diff --git a/README.md b/README.md
index 169056e..12899a2 100644
--- a/README.md
+++ b/README.md
@@ -176,6 +176,36 @@ epigraph: 题记             # 可选
 
 代码风格：Astro/TS/TSX 一律 2 空格缩进。组件命名 `PascalCase` 与 `kebab-case` 混用，跟着所在目录的既有风格走即可。项目没有配 formatter，改动尽量贴合周围代码。
 
+### 移动端字号
+
+移动端（<768px）的字号比桌面端小一档，用 Tailwind 的移动优先写法表达 —— 基础值是手机用的，`md:` 前缀是桌面恢复值：
+
+```html
+<!-- 正文：手机 15.5px / 1.78，≥768px 回到 16.5px / 1.85 -->
+prose-p:text-[15.5px] md:prose-p:text-[16.5px]
+prose-p:leading-[1.78] md:prose-p:leading-[1.85]
+```
+
+改动集中在 `ArticleContent.astro`（正文、标题、引用、列表）和 `article-list.tsx`（列表区标题）。**不要动 `html` 的根字号**，那会连带缩放所有 rem 间距，容易连锁出问题。
+
+### 磨砂玻璃
+
+`global.css` 里有四个 token：
+
+| token | 默认 | 用途 |
+|---|---|---|
+| `--glass-bg` | `color-mix(in oklch, var(--card) 72%, transparent)` | 面板底色，由 `--card` 派生，亮/暗自动跟随 |
+| `--glass-border` | `color-mix(in oklch, var(--border) 75%, transparent)` | 面板描边 |
+| `--glass-blur` | `14px` | 模糊半径 |
+| `--glass-saturate` | `1.5` | 饱和度补偿，纯模糊会发灰 |
+
+用法：`background-color: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));`
+
+**只给「浮在内容上方、面积不大」的元素用**（移动端菜单面板、页眉、搜索面板）。不要给文章卡片大面积用，一屏十几个元素同时 `backdrop-filter` 会明显掉帧。另外记得带上 `-webkit-` 前缀，并在 `@supports not (backdrop-filter: blur(1px))` 里回退成不透明的 `var(--card)`。
+
+> 移动端页眉目前**故意关掉**了常驻磨砂（`site-header.astro` 的 `@media (max-width: 767px)` 那段）：固定元素持续模糊会让移动端合成开销变大。要开的话建议用「滚动后才开」的方式，别让它一直生效。
+
+
 ## 书架数据
 
 书架页的数据来自这三个文件，由 `src/components/bookshelf-content.astro` 在**构建时 import**（所以文件必须存在，删掉会导致构建失败）：
diff --git a/src/components/ArticleContent.astro b/src/components/ArticleContent.astro
index df24da7..f227508 100644
--- a/src/components/ArticleContent.astro
+++ b/src/components/ArticleContent.astro
@@ -35,7 +35,7 @@ const primaryTagHref = primaryTag ? `/?tag=${encodeURIComponent(primaryTag)}#hom
 
     <header class="mb-8 xl:mb-12">
       <h1
-        class="font-serif text-3xl sm:text-4xl md:text-5xl font-bold text-foreground leading-tight mb-6 flex items-start gap-3"
+        class="font-serif text-[27px] sm:text-4xl md:text-5xl font-bold text-foreground leading-tight mb-6 flex items-start gap-3"
         data-pagefind-meta="title"
       >
         <span class="w-1.5 h-8 sm:h-10 shrink-0 bg-primary rounded-full mt-[0.15em] sm:mt-[0.3em]"></span>
@@ -119,17 +119,17 @@ const primaryTagHref = primaryTag ? `/?tag=${encodeURIComponent(primaryTag)}#hom
       <article
         class="prose prose-neutral dark:prose-invert max-w-[44rem] mx-auto
         prose-headings:font-serif prose-headings:font-bold
-        prose-h2:text-3xl prose-h2:mt-12 prose-h2:mb-4 prose-h2:flex prose-h2:items-center prose-h2:gap-3
-        prose-h3:text-2xl prose-h3:mt-8 prose-h3:mb-3
-        prose-h4:text-xl
-        prose-p:text-[16.5px] prose-p:leading-[1.85] prose-p:my-5 prose-p:text-foreground/90
+        prose-h2:text-[25px] md:prose-h2:text-3xl prose-h2:mt-12 prose-h2:mb-4 prose-h2:flex prose-h2:items-center prose-h2:gap-3
+        prose-h3:text-[21px] md:prose-h3:text-2xl prose-h3:mt-8 prose-h3:mb-3
+        prose-h4:text-[18px] md:prose-h4:text-xl
+        prose-p:text-[15.5px] md:prose-p:text-[16.5px] prose-p:leading-[1.78] md:prose-p:leading-[1.85] prose-p:my-5 prose-p:text-foreground/90
         prose-a:text-primary prose-a:no-underline prose-a:hover:underline
-        prose-blockquote:border-l-primary prose-blockquote:border-l-2 prose-blockquote:pl-4 prose-blockquote:italic prose-blockquote:text-[16.5px] prose-blockquote:leading-[1.85] prose-blockquote:text-content-secondary prose-blockquote:font-normal
+        prose-blockquote:border-l-primary prose-blockquote:border-l-2 prose-blockquote:pl-4 prose-blockquote:italic prose-blockquote:text-[15.5px] md:prose-blockquote:text-[16.5px] prose-blockquote:leading-[1.78] md:prose-blockquote:leading-[1.85] prose-blockquote:text-content-secondary prose-blockquote:font-normal
         prose-strong:text-foreground prose-strong:font-semibold
         prose-code:text-primary prose-code:bg-secondary prose-code:px-1.5 prose-code:py-0.5 prose-code:rounded prose-code:text-sm prose-code:before:content-none prose-code:after:content-none
         prose-pre:bg-secondary prose-pre:border prose-pre:border-border
-        prose-ol:text-[16.5px] prose-ul:text-[16.5px] prose-ol:text-foreground/90 prose-ul:text-foreground/90 prose-ol:my-5 prose-ul:my-5
-        prose-li:marker:text-primary prose-li:my-1.5 prose-li:leading-[1.85]
+        prose-ol:text-[15.5px] md:prose-ol:text-[16.5px] prose-ul:text-[15.5px] md:prose-ul:text-[16.5px] prose-ol:text-foreground/90 prose-ul:text-foreground/90 prose-ol:my-5 prose-ul:my-5
+        prose-li:marker:text-primary prose-li:my-1.5 prose-li:leading-[1.78] md:prose-li:leading-[1.85]
         prose-table:text-sm
         prose-th:bg-secondary prose-th:px-4 prose-th:py-2 prose-th:text-left prose-th:font-medium
         prose-td:px-4 prose-td:py-2 prose-td:border-t prose-td:border-border
diff --git a/src/components/article-list.tsx b/src/components/article-list.tsx
index d90800b..7970598 100644
--- a/src/components/article-list.tsx
+++ b/src/components/article-list.tsx
@@ -312,11 +312,11 @@ export function ArticleList({
             style={{ animation: "fade-in-up 220ms ease-out" }}
           >
             {activeCategory === "all" && !activeTag ? (
-              <h2 className="font-serif text-2xl font-bold leading-tight tracking-tight text-foreground sm:text-3xl lg:text-[2.625rem]">
+              <h2 className="font-serif text-[21px] font-bold leading-tight tracking-tight text-foreground sm:text-3xl lg:text-[2.625rem]">
                 {headerMeta.heading}
               </h2>
             ) : (
-              <h2 className="flex flex-wrap items-end gap-x-2 gap-y-1 font-serif text-2xl font-bold leading-tight tracking-tight sm:text-3xl lg:text-[2.625rem]">
+              <h2 className="flex flex-wrap items-end gap-x-2 gap-y-1 font-serif text-[21px] font-bold leading-tight tracking-tight sm:text-3xl lg:text-[2.625rem]">
                 <span className="text-foreground/68">{headerMeta.eyebrow}</span>
                 <span className="text-foreground/35">/</span>
                 <span className="text-primary">{headerMeta.heading}</span>
diff --git a/src/components/site-header.astro b/src/components/site-header.astro
index 39be483..d9342e5 100644
--- a/src/components/site-header.astro
+++ b/src/components/site-header.astro
@@ -15,6 +15,12 @@ const navItems: { name: string; href: string; external?: boolean }[] = [
   { name: "关于", href: "/about/" },
   { name: "开往", href: "https://www.travellings.cn/go.html", external: true },
 ]
+
+// 静态站：当前页在构建时就知道，直接拿来高亮菜单项。
+// 切页后页眉会随新页面一起被换掉，所以这个标记始终对应当前页。
+const currentPath = Astro.url.pathname
+const isCurrent = (href: string) =>
+  href === "/#home-main" ? currentPath === "/" : currentPath.startsWith(href)
 ---
 
 <header class="site-header fixed top-0 left-0 right-0 z-50 bg-background/80 backdrop-blur-xl border-b border-border/50 py-4">
@@ -74,63 +80,119 @@ const navItems: { name: string; href: string; external?: boolean }[] = [
 
 <div
   id="mobile-menu"
-  class="mobile-menu md:hidden fixed inset-0 z-[60] opacity-0 pointer-events-none transition-opacity duration-300 ease-out"
+  class="mobile-menu md:hidden fixed inset-0 z-[60] pointer-events-none"
   aria-hidden="true"
 >
-  <div
-    class="mobile-menu-bg absolute inset-0 bg-background/95 backdrop-blur-xl"
-    data-dismiss
-    aria-hidden="true"
-  ></div>
+  <div class="mobile-menu-bg absolute inset-0" data-dismiss aria-hidden="true"></div>
 
-  <div class="relative h-full flex flex-col">
-    <div class="flex items-center justify-end px-6 py-4">
+  <div
+    class="mobile-menu-panel absolute left-3 right-3 top-[76px] p-2 rounded-2xl border max-h-[calc(100dvh-96px)] overflow-y-auto overscroll-contain"
+    role="dialog"
+    aria-modal="true"
+    aria-label="站点导航"
+  >
+    <div class="flex items-center justify-between pl-4 pr-1 pb-1.5">
+      <span class="text-[11px] font-medium uppercase tracking-[0.18em] text-muted-foreground">导航</span>
       <button
         type="button"
-        class="p-2 -mr-2 text-foreground"
+        class="p-2 rounded-lg text-muted-foreground transition-colors duration-200 hover:bg-secondary hover:text-foreground"
         aria-label="关闭菜单"
         data-dismiss
       >
-        <span class="relative block w-5 h-5">
-          <span class="absolute left-0 top-1/2 w-full h-px -translate-y-1/2 rotate-45 bg-current" />
-          <span class="absolute left-0 top-1/2 w-full h-px -translate-y-1/2 -rotate-45 bg-current" />
-        </span>
+        <svg
+          class="w-4 h-4"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          stroke-width="1.75"
+          stroke-linecap="round"
+          aria-hidden="true"
+        >
+          <path d="M6 6l12 12M18 6L6 18" />
+        </svg>
       </button>
     </div>
 
-    <nav class="flex-1 flex flex-col items-center justify-center gap-7 px-8">
+    <nav class="flex flex-col">
       {navItems.map((item, i) => (
         <a
           href={item.href}
           target={item.external ? "_blank" : undefined}
           rel={item.external ? "noreferrer" : undefined}
           data-astro-prefetch={item.external ? undefined : ""}
-          class="mobile-nav-item group text-3xl font-medium tracking-tight text-foreground"
-          style={`--stagger: ${60 + i * 40}ms`}
+          aria-current={isCurrent(item.href) ? "page" : undefined}
+          class:list={[
+            "mobile-nav-item group relative flex items-center gap-3 h-11 pl-4 pr-3 rounded-xl text-[18px] font-medium tracking-tight transition-colors duration-200",
+            isCurrent(item.href) ? "is-current text-primary" : "text-foreground hover:text-primary",
+          ]}
+          style={`--stagger: ${40 + i * 30}ms`}
         >
-          <span class="relative inline-block">
-            {item.name}
-            <span class="absolute left-0 -bottom-1 h-px w-full origin-right scale-x-0 bg-primary transition-transform duration-300 group-hover:origin-left group-hover:scale-x-100" />
-          </span>
+          <span class="mobile-nav-marker" aria-hidden="true" />
+          <span class="flex-1">{item.name}</span>
+          {item.external && (
+            <svg
+              class="w-3.5 h-3.5 text-muted-foreground/70 transition-transform duration-200 group-hover:-translate-y-0.5 group-hover:translate-x-0.5"
+              viewBox="0 0 24 24"
+              fill="none"
+              stroke="currentColor"
+              stroke-width="1.75"
+              stroke-linecap="round"
+              stroke-linejoin="round"
+              aria-hidden="true"
+            >
+              <path d="M7 17L17 7M9 7h8v8" />
+            </svg>
+          )}
         </a>
       ))}
     </nav>
-
   </div>
 </div>
 
 <style>
+  /* 容器只负责铺满屏幕、拦截点击和定位，透明度交给遮罩层和面板各自过渡 */
   .mobile-menu[data-open="true"] {
-    opacity: 1;
     pointer-events: auto;
   }
 
+  /* 遮罩：轻轻压暗 + 极轻的模糊，让人一眼看出下面的内容被“压住了”，点它关闭 */
+  .mobile-menu-bg {
+    opacity: 0;
+    background-color: color-mix(in oklch, var(--background) 45%, transparent);
+    transition: opacity 200ms ease-out;
+  }
+  .mobile-menu[data-open="true"] .mobile-menu-bg {
+    opacity: 1;
+  }
+
+  /* 悬浮面板：磨砂卡片，从顶部轻轻落下 */
+  .mobile-menu-panel {
+    opacity: 0;
+    transform: translateY(-10px) scale(0.985);
+    transform-origin: top center;
+    background-color: var(--glass-bg);
+    border-color: var(--glass-border);
+    box-shadow: 0 18px 48px -14px oklch(0 0 0 / 0.24);
+    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
+    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
+    transition:
+      opacity 180ms ease-out,
+      transform 260ms cubic-bezier(0.22, 1, 0.36, 1);
+  }
+  .mobile-menu[data-open="true"] .mobile-menu-panel {
+    opacity: 1;
+    transform: none;
+  }
+
+  /* 逐项入场 */
   .mobile-menu .mobile-nav-item {
     opacity: 0;
-    transform: translateY(14px);
+    transform: translateY(8px);
     transition:
-      opacity 420ms cubic-bezier(0.22, 1, 0.36, 1),
-      transform 420ms cubic-bezier(0.22, 1, 0.36, 1);
+      opacity 300ms cubic-bezier(0.22, 1, 0.36, 1),
+      transform 300ms cubic-bezier(0.22, 1, 0.36, 1),
+      background-color 200ms ease-out,
+      color 200ms ease-out;
     transition-delay: 0ms;
   }
   .mobile-menu[data-open="true"] .mobile-nav-item {
@@ -139,28 +201,83 @@ const navItems: { name: string; href: string; external?: boolean }[] = [
     transition-delay: var(--stagger, 0ms);
   }
 
-  @media (prefers-reduced-motion: reduce) {
-    .mobile-menu,
-    .mobile-menu .mobile-nav-item {
-      transition-duration: 1ms !important;
-      transform: none !important;
+  .mobile-nav-item:hover {
+    background-color: color-mix(in oklch, var(--secondary) 70%, transparent);
+  }
+  .mobile-nav-item.is-current {
+    background-color: color-mix(in oklch, var(--primary) 8%, transparent);
+  }
+  /* 键盘 Tab 进来时的焦点环，比浏览器默认那圈细一点、柔一点 */
+  .mobile-nav-item:focus-visible,
+  .mobile-menu-panel button:focus-visible {
+    outline: 2px solid color-mix(in oklch, var(--primary) 45%, transparent);
+    outline-offset: -2px;
+  }
+
+  /* 朱墨留白的那道红色短竖线，复用正文标题的语言 */
+  .mobile-nav-marker {
+    position: absolute;
+    left: 0;
+    top: 50%;
+    width: 3px;
+    height: 1rem;
+    border-radius: 9999px;
+    background-color: var(--primary);
+    opacity: 0;
+    transform: translateY(-50%) scaleY(0);
+    transition:
+      opacity 200ms ease-out,
+      transform 200ms cubic-bezier(0.22, 1, 0.36, 1);
+  }
+  .mobile-nav-item:hover .mobile-nav-marker,
+  .mobile-nav-item.is-current .mobile-nav-marker {
+    opacity: 1;
+    transform: translateY(-50%) scaleY(1);
+  }
+
+  /* 不支持 backdrop-filter 的浏览器：退回不透明卡片，别让文字糊在内容上 */
+  @supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
+    .mobile-menu-panel {
+      background-color: var(--card);
     }
   }
 
-  /* Drop the heavy backdrop-filter on small viewports. The fixed header keeps
-     blurring everything underneath while scrolling, which makes mobile compositing
-     expensive. Use a slightly more opaque background instead. */
+  /* 系统开启“减少透明度”时直接关掉磨砂 */
+  @media (prefers-reduced-transparency: reduce) {
+    .mobile-menu-panel {
+      background-color: var(--card);
+      backdrop-filter: none;
+      -webkit-backdrop-filter: none;
+    }
+  }
+
+  @media (prefers-reduced-motion: reduce) {
+    .mobile-menu,
+    .mobile-menu-panel,
+    .mobile-menu-bg,
+    .mobile-menu .mobile-nav-item,
+    .mobile-nav-marker {
+      transition-duration: 1ms !important;
+    }
+    .mobile-menu-panel,
+    .mobile-menu .mobile-nav-item {
+      transform: none !important;
+    }
+    .mobile-nav-marker,
+    .mobile-nav-item.is-current .mobile-nav-marker,
+    .mobile-nav-item:hover .mobile-nav-marker {
+      transform: translateY(-50%) scaleY(1) !important;
+    }
+  }
+
+  /* 小屏上页眉不再常驻 backdrop-filter：固定元素持续模糊会让移动端合成开销变大，
+     顶部时用实色反而更省更快。菜单面板是点开才出现的、面积也小，保留磨砂。 */
   @media (max-width: 767px) {
     .site-header {
       backdrop-filter: none !important;
       -webkit-backdrop-filter: none !important;
       background-color: var(--background) !important;
     }
-    .mobile-menu-bg {
-      backdrop-filter: none !important;
-      -webkit-backdrop-filter: none !important;
-      background-color: var(--background) !important;
-    }
   }
 </style>
 
diff --git a/src/styles/global.css b/src/styles/global.css
index b61d67b..5d357c0 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -48,6 +48,16 @@
   --chart-4: oklch(0.828 0.189 84.429);
   --chart-5: oklch(0.769 0.188 70.08);
   --radius: 0.5rem;
+  /*
+   * 磨砂玻璃 token —— 只给「浮在内容上方、面积不大」的元素用
+   * （移动端菜单、页眉、搜索面板…）。不要给文章卡片大面积用，
+   * 一屏十几个元素同时 backdrop-filter 会明显掉帧。
+   * 由 --card 派生，所以亮/暗色自动跟随。
+   */
+  --glass-bg: color-mix(in oklch, var(--card) 72%, transparent);
+  --glass-border: color-mix(in oklch, var(--border) 75%, transparent);
+  --glass-blur: 14px;
+  --glass-saturate: 1.5;
   --sidebar: oklch(0.985 0 0);
   --sidebar-foreground: oklch(0.145 0 0);
   --sidebar-primary: oklch(0.55 0.22 var(--primary-hue, 25));