tweak

index.html

@@ -94,7 +94,35 @@
           <h2>State lifespans</h2>
           <span id="historyRange">-</span>
         </div>
-        <canvas id="stateGraph" width="300" height="720" aria-label="State lifespan graph"></canvas>
+        <div class="history-controls">
+          <select id="historyFilter" aria-label="State graph filter">
+            <option value="all">All</option>
+            <option value="active">Living</option>
+            <option value="ended">Past</option>
+          </select>
+          <select id="historySort" aria-label="State graph sort">
+            <option value="important">Important</option>
+            <option value="active">Active</option>
+            <option value="oldest">Oldest</option>
+            <option value="strongest">Strongest</option>
+            <option value="largest">Largest</option>
+          </select>
+          <select id="historyMetric" aria-label="State graph metric">
+            <option value="power">Power</option>
+            <option value="population">Population</option>
+            <option value="cities">Cities</option>
+            <option value="loyalty">Loyalty</option>
+          </select>
+        </div>
+        <div class="history-group-controls" aria-label="State graph groups">
+          <button id="toggleActiveStates" type="button" aria-pressed="true">Living</button>
+          <button id="togglePastStates" type="button" aria-pressed="true">Past</button>
+        </div>
+        <div class="state-graph-scroll">
+          <canvas id="stateGraph" width="300" height="720" aria-label="State lifespan graph"></canvas>
+          <div id="stateGraphTooltip" class="state-graph-tooltip" hidden></div>
+        </div>
+        <div id="stateGraphInfo" class="state-graph-info">Hover a row for details</div>
       </section>
     </aside>
   </main>

styles.css

@@ -90,17 +90,94 @@ select {
   font-variant-numeric: tabular-nums;
 }
 
-#stateGraph {
-  display: block;
-  width: 100%;
-  flex: 1;
-  min-height: 420px;
+.history-controls,
+.history-group-controls {
+  display: grid;
+  gap: 6px;
+  margin-bottom: 8px;
+}
+
+.history-controls {
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+}
+
+.history-controls select,
+.history-group-controls button {
+  min-width: 0;
   border: 1px solid var(--line);
   border-radius: 6px;
   background: #101315;
+  color: var(--text);
+  font-size: 11px;
+  height: 28px;
+}
+
+.history-group-controls {
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+}
+
+.history-group-controls button[aria-pressed="false"] {
+  color: var(--muted);
+  background: #171b1d;
+}
+
+#stateGraph {
+  display: block;
+  width: 100%;
+  height: auto;
+  border: 0;
+  background: #101315;
   image-rendering: auto;
 }
 
+.state-graph-scroll {
+  position: relative;
+  flex: 1;
+  min-height: 0;
+  overflow-y: auto;
+  overflow-x: hidden;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  background: #101315;
+}
+
+.state-graph-tooltip {
+  position: absolute;
+  z-index: 2;
+  max-width: min(240px, calc(100% - 16px));
+  padding: 7px 9px;
+  border: 1px solid #435057;
+  border-radius: 6px;
+  background: rgba(15, 18, 20, 0.50);
+  color: var(--text);
+  font-size: 11px;
+  line-height: 1.3;
+  pointer-events: none;
+  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
+}
+
+.state-graph-tooltip strong {
+  display: block;
+  margin-bottom: 4px;
+  font-size: 12px;
+}
+
+.state-graph-tooltip span {
+  display: block;
+  color: var(--muted);
+}
+
+.state-graph-info {
+  min-height: 18px;
+  margin-top: 7px;
+  color: var(--muted);
+  font-size: 11px;
+  line-height: 1.25;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
 .brand h1 {
   margin: 0 0 6px;
   font-size: 24px;
@@ -290,7 +367,7 @@ canvas#world {
   padding: 8px 10px;
   border: 1px solid #435057;
   border-radius: 6px;
-  background: rgba(15, 18, 20, 0.96);
+  background: rgba(15, 18, 20, 0.80);
   color: var(--text);
   font-size: 11px;
   line-height: 1.35;
@@ -300,10 +377,28 @@ canvas#world {
 
 .tooltip strong {
   display: block;
-  margin-bottom: 4px;
+  margin-bottom: 6px;
   font-size: 12px;
 }
 
+.tooltip section {
+  padding-top: 5px;
+  margin-top: 5px;
+  border-top: 1px solid rgba(168, 177, 170, 0.16);
+}
+
+.tooltip section:first-of-type {
+  margin-top: 0;
+}
+
+.tooltip h3 {
+  margin: 0 0 3px;
+  color: var(--text);
+  font-size: 10px;
+  font-weight: 700;
+  letter-spacing: 0;
+}
+
 .tooltip span {
   display: flex;
   justify-content: space-between;
@@ -311,6 +406,12 @@ canvas#world {
   color: var(--muted);
 }
 
+.tooltip em {
+  color: var(--text);
+  font-style: normal;
+  text-align: right;
+}
+
 @media (max-width: 1100px) {
   body {
     overflow: auto;
@@ -330,7 +431,7 @@ canvas#world {
   .history-sidebar {
     border-left: 0;
     border-top: 1px solid var(--line);
-    overflow: visible;
+    overflow: hidden;
   }
 
   .sim {
@@ -343,7 +444,7 @@ canvas#world {
     height: min(calc(100vw - 20px), 92vh);
   }
 
-  #stateGraph {
+  .state-graph-scroll {
     height: 420px;
     flex: none;
   }