Update app.py

app.py

@@ -1380,60 +1380,122 @@ else:
         # ===============================================================
         st.subheader("Hazard Gradient Legend")
         st.markdown("""
-        <div class="legend-container">
-            <div class="legend-box">
-                <div class="legend-title">Worsening Trends (Positive Slope):</div>
-                <div class="legend-item">
-                    <div class="legend-color" style="background-color: #d32f2f;"></div>
-                    <span>Very High Worsening (≥1.5)</span>
-                </div>
-                <div class="legend-item">
-                    <div class="legend-color" style="background-color: #e57373;"></div>
-                    <span>High Worsening (1.0–1.5)</span>
-                </div>
-                <div class="legend-item">
-                    <div class="legend-color" style="background-color: #ef9a9a;"></div>
-                    <span>Moderate Worsening (0.5–1.0)</span>
-                </div>
-                <div class="legend-item">
-                    <div class="legend-color" style="background-color: #ffcdd2;"></div>
-                    <span>Slight Worsening (0–0.5)</span>
-                </div>
-                <br>
-                <i>Note: Worsening trends indicate increasing fatigue frequency over weeks.</i>
-            </div>
-            <div class="legend-box">
-                <div class="legend-title">Improving Trends (Negative Slope):</div>
-                <div class="legend-item">
-                    <div class="legend-color" style="background-color: #388e3c;"></div>
-                    <span>Excellent Improvement (≤−1.5)</span>
-                </div>
-                <div class="legend-item">
-                    <div class="legend-color" style="background-color: #81c784;"></div>
-                    <span>Great Improvement (−1.5 to −1.0)</span>
-                </div>
-                <div class="legend-item">
-                    <div class="legend-color" style="background-color: #a5d6a7;"></div>
-                    <span>Good Improvement (−1.0 to −0.5)</span>
-                </div>
-                <div class="legend-item">
-                    <div class="legend-color" style="background-color: #c8e6c9;"></div>
-                    <span>Slight Improvement (−0.5 to 0)</span>
-                </div>
-                <br>
-                <i>Note: Improving trends indicate decreasing fatigue frequency over weeks.</i>
-            </div>
-            <div class="legend-box">
-                <div class="legend-title">One-Time Events (Zero Slope):</div>
-                <div class="legend-item">
-                    <div class="legend-color" style="background-color: #FFD700;"></div>
-                    <span>One Time Event (0)</span>
-                </div>
-                <br>
-                <i>Note: Applies when an operator has data in only one week — slope is set to 0 by definition.</i>
-            </div>
+<style>
+.legend-container {
+    display: flex;
+    gap: 20px;
+    margin-top: 10px;
+}
+.legend-box {
+    background-color: #fafafa;
+    border-radius: 12px;
+    padding: 15px 20px;
+    width: 32%;
+    border: 1px solid #e0e0e0;
+    box-shadow: 0px 2px 6px rgba(0,0,0,0.05);
+}
+.legend-title {
+    font-weight: 700;
+    margin-bottom: 12px;
+    color: #333;
+}
+.legend-item {
+    display: flex;
+    align-items: center;
+    margin-bottom: 6px;
+}
+.legend-color {
+    width: 18px;
+    height: 18px;
+    border-radius: 4px;
+    margin-right: 10px;
+    border: 1px solid #ccc;
+}
+.legend-note {
+    font-size: 12px;
+    color: #555;
+    font-style: italic;
+    margin-top: 10px;
+    display: block;
+}
+</style>
+
+<div class="legend-container">
+
+    <!-- WORSENING -->
+    <div class="legend-box">
+        <div class="legend-title">Worsening Trends (Positive Slope)</div>
+
+        <div class="legend-item">
+            <div class="legend-color" style="background-color: #d32f2f;"></div>
+            <span>Very High Worsening (≥ 1.5)</span>
         </div>
-        """, unsafe_allow_html=True)
+
+        <div class="legend-item">
+            <div class="legend-color" style="background-color: #e57373;"></div>
+            <span>High Worsening (1.0 – 1.5)</span>
+        </div>
+
+        <div class="legend-item">
+            <div class="legend-color" style="background-color: #ef9a9a;"></div>
+            <span>Moderate Worsening (0.5 – 1.0)</span>
+        </div>
+
+        <div class="legend-item">
+            <div class="legend-color" style="background-color: #ffcdd2;"></div>
+            <span>Slight Worsening (0 – 0.5)</span>
+        </div>
+
+        <span class="legend-note">
+            Worsening trends indicate increasing fatigue frequency over weeks.
+        </span>
+    </div>
+
+    <!-- IMPROVING -->
+    <div class="legend-box">
+        <div class="legend-title">Improving Trends (Negative Slope)</div>
+
+        <div class="legend-item">
+            <div class="legend-color" style="background-color: #388e3c;"></div>
+            <span>Excellent Improvement (≤ −1.5)</span>
+        </div>
+
+        <div class="legend-item">
+            <div class="legend-color" style="background-color: #81c784;"></div>
+            <span>Great Improvement (−1.5 to −1.0)</span>
+        </div>
+
+        <div class="legend-item">
+            <div class="legend-color" style="background-color: #a5d6a7;"></div>
+            <span>Good Improvement (−1.0 to −0.5)</span>
+        </div>
+
+        <div class="legend-item">
+            <div class="legend-color" style="background-color: #c8e6c9;"></div>
+            <span>Slight Improvement (−0.5 to 0)</span>
+        </div>
+
+        <span class="legend-note">
+            Improving trends indicate decreasing fatigue frequency over weeks.
+        </span>
+    </div>
+
+    <!-- ONE-TIME EVENT -->
+    <div class="legend-box">
+        <div class="legend-title">One-Time Events (Zero Slope)</div>
+
+        <div class="legend-item">
+            <div class="legend-color" style="background-color: #FFD700;"></div>
+            <span>One-Time Event (0)</span>
+        </div>
+
+        <span class="legend-note">
+            Occurs when an operator appears in only one week — slope is defined as 0.
+        </span>
+    </div>
+
+</div>
+""", unsafe_allow_html=True)
 
         # ===============================================================
         # PLOT FUNCTION — UPDATED: color for slope=0 is now #FFD700