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frontend/src/app/layout/header-bar/header-bar.component.scss

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+// ============================================================================
+// Header Bar — Top App Bar
+// Per spec Section 3.1: 64px tall, M3 MediumTopAppBar on expanded
+// Section 3.2: SmallTopAppBar on mobile
+// ============================================================================
+
+.header-bar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  height: var(--cc-header-height);
+  padding: 0 var(--cc-section-padding);
+  background-color: var(--cc-surface-container-high);
+  border-bottom: 1px solid var(--cc-outline);
+  z-index: 20;
+}
+
+.header-bar__title {
+  font-size: 28px;
+  font-weight: 400;
+  color: var(--cc-on-surface);
+  margin: 0;
+  letter-spacing: -0.01em;
+}
+
+.header-bar__actions {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.header-bar__action-btn {
+  color: var(--cc-on-surface-variant) !important;
+
+  &:hover {
+    color: var(--cc-on-surface) !important;
+  }
+}
+
+.header-bar__live-dot {
+  display: inline-block;
+  width: 10px;
+  height: 10px;
+  border-radius: 50%;
+  margin-right: 6px;
+  background-color: var(--status-error);
+  vertical-align: middle;
+
+  &--connected {
+    background-color: var(--status-active);
+    animation: pulse-active 2s ease-in-out infinite;
+  }
+}
+
+.header-bar__live-label {
+  font-size: 13px;
+  font-weight: 500;
+  color: var(--cc-on-surface-variant);
+  vertical-align: middle;
+}
+
+// Mobile: smaller title
+@media (max-width: 599px) {
+  .header-bar {
+    padding: 0 16px;
+  }
+
+  .header-bar__title {
+    font-size: 22px;
+    font-weight: 500;
+  }
+
+  .header-bar__live-label {
+    display: none; // Space saving on mobile — dot alone is enough
+  }
+}