CUB-122: Scaffold Control Center React frontend

frontend-legacy/src/app/layout/nav-rail/nav-rail.component.scss

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+// ============================================================================
+// Nav Rail — Desktop/Kiosk Navigation
+// Per CUB-27 spec breakpoints:
+//   Compact  (0–599px):  Hidden — bottom nav takes over
+//   Medium   (600–1023px): Collapsed (72px), icon-only
+//   Expanded (≥1024px):  Expandable (72px collapsed / 256px expanded on hover)
+// Section 5.4: Spacing & Grid
+// ============================================================================
+
+.nav-rail {
+  display: none; // Hidden by default (mobile-first)
+  flex-direction: column;
+  width: var(--cc-nav-rail-collapsed-width);
+  min-height: 100vh;
+  background-color: var(--cc-surface-container-high);
+  border-right: 1px solid var(--cc-outline);
+  transition: width 200ms cubic-bezier(0.4, 0, 0.2, 1);
+  overflow: hidden;
+  z-index: 10;
+
+  &--expanded {
+    width: var(--cc-nav-rail-expanded-width);
+  }
+}
+
+.nav-rail__header {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 16px 12px;
+  min-height: 64px;
+  border-bottom: 1px solid var(--cc-outline);
+}
+
+.nav-rail__toggle {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 48px;
+  height: 48px;
+  min-width: 48px;
+  border: none;
+  border-radius: 50%;
+  background: transparent;
+  color: var(--cc-on-surface);
+  cursor: pointer;
+  transition: background-color 150ms ease;
+
+  &:hover {
+    background-color: rgba(255, 255, 255, 0.08);
+  }
+
+  &:focus-visible {
+    outline: 3px solid var(--status-active);
+    outline-offset: 2px;
+  }
+}
+
+.nav-rail__brand {
+  font-size: 18px;
+  font-weight: 600;
+  color: var(--status-active);
+  white-space: nowrap;
+  letter-spacing: 0.02em;
+}
+
+.nav-rail__nav {
+  flex: 1;
+  padding-top: 8px;
+
+  // Override Angular Material list item styles for compact nav rail items
+  --mat-list-list-item-one-line-vertical-gap: 4px;
+}
+
+.nav-rail__item {
+  display: flex;
+  align-items: center;
+  gap: 16px;
+  min-height: 56px;
+  padding: 0 12px;
+  border-radius: 28px;
+  margin: 2px 12px;
+  color: var(--cc-on-surface-variant);
+  text-decoration: none;
+  transition: background-color 150ms ease, color 150ms ease;
+
+  &:hover {
+    background-color: rgba(255, 255, 255, 0.08);
+    color: var(--cc-on-surface);
+  }
+
+  &--active {
+    background-color: var(--status-active-bg);
+    color: var(--status-active);
+
+    .nav-rail__label {
+      font-weight: 500;
+    }
+  }
+}
+
+.nav-rail__label {
+  font-size: 14px;
+  font-weight: 400;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+// ---------------------------------------------------------------------------
+// Medium (600–1023px): Show collapsed nav rail (icon-only)
+// ---------------------------------------------------------------------------
+@media (min-width: 600px) and (max-width: 1023px) {
+  .nav-rail {
+    display: flex;
+    width: var(--cc-nav-rail-collapsed-width);
+  }
+
+  // Always collapsed on medium — hide labels
+  .nav-rail__brand,
+  .nav-rail__label {
+    display: none;
+  }
+
+  .nav-rail__header {
+    justify-content: center;
+    padding: 16px 0;
+  }
+
+  .nav-rail__item {
+    justify-content: center;
+    padding: 0;
+    margin: 2px 8px;
+  }
+
+  // Disable expand on medium
+  .nav-rail--expanded {
+    width: var(--cc-nav-rail-collapsed-width);
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Expanded (≥1024px): Full expandable nav rail
+// ---------------------------------------------------------------------------
+@media (min-width: 1024px) {
+  .nav-rail {
+    display: flex;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Accessibility: Reduced Motion
+// ---------------------------------------------------------------------------
+@media (prefers-reduced-motion: reduce) {
+  .nav-rail {
+    transition: none;
+  }
+}