视觉系统主干落地：对齐 design tokens 与核心组件样式向 Zibll 收敛

- tokens：收紧 surface 层级/边框/圆角/阴影/间距与暗黑基线
- 组件：按钮、卡片原语、导航、侧栏、分页、模态、浮动按钮
- 首页：hero 外壳、fixed 列表/宫格、tab、skeleton/error 及各运营模块卡片化
- 内容页：单篇封面/标题/正文/blockquote/相关/TOC/上一篇下一篇、评论区
- 社区：forum board/topic/compose 子控件与卡片体系
- 交易/认证：cart/orders/revenue/product/auth 表面块与模态浮层统一
- footer：页脚主体、社交/联系、移动端 tabbar/搜索覆盖

assets/css/frontend/single-post/cover.css

@@ -7,8 +7,9 @@
 .single-cover {
     position: relative;
     overflow: hidden;
-    border-radius: 8px;
-    margin-bottom: 16px;
+    border-radius: var(--radius-2xl, 16px);
+    box-shadow: var(--shadow-sm);
+    margin-bottom: 20px;
     padding-bottom: var(--single-cover-scale, 35%);
 }
 
@@ -37,9 +38,9 @@
     bottom: 0;
     left: 0;
     right: 0;
-    padding: 20px;
+    padding: 24px;
     color: #fff;
-    border-radius: 0 0 8px 8px;
+    border-radius: 0 0 var(--radius-2xl, 16px) var(--radius-2xl, 16px);
 }
 
 .single-cover__title,
@@ -112,24 +113,26 @@
 
 .single-cover__dots {
     position: absolute;
-    bottom: 12px;
-    right: 16px;
+    bottom: 14px;
+    right: 18px;
     display: flex;
-    gap: 6px;
+    gap: 8px;
     z-index: 2;
 }
 
 .single-cover__dot {
-    width: 8px;
-    height: 8px;
+    width: 9px;
+    height: 9px;
     border-radius: 50%;
-    background: rgba(255, 255, 255, 0.5);
-    transition: background 0.3s ease;
+    background: rgba(255, 255, 255, 0.45);
+    border: 1px solid rgba(255, 255, 255, 0.32);
+    transition: background 0.3s ease, transform 0.3s ease;
     cursor: pointer;
 }
 
 .single-cover__dot.is-active {
     background: #fff;
+    transform: scale(1.12);
 }
 
 /* ===== 面包屑 ===== */