claude go reimplement

assets/styles/collapsible.css

@@ -0,0 +1,64 @@
+/* Collapsible Styling (dictionary definitions on /find) */
+
+.collapsible {
+  background-color: var(--color-bg-tertiary);
+  color: var(--color-text-primary);
+  cursor: pointer;
+  padding: 0.85rem 1.1rem;
+  min-height: 44px;
+  width: 100%;
+  max-width: var(--content-max-width);
+  border: 2px solid var(--color-border);
+  border-radius: var(--border-radius-sm);
+  text-align: left;
+  outline: none;
+  font-size: 1rem;
+  font-weight: 600;
+  font-family: var(--font-ui);
+  transition: background-color 150ms ease, border-color 150ms ease;
+  margin: 0.5rem auto 0;
+  display: block;
+}
+
+.collapsible::after {
+  content: "+";
+  float: right;
+  font-weight: 700;
+}
+
+.collapsible.active::after {
+  content: "\2212";
+}
+
+.collapsible:hover {
+  border-color: var(--color-accent-primary);
+  transform: none;
+}
+
+.collapsible:focus-visible {
+  border-color: var(--color-accent-primary);
+  box-shadow: 0 0 0 3px rgba(107, 155, 209, 0.3);
+}
+
+.collapsible.active {
+  background-color: var(--color-accent-primary);
+  color: var(--color-on-accent);
+  border-color: var(--color-accent-primary);
+}
+
+.collapsible.active:hover {
+  background-color: var(--color-accent-hover);
+  border-color: var(--color-accent-hover);
+}
+
+/* Collapsible content styling */
+.content {
+  display: none;
+  overflow: hidden;
+  background-color: var(--color-bg-secondary);
+  max-width: var(--content-max-width);
+  margin: 0 auto 0.5rem;
+  padding: 1rem 1.25rem;
+  border-radius: var(--border-radius-sm);
+  border: 1px solid var(--color-border);
+}