diff --git a/frontend/src/views/dashboard/components/RequestHealthTimelineCard.vue b/frontend/src/views/dashboard/components/RequestHealthTimelineCard.vue
index 7e7983dd7..26e85d052 100644
--- a/frontend/src/views/dashboard/components/RequestHealthTimelineCard.vue
+++ b/frontend/src/views/dashboard/components/RequestHealthTimelineCard.vue
@@ -286,13 +286,6 @@ onBeforeUnmount(() => {
                         : undefined,
                   ]"
                 />
-                <span
-                  aria-hidden="true"
-                  class="pointer-events-none absolute bottom-0 left-1/2 h-0.75 w-1.5 -translate-x-1/2 rounded-full bg-(--cp-text-primary) transition-[opacity,transform] duration-200 ease-[cubic-bezier(0.22,1,0.36,1)] motion-reduce:transition-none"
-                  :class="
-                    isActivePoint(point) ? 'translate-y-0 opacity-60' : 'translate-y-1 opacity-0'
-                  "
-                />
               </button>
             </div>
           </template>
diff --git a/frontend/src/views/dashboard/components/RequestTrendCard.vue b/frontend/src/views/dashboard/components/RequestTrendCard.vue
index 3cad70921..d0727362b 100644
--- a/frontend/src/views/dashboard/components/RequestTrendCard.vue
+++ b/frontend/src/views/dashboard/components/RequestTrendCard.vue
@@ -29,9 +29,7 @@ const tabs = [
 const activeKind = defineModel<TrendKind>('kind', { required: true })
 const { themeRevision } = storeToRefs(useUiStore())
 const preferredMotion = usePreferredReducedMotion()
-const hoveredSummaryLabel = shallowRef<string>()
 const pinnedSummaryLabel = shallowRef<string>()
-const activeSummaryLabel = computed(() => hoveredSummaryLabel.value ?? pinnedSummaryLabel.value)
 
 const hasSamples = computed(() =>
   props.points.some(
@@ -390,12 +388,7 @@ function lineSeries(name: string, data: (number | null)[], color: string, option
       opacity: muted ? 0.18 : 1,
     },
     itemStyle: { color, opacity: muted ? 0.18 : 1 },
-    emphasis: { focus: 'series' as const },
-    blur: {
-      lineStyle: { opacity: 0.2 },
-      itemStyle: { opacity: 0.2 },
-      areaStyle: { opacity: 0.05 },
-    },
+    emphasis: { disabled: true },
     areaStyle: area
       ? {
           opacity: muted ? 0.12 : 1,
@@ -432,8 +425,7 @@ function barSeries(name: string, data: (number | null)[], color: string, options
       opacity: muted ? 0.14 : (options.opacity ?? 0.72),
       borderRadius: options.borderRadius ?? [3, 3, 0, 0],
     },
-    emphasis: { focus: 'series' as const },
-    blur: { itemStyle: { opacity: 0.18 } },
+    emphasis: { disabled: true },
   }
 }
 
@@ -450,28 +442,19 @@ function handleTrendChange(value: string) {
   emit('trendChange', value as TrendKind)
 }
 
-function focusSummarySeries(label: string) {
-  hoveredSummaryLabel.value = label
-}
-
-function blurSummarySeries() {
-  hoveredSummaryLabel.value = undefined
-}
-
 function toggleSummarySeries(label: string) {
   pinnedSummaryLabel.value = pinnedSummaryLabel.value === label ? undefined : label
 }
 
 function isSeriesMuted(name: string) {
-  return Boolean(activeSummaryLabel.value && activeSummaryLabel.value !== name)
+  return Boolean(pinnedSummaryLabel.value && pinnedSummaryLabel.value !== name)
 }
 
 function isSummarySeriesActive(label: string) {
-  return activeSummaryLabel.value === label
+  return pinnedSummaryLabel.value === label
 }
 
 watch(activeKind, () => {
-  hoveredSummaryLabel.value = undefined
   pinnedSummaryLabel.value = undefined
 })
 </script>
@@ -499,10 +482,6 @@ watch(activeKind, () => {
             :aria-label="`突出显示${item.label}曲线`"
             :aria-pressed="pinnedSummaryLabel === item.label"
             class="group grid min-w-0 grid-cols-[8px_minmax(0,1fr)] items-center gap-x-2 rounded-lg border-0 bg-transparent px-2.5 py-2 text-left outline-none focus-visible:ring-2 focus-visible:ring-(--cp-info-border)"
-            @mouseenter="focusSummarySeries(item.label)"
-            @mouseleave="blurSummarySeries"
-            @focus="focusSummarySeries(item.label)"
-            @blur="blurSummarySeries"
             @click="toggleSummarySeries(item.label)"
           >
             <i
diff --git a/frontend/src/views/login/index.vue b/frontend/src/views/login/index.vue
index 8b4affab8..1b43798ba 100644
--- a/frontend/src/views/login/index.vue
+++ b/frontend/src/views/login/index.vue
@@ -77,7 +77,7 @@ async function handleSubmit(): Promise<void> {
   --login-route-stream: color-mix(in srgb, var(--cp-info) 17%, transparent);
   --login-route-audit: color-mix(in srgb, var(--cp-text-tertiary) 18%, transparent);
   --login-semantic: color-mix(in srgb, var(--cp-info) 26%, transparent);
-  --login-particle: color-mix(in srgb, var(--cp-info) 76%, var(--cp-normal));
+  --login-particle: var(--cp-accent-primary);
   --login-particle-glow: color-mix(in srgb, var(--cp-info) 62%, transparent);
   --login-watermark: color-mix(in srgb, var(--cp-text-primary) 55%, transparent);
   --login-stack-text: color-mix(in srgb, var(--cp-text-primary) 84%, transparent);
@@ -94,7 +94,7 @@ async function handleSubmit(): Promise<void> {
   --login-form-shadow: color-mix(in srgb, var(--cp-text-primary) 20%, transparent);
   --login-form-line: color-mix(in srgb, var(--cp-info-border) 54%, transparent);
   --login-logo-bg: color-mix(in srgb, var(--cp-info-bg) 74%, var(--cp-bg-surface));
-  --login-logo-text: color-mix(in srgb, var(--cp-info) 72%, var(--cp-normal));
+  --login-logo-text: var(--cp-accent-primary);
   --login-title: var(--cp-text-primary);
   --login-brand-title: var(--cp-text-strong);
   --login-brand-caption: var(--cp-text-secondary);
@@ -112,10 +112,10 @@ async function handleSubmit(): Promise<void> {
   --login-error-bg: var(--cp-danger-bg);
   --login-error-icon: var(--cp-danger);
   --login-error-text: var(--cp-danger-text);
-  --login-button: color-mix(in srgb, var(--cp-info) 74%, var(--cp-normal));
-  --login-button-hover: color-mix(in srgb, var(--cp-info-hover) 74%, var(--cp-normal-hover));
-  --login-button-active: color-mix(in srgb, var(--cp-info-pressed) 74%, var(--cp-normal-pressed));
-  --login-button-shadow: color-mix(in srgb, var(--cp-info) 30%, transparent);
+  --login-button: var(--cp-accent-primary);
+  --login-button-hover: var(--cp-info-hover);
+  --login-button-active: var(--cp-info-pressed);
+  --login-button-shadow: color-mix(in srgb, var(--cp-accent-primary) 30%, transparent);
   --login-footer: color-mix(in srgb, var(--cp-text-secondary) 82%, var(--cp-text-tertiary));
   --login-toggle-bg: color-mix(in srgb, var(--cp-bg-muted) 74%, transparent);
   --login-toggle-sun: var(--login-logo-text);
diff --git a/frontend/src/views/usage/components/UsageCostCard.vue b/frontend/src/views/usage/components/UsageCostCard.vue
index e53b411ae..d9f3f43a4 100644
--- a/frontend/src/views/usage/components/UsageCostCard.vue
+++ b/frontend/src/views/usage/components/UsageCostCard.vue
@@ -60,7 +60,7 @@ const chartOption = computed<EChartsOption>(() => {
 
   return {
     animationDuration: 240,
-    grid: { left: 52, right: 12, top: 40, bottom: 28 },
+    grid: { left: 0, right: 0, top: 40, bottom: 0, containLabel: true },
     legend: {
       top: 0,
       right: 4,
diff --git a/frontend/src/views/usage/components/UsageDiagnosticCard.vue b/frontend/src/views/usage/components/UsageDiagnosticCard.vue
index 10e9ea4ad..0c1b45284 100644
--- a/frontend/src/views/usage/components/UsageDiagnosticCard.vue
+++ b/frontend/src/views/usage/components/UsageDiagnosticCard.vue
@@ -3,6 +3,7 @@ import { CornerDownRight } from '@lucide/vue'
 import { computed } from 'vue'
 
 import BaseCard from '@/components/base/BaseCard.vue'
+import BaseEmpty from '@/components/base/BaseEmpty.vue'
 import BaseSegmented from '@/components/base/BaseSegmented.vue'
 import BaseTable from '@/components/base/BaseTable/index.vue'
 
@@ -84,6 +85,7 @@ const displayItems = computed(() =>
     nameDisplay: diagnosticNameDisplay(item.name),
   })),
 )
+const hasData = computed(() => !props.loading && displayItems.value.length > 0)
 
 function diagnosticNameDisplay(name: string) {
   const raw = name.trim() || '未知'
@@ -117,17 +119,18 @@ function diagnosticNameDisplay(name: string) {
       <BaseSegmented
         v-model="dimension"
         :options="dimensionOptions"
+        :disabled="loading"
         class="w-full min-w-0 lg:w-80"
       />
     </template>
 
     <template #body>
       <BaseTable
+        v-if="hasData"
         :key="resultDimension"
         class="min-h-0 w-full"
         :columns="diagnosticColumns"
         :rows="displayItems"
-        :loading="loading"
         compact
         row-key="name"
         empty-text="暂无诊断数据"
@@ -204,6 +207,14 @@ function diagnosticNameDisplay(name: string) {
           </span>
         </template>
       </BaseTable>
+      <BaseEmpty
+        v-else
+        compact
+        plain
+        :title="loading ? '正在加载热点诊断数据' : '暂无诊断数据'"
+        description="当前范围没有可诊断的请求记录"
+        class="h-full place-content-center"
+      />
     </template>
   </BaseCard>
 </template>
diff --git a/frontend/src/views/usage/components/UsageHealthCard.vue b/frontend/src/views/usage/components/UsageHealthCard.vue
index a70ae0a12..a5a02c747 100644
--- a/frontend/src/views/usage/components/UsageHealthCard.vue
+++ b/frontend/src/views/usage/components/UsageHealthCard.vue
@@ -56,7 +56,7 @@ const chartOption = computed<EChartsOption>(() => {
 
   return {
     animationDuration: 240,
-    grid: { left: 48, right: 44, top: 40, bottom: 28 },
+    grid: { left: 0, right: 0, top: 40, bottom: 0, containLabel: true },
     legend: {
       top: 0,
       right: 4,
diff --git a/frontend/src/views/usage/components/UsagePerformanceCard.vue b/frontend/src/views/usage/components/UsagePerformanceCard.vue
index d21e1d551..88c5abd61 100644
--- a/frontend/src/views/usage/components/UsagePerformanceCard.vue
+++ b/frontend/src/views/usage/components/UsagePerformanceCard.vue
@@ -65,7 +65,7 @@ const chartOption = computed<EChartsOption>(() => {
 
   return {
     animationDuration: 240,
-    grid: { left: 52, right: 12, top: 40, bottom: 28 },
+    grid: { left: 0, right: 0, top: 40, bottom: 0, containLabel: true },
     legend: {
       top: 0,
       right: 4,
diff --git a/frontend/src/views/usage/constants.ts b/frontend/src/views/usage/constants.ts
index d93c90301..2027bad42 100644
--- a/frontend/src/views/usage/constants.ts
+++ b/frontend/src/views/usage/constants.ts
@@ -72,7 +72,7 @@ export const usageRecordColumns = [
   {
     key: 'userAgent',
     label: 'User-Agent',
-    width: '300px',
+    width: '340px',
     ellipsis: false,
     cellClass:
       'whitespace-normal break-words text-[12px] leading-[1.45] font-[650] text-(--cp-text-secondary)',