refactor: slimmer header, JS-less hamburger menu, bottom-aligned mobile nav

- Reduce header height to 3rem with CSS variable --header-h
- Scale logo via --symbol-size variable, decrease nav link font sizes
- Replace JS-driven sidebar toggle with checkbox hack (:has selector)
- Separate drop shadow into own element for correct z-index layering
  (top bar > sidebar > shadow)
- Bottom-align mobile nav links via ::before flex spacer
- Slide-in transition scoped to :has(:checked) to prevent resize artifacts

src/lib/components/Header.svelte

@@ -23,10 +23,9 @@ let underlineWidth = $state(0);
 let disableTransition = $state(false);
 
 function toggle_sidebar(state){
-	// state: force hidden state (optional)
+	const checkbox = document.getElementById('nav-toggle')
-	const nav_el = document.querySelector("nav")
+	if(state === undefined) checkbox.checked = !checkbox.checked
-	if(state === undefined) nav_el.hidden = !nav_el.hidden
+	else checkbox.checked = !state
-	else nav_el.hidden = state
 }
 
 function updateUnderline() {
@@ -93,16 +92,16 @@ nav{
 	background-color: var(--nord0);
 	top: 0;
 	z-index: 10;
-	display: flex !important;
+	display: flex;
 	flex-direction: row;
 	justify-content: space-between !important;
 	align-items: center;
 	box-shadow: 0 1em 1rem 0rem rgba(0,0,0,0.4);
-	height: 4rem;
+	height: var(--header-h);
 	padding-left: 0.5rem;
 }
-nav[hidden]{
+.nav-toggle{
-	display:block;
+	display: none;
 }
 
 :global(.site_header li),
@@ -116,20 +115,20 @@ nav[hidden]{
 :global(.site_header li>a)
 {
 	text-decoration: none;
-	font-size: 1.2rem;
+	font-size: 1rem;
 	color: inherit;
 	border-radius: var(--radius-pill);
-	padding: 0.5rem 0.75rem;
+	padding: 0.4rem 0.6rem;
 }
 :global(a.entry),
 :global(a.entry:link),
 :global(a.entry:visited)
 {
 	text-decoration: none;
-	font-size: 1.2rem;
+	font-size: 1rem;
 	color: white !important;
 	border-radius: var(--radius-pill);
-	padding: 0.5rem 0.75rem;
+	padding: 0.4rem 0.6rem;
 }
 
 :global(.site_header li:hover),
@@ -176,6 +175,9 @@ nav[hidden]{
 	display: none;
 	padding-inline: 0.5rem;
 }
+.header-shadow{
+	display: none;
+}
 .right-buttons{
 	display: flex;
 	align-items: center;
@@ -187,9 +189,10 @@ nav[hidden]{
 	gap: 0.5rem;
 }
 :global(svg.symbol){
-	height: 4rem;
+	--symbol-size: calc(var(--header-h) - 1rem);
-	width: 4rem;
+	width: var(--symbol-size);
 	border-radius: 10000px;
+	margin: 0.25rem;
 }
 /*:global(a:has(svg.symbol)){
 	padding: 0 !important;
@@ -198,6 +201,8 @@ nav[hidden]{
 	margin-left: 1rem;
 }*/
 .wrapper{
+	--header-h: 3rem;
+	--symbol-size: calc(var(--header-h) - 1rem);
 	display:flex;
 	flex-direction: column;
 	min-height: 100svh;
@@ -206,37 +211,51 @@ footer{
 	padding-block: 1rem;
 	text-align: center;
 	margin-top: auto;
+	position: relative;
 }
 
 @media screen and (max-width: 800px) {
 	.button_wrapper{
-		box-shadow: 0 1em 1rem 0rem rgba(0,0,0,0.4);
 		display: flex;
 		justify-content: space-between;
 		align-items: center;
 		position: sticky;
 		background-color: var(--nord0);
 		width: 100%;
-		height: 4rem;
+		height: var(--header-h);
 		top: 0;
 		z-index: 9999;
 	}
-	.nav_button{
+	.header-shadow{
-		border: unset;
-		background-color: unset;
 		display: block;
+		position: sticky;
+		top: 0;
+		width: 100%;
+		height: var(--header-h);
+		margin-top: calc(-1 * var(--header-h));
+		box-shadow: 0 1em 1rem 0rem rgba(0,0,0,0.4);
+		z-index: 9997;
+		pointer-events: none;
+	}
+	.nav_button{
+		display: inline-flex;
+		align-items: center;
+		justify-content: center;
 		fill: white;
 		margin-inline: 0.5rem;
-		width: 2rem;
+		width: 1.25rem;
-		aspect-ratio: 1;
+		height: 1.25rem;
+		cursor: pointer;
 	}
 	.nav_button svg{
 		width: 100%;
 		height: 100%;
 		transition: var(--transition-fast);
 	}
-	.nav_button:focus{
+	.nav_button:hover,
-		fill: var(--red);
+	.nav_button:active,
+	.nav-toggle:focus-visible + .nav_button{
+		fill: var(--nord8);
 		scale: 0.9;
 	}
 	.nav_site{
@@ -246,42 +265,44 @@ footer{
 		height: 100vh; /* dvh does not work, breaks because of transition and only being applied after scroll ends*/
 		margin-bottom: 50vh;
 		width: min(95svw, 25em);
-		transition: transform 100ms;
+		z-index: 9998;
-		z-index: 10;
 		flex-direction: column;
-		justify-content: flex-start !important;
-		align-items: left;
-		justify-content: space-between!important;
 		padding-inline: 0.5rem;
 	}
+	.nav_site::before{
+		content: '';
+		flex: 1;
+	}
 	:global(.nav_site ul){
 		width: 100% ;
 	}
 	.nav_site :first-child{
 		display:none;
 	}
-	.nav_site[hidden]{
+	.nav_site{
 		transform: translateX(100%);
 	}
+	.wrapper:has(.nav-toggle:checked) .nav_site{
+		transform: translateX(0);
+		transition: transform 100ms;
+	}
 	:global(.nav_site a:last-child){
 		margin-bottom: 2rem;
 	}
 
 	.nav_site .links-wrapper {
-		align-self: flex-start;
 		width: 100%;
-		margin: 2rem;
+		padding: 0 2rem;
 	}
 	:global(.site_header){
 		flex-direction: column;
-		padding-top: min(10rem, 10vh);
 		align-items: flex-start;
 	}
 	:global(.site_header li, .site_header a){
-		font-size: 4rem;
+		font-size: 1.5rem;
 	}
 	:global(.site_header li > a, .site_header a){
-		font-size: 2rem;
+		font-size: 1.3rem;
 	}
 	:global(.site_header li:hover),
 	:global(.site_header li:focus-within){
@@ -314,10 +335,12 @@ footer{
 <a href="/" aria-label="Home"><Symbol></Symbol></a>
 <div class="right-buttons">
 	{@render language_selector_mobile?.()}
-	<button class=nav_button onclick={() => {toggle_sidebar()}} aria-label="Toggle navigation menu"><svg xmlns="http://www.w3.org/2000/svg" height="0.5em" viewBox="0 0 448 512"><!--! Font Awesome Free 6.4.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2023 Fonticons, Inc. --><path d="M0 96C0 78.3 14.3 64 32 64H416c17.7 0 32 14.3 32 32s-14.3 32-32 32H32C14.3 128 0 113.7 0 96zM0 256c0-17.7 14.3-32 32-32H416c17.7 0 32 14.3 32 32s-14.3 32-32 32H32c-17.7 0-32-14.3-32-32zM448 416c0 17.7-14.3 32-32 32H32c-17.7 0-32-14.3-32-32s14.3-32 32-32H416c17.7 0 32 14.3 32 32z"/></svg></button>
+	<input type="checkbox" id="nav-toggle" class="nav-toggle" aria-label="Toggle navigation menu" />
+	<label for="nav-toggle" class=nav_button aria-hidden="true"><svg xmlns="http://www.w3.org/2000/svg" height="0.5em" viewBox="0 0 448 512"><!--! Font Awesome Free 6.4.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2023 Fonticons, Inc. --><path d="M0 96C0 78.3 14.3 64 32 64H416c17.7 0 32 14.3 32 32s-14.3 32-32 32H32C14.3 128 0 113.7 0 96zM0 256c0-17.7 14.3-32 32-32H416c17.7 0 32 14.3 32 32s-14.3 32-32 32H32c-17.7 0-32-14.3-32-32zM448 416c0 17.7-14.3 32-32 32H32c-17.7 0-32-14.3-32-32s14.3-32 32-32H416c17.7 0 32 14.3 32 32z"/></svg></label>
 </div>
 </div>
-<nav hidden class=nav_site>
+<div class="header-shadow"></div>
+<nav class=nav_site>
 	<a href="/" aria-label="Home"><Symbol></Symbol></a>
 	<div class="links-wrapper">
 		{@render links?.()}

src/lib/components/LinksGrid.svelte

@@ -30,7 +30,7 @@
 }
 .links_grid{
 	display: grid;
-	grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
+	grid-template-columns: repeat(auto-fit, minmax(min(250px, calc(50% - 1rem)), 1fr));
 	gap: 2rem;
 	max-width: 1000px;
 	margin-inline: auto;
@@ -68,6 +68,38 @@
 	opacity: 0.6;
 }
 
+@media (max-width: 560px) {
+	.links_grid {
+		gap: 1rem;
+		padding: 1.5rem 0.75rem;
+	}
+	:global(.links_grid a :is(svg, img)) {
+		height: 72px;
+	}
+	:global(.links_grid h3) {
+		font-size: 1.2rem;
+	}
+	:global(.links_grid a) {
+		padding: 0.75rem;
+	}
+}
+
+@media (max-width: 410px) {
+	.links_grid {
+		gap: 0.5rem;
+		padding: 1rem 0.5rem;
+	}
+	:global(.links_grid a :is(svg, img)) {
+		height: 48px;
+	}
+	:global(.links_grid h3) {
+		font-size: 0.95rem;
+	}
+	:global(.links_grid a) {
+		padding: 0.5rem;
+	}
+}
+
 @media (prefers-color-scheme: dark){
 	:global(.links_grid h3){
 		color: white;

src/lib/components/Symbol.svelte

@@ -6,7 +6,7 @@
 	}
 	svg{
 		transition: var(--transition-fast);
-		height: 3em;
+		height: var(--symbol-size, 3em);
 	}
 	svg:hover,
 	svg:focus-visible

src/routes/[recipeLang=recipeLang]/+page.svelte

@@ -130,7 +130,7 @@
 /* ─── Hero parallax (same scaleY technique as TitleImgParallax) ─── */
 .hero-section {
 	--parallax-scale: 0.3;
-	margin-bottom: -20vh;
+	margin-bottom: calc(var(--parallax-scale) * (20vh - min(60vh, 520px)));
 	transform-origin: center top;
 	transform: translateY(-1rem) scaleY(calc(1 - var(--parallax-scale)));
 }