feat: 夜间模式优化

source/css/_extend.styl

@@ -5,7 +5,6 @@ $block-caption
   color: var(--color-grey)
   margin-bottom: 10px
   line-height: 1em
-  text-shadow: 0 1px #fff
   font-weight: bold
 
 $block

source/css/_partial/article.styl

@@ -26,7 +26,6 @@ $article-meta-tag
   padding: 10px 18px
   margin: 0 12px 1em
   box-shadow: 0 0 5px 3px var(--color-meta-shadow)
-  text-shadow: 0 1px #fff
 
 .article-date
   display: flex
@@ -201,7 +200,6 @@ $article-meta-tag
   border-radius: 15px
   background: var(--red-5)
   color: var(--red-1)
-  text-shadow: 0 1px #fff
   text-decoration: none
   box-shadow: 0 0 5px 3px var(--red-6)
 
@@ -374,7 +372,6 @@ $article-share-link
   float: left
   position: relative
   color: #999
-  text-shadow: 0 1px #fff
 
   &:before
     font-size: 20px

source/css/_variables.styl

@@ -42,9 +42,9 @@
     --red-1: #ff5252
     --red-2: #ff7c7c
     --red-3: #ffafaf
-    --red-4: #ffd0d0
-    --red-5: #ffe4e4
-    --red-5-5: #ffecec
+    --red-4: rgba(255,208,208,0.5)
+    --red-5: rgba(255,228,228,0.2)
+    --red-5-5: rgba(255,236,236,0.1)
     --red-6: #fff3f3
 
     --color-default-font: #999
@@ -54,7 +54,7 @@
     --color-link: var(--red-1)
     --color-dark-link: darken(#ff5252, 20%)
     --color-background: #21252b
-    --color-code-background: #e8e8e8
+    --color-code-background: rgba(232,232,232,0.2)
     --color-sidebar-text: #777
     --color-header-background: #222222
     --color-footer-background: #21252b
@@ -69,8 +69,8 @@
     --color-dark-pinterest: darken(#cb2027, 20%)
     --color-dark-linkedin: darken(#0077B5, 20%)
 
-    --color-meta-shadow: rgba(0, 0, 0, 0.3)
-    --color-hover-shadow: rgba(0, 0, 0, 0.3)
+    --color-meta-shadow: rgba(0, 0, 0, 0.2)
+    --color-hover-shadow: rgba(0, 0, 0, 0.2)
     --color-h2-after: #ff5252
     --color-h2-after-shadow: rgba(255, 78, 106, 0.7)
     img