diff --git a/apps/api/src/routes/ranking.ts b/apps/api/src/routes/ranking.ts
index 5ff324d..09bef46 100644
--- a/apps/api/src/routes/ranking.ts
+++ b/apps/api/src/routes/ranking.ts
@@ -46,6 +46,8 @@ const WINDOW_BEFORE = 5
 const WINDOW_AFTER = 7
 /** 没有「我」（老师、没上榜）时榜面给多少 */
 const BOARD_HEAD_NO_ME = 30
+/** 全服名单最多列到第几名，展开也到此为止（一千五百多人全摊开页面会卡死） */
+const ALL_CAP = 100
 /** 走势图往回看几周 */
 const TREND_WEEKS = 4
 /** 每周冠军列几周 */
@@ -58,6 +60,7 @@ function toRow(standing: Standing, change: number | null): RankRow {
     user: sampleUser(entrant, null),
     avatar: entrant.avatar,
     className: entrant.className,
+    mood: entrant.mood,
     solved: standing.solved,
     reachedAt: standing.reachedAt,
     change,
@@ -187,11 +190,13 @@ rankingRoutes.get("/rankings/board", optionalAuth, async (c) => {
   const meIndex = user ? now.findIndex((row) => row.entrant.id === user.id && row.solved > 0) : -1
   const me = meIndex >= 0 ? now[meIndex] : undefined
 
+  const cap = scope.data === "all" ? ALL_CAP : null
+  const listable = cap ? now.slice(0, cap) : now
   const full = includeZero || c.req.query("full") === "1"
-  let picked = now
+  let picked = listable
   if (!full) {
     const head = me ? BOARD_HEAD : BOARD_HEAD_NO_ME
-    picked = now.filter(
+    picked = listable.filter(
       (_, index) =>
         index < head || (me && index >= meIndex - WINDOW_BEFORE && index <= meIndex + WINDOW_AFTER),
     )
@@ -230,7 +235,8 @@ rankingRoutes.get("/rankings/board", optionalAuth, async (c) => {
     changeSince,
     total: now.length,
     rows: picked.map((row) => rowOf(row)!),
-    complete: picked.length === now.length,
+    complete: picked.length === listable.length,
+    cap,
     me: rowOf(me),
     ahead: rowOf(meIndex > 0 ? now[meIndex - 1] : undefined),
     behind: rowOf(meIndex >= 0 ? now[meIndex + 1] : undefined),
@@ -340,3 +346,31 @@ rankingRoutes.put("/rankings/hidden/:userId", requireTeacher, async (c) => {
   if (!updated.length) return failure(c, 404, "user-not-found", "没有这个学生")
   return success(c, null)
 })
+
+/**
+ * 老师清空一个学生的个性签名。签名在排名上挂出来以后更显眼，拿同学开涮、留电话号码的
+ * 得有人能拿掉（用户 2026-10-10 定的）。只清这一句，他之后还能重新写。
+ */
+rankingRoutes.delete("/rankings/mood/:userId", requireTeacher, async (c) => {
+  const userId = Number(c.req.param("userId"))
+  if (!Number.isInteger(userId)) return failure(c, 400, "invalid-user", "用户不对")
+
+  const updated = await db
+    .update(schema.userProfile)
+    .set({ mood: null })
+    .where(
+      and(
+        eq(schema.userProfile.userId, userId),
+        inArray(
+          schema.userProfile.userId,
+          db
+            .select({ id: schema.user.id })
+            .from(schema.user)
+            .where(inArray(schema.user.adminType, [...STUDENT_ROLES])),
+        ),
+      ),
+    )
+    .returning({ id: schema.userProfile.userId })
+  if (!updated.length) return failure(c, 404, "user-not-found", "没有这个学生")
+  return success(c, null)
+})
diff --git a/apps/api/src/services/ranking.ts b/apps/api/src/services/ranking.ts
index 270627f..1dfe9a7 100644
--- a/apps/api/src/services/ranking.ts
+++ b/apps/api/src/services/ranking.ts
@@ -51,6 +51,7 @@ export interface Entrant {
   username: string
   className: string | null
   avatar: string | null
+  mood: string | null
   /** 每道题第一次做对的时刻，升序；毫秒数用来比较，原文留着给出参 */
   times: number[]
   stamps: string[]
@@ -90,6 +91,7 @@ export async function loadEntrants(where: SQL, since: string | null): Promise<En
         username: schema.user.username,
         className: schema.user.className,
         avatar: schema.userProfile.avatar,
+        mood: schema.userProfile.mood,
       })
       .from(schema.user)
       .leftJoin(schema.userProfile, eq(schema.userProfile.userId, schema.user.id))
@@ -125,6 +127,7 @@ export async function loadEntrants(where: SQL, since: string | null): Promise<En
       username: person.username,
       className: person.className,
       avatar: avatarOf(person.avatar),
+      mood: person.mood?.trim() || null,
       times: pairs.map(([time]) => time),
       stamps: pairs.map(([, stamp]) => stamp),
     }
diff --git a/apps/web/src/oj/api.ts b/apps/web/src/oj/api.ts
index df610b5..41bdba2 100644
--- a/apps/web/src/oj/api.ts
+++ b/apps/web/src/oj/api.ts
@@ -264,6 +264,11 @@ export function setRankHidden(userId: number, hidden: boolean) {
   return api.put<null>(`rankings/hidden/${userId}`, { hidden })
 }
 
+/** 老师清空一个学生的个性签名 */
+export function clearMood(userId: number) {
+  return api.delete<null>(`rankings/mood/${userId}`)
+}
+
 /**
  * 本周进步榜。`scope` 只有两个取值，服务端认不出的一律当 global ——
  * 班级榜要求调用者有班级，教师/超管拿到的是 400，所以别在没班级时切过去。
@@ -363,7 +368,7 @@ export function uploadAvatar(file: File) {
   })
 }
 
-export function updateProfile(data: { realName: string; mood: string }) {
+export function updateProfile(data: { realName?: string; mood?: string }) {
   return api.put<Profile>("me/profile", data)
 }
 
diff --git a/apps/web/src/oj/rank/components/RankMe.vue b/apps/web/src/oj/rank/components/RankMe.vue
index df23ba0..2f26836 100644
--- a/apps/web/src/oj/rank/components/RankMe.vue
+++ b/apps/web/src/oj/rank/components/RankMe.vue
@@ -1,6 +1,8 @@
 <script setup lang="ts">
-import type { RankRow } from "@oj2/contract"
+import { MOOD_MAX, type RankRow } from "@oj2/contract"
 import { useThemeVars } from "naive-ui"
+import { updateProfile } from "oj/api"
+import { useUserStore } from "shared/store/user"
 import UserName from "shared/components/UserName.vue"
 import { gapText, toPass } from "../utils"
 import RankAvatar from "./RankAvatar.vue"
@@ -18,6 +20,9 @@ export interface MiniRank {
  *
  * 用词只说位置（前一名 / 后一名 / 进步最大），不用「追」「对手」「冲」：用户指出
  * 「要追的」「追你」会被中学生读成追求谁，「冲得最猛」也容易误会。
+ *
+ * 个性签名（设计稿「签名 A」）：自己的签名挂在大字下面，「改」就地改，不用跳去设置页；
+ * 没写的给一句「写一句个性签名」。前一名、后一名的签名挂在他们名字下面。
  */
 const props = defineProps<{
   me: RankRow
@@ -31,8 +36,39 @@ const props = defineProps<{
   /** 手机：前后一名的说明换到名字下面一行，别被截断 */
   compact?: boolean
 }>()
+const emit = defineEmits<{ moodSaved: [mood: string | null] }>()
 
 const theme = useThemeVars()
+const message = useMessage()
+const userStore = useUserStore()
+
+const editing = ref(false)
+const draft = ref("")
+const saving = ref(false)
+
+watch(editing, (open) => {
+  if (open) draft.value = props.me.mood ?? ""
+})
+
+async function saveMood() {
+  const mood = draft.value.trim()
+  if (mood.length > MOOD_MAX) {
+    message.warning(`个性签名最多 ${MOOD_MAX} 个字`)
+    return
+  }
+  saving.value = true
+  try {
+    await updateProfile({ mood })
+    if (userStore.profile) userStore.profile.mood = mood || null
+    emit("moodSaved", mood || null)
+    editing.value = false
+    message.success(mood ? "签名改好了" : "签名清空了")
+  } catch {
+    message.error("没保存上，再试一次")
+  } finally {
+    saving.value = false
+  }
+}
 
 const headline = computed(() => {
   const { me, ahead, third } = props
@@ -77,6 +113,70 @@ function threatNote(me: RankRow, behind: RankRow) {
         </div>
       </div>
     </div>
+    <n-popover
+      v-model:show="editing"
+      trigger="click"
+      placement="bottom-start"
+      :style="{ width: '300px' }"
+    >
+      <template #trigger>
+        <button v-if="me.mood" class="mood" aria-label="改个性签名">
+          <span class="quote-mark" aria-hidden="true">“</span>
+          <n-ellipsis class="mood-text" :line-clamp="2" :tooltip="false">{{ me.mood }}</n-ellipsis>
+          <span class="mood-edit">
+            <svg
+              width="12"
+              height="12"
+              viewBox="0 0 24 24"
+              fill="none"
+              stroke="currentColor"
+              stroke-width="2"
+              stroke-linecap="round"
+              stroke-linejoin="round"
+              aria-hidden="true"
+            >
+              <path d="M4 20h4L19 9l-4-4L4 16z" />
+            </svg>
+            改
+          </span>
+        </button>
+        <button v-else class="mood empty">
+          <svg
+            width="13"
+            height="13"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+            stroke-linecap="round"
+            stroke-linejoin="round"
+            aria-hidden="true"
+          >
+            <path d="M4 20h4L19 9l-4-4L4 16z" />
+          </svg>
+          写一句个性签名，上了领奖台全班都看得到
+        </button>
+      </template>
+      <form class="mood-form" @submit.prevent="saveMood">
+        <label class="mood-label" for="rank-mood-input">个性签名</label>
+        <n-input
+          v-model:value="draft"
+          :input-props="{ id: 'rank-mood-input' }"
+          :maxlength="MOOD_MAX"
+          show-count
+          clearable
+          placeholder="写点什么，让大家认识你"
+          autofocus
+        />
+        <span class="mood-hint">排名、个人主页上都会显示</span>
+        <div class="mood-actions">
+          <n-button size="small" @click="editing = false">取消</n-button>
+          <n-button size="small" type="primary" attr-type="submit" :loading="saving">
+            保存
+          </n-button>
+        </div>
+      </form>
+    </n-popover>
     <div v-if="headline" class="headline">
       <svg
         width="18"
@@ -97,14 +197,24 @@ function threatNote(me: RankRow, behind: RankRow) {
     <div v-if="ahead" class="rival">
       <span class="tag chase">前一名</span>
       <RankAvatar :username="ahead.user.username" :avatar="ahead.avatar" :size="20" />
-      <UserName :username="ahead.user.username" class="rival-name" />
-      <span class="note">{{ chaseNote(me, ahead) }}</span>
+      <div class="rival-body">
+        <div class="rival-line">
+          <UserName :username="ahead.user.username" class="rival-name" />
+          <span class="note">{{ chaseNote(me, ahead) }}</span>
+        </div>
+        <span v-if="ahead.mood" class="rival-mood" :title="ahead.mood">“{{ ahead.mood }}”</span>
+      </div>
     </div>
     <div v-if="behind" class="rival">
       <span class="tag threat">后一名</span>
       <RankAvatar :username="behind.user.username" :avatar="behind.avatar" :size="20" />
-      <UserName :username="behind.user.username" class="rival-name" />
-      <span class="note">{{ threatNote(me, behind) }}</span>
+      <div class="rival-body">
+        <div class="rival-line">
+          <UserName :username="behind.user.username" class="rival-name" />
+          <span class="note">{{ threatNote(me, behind) }}</span>
+        </div>
+        <span v-if="behind.mood" class="rival-mood" :title="behind.mood">“{{ behind.mood }}”</span>
+      </div>
     </div>
     <div v-if="minis.length" class="minis">
       <button v-for="mini in minis" :key="mini.label" class="mini" @click="mini.go">
@@ -206,24 +316,121 @@ function threatNote(me: RankRow, behind: RankRow) {
 
 .rival {
   display: flex;
-  align-items: center;
+  align-items: flex-start;
   gap: 8px;
   font-size: 13px;
   min-width: 0;
 }
 
-.compact .rival {
-  display: grid;
-  grid-template-columns: auto auto 1fr;
+.rival > .tag {
+  margin-top: 2px;
+}
+
+.rival-body {
+  flex: 1;
+  min-width: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 1px;
+}
+
+.rival-line {
+  display: flex;
   align-items: center;
-  row-gap: 1px;
+  gap: 8px;
+  min-width: 0;
+}
+
+.compact .rival-line {
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 1px;
 }
 
 .compact .note {
-  grid-column: 3;
   white-space: normal;
 }
 
+.rival-mood {
+  font-size: 12px;
+  color: v-bind("theme.textColor3");
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.mood {
+  display: flex;
+  align-items: flex-start;
+  gap: 6px;
+  width: 100%;
+  padding: 8px 10px;
+  border: 1px solid rgba(24, 160, 88, 0.3);
+  border-radius: 6px;
+  background: v-bind("theme.cardColor");
+  color: v-bind("theme.textColor1");
+  font: inherit;
+  font-size: 13px;
+  line-height: 1.45;
+  text-align: left;
+  cursor: pointer;
+}
+
+.mood.empty {
+  align-items: center;
+  border-style: dashed;
+  color: #18a058;
+}
+
+.mood:hover {
+  border-color: #18a058;
+}
+
+.quote-mark {
+  color: rgba(24, 160, 88, 0.55);
+  font-family: Georgia, serif;
+  font-size: 22px;
+  line-height: 18px;
+}
+
+.mood-text {
+  flex: 1;
+  min-width: 0;
+  word-break: break-all;
+}
+
+.mood-edit {
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
+  padding-top: 1px;
+  font-size: 12px;
+  color: #18a058;
+  white-space: nowrap;
+}
+
+.mood-form {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.mood-label {
+  font-size: 13px;
+  font-weight: 600;
+}
+
+.mood-hint {
+  font-size: 12px;
+  color: v-bind("theme.textColor3");
+}
+
+.mood-actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: 8px;
+}
+
 .rival-name {
   flex-shrink: 0;
   max-width: 120px;
diff --git a/apps/web/src/oj/rank/components/RankPodium.vue b/apps/web/src/oj/rank/components/RankPodium.vue
index 07521ad..f758a35 100644
--- a/apps/web/src/oj/rank/components/RankPodium.vue
+++ b/apps/web/src/oj/rank/components/RankPodium.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import type { RankRow } from "@oj2/contract"
 import { useThemeVars } from "naive-ui"
+import { useBreakpoints } from "shared/composables/breakpoints"
 import UserName from "shared/components/UserName.vue"
 import { useRankPalette } from "../palette"
 import RankAvatar from "./RankAvatar.vue"
@@ -8,17 +9,22 @@ import RankAvatar from "./RankAvatar.vue"
 /**
  * 领奖台：前三名站在台阶上，第一名戴皇冠。赛道从第 4 名接着排，前三不再出现第二遍。
  * 你的前一名站在台上时台阶描蓝边、挂「前一名」，和赛道里的蓝条是一回事。
+ *
+ * 个性签名挂在台上（设计稿「签名 A」）：桌面是头像旁边一个气泡，像在说一句话；手机台阶窄，
+ * 气泡放到头像上面。只露两行，长的指上去（手机点一下）看全文。老师能在气泡上清空它。
  */
 const props = defineProps<{
   rows: RankRow[]
   meId?: number
   chaseId?: number
   threatId?: number
+  teacher?: boolean
 }>()
-defineEmits<{ open: [username: string] }>()
+defineEmits<{ open: [username: string]; clearMood: [row: RankRow] }>()
 
 const theme = useThemeVars()
 const palette = useRankPalette()
+const { isDesktop } = useBreakpoints()
 
 /** 台阶从左到右是 2、1、3 */
 const steps = computed(() =>
@@ -27,41 +33,66 @@ const steps = computed(() =>
     .filter((step): step is { place: number; row: RankRow } => !!step.row),
 )
 
-const HEIGHTS: Record<number, number> = { 1: 50, 2: 38, 3: 30 }
+/** 台阶比原来矮一截：台上多了签名气泡，矮下来赛道才放得进机房第一屏（41 人的班也够） */
+const HEIGHTS: Record<number, number> = { 1: 40, 2: 30, 3: 26 }
 </script>
 
 <template>
-  <div class="podium">
+  <div class="podium" :class="{ phone: !isDesktop }">
     <div v-for="{ place, row } in steps" :key="place" class="step" :class="`p${place}`">
-      <div class="top">
-        <svg
-          v-if="place === 1"
-          class="crown"
-          width="18"
-          height="18"
-          viewBox="0 0 24 24"
-          fill="#f2c94c"
-          stroke="#9a6700"
-          stroke-width="1.6"
-          stroke-linejoin="round"
-          role="img"
-          aria-label="第一名"
-        >
-          <path d="M3 8l4.5 4L12 5l4.5 7L21 8l-2 11H5z" />
-        </svg>
-        <span v-if="row.user.id === chaseId" class="tag chase">前一名</span>
-        <span v-else-if="row.user.id === threatId" class="tag threat">后一名</span>
-        <span v-else-if="row.user.id === meId" class="tag me">你</span>
+      <div class="who">
+        <span class="face">
+          <svg
+            v-if="place === 1"
+            class="crown"
+            width="18"
+            height="18"
+            viewBox="0 0 24 24"
+            fill="#f2c94c"
+            stroke="#9a6700"
+            stroke-width="1.6"
+            stroke-linejoin="round"
+            role="img"
+            aria-label="第一名"
+          >
+            <path d="M3 8l4.5 4L12 5l4.5 7L21 8l-2 11H5z" />
+          </svg>
+          <RankAvatar
+            :username="row.user.username"
+            :avatar="row.avatar"
+            :size="place === 1 ? 34 : 28"
+            :me="row.user.id === meId"
+          />
+        </span>
+        <div class="words">
+          <div class="name-line">
+            <button class="name" @click="$emit('open', row.user.username)">
+              <UserName :username="row.user.username" />
+            </button>
+            <span v-if="row.user.id === chaseId" class="tag chase">前一名</span>
+            <span v-else-if="row.user.id === threatId" class="tag threat">后一名</span>
+            <span v-else-if="row.user.id === meId" class="tag me">你</span>
+          </div>
+          <div v-if="row.mood" class="bubble">
+            <n-ellipsis
+              :line-clamp="2"
+              :expand-trigger="isDesktop ? undefined : 'click'"
+              :tooltip="isDesktop ? { contentStyle: { maxWidth: '300px' } } : false"
+            >
+              {{ row.mood }}
+            </n-ellipsis>
+            <button
+              v-if="teacher"
+              class="clear"
+              aria-label="清空他的签名"
+              title="清空他的签名"
+              @click="$emit('clearMood', row)"
+            >
+              ×
+            </button>
+          </div>
+        </div>
       </div>
-      <RankAvatar
-        :username="row.user.username"
-        :avatar="row.avatar"
-        :size="place === 1 ? 34 : 28"
-        :me="row.user.id === meId"
-      />
-      <button class="name" @click="$emit('open', row.user.username)">
-        <UserName :username="row.user.username" />
-      </button>
       <div
         class="block"
         :style="{
@@ -98,19 +129,146 @@ const HEIGHTS: Record<number, number> = { 1: 50, 2: 38, 3: 30 }
 }
 
 .step {
-  width: 170px;
+  flex: 0 1 272px;
+  min-width: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+}
+
+/* 桌面：头像在左，右边名字一行、签名气泡一行，像一句聊天 */
+.who {
+  display: flex;
+  align-items: flex-end;
+  gap: 8px;
+  padding: 0 4px;
+  min-width: 0;
+}
+
+.face {
+  position: relative;
+  display: inline-flex;
+  flex-shrink: 0;
+}
+
+.crown {
+  position: absolute;
+  left: -7px;
+  top: -11px;
+  transform: rotate(-18deg);
+}
+
+.words {
+  flex: 1;
   min-width: 0;
   display: flex;
   flex-direction: column;
-  align-items: center;
   gap: 3px;
 }
 
-.top {
-  height: 18px;
+.name-line {
   display: flex;
   align-items: center;
-  gap: 4px;
+  gap: 5px;
+  min-width: 0;
+}
+
+.bubble {
+  position: relative;
+  padding: 3px 9px;
+  border: 1px solid v-bind("theme.dividerColor");
+  border-radius: 8px;
+  background: v-bind("theme.actionColor");
+  font-size: 12px;
+  line-height: 16px;
+  color: v-bind("theme.textColor2");
+  word-break: break-all;
+}
+
+.clear {
+  position: absolute;
+  right: -7px;
+  top: -7px;
+  width: 16px;
+  height: 16px;
+  padding: 0;
+  border: 1px solid v-bind("theme.borderColor");
+  border-radius: 8px;
+  background: v-bind("theme.cardColor");
+  color: v-bind("theme.textColor3");
+  font-size: 12px;
+  line-height: 13px;
+  cursor: pointer;
+  display: none;
+}
+
+.bubble:hover .clear,
+.clear:focus-visible {
+  display: block;
+}
+
+.clear:hover {
+  color: v-bind("theme.errorColor");
+  border-color: v-bind("theme.errorColor");
+}
+
+/* 手机：台阶窄，气泡挪到头像上面，下面依次头像、名字 */
+.phone .step {
+  flex: 1 1 0;
+  gap: 3px;
+}
+
+.phone .who {
+  flex-direction: column;
+  align-items: center;
+  gap: 3px;
+  padding: 0;
+}
+
+.phone .words {
+  display: contents;
+}
+
+.phone .name-line {
+  max-width: 100%;
+  flex-direction: column;
+  gap: 1px;
+}
+
+.phone .face {
+  order: -1;
+  margin-top: 14px;
+}
+
+.phone .crown {
+  left: 50%;
+  top: -17px;
+  margin-left: -9px;
+  transform: none;
+}
+
+.phone .bubble {
+  order: -2;
+  width: 100%;
+  box-sizing: border-box;
+  margin-bottom: 4px;
+  padding: 3px 6px;
+  font-size: 11.5px;
+  line-height: 15px;
+}
+
+.phone .bubble::after {
+  content: "";
+  position: absolute;
+  left: 50%;
+  bottom: -5px;
+  width: 8px;
+  height: 8px;
+  margin-left: -4px;
+  background: v-bind("theme.actionColor");
+  border-right: 1px solid v-bind("theme.dividerColor");
+  border-bottom: 1px solid v-bind("theme.dividerColor");
+  transform: rotate(45deg);
 }
 
 .tag {
@@ -157,7 +315,7 @@ const HEIGHTS: Record<number, number> = { 1: 50, 2: 38, 3: 30 }
   align-items: flex-start;
   justify-content: center;
   gap: 10px;
-  padding-top: 5px;
+  padding-top: 3px;
 }
 
 .place {
diff --git a/apps/web/src/oj/rank/components/RankTrack.vue b/apps/web/src/oj/rank/components/RankTrack.vue
index 3cc7995..c9e2823 100644
--- a/apps/web/src/oj/rank/components/RankTrack.vue
+++ b/apps/web/src/oj/rank/components/RankTrack.vue
@@ -14,11 +14,16 @@ import RankAvatar from "./RankAvatar.vue"
  * 手机（设计稿「手机版」）：窄屏上条只剩几十像素宽，看不出谁多谁少，所以条改成每一行的
  * 底色；默认只列前几行和你附近几行，「看全班 N 人」点开。换范围 / 时间段时父组件换 key
  * 重新挂载，折叠状态跟着复位。
+ *
+ * 个性签名（设计稿「签名 A」）：桌面一行只有一百来像素的条，放不下一句话，所以有签名的
+ * 名字后面挂一个引号，指上去看；手机每行本来就有空，签名直接写在名字后面。
  */
 const props = defineProps<{
   rows: RankRow[]
   total: number
   complete: boolean
+  /** 名单最多列到第几名（全服 100），折叠处的「第 x–y 名」到此为止 */
+  cap?: number | null
   /** 条的满格是几道（第 2 名的数，第 1 名常常一骑绝尘） */
   scale: number
   meId?: number
@@ -38,6 +43,7 @@ const emit = defineEmits<{
   submissions: [username: string]
   analysis: [username: string]
   hide: [row: RankRow]
+  clearMood: [row: RankRow]
 }>()
 
 const theme = useThemeVars()
@@ -73,7 +79,9 @@ const items = computed<Item[]>(() => {
     list.push({ kind: "row", row })
     last = row.rank
   }
-  const end = props.complete ? (props.rows.at(-1)?.rank ?? last) : props.total
+  const end = props.complete
+    ? (props.rows.at(-1)?.rank ?? last)
+    : Math.min(props.total, props.cap ?? props.total)
   if (last < end) list.push({ kind: "gap", from: last + 1, to: end })
   return list
 })
@@ -129,15 +137,19 @@ function width(row: RankRow) {
   return `${Math.max(1.5, Math.min(100, (row.solved / Math.max(1, props.scale)) * 100))}%`
 }
 
-const menu: DropdownOption[] = [
-  { label: "看他的提交", key: "submissions" },
-  { label: "看他的智能分析", key: "analysis" },
-  { label: "不计入排名…", key: "hide" },
-]
+function menuOf(row: RankRow): DropdownOption[] {
+  return [
+    { label: "看他的提交", key: "submissions" },
+    { label: "看他的智能分析", key: "analysis" },
+    ...(row.mood ? [{ label: "清空他的签名…", key: "mood" }] : []),
+    { label: "不计入排名…", key: "hide" },
+  ]
+}
 
 function onMenu(key: string, row: RankRow) {
   if (key === "submissions") emit("submissions", row.user.username)
   else if (key === "analysis") emit("analysis", row.user.username)
+  else if (key === "mood") emit("clearMood", row)
   else emit("hide", row)
 }
 </script>
@@ -168,6 +180,7 @@ function onMenu(key: string, row: RankRow) {
           <button class="who" @click="emit('open', item.row.user.username)">
             <UserName :username="item.row.user.username" />
           </button>
+          <span class="mood">{{ item.row.mood }}</span>
           <span v-if="item.row.user.id === chaseId" class="tag chase">前一名</span>
           <span v-else-if="item.row.user.id === threatId" class="tag threat">后一名</span>
           <span v-else-if="item.row.user.id === hotId" class="tag hot">进步最大</span>
@@ -182,7 +195,7 @@ function onMenu(key: string, row: RankRow) {
           <n-dropdown
             v-if="teacher"
             trigger="click"
-            :options="menu"
+            :options="menuOf(item.row)"
             @select="(key: string) => onMenu(key, item.row)"
           >
             <button class="more" aria-label="更多">⋯</button>
@@ -196,9 +209,28 @@ function onMenu(key: string, row: RankRow) {
             :size="16"
             :me="item.row.user.id === meId"
           />
-          <button class="who" @click="emit('open', item.row.user.username)">
-            <UserName :username="item.row.user.username" />
-          </button>
+          <n-tooltip :disabled="!item.row.mood" :style="{ maxWidth: '300px' }">
+            <template #trigger>
+              <button class="who" @click="emit('open', item.row.user.username)">
+                <UserName :username="item.row.user.username" />
+                <svg
+                  v-if="item.row.mood"
+                  class="quote"
+                  width="11"
+                  height="11"
+                  viewBox="0 0 24 24"
+                  fill="currentColor"
+                  role="img"
+                  aria-label="有个性签名"
+                >
+                  <path
+                    d="M4 18v-5c0-4 2-7 6-8l1 2c-2 1-3 2.5-3 4h3v7zm9 0v-5c0-4 2-7 6-8l1 2c-2 1-3 2.5-3 4h3v7z"
+                  />
+                </svg>
+              </button>
+            </template>
+            {{ item.row.mood }}
+          </n-tooltip>
           <span class="bar-box">
             <span class="bar" :style="{ width: width(item.row), background: barColor(item.row) }" />
           </span>
@@ -218,7 +250,7 @@ function onMenu(key: string, row: RankRow) {
           <n-dropdown
             v-if="teacher"
             trigger="click"
-            :options="menu"
+            :options="menuOf(item.row)"
             @select="(key: string) => onMenu(key, item.row)"
           >
             <button class="more" aria-label="更多">⋯</button>
@@ -295,7 +327,18 @@ function onMenu(key: string, row: RankRow) {
 
 .prow .who {
   width: auto;
+  max-width: 120px;
+}
+
+/* 手机：签名跟在名字后面，一行放不下就省略 */
+.mood {
   flex: 1;
+  min-width: 0;
+  font-size: 12px;
+  color: v-bind("theme.textColor3");
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
 .prow .rank {
@@ -351,9 +394,16 @@ function onMenu(key: string, row: RankRow) {
   text-align: left;
   cursor: pointer;
   display: flex;
+  align-items: center;
+  gap: 3px;
   min-width: 0;
 }
 
+.quote {
+  flex-shrink: 0;
+  color: v-bind("theme.textColor3");
+}
+
 .bar-box {
   flex-grow: 1;
   height: 11px;
diff --git a/apps/web/src/oj/rank/list.vue b/apps/web/src/oj/rank/list.vue
index 996451e..0184519 100644
--- a/apps/web/src/oj/rank/list.vue
+++ b/apps/web/src/oj/rank/list.vue
@@ -8,7 +8,7 @@ import type {
   WeeklyChampion,
 } from "@oj2/contract"
 import { useThemeVars } from "naive-ui"
-import { getClassBattle, getRankBoard, getWeeklyChampions, setRankHidden } from "oj/api"
+import { clearMood, getClassBattle, getRankBoard, getWeeklyChampions, setRankHidden } from "oj/api"
 import { classLabel } from "oj/submission/utils"
 import UserName from "shared/components/UserName.vue"
 import { useBreakpoints } from "shared/composables/breakpoints"
@@ -199,11 +199,14 @@ const subtitle = computed(() => {
   const b = board.value
   if (!b) return ""
   const head = b.scope === "class" ? `${b.total} 人` : `${b.total} 人做对过`
-  const part = b.complete
-    ? ""
-    : b.me
+  const capped = !!b.cap && b.total > b.cap
+  const part = !b.complete
+    ? b.me
       ? " · 前面一段 + 你附近一段"
       : ` · 只列前面 ${b.rows.length} 名`
+    : capped
+      ? ` · 只列前 ${b.cap} 名`
+      : ""
   return `${head} · 一样多的，先做到的在前${part}`
 })
 /** 手机上标题旁边那句：只说从哪天起、跟什么时候比 */
@@ -342,6 +345,32 @@ function hide(row: RankRow) {
   })
 }
 
+/** 签名改了 / 清了：榜上这个人的每一处（赛道、领奖台、「你」卡、前后一名）就地换掉，不重取 */
+function setMood(userId: number, mood: string | null) {
+  const b = board.value
+  if (!b) return
+  for (const row of [...b.rows, b.me, b.ahead, b.behind])
+    if (row?.user.id === userId) row.mood = mood
+}
+
+function onMoodSaved(mood: string | null) {
+  if (meId.value) setMood(meId.value, mood)
+}
+
+function confirmClearMood(row: RankRow) {
+  dialog.warning({
+    title: "清空个性签名",
+    content: `${row.user.username} 的签名「${row.mood}」会被清空。只清这一句，他之后还能重新写。`,
+    positiveText: "清空",
+    negativeText: "取消",
+    onPositiveClick: async () => {
+      await clearMood(row.user.id)
+      setMood(row.user.id, null)
+      message.success("签名已清空")
+    },
+  })
+}
+
 async function restore(userId: number) {
   await setRankHidden(userId, false)
   message.success("已恢复")
@@ -414,7 +443,9 @@ async function restore(userId: number) {
             :me-id="meId"
             :chase-id="board.ahead?.user.id"
             :threat-id="board.behind?.user.id"
+            :teacher="teacher"
             @open="open"
+            @clear-mood="confirmClearMood"
           />
           <RankTrack
             :key="`${board.scope}|${board.period}|${board.className}`"
@@ -422,6 +453,7 @@ async function restore(userId: number) {
             :whole-label="board.scope === 'class' ? `看全班 ${board.total} 人` : undefined"
             :total="board.total"
             :complete="board.complete"
+            :cap="board.cap"
             :scale="scale"
             :me-id="meId"
             :chase-id="board.ahead?.user.id"
@@ -435,6 +467,7 @@ async function restore(userId: number) {
             @submissions="openSubmissions"
             @analysis="openAnalysis"
             @hide="hide"
+            @clear-mood="confirmClearMood"
           />
         </template>
         <div v-else-if="!loading" class="empty">排名没取到，刷新一下试试</div>
@@ -452,6 +485,7 @@ async function restore(userId: number) {
             :label="`${scopeLabel(board.scope)} · ${periodLabel(board.period)}`"
             :minis="minis"
             :compact="!isDesktop"
+            @mood-saved="onMoodSaved"
           />
           <div v-else-if="board.hidden" class="note-card">
             <b>你现在不计入排名</b>
diff --git a/apps/web/src/oj/user/setting.vue b/apps/web/src/oj/user/setting.vue
index 94ac54c..f0fcdeb 100644
--- a/apps/web/src/oj/user/setting.vue
+++ b/apps/web/src/oj/user/setting.vue
@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import { MOOD_MAX } from "@oj2/contract"
 import { updateProfile, uploadAvatar } from "oj/api"
 import { useUserStore } from "shared/store/user"
 
@@ -25,6 +26,12 @@ async function upload({ file }: UploadCustomRequestOptions) {
 }
 
 async function saveProfile() {
+  // 以前限 256 字，老的长签名还在库里：输入框挡不住已有的字，存之前先说清楚
+  const length = userStore.profile?.mood?.trim().length ?? 0
+  if (length > MOOD_MAX) {
+    message.warning(`个性签名最多 ${MOOD_MAX} 个字，现在有 ${length} 个，删短一点再保存`)
+    return
+  }
   try {
     await updateProfile({
       realName: userStore.profile?.realName ?? "",
@@ -55,7 +62,12 @@ async function saveProfile() {
         <n-input v-model:value="userStore.profile.realName" />
       </n-form-item> -->
       <n-form-item label="个性签名">
-        <n-input v-model:value="userStore.profile.mood" />
+        <n-input
+          v-model:value="userStore.profile.mood"
+          :maxlength="MOOD_MAX"
+          show-count
+          placeholder="会显示在排名和个人主页上"
+        />
       </n-form-item>
       <n-button @click="saveProfile">更改信息</n-button>
     </n-form>
diff --git a/packages/contract/src/account.ts b/packages/contract/src/account.ts
index bdace87..03243f9 100644
--- a/packages/contract/src/account.ts
+++ b/packages/contract/src/account.ts
@@ -3,6 +3,9 @@ import { z } from "zod"
 import { sampleUserSchema } from "./common"
 import { userProfileSchema } from "./auth"
 
+/** 个性签名最多几个字。以前是 256，排名上要露出来后改成 30（九成签名本来就不超过 26 字） */
+export const MOOD_MAX = 30
+
 export const registerRequestSchema = z.object({
   username: z.string().trim().min(1).max(32),
   email: z.email().max(64),
@@ -12,7 +15,8 @@ export const registerRequestSchema = z.object({
 export const updateProfileRequestSchema = z.object({
   realName: z.string().max(32).nullable().optional(),
   avatar: z.string().max(256).optional(),
-  mood: z.string().max(256).nullable().optional(),
+  /** 排名上要挂出来（`MOOD_MAX`），太长了榜上放不下 */
+  mood: z.string().trim().max(MOOD_MAX, `个性签名最多 ${MOOD_MAX} 个字`).nullable().optional(),
 })
 
 export const metricsSchema = z.object({
diff --git a/packages/contract/src/ranking.ts b/packages/contract/src/ranking.ts
index 9d904ff..03c24c6 100644
--- a/packages/contract/src/ranking.ts
+++ b/packages/contract/src/ranking.ts
@@ -19,6 +19,12 @@ export const rankRowSchema = z.object({
   /** 自己上传的头像；还是默认头像时为 null，前端画名字最后一个字 */
   avatar: z.string().nullable(),
   className: z.string().nullable(),
+  /**
+   * 个性签名，没写为 null。学生拿它展示个性、炫耀（用户 2026-10-10 定的要露出来）：
+   * 领奖台上、「你」卡、前后一名、赛道悬停都挂着。老规矩写到 256 字，现在限 30 字，
+   * 老的长签名前端只露两行、指上去看全文
+   */
+  mood: z.string().nullable(),
   solved: z.number().int().nonnegative(),
   /** 做到这个数的时刻（最后一道新做对的题）；一道没做对时为 null */
   reachedAt: z.string().nullable(),
@@ -58,7 +64,13 @@ export const rankBoardSchema = z.object({
    * 中间折起来，按名次断开的地方就是折叠处
    */
   rows: z.array(rankRowSchema),
+  /** `rows` 已经是能列的全部（本年级 = 全部；全服 = 前 `cap` 名） */
   complete: z.boolean(),
+  /**
+   * 名单最多列到第几名：全服 100（用户 2026-10-10 定的），本班 / 本年级 null。
+   * 全服一千五百多人，展开全量会把页面卡死；100 名以外不列，「你」卡上照样报名次
+   */
+  cap: z.number().int().positive().nullable(),
   /** 我在这张榜上的那一行。没登录、老师、不计入排名、或者这段时间一道没做对时为 null */
   me: rankRowSchema.nullable(),
   /** 名次紧挨在我前面、后面的人 */