add first css

src/_includes/layouts/base.njk

@@ -6,7 +6,7 @@
   <title>{% if title and page.url != "/" %}{{ title }} · {% endif %}{{ site.title }}</title>
   <meta name="description" content="{{ description or site.description }}">
   <link rel="canonical" href="{{ site.url }}{{ page.url }}">
- 
+  <link rel="stylesheet" href="/assets/css/style.css">
 </head>
 <body>
   {% include "partials/header.njk" %}

src/assets/css/style.css

@@ -0,0 +1,44 @@
+:root {
+  --fg: #1d1d1f;
+  --bg: #fdfdfc;
+  --muted: #6b6b70;
+  --accent: #2456a6;
+  --measure: 42rem;
+  color-scheme: light dark;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root { --fg: #e8e8ea; --bg: #141416; --muted: #9a9aa2; --accent: #8fb3ff; }
+}
+
+*, *::before, *::after { box-sizing: border-box; }
+
+body {
+  margin: 0 auto;
+  padding: 1.5rem 1rem 3rem;
+  max-width: var(--measure);
+  font: 1.0625rem/1.6 system-ui, sans-serif;
+  color: var(--fg);
+  background: var(--bg);
+}
+
+a { color: var(--accent); }
+
+.site-header {
+  display: flex; flex-wrap: wrap; gap: 1rem;
+  align-items: baseline; justify-content: space-between;
+  margin-bottom: 2rem;
+}
+.site-title { font-weight: 700; text-decoration: none; color: inherit; }
+.site-header ul { display: flex; gap: 1rem; list-style: none; margin: 0; padding: 0; }
+.site-header [aria-current="page"] { font-weight: 600; text-decoration: none; }
+
+.meta { color: var(--muted); font-size: 0.9em; margin-top: -0.5rem; }
+
+.post-list { list-style: none; padding: 0; }
+.post-list li { margin: 0.5rem 0; }
+.post-list time { color: var(--muted); font-variant-numeric: tabular-nums; margin-right: 0.75rem; }
+
+pre { overflow-x: auto; padding: 0.75rem; background: color-mix(in srgb, var(--fg) 6%, transparent); }
+
+.site-footer { margin-top: 3rem; color: var(--muted); font-size: 0.9em; }