diff --git a/apps/web/src/components/QuickEntryDrawer.vue b/apps/web/src/components/QuickEntryDrawer.vue
index d7fba4e..9a4250e 100644
--- a/apps/web/src/components/QuickEntryDrawer.vue
+++ b/apps/web/src/components/QuickEntryDrawer.vue
@@ -24,7 +24,7 @@ const props = defineProps<{
   ledgerId: string;
   ledgerName: string;
   personalLedgerId: string;
-  ledgerOptions: Array<{ id: string; name: string; color: string; isPersonal: boolean }>;
+  ledgerOptions: Array<{ id: string; name: string; gradient: string; isPersonal: boolean }>;
 }>();
 
 const emit = defineEmits<{
@@ -541,7 +541,7 @@ function saveEntry() {
       <header><div><strong>选择账本</strong><span>至少选择一个账本</span></div><button type="button" aria-label="关闭" @click="ledgerPickerOpen = false"><X :size="19" /></button></header>
       <div class="quick-ledger-options">
         <button v-for="ledger in ledgerOptions" :key="ledger.id" type="button" :class="{ selected: selectedLedgerIds.includes(ledger.id), automatic: ledger.isPersonal }" :disabled="ledger.isPersonal" @click="toggleLedger(ledger.id)">
-          <span :style="{ background: ledger.color }"><BookOpen :size="17" /></span>
+          <span :style="{ background: ledger.gradient }"><BookOpen :size="17" /></span>
           <strong>{{ ledger.name }}<small v-if="ledger.isPersonal">自动记入</small></strong>
           <Check v-if="selectedLedgerIds.includes(ledger.id)" :size="19" />
         </button>
diff --git a/apps/web/src/components/QuickEntryHost.vue b/apps/web/src/components/QuickEntryHost.vue
index 0afdd33..a473d23 100644
--- a/apps/web/src/components/QuickEntryHost.vue
+++ b/apps/web/src/components/QuickEntryHost.vue
@@ -3,6 +3,7 @@ import { BarChart3, BookOpen, Check, CircleUserRound, LibraryBig, Plus } from "@
 import { computed, onMounted, ref } from "vue";
 import { useRoute } from "vue-router";
 import { createEntry } from "../data/entries";
+import { ledgerTheme } from "../data/ledgers";
 import { useEntryStore } from "../stores/entries";
 import { useAuthStore } from "../stores/auth";
 import { useLedgerStore } from "../stores/ledgers";
@@ -16,7 +17,7 @@ const drawerOpen = ref(false);
 const savedToast = ref(false);
 
 const ledgerOptions = computed(() =>
-  ledgerStore.ledgers.map((ledger) => ({ id: ledger.id, name: ledger.name, color: ledger.color, isPersonal: ledger.isPersonal })),
+  ledgerStore.ledgers.map((ledger) => ({ id: ledger.id, name: ledger.name, gradient: ledgerTheme(ledger.theme).gradient, isPersonal: ledger.isPersonal })),
 );
 
 onMounted(async () => {
diff --git a/apps/web/src/data/ledgers.ts b/apps/web/src/data/ledgers.ts
index e2d88ea..c265162 100644
--- a/apps/web/src/data/ledgers.ts
+++ b/apps/web/src/data/ledgers.ts
@@ -1,9 +1,28 @@
-import type { CurrencyCode } from "@cents/domain";
+import { ledgerThemeAccents, type CurrencyCode, type LedgerThemeId } from "@cents/domain";
+
+export const ledgerThemes: ReadonlyArray<{
+  id: LedgerThemeId;
+  name: string;
+  accent: string;
+  gradient: string;
+}> = [
+  { id: "jade", name: "翡翠", accent: ledgerThemeAccents.jade, gradient: "linear-gradient(135deg, #118b79 0%, #087f72 48%, #285765 100%)" },
+  { id: "ocean", name: "海湾", accent: ledgerThemeAccents.ocean, gradient: "linear-gradient(135deg, #167b93 0%, #3459a4 52%, #4b3f7f 100%)" },
+  { id: "coral", name: "晚霞", accent: ledgerThemeAccents.coral, gradient: "linear-gradient(135deg, #c94f45 0%, #ad4869 54%, #6e4d82 100%)" },
+  { id: "berry", name: "莓果", accent: ledgerThemeAccents.berry, gradient: "linear-gradient(135deg, #a84378 0%, #71468d 52%, #40578a 100%)" },
+  { id: "meadow", name: "森野", accent: ledgerThemeAccents.meadow, gradient: "linear-gradient(135deg, #25805f 0%, #4e794b 54%, #766b35 100%)" },
+  { id: "graphite", name: "暮色", accent: ledgerThemeAccents.graphite, gradient: "linear-gradient(135deg, #35585d 0%, #4e556e 52%, #303f55 100%)" },
+];
+
+export function ledgerTheme(themeId?: string) {
+  return ledgerThemes.find((theme) => theme.id === themeId) ?? ledgerThemes[0];
+}
 
 export type LedgerRecord = {
   id: string;
   name: string;
   color: string;
+  theme: LedgerThemeId;
   defaultCurrency: CurrencyCode;
   createdAt: string;
   updatedAt: string;
@@ -31,6 +50,7 @@ export function createDefaultLedgers(): LedgerRecord[] {
       id: "local-ledger",
       name: "家庭日常",
       color: "#087f72",
+      theme: "jade",
       defaultCurrency: "CNY",
       createdAt: now,
       updatedAt: now,
@@ -41,6 +61,7 @@ export function createDefaultLedgers(): LedgerRecord[] {
       id: "travel-ledger",
       name: "旅行账本",
       color: "#3478e5",
+      theme: "ocean",
       defaultCurrency: "CNY",
       createdAt: now,
       updatedAt: now,
diff --git a/apps/web/src/stores/ledgers.ts b/apps/web/src/stores/ledgers.ts
index 350252c..37bcc84 100644
--- a/apps/web/src/stores/ledgers.ts
+++ b/apps/web/src/stores/ledgers.ts
@@ -112,13 +112,13 @@ export const useLedgerStore = defineStore("ledgers", {
     memberName(userId: string) {
       return this.currentMembers.find((member) => member.id === userId)?.name ?? "历史用户";
     },
-    async createLedger(input: Pick<LedgerRecord, "name" | "color" | "defaultCurrency">) {
+    async createLedger(input: Pick<LedgerRecord, "name" | "color" | "theme" | "defaultCurrency">) {
       const result = await apiRequest<{ ledger: LedgerRecord }>("/api/ledgers", { method: "POST", body: input });
       await this.reloadLedgers();
       await this.setCurrentLedger(result.ledger.id);
       return result.ledger;
     },
-    async updateLedger(input: Pick<LedgerRecord, "id" | "name" | "color" | "defaultCurrency">) {
+    async updateLedger(input: Pick<LedgerRecord, "id" | "name" | "color" | "theme" | "defaultCurrency">) {
       await apiRequest(`/api/ledgers/${encodeURIComponent(input.id)}`, { method: "PATCH", body: input });
       await this.reloadLedgers();
       return this.ledgers.find((ledger) => ledger.id === input.id)!;
diff --git a/apps/web/src/styles.css b/apps/web/src/styles.css
index b95b76d..17ac00f 100644
--- a/apps/web/src/styles.css
+++ b/apps/web/src/styles.css
@@ -75,7 +75,7 @@ input:focus-visible {
   z-index: 1;
   min-height: 180px;
   padding: max(18px, env(safe-area-inset-top)) 18px 20px;
-  background: #087f72;
+  background: var(--ledger-gradient, #087f72);
   color: #ffffff;
 }
 
@@ -112,7 +112,7 @@ input:focus-visible {
   display: grid;
   flex: 0 0 auto;
   place-items: center;
-  border: 2px solid #087f72;
+  border: 2px solid var(--ledger-accent, #087f72);
   border-radius: 50%;
   color: #ffffff;
   font-size: 10px;
diff --git a/apps/web/src/views/EntryDetailView.vue b/apps/web/src/views/EntryDetailView.vue
index e4557cd..ec83de6 100644
--- a/apps/web/src/views/EntryDetailView.vue
+++ b/apps/web/src/views/EntryDetailView.vue
@@ -22,6 +22,7 @@ import {
   findCategoryPath,
   type Category,
 } from "../data/categories";
+import { ledgerTheme } from "../data/ledgers";
 import { useEntryStore } from "../stores/entries";
 import { useLedgerStore } from "../stores/ledgers";
 
@@ -349,7 +350,7 @@ async function deleteEntry() {
         <header><div><strong>选择账本</strong><span>至少选择一个账本</span></div><button type="button" aria-label="关闭" @click="ledgerPickerOpen = false"><X :size="19" /></button></header>
         <div class="quick-ledger-options">
           <button v-for="ledger in ledgerStore.ledgers" :key="ledger.id" type="button" :class="{ selected: ledgerIds.includes(ledger.id), automatic: ledger.isPersonal }" :disabled="ledger.isPersonal" @click="toggleLedger(ledger.id)">
-            <span :style="{ background: ledger.color }"><BookOpen :size="17" /></span>
+            <span :style="{ background: ledgerTheme(ledger.theme).gradient }"><BookOpen :size="17" /></span>
             <strong>{{ ledger.name }}<small v-if="ledger.isPersonal">自动记入</small></strong>
             <Check v-if="ledgerIds.includes(ledger.id)" :size="19" />
           </button>
diff --git a/apps/web/src/views/LedgerSettingsView.vue b/apps/web/src/views/LedgerSettingsView.vue
index 7afb401..8f280e2 100644
--- a/apps/web/src/views/LedgerSettingsView.vue
+++ b/apps/web/src/views/LedgerSettingsView.vue
@@ -1,14 +1,15 @@
 <script setup lang="ts">
+import type { LedgerThemeId } from "@cents/domain";
 import { ArrowLeft, Check } from "@lucide/vue";
 import { onMounted, ref } from "vue";
 import { useRouter } from "vue-router";
+import { ledgerTheme, ledgerThemes } from "../data/ledgers";
 import { useLedgerStore } from "../stores/ledgers";
 
-const colors = ["#087f72", "#3478e5", "#7559d9", "#f05d3f", "#d84486", "#15956d"];
 const router = useRouter();
 const ledgerStore = useLedgerStore();
 const name = ref("");
-const color = ref(colors[0]);
+const themeId = ref<LedgerThemeId>("jade");
 const currency = ref<"CNY" | "USD" | "EUR" | "JPY" | "HKD">("CNY");
 const saving = ref(false);
 
@@ -20,14 +21,15 @@ onMounted(async () => {
   }
   if (!ledgerStore.currentLedger) return;
   name.value = ledgerStore.currentLedger.name;
-  color.value = ledgerStore.currentLedger.color;
+  themeId.value = ledgerStore.currentLedger.theme;
   currency.value = ledgerStore.currentLedger.defaultCurrency;
 });
 
 async function save() {
   if (!ledgerStore.currentLedger || !name.value.trim()) return;
   saving.value = true;
-  await ledgerStore.updateLedger({ id: ledgerStore.currentLedger.id, name: name.value, color: color.value, defaultCurrency: currency.value });
+  const theme = ledgerTheme(themeId.value);
+  await ledgerStore.updateLedger({ id: ledgerStore.currentLedger.id, name: name.value, color: theme.accent, theme: theme.id, defaultCurrency: currency.value });
   saving.value = false;
   await router.back();
 }
@@ -45,9 +47,9 @@ async function save() {
         <label><span>默认币种</span><select v-model="currency"><option value="CNY">人民币 CNY</option><option value="USD">美元 USD</option><option value="EUR">欧元 EUR</option><option value="JPY">日元 JPY</option><option value="HKD">港币 HKD</option></select></label>
       </section>
       <section class="color-setting">
-        <span>账本颜色</span>
+        <span>账本主题</span>
         <div>
-          <button v-for="item in colors" :key="item" type="button" :class="{ active: color === item }" :style="{ background: item }" :aria-label="`选择颜色 ${item}`" @click="color = item"><Check v-if="color === item" :size="17" /></button>
+          <button v-for="theme in ledgerThemes" :key="theme.id" type="button" :class="{ active: themeId === theme.id }" :style="{ background: theme.gradient }" :aria-label="`选择${theme.name}主题`" :title="theme.name" @click="themeId = theme.id"><Check v-if="themeId === theme.id" :size="17" /></button>
         </div>
       </section>
       <button class="save-ledger-settings" type="submit" :disabled="saving || !name.trim()"><Check :size="19" />{{ saving ? "保存中" : "保存设置" }}</button>
@@ -67,8 +69,8 @@ async function save() {
 .settings-form label span,.color-setting > span { color:#7b8884; font-size:11px; }
 .settings-form input,.settings-form select { width:100%; border:0; padding:0; outline:0; background:transparent; color:#26342f; font-size:15px; }
 .color-setting { margin-top:12px; padding-top:14px!important; padding-bottom:16px!important; }
-.color-setting > div { display:flex; gap:12px; margin-top:12px; }
-.color-setting button { width:38px; height:38px; display:grid; place-items:center; border:3px solid #fff; border-radius:50%; color:#fff; box-shadow:0 0 0 1px #d8e4e1; }
+.color-setting > div { display:grid; grid-template-columns:repeat(6, 38px); justify-content:space-between; gap:4px; margin-top:12px; }
+.color-setting button { width:38px; height:34px; display:grid; place-items:center; border:3px solid #fff; border-radius:8px; color:#fff; box-shadow:0 0 0 1px #d8e4e1; }
 .color-setting button.active { box-shadow:0 0 0 2px #263b36; }
 .save-ledger-settings { position:absolute; right:16px; bottom:16px; left:16px; height:48px; display:flex; align-items:center; justify-content:center; gap:7px; border:0; border-radius:8px; background:#087f72; color:#fff; font-weight:720; }
 .save-ledger-settings:disabled { opacity:.55; }
diff --git a/apps/web/src/views/LedgerView.vue b/apps/web/src/views/LedgerView.vue
index 7e65e21..0fc35ac 100644
--- a/apps/web/src/views/LedgerView.vue
+++ b/apps/web/src/views/LedgerView.vue
@@ -19,6 +19,7 @@ import { useRouter } from "vue-router";
 import QuickEntryHost from "../components/QuickEntryHost.vue";
 import { apiRequest, ApiError } from "../data/api";
 import { findCategory, findCategoryPath } from "../data/categories";
+import { ledgerTheme } from "../data/ledgers";
 import { useEntryStore } from "../stores/entries";
 import { useLedgerStore } from "../stores/ledgers";
 
@@ -72,6 +73,7 @@ const expenseText = computed(() => formatMoney(totals.value.expense));
 const visibleMonthlyEntries = computed(() => monthlyEntries.value.slice(0, visibleCount.value));
 const hasMoreEntries = computed(() => visibleCount.value < monthlyEntries.value.length);
 const pendingEntryCount = computed(() => store.pendingEntryCount(ledgerStore.currentLedgerId));
+const currentTheme = computed(() => ledgerTheme(ledgerStore.currentLedger?.theme));
 
 const dailyTotals = computed(() => {
   const summaries = new Map<string, { income: number; expense: number }>();
@@ -252,7 +254,7 @@ async function shareLedger() {
 
 <template>
   <main class="app-shell">
-    <header class="ledger-header">
+    <header class="ledger-header" :style="{ '--ledger-gradient': currentTheme.gradient, '--ledger-accent': currentTheme.accent }">
       <div class="top-actions">
         <button v-if="!ledgerStore.currentLedger?.isPersonal" class="participant-avatars" type="button" aria-label="查看账本参与者" title="账本参与者" @click="openParticipantSheet">
           <span v-for="member in ledgerStore.currentMembers.slice(0, 3)" :key="member.id" class="participant-avatar" :class="member.role">
diff --git a/apps/web/src/views/LedgersView.vue b/apps/web/src/views/LedgersView.vue
index 1c6d379..cb8f7db 100644
--- a/apps/web/src/views/LedgersView.vue
+++ b/apps/web/src/views/LedgersView.vue
@@ -1,20 +1,20 @@
 <script setup lang="ts">
-import type { CurrencyCode } from "@cents/domain";
+import type { CurrencyCode, LedgerThemeId } from "@cents/domain";
 import { Check, ChevronRight, LibraryBig, Plus, X } from "@lucide/vue";
 import { computed, onMounted, ref } from "vue";
 import { useRouter } from "vue-router";
 import QuickEntryHost from "../components/QuickEntryHost.vue";
 import { ApiError } from "../data/api";
+import { ledgerTheme, ledgerThemes } from "../data/ledgers";
 import { useEntryStore } from "../stores/entries";
 import { useLedgerStore } from "../stores/ledgers";
 
-const colors = ["#087f72", "#3478e5", "#7559d9", "#f05d3f", "#d84486", "#15956d"];
 const router = useRouter();
 const entryStore = useEntryStore();
 const ledgerStore = useLedgerStore();
 const createOpen = ref(false);
 const name = ref("");
-const color = ref(colors[0]);
+const themeId = ref<LedgerThemeId>("jade");
 const currency = ref<CurrencyCode>("CNY");
 const saving = ref(false);
 const errorMessage = ref("");
@@ -38,7 +38,7 @@ async function selectLedger(ledgerId: string) {
 
 function openCreate() {
   name.value = "";
-  color.value = colors[ledgerStore.ledgers.length % colors.length];
+  themeId.value = ledgerThemes[ledgerStore.ledgers.length % ledgerThemes.length].id;
   currency.value = ledgerStore.currentLedger?.defaultCurrency ?? "CNY";
   errorMessage.value = "";
   createOpen.value = true;
@@ -54,7 +54,8 @@ async function createLedger() {
   saving.value = true;
   errorMessage.value = "";
   try {
-    await ledgerStore.createLedger({ name: trimmedName, color: color.value, defaultCurrency: currency.value });
+    const theme = ledgerTheme(themeId.value);
+    await ledgerStore.createLedger({ name: trimmedName, color: theme.accent, theme: theme.id, defaultCurrency: currency.value });
     createOpen.value = false;
     await router.push("/");
   } catch (error) {
@@ -76,7 +77,7 @@ async function createLedger() {
       <p class="ledgers-caption">当前账本决定流水、统计和快速记账的默认归属。</p>
       <section class="ledger-list" aria-label="全部账本">
         <button v-for="ledger in ledgerStore.ledgers" :key="ledger.id" type="button" @click="selectLedger(ledger.id)">
-          <span class="ledger-list-icon" :style="{ color: ledger.color, background: `${ledger.color}18` }"><LibraryBig :size="22" /></span>
+          <span class="ledger-list-icon" :style="{ background: ledgerTheme(ledger.theme).gradient }"><LibraryBig :size="22" /></span>
           <span><strong>{{ ledger.name }}</strong><small>{{ entryCounts.get(ledger.id) ?? 0 }} 笔流水 · {{ ledger.isPersonal ? "仅自己可见" : ledger.defaultCurrency }}</small></span>
           <Check v-if="ledgerStore.currentLedgerId === ledger.id" class="current-ledger-check" :size="20" />
           <ChevronRight v-else :size="19" />
@@ -97,8 +98,8 @@ async function createLedger() {
           <label class="create-ledger-name"><span>账本名称</span><input v-model="name" maxlength="40" placeholder="例如：旅行计划" autocomplete="off" autofocus required /></label>
           <label class="create-ledger-currency"><span>默认币种</span><select v-model="currency"><option value="CNY">人民币 CNY</option><option value="USD">美元 USD</option><option value="EUR">欧元 EUR</option><option value="JPY">日元 JPY</option><option value="HKD">港币 HKD</option></select></label>
           <fieldset class="create-ledger-colors">
-            <legend>账本颜色</legend>
-            <div><button v-for="item in colors" :key="item" type="button" :class="{ active: color === item }" :style="{ background: item }" :aria-label="`选择颜色 ${item}`" @click="color = item"><Check v-if="color === item" :size="17" /></button></div>
+            <legend>账本主题</legend>
+            <div><button v-for="theme in ledgerThemes" :key="theme.id" type="button" :class="{ active: themeId === theme.id }" :style="{ background: theme.gradient }" :aria-label="`选择${theme.name}主题`" :title="theme.name" @click="themeId = theme.id"><Check v-if="themeId === theme.id" :size="17" /></button></div>
           </fieldset>
           <p v-if="errorMessage" class="create-ledger-error" role="alert">{{ errorMessage }}</p>
           <button class="create-ledger-submit" type="submit" :disabled="saving || !name.trim()"><Plus :size="19" />{{ saving ? "创建中" : "创建账本" }}</button>
@@ -119,7 +120,7 @@ async function createLedger() {
 .ledger-list { border-top:1px solid #dce7e4; border-bottom:1px solid #dce7e4; background:#fff; }
 .ledger-list button { width:100%; min-height:72px; display:grid; grid-template-columns:44px minmax(0,1fr) 22px; align-items:center; gap:11px; border:0; border-bottom:1px solid #e6eeec; padding:8px 12px; background:#fff; color:#26342f; text-align:left; }
 .ledger-list button:last-child { border-bottom:0; }
-.ledger-list-icon { width:42px; height:42px; display:grid; place-items:center; border-radius:9px; }
+.ledger-list-icon { width:42px; height:42px; display:grid; place-items:center; border-radius:9px; color:#fff; box-shadow:0 4px 10px rgba(38,59,54,.16); }
 .ledger-list button > span:nth-child(2) { min-width:0; display:grid; gap:2px; }
 .ledger-list strong { overflow:hidden; font-size:15px; text-overflow:ellipsis; white-space:nowrap; }
 .ledger-list small { color:#7b8884; font-size:11px; }
@@ -137,8 +138,8 @@ async function createLedger() {
 .create-ledger-sheet input,.create-ledger-sheet select { width:100%; min-width:0; border:0; padding:0; outline:0; background:#fff; color:#26342f; font-size:15px; }
 .create-ledger-colors { margin:0; border:0; border-top:1px solid #e2ebe8; padding:12px 2px 15px; }
 .create-ledger-colors legend { padding:0; }
-.create-ledger-colors > div { display:flex; gap:12px; margin-top:10px; }
-.create-ledger-colors button { width:38px; height:38px; display:grid; place-items:center; border:3px solid #fff; border-radius:50%; color:#fff; box-shadow:0 0 0 1px #d8e4e1; }
+.create-ledger-colors > div { display:grid; grid-template-columns:repeat(6, 38px); justify-content:space-between; gap:4px; margin-top:10px; }
+.create-ledger-colors button { width:38px; height:34px; display:grid; place-items:center; border:3px solid #fff; border-radius:8px; color:#fff; box-shadow:0 0 0 1px #d8e4e1; }
 .create-ledger-colors button.active { box-shadow:0 0 0 2px #263b36; }
 .create-ledger-error { margin:0 0 10px; color:#b83232; font-size:12px; }
 .create-ledger-submit { width:100%; height:48px; display:flex; align-items:center; justify-content:center; gap:7px; border:0; border-radius:8px; background:#087f72; color:#fff; font-weight:720; }
diff --git a/packages/domain/src/index.ts b/packages/domain/src/index.ts
index 1cc2cd6..dc4cdb2 100644
--- a/packages/domain/src/index.ts
+++ b/packages/domain/src/index.ts
@@ -4,6 +4,17 @@ export type CurrencyCode = "CNY" | "USD" | "EUR" | "JPY" | "HKD";
 
 export type ExchangeRateSource = "manual" | "system";
 
+export const ledgerThemeAccents = {
+  jade: "#087f72",
+  ocean: "#3478e5",
+  coral: "#c94f45",
+  berry: "#a84378",
+  meadow: "#2f8060",
+  graphite: "#526a78",
+} as const;
+
+export type LedgerThemeId = keyof typeof ledgerThemeAccents;
+
 export type LedgerEntry = {
   id: string;
   ownerId: string;
diff --git a/services/api/src/db.ts b/services/api/src/db.ts
index 2048449..864f14b 100644
--- a/services/api/src/db.ts
+++ b/services/api/src/db.ts
@@ -27,12 +27,22 @@ CREATE TABLE IF NOT EXISTS ledgers (
   id text PRIMARY KEY,
   name varchar(40) NOT NULL,
   color varchar(16) NOT NULL DEFAULT '#087f72',
+  theme varchar(24) NOT NULL DEFAULT 'jade',
   default_currency varchar(3) NOT NULL DEFAULT 'CNY',
   created_at timestamptz NOT NULL DEFAULT now(),
   updated_at timestamptz NOT NULL DEFAULT now(),
   archived_at timestamptz
 );
 
+ALTER TABLE ledgers ADD COLUMN IF NOT EXISTS theme varchar(24) NOT NULL DEFAULT 'jade';
+UPDATE ledgers SET theme = CASE lower(color)
+  WHEN '#3478e5' THEN 'ocean'
+  WHEN '#7559d9' THEN 'berry'
+  WHEN '#f05d3f' THEN 'coral'
+  WHEN '#d84486' THEN 'berry'
+  WHEN '#15956d' THEN 'meadow'
+  ELSE 'jade'
+END WHERE theme = 'jade' AND lower(color) <> '#087f72';
 ALTER TABLE ledgers ADD COLUMN IF NOT EXISTS personal_owner_id text REFERENCES users(id) ON DELETE CASCADE;
 CREATE UNIQUE INDEX IF NOT EXISTS ledgers_personal_owner_unique
   ON ledgers (personal_owner_id) WHERE personal_owner_id IS NOT NULL;
diff --git a/services/api/src/server.ts b/services/api/src/server.ts
index 588fdac..9ca6e40 100644
--- a/services/api/src/server.ts
+++ b/services/api/src/server.ts
@@ -1,7 +1,7 @@
 import cookie from "@fastify/cookie";
 import helmet from "@fastify/helmet";
 import rateLimit from "@fastify/rate-limit";
-import type { LedgerEntry, SyncOperation } from "@cents/domain";
+import { ledgerThemeAccents, type LedgerEntry, type LedgerThemeId, type SyncOperation } from "@cents/domain";
 import Fastify, { type FastifyReply, type FastifyRequest } from "fastify";
 import { createUserWithPersonalLedger, PERSONAL_LEDGER_NAME } from "./accounts.js";
 import { initializeDatabase, pool } from "./db.js";
@@ -117,6 +117,16 @@ function invitationStatus(invitation: { expiresAt: Date | string; acceptedAt: Da
 
 const currencies = new Set(["CNY", "USD", "EUR", "JPY", "HKD"]);
 
+function validLedgerTheme(value: unknown): value is LedgerThemeId {
+  return typeof value === "string" && Object.hasOwn(ledgerThemeAccents, value);
+}
+
+function ledgerThemeFromColor(color: unknown): LedgerThemeId {
+  if (typeof color !== "string") return "jade";
+  return (Object.entries(ledgerThemeAccents) as Array<[LedgerThemeId, string]>)
+    .find(([, accent]) => accent.toLowerCase() === color.toLowerCase())?.[0] ?? "jade";
+}
+
 function validDate(value: unknown) {
   return typeof value === "string" && !Number.isNaN(Date.parse(value));
 }
@@ -231,7 +241,7 @@ server.get("/api/ledgers", async (request, reply) => {
   const user = await requireUser(request, reply);
   if (!user) return;
   const result = await pool.query(
-    `SELECT l.id, l.name, l.color, l.default_currency AS "defaultCurrency",
+    `SELECT l.id, l.name, l.color, l.theme, l.default_currency AS "defaultCurrency",
             l.created_at AS "createdAt", l.updated_at AS "updatedAt",
             l.archived_at AS "archivedAt", m.role,
             (l.personal_owner_id IS NOT NULL) AS "isPersonal"
@@ -243,13 +253,17 @@ server.get("/api/ledgers", async (request, reply) => {
   return { ledgers: result.rows };
 });
 
-server.post<{ Body: { name?: string; color?: string; defaultCurrency?: string } }>(
+server.post<{ Body: { name?: string; color?: string; theme?: string; defaultCurrency?: string } }>(
   "/api/ledgers",
   async (request, reply) => {
     const user = await requireUser(request, reply);
     if (!user) return;
     const name = request.body.name?.trim() ?? "";
-    const color = request.body.color ?? "#087f72";
+    if (request.body.theme !== undefined && !validLedgerTheme(request.body.theme)) {
+      return reply.code(400).send({ error: "账本主题无效" });
+    }
+    const theme = request.body.theme ?? ledgerThemeFromColor(request.body.color);
+    const color = ledgerThemeAccents[theme];
     const defaultCurrency = request.body.defaultCurrency ?? "CNY";
     if (!name || name.length > 40) return reply.code(400).send({ error: "账本名称应为 1 至 40 个字符" });
     if (!/^#[0-9a-f]{6}$/i.test(color)) return reply.code(400).send({ error: "账本颜色无效" });
@@ -262,11 +276,11 @@ server.post<{ Body: { name?: string; color?: string; defaultCurrency?: string }
       await client.query("BEGIN");
       const ledgerId = createId();
       const result = await client.query(
-        `INSERT INTO ledgers (id, name, color, default_currency)
-         VALUES ($1, $2, $3, $4)
-         RETURNING id, name, color, default_currency AS "defaultCurrency",
+        `INSERT INTO ledgers (id, name, color, theme, default_currency)
+         VALUES ($1, $2, $3, $4, $5)
+         RETURNING id, name, color, theme, default_currency AS "defaultCurrency",
                    created_at AS "createdAt", updated_at AS "updatedAt", archived_at AS "archivedAt"`,
-        [ledgerId, name, color, defaultCurrency],
+        [ledgerId, name, color, theme, defaultCurrency],
       );
       await client.query(
         "INSERT INTO ledger_members (ledger_id, user_id, role) VALUES ($1, $2, 'owner')",
@@ -299,7 +313,7 @@ server.get<{ Params: { ledgerId: string } }>("/api/ledgers/:ledgerId/members", a
 
 server.patch<{
   Params: { ledgerId: string };
-  Body: { name?: string; color?: string; defaultCurrency?: string };
+  Body: { name?: string; color?: string; theme?: string; defaultCurrency?: string };
 }>("/api/ledgers/:ledgerId", async (request, reply) => {
   const user = await requireUser(request, reply);
   if (!user) return;
@@ -312,12 +326,17 @@ server.patch<{
   );
   const name = request.body.name?.trim() ?? "";
   if (!name || name.length > 40) return reply.code(400).send({ error: "账本名称无效" });
+  if (request.body.theme !== undefined && !validLedgerTheme(request.body.theme)) {
+    return reply.code(400).send({ error: "账本主题无效" });
+  }
+  const theme = request.body.theme ?? ledgerThemeFromColor(request.body.color);
+  const color = ledgerThemeAccents[theme];
   const result = await pool.query(
-    `UPDATE ledgers SET name = $1, color = $2, default_currency = $3, updated_at = now()
-      WHERE id = $4
-      RETURNING id, name, color, default_currency AS "defaultCurrency",
+    `UPDATE ledgers SET name = $1, color = $2, theme = $3, default_currency = $4, updated_at = now()
+      WHERE id = $5
+      RETURNING id, name, color, theme, default_currency AS "defaultCurrency",
                 created_at AS "createdAt", updated_at AS "updatedAt", archived_at AS "archivedAt"`,
-    [personalLedger.rows[0]?.isPersonal ? PERSONAL_LEDGER_NAME : name, request.body.color ?? "#087f72", request.body.defaultCurrency ?? "CNY", request.params.ledgerId],
+    [personalLedger.rows[0]?.isPersonal ? PERSONAL_LEDGER_NAME : name, color, theme, request.body.defaultCurrency ?? "CNY", request.params.ledgerId],
   );
   return { ledger: result.rows[0] };
 });