diff --git a/src/app/(frontend)/globals.css b/src/app/(frontend)/globals.css
index 7bf6659..3f1437c 100644
--- a/src/app/(frontend)/globals.css
+++ b/src/app/(frontend)/globals.css
@@ -726,11 +726,23 @@ html:not([data-theme]) {
    ─────────────────────────────────────────────────────────────────────── */
 
 @media (prefers-color-scheme: dark) {
+  /* Prevent the browser from applying its own dark mode color transforms to buttons */
+  .fd-btn-primary,
+  .fd-btn-primary-dark,
+  .fd-btn-secondary,
+  .fd-btn-secondary-dark,
+  .fd-btn-navy,
+  .fd-btn-mint {
+    color-scheme: light;
+  }
+
+  /* fd-btn-primary: hover must not go navy-on-navy (sections are now dark) */
   .fd-btn-primary:hover {
     background-color: #ffffff;
     color: var(--color-fd-navy);
   }
 
+  /* fd-btn-secondary: navy text/border is invisible on dark sections */
   .fd-btn-secondary {
     color: #ffffff;
     border-color: #ffffff;
diff --git a/src/app/(frontend)/not-found-dark.tsx b/src/app/(frontend)/not-found-dark.tsx
deleted file mode 100644
index b4784c1..0000000
--- a/src/app/(frontend)/not-found-dark.tsx
+++ /dev/null
@@ -1,76 +0,0 @@
-import React from 'react'
-import type { Metadata } from 'next'
-
-export const metadata: Metadata = {
-  title: '404 – Sidan hittades inte | Fiber Direkt',
-  description: 'Sidan du letar efter verkar ha kopplats bort.',
-}
-
-export default function NotFound() {
-  return (
-    <main className="min-h-[calc(100vh-80px)] bg-fd-navy flex items-center overflow-hidden">
-      <div className="max-w-[1200px] mx-auto px-6 md:px-8 w-full pt-8 pb-16 md:pt-12 md:pb-20">
-        <div className="flex flex-col lg:flex-row items-center gap-12 lg:gap-20">
-
-          {/* ── Left: Text content ─────────────────────────────────────── */}
-          <div className="flex flex-col items-start gap-6 lg:gap-8 flex-1">
-
-            {/* Error code badge */}
-            <div className="inline-flex items-center gap-2 bg-white/10 rounded-full px-4 py-2">
-              <span className="w-2 h-2 rounded-full bg-red-500 animate-pulse" />
-              <span className="font-joey text-fd-small text-white/70 tracking-widest uppercase">
-                Felkod 404
-              </span>
-            </div>
-
-            {/* Heading */}
-            <div className="flex flex-col gap-3">
-              <h1 className="font-joey-heavy text-fd-display text-fd-yellow leading-none">
-                Oops!
-              </h1>
-              <p className="font-joey-medium text-fd-h2 text-white max-w-[460px] leading-snug">
-                Vi kan inte hitta sidan du letar efter.
-              </p>
-            </div>
-
-            {/* Body */}
-            <p className="font-joey text-fd-body-lg text-white/60 max-w-[420px]">
-              Det verkar som kabeln kopplades bort någonstans längs vägen.
-              Prova att gå tillbaka till startsidan.
-            </p>
-
-            {/* CTA */}
-            <div className="mt-2">
-              <a href="/" className="fd-btn-primary">
-                Tillbaka till startsidan
-              </a>
-            </div>
-          </div>
-
-          {/* ── Right: Modem SVG illustration ──────────────────────────── */}
-          <div className="hidden lg:flex flex-1 items-center justify-center w-full max-w-[380px] lg:max-w-none">
-            <div className="relative w-full max-w-[460px]">
-
-<svg
-                viewBox="0 0 1536 1024"
-                fill="none"
-                xmlns="http://www.w3.org/2000/svg"
-                className="w-full h-auto relative opacity-90"
-                aria-hidden="true"
-              >
-                <path
-                  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-12h4l2,2ZM738,477l1-4h7l4,2-10,4-2-2ZM794,473l-29,9-4-1,2-2,26-8,5,2ZM830,455l2,7-1,6-3,3-15,5v-15l17-6ZM792,449l-1,2-7,1-1,2-31,9-13-1,1-2,12-1,24-7h6l2-3,4-1,4,1ZM791,453l1-2,8-1,2-4,26,6-17,6-20-5ZM743,434l4-2,3,1-3,2-4-1ZM798,442l-2,3-16,2-29,9h-6v-2l22-6v-2l-10,1-1-3h-5l-10,4-1-1,2-3,39-10,4-3,1,3-2,2-26,7v2l16-3,10-4,14,4ZM777,424l-23,8-3-1v-5l2-2,2,3,19-5,3,2ZM786,416l-6,4-4-1,4-3h6ZM830,384l2,66-4,2-1-66,3-2ZM805,367l2,19-14-1-2-2,1-1,12,1v-10l-2-3,3-3ZM881,350l-2,4,4,1,1-4-3-1ZM845,345l-5-1-113,27-8,6-2,5-1,135,4,9,10,1,111-34,7-6,2-5v-130l-5-7ZM844,349l3,5-1,130-5,5-114,35-4-1-3-5,1-138,7-6,85-19,24-7,7,1ZM953,333l-2,5,4,1,1-6h-3ZM940,331l-9,1-35,10v20l-6,3-15,3-3,3-1,86,3,3h7l79-24,4-3,1-84-1-2h-6l-15,4-1-18-2-2ZM891,439l2,2v11l-17,5-2-3v-10l2-2,15-3ZM941,437l-2,2-35,11h-9l3-3,35-11,8,1ZM927,434l-2,2-25,7-4-1,23-9,8,1ZM874,438l2-5,11,3-11,4-2-2ZM940,423l2,1-1,11-2-2,1-10ZM961,418l1,12-6,4-11,3v-13l16-6ZM918,416l-1,3-33,9-2-2,2-2,12-2,21-7,1,1ZM921,416l14-7,25,6-16,6-23-5ZM884,408l-5,3-4-1,6-3,3,1ZM930,408l-13,5-10,1-23,7-9-1,2-2h7l14-4v-4l24-7,1,2-6,2v2l8-2,5,1ZM914,400l-1,2-18,6-8,1-2-2,3-3,9-1,11-4,6,1ZM926,395l1,6-3,1-1-1,2-1,1-5ZM911,388l-3,3-29,8-4-1,1-4,3-2,2,3h5l2-3,19-5,4,1ZM920,381l-3,3-3-2,6-1ZM920,368l2,2-1,11-2-1,1-12ZM960,351l2,1-1,63-2-1-1-59,2-4ZM937,335l2,5-1,13-5-2,3-1-1-13,2-2ZM977,314l-9-1-106,26-4,4-3,8v128l4,6h11l102-32,7-6,2-5v-120l-4-8ZM973,316l4,5,1,118-2,6-5,5-107,33-6-6,1-130,7-6,107-25ZM991,304v2h2v-2h-2ZM1018,253l-3-2h-9l-272,61-247,52-63,15-162,33-85,20v3l5,5,787-172,35-9h8l2,2,1,19h-2l-1-6-3-4h-11l-170,40-405,91-224,48-20,7-5,6-3,9-2-7,1-16,7-5v-3l-4,1-2,3h-2v-4h-2l-5,12v299l3,8,4,3h5v-2h-3l-3-5,1-14,8,15,9,1,617-204,3-4v-2l-29,8-49,18h-4l-184,62h-5l-4,3-45,15-29,8-39,15-3-2-5,4h-11l-4,4-8,3-4-1-15,7h-6l-4,3-7,2-3-1-1,2-11,4h-6l-11,6-20,5-14,6h-7l-14,7-7-1-6,5-6,2-5-1-3,3-9,3-4-2-7,6-10,3-4-2-6,5-9,1-1-2-4,1-3-2v-5l5-4v-2h-2l-5,6-1-10,2-4-3-1v-244l2-10,8-9,18-5v4h3v-2l6-5h10l8-4h12l4-3,15-4,3,2,11-5,11-2,3,1,9-4,11-1,3-2,42-9,4,1,2-2,12-3,2,1-1,3h2v-2l6-4,32-7,4,1,5,8v237l-4,15h2l4-8,2-10v-222l-1-14-6-8,2-2,18-2,25-7,4,1,10-4,20-3,29-8,4,1,8-4,38-7,114-27,17-2,17-5,3,1,9-4,54-11,12-4h7l19-6,43-8,7-3,81-17,7-3,5,1,7-4,6,2,3-4,7,1,2,2-2,7h2l1-4,2,1v9l-5,4v2l4-3,1,1v28l-1,3-3,1v2l3-2,1,1v60l-4,4v2l3-2,1,1v59l-4,2v2h4v4l-2,2,2,6-2,4-12,10-5-1-5,4-14,5-4-1-17,8h-5l-16,7-52,17-2,3,5,2,127-43,3-10,5-5,4,2,2-4,1,6-2,8h2l4-12v-190l2-18-2-11ZM1013,303l1,158-2,1-1-155,2-4ZM1017,246v2l5,2-2-4h-3ZM982,237v2h2v-2h-2ZM930,228v3h2v-3h-2ZM917,226v2h3v-2h-3ZM912,225v2h3v-2h-3ZM907,224v2h2v-2h-2ZM900,223v2h3v-2h-3ZM895,222v2h2v-2h-2ZM888,221v2h3v-2h-3ZM882,220v2h2v-2h-2ZM876,219v2h2v-2h-2ZM801,207v2h2v-2h-2ZM330,162l51,8,32,8,18-3v-2l-54-9-1,3-19-3-2-2,3-1v-2M370,154h15l71,16,18-2v-2l-87-14M998,233l9,3-3,2-15,1-1,3-21,3-7,3-129,28-132,26-73,17-51,9-71,17-49,8-46,12-231,46-24,9-7-1v2l5,3,11-5,37-9,189-38,68-16,66-12,35-9,216-44,243-53,8,6,3,11-2,221-7,13-5,4-131,44-1,3,7,1,20,8h5l35-13h6l2-3,11-1,1-3,11-3,1-3,10-1,4-4,11-3v-2l8-4v-2h-9l18-9,9-13,3-12v-225l-4-10-12-9-37-7-486-76"
-                  fill="#9DB8CC"
-                  fillRule="evenodd"
-                  opacity="0.85"
-                />
-              </svg>
-
-            </div>
-          </div>
-
-        </div>
-      </div>
-    </main>
-  )
-}
diff --git a/src/app/(frontend)/not-found.tsx b/src/app/(frontend)/not-found.tsx
index 5586a73..411cc77 100644
--- a/src/app/(frontend)/not-found.tsx
+++ b/src/app/(frontend)/not-found.tsx
@@ -2,7 +2,6 @@ import React from 'react'
 import type { Metadata } from 'next'
 import { FDButton } from '@/components/FDButton'
 
-
 export const metadata: Metadata = {
   title: '404 – Sidan hittades inte | Fiber Direkt',
   description: 'Sidan du letar efter verkar ha kopplats bort.',
@@ -10,7 +9,7 @@ export const metadata: Metadata = {
 
 export default function NotFound() {
   return (
-    <main className="min-h-[calc(100vh-80px)] bg-white flex items-center overflow-hidden">
+    <main className="min-h-[calc(100vh-80px)] bg-white dark:bg-fd-navy flex items-center overflow-hidden">
       <div className="max-w-[1200px] mx-auto px-6 md:px-8 w-full pt-8 pb-16 md:pt-12 md:pb-20">
         <div className="flex flex-col lg:flex-row items-center gap-12 lg:gap-20">
 
@@ -18,25 +17,25 @@ export default function NotFound() {
           <div className="flex flex-col items-start gap-6 lg:gap-8 flex-1">
 
             {/* Error code badge */}
-            <div className="inline-flex items-center gap-2 bg-fd-navy/10 rounded-full px-4 py-2">
+            <div className="inline-flex items-center gap-2 bg-fd-navy/10 dark:bg-white/10 rounded-full px-4 py-2">
               <span className="w-2 h-2 rounded-full bg-red-500 animate-pulse" />
-              <span className="font-joey text-fd-small text-fd-navy/60 tracking-widest uppercase">
+              <span className="font-joey text-fd-small text-fd-navy/60 dark:text-white/60 tracking-widest uppercase">
                 Felkod 404
               </span>
             </div>
 
             {/* Heading */}
             <div className="flex flex-col gap-3">
-              <h1 className="font-joey-heavy text-fd-display text-fd-navy leading-none">
+              <h1 className="font-joey-heavy text-fd-display text-fd-navy dark:text-fd-yellow leading-none">
                 Oops!
               </h1>
-              <p className="font-joey-medium text-fd-h2 text-fd-navy max-w-[460px] leading-snug">
+              <p className="font-joey-medium text-fd-h2 text-fd-navy dark:text-white max-w-[460px] leading-snug">
                 Vi kan inte hitta sidan du letar efter.
               </p>
             </div>
 
             {/* Body */}
-            <p className="font-joey text-fd-body-lg text-fd-navy/60 max-w-[420px]">
+            <p className="font-joey text-fd-body-lg text-fd-navy/60 dark:text-white/60 max-w-[420px]">
               Det verkar som kabeln kopplades bort någonstans längs vägen.
               Prova att gå tillbaka till startsidan.
             </p>
@@ -53,11 +52,11 @@ export default function NotFound() {
           <div className="hidden lg:flex flex-1 items-center justify-center w-full max-w-[380px] lg:max-w-none">
             <div className="relative w-full max-w-[460px]">
 
-<svg
+              <svg
                 viewBox="0 0 1536 1024"
                 fill="none"
                 xmlns="http://www.w3.org/2000/svg"
-                className="w-full h-auto relative opacity-90"
+                className="w-full h-auto relative opacity-90 dark:opacity-40"
                 aria-hidden="true"
               >
                 <path
@@ -65,6 +64,7 @@ export default function NotFound() {
                   fill="#0E2338"
                   fillRule="evenodd"
                   opacity="0.85"
+                  className="dark:fill-white"
                 />
               </svg>