diff --git a/src/components/ContactForm.astro b/src/components/ContactForm.astro
index 9c3cf70..ff6741a 100644
--- a/src/components/ContactForm.astro
+++ b/src/components/ContactForm.astro
@@ -1,7 +1,11 @@
 ---
 import { Icon } from "astro-icon/components";
 
-const ID = `contact-form-${Math.random().toString(36)}`;
+interface Props {
+  id?: string;
+}
+
+const { id: ID = "contact-form" } = Astro.props;
 ---
 
 <form
@@ -9,60 +13,78 @@ const ID = `contact-form-${Math.random().toString(36)}`;
   id={ID}
 >
   <div>
-    <label for="name" class="block font-bold">Name</label>
+    <label for={`${ID}-name`} class="block font-bold">Name</label>
     <input
       type="text"
-      id="name"
+      id={`${ID}-name`}
       name="name"
       required
+      autocomplete="name"
+      maxlength="100"
       class="mt-2 block w-full rounded p-2 shadow dark:bg-gray-600"
     />
   </div>
   <div>
-    <label for="email" class="block font-bold">Your email</label>
+    <label for={`${ID}-email`} class="block font-bold">Your email</label>
     <input
       type="email"
-      id="email"
+      id={`${ID}-email`}
       name="email"
       required
+      autocomplete="email"
+      maxlength="254"
       class="mt-2 block w-full rounded p-2 shadow dark:bg-gray-600"
     />
   </div>
   <div>
-    <label for="subject" class="block font-bold">Subject</label>
+    <label for={`${ID}-subject`} class="block font-bold">Subject</label>
     <input
       type="text"
-      id="subject"
+      id={`${ID}-subject`}
       name="subject"
+      required
+      maxlength="150"
       class="mt-2 block w-full rounded p-2 shadow dark:bg-gray-600"
     />
   </div>
   <div>
-    <label for="message" class="block font-bold">Message</label>
+    <label for={`${ID}-message`} class="block font-bold">Message</label>
     <textarea
-      id="message"
+      id={`${ID}-message`}
       name="message"
       rows="4"
+      required
+      maxlength="5000"
       class="mt-2 block w-full rounded p-2 shadow dark:bg-gray-600"></textarea>
   </div>
   <button
-    id="submit"
+    id={`${ID}-submit`}
     type="submit"
-    class="bg-primary text-md font-header hover:text-primary repeat hover:ring-primary mx-auto inline-block rounded px-6 py-3 font-light text-white uppercase drop-shadow transition hover:bg-white hover:ring-2"
+    class="bg-primary text-md font-header hover:text-primary hover:ring-primary mx-auto inline-block rounded px-6 py-3 font-light text-white uppercase drop-shadow transition hover:bg-white hover:ring-2"
     ><Icon
       name="mdi:loading"
-      id="loading-icon"
+      id={`${ID}-loading-icon`}
       class="mr-4 hidden animate-spin"
-    /><span id="response-message" class="inline">Send message</span></button
+    /><span
+      id={`${ID}-response-message`}
+      class="inline"
+      role="status"
+      aria-live="polite">Send message</span
+    ></button
   >
 </form>
 
 <script define:vars={{ ID }}>
   function init() {
     const form = document.getElementById(ID);
-    const responseMsg = form.querySelector("#response-message");
-    const button = form.querySelector("#submit");
-    const loadingIcon = form.querySelector("#loading-icon");
+    if (!form) return;
+    const responseMsg = form.querySelector(
+      `#${CSS.escape(ID + "-response-message")}`
+    );
+    const button = form.querySelector(`#${CSS.escape(ID + "-submit")}`);
+    const loadingIcon = form.querySelector(
+      `#${CSS.escape(ID + "-loading-icon")}`
+    );
 
     form.addEventListener("submit", async function (event) {
       event.preventDefault();
diff --git a/src/components/HeroImageNative.astro b/src/components/HeroImageNative.astro
index afb218e..6f6a802 100644
--- a/src/components/HeroImageNative.astro
+++ b/src/components/HeroImageNative.astro
@@ -16,16 +16,19 @@ const imagesArray = await Promise.all(
 <div class="absolute -z-50 h-full w-full bg-black"></div>
 <img
   src={imagesArray[0].default.src}
+  alt=""
   class:list={[
-    "object-no-repeat absolute -z-50 h-full w-full object-cover object-center transition duration-2000",
+    "absolute -z-50 h-full w-full object-cover object-center transition duration-2000",
     transitionStyle
   ]}
   id="hero-image-1"
 />
 <img
   src={imagesArray[1].default.src}
+  alt=""
+  aria-hidden="true"
   class:list={[
-    "object-no-repeat absolute -z-50 h-full w-full object-cover object-center transition duration-2000",
+    "absolute -z-50 h-full w-full object-cover object-center transition duration-2000",
     transitionStyle
   ]}
   id="hero-image-2"
diff --git a/src/components/Navbar.astro b/src/components/Navbar.astro
index d5a810e..306deaf 100644
--- a/src/components/Navbar.astro
+++ b/src/components/Navbar.astro
@@ -62,7 +62,13 @@ const { navbarDisplay = "normal" } = Astro.props as Props;
 
       <!-- Mobile Menu Button -->
       <div class="md:hidden">
-        <button id="menu-toggle" class="text-2xl focus:outline-none">
+        <button
+          id="menu-toggle"
+          class="text-2xl focus:outline-none"
+          aria-label="Toggle navigation menu"
+          aria-expanded="false"
+          aria-controls="mobile-menu"
+        >
           ☰
         </button>
       </div>
@@ -100,10 +106,7 @@ const { navbarDisplay = "normal" } = Astro.props as Props;
 
 <!-- Extra spacing for non-transparent navbar  -->
 <div
-  class:list={[
-    "y-0 r-0 h-12",
-    navbarDisplay === "transparent" ? "hidden" : "block"
-  ]}
+  class:list={["h-12", navbarDisplay === "transparent" ? "hidden" : "block"]}
 >
 </div>
 
@@ -141,12 +144,23 @@ const { navbarDisplay = "normal" } = Astro.props as Props;
         if (nav) {
           const visible = nav.getAttribute("data-mobile-menu") === "visible";
           nav.setAttribute("data-mobile-menu", visible ? "hidden" : "visible");
+          toggle.setAttribute("aria-expanded", visible ? "false" : "true");
         }
 
         checkScroll();
       });
     }
 
+    document.addEventListener("keydown", (e) => {
+      if (
+        e.key === "Escape" &&
+        nav?.getAttribute("data-mobile-menu") === "visible"
+      ) {
+        nav.setAttribute("data-mobile-menu", "hidden");
+        toggle?.setAttribute("aria-expanded", "false");
+      }
+    });
+
     checkScroll();
   });
 
diff --git a/src/components/Player.astro b/src/components/Player.astro
index 6b230ae..904cfd2 100644
--- a/src/components/Player.astro
+++ b/src/components/Player.astro
@@ -399,7 +399,10 @@ const playerArtworkOpacity = 0.4;
 
       this.UI.progress.bar.addEventListener("click", function (event) {
         event.stopPropagation();
-        window.player.seek(event.clientX / window.innerWidth);
+        const rect = this.getBoundingClientRect();
+        const per =
+          rect.width > 0 ? (event.clientX - rect.left) / rect.width : 0;
+        window.player.seek(Math.min(Math.max(per, 0), 1));
       });
 
       // Tap the circle to expand (not the play button).
@@ -578,8 +581,9 @@ const playerArtworkOpacity = 0.4;
      */
     pause() {
       // Get the Howl we want to manipulate.
-      var sound = this.playlist[this.index].howl;
+      var sound = this.playlist[this.index]?.howl;
 
+      if (!sound) return;
       sound.pause();
 
       this.syncPlayPauseUI(false);
diff --git a/src/components/SEO.astro b/src/components/SEO.astro
index 4449ef0..c738bec 100644
--- a/src/components/SEO.astro
+++ b/src/components/SEO.astro
@@ -16,7 +16,7 @@ import { Schema } from "astro-seo-schema";
 
 <!-- SEO -->
 <link rel="canonical" href={url} />
-<meta name="robots" content="all" />
+<meta name="robots" content="index, follow" />
 <Schema
   item={{
     "@context": "https://schema.org",
@@ -86,8 +86,11 @@ import { Schema } from "astro-seo-schema";
 />
 <meta property="og:image:alt" content={image?.alt || site.image.alt} />
 <meta property="og:image:type" content="image/jpeg" />
-<meta property="og:image:width" content={image?.width.toString() || "1920"} />
-<meta property="og:image:height" content={image?.height.toString() || "1080"} />
+<meta property="og:image:width" content={image?.width?.toString() || "1920"} />
+<meta
+  property="og:image:height"
+  content={image?.height?.toString() || "1080"}
+/>
 
 <!-- Twitter -->
 <meta name="twitter:site" content="@nathancummins.au" />
@@ -100,8 +103,8 @@ import { Schema } from "astro-seo-schema";
     ? image.externalURL
     : site.image.externalURL}
 />
-<meta name="twitter:image:alt" content={title} />
-<meta name="twitter:domain" content={import.meta.env.SITE} />
-
-<!-- Theming -->
-<meta name="theme-color" content="#ff2d00" />
+<meta name="twitter:image:alt" content={image?.alt || site.image.alt} />
+<meta
+  name="twitter:domain"
+  content={import.meta.env.SITE ?? "www.nathancummins.com.au"}
+/>
diff --git a/src/components/SectionTitle.astro b/src/components/SectionTitle.astro
index 2a688ba..688e124 100644
--- a/src/components/SectionTitle.astro
+++ b/src/components/SectionTitle.astro
@@ -7,7 +7,7 @@ interface Props {
 }
 
 const {
-  Tag = "h1",
+  Tag = "h2",
   lineColour = "border-primary",
   lineColourDark = "dark:text-primary",
   class: className
diff --git a/src/components/TextLink.astro b/src/components/TextLink.astro
index 34f0ece..449aaa3 100644
--- a/src/components/TextLink.astro
+++ b/src/components/TextLink.astro
@@ -26,13 +26,13 @@ const linkIsExternal: boolean =
   target={href?.toString().startsWith("http") ? "_blank" : undefined}
   rel={linkIsExternal ? "noopener noreferrer" : undefined}
   {...attrs}
-  ><span class="group-hover:text-primary-100"><slot /></span>{
+  ><span class="group-hover:text-primary-600"><slot /></span>{
     includeExternalLinkIcon && linkIsExternal && (
       <sup class="ml-0.5 inline-block">
         <Icon
           name="mdi:external-link"
           class:list={[
-            "text-primary group-hover:text-primary-100 m-0 inline-block"
+            "text-primary group-hover:text-primary-600 m-0 inline-block"
           ]}
         />
       </sup>
diff --git a/src/components/ThemeSwitcher.astro b/src/components/ThemeSwitcher.astro
index b3781ef..037f879 100644
--- a/src/components/ThemeSwitcher.astro
+++ b/src/components/ThemeSwitcher.astro
@@ -2,9 +2,11 @@
 import { Icon } from "astro-icon/components";
 ---
 
-<span
-  class="theme:switcher flex justify-center text-center align-middle text-2xl"
+<button
+  type="button"
+  class="theme:switcher mx-auto flex w-full justify-center text-center align-middle text-2xl"
   onclick="toggleTheme()"
+  aria-label="Toggle colour theme"
 >
   <span class="theme:light-mode">
     <Icon name="fa7-solid:sun" />
@@ -12,7 +14,7 @@ import { Icon } from "astro-icon/components";
   <span class="theme:dark-mode">
     <Icon name="fa7-solid:moon" />
   </span>
-</span>
+</button>
 
 <script is:inline>
   function updateThemeIconAndAriaLabel(
diff --git a/src/data/site.ts b/src/data/site.ts
index 04c0f6b..8cbaa96 100644
--- a/src/data/site.ts
+++ b/src/data/site.ts
@@ -8,6 +8,6 @@ export default {
   image: {
     externalURL: `${import.meta.env.SITE}/nathan-cummins-composer-orchestrator-conductor.jpg`,
     src: "nathan-cummins-composer-orchestrator-conductor.jpg",
-    alt: "Nathan Cummins"
+    alt: "Picture of Nathan Cummins, Adelaide composer, orchestrator, and conductor"
   } as SiteImage
 };
diff --git a/src/env.d.ts b/src/env.d.ts
index 2979382..7968e2a 100644
--- a/src/env.d.ts
+++ b/src/env.d.ts
@@ -14,6 +14,7 @@ interface Window {
 }
 
 interface ImportMetaEnv {
+  readonly SITE?: string;
   readonly EMAIL_USER: string;
   readonly EMAIL_PASS: string;
   readonly EMAIL_PORT: number;
diff --git a/src/lib/utils.ts b/src/lib/utils.ts
index f9d0dd6..41310aa 100644
--- a/src/lib/utils.ts
+++ b/src/lib/utils.ts
@@ -17,7 +17,7 @@ const allProjectHeros = import.meta.glob<{ default: ImageMetadata }>(
 );
 
 const allImages = import.meta.glob<{ default: ImageMetadata }>(
-  "/**/*.{jpeg,jpg,png,gif}",
+  "/src/assets/**/*.{jpeg,jpg,png,gif}",
   {
     eager: true
   }
@@ -82,11 +82,12 @@ export function getAllProjectImages(project: Project): ImageMetadata[] {
 }
 
 export function shuffleArray<T>(array: Array<T>): Array<T> {
-  for (let i = array.length - 1; i > 0; i--) {
+  const copy = [...array];
+  for (let i = copy.length - 1; i > 0; i--) {
     const j = Math.floor(Math.random() * (i + 1));
-    [array[i], array[j]] = [array[j], array[i]];
+    [copy[i], copy[j]] = [copy[j], copy[i]];
   }
-  return array;
+  return copy;
 }
 
 export async function convertEagerImagesImportGlobToArray(
diff --git a/src/pages/404.astro b/src/pages/404.astro
index 642571b..f9c52e9 100644
--- a/src/pages/404.astro
+++ b/src/pages/404.astro
@@ -17,27 +17,26 @@ const heroImagesArray = await convertEagerImagesImportGlobToArray(heroImages);
       images={heroImagesArray}
       class="h-full w-full"
       foreground={true}
-      foreground={true}
       foregroundOpacity="opacity-80"
     />
   </div>
   <div
     class="absolute inset-0 flex h-full w-full flex-col justify-center px-8 py-36 text-center"
   >
-    <h1
+    <p
       class="font-header pb-8 text-5xl font-medium text-white uppercase text-shadow-lg/75 md:text-7xl lg:text-9xl"
     >
       Oops!
-    </h1>
-    <h2
+    </p>
+    <h1
       class="font-header text-2xl font-medium text-gray-300 uppercase text-shadow-lg/75 md:text-2xl lg:text-4xl"
     >
       404 - Page not found
-    </h2>
+    </h1>
 
     <a
       href="/"
-      class="bg-primary text-md font-header hover:text-primary repeat hover:ring-primary mx-auto mt-8 inline-block rounded px-6 py-3 font-light text-white uppercase drop-shadow-lg/75 transition hover:bg-white hover:ring-2"
+      class="bg-primary text-md font-header hover:text-primary hover:ring-primary mx-auto mt-8 inline-block rounded px-6 py-3 font-light text-white uppercase drop-shadow-lg/75 transition hover:bg-white hover:ring-2"
     >
       Home
     </a>
diff --git a/src/pages/about.astro b/src/pages/about.astro
index 5d1a1dc..af43dbf 100644
--- a/src/pages/about.astro
+++ b/src/pages/about.astro
@@ -22,7 +22,7 @@ import { Image } from "astro:assets";
           class="mx-auto mb-8 size-125 rounded-full object-cover shadow-lg/75 transition ease-in-out md:hover:scale-150"
           height={750}
         />
-        <SectionTitle class="py-8">Dr Nathan Cummins</SectionTitle>
+        <SectionTitle Tag="h1" class="py-8">Dr Nathan Cummins</SectionTitle>
         <H2>{site.tagline}</H2>
         <Paragraph
           >Nathan Cummins is a composer, orchestrator, conductor, and sound
diff --git a/src/pages/contact.astro b/src/pages/contact.astro
index 63db42b..432d24b 100644
--- a/src/pages/contact.astro
+++ b/src/pages/contact.astro
@@ -11,7 +11,7 @@ import { Icon } from "astro-icon/components";
   <div class="w-full">
     <section id="contact" class="bg-primary dark:bg-gray-800">
       <div class="mx-auto max-w-4xl px-8 py-16 text-center">
-        <SectionTitle class="text-white" lineColour="text-white"
+        <SectionTitle Tag="h1" class="text-white" lineColour="text-white"
           >Let's get in touch!</SectionTitle
         >
         <ContactForm />
diff --git a/src/pages/index.astro b/src/pages/index.astro
index 81f99ee..e78fdca 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -78,7 +78,7 @@ const tracks = (
 
       <a
         href="/contact/"
-        class="bg-primary text-md font-header hover:text-primary repeat hover:ring-primary mx-auto mt-8 inline-block rounded px-6 py-3 font-light text-white uppercase drop-shadow-lg/75 transition hover:bg-white hover:ring-2"
+        class="bg-primary text-md font-header hover:text-primary hover:ring-primary mx-auto mt-8 inline-block rounded px-6 py-3 font-light text-white uppercase drop-shadow-lg/75 transition hover:bg-white hover:ring-2"
       >
         Get in touch!
       </a>
@@ -98,7 +98,7 @@ const tracks = (
         <span class="block w-full text-center"
           ><a
             href="/about/"
-            class="bg-primary text-md font-header hover:text-primary repeat hover:ring-primary mx-auto mt-8 inline-block rounded px-6 py-3 font-light text-white uppercase drop-shadow-lg/75 transition hover:bg-white hover:ring-2"
+            class="bg-primary text-md font-header hover:text-primary hover:ring-primary mx-auto mt-8 inline-block rounded px-6 py-3 font-light text-white uppercase drop-shadow-lg/75 transition hover:bg-white hover:ring-2"
           >
             Find out more
           </a></span
@@ -121,7 +121,7 @@ const tracks = (
           ><div class="flex h-full w-full items-center">
             <a
               href="/contact/"
-              class="text-md font-header repeat text-primary hover:bg-primary mx-auto inline-block rounded bg-white px-6 py-3 font-light uppercase drop-shadow-lg/75 transition hover:text-white hover:ring-2 hover:ring-white"
+              class="text-md font-header text-primary hover:bg-primary mx-auto inline-block rounded bg-white px-6 py-3 font-light uppercase drop-shadow-lg/75 transition hover:text-white hover:ring-2 hover:ring-white"
             >
               Get in touch!
             </a>
@@ -150,7 +150,7 @@ const tracks = (
         </div>
         <a
           href="/projects/"
-          class="bg-primary text-md font-header hover:text-primary repeat hover:ring-primary mx-auto mt-8 inline-block rounded px-6 py-3 font-light text-white uppercase drop-shadow-lg/75 transition hover:bg-white hover:ring-2"
+          class="bg-primary text-md font-header hover:text-primary hover:ring-primary mx-auto mt-8 inline-block rounded px-6 py-3 font-light text-white uppercase drop-shadow-lg/75 transition hover:bg-white hover:ring-2"
         >
           Explore more projects
         </a>
diff --git a/src/pages/projects.astro b/src/pages/projects.astro
index 51a03d0..e9454e3 100644
--- a/src/pages/projects.astro
+++ b/src/pages/projects.astro
@@ -20,7 +20,7 @@ const types = [...new Set(projects.map((project) => project.data.type))];
   <div class="w-full">
     <section id="projects" class="bg-white dark:bg-gray-950">
       <div class="mx-auto max-w-4xl px-8 py-16 text-center">
-        <SectionTitle>Recent Projects</SectionTitle>
+        <SectionTitle Tag="h1">Recent Projects</SectionTitle>
         <div id="filter-tokens" class="my-8 space-y-2 space-x-2">
           <Token
             class="filter-token !text-primary ring-primary bg-white ring-2 hover:cursor-pointer"
diff --git a/src/pages/sheet-music.astro b/src/pages/sheet-music.astro
index f914c2b..9e43297 100644
--- a/src/pages/sheet-music.astro
+++ b/src/pages/sheet-music.astro
@@ -11,7 +11,7 @@ import MainLayout from "@layouts/MainLayout.astro";
   <div class="w-full bg-white py-16 dark:bg-gray-950">
     <section id="intro">
       <div class="mx-auto max-w-4xl px-8 text-left">
-        <SectionTitle class="pb-8">Sheet Music</SectionTitle>
+        <SectionTitle Tag="h1" class="pb-8">Sheet Music</SectionTitle>
         <Paragraph
           >Sheet music for many of my pieces and orchestrations is available for
           purchase or rent. If you are interested in sheet music for performance
diff --git a/src/styles/global.css b/src/styles/global.css
index e515f9f..2baa631 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -1,5 +1,4 @@
 @import url("https://fonts.googleapis.com/css2?family=Fira+Code:wght@300..700&display=swap");
-@import url("https://fonts.googleapis.com/css2?family=Fira+Code:wght@300..700&display=swap");
 @import "../../public/fonts/inter/inter.css";
 @import "tailwindcss";
 @custom-variant dark (&:where([data-theme=dark], [data-theme=dark] *));