Add multi-line scrollable chart and tooltip styles: enhance user interaction and visual feedback

web/client/src/components/AnalyticsPanel.css

@@ -168,6 +168,174 @@
   padding: 0.5rem 0.25rem 0.25rem;
 }
 
+/* ===== Multi-line Scrollable Chart ===== */
+.multiline-chart-container {
+  position: relative;
+  width: 100%;
+  -webkit-user-select: none;
+  user-select: none;
+}
+
+.multiline-chart-container.dragging {
+  cursor: grabbing;
+}
+
+.multiline-chart-container:not(.dragging) {
+  cursor: crosshair;
+}
+
+/* Tooltip */
+.chart-tooltip {
+  position: absolute;
+  background: #1a1a1acc;
+  border: 1px solid #555;
+  border-radius: 2px;
+  padding: 0.375rem 0.5rem;
+  pointer-events: none;
+  z-index: 30;
+  min-width: 100px;
+  -webkit-backdrop-filter: blur(4px);
+  backdrop-filter: blur(4px);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.6);
+}
+
+.chart-tooltip-time {
+  font-size: 0.5rem;
+  color: var(--mc-text-gray);
+  font-weight: 700;
+  margin-bottom: 0.25rem;
+  text-transform: uppercase;
+  letter-spacing: 0.04em;
+  border-bottom: 1px solid #333;
+  padding-bottom: 0.2rem;
+}
+
+.chart-tooltip-row {
+  display: flex;
+  align-items: center;
+  gap: 0.3rem;
+  font-size: 0.5rem;
+  padding: 0.1rem 0;
+}
+
+.chart-tooltip-dot {
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  flex-shrink: 0;
+}
+
+.chart-tooltip-name {
+  color: var(--mc-text-gray);
+  flex: 1;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  max-width: 80px;
+}
+
+.chart-tooltip-val {
+  color: var(--mc-text-white);
+  font-weight: 700;
+  text-shadow: 1px 1px 0 #000;
+}
+
+/* Scrollbar */
+.chart-scrollbar {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.375rem 0 0.125rem;
+}
+
+.chart-scrollbar-track {
+  flex: 1;
+  height: 6px;
+  background: #222;
+  border: 1px solid #333;
+  border-radius: 3px;
+  position: relative;
+  overflow: hidden;
+}
+
+.chart-scrollbar-thumb {
+  position: absolute;
+  top: 0;
+  height: 100%;
+  background: linear-gradient(90deg, #555, #666);
+  border-radius: 3px;
+  transition: background 0.15s;
+  min-width: 12px;
+}
+
+.chart-scrollbar-thumb:hover,
+.multiline-chart-container.dragging .chart-scrollbar-thumb {
+  background: linear-gradient(90deg, #777, #888);
+}
+
+.chart-scrollbar-hint {
+  font-size: 0.4rem;
+  color: #444;
+  text-transform: uppercase;
+  white-space: nowrap;
+  letter-spacing: 0.03em;
+}
+
+/* ===== Tracked Items Chips Bar ===== */
+.tracked-items-bar {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.375rem;
+  margin-bottom: 0.5rem;
+}
+
+.tracked-chip {
+  display: flex;
+  align-items: center;
+  gap: 0.25rem;
+  padding: 0.2rem 0.4rem;
+  background: #2a2a2a;
+  border: 1px solid #555;
+  border-radius: 2px;
+  font-size: 0.5rem;
+  color: var(--mc-text-white);
+  transition: border-color 0.15s, background 0.15s;
+}
+
+.tracked-chip:hover {
+  background: #333;
+}
+
+.tracked-chip-dot {
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  flex-shrink: 0;
+}
+
+.tracked-chip-name {
+  max-width: 80px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.tracked-chip-remove {
+  background: none;
+  border: none;
+  color: #666;
+  font-size: 0.55rem;
+  cursor: pointer;
+  padding: 0 0.15rem;
+  font-family: 'Silkscreen', monospace;
+  line-height: 1;
+  transition: color 0.15s;
+}
+
+.tracked-chip-remove:hover {
+  color: var(--mc-text-red);
+}
+
 .svg-chart {
   display: block;
   width: 100%;