diff --git a/apps/docs/astro.config.mjs b/apps/docs/astro.config.mjs
new file mode 100644
index 0000000..11f2b07
--- /dev/null
+++ b/apps/docs/astro.config.mjs
@@ -0,0 +1,137 @@
+// Written by `blume eject`. This is your Astro config now: edit it freely.
+import { availableParallelism } from "node:os";
+import { fileURLToPath } from "node:url";
+import { defineConfig, fontProviders } from "astro/config";
+import mdx from "@astrojs/mdx";
+import tailwindcss from "@tailwindcss/vite";
+import { blumeMarkdownProcessor, blumeMdxProcessor, blumeShikiTransformers, blumeTwoslashTransformer } from "blume/markdown";
+import react from "@astrojs/react";
+import { blumeIntegration, includeHmrPlugin, mdxSourceErrorsPlugin, prerenderDepsPlugin } from "blume/astro";
+
+export default defineConfig({
+  root: ".",
+  srcDir: "./src",
+  outDir: "./dist",
+  publicDir: "./public",
+  output: "static",
+  site: "https://lc.prd.lk",
+  redirects: 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gest-substring-without-repeating-characters","/sliding-window/max-consecutive-ones-iii","/sliding-window/maximum-average-subarray-i","/sliding-window/minimum-size-subarray-sum","/sliding-window/minimum-window-substring","/sliding-window/permutation-in-string","/stack","/stack/basic-calculator","/stack/evaluate-reverse-polish-notation","/stack/min-stack","/stack/simplify-path","/stack/valid-parentheses","/topological-sort","/topological-sort/course-schedule","/topological-sort/course-schedule-ii","/tree-bfs","/tree-bfs/binary-tree-level-order-traversal","/tree-bfs/binary-tree-right-side-view","/tree-bfs/count-good-nodes-in-binary-tree","/tree-dfs","/tree-dfs/invert-binary-tree","/tree-dfs/lowest-common-ancestor-of-a-binary-tree","/tree-dfs/maximum-depth-of-binary-tree","/trie","/trie/design-add-and-search-words-data-structure","/trie/implement-trie-prefix-tree","/two-pointers","/two-pointers/3sum","/two-pointers/container-with-most-water","/two-pointers/is-subsequence","/two-pointers/remove-duplicates-from-sorted-array-ii","/two-pointers/reverse-string","/two-pointers/rotate-array","/two-pointers/squares-of-a-sorted-array","/two-pointers/trapping-rain-water","/two-pointers/two-sum-ii-input-array-is-sorted","/two-pointers/valid-palindrome","/union-find","/union-find/number-of-connected-components-in-an-undirected-graph","/union-find/redundant-connection"],"homeLinkHeader":"</openapi.json>; rel=\"service-desc\"; type=\"application/json\", </index.md>; rel=\"alternate\"; type=\"text/markdown\""})],
+  markdown: {
+    processor: blumeMarkdownProcessor({ ...{"basePath":"","codeThemes":{"dark":"github-dark","light":"github-light"},"contentRoot":"content","deployBase":"","externalLinks":false,"headingAnchors":true,"variables":{}}, dataFile: fileURLToPath(new URL("./src/generated/data.json", import.meta.url)) }),
+    shikiConfig: {
+      themes: {
+        light: "github-light",
+        dark: "github-dark",
+      },
+      defaultColor: false,
+      transformers: [blumeTwoslashTransformer(), ...blumeShikiTransformers({"icons":true})],
+    },
+  },
+  devToolbar: { enabled: false },
+  // One canonical URL per page: canonicals, the sitemap, and hreflang all use
+  // the slashless form, so the slashed spelling is not a second address. Astro
+  // applies this itself — an on-demand route redirects, and the integration
+  // has the dev server redirect too, ahead of Astro's own 404 — and the Vercel
+  // adapter turns it into the platform's 308 route, so the Build Output config
+  // needs no hand-spliced redirect (see deploy/vercel-negotiation.ts). Static hosts
+  // serve the `index.html` directory layout as they always did.
+  trailingSlash: "never",
+  // The layouts render Astro's <ClientRouter />, and its in-place swaps read
+  // from the prefetch cache — fetching every link on hover/viewport hides the
+  // request latency behind the user's intent, so most navigations swap
+  // instantly.
+  prefetch: { prefetchAll: true },
+  // Prerender several pages at once. Rendering is single-threaded, but a
+  // page's OG card renders on a native thread and its HTML is written
+  // asynchronously, so the main thread would otherwise idle behind each
+  // page's off-thread work. Capped at 8: the gain flattens there and beyond it
+  // the overlap only adds memory.
+  build: { concurrency: Math.min(8, availableParallelism()) },
+  vite: {
+    plugins: [tailwindcss(), includeHmrPlugin(fileURLToPath(new URL("./src/generated/includes.json", import.meta.url))), mdxSourceErrorsPlugin(), prerenderDepsPlugin()],
+    build: {
+      chunkSizeWarningLimit: 2048,
+      rolldownOptions: {
+        onLog(level, log, handler) {
+          if (log.code === "MODULE_LEVEL_DIRECTIVE" && String(log.message).includes("use astro:head-inject")) {
+            return;
+          }
+          handler(level, log);
+        },
+      },
+    },
+    // Everything hydration can reach must be part of the dev dep optimizer's
+    // FIRST run. The Vite root is the generated runtime, so user pages,
+    // islands, and aliased components live outside it and are only crawled
+    // when first requested — and `react/compiler-runtime` is injected by the
+    // React Compiler, so no source scan can ever see it. A dependency discovered after
+    // hydration begins triggers a mid-session re-optimization whose new
+    // generation imports React through new `?v=` URLs; the browser then
+    // evaluates a second React copy and every island tears down with
+    // "Invalid hook call" (#157). `entries` points the startup scanner at
+    // the user's files (the scanner follows their imports, so their deps land
+    // in the initial optimization); the compiler runtime rides the include
+    // list because only the transform pipeline knows it exists.
+    //
+    // The mermaid/epub includes fix CJS interop instead: both lazy client-side
+    // imports land on CJS/UMD files (mermaid statically imports dayjs as CJS,
+    // epub-gen-memory's browser bundle is a browserified UMD) that break when
+    // served as raw ESM — mermaid throws on load and the EPUB export throws
+    // `epub is not a function`. They resolve through the `blume` package
+    // (they aren't direct deps of the generated project), so the nested
+    // `blume > x` form is required, and epub-gen-memory must name the
+    // `/bundle` subpath that is actually imported: optimizing the package
+    // root leaves that entry out. Production (Rollup) already handles the
+    // interop, so all of this only affects dev.
+    //
+    // The search adapter's client library rides the list for the same reason
+    // as the compiler runtime: the search dialog lazy-imports it on first
+    // open, and discovering it then re-optimizes and reloads the page.
+    optimizeDeps: {
+      entries: ["./pages/**/*.astro","./islands/**/*.{jsx,svelte,tsx,vue}"],
+      include: ["blume > mermaid","blume > @orama/orama"],
+    },
+    // Blume's render-time deps are forced external on both build environments so
+    // native bindings resolve at runtime and isolated linkers don't bundle
+    // symlinked store copies (which would surface their children as unresolvable
+    // imports). See RENDER_EXTERNAL_DEPS / prerenderDepsPlugin.
+    //
+    // The SSR externals go through the legacy `ssr.external` key rather than
+    // `environments.ssr`: defining a user-owned `environments.ssr` block
+    // collides with the internal environment Astro 7 builds the server under and
+    // detaches the adapter's server entrypoint from the rolldown input, so the
+    // SSR entry is emitted as `index.mjs` instead of the `entry.mjs` the
+    // Vercel adapter's `astro:build:done` hook then fails to find. `prerender`
+    // is Astro-only and has no legacy equivalent, so it stays under `environments`.
+    ssr: { external: ["@astrojs/markdown-satteri","@pierre/diffs","@shikijs/transformers","@takumi-rs/core","@takumi-rs/helpers","@takumi-rs/wasm","github-slugger","katex","shiki","simple-icons","takumi-js","takumi-js/helpers","zod"] },
+    environments: {
+      prerender: { resolve: { external: ["@astrojs/markdown-satteri","@pierre/diffs","@shikijs/transformers","@takumi-rs/core","@takumi-rs/helpers","@takumi-rs/wasm","github-slugger","katex","shiki","simple-icons","takumi-js","takumi-js/helpers","zod"] } },
+    },
+    resolve: {
+      alias: {
+        "blume:ask": fileURLToPath(new URL("./src/generated/Ask.astro", import.meta.url)),
+        "blume:consent-client": fileURLToPath(new URL("./src/generated/consent-client.ts", import.meta.url)),
+        "blume:examples": fileURLToPath(new URL("./src/generated/examples.ts", import.meta.url)),
+        "blume:examples-theme": fileURLToPath(new URL("./src/generated/examples.css", import.meta.url)),
+        "blume:features": fileURLToPath(new URL("./src/generated/features.ts", import.meta.url)),
+        "blume:search-client": fileURLToPath(new URL("./src/generated/search-client.ts", import.meta.url)),
+        "blume:theme": fileURLToPath(new URL("./src/generated/app.css", import.meta.url)),
+        "blume:ask-data": fileURLToPath(new URL("./src/generated/ask-data.json", import.meta.url)),
+        "blume:content-assets": fileURLToPath(new URL("./src/generated/content-assets.json", import.meta.url)),
+        "blume:data": fileURLToPath(new URL("./src/generated/data.json", import.meta.url)),
+        "blume:mcp-data": fileURLToPath(new URL("./src/generated/mcp-data.json", import.meta.url)),
+        "blume:openapi": fileURLToPath(new URL("./src/generated/openapi.json", import.meta.url)),
+        "blume:raw-markdown": fileURLToPath(new URL("./src/generated/raw-markdown.json", import.meta.url)),
+        "blume:rss": fileURLToPath(new URL("./src/generated/rss.json", import.meta.url)),
+        "blume:search-index": fileURLToPath(new URL("./src/generated/search.json", import.meta.url)),
+      },
+    },
+    server: {
+      fs: {
+        allow: ["."],
+      },
+    },
+  },
+});
diff --git a/apps/docs/src/content.config.ts b/apps/docs/src/content.config.ts
new file mode 100644
index 0000000..1b6fa80
--- /dev/null
+++ b/apps/docs/src/content.config.ts
@@ -0,0 +1,27 @@
+// Generated by Blume. Do not edit.
+import { defineCollection } from "astro:content";
+import { glob } from "astro/loaders";
+import { withIncludeRefresh } from "blume/astro";
+import { pageCollectionSchema } from "blume/core/schema.ts";
+
+// withIncludeRefresh keeps <include>-bearing pages fresh: plain .md entries
+// are rendered at sync time and digest-cached on the page file alone, so a
+// partial edit (or a warm-cache rebuild after one) would serve stale HTML.
+//
+// pageCollectionSchema is the scan's page front-matter schema, so entry.data
+// is typed and normalized the same way; it passes custom keys through and
+// falls back to defaults for a page the scan already dropped as invalid.
+//
+// Astro's content store re-parses an entry only when its file or this config
+// changes, so naming the Blume version (2.2.4) here re-parses
+// every entry after an upgrade: none keeps what an older schema produced.
+const docs = defineCollection({
+  loader: withIncludeRefresh(glob({
+    pattern: ["**/*.{md,mdx}","!**/_*","!**/.*","!**/.blume-verify/**","!**/.cache/**","!**/.git/**","!**/.next/**","!**/.turbo/**","!**/.vercel/**","!**/dist/**","!**/node_modules/**"],
+    base: "content",
+    generateId: ({ entry }) => entry,
+  }), "./src/generated/includes.json"),
+  schema: pageCollectionSchema,
+});
+
+export const collections = { docs };