diff --git a/src/components/home/Welcome.astro b/src/components/home/Welcome.astro
index 32a18f6..230c6c8 100644
--- a/src/components/home/Welcome.astro
+++ b/src/components/home/Welcome.astro
@@ -12,4 +12,18 @@
     .welcome-title {
         color: var(--text-site-title);
     }
+
+    /* 暗色主题 - 增强标题对比度，防止亮背景区域发灰 */
+    :global(.dark) .welcome-title {
+        text-shadow:
+            0 2px 8px rgba(0, 0, 0, 0.45),
+            0 4px 16px rgba(0, 0, 0, 0.25);
+    }
+
+    /* 亮色主题 - 轻微阴影增强可读性 */
+    :global(.light) .welcome-title {
+        text-shadow:
+            0 1px 4px rgba(255, 255, 255, 0.6),
+            0 2px 8px rgba(0, 0, 0, 0.08);
+    }
 </style>
diff --git a/src/layouts/base/BaseLayout.astro b/src/layouts/base/BaseLayout.astro
index a0f4214..f20fe9a 100644
--- a/src/layouts/base/BaseLayout.astro
+++ b/src/layouts/base/BaseLayout.astro
@@ -95,12 +95,25 @@ const coverImageUrlStr = coverImageUrl
         background-image: var(--coverImageUrlStr);
     }
 
-    /* 遮罩层使用伪元素，颜色从 theme.css 动态加载 */
+    /* 遮罩层使用伪元素：上浅下深渐变 + 暗角效果 */
     .solitude-body::before {
         content: '';
         position: absolute;
         inset: 0;
-        background-color: var(--site-bg-overlay);
+        background:
+            /* 径向暗角 - 四周略深，聚焦视觉中心 */
+            radial-gradient(
+                ellipse 120% 100% at 50% 50%,
+                transparent 0%,
+                transparent 50%,
+                var(--site-bg-vignette) 100%
+            ),
+            /* 上浅下深线性渐变 - 让下半屏卡片对比更稳定 */
+            linear-gradient(
+                    to bottom,
+                    var(--site-bg-overlay-top) 0%,
+                    var(--site-bg-overlay-bottom) 100%
+                );
         pointer-events: none;
     }
 </style>
diff --git a/src/styles/theme/dark/card.css b/src/styles/theme/dark/card.css
index 9aede49..f868332 100644
--- a/src/styles/theme/dark/card.css
+++ b/src/styles/theme/dark/card.css
@@ -3,8 +3,10 @@
  */
 
 .dark {
-    /* 网站背景遮罩 */
-    --site-bg-overlay: rgba(0, 0, 0, 0.55);
+    /* 网站背景遮罩 - 上浅下深渐变 + 暗角 */
+    --site-bg-overlay-top: rgba(0, 0, 0, 0.35);
+    --site-bg-overlay-bottom: rgba(0, 0, 0, 0.68);
+    --site-bg-vignette: rgba(0, 0, 0, 0.18);
 
     /* 首页文章卡片覆盖层渐变 */
     --home-card-overlay-start: oklch(0.12 0.025 264.665 / 0.45);
diff --git a/src/styles/theme/light/card.css b/src/styles/theme/light/card.css
index ee442c3..fb9a314 100644
--- a/src/styles/theme/light/card.css
+++ b/src/styles/theme/light/card.css
@@ -3,8 +3,10 @@
  */
 
 :root {
-    /* 网站背景遮罩 */
-    --site-bg-overlay: rgba(180, 180, 185, 0.65);
+    /* 网站背景遮罩 - 上浅下深渐变 + 暗角 */
+    --site-bg-overlay-top: rgba(240, 240, 242, 0.45);
+    --site-bg-overlay-bottom: rgba(180, 180, 185, 0.72);
+    --site-bg-vignette: rgba(100, 100, 105, 0.12);
 
     /* 首页文章卡片覆盖层渐变 */
     --home-card-overlay-start: oklch(0.98 0 0 / 0.55);