various

frontend/src/DesktopWorkspace.css

@@ -120,6 +120,100 @@
   box-shadow: 2px 2px 4px var(--shadow-medium);
 }
 
+.desk-help-overlay {
+  position: fixed;
+  inset: 0;
+  z-index: 1400;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: clamp(1.5rem, 4vw, 3rem);
+  pointer-events: none;
+}
+
+.desk-help-overlay__backdrop {
+  position: absolute;
+  inset: 0;
+  background: var(--surface-overlay);
+  backdrop-filter: blur(8px);
+  pointer-events: auto;
+}
+
+.desk-help-overlay__content {
+  position: relative;
+  width: min(640px, 92vw);
+  max-height: min(80vh, 640px);
+  background: var(--surface);
+  border: 1px solid var(--border);
+  box-shadow: 0 24px 64px var(--shadow-strong);
+  border-radius: 1.25rem;
+  display: flex;
+  flex-direction: column;
+  pointer-events: auto;
+  overflow: hidden;
+}
+
+.desk-help-overlay__header,
+.desk-help-overlay__footer {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 1rem 1.25rem;
+}
+
+.desk-help-overlay__header {
+  border-bottom: 1px solid var(--border);
+}
+
+.desk-help-overlay__header h2 {
+  margin: 0;
+  font-size: 1.15rem;
+  font-weight: 600;
+}
+
+.desk-help-overlay__body {
+  padding: 1rem 1.25rem 1.5rem;
+  overflow-y: auto;
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+  line-height: 1.55;
+}
+
+.desk-help-overlay__body p {
+  margin: 0;
+  color: var(--muted);
+}
+
+.desk-help-overlay__list {
+  margin: 0;
+  padding-left: 1.1rem;
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+}
+
+.desk-help-overlay__list li {
+  color: var(--fg);
+}
+
+.desk-help-overlay__body kbd {
+  display: inline-block;
+  padding: 0.15rem 0.4rem;
+  border-radius: 0.4rem;
+  border: 1px solid var(--border-strong);
+  background: var(--surface-subtle);
+  font-size: 0.85em;
+  line-height: 1;
+  font-family: inherit;
+}
+
+.desk-help-overlay__footer {
+  border-top: 1px solid var(--border);
+  justify-content: flex-end;
+  gap: 0.5rem;
+}
+
 .tag-chip--draggable:active {
   cursor: grabbing;
 }