SEO

frontend/app/assets/css/shared.scss

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+// Shared TUI transition mixin
+@mixin tui-transition($steps: 2) {
+  transition: all 0.1s steps($steps, end);
+}
+
+// Box-drawing content string for borders (top/bottom frame lines)
+$box-line-top: "═══════════════════";
+
+/* Global rules - no-sprite pages hide the undertable sprite area */
+.no-sprite .undertable-wrapper {
+  display: none;
+}
+
+// Dropdown transition keyframes (used by LanguageSelector and ThemeSelector)
+.dropdown-enter-active, .dropdown-leave-active {
+  transition: opacity 0.2s ease, transform 0.2s ease;
+}
+.dropdown-enter-from, .dropdown-leave-to {
+  opacity: 0;
+  transform: translateY(-8px);
+}
+
+// Dropdown button shared styles
+.tui-dropdown-button {
+  background: var(--color-background-fore);
+  color: var(--color-text);
+  font-size: 1em;
+  border: 1px solid var(--color-border-color);
+  padding: 8px 12px;
+  border-radius: 0;
+  cursor: pointer;
+}