diff --git a/apps/site/src/components/Avatar.astro b/apps/site/src/components/Avatar.astro
index 7a1df277c..3b5e89c6f 100644
--- a/apps/site/src/components/Avatar.astro
+++ b/apps/site/src/components/Avatar.astro
@@ -20,10 +20,11 @@ const {
 	height = 48,
 } = Astro.props;
 
-const src = Astro.locals.sanity
-	.urlForImage(coverImage ?? undefined)
-	?.width(width)
-	.height(height)
+const builder = Astro.locals.sanity.urlForImage(coverImage ?? undefined);
+const src = builder
+	?.width(width * 2)
+	.height(height * 2)
+	.quality(82)
 	.url();
 
 // stegaClean: href is an attribute; zero-width characters break the URL.
diff --git a/apps/site/src/components/ContentCard.astro b/apps/site/src/components/ContentCard.astro
index cfe4e8ee1..066f5e4df 100644
--- a/apps/site/src/components/ContentCard.astro
+++ b/apps/site/src/components/ContentCard.astro
@@ -28,8 +28,9 @@ const people = [
 					<CoverImage
 						image={item.coverImage}
 						fallbackAlt={item.title || "CodingCat.dev author photo"}
-						width={256}
-						height={256}
+						width={640}
+						height={640}
+						sizes="(max-width: 768px) 100vw, 560px"
 						class="w-full h-auto aspect-square rounded-md object-cover"
 						priority={priority}
 					/>
@@ -37,6 +38,7 @@ const people = [
 					<CoverImage
 						image={item.coverImage}
 						fallbackAlt={item.title || "CodingCat.dev tutorial cover image"}
+						sizes="(max-width: 768px) 100vw, 560px"
 						priority={priority}
 					/>
 				)}
diff --git a/apps/site/src/components/CoverImage.astro b/apps/site/src/components/CoverImage.astro
index 75c875a9e..943e32ced 100644
--- a/apps/site/src/components/CoverImage.astro
+++ b/apps/site/src/components/CoverImage.astro
@@ -8,6 +8,7 @@ interface Props {
 	width?: number;
 	height?: number;
 	quality?: number;
+	sizes?: string;
 	/** Above-the-fold images opt out of lazy loading. */
 	priority?: boolean;
 	class?: string;
@@ -18,18 +19,37 @@ const {
 	fallbackAlt = "CodingCat.dev tutorial cover image",
 	width = 1920,
 	height = 1080,
-	quality = 80,
+	quality = 82,
+	sizes = "(max-width: 768px) 100vw, (max-width: 1280px) 50vw, 960px",
 	priority = false,
 	class: className = "w-full h-auto aspect-video rounded-md",
 } = Astro.props;
 
-const src = Astro.locals.sanity
-	.urlForImage(image ?? undefined)
+const builder = Astro.locals.sanity.urlForImage(image ?? undefined);
+const aspect = height / width;
+
+const src = builder
 	?.width(width)
 	.height(height)
 	.quality(quality)
 	.url();
 
+const responsiveWidths = [320, 480, 640, 960, 1280, 1600, 1920].filter(
+	(w) => w <= width,
+);
+if (!responsiveWidths.includes(width)) {
+	responsiveWidths.push(width);
+}
+const srcset = builder
+	? responsiveWidths
+			.map((w) => {
+				const h = Math.round(w * aspect);
+				const u = builder.width(w).height(h).quality(quality).url();
+				return `${u} ${w}w`;
+			})
+			.join(", ")
+	: undefined;
+
 // stegaClean: alt lands in an attribute, where stega's zero-width characters
 // would be read out verbatim by screen readers.
 const rawAlt = stegaClean((image as { alt?: string } | null)?.alt);
@@ -42,13 +62,14 @@ const alt = rawAlt && rawAlt.trim().length > 0 ? rawAlt : fallbackAlt;
 			<img
 				class={className}
 				src={src}
+				srcset={srcset}
 				width={width}
 				height={height}
 				alt={alt}
 				loading={priority ? "eager" : "lazy"}
 				fetchpriority={priority ? "high" : "auto"}
 				decoding={priority ? "sync" : "async"}
-				sizes="(max-width: 768px) 100vw, (max-width: 1200px) 50vw, 33vw"
+				sizes={sizes}
 			/>
 		) : (
 			<div class="bg-muted rounded-md" style="padding-top: 50%" />
diff --git a/apps/site/src/components/CoverMedia.astro b/apps/site/src/components/CoverMedia.astro
index f31bc3bd2..01315f2a6 100644
--- a/apps/site/src/components/CoverMedia.astro
+++ b/apps/site/src/components/CoverMedia.astro
@@ -54,8 +54,14 @@ const youtubeUrl = stegaClean(youtube);
 			</video>
 		</div>
 	) : youtubeUrl ? (
-		<PtYouTube node={{ _type: "youtube", youtube: youtubeUrl }} index={0} isInline={false} />
+		<PtYouTube
+			node={{ _type: "youtube", youtube: youtubeUrl }}
+			coverImage={image}
+			priority
+			index={0}
+			isInline={false}
+		/>
 	) : (
-		<CoverImage image={image} priority class={className} />
+		<CoverImage image={image} priority sizes="(max-width: 1280px) 100vw, 1280px" class={className} />
 	)
 }
diff --git a/apps/site/src/components/HomeSection.astro b/apps/site/src/components/HomeSection.astro
index f63ad522f..15b39da2e 100644
--- a/apps/site/src/components/HomeSection.astro
+++ b/apps/site/src/components/HomeSection.astro
@@ -43,8 +43,9 @@ const { title, description, items, muted = false } = Astro.props;
 									<CoverImage
 										image={item.coverImage}
 										fallbackAlt={item.title || "CodingCat.dev tutorial cover image"}
-										width={320}
-										height={180}
+										width={960}
+										height={540}
+										sizes="(max-width: 1024px) 100vw, 512px"
 										class="aspect-video w-full object-cover object-center"
 									/>
 								)}
diff --git a/apps/site/src/components/portable-text/PtYouTube.astro b/apps/site/src/components/portable-text/PtYouTube.astro
index 2c0a504c7..fabdb3175 100644
--- a/apps/site/src/components/portable-text/PtYouTube.astro
+++ b/apps/site/src/components/portable-text/PtYouTube.astro
@@ -1,39 +1,74 @@
 ---
 import { stegaClean } from "@sanity/client/stega";
+import type { SanityImageSource } from "@sanity/image-url";
 import type { Props as PtProps } from "astro-portabletext/types";
 import { youtubeId } from "@/lib/youtube";
 
 type YouTubeNode = { _type: "youtube"; youtube?: string };
 
-type Props = PtProps<YouTubeNode>;
+type Props = PtProps<YouTubeNode> & {
+	coverImage?: (SanityImageSource & { alt?: string }) | null;
+	priority?: boolean;
+};
 
-const { node } = Astro.props;
+const { node, coverImage, priority = false } = Astro.props;
 const id = youtubeId(stegaClean(node.youtube));
+
+const builder = Astro.locals.sanity.urlForImage(coverImage ?? undefined);
+const sanitySrc = builder?.width(1920).height(1080).quality(82).url();
+const sanitySrcset = builder
+	? [480, 640, 960, 1280, 1600, 1920]
+			.map((w) => {
+				const h = Math.round((w * 9) / 16);
+				return `${builder.width(w).height(h).quality(82).url()} ${w}w`;
+			})
+			.join(", ")
+	: undefined;
+const rawAlt = stegaClean((coverImage as { alt?: string } | null)?.alt);
+const alt = rawAlt && rawAlt.trim().length > 0 ? rawAlt : "";
 ---
 
 {
 	id && (
 		<div class="not-prose my-6">
 			<div class="yt-embed relative aspect-video isolate overflow-hidden rounded-md" data-yt={id}>
-				<picture>
-					<source
-						type="image/webp"
-						srcset={[
-							`https://i.ytimg.com/vi_webp/${id}/mqdefault.webp 320w`,
-							`https://i.ytimg.com/vi_webp/${id}/hqdefault.webp 480w`,
-							`https://i.ytimg.com/vi_webp/${id}/sddefault.webp 640w`,
-						].join(", ")}
-					/>
+				{sanitySrc ? (
 					<img
 						class="size-full object-cover"
-						src={`https://i.ytimg.com/vi/${id}/sddefault.jpg`}
-						alt=""
-						width={640}
-						height={480}
-						loading="lazy"
-						decoding="async"
+						src={sanitySrc}
+						srcset={sanitySrcset}
+						sizes="(max-width: 1280px) 100vw, 1280px"
+						alt={alt}
+						width={1920}
+						height={1080}
+						loading={priority ? "eager" : "lazy"}
+						fetchpriority={priority ? "high" : "auto"}
+						decoding={priority ? "sync" : "async"}
 					/>
-				</picture>
+				) : (
+					<picture>
+						<source
+							type="image/webp"
+							sizes="(max-width: 1280px) 100vw, 1280px"
+							srcset={[
+								`https://i.ytimg.com/vi_webp/${id}/mqdefault.webp 320w`,
+								`https://i.ytimg.com/vi_webp/${id}/hqdefault.webp 480w`,
+								`https://i.ytimg.com/vi_webp/${id}/sddefault.webp 640w`,
+								`https://i.ytimg.com/vi_webp/${id}/maxresdefault.webp 1280w`,
+							].join(", ")}
+						/>
+						<img
+							class="size-full object-cover"
+							src={`https://i.ytimg.com/vi/${id}/maxresdefault.jpg`}
+							alt=""
+							width={1280}
+							height={720}
+							loading={priority ? "eager" : "lazy"}
+							fetchpriority={priority ? "high" : "auto"}
+							decoding={priority ? "sync" : "async"}
+						/>
+					</picture>
+				)}
 				<button
 					type="button"
 					class="absolute inset-0 grid size-full place-items-center border-0 bg-transparent"
diff --git a/apps/site/src/pages/api/guest-portal/update.ts b/apps/site/src/pages/api/guest-portal/update.ts
index 33479a759..5d814619d 100644
--- a/apps/site/src/pages/api/guest-portal/update.ts
+++ b/apps/site/src/pages/api/guest-portal/update.ts
@@ -59,12 +59,13 @@ export const POST: APIRoute = async ({ request }) => {
 
 		const existingGuest = await client.fetch<{
 			_id: string;
+			_type: string;
 			title?: string;
 			socials?: Record<string, string>;
 			websites?: Array<any>;
 		} | null>(
-			`*[_type == "guest" && _id == $id][0]{ _id, title, socials, websites }`,
-			{ id: guestId },
+			`*[_type in ["guest", "author"] && (_id == $id || slug.current == $slug)][0]{ _id, _type, title, socials, websites }`,
+			{ id: guestId, slug: verification.payload?.slug || "" },
 		);
 
 		if (!existingGuest) {
diff --git a/apps/site/src/pages/guest-portal/[token].astro b/apps/site/src/pages/guest-portal/[token].astro
index aaafcea8c..946c69e17 100644
--- a/apps/site/src/pages/guest-portal/[token].astro
+++ b/apps/site/src/pages/guest-portal/[token].astro
@@ -20,6 +20,7 @@ interface EpisodeRef {
 
 interface GuestDoc {
 	_id: string;
+	_type: "guest" | "author";
 	title: string;
 	slug: string;
 	avatarUrl?: string;
@@ -42,8 +43,9 @@ let guestDoc: GuestDoc | null = null;
 
 if (isValid && verification.payload) {
 	guestDoc = await client.fetch<GuestDoc | null>(
-		`*[_type == "guest" && (_id == $id || slug.current == $slug)][0]{
+		`*[_type in ["guest", "author"] && (_id == $id || slug.current == $slug)][0]{
 			_id,
+			_type,
 			title,
 			"slug": slug.current,
 			"avatarUrl": coverImage.asset->url,
@@ -51,7 +53,7 @@ if (isValid && verification.payload) {
 			content,
 			socials,
 			websites,
-			"episodes": *[_type == "podcast" && references(^._id) && !(_id in path("drafts.**"))] | order(season desc, episode desc) {
+			"episodes": *[_type == "podcast" && references(^._id) && !(_id in path("drafts.**"))] | order(season desc, episode desc) [0...10] {
 				_id,
 				title,
 				"slug": slug.current,
@@ -64,6 +66,8 @@ if (isValid && verification.payload) {
 	);
 }
 
+const isAuthor = guestDoc?._type === "author";
+const profilePathPrefix = isAuthor ? "author" : "guest";
 const socials = guestDoc?.socials || {};
 const primaryWebsite =
 	guestDoc?.websites?.[0]?.link?.href || guestDoc?.websites?.[0]?.site || "";
@@ -168,8 +172,11 @@ const socialFields = [
 	<div class="mx-auto max-w-4xl px-4 py-10 sm:px-6 lg:px-8">
 		<Breadcrumbs
 			links={[
-				{ title: "Guests", href: "/guests" },
-				{ title: guestDoc?.title || "Guest Portal" },
+				{
+					title: isAuthor ? "Authors" : "Guests",
+					href: isAuthor ? "/authors/page/1" : "/guests/page/1",
+				},
+				{ title: guestDoc?.title || "Profile Portal" },
 			]}
 		/>
 
@@ -212,14 +219,14 @@ const socialFields = [
 									{guestDoc.title}
 								</h1>
 								<p class="text-sm text-muted-foreground">
-									Public Speaker Profile:{" "}
+									Public {isAuthor ? "Author" : "Speaker"} Profile:{" "}
 									<a
-										href={`/guest/${guestDoc.slug}`}
+										href={`/${profilePathPrefix}/${guestDoc.slug}`}
 										target="_blank"
 										rel="noreferrer"
 										class="font-medium text-primary underline"
 									>
-										codingcat.dev/guest/{guestDoc.slug}
+										codingcat.dev/{profilePathPrefix}/{guestDoc.slug}
 									</a>
 								</p>
 							</div>