Update zola.toml to include site title, description, theme, and additional URLs for navigation

frontend/src/components/marquee.tsx

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+const MARQUEE_TEXT =
+  "Every human being deserves free high quality learning materials — Man Lung Yeung";
+
+export function Marquee() {
+  const segment = () => (
+    <span class="marquee-text">
+      {MARQUEE_TEXT}
+      &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+    </span>
+  );
+
+  return (
+    <div class="marquee-shell" role="region" aria-label="Site quote">
+      <div class="marquee-line" />
+      <div class="marquee" aria-hidden="true">
+        <div class="marquee-track">
+          {segment()}
+          {segment()}
+          {segment()}
+        </div>
+      </div>
+      <div class="marquee-line" />
+    </div>
+  );
+}

frontend/src/components/scroll-reveal.tsx

@@ -0,0 +1,35 @@
+import { onCleanup, onMount } from "solid-js";
+
+export function ScrollRevealBootstrap() {
+  onMount(() => {
+    const cards = document.querySelectorAll<HTMLElement>("[data-scroll-reveal-card]");
+    if (!cards.length) return;
+
+    const reducedMotion = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
+    if (reducedMotion) {
+      cards.forEach((card) => card.classList.add("is-inview"));
+      return;
+    }
+
+    const observer = new IntersectionObserver(
+      (entries, obs) => {
+        entries.forEach((entry) => {
+          if (entry.isIntersecting) {
+            entry.target.classList.add("is-inview");
+            obs.unobserve(entry.target);
+          }
+        });
+      },
+      { threshold: 0.14 }
+    );
+
+    cards.forEach((card, index) => {
+      card.style.transitionDelay = `${index * 80}ms`;
+      observer.observe(card);
+    });
+
+    onCleanup(() => observer.disconnect());
+  });
+
+  return null;
+}

frontend/src/components/site-header.tsx

@@ -0,0 +1,94 @@
+import { createSignal, onCleanup, onMount, For } from "solid-js";
+import { ThemeToggle } from "./theme-toggle";
+
+type NavLink = {
+  label: string;
+  href: string;
+};
+
+type SiteHeaderProps = {
+  brand: string;
+  homeUrl: string;
+  links: NavLink[];
+};
+
+export function SiteHeader(props: SiteHeaderProps) {
+  const [scrolled, setScrolled] = createSignal(false);
+  const [navOpen, setNavOpen] = createSignal(false);
+
+  onMount(() => {
+    const onScroll = () => setScrolled(window.scrollY > 24);
+    onScroll();
+    window.addEventListener("scroll", onScroll, { passive: true });
+
+    const onResize = () => {
+      if (window.innerWidth > 467 && navOpen()) {
+        setNavOpen(false);
+        document.body.style.overflow = "";
+      }
+    };
+    window.addEventListener("resize", onResize, { passive: true });
+
+    onCleanup(() => {
+      window.removeEventListener("scroll", onScroll);
+      window.removeEventListener("resize", onResize);
+      document.body.style.overflow = "";
+    });
+  });
+
+  const setOpen = (open: boolean) => {
+    setNavOpen(open);
+    document.body.style.overflow = open ? "hidden" : "";
+  };
+
+  const headerClass = () => {
+    const classes = ["site-header"];
+    if (scrolled()) classes.push("is-scrolled");
+    if (navOpen()) classes.push("nav-is-open");
+    return classes.join(" ");
+  };
+
+  return (
+    <header class={headerClass()}>
+      <div class="container header-row">
+        <div class="brand">
+          <a class="brand-name" href={props.homeUrl}>
+            {props.brand}
+          </a>
+        </div>
+        <div class="header-actions">
+          <nav class="main-nav" aria-label="Primary navigation">
+            <For each={props.links}>{(link) => <a href={link.href}>{link.label}</a>}</For>
+          </nav>
+          <ThemeToggle />
+          <button
+            type="button"
+            class="nav-burger"
+            aria-controls="mobile-nav"
+            aria-expanded={navOpen() ? "true" : "false"}
+            aria-label={navOpen() ? "Close menu" : "Open menu"}
+            onClick={() => setOpen(!navOpen())}
+          >
+            <span class="nav-burger-line" />
+            <span class="nav-burger-line" />
+            <span class="nav-burger-line" />
+          </button>
+        </div>
+      </div>
+      <div
+        class="nav-backdrop"
+        aria-hidden={navOpen() ? "false" : "true"}
+        onClick={() => setOpen(false)}
+      />
+      <nav id="mobile-nav" class="mobile-nav-panel" aria-label="Mobile navigation">
+        <For each={props.links}>
+          {(link) => (
+            <a href={link.href} onClick={() => setOpen(false)}>
+              {link.label}
+            </a>
+          )}
+        </For>
+      </nav>
+    </header>
+  );
+}

frontend/src/components/theme-toggle.tsx

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+import { createSignal, onMount, Show } from "solid-js";
+import { resolveTheme, setTheme, type ThemeChoice } from "../theme";
+
+export function ThemeToggle() {
+  const [theme, setThemeState] = createSignal<ThemeChoice>("light");
+
+  onMount(() => {
+    setThemeState(resolveTheme());
+  });
+
+  const toggle = () => {
+    const next: ThemeChoice = theme() === "dark" ? "light" : "dark";
+    setTheme(next);
+    setThemeState(next);
+  };
+
+  return (
+    <button
+      type="button"
+      class="theme-toggle"
+      onClick={toggle}
+      aria-label={theme() === "dark" ? "Switch to light theme" : "Switch to dark theme"}
+      title={theme() === "dark" ? "Light mode" : "Dark mode"}
+    >
+      <Show when={theme() === "dark"} fallback={<span aria-hidden="true">☾</span>}>
+        <span aria-hidden="true">☀</span>
+      </Show>
+    </button>
+  );
+}