Alan turing portal (#815)

* [alan-turing-portal][m] - initial commit

* [alan-turing][m] - first page with search

* [alan-turing][m] - cleanup

examples/alan-turing-portal/components/Header.jsx

@@ -0,0 +1,109 @@
+import { useRef } from 'react'
+import { useRouter } from 'next/router'
+
+import { Container } from '../components/Container'
+
+function SunIcon(props) {
+  return (
+    <svg
+      viewBox="0 0 24 24"
+      strokeWidth="1.5"
+      strokeLinecap="round"
+      strokeLinejoin="round"
+      aria-hidden="true"
+      {...props}
+    >
+      <path d="M8 12.25A4.25 4.25 0 0 1 12.25 8v0a4.25 4.25 0 0 1 4.25 4.25v0a4.25 4.25 0 0 1-4.25 4.25v0A4.25 4.25 0 0 1 8 12.25v0Z" />
+      <path
+        d="M12.25 3v1.5M21.5 12.25H20M18.791 18.791l-1.06-1.06M18.791 5.709l-1.06 1.06M12.25 20v1.5M4.5 12.25H3M6.77 6.77 5.709 5.709M6.77 17.73l-1.061 1.061"
+        fill="none"
+      />
+    </svg>
+  )
+}
+
+function MoonIcon(props) {
+  return (
+    <svg viewBox="0 0 24 24" aria-hidden="true" {...props}>
+      <path
+        d="M17.25 16.22a6.937 6.937 0 0 1-9.47-9.47 7.451 7.451 0 1 0 9.47 9.47ZM12.75 7C17 7 17 2.75 17 2.75S17 7 21.25 7C17 7 17 11.25 17 11.25S17 7 12.75 7Z"
+        strokeWidth="1.5"
+        strokeLinecap="round"
+        strokeLinejoin="round"
+      />
+    </svg>
+  )
+}
+
+function ModeToggle() {
+  function disableTransitionsTemporarily() {
+    document.documentElement.classList.add('[&_*]:!transition-none')
+    window.setTimeout(() => {
+      document.documentElement.classList.remove('[&_*]:!transition-none')
+    }, 0)
+  }
+
+  function toggleMode() {
+    disableTransitionsTemporarily()
+
+    let darkModeMediaQuery = window.matchMedia('(prefers-color-scheme: dark)')
+    let isSystemDarkMode = darkModeMediaQuery.matches
+    let isDarkMode = document.documentElement.classList.toggle('dark')
+
+    if (isDarkMode === isSystemDarkMode) {
+      delete window.localStorage.isDarkMode
+    } else {
+      window.localStorage.isDarkMode = isDarkMode
+    }
+  }
+
+  return (
+    <button
+      type="button"
+      aria-label="Toggle dark mode"
+      className="group rounded-full bg-white/90 px-3 py-2 shadow-lg shadow-zinc-800/5 ring-1 ring-zinc-900/5 backdrop-blur transition dark:bg-zinc-800/90 dark:ring-white/10 dark:hover:ring-white/20"
+      onClick={toggleMode}
+    >
+      <SunIcon className="h-6 w-6 fill-zinc-100 stroke-zinc-500 transition group-hover:fill-zinc-200 group-hover:stroke-zinc-700 dark:hidden [@media(prefers-color-scheme:dark)]:fill-teal-50 [@media(prefers-color-scheme:dark)]:stroke-teal-500 [@media(prefers-color-scheme:dark)]:group-hover:fill-teal-50 [@media(prefers-color-scheme:dark)]:group-hover:stroke-teal-600" />
+      <MoonIcon className="hidden h-6 w-6 fill-zinc-700 stroke-zinc-500 transition dark:block [@media(prefers-color-scheme:dark)]:group-hover:stroke-zinc-400 [@media_not_(prefers-color-scheme:dark)]:fill-teal-400/10 [@media_not_(prefers-color-scheme:dark)]:stroke-teal-500" />
+    </button>
+  )
+}
+
+export function Header() {
+  let isHomePage = useRouter().pathname === '/'
+
+  let headerRef = useRef()
+
+  return (
+    <>
+      <header
+        className="pointer-events-none relative z-50 flex flex-col"
+        style={{
+          height: 'var(--header-height)',
+          marginBottom: 'var(--header-mb)',
+        }}
+      >
+        <div
+          ref={headerRef}
+          className="top-0 z-10 h-16 pt-6"
+          style={{ position: 'var(--header-position)' }}
+        >
+          <Container
+            className="top-[var(--header-top,theme(spacing.6))] w-full"
+            style={{ position: 'var(--header-inner-position)' }}
+          >
+            <div className="relative flex gap-4">
+              <div className="flex justify-end md:flex-1">
+                <div className="pointer-events-auto">
+                  <ModeToggle />
+                </div>
+              </div>
+            </div>
+          </Container>
+        </div>
+      </header>
+      {isHomePage && <div style={{ height: 'var(--content-offset)' }} />}
+    </>
+  )
+}