Initial commit: site code, layouts, content (images added separately)

Fixes duplicate placeholder cover image on the 3 newest blog posts,
broken aspect-ratio classes on the albums listing page, and a
non-responsive fixed sidebar on the chat page.

assets/css/main.css

@@ -0,0 +1,21 @@
+@import "tailwindcss";
+
+@theme {
+  --color-primary: #059669;
+  --color-secondary: #0ea5e9;
+  --color-surface: #1f2937;
+  --color-background: #111827;
+  --font-sans: 'Inter', 'system-ui', 'sans-serif';
+}
+
+@layer base {
+  body {
+    background-color: var(--color-background);
+    color: #e5e7eb;
+    font-family: var(--font-sans);
+  }
+  h1, h2, h3, h4 {
+    font-weight: 700;
+    color: #f9fafb;
+  }
+}