--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hg-web/src/base.css	Sat Jan 03 10:20:45 2026 -0800
@@ -0,0 +1,141 @@
+/* --- Colors  ---*/
+:root {
+  --bg: #ffffff;
+  --fg: #1a1a1a;
+  --border: #e0e0e0;
+  --hover: #f5f5f5;
+  --accent: #0066cc;
+  --accent-hover: #0052a3;
+  --secondary: #6c757d;
+  --success: #28a745;
+  --warning: #ffc107;
+  --danger: #dc3545;
+  --code-bg: #f6f8fa;
+  --link: #0066cc;
+  --link-hover: #0052a3;
+}
+
+.dark {
+  --bg: #0d1117;
+  --fg: #c9d1d9;
+  --border: #30363d;
+  --hover: #161b22;
+  --accent: #58a6ff;
+  --accent-hover: #79c0ff;
+  --secondary: #8b949e;
+  --success: #3fb950;
+  --warning: #d29922;
+  --danger: #f85149;
+  --code-bg: #161b22;
+  --link: #58a6ff;
+  --link-hover: #79c0ff;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root:not(.light-mode) {
+    --bg: #0d1117;
+    --fg: #c9d1d9;
+    --border: #30363d;
+    --hover: #161b22;
+    --accent: #58a6ff;
+    --accent-hover: #79c0ff;
+    --secondary: #8b949e;
+    --success: #3fb950;
+    --warning: #d29922;
+    --danger: #f85149;
+    --code-bg: #161b22;
+    --link: #58a6ff;
+    --link-hover: #79c0ff;
+  }
+}
+
+/* --- Reset and Base Styles --- */
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+html {
+  background: var(--bg);
+  color: var(--fg);
+}
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
+  line-height: 1.6;
+  background: var(--bg);
+  color: var(--fg);
+  font-size: 16px;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+main {
+  max-width: 1200px;
+  margin: 0 auto;
+  padding: 2rem;
+}
+
+a {
+  color: var(--link);
+  text-decoration: none;
+}
+
+a:hover {
+  color: var(--link-hover);
+  text-decoration: underline;
+}
+
+h1, h2, h3, h4, h5, h6 {
+  margin-bottom: 1rem;
+  font-weight: 600;
+  line-height: 1.25;
+}
+
+h1 { font-size: 2rem; }
+h2 { font-size: 1.75rem; }
+h3 { font-size: 1.5rem; }
+h4 { font-size: 1.25rem; }
+h5 { font-size: 1.1rem; }
+h6 { font-size: 1rem; }
+
+p {
+  margin-bottom: 1rem;
+}
+
+code {
+  background: var(--code-bg);
+  padding: 0.2em 0.4em;
+  border-radius: 3px;
+  font-family: 'Monaco', 'Courier New', monospace;
+  font-size: 0.9em;
+}
+
+pre {
+  background: var(--code-bg);
+  padding: 1rem;
+  border-radius: 6px;
+  overflow-x: auto;
+  margin-bottom: 1rem;
+}
+
+pre code {
+  background: none;
+  padding: 0;
+}
+
+/* Mobile responsive */
+@media (max-width: 768px) {
+  body {
+    font-size: 14px;
+  }
+
+  main {
+    padding: 1rem;
+  }
+
+  h1 { font-size: 1.75rem; }
+  h2 { font-size: 1.5rem; }
+  h3 { font-size: 1.25rem; }
+}