 0.015 286.067);
+  --chart-1: oklch(0.646 0.222 41.116);
+  --chart-2: oklch(0.6 0.118 184.704);
+  --chart-3: oklch(0.398 0.07 227.392);
+  --chart-4: oklch(0.828 0.189 84.429);
+  --chart-5: oklch(0.769 0.188 70.08);
+  --sidebar: oklch(0.985 0 0);
+  --sidebar-foreground: oklch(0.141 0.005 285.823);
+  --sidebar-primary: oklch(0.21 0.006 285.885);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.967 0.001 286.375);
+  --sidebar-accent-foreground: oklch(0.21 0.006 285.885);
+  --sidebar-border: oklch(0.92 0.004 286.32);
+  --sidebar-ring: oklch(0.705 0.015 286.067);
+}
+
+.dark {
+  --background: oklch(0.141 0.005 285.823);
+  --foreground: oklch(0.985 0 0);
+  --card: oklch(0.21 0.006 285.885);
+  --card-foreground: oklch(0.985 0 0);
+  --popover: oklch(0.21 0.006 285.885);
+  --popover-foreground: oklch(0.985 0 0);
+  --primary: oklch(0.92 0.004 286.32);
+  --primary-foreground: oklch(0.21 0.006 285.885);
+  --secondary: oklch(0.274 0.006 286.033);
+  --secondary-foreground: oklch(0.985 0 0);
+  --muted: oklch(0.274 0.006 286.033);
+  --muted-foreground: oklch(0.705 0.015 286.067);
+  --accent: oklch(0.274 0.006 286.033);
+  --accent-foreground: oklch(0.985 0 0);
+  --destructive: oklch(0.704 0.191 22.216);
+  --border: oklch(1 0 0 / 10%);
+  --input: oklch(1 0 0 / 15%);
+  --ring: oklch(0.552 0.016 285.938);
+  --chart-1: oklch(0.488 0.243 264.376);
+  --chart-2: oklch(0.696 0.17 162.48);
+  --chart-3: oklch(0.769 0.188 70.08);
+  --chart-4: oklch(0.627 0.265 303.9);
+  --chart-5: oklch(0.645 0.246 16.439);
+  --sidebar: oklch(0.21 0.006 285.885);
+  --sidebar-foreground: oklch(0.985 0 0);
+  --sidebar-primary: oklch(0.488 0.243 264.376);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.274 0.006 286.033);
+  --sidebar-accent-foreground: oklch(0.985 0 0);
+  --sidebar-border: oklch(1 0 0 / 10%);
+  --sidebar-ring: oklch(0.552 0.016 285.938);
+}
+
+@layer base {
+  * {
+    @apply border-border outline-ring/50;
+  }
+  body {
+    @apply bg-background text-foreground;
+  }
+}
\ No newline at end of file

frontend/src/lib/utils.ts

+import { clsx, type ClassValue } from "clsx"
+import { twMerge } from "tailwind-merge"
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs))
+}