diff --git a/frontend/index.html b/frontend/index.html
index 87e1aeb..2a23a64 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -7,7 +7,13 @@
     <meta name="theme-color" content="#1f1d1a" media="(prefers-color-scheme: dark)" />
     <title>ONE · 一个博客</title>
     <meta name="description" content="长文与短文，同一种节奏。" />
+    <!-- 方案 A「一横」：SVG 优先（内部有 prefers-color-scheme，深浅皮肤各自变色），
+         PNG 只给不认 SVG 的老浏览器；apple-touch-icon 必须 PNG（iOS 不支持 SVG，
+         且会把透明压成黑底，所以那张铺了纸色实底）。 -->
     <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+    <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32.png" />
+    <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16.png" />
+    <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
     <link rel="alternate" type="application/rss+xml" title="RSS" href="/rss.xml" />
     <!--
       UI 版本在 <html> 上以 data-ui 表达，服务端设置要等 /api/site 才知道。
diff --git a/frontend/public/apple-touch-icon.png b/frontend/public/apple-touch-icon.png
new file mode 100644
index 0000000..4aa8041
Binary files /dev/null and b/frontend/public/apple-touch-icon.png differ
diff --git a/frontend/public/favicon-16.png b/frontend/public/favicon-16.png
new file mode 100644
index 0000000..f1a4b33
Binary files /dev/null and b/frontend/public/favicon-16.png differ
diff --git a/frontend/public/favicon-32.png b/frontend/public/favicon-32.png
new file mode 100644
index 0000000..880f0c4
Binary files /dev/null and b/frontend/public/favicon-32.png differ
diff --git a/frontend/public/favicon.svg b/frontend/public/favicon.svg
index 151a214..b8110e2 100644
--- a/frontend/public/favicon.svg
+++ b/frontend/public/favicon.svg
@@ -1,32 +1,10 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<svg id="Layer_2" data-name="Layer 2" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 128.81 128.17">
-  <defs>
-    <style>
-      .cls-1 {
-        fill: url(#gradient3);
-      }
-
-      .cls-2 {
-        fill: #000;
-      }
-
-      @media (prefers-color-scheme: dark) {
-        .cls-2 {
-          fill: #fff;
-        }
-      }
-    </style>
-    <linearGradient id="gradient3" x1="57.54" y1="31.44" x2="128.81" y2="31.44" gradientUnits="userSpaceOnUse">
-      <stop offset="0" stop-color="#ff4d4d"/>
-      <stop offset=".99" stop-color="#f9cb28"/>
-    </linearGradient>
-  </defs>
-  <g id="b">
-    <g>
-      <path class="cls-2" d="M56.32,100.47c0,15.98-11.84,27.61-27.85,27.61S.33,116.45,.33,100.47s11.83-27.45,28.08-27.45,27.91,11.63,27.91,27.45Z"/>
-      <path class="cls-2" d="M120,101.26v19.31c-4.87,4.63-12.9,7.6-21.65,7.6-18.33,0-30-10.49-30-26.7s12.92-28.34,31.07-28.34v28.13h20.58Z"/>
-      <polygon class="cls-1" points="119.7 21.48 128.81 38.51 83.27 62.88 57.54 14.79 85.17 0 101.79 31.06 119.7 21.48"/>
-      <polygon class="cls-2" points="0 63.11 16.54 32.82 .68 8.17 55.98 8.17 40.12 32.82 56.65 63.11 0 63.11"/>
-    </g>
-  </g>
-</svg>
\ No newline at end of file
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" role="img" aria-label="ONE">
+  <!-- 方案 A「一横」：墨圆 + 一道白横，既是字母 O 也是汉字「一」。
+       横杠用 fill-rule="evenodd" 挖成真洞（不是叠一块纸色矩形），
+       所以它在任何底色上都是透明的——不需要为深浅皮肤各出一版。 -->
+  <style>
+    .m { fill: #33302b }
+    @media (prefers-color-scheme: dark) { .m { fill: #e8e3d9 } }
+  </style>
+  <path class="m" fill-rule="evenodd" d="M32 4a28 28 0 1 0 0 56 28 28 0 1 0 0-56Zm-16 23.5h32a1 1 0 0 1 1 1v7a1 1 0 0 1-1 1H16a1 1 0 0 1-1-1v-7a1 1 0 0 1 1-1Z"/>
+</svg>
diff --git a/frontend/src/components/LeftNav.vue b/frontend/src/components/LeftNav.vue
index 37a8975..7f7bdc8 100644
--- a/frontend/src/components/LeftNav.vue
+++ b/frontend/src/components/LeftNav.vue
@@ -3,6 +3,7 @@ import { computed } from 'vue'
 import { site } from '../site'
 import { socialIcon } from '../socialIcons'
 import ThemeSwitcher from './ThemeSwitcher.vue'
+import LogoMark from './LogoMark.vue'
 
 // vivid 用顶部导航（VividNav）代替左栏。这里直接不渲染。
 const isVivid = computed(() => site.ui_id === 'vivid')
@@ -15,7 +16,7 @@ const social = computed(() => (site.social_links || []).filter((s) => s && s.url
   <aside v-if="!isVivid" class="rail-left">
     <div class="inner">
       <RouterLink to="/" class="brand">
-        <span class="mark">○</span>
+        <span class="mark"><LogoMark /></span>
         <span class="name">{{ site.site_title || 'ONE' }}</span>
       </RouterLink>
       <p class="desc">{{ site.site_desc }}</p>
@@ -86,9 +87,13 @@ const social = computed(() => (site.social_links || []).filter((s) => s && s.url
   gap: 8px;
 }
 
+/* 原来这里是一个排版字符 ○ 充当标记，换成真站标。
+   flex:none：它是 .brand（flex）的子项，不锁住会被长站名压成椭圆 */
 .mark {
-  color: var(--accent);
-  font-size: 18px;
+  width: 22px;
+  height: 22px;
+  flex: none;
+  color: var(--ink);
 }
 
 .name {
diff --git a/frontend/src/components/LogoMark.vue b/frontend/src/components/LogoMark.vue
new file mode 100644
index 0000000..a34600c
--- /dev/null
+++ b/frontend/src/components/LogoMark.vue
@@ -0,0 +1,26 @@
+<script setup>
+// 站标「一横」：墨圆 + 一道白横 —— 字母 O 与汉字「一」同形，对应站名 ONE / 一个博客。
+//
+// 横杠是 fill-rule="evenodd" 挖出来的真洞，不是叠一块纸色矩形，所以任何底色
+// （纸感 / 墨色暗端 / 后台卡片）都直接透过去，不必为皮肤各出一版。
+// 颜色跟随 currentColor，尺寸由外层容器决定。
+</script>
+
+<template>
+  <svg class="logo-mark" viewBox="0 0 64 64" aria-hidden="true" focusable="false">
+    <path
+      fill="currentColor"
+      fill-rule="evenodd"
+      d="M32 4a28 28 0 1 0 0 56 28 28 0 1 0 0-56Zm-16 23.5h32a1 1 0 0 1 1 1v7a1 1 0 0 1-1 1H16a1 1 0 0 1-1-1v-7a1 1 0 0 1 1-1Z"
+    />
+  </svg>
+</template>
+
+<style scoped>
+.logo-mark {
+  display: block;
+  width: 100%;
+  height: 100%;
+  flex-shrink: 0;
+}
+</style>
diff --git a/frontend/src/components/PostCard.vue b/frontend/src/components/PostCard.vue
index 09a2dbd..5efdbd2 100644
--- a/frontend/src/components/PostCard.vue
+++ b/frontend/src/components/PostCard.vue
@@ -5,6 +5,7 @@ import { site } from '../site'
 import { openLightbox } from '../lightbox'
 import { relativeDate, stripTags, minutesLabel, sanitizeHtml, thumbURL, thumbifyHtml } from '../utils'
 import LinkCard from './LinkCard.vue'
+import LogoMark from './LogoMark.vue'
 
 const router = useRouter()
 
@@ -34,15 +35,13 @@ const summaryText = computed(() => {
   return text.length > 110 ? text.slice(0, 110) + '…' : text
 })
 
-const initial = computed(() => (site.author_name || 'O').trim().slice(0, 1).toUpperCase())
-
 // 配图缩略图宽度：单图全宽格取宽一些，多图小格 480 足够（2x 屏也清晰）
 const gridW = computed(() => (props.post.images && props.post.images.length === 1 ? 720 : 480))
 </script>
 
 <template>
   <article class="row-feed" :class="{ short: isShort }" @click="openPost">
-    <div class="avatar" aria-hidden="true">{{ initial }}</div>
+    <div class="avatar"><LogoMark /></div>
 
     <div class="body">
       <div class="byline">
@@ -126,18 +125,12 @@ const gridW = computed(() => (props.post.images && props.post.images.length ===
   background: var(--paper-sunken);
 }
 
+/* 站标本身就是个圆，所以原来那层 accent-soft 圆底 / 衬线首字母都不需要了，
+   只留尺寸与颜色。想换回降饱和蓝只需改 color 一行。 */
 .avatar {
   width: 40px;
   height: 40px;
-  border-radius: 50%;
-  background: var(--accent-soft);
-  color: var(--accent);
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  font-family: var(--serif);
-  font-size: 17px;
-  user-select: none;
+  color: var(--ink);
 }
 
 .byline {
diff --git a/frontend/src/components/QuickShort.vue b/frontend/src/components/QuickShort.vue
index 9054964..73fa3fc 100644
--- a/frontend/src/components/QuickShort.vue
+++ b/frontend/src/components/QuickShort.vue
@@ -1,6 +1,7 @@
 <script setup>
 import { computed, onMounted, ref } from 'vue'
 import { adminApi } from '../api'
+import LogoMark from './LogoMark.vue'
 
 // Twitter 式短文发布盒，挂在时间线顶部。
 //
@@ -17,7 +18,6 @@ import { adminApi } from '../api'
 const emit = defineEmits(['published'])
 
 const shown = ref(false)
-const userName = ref('')
 const draft = ref('')
 const publishing = ref(false)
 const error = ref('')
@@ -53,7 +53,6 @@ function removeImage(i) {
   images.value.splice(i, 1)
 }
 
-const initial = computed(() => (userName.value || 'O').trim().slice(0, 1).toUpperCase())
 const canPost = computed(
   () => (draft.value.trim().length > 0 || images.value.length > 0) && !publishing.value
 )
@@ -62,7 +61,6 @@ onMounted(async () => {
   try {
     const d = await adminApi.me()
     if (d.user) {
-      userName.value = String(d.user)
       shown.value = true
     }
   } catch {
@@ -110,7 +108,7 @@ async function publish() {
     <!-- 桌面：内联 -->
     <div class="qs-inline">
       <div class="qs-card">
-        <span class="qs-av">{{ initial }}</span>
+        <span class="qs-av"><LogoMark /></span>
         <div class="qs-body">
           <textarea v-model="draft" class="qs-input" rows="2" placeholder="记点短的…" @keydown="onKey" />
           <div v-if="images.length" class="qs-thumbs">
@@ -197,17 +195,12 @@ async function publish() {
   background: var(--card);
 }
 
+/* 站标自身是圆，去掉原来的 accent-soft 圆底与首字母字号；flex:none 防被压扁 */
 .qs-av {
   flex: none;
   width: 34px;
   height: 34px;
-  border-radius: 50%;
-  background: var(--accent-soft);
-  color: var(--accent);
-  display: grid;
-  place-items: center;
-  font-weight: 700;
-  font-size: 14px;
+  color: var(--ink);
 }
 
 .qs-body {
diff --git a/frontend/src/components/TopBar.vue b/frontend/src/components/TopBar.vue
index 8c64378..d2ce4cf 100644
--- a/frontend/src/components/TopBar.vue
+++ b/frontend/src/components/TopBar.vue
@@ -3,6 +3,7 @@ import { nextTick, onBeforeUnmount, onMounted, ref, watch } from 'vue'
 import { RouterLink, useRoute } from 'vue-router'
 import { site } from '../site'
 import NavBurger from './NavBurger.vue'
+import LogoMark from './LogoMark.vue'
 
 // 手机端导航。原来把 5 个链接平铺在顶栏里：375px 挤成一排小字，
 // 触点只有十几像素高，320px 的屏还会折行。改成 brand + 汉堡钮，
@@ -105,7 +106,10 @@ onBeforeUnmount(() => {
 <template>
   <!-- 窄屏时左栏收起，导航回到顶部；下滑隐藏、上滑唤回 -->
   <header class="topbar" :class="{ hidden }">
-    <RouterLink to="/" class="brand">{{ site.site_title || 'ONE' }}</RouterLink>
+    <RouterLink to="/" class="brand">
+      <span class="mk"><LogoMark /></span>
+      <span>{{ site.site_title || 'ONE' }}</span>
+    </RouterLink>
     <NavBurger
       ref="burger"
       class="burger"
@@ -179,6 +183,16 @@ onBeforeUnmount(() => {
     font-family: var(--serif);
     font-size: 17px;
     color: var(--ink);
+    display: flex;
+    align-items: center;
+    gap: 8px;
+  }
+
+  .brand .mk {
+    width: 20px;
+    height: 20px;
+    flex: none;
+    color: var(--ink);
   }
 
   .burger {
diff --git a/frontend/src/ui/yohaku/YohakuTop.vue b/frontend/src/ui/yohaku/YohakuTop.vue
index 84da61a..8bda666 100644
--- a/frontend/src/ui/yohaku/YohakuTop.vue
+++ b/frontend/src/ui/yohaku/YohakuTop.vue
@@ -3,6 +3,7 @@ import { nextTick, onBeforeUnmount, onMounted, ref, watch } from 'vue'
 import { RouterLink, useRoute } from 'vue-router'
 import { site } from '../../site'
 import NavBurger from '../../components/NavBurger.vue'
+import LogoMark from '../../components/LogoMark.vue'
 
 // 余白顶栏。对应设计稿的 <header class="top">：品牌 / 导航 / 操作三块，
 // 滚动过 8px 加 .scrolled（设计稿的「四态里的第一态」）。
@@ -27,7 +28,6 @@ const links = [
   { to: '/about', label: '关于', en: 'About' }
 ]
 
-const initial = () => (site.author_name || site.site_title || 'O').trim().slice(0, 1).toUpperCase()
 const title = () => site.site_title?.split(/[·|]/)[0]?.trim() || 'ONE'
 
 function isOn(l) {
@@ -94,7 +94,7 @@ function toggleTheme() {
   <header class="top" :class="{ scrolled }">
     <div class="top-in">
       <RouterLink class="brand" to="/">
-        <span class="av">{{ initial() }}</span>
+        <span class="av"><LogoMark /></span>
         <span>{{ title() }}</span>
       </RouterLink>
       <nav class="nav" aria-label="站点导航">
@@ -115,7 +115,7 @@ function toggleTheme() {
        必须待在 .top 外面：.top 有 backdrop-filter，会给 fixed 后代当包含块。 -->
   <div class="dock">
     <RouterLink class="dock-brand" to="/">
-      <span class="av">{{ initial() }}</span>
+      <span class="av"><LogoMark /></span>
       <span>{{ title() }}</span>
     </RouterLink>
     <NavBurger
diff --git a/frontend/src/ui/yohaku/chrome.css b/frontend/src/ui/yohaku/chrome.css
index 06331a7..fa6bc57 100644
--- a/frontend/src/ui/yohaku/chrome.css
+++ b/frontend/src/ui/yohaku/chrome.css
@@ -15,15 +15,8 @@ html[data-ui='vivid'] .brand {display:flex;align-items:center;gap:10px;
 @media (hover: hover) and (pointer: fine) {
   html[data-ui='vivid'] .brand:hover {transform:scale(1.04)}
 }
-/* .av 品牌标记：顶栏一枚，菜单里那枚随菜单头一起撤了（顶栏浮在菜单上） */
-html[data-ui='vivid'] .brand .av {width:30px;height:30px;border-radius:50%;
-  background:linear-gradient(135deg,var(--accent),var(--accent-deep));
-  display:grid;place-items:center;color:#fff;font-size:13px;font-weight:800;
-  box-shadow:0 0 0 2px var(--paper),0 0 0 3.5px var(--accent-soft);
-  position:relative;}
-html[data-ui='vivid'] .brand .av::after {content:"";position:absolute;right:-1px;bottom:-1px;
-  width:9px;height:9px;border-radius:50%;
-  background:#34c759;border:2px solid var(--paper);}
+/* .av 品牌标记：原来这里是一条 .brand .av 规则，但它被下面 :is(.brand,.dock-brand)
+   那条同特指度、且位置更靠后的规则完整覆盖了——等于死规则。合并成一条，避免两处漂移。 */
 html[data-ui='vivid'] .nav {display:flex;gap:2px;flex:1;justify-content:center}
 html[data-ui='vivid'] .nav a {position:relative;font-size:13.5px;font-weight:600;color:var(--soft);
   padding:8px 14px;border-radius:999px;
@@ -74,9 +67,10 @@ html[data-ui='vivid'] .dock-brand {display:flex;align-items:center;gap:9px;
 @media (max-width:720px) {
   html[data-ui='vivid'] .dock {display:flex}
 }
-html[data-ui='vivid'] :is(.brand, .dock-brand) .av {width:30px;height:30px;border-radius:50%;
-  background:linear-gradient(135deg,var(--accent),var(--accent-deep));
-  display:grid;place-items:center;color:#fff;font-size:13px;font-weight:800;
+/* 品牌标记换成站标「一横」：它自身就是圆，所以去掉渐变圆盘与首字母字号；
+   右下角那颗绿色在线点保留（它是「有人在写」的信号，不属于被替换的部分）。 */
+html[data-ui='vivid'] :is(.brand, .dock-brand) .av {width:30px;height:30px;flex:none;
+  color:var(--ink);
   box-shadow:0 0 0 2px var(--paper),0 0 0 3.5px var(--accent-soft);
   position:relative;}
 html[data-ui='vivid'] :is(.brand, .dock-brand) .av::after {content:"";position:absolute;right:-1px;bottom:-1px;
diff --git a/frontend/src/views/PostView.vue b/frontend/src/views/PostView.vue
index eb4b7be..a19a2ce 100644
--- a/frontend/src/views/PostView.vue
+++ b/frontend/src/views/PostView.vue
@@ -6,6 +6,7 @@ import RightRail from '../components/RightRail.vue'
 import YohakuArticle from '../ui/yohaku/YohakuArticle.vue'
 import CommentSection from '../components/comments/CommentSection.vue'
 import LinkCard from '../components/LinkCard.vue'
+import LogoMark from '../components/LogoMark.vue'
 import { openLightbox } from '../lightbox'
 import { publicApi } from '../api'
 import { site, applyDocTitle } from '../site'
@@ -68,7 +69,6 @@ onBeforeUnmount(() => window.removeEventListener('scroll', onScroll))
 watch(() => route.params.slug, load)
 
 const isShort = computed(() => post.value && post.value.kind === 'short')
-const initial = computed(() => (site.author_name || 'O').trim().slice(0, 1).toUpperCase())
 </script>
 
 <template>
@@ -100,7 +100,7 @@ const initial = computed(() => (site.author_name || 'O').trim().slice(0, 1).toUp
         <article v-else class="wrap" :class="{ short: isShort }">
           <header class="head">
             <div class="byline">
-              <div class="avatar">{{ initial }}</div>
+              <div class="avatar"><LogoMark /></div>
               <div class="who">
                 <span class="author">{{ site.author_name || 'ONE' }}</span>
                 <span class="sub">
@@ -188,17 +188,11 @@ const initial = computed(() => (site.author_name || 'O').trim().slice(0, 1).toUp
   gap: 12px;
 }
 
+/* 站标自身是圆，原来的 accent-soft 圆底与衬线首字母一并去掉，只留尺寸与颜色 */
 .avatar {
   width: 44px;
   height: 44px;
-  border-radius: 50%;
-  background: var(--accent-soft);
-  color: var(--accent);
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  font-family: var(--serif);
-  font-size: 18px;
+  color: var(--ink);
 }
 
 .who {
