feat: custom theme

scss/_utilities.scss

@@ -0,0 +1,36 @@
+// Global border-radius override (sharp corners principle)
+* {
+  border-radius: 0 !important;
+}
+
+// Remove any gradients from buttons
+.btn {
+  background-image: none !important;
+  border-radius: 0 !important;
+}
+
+// Navbar - sharp corners, solid colors
+.navbar {
+  border-radius: 0 !important;
+  background-image: none !important;
+}
+
+// Cards and panels
+.card {
+  border-radius: 0 !important;
+}
+
+// Code blocks
+pre, code {
+  border-radius: 0 !important;
+}
+
+// Quarto-specific elements
+.quarto-title-block {
+  border-radius: 0 !important;
+}
+
+// Input elements
+input, select, textarea, button {
+  border-radius: 0 !important;
+}