ui: polish voting results chart

frontend/src/components/voting/VotingResultsChart.astro

@@ -41,6 +41,7 @@ const { proposalId, apiBase = '' } = Astro.props;
     private data: any;
     private apiBase: string;
     private enabled = false;
+    private tooltip?: HTMLElement;
 
     constructor(container: HTMLElement) {
       this.container = container;
@@ -161,9 +162,10 @@ const { proposalId, apiBase = '' } = Astro.props;
         const isWinner = index === 0;
 
         const safeLabel = this.escapeHtml(result.label);
+        const safeValue = this.escapeHtml(this.formatScore(score, method));
 
         return `
-          <div class="result-bar ${isWinner ? 'winner' : ''}" style="--bar-delay: ${index * 0.1}s">
+          <div class="result-bar ${isWinner ? 'winner' : ''}" style="--bar-delay: ${index * 0.1}s" tabindex="0" data-label="${safeLabel}" data-value="${safeValue}">
             <div class="bar-header">
               <span class="bar-rank">#${result.rank || index + 1}</span>
               <span class="bar-label">${safeLabel}</span>
@@ -187,8 +189,11 @@ const { proposalId, apiBase = '' } = Astro.props;
         <div class="bars-container">
           ${barsHtml}
         </div>
+        <div class="chart-tooltip" id="chart-tooltip" aria-hidden="true"></div>
       `;
 
+      this.attachChartInteractions(chartArea);
+
       // Trigger animation
       setTimeout(() => {
         chartArea.querySelectorAll<HTMLElement>('.bar-fill').forEach((bar) => {
@@ -197,6 +202,54 @@ const { proposalId, apiBase = '' } = Astro.props;
       }, 100);
     }
 
+    attachChartInteractions(chartArea: HTMLElement): void {
+      const tooltip = chartArea.querySelector<HTMLElement>('#chart-tooltip');
+      if (!tooltip) return;
+      this.tooltip = tooltip;
+
+      const show = (bar: HTMLElement) => {
+        if (!this.tooltip) return;
+        const label = bar.dataset.label || '';
+        const value = bar.dataset.value || '';
+        this.tooltip.textContent = `${label} • ${value}`;
+        this.tooltip.setAttribute('aria-hidden', 'false');
+        this.tooltip.classList.add('is-visible');
+
+        const rect = bar.getBoundingClientRect();
+        const left = Math.max(12, Math.min(window.innerWidth - 12, rect.left + rect.width * 0.35));
+        const top = Math.max(12, rect.top - 10);
+        this.tooltip.style.left = `${left}px`;
+        this.tooltip.style.top = `${top}px`;
+      };
+
+      const hide = () => {
+        if (!this.tooltip) return;
+        this.tooltip.setAttribute('aria-hidden', 'true');
+        this.tooltip.classList.remove('is-visible');
+      };
+
+      chartArea.addEventListener('mouseover', (e) => {
+        const target = e.target as HTMLElement | null;
+        const bar = target?.closest?.('.result-bar') as HTMLElement | null;
+        if (bar) show(bar);
+      });
+
+      chartArea.addEventListener('mouseout', (e) => {
+        const related = (e as MouseEvent).relatedTarget as HTMLElement | null;
+        if (!related || !related.closest?.('.result-bar')) hide();
+      });
+
+      chartArea.addEventListener('focusin', (e) => {
+        const target = e.target as HTMLElement | null;
+        const bar = target?.closest?.('.result-bar') as HTMLElement | null;
+        if (bar) show(bar);
+      });
+
+      chartArea.addEventListener('focusout', () => {
+        hide();
+      });
+    }
+
     renderDetails(): void {
       const detailsArea = this.container.querySelector<HTMLElement>('#details-area');
       const roundsArea = this.container.querySelector<HTMLElement>('#rounds-area');
@@ -366,7 +419,7 @@ const { proposalId, apiBase = '' } = Astro.props;
 
 <style>
   .results-chart {
-    background: var(--color-surface);
+    background: rgba(255, 255, 255, 0.03);
     border-radius: 16px;
     padding: 1.5rem;
     border: 1px solid var(--color-border);
@@ -411,6 +464,7 @@ const { proposalId, apiBase = '' } = Astro.props;
     border-radius: 12px;
     min-width: 100px;
     gap: 0.25rem;
+    border: 1px solid rgba(255, 255, 255, 0.04);
   }
 
   .stat-card svg {
@@ -421,6 +475,7 @@ const { proposalId, apiBase = '' } = Astro.props;
   .stat-card.winner {
     background: linear-gradient(135deg, var(--color-warning) 0%, #f97316 100%);
     color: white;
+    border-color: rgba(255, 255, 255, 0.15);
   }
 
   .stat-card.winner svg {
@@ -443,82 +498,31 @@ const { proposalId, apiBase = '' } = Astro.props;
     display: flex;
     align-items: center;
     gap: 0.75rem;
-    margin-bottom: 1.25rem;
+    margin-bottom: 1.5rem;
+    padding-bottom: 0.75rem;
+    border-bottom: 1px solid var(--color-border);
   }
 
   .chart-header svg {
     color: var(--color-primary);
   }
 
-  .chart-header h3 {
-    margin: 0;
-    font-size: 1.125rem;
-  }
-
-  .bars-container {
-    display: flex;
-    flex-direction: column;
-    gap: 0.75rem;
-  }
-
-  .result-bar {
-    animation: fadeInUp 0.3s ease forwards;
-    animation-delay: var(--bar-delay, 0s);
-    opacity: 0;
-  }
-
-  @keyframes fadeInUp {
-    from {
-      opacity: 0;
-      transform: translateY(10px);
-    }
-    to {
-      opacity: 1;
-      transform: translateY(0);
-    }
-  }
-
-  .bar-header {
-    display: flex;
-    align-items: center;
-    gap: 0.5rem;
-    margin-bottom: 0.375rem;
-  }
-
-  .bar-rank {
-    font-size: 0.75rem;
-    font-weight: 600;
-    color: var(--color-text-muted);
-    min-width: 24px;
-  }
-
-  .bar-label {
-    font-weight: 500;
-    color: var(--color-text);
-    flex: 1;
-  }
-
-  .winner-icon {
-    color: var(--color-warning);
-    width: 1.25rem;
-    height: 1.25rem;
-  }
-
   .bar-track {
     height: 32px;
     background: var(--color-bg);
-    border-radius: 8px;
+    border-radius: 16px;
     overflow: hidden;
+    border: 1px solid rgba(255, 255, 255, 0.04);
     position: relative;
   }
 
   .bar-fill {
     height: 100%;
+    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
+    border-radius: 16px;
     width: 0;
-    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
+    transition: width 0.8s ease;
-    border-radius: 8px;
+    box-shadow: 0 10px 24px rgba(59, 130, 246, 0.14);
-    display: flex;
-    align-items: center;
     justify-content: flex-end;
     padding-right: 0.75rem;
     transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
@@ -530,6 +534,48 @@ const { proposalId, apiBase = '' } = Astro.props;
 
   .result-bar.winner .bar-fill {
     background: linear-gradient(90deg, var(--color-warning) 0%, #f97316 100%);
+    box-shadow: 0 10px 24px rgba(249, 115, 22, 0.18);
+  }
+
+  .chart-tooltip {
+    position: fixed;
+    z-index: 50;
+    left: 0;
+    top: 0;
+    transform: translate(-50%, -100%);
+    padding: 0.5rem 0.75rem;
+    border-radius: 999px;
+    background: rgba(0, 0, 0, 0.72);
+    color: rgba(255, 255, 255, 0.95);
+    border: 1px solid rgba(255, 255, 255, 0.12);
+    font-size: 0.8125rem;
+    letter-spacing: 0.01em;
+    pointer-events: none;
+    opacity: 0;
+    transition: opacity 120ms ease;
+  }
+
+  .chart-tooltip.is-visible {
+    opacity: 1;
+  }
+
+  @media (max-width: 640px) {
+    .results-chart {
+      padding: 1rem;
+    }
+
+    .chart-header {
+      margin-bottom: 1rem;
+    }
+
+    .bar-track {
+      height: 28px;
+    }
+
+    .bar-header {
+      gap: 0.5rem;
+      flex-wrap: wrap;
+    }
   }
 
   .bar-value {