diff --git a/src/lib/components/NewsletterSignup.svelte b/src/lib/components/NewsletterSignup.svelte
index 662fd8ffb..f74cc6f9d 100644
--- a/src/lib/components/NewsletterSignup.svelte
+++ b/src/lib/components/NewsletterSignup.svelte
@@ -34,7 +34,7 @@
 
 <div class="newsletter-signup">
 	<div class="newsletter-content">
-		<h3>{headingText}</h3>
+		<h3 class="toc-exclude">{headingText}</h3>
 		<p>{descriptionText}</p>
 
 		<!-- Direct POST to Substack API in new tab -->
diff --git a/src/lib/components/Toc.svelte b/src/lib/components/Toc.svelte
index 4f8320a03..6e69bb1ed 100644
--- a/src/lib/components/Toc.svelte
+++ b/src/lib/components/Toc.svelte
@@ -4,17 +4,88 @@
 	import List from 'lucide-svelte/icons/list'
 	import '$lib/components/Card.css'
 	import Backdrop from '$lib/components/Backdrop.svelte'
+	import { onMount } from 'svelte'
 
 	let desktop: boolean | undefined
 	let open: boolean | undefined
 	let headings: HTMLHeadingElement[] | undefined
+	let sidebarTop = 16 // Initial top offset in rem (below banner)
+
+	// Track scroll to adjust sidebar position
+	onMount(() => {
+		const bannerHeight = 275 // Scroll distance in pixels for full transition (higher = slower)
+		const minTop = 1 // Minimum top value in rem when scrolled past banner
+		const maxTop = 16 // Maximum top value in rem when at page top
+
+		function handleScroll() {
+			const scrollY = window.scrollY
+			// Calculate top value based on scroll position
+			// As user scrolls down, reduce the top value
+			const remValue = Math.max(minTop, maxTop - (scrollY / bannerHeight) * (maxTop - minTop))
+			sidebarTop = remValue
+		}
+
+		window.addEventListener('scroll', handleScroll, { passive: true })
+		handleScroll() // Initial call
+
+		return () => {
+			window.removeEventListener('scroll', handleScroll)
+		}
+	})
+
+	function autoScroll(node: HTMLElement) {
+		const observer = new MutationObserver((mutations) => {
+			for (const mutation of mutations) {
+				if (mutation.type === 'attributes' && mutation.attributeName === 'class') {
+					const target = mutation.target as HTMLElement
+					if (target.classList.contains('active')) {
+						target.scrollIntoView({ block: 'center', behavior: 'smooth' })
+					}
+				}
+			}
+		})
+
+		observer.observe(node, {
+			attributes: true,
+			subtree: true,
+			attributeFilter: ['class']
+		})
+
+		return {
+			destroy() {
+				observer.disconnect()
+			}
+		}
+	}
 </script>
 
+<!-- Mobile: Backdrop for popup -->
 <Backdrop {open} />
-<div class="toc-wrapper card" style={desktop ? 'display: none;' : ''}>
+
+<!-- Desktop: Fixed sidebar on the left -->
+{#if desktop}
+	<div class="desktop-toc-wrapper" style="top: {sidebarTop}rem;" use:autoScroll>
+		<Toc
+			headingSelector=":is(h2, h3, h4):not(.toc-exclude):not(footer *)"
+			title="Contents"
+			bind:headings
+			hide={(headings?.length ?? 0) <= 2}
+			open={true}
+			desktop={true}
+		>
+			<svelte:fragment slot="title">
+				<h2 class="toc-title-heading toc-exclude">Contents</h2>
+			</svelte:fragment>
+		</Toc>
+	</div>
+{/if}
+
+<!-- Mobile: Floating button with popup (hidden on desktop) -->
+<div class="toc-wrapper card" class:hidden-on-desktop={desktop}>
 	<Toc
 		headingSelector=":is(h2, h3, h4):not(.toc-exclude):not(footer *)"
 		title="Contents"
+		breakpoint={1250}
 		bind:open
 		bind:desktop
 		bind:headings
@@ -40,16 +111,82 @@
 
 <style>
 	:root {
-		--toc-active-color: var(--bg);
+		--toc-active-color: var(--brand);
 		--toc-li-hover-color: var(--brand);
 		--toc-li-color: var(--text);
 		--toc-mobile-bg: var(--bg);
-		--toc-active-bg: var(--brand);
+		--toc-active-bg: transparent;
 		--toc-max-height: 80vh;
 		--toc-padding: 0em 1em 1em;
 		--toc-z-index: 10;
 	}
 
+	/* Desktop sidebar: fixed on left */
+	.desktop-toc-wrapper {
+		position: fixed;
+		/* top is set dynamically via inline style */
+		width: 220px;
+		max-height: calc(100vh - 3rem); /* Extend nearly to bottom of viewport */
+		overflow-y: auto;
+		background-color: transparent;
+		z-index: 5;
+		padding: 1rem;
+		font-size: 0.85rem;
+
+		/* Hide scrollbar but allow scrolling */
+		scrollbar-width: none; /* Firefox */
+		-ms-overflow-style: none; /* IE and Edge */
+	}
+
+	.desktop-toc-wrapper::-webkit-scrollbar {
+		display: none; /* Chrome, Safari, Opera */
+	}
+
+	.desktop-toc-wrapper :global(.toc) {
+		background-color: transparent;
+	}
+
+	.desktop-toc-wrapper :global(.toc > nav) {
+		background-color: transparent;
+	}
+
+	.desktop-toc-wrapper :global(aside.toc > nav > ol) {
+		padding-left: 0;
+	}
+
+	.desktop-toc-wrapper :global(aside.toc > nav > ol > li) {
+		margin-bottom: 0.5rem;
+	}
+
+	/* Hide open button on desktop ToC */
+	.desktop-toc-wrapper :global(button.toc-icon) {
+		display: none;
+	}
+
+	/* Hide the arrows/navigation bar */
+	.desktop-toc-wrapper :global(.toc-title),
+	.desktop-toc-wrapper :global(.toc-nav),
+	.desktop-toc-wrapper :global(.toc-header) {
+		display: none !important;
+	}
+
+	/* Hide all buttons in desktop sidebar */
+	.desktop-toc-wrapper :global(button) {
+		display: none !important;
+	}
+
+	/* Remove inner scrollbar - only wrapper should scroll */
+	.desktop-toc-wrapper :global(nav) {
+		max-height: none;
+		overflow: visible;
+	}
+
+	/* Hide mobile wrapper on desktop */
+	.hidden-on-desktop {
+		display: none;
+	}
+
+	/* Mobile styles */
 	.toc-head {
 		position: sticky;
 		top: 0;
@@ -87,6 +224,8 @@
 
 	.toc-wrapper :global(.toc > nav) {
 		background-color: inherit;
+		border-radius: inherit;
+		box-shadow: inherit;
 	}
 
 	@media (hover: none) {
@@ -99,6 +238,9 @@
 		.toc-wrapper :global(aside.toc > nav > ol > li:hover) {
 			text-decoration-line: underline;
 		}
+		.desktop-toc-wrapper :global(aside.toc > nav > ol > li:hover) {
+			text-decoration-line: underline;
+		}
 		.toc-close:hover {
 			color: var(--brand);
 		}
diff --git a/src/posts/action.md b/src/posts/action.md
index 4a7e89c75..e432c82a0 100644
--- a/src/posts/action.md
+++ b/src/posts/action.md
@@ -41,7 +41,7 @@ Choose an activity below depending on your interests or skills.
 title: 'Journalist or Creator',
 content: `
 
-<h3>If you work as a journalist or have a social media following</h3>
+<h3 class="toc-exclude">If you work as a journalist or have a social media following</h3>
 <ul>
 <li><strong>Create content</strong> about AI dangers or PauseAI. For more information, reach out to us through any of our <a href="/faq#do-you-have-social-media">communication channels</a>.</li>
 </ul>
@@ -50,7 +50,7 @@ content: `
 	{
 		title: 'Politician or Public Servant',
 		content: `
-<h3>If you are a politician or work in government</h3>
+<h3 class="toc-exclude">If you are a politician or work in government</h3>
 <ul>
 <li><strong>Prepare for the next <a href="/summit">AI safety summit</a></strong>. Form coalitions with other countries to share safety information and act quickly when harms arise. Work towards a global treaty.</li>
 <li><strong>Invite (or subpoena) AI lab leaders</strong> to parliamentary/congressional hearings to give their predictions and timelines of AI disasters.</li>
@@ -63,7 +63,7 @@ content: `
 	{
 		title: 'Legal or Policy Expert',
 		content: `
-<h3>If you have experience with (international) law</h3>
+<h3 class="toc-exclude">If you have experience with (international) law</h3>
 <ul>
 <li><strong>Help draft policy</strong>. <a href="https://www.campaignforaisafety.org/celebrating-the-winners-law-student-moratorium-treaty-competition/">Draft examples</a>. <a href="https://futureoflife.org/wp-content/uploads/2023/04/FLI_Policymaking_In_The_Pause.pdf">Some</a> <a href="https://www.openphilanthropy.org/research/12-tentative-ideas-for-us-ai-policy/">frameworks</a>.</li>
 <li><strong>Make submissions</strong> to government requests for comment on AI policy (<a href="https://ntia.gov/issues/artificial-intelligence/request-for-comments">example</a>).</li>
@@ -73,7 +73,7 @@ content: `
 	{
 		title: 'Academic or Educator',
 		content: `
-<h3>If you are a university professor or work in an academic institution</h3>
+<h3 class="toc-exclude">If you are a university professor or work in an academic institution</h3>
 <ul>
 <li><strong>Write op-eds</strong> and articles for media outlets</li>
 <li><strong>Mentor students</strong> who are interested in this topic</li>
@@ -85,7 +85,7 @@ content: `
 	{
 		title: 'AI Industry Professional',
 		content: `
-<h3>If you work in AI</h3>
+<h3 class="toc-exclude">If you work in AI</h3>
 <ul>
 <li><strong>Don't work towards better AI</strong>: Do not work for AI companies or capabilities research. And do not spread ideas on how we can make AI systems faster or smarter.</li>
 <li><strong>Talk to your management and colleagues</strong> about the risks. Get them to take an institutional position toward mitigating risk over profit. Encourage implementation of standard risk mitigation procedures and anonymous reporting.</li>
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index 72550910a..86d84f35d 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -36,7 +36,7 @@
 <PreloadFonts urls={[robotoSlabLatin300, sairaCondensedLatin700]} />
 
 <h2 style="width: 0; height: 0; margin: 0; padding: 0; visibility: hidden;" data-pagefind-ignore>
-	(Top)
+	Top
 </h2>
 
 <!-- Make sure we only show one banner at a time-->
diff --git a/src/styles/styles.css b/src/styles/styles.css
index a08c35d4a..b8d81163f 100644
--- a/src/styles/styles.css
+++ b/src/styles/styles.css
@@ -110,6 +110,7 @@ h5 {
 	font-family: var(--font-heading);
 	font-weight: 700;
 	line-height: 1em;
+	scroll-margin-top: 3rem;
 }
 
 h1 {