Make the site responsive for phones, tablets, and desktop

Mobile-first layout with breakpoints at 48rem (tablet) and 64rem (desktop):
stacked nav on phones, progressive column counts for the article grid and
footer, scrollable markdown tables, larger tap targets on nav links.

frontend/app/assets/css/main.css

@@ -13,8 +13,18 @@
 
   --width: 76rem;
   --width-prose: 40rem;
-  --space: 1.5rem;
   --radius: 2px;
+
+  /* Breakpoints used throughout: 48rem = tablet, 64rem = desktop. */
+  --space: 1.1rem;
+  --gap-section: 2.5rem;
+}
+
+@media (min-width: 48rem) {
+  :root {
+    --space: 1.5rem;
+    --gap-section: 4rem;
+  }
 }
 
 *,
@@ -99,7 +109,7 @@ h3 {
   display: flex;
   align-items: center;
   gap: 1.25rem;
-  margin-block: 4rem 2rem;
+  margin-block: var(--gap-section) 1.75rem;
 }
 
 .section-heading::after {
@@ -111,8 +121,8 @@ h3 {
 
 /* Centred title block at the top of a listing page. */
 .page-header {
-  margin-bottom: 3.5rem;
-  padding-bottom: 2rem;
+  margin-bottom: var(--gap-section);
+  padding-bottom: 1.75rem;
   text-align: center;
   border-bottom: 1px solid var(--color-border);
 }
@@ -127,17 +137,40 @@ h3 {
 
 .card-grid {
   display: grid;
-  gap: 3rem 2.5rem;
-  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
+  gap: 2.25rem 1.5rem;
+  /* One column on phones, two on tablets, three or more on wide screens. */
+  grid-template-columns: repeat(auto-fill, minmax(min(100%, 16rem), 1fr));
   padding: 0;
   margin: 0;
   list-style: none;
 }
 
+@media (min-width: 48rem) {
+  .card-grid {
+    gap: 3rem 2.5rem;
+  }
+}
+
 /* Article body */
 .prose {
   max-width: var(--width-prose);
-  font-size: 1.075rem;
+  font-size: 1.0125rem;
+  /* Editors paste long URLs; without this they push the page sideways. */
+  overflow-wrap: break-word;
+}
+
+@media (min-width: 48rem) {
+  .prose {
+    font-size: 1.075rem;
+  }
+}
+
+/* Markdown tables have no wrapper to scroll, so the table scrolls itself. */
+.prose table {
+  display: block;
+  max-width: 100%;
+  overflow-x: auto;
+  border-collapse: collapse;
 }
 
 .prose h2,
@@ -193,10 +226,10 @@ h3 {
 .pagination {
   display: flex;
   flex-wrap: wrap;
-  gap: 2rem;
+  gap: 1rem 2rem;
   align-items: center;
   justify-content: center;
-  margin-top: 4rem;
+  margin-top: var(--gap-section);
   padding-top: 2rem;
   border-top: 1px solid var(--color-border);
   font-size: 0.85rem;

frontend/app/components/ArticleCard.vue

@@ -10,14 +10,16 @@ const cover = computed(() => mediaUrl(props.article.cover))
 
 <template>
   <article class="card">
+    <!-- No placeholder box when there is no cover: an empty grey rectangle
+         reads as a broken image rather than as a deliberate choice. -->
     <NuxtLinkLocale
+      v-if="cover"
       class="cover-link"
       :to="`/blog/${article.slug}`"
       tabindex="-1"
       aria-hidden="true"
     >
       <img
-        v-if="cover"
         class="cover"
         :src="cover"
         :alt="article.cover?.alternativeText ?? ''"
@@ -25,7 +27,6 @@ const cover = computed(() => mediaUrl(props.article.cover))
         :height="article.cover?.height ?? undefined"
         loading="lazy"
       >
-      <span v-else class="cover placeholder" />
     </NuxtLinkLocale>
 
     <p v-if="article.category" class="kicker">{{ article.category.name }}</p>
@@ -60,11 +61,9 @@ const cover = computed(() => mediaUrl(props.article.cover))
   transform: scale(1.03);
 }
 
-.placeholder {
-  display: block;
-}
-
-.kicker {
+/* Without a cover the kicker leads the card, so it needs no offset. */
+.cover-link + .kicker,
+.cover-link + h2 {
   margin-top: 1.1rem;
 }
 

frontend/app/components/LanguageSwitcher.vue

@@ -35,19 +35,28 @@ function onChange(event: Event) {
 
 select {
   appearance: none;
-  padding: 0.35rem 1.6rem 0.35rem 0.7rem;
+  padding: 0.4rem 1.7rem 0.4rem 0.7rem;
   border: 1px solid var(--color-border);
   border-radius: 0;
   background: transparent;
   color: var(--color-body);
   font: inherit;
-  font-size: 0.75rem;
+  /* Safari on iOS zooms the page when a control smaller than 16px is tapped,
+     so the picker stays at 1rem on phones and shrinks only from tablet up. */
+  font-size: 1rem;
   font-weight: 600;
   letter-spacing: 0.14em;
   text-transform: uppercase;
   cursor: pointer;
 }
 
+@media (min-width: 48rem) {
+  select {
+    padding: 0.35rem 1.6rem 0.35rem 0.7rem;
+    font-size: 0.75rem;
+  }
+}
+
 select:hover {
   border-color: var(--color-ink);
   color: var(--color-ink);

frontend/app/layouts/default.vue

@@ -102,11 +102,17 @@ const { data: categories } = await useFetch<Category[]>('/api/categories', {
 
 /* Header: centred wordmark over a thin rule of links. */
 .site-header {
-  padding-top: 2.5rem;
+  padding-top: 1.5rem;
   text-align: center;
   border-bottom: 1px solid var(--color-border);
 }
 
+@media (min-width: 48rem) {
+  .site-header {
+    padding-top: 2.5rem;
+  }
+}
+
 .wordmark {
   margin: 0;
 }
@@ -127,23 +133,24 @@ const { data: categories } = await useFetch<Category[]>('/api/categories', {
 }
 
 .site-nav {
-  margin-top: 2rem;
+  margin-top: 1.25rem;
   border-top: 1px solid var(--color-border);
 }
 
+/* Phones stack the links above the language picker, both centred; from tablet
+   up they sit on one line with the picker pushed to the right. */
 .nav-inner {
   display: flex;
-  flex-wrap: wrap;
-  gap: 0.75rem 2rem;
+  flex-direction: column;
   align-items: center;
-  justify-content: space-between;
-  padding-block: 0.9rem;
+  gap: 0.5rem;
+  padding-block: 0.6rem;
 }
 
 .site-nav ul {
   display: flex;
   flex-wrap: wrap;
-  gap: 0.25rem 2rem;
+  gap: 0 1.25rem;
   justify-content: center;
   padding: 0;
   margin: 0;
@@ -154,10 +161,30 @@ const { data: categories } = await useFetch<Category[]>('/api/categories', {
   text-transform: uppercase;
 }
 
+@media (min-width: 48rem) {
+  .site-nav {
+    margin-top: 2rem;
+  }
+
+  .nav-inner {
+    flex-direction: row;
+    flex-wrap: wrap;
+    justify-content: space-between;
+    gap: 0.75rem 2rem;
+    padding-block: 0.9rem;
+  }
+
+  .site-nav ul {
+    gap: 0.25rem 2rem;
+  }
+}
+
 .site-nav a {
+  display: inline-block;
   text-decoration: none;
   color: var(--color-body);
-  padding-block: 0.25rem;
+  /* Roomy enough to tap accurately on a phone. */
+  padding-block: 0.6rem;
   border-bottom: 1px solid transparent;
 }
 
@@ -169,7 +196,13 @@ const { data: categories } = await useFetch<Category[]>('/api/categories', {
 
 .site-main {
   flex: 1;
-  padding-block: 3.5rem 5rem;
+  padding-block: 2.25rem 3.5rem;
+}
+
+@media (min-width: 48rem) {
+  .site-main {
+    padding-block: 3.5rem 5rem;
+  }
 }
 
 /* Footer: columns, then a centred copyright line. */
@@ -179,13 +212,28 @@ const { data: categories } = await useFetch<Category[]>('/api/categories', {
   border-top: 1px solid var(--color-border);
 }
 
+/* One column on phones, two on tablets, four on desktop — auto-fit would
+   otherwise leave the fourth block stranded on its own row on a tablet. */
 .footer-inner {
   display: grid;
-  gap: 2.5rem;
-  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
+  gap: 2rem;
+  grid-template-columns: 1fr;
   padding-bottom: 2.5rem;
 }
 
+@media (min-width: 48rem) {
+  .footer-inner {
+    grid-template-columns: repeat(2, 1fr);
+    gap: 2.5rem;
+  }
+}
+
+@media (min-width: 64rem) {
+  .footer-inner {
+    grid-template-columns: repeat(4, 1fr);
+  }
+}
+
 .footer-block p:last-of-type {
   margin-bottom: 0;
 }

frontend/app/pages/blog/[slug].vue

@@ -99,10 +99,16 @@ useHead({
   max-width: 46rem;
   /* The gap below the header lives here, not on the cover: an article without
      a cover image would otherwise have its body butting against the byline. */
-  margin: 0 auto 3rem;
+  margin: 0 auto 2rem;
   text-align: center;
 }
 
+@media (min-width: 48rem) {
+  .article-header {
+    margin-bottom: 3rem;
+  }
+}
+
 .article-header nav a {
   text-decoration: none;
 }

frontend/app/pages/index.vue

@@ -40,21 +40,20 @@ useSeoMeta({
     <p v-else-if="!featured">{{ $t('list.empty') }}</p>
 
     <template v-else>
-      <article class="featured">
+      <article class="featured" :class="{ 'has-cover': featuredCover }">
         <NuxtLinkLocale
+          v-if="featuredCover"
           class="featured-cover"
           :to="`/blog/${featured.slug}`"
           tabindex="-1"
           aria-hidden="true"
         >
           <img
-            v-if="featuredCover"
             :src="featuredCover"
             :alt="featured.cover?.alternativeText ?? ''"
             :width="featured.cover?.width ?? undefined"
             :height="featured.cover?.height ?? undefined"
           >
-          <span v-else class="placeholder" />
         </NuxtLinkLocale>
 
         <div class="featured-text">
@@ -97,25 +96,33 @@ useSeoMeta({
 <style scoped>
 .featured {
   display: grid;
-  gap: 2.5rem;
+  gap: 1.5rem;
   align-items: center;
   grid-template-columns: 1fr;
 }
 
-@media (min-width: 52rem) {
-  .featured {
+/* Stacked on phones and portrait tablets — a side-by-side split below this
+   width leaves both the image and the headline too cramped to read. The split
+   also needs a cover to sit in it, or one column would just be empty. */
+@media (min-width: 64rem) {
+  .featured.has-cover {
     grid-template-columns: 1.35fr 1fr;
     gap: 3.5rem;
   }
 }
 
+/* Without a cover the headline is the whole lead, so it gets the full width
+   but stays inside a readable measure. */
+.featured:not(.has-cover) .featured-text {
+  max-width: 46rem;
+}
+
 .featured-cover {
   display: block;
   overflow: hidden;
 }
 
-.featured-cover img,
-.placeholder {
+.featured-cover img {
   width: 100%;
   aspect-ratio: 3 / 2;
   object-fit: cover;
@@ -156,7 +163,7 @@ useSeoMeta({
 }
 
 .more {
-  margin-top: 4rem;
+  margin-top: var(--gap-section);
   text-align: center;
   font-size: 0.75rem;
   font-weight: 600;