diff --git a/README.md b/README.md
index 56ecb93..55d05ab 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@
   <img alt="License: MIT" src="https://img.shields.io/badge/license-MIT-blue.svg">
   <img alt="Python 3.10+" src="https://img.shields.io/badge/python-3.10%2B-blue.svg">
   <img alt="Hyprland 0.55+" src="https://img.shields.io/badge/hyprland-0.55%2B-1a9fb2.svg">
-  <img alt="tests" src="https://img.shields.io/badge/tests-170%20passing-brightgreen.svg">
+  <img alt="tests" src="https://img.shields.io/badge/tests-219%20passing-brightgreen.svg">
 </p>
 
 ---
diff --git a/packaging/PKGBUILD b/packaging/PKGBUILD
index 782d431..296a621 100644
--- a/packaging/PKGBUILD
+++ b/packaging/PKGBUILD
@@ -2,7 +2,7 @@
 pkgname=hyprvalidate
 pkgver=0.4.0
 pkgrel=1
-pkgdesc="Convert and validate Hyprland Lua configs against Hyprland's real API schema"
+pkgdesc="Validate, auto-fix, and migrate Hyprland Lua configs against Hyprland's real API schema"
 arch=('any')
 url="https://github.com/Paritsingla7/hyprvalidate"
 license=('MIT')
diff --git a/pyproject.toml b/pyproject.toml
index 1438ec7..55668dd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [project]
 name = "hyprvalidate"
 version = "0.4.0"
-description = "Convert and validate Hyprland Lua configs against Hyprland's real API schema"
+description = "Validate, auto-fix, and migrate Hyprland Lua configs against Hyprland's real API schema"
 readme = "README.md"
 requires-python = ">=3.10"
 license = "MIT"
diff --git a/site/index.html b/site/index.html
index 0b65a6d..10a9fd3 100644
--- a/site/index.html
+++ b/site/index.html
@@ -3,8 +3,8 @@
 <head>
 <meta charset="utf-8" />
 <meta name="viewport" content="width=device-width, initial-scale=1" />
-<title>hyprvalidate — Hyprland config converter &amp; validator</title>
-<meta name="description" content="Convert hyprland.conf to Lua and validate Hyprland Lua configs against Hyprland's real API schema. Free, open source, runs in your browser." />
+<title>hyprvalidate — validate, fix, and migrate Hyprland Lua configs</title>
+<meta name="description" content="Validate and auto-fix Hyprland Lua configs against Hyprland's real API schema, migrate an old hyprland.conf into modular Lua files, and catch what a future Hyprland update would break before it does. Free, open source, runs in your browser." />
 <link rel="canonical" href="https://paritsingla7.github.io/hyprvalidate/" />
 <meta name="author" content="Paritsingla7" />
 <meta name="robots" content="index, follow" />
@@ -12,25 +12,25 @@
 <meta property="og:type" content="website" />
 <meta property="og:site_name" content="hyprvalidate" />
 <meta property="og:url" content="https://paritsingla7.github.io/hyprvalidate/" />
-<meta property="og:title" content="hyprvalidate — convert hyprland.conf to Lua, and validate it" />
-<meta property="og:description" content="Migrating to Hyprland 0.55's Lua config? Convert your old hyprland.conf into modular Lua files and validate the result against Hyprland's real API schema. Try it in your browser." />
+<meta property="og:title" content="hyprvalidate — keep your Hyprland Lua config working" />
+<meta property="og:description" content="Validate and auto-fix a Hyprland Lua config against Hyprland's real API schema, migrate an old hyprland.conf into modular Lua files, and check what a future Hyprland update would break. Try it in your browser." />
 <meta name="twitter:card" content="summary_large_image" />
-<meta name="twitter:title" content="hyprvalidate — convert hyprland.conf to Lua, and validate it" />
-<meta name="twitter:description" content="Convert your old hyprland.conf into modular Lua files and validate the result against Hyprland's real API schema. Runs in your browser." />
+<meta name="twitter:title" content="hyprvalidate — keep your Hyprland Lua config working" />
+<meta name="twitter:description" content="Validate, auto-fix, and migrate Hyprland Lua configs against Hyprland's real API schema. Runs in your browser." />
 
 <script type="application/ld+json">
 {
   "@context": "https://schema.org",
   "@type": "SoftwareApplication",
   "name": "hyprvalidate",
-  "description": "Converts an old hyprland.conf (hyprlang) config into Hyprland's Lua config format, and validates any Hyprland Lua config against Hyprland's own autogenerated API schema.",
+  "description": "Validates and auto-fixes a Hyprland Lua config against Hyprland's own autogenerated API schema, migrates an old hyprland.conf (hyprlang) config into Lua, and checks whether a config will still work after a Hyprland update.",
   "applicationCategory": "DeveloperApplication",
   "operatingSystem": "Linux",
   "url": "https://paritsingla7.github.io/hyprvalidate/",
   "downloadUrl": "https://github.com/Paritsingla7/hyprvalidate",
   "codeRepository": "https://github.com/Paritsingla7/hyprvalidate",
   "programmingLanguage": "Python",
-  "softwareVersion": "0.1.0",
+  "softwareVersion": "0.4.0",
   "license": "https://opensource.org/licenses/MIT",
   "author": { "@type": "Person", "name": "Paritsingla7" },
   "offers": { "@type": "Offer", "price": "0", "priceCurrency": "USD" }
@@ -38,30 +38,23 @@
 </script>
 <style>
   :root {
-    --bg: #eef2f5;
-    --surface: #e2e8ed;
-    --surface-2: #d7dfe5;
-    --ink: #0b1622;
-    --ink-soft: #3d4f5f;
-    --line: #c3cfd7;
-    --line-strong: #9fb0bb;
-    --accent: #0e8fa3;
-    --accent-ink: #06414a;
-    --warn: #b5602a;
-    --warn-ink: #7a3f18;
-    --danger: #b5402a;
+    /* Dark is this site's actual theme, not a system-preference fallback -
+       these are the base tokens now, not gated behind a media query. */
+    --bg: #0b1622;
+    --surface: #101f30;
+    --surface-2: #16283c;
+    --ink: #dce8f2;
+    --ink-soft: #8fa6bd;
+    --line: #223449;
+    --line-strong: #33506b;
+    --accent: #5ec8d8;
+    --accent-ink: #bdeef5;
+    --warn: #e0834f;
+    --warn-ink: #f4c6a4;
+    --danger: #e0834f;
     --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Consolas, "Liberation Mono", monospace;
     --sans: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
   }
-  @media (prefers-color-scheme: dark) {
-    :root {
-      --bg: #0b1622; --surface: #101f30; --surface-2: #16283c;
-      --ink: #dce8f2; --ink-soft: #8fa6bd;
-      --line: #223449; --line-strong: #33506b;
-      --accent: #5ec8d8; --accent-ink: #bdeef5;
-      --warn: #e0834f; --warn-ink: #f4c6a4; --danger: #e0834f;
-    }
-  }
   :root[data-theme="dark"] {
     --bg: #0b1622; --surface: #101f30; --surface-2: #16283c;
     --ink: #dce8f2; --ink-soft: #8fa6bd;
@@ -247,8 +240,8 @@
   <section class="hero">
     <div>
       <p class="eyebrow">§0 — schema-driven, not guessed</p>
-      <h1 class="headline">Convert <span class="dim">hyprland.conf</span> to Lua. Get back working config.</h1>
-      <p class="lede">Hyprland 0.55 replaced <code>hyprland.conf</code> with a Lua config. hyprvalidate migrates your old hyprlang config into a modular set of Lua files — organized the way Hyprland's own docs recommend, not dumped into one file — by looking up every dispatcher and value type in Hyprland's real API schema instead of a hand-typed table. Then it validates the result, and any Hyprland Lua config you already have, the same way.</p>
+      <h1 class="headline">Keep your <span class="dim">Hyprland Lua</span> config working.</h1>
+      <p class="lede">Hyprland 0.55 replaced <code>hyprland.conf</code> with a Lua config, and the API underneath it is still evolving. hyprvalidate checks any Hyprland Lua config against Hyprland's real, autogenerated API schema — never a hand-typed table that drifts — and auto-fixes what has exactly one right answer. Migrating an old <code>hyprland.conf</code>? It converts that into modular Lua files first, the way Hyprland's own docs recommend, then validates the result the same way.</p>
       <div class="cta-row">
         <a class="btn primary" href="#demo">Try it on your config →</a>
         <a class="btn" href="#install">Install</a>
@@ -331,7 +324,7 @@ <h2 class="section-title"><span class="tag">§3</span> The validator</h2>
 
     <div class="annot">
       <div class="src">HL.BindOptions, the installed stub</div>
-      <div class="note">The Lua wiki's own examples use <code>{ mouse = true }</code> — that field doesn't exist in the real schema. The real replacement is <code>drag</code>.</div>
+      <div class="note">Real-world configs (Garuda Linux's distribution settings, the sea-shell project) use <code>{ mouse = true }</code> — a real, implemented flag in Hyprland's own source, just missing from the schema Hyprland itself generates. hyprvalidate can't invent a field the stub doesn't have — flagged here as a known gap, not silently ignored.</div>
     </div>
 
     <div class="cards">
@@ -351,8 +344,46 @@ <h3>Runs on directories too</h3>
 
   <hr class="ruled" />
 
+  <section id="fix">
+    <h2 class="section-title"><span class="tag">§4</span> The fixer</h2>
+    <p class="section-dek">For the findings with exactly one correct answer, <code>check</code> can just make the correction — never a guess, only what's mechanically unambiguous.</p>
+    <div class="cards">
+      <div class="card">
+        <div class="cmd">$ hyprvalidate check config.lua --fix</div>
+        <h3>Two corrections, both provably safe</h3>
+        <p>A bare identifier where a string was meant (<code>accel_profile = flat</code> → <code>"flat"</code> — the exact bug that changed a real user's mouse sensitivity after a migration), and a dispatcher factory referenced but never called. Patches the source directly, re-checks, and won't write a fix that turns out to break something else.</p>
+        <div class="codebit">[possible_missing_quotes] 'input.accel_profile' is set to the bare<br>&nbsp;&nbsp;identifier 'flat' — did you mean the string "flat"?</div>
+      </div>
+      <div class="card">
+        <h3>Everything else stays reported, not guessed</h3>
+        <p>An unknown dispatcher or config key (which real name was meant?), a type or arity mismatch, two binds fighting over the same key combo — no single correct fix exists, so <code>--fix</code> leaves them exactly as <code>check</code> reports them.</p>
+      </div>
+    </div>
+  </section>
+
+  <hr class="ruled" />
+
+  <section id="diff-impact">
+    <h2 class="section-title"><span class="tag">§5</span> Stay working through the next update</h2>
+    <p class="section-dek">Hyprland's Lua API is still young — a real config field was renamed one day after Lua config first shipped. <code>diff-impact</code> checks a config against what's changed between two schema versions, so you find out before you update, not after.</p>
+    <div class="cards">
+      <div class="card">
+        <div class="cmd">$ hyprvalidate diff-impact config.lua --from old.json --to new.json</div>
+        <h3>Only what your config actually uses</h3>
+        <p>Cross-references the schema diff against your config's real usage, not Hyprland's whole API surface — most changes between two versions won't touch anything you wrote.</p>
+        <div class="codebit">[possible_rename] 'allow' on HL.PermissionSpec no longer exists<br>&nbsp;&nbsp;↳ possibly renamed to 'mode' (heuristic guess, not confirmed)</div>
+      </div>
+      <div class="card">
+        <h3>Warns by default, never claims certainty</h3>
+        <p>Exits <code>0</code> even when it finds something — a schema diff is evidence of a possible behavior change, not proof of one. <code>--fail-on-impact</code> opts a CI job into treating it as a failure instead.</p>
+      </div>
+    </div>
+  </section>
+
+  <hr class="ruled" />
+
   <section id="install">
-    <h2 class="section-title"><span class="tag">§4</span> Install</h2>
+    <h2 class="section-title"><span class="tag">§6</span> Install</h2>
     <p class="section-dek">Requires Hyprland v0.55+ (the Lua config API) and Python 3.10+.</p>
 
     <div class="install-tabs" role="tablist" aria-label="Install method">