🎨 Palette: skip-to-content 포커스 가시성(focus-visible) 개선

.jules/palette.md

@@ -19,3 +19,7 @@
 ## 2024-07-13 - CLI Debugging Stack Traces
 **Learning:** Adding a `FAST_MLSIRM_DEBUG` bypass to user-friendly `try/except` blocks is crucial for DX. Otherwise, unexpected runtime errors during development will be swallowed into generic stderr messages, hiding the stack trace needed to actually fix the bug.
 **Action:** When adding `try-except` blocks to Python CLI subcommands to improve Developer Experience (DX) by preventing raw tracebacks for users, include a debug bypass (e.g., `if os.environ.get("FAST_MLSIRM_DEBUG"): raise`) in *all* catch blocks (including `RuntimeError` and `Exception`) to ensure tracebacks aren't swallowed during local development and debugging.
+
+## 2024-07-14 - Skip-to-Content Target Focus Visibility
+**Learning:** When adding `tabindex="-1"` and `outline: none;` to the primary content container (`<main>`) to receive focus from a skip-to-content link, keyboard users navigating via Tab may lose track of their position since the visual outline is hidden to prevent display on mouse clicks.
+**Action:** Use the `:focus-visible` pseudo-class (e.g., `main:focus-visible { outline: 3px solid var(--teal); outline-offset: 3px; }`) on the skip-to-content target element. This ensures that while mouse interactions don't show the outline, keyboard navigation triggers a clear visual indicator so users know where they are.

python/fast_mlsirm/report.py

@@ -498,6 +498,11 @@ def _css() -> str:
   outline: none;
 }
 
+main:focus-visible {
+  outline: 3px solid var(--teal);
+  outline-offset: 3px;
+}
+
 .hero {
   min-height: 172px;
   display: flex;