Restyle the frontend as an editorial magazine layout

Centred wordmark over a rule of category links, a lead article above a grid of
cards, centred article headers over a narrow reading column, and a footer split
into columns. Neutral warm-grey palette with a serif display face for headings
and small uppercase labels for metadata.

frontend/app/assets/css/main.css

@@ -1,13 +1,20 @@
 :root {
-  --color-text: #16181d;
-  --color-muted: #5b6270;
-  --color-bg: #ffffff;
-  --color-surface: #f5f6f8;
-  --color-border: #e2e5ea;
-  --color-accent: #2f4bd8;
-  --radius: 10px;
-  --width: 68rem;
-  --space: 1.25rem;
+  /* Neutral editorial palette: warm off-white paper, near-black ink. */
+  --color-ink: #14130f;
+  --color-body: #3d3a34;
+  --color-muted: #857f74;
+  --color-bg: #fbfaf7;
+  --color-surface: #f1efe9;
+  --color-border: #e0ddd4;
+  --color-rule: #14130f;
+
+  --font-display: Georgia, "Iowan Old Style", "Times New Roman", serif;
+  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
+
+  --width: 76rem;
+  --width-prose: 40rem;
+  --space: 1.5rem;
+  --radius: 2px;
 }
 
 *,
@@ -18,32 +25,38 @@
 
 body {
   margin: 0;
-  color: var(--color-text);
+  color: var(--color-body);
   background: var(--color-bg);
-  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
-  font-size: 1.05rem;
-  line-height: 1.65;
+  font-family: var(--font-sans);
+  font-size: 1rem;
+  line-height: 1.7;
+  -webkit-font-smoothing: antialiased;
 }
 
 img {
+  display: block;
   max-width: 100%;
   height: auto;
 }
 
 a {
-  color: var(--color-accent);
+  color: inherit;
 }
 
 h1,
 h2,
 h3 {
-  line-height: 1.25;
+  margin: 0;
+  color: var(--color-ink);
+  font-family: var(--font-display);
+  font-weight: 400;
+  line-height: 1.2;
   text-wrap: balance;
 }
 
 :focus-visible {
-  outline: 3px solid var(--color-accent);
-  outline-offset: 2px;
+  outline: 2px solid var(--color-ink);
+  outline-offset: 3px;
 }
 
 .container {
@@ -64,52 +77,129 @@ h3 {
   z-index: 10;
   padding: 0.5rem 0.75rem;
   background: var(--color-bg);
-  border: 1px solid var(--color-border);
-  border-radius: var(--radius);
+  border: 1px solid var(--color-ink);
 }
 
 .muted {
   color: var(--color-muted);
 }
 
+/* Small uppercase label used for categories, dates and section headings. */
+.kicker {
+  margin: 0;
+  font-family: var(--font-sans);
+  font-size: 0.7rem;
+  font-weight: 600;
+  letter-spacing: 0.14em;
+  text-transform: uppercase;
+  color: var(--color-muted);
+}
+
+.section-heading {
+  display: flex;
+  align-items: center;
+  gap: 1.25rem;
+  margin-block: 4rem 2rem;
+}
+
+.section-heading::after {
+  content: "";
+  flex: 1;
+  height: 1px;
+  background: var(--color-border);
+}
+
+/* Centred title block at the top of a listing page. */
+.page-header {
+  margin-bottom: 3.5rem;
+  padding-bottom: 2rem;
+  text-align: center;
+  border-bottom: 1px solid var(--color-border);
+}
+
+.page-header h1 {
+  font-size: clamp(2rem, 5vw, 3rem);
+}
+
+.page-header .kicker {
+  margin-bottom: 0.75rem;
+}
+
 .card-grid {
   display: grid;
-  gap: 1.75rem;
-  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
+  gap: 3rem 2.5rem;
+  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
   padding: 0;
   margin: 0;
   list-style: none;
 }
 
+/* Article body */
 .prose {
-  max-width: 44rem;
+  max-width: var(--width-prose);
+  font-size: 1.075rem;
+}
+
+.prose h2,
+.prose h3 {
+  margin-block: 2.5rem 0.75rem;
+}
+
+.prose h2 {
+  font-size: 1.6rem;
+}
+
+.prose h3 {
+  font-size: 1.25rem;
+}
+
+.prose p,
+.prose ul,
+.prose ol {
+  margin-block: 0 1.4rem;
+}
+
+.prose a {
+  text-decoration: underline;
+  text-underline-offset: 0.2em;
+}
+
+.prose blockquote {
+  margin: 2.5rem 0;
+  padding-left: 1.5rem;
+  border-left: 2px solid var(--color-ink);
+  font-family: var(--font-display);
+  font-size: 1.3rem;
+  line-height: 1.45;
+  color: var(--color-ink);
 }
 
 .prose img {
-  border-radius: var(--radius);
+  margin-block: 2rem;
 }
 
 .prose pre {
   overflow-x: auto;
-  padding: 1rem;
+  padding: 1rem 1.25rem;
   background: var(--color-surface);
   border-radius: var(--radius);
+  font-size: 0.9rem;
 }
 
-.tag-list {
+.prose code {
+  font-size: 0.9em;
+}
+
+.pagination {
   display: flex;
   flex-wrap: wrap;
-  gap: 0.5rem;
-  padding: 0;
-  margin: 2rem 0 0;
-  list-style: none;
-}
-
-.tag-list a {
-  display: inline-block;
-  padding: 0.15rem 0.6rem;
-  font-size: 0.9rem;
-  background: var(--color-surface);
-  border-radius: 999px;
-  text-decoration: none;
+  gap: 2rem;
+  align-items: center;
+  justify-content: center;
+  margin-top: 4rem;
+  padding-top: 2rem;
+  border-top: 1px solid var(--color-border);
+  font-size: 0.85rem;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
 }