diff --git a/src/App.vue b/src/App.vue
index 643b236..de45128 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,11 +1,8 @@
 <script setup lang="ts">
-import SortDropdown from "./components/SortDropdown.vue";
-import {
-  browserIconOptions,
-  browserIconSrc,
-  configurationIconSrc,
-} from "./features/browser-assistant/icons";
-import { useBrowserAssistant } from "./features/browser-assistant/useBrowserAssistant";
+import BrowserDataView from "./components/browser-data/BrowserDataView.vue";
+import ConfigurationView from "./components/config/ConfigurationView.vue";
+import AppSidebar from "./components/sidebar/AppSidebar.vue";
+import { useBrowserManager } from "./composables/useBrowserManager";
 
 const {
   activeSection,
@@ -44,199 +41,42 @@ const {
   sortedProfiles,
   toggleBookmarkProfiles,
   toggleExtensionProfiles,
-} = useBrowserAssistant();
+} = useBrowserManager();
 </script>
 
 <template>
   <div class="app-shell">
-    <aside class="sidebar">
-      <div class="sidebar-toolbar">
-        <div class="sidebar-title-group">
-          <h1>Browser Assistant</h1>
-          <p>Local Chromium profile manager</p>
-        </div>
-      </div>
-
-      <div v-if="browsers.length" class="browser-nav">
-        <button
-          v-for="browser in browsers"
-          :key="browser.browserId"
-          class="browser-nav-item"
-          :class="[browser.browserFamilyId ?? browser.browserId, { active: browser.browserId === currentBrowser?.browserId }]"
-          type="button"
-          @click="selectedBrowserId = browser.browserId; page = 'browserData'"
-        >
-          <div class="browser-nav-icon">
-            <img
-              v-if="browserIconSrc(browser.iconKey ?? browser.browserFamilyId)"
-              :src="browserIconSrc(browser.iconKey ?? browser.browserFamilyId) ?? undefined"
-              :alt="`${browser.browserName} icon`"
-            />
-            <span v-else>{{ browserMonogram(browser.browserId) }}</span>
-          </div>
-          <div class="browser-nav-body">
-            <strong>{{ browser.browserName }}</strong>
-            <span>{{ browser.dataRoot }}</span>
-          </div>
-        </button>
-      </div>
-
-      <div v-else class="sidebar-empty">
-        <p>No supported Chromium browser data was found yet.</p>
-      </div>
-
-      <button
-        class="browser-nav-item utility sidebar-utility-nav"
-        :class="{ active: page === 'configuration' }"
-        type="button"
-        @click="page = 'configuration'"
-      >
-        <div class="browser-nav-icon config-nav-icon">
-          <img :src="configurationIconSrc" alt="Configuration icon" />
-        </div>
-        <div class="browser-nav-body">
-          <strong>Configuration</strong>
-          <span>Manage custom scan sources and paths</span>
-        </div>
-      </button>
-
-      <button class="refresh-button sidebar-refresh" type="button" @click="refreshAll">
-        {{ loading || configsLoading ? "Refreshing..." : "Refresh" }}
-      </button>
-    </aside>
+    <AppSidebar
+      :browsers="browsers"
+      :current-browser-id="currentBrowser?.browserId ?? null"
+      :page="page"
+      :loading="loading"
+      :configs-loading="configsLoading"
+      :browser-monogram="browserMonogram"
+      @select-browser="selectedBrowserId = $event; page = 'browserData'"
+      @select-configuration="page = 'configuration'"
+      @refresh="refreshAll"
+    />
 
     <main class="content-panel">
       <template v-if="page === 'configuration'">
-        <section class="content-scroll-area">
-          <section class="content-section">
-            <div v-if="configError" class="inline-error">
-              {{ configError }}
-            </div>
-
-            <div class="config-form-card">
-              <div class="config-form-header">
-                <h3>Add Custom Browser</h3>
-                <p>Provide a name, executable path, and Chromium user data path.</p>
-              </div>
-              <div class="config-form-layout">
-                <div class="config-form-fields">
-                  <label class="field-group">
-                    <span>Name</span>
-                    <input v-model="createConfigForm.name" placeholder="Work Chrome" />
-                  </label>
-                  <label class="field-group">
-                    <span>Executable Path</span>
-                    <div class="path-input-row">
-                      <input
-                        v-model="createConfigForm.executablePath"
-                        placeholder="C:\Program Files\...\chrome.exe"
-                      />
-                      <button
-                        class="secondary-button"
-                        type="button"
-                        @click="pickExecutablePath"
-                      >
-                        Browse File
-                      </button>
-                    </div>
-                  </label>
-                  <label class="field-group">
-                    <span>User Data Path</span>
-                    <div class="path-input-row">
-                      <input
-                        v-model="createConfigForm.userDataPath"
-                        placeholder="C:\Users\...\User Data"
-                      />
-                      <button
-                        class="secondary-button"
-                        type="button"
-                        @click="pickUserDataPath"
-                      >
-                        Browse Folder
-                      </button>
-                    </div>
-                  </label>
-                </div>
-                <div class="config-form-side">
-                  <label class="field-group">
-                    <span>Icon</span>
-                    <div class="icon-option-grid">
-                      <button
-                        v-for="option in browserIconOptions"
-                        :key="option.key"
-                        class="icon-option-button"
-                        :class="{ active: createConfigForm.iconKey === option.key }"
-                        type="button"
-                        @click="createConfigForm.iconKey = option.key"
-                      >
-                        <img :src="option.src" :alt="option.label" />
-                        <span>{{ option.label }}</span>
-                      </button>
-                    </div>
-                  </label>
-                  <div class="config-form-actions">
-                    <button
-                      class="primary-button"
-                      type="button"
-                      :disabled="savingConfig"
-                      @click="createCustomBrowserConfig"
-                    >
-                      {{ savingConfig ? "Saving..." : "Add Config" }}
-                    </button>
-                  </div>
-                </div>
-              </div>
-            </div>
-
-            <div v-if="configsLoading" class="empty-card">
-              <p>Loading browser configs...</p>
-            </div>
-            <div v-else class="stack-list">
-              <article
-                v-for="config in browserConfigs"
-                :key="config.id"
-                class="config-card"
-              >
-                <div class="config-card-header">
-                  <div class="config-card-lead">
-                    <div class="browser-nav-icon config-icon">
-                      <img
-                        v-if="browserIconSrc(config.iconKey ?? config.browserFamilyId)"
-                        :src="browserIconSrc(config.iconKey ?? config.browserFamilyId) ?? undefined"
-                        :alt="`${config.name} icon`"
-                      />
-                      <span v-else>{{ configMonogram(config) }}</span>
-                    </div>
-                    <div>
-                      <div class="config-title-row">
-                        <h4>{{ config.name }}</h4>
-                      </div>
-                    </div>
-                  </div>
-                  <button
-                    v-if="config.deletable"
-                    class="danger-button"
-                    type="button"
-                    :disabled="isDeletingConfig(config.id)"
-                    @click="deleteCustomBrowserConfig(config.id)"
-                  >
-                    {{ isDeletingConfig(config.id) ? "Deleting..." : "Delete" }}
-                  </button>
-                </div>
-                <div class="config-meta">
-                  <div class="config-meta-row">
-                    <span class="config-label">Executable</span>
-                    <p :title="config.executablePath">{{ config.executablePath || "Not resolved" }}</p>
-                  </div>
-                  <div class="config-meta-row">
-                    <span class="config-label">User Data</span>
-                    <p :title="config.userDataPath">{{ config.userDataPath }}</p>
-                  </div>
-                </div>
-              </article>
-            </div>
-          </section>
-        </section>
+        <ConfigurationView
+          :config-error="configError"
+          :configs-loading="configsLoading"
+          :browser-configs="browserConfigs"
+          :create-config-form="createConfigForm"
+          :saving-config="savingConfig"
+          :config-monogram="configMonogram"
+          :is-deleting-config="isDeletingConfig"
+          @update-name="createConfigForm.name = $event"
+          @update-executable-path="createConfigForm.executablePath = $event"
+          @update-user-data-path="createConfigForm.userDataPath = $event"
+          @update-icon-key="createConfigForm.iconKey = $event"
+          @pick-executable-path="pickExecutablePath"
+          @pick-user-data-path="pickUserDataPath"
+          @create-config="createCustomBrowserConfig"
+          @delete-config="deleteCustomBrowserConfig"
+        />
       </template>
 
       <template v-else-if="loading">
@@ -255,208 +95,31 @@ const {
         </section>
       </template>
 
-      <template v-else-if="currentBrowser">
-        <section class="section-tabs">
-          <button
-            class="section-tab"
-            :class="{ active: activeSection === 'profiles' }"
-            type="button"
-            @click="activeSection = 'profiles'"
-          >
-            <span>Profiles</span>
-            <span class="count-pill">{{ sectionCount("profiles") }}</span>
-          </button>
-          <button
-            class="section-tab"
-            :class="{ active: activeSection === 'extensions' }"
-            type="button"
-            @click="activeSection = 'extensions'"
-          >
-            <span>Extensions</span>
-            <span class="count-pill">{{ sectionCount("extensions") }}</span>
-          </button>
-          <button
-            class="section-tab"
-            :class="{ active: activeSection === 'bookmarks' }"
-            type="button"
-            @click="activeSection = 'bookmarks'"
-          >
-            <span>Bookmarks</span>
-            <span class="count-pill">{{ sectionCount("bookmarks") }}</span>
-          </button>
-        </section>
-
-        <div class="content-scroll-area">
-          <section v-if="activeSection === 'profiles'" class="content-section">
-            <div v-if="openProfileError" class="inline-error">
-              {{ openProfileError }}
-            </div>
-
-            <div class="sort-bar">
-              <SortDropdown
-                v-model="profileSortKey"
-                label="Sort by"
-                :options="[
-                  { label: 'Name', value: 'name' },
-                  { label: 'Email', value: 'email' },
-                  { label: 'Profile ID', value: 'id' },
-                ]"
-              />
-            </div>
-
-            <div v-if="sortedProfiles.length" class="stack-list">
-              <article v-for="profile in sortedProfiles" :key="profile.id" class="profile-card">
-                <div class="profile-avatar">
-                  <img
-                    v-if="profile.avatarDataUrl"
-                    :src="profile.avatarDataUrl"
-                    :alt="`${profile.name} avatar`"
-                  />
-                  <span v-else>{{ profile.avatarLabel }}</span>
-                </div>
-                <div class="profile-body">
-                  <div class="profile-topline">
-                    <h4>{{ profile.name }}</h4>
-                    <div class="profile-actions">
-                      <button
-                        class="card-action-button"
-                        :disabled="isOpeningProfile(currentBrowser.browserId, profile.id)"
-                        type="button"
-                        @click="openBrowserProfile(currentBrowser.browserId, profile.id)"
-                      >
-                        {{
-                          isOpeningProfile(currentBrowser.browserId, profile.id)
-                            ? "Opening..."
-                            : "Open"
-                        }}
-                      </button>
-                      <span class="badge neutral">{{ profile.id }}</span>
-                    </div>
-                  </div>
-                  <p class="profile-email">{{ profile.email || "No email found" }}</p>
-                </div>
-              </article>
-            </div>
-            <div v-else class="empty-card">
-              <p>No profile directories were found for this browser.</p>
-            </div>
-          </section>
-
-          <section v-else-if="activeSection === 'extensions'" class="content-section">
-            <div class="sort-bar">
-              <SortDropdown
-                v-model="extensionSortKey"
-                label="Sort by"
-                :options="[
-                  { label: 'Name', value: 'name' },
-                  { label: 'Extension ID', value: 'id' },
-                ]"
-              />
-            </div>
-
-            <div v-if="sortedExtensions.length" class="stack-list">
-              <article
-                v-for="extension in sortedExtensions"
-                :key="extension.id"
-                class="extension-card"
-              >
-                <div class="extension-icon">
-                  <img
-                    v-if="extension.iconDataUrl"
-                    :src="extension.iconDataUrl"
-                    :alt="`${extension.name} icon`"
-                  />
-                  <span v-else>{{ extensionMonogram(extension.name) }}</span>
-                </div>
-                <div class="extension-body">
-                  <div class="extension-topline">
-                    <h4>{{ extension.name }}</h4>
-                    <span v-if="extension.version" class="badge neutral">
-                      v{{ extension.version }}
-                    </span>
-                  </div>
-                  <p class="meta-line">{{ extension.id }}</p>
-                  <div class="source-disclosure">
-                    <button
-                      class="disclosure-button"
-                      type="button"
-                      @click="toggleExtensionProfiles(extension.id)"
-                    >
-                      <span>Profiles</span>
-                      <span class="badge neutral">{{ extension.profileIds.length }}</span>
-                    </button>
-                    <div
-                      v-if="extensionProfilesExpanded(extension.id)"
-                      class="disclosure-panel"
-                    >
-                      <span
-                        v-for="profileId in extension.profileIds"
-                        :key="`${extension.id}-${profileId}`"
-                        class="badge"
-                      >
-                        {{ profileId }}
-                      </span>
-                    </div>
-                  </div>
-                </div>
-              </article>
-            </div>
-            <div v-else class="empty-card">
-              <p>No extensions were discovered for this browser.</p>
-            </div>
-          </section>
-
-          <section v-else class="content-section">
-            <div class="sort-bar">
-              <SortDropdown
-                v-model="bookmarkSortKey"
-                label="Sort by"
-                :options="[
-                  { label: 'Name', value: 'title' },
-                  { label: 'URL', value: 'url' },
-                ]"
-              />
-            </div>
-
-            <div v-if="sortedBookmarks.length" class="bookmark-list">
-              <article v-for="bookmark in sortedBookmarks" :key="bookmark.url" class="bookmark-card">
-                <div class="bookmark-body">
-                  <div class="bookmark-topline">
-                    <h4>{{ bookmark.title }}</h4>
-                    <span class="badge neutral">{{ domainFromUrl(bookmark.url) }}</span>
-                  </div>
-                  <p class="bookmark-url" :title="bookmark.url">{{ bookmark.url }}</p>
-                  <div class="source-disclosure">
-                    <button
-                      class="disclosure-button"
-                      type="button"
-                      @click="toggleBookmarkProfiles(bookmark.url)"
-                    >
-                      <span>Profiles</span>
-                      <span class="badge neutral">{{ bookmark.profileIds.length }}</span>
-                    </button>
-                    <div
-                      v-if="bookmarkProfilesExpanded(bookmark.url)"
-                      class="disclosure-panel"
-                    >
-                      <span
-                        v-for="profileId in bookmark.profileIds"
-                        :key="`${bookmark.url}-${profileId}`"
-                        class="badge"
-                      >
-                        {{ profileId }}
-                      </span>
-                    </div>
-                  </div>
-                </div>
-              </article>
-            </div>
-            <div v-else class="empty-card">
-              <p>No bookmarks were discovered for this browser.</p>
-            </div>
-          </section>
-        </div>
-      </template>
+      <BrowserDataView
+        v-else-if="currentBrowser"
+        :current-browser="currentBrowser"
+        :active-section="activeSection"
+        :profile-sort-key="profileSortKey"
+        :extension-sort-key="extensionSortKey"
+        :bookmark-sort-key="bookmarkSortKey"
+        :sorted-profiles="sortedProfiles"
+        :sorted-extensions="sortedExtensions"
+        :sorted-bookmarks="sortedBookmarks"
+        :open-profile-error="openProfileError"
+        :section-count="sectionCount"
+        :is-opening-profile="isOpeningProfile"
+        :extension-monogram="extensionMonogram"
+        :extension-profiles-expanded="extensionProfilesExpanded"
+        :bookmark-profiles-expanded="bookmarkProfilesExpanded"
+        :domain-from-url="domainFromUrl"
+        @update:active-section="activeSection = $event"
+        @update:profile-sort-key="profileSortKey = $event"
+        @update:extension-sort-key="extensionSortKey = $event"
+        @update:bookmark-sort-key="bookmarkSortKey = $event"
+        @open-profile="(browserId, profileId) => openBrowserProfile(browserId, profileId)"
+        @toggle-extension-profiles="toggleExtensionProfiles"
+        @toggle-bookmark-profiles="toggleBookmarkProfiles"
+      />
 
       <template v-else>
         <section class="state-panel">
diff --git a/src/components/browser-data/BookmarksList.vue b/src/components/browser-data/BookmarksList.vue
new file mode 100644
index 0000000..0cea5e0
--- /dev/null
+++ b/src/components/browser-data/BookmarksList.vue
@@ -0,0 +1,69 @@
+<script setup lang="ts">
+import SortDropdown from "../SortDropdown.vue";
+import type { BookmarkSortKey, BookmarkSummary } from "../../types/browser";
+
+defineProps<{
+  bookmarks: BookmarkSummary[];
+  sortKey: BookmarkSortKey;
+  domainFromUrl: (url: string) => string;
+  bookmarkProfilesExpanded: (url: string) => boolean;
+}>();
+
+const emit = defineEmits<{
+  "update:sortKey": [value: BookmarkSortKey];
+  toggleProfiles: [url: string];
+}>();
+</script>
+
+<template>
+  <section class="content-section">
+    <div class="sort-bar">
+      <SortDropdown
+        :model-value="sortKey"
+        label="Sort by"
+        :options="[
+          { label: 'Name', value: 'title' },
+          { label: 'URL', value: 'url' },
+        ]"
+        @update:model-value="emit('update:sortKey', $event as BookmarkSortKey)"
+      />
+    </div>
+
+    <div v-if="bookmarks.length" class="bookmark-list">
+      <article v-for="bookmark in bookmarks" :key="bookmark.url" class="bookmark-card">
+        <div class="bookmark-body">
+          <div class="bookmark-topline">
+            <h4>{{ bookmark.title }}</h4>
+            <span class="badge neutral">{{ domainFromUrl(bookmark.url) }}</span>
+          </div>
+          <p class="bookmark-url" :title="bookmark.url">{{ bookmark.url }}</p>
+          <div class="source-disclosure">
+            <button
+              class="disclosure-button"
+              type="button"
+              @click="emit('toggleProfiles', bookmark.url)"
+            >
+              <span>Profiles</span>
+              <span class="badge neutral">{{ bookmark.profileIds.length }}</span>
+            </button>
+            <div
+              v-if="bookmarkProfilesExpanded(bookmark.url)"
+              class="disclosure-panel"
+            >
+              <span
+                v-for="profileId in bookmark.profileIds"
+                :key="`${bookmark.url}-${profileId}`"
+                class="badge"
+              >
+                {{ profileId }}
+              </span>
+            </div>
+          </div>
+        </div>
+      </article>
+    </div>
+    <div v-else class="empty-card">
+      <p>No bookmarks were discovered for this browser.</p>
+    </div>
+  </section>
+</template>
diff --git a/src/components/browser-data/BrowserDataView.vue b/src/components/browser-data/BrowserDataView.vue
new file mode 100644
index 0000000..bfccd8a
--- /dev/null
+++ b/src/components/browser-data/BrowserDataView.vue
@@ -0,0 +1,105 @@
+<script setup lang="ts">
+import type {
+  ActiveSection,
+  BookmarkSortKey,
+  BrowserView,
+  ExtensionSortKey,
+  ProfileSortKey,
+} from "../../types/browser";
+import BookmarksList from "./BookmarksList.vue";
+import ExtensionsList from "./ExtensionsList.vue";
+import ProfilesList from "./ProfilesList.vue";
+
+defineProps<{
+  currentBrowser: BrowserView;
+  activeSection: ActiveSection;
+  profileSortKey: ProfileSortKey;
+  extensionSortKey: ExtensionSortKey;
+  bookmarkSortKey: BookmarkSortKey;
+  sortedProfiles: BrowserView["profiles"];
+  sortedExtensions: BrowserView["extensions"];
+  sortedBookmarks: BrowserView["bookmarks"];
+  openProfileError: string;
+  sectionCount: (section: ActiveSection) => number;
+  isOpeningProfile: (browserId: string, profileId: string) => boolean;
+  extensionMonogram: (name: string) => string;
+  extensionProfilesExpanded: (extensionId: string) => boolean;
+  bookmarkProfilesExpanded: (url: string) => boolean;
+  domainFromUrl: (url: string) => string;
+}>();
+
+const emit = defineEmits<{
+  "update:activeSection": [value: ActiveSection];
+  "update:profileSortKey": [value: ProfileSortKey];
+  "update:extensionSortKey": [value: ExtensionSortKey];
+  "update:bookmarkSortKey": [value: BookmarkSortKey];
+  openProfile: [browserId: string, profileId: string];
+  toggleExtensionProfiles: [extensionId: string];
+  toggleBookmarkProfiles: [url: string];
+}>();
+</script>
+
+<template>
+  <section class="section-tabs">
+    <button
+      class="section-tab"
+      :class="{ active: activeSection === 'profiles' }"
+      type="button"
+      @click="emit('update:activeSection', 'profiles')"
+    >
+      <span>Profiles</span>
+      <span class="count-pill">{{ sectionCount("profiles") }}</span>
+    </button>
+    <button
+      class="section-tab"
+      :class="{ active: activeSection === 'extensions' }"
+      type="button"
+      @click="emit('update:activeSection', 'extensions')"
+    >
+      <span>Extensions</span>
+      <span class="count-pill">{{ sectionCount("extensions") }}</span>
+    </button>
+    <button
+      class="section-tab"
+      :class="{ active: activeSection === 'bookmarks' }"
+      type="button"
+      @click="emit('update:activeSection', 'bookmarks')"
+    >
+      <span>Bookmarks</span>
+      <span class="count-pill">{{ sectionCount("bookmarks") }}</span>
+    </button>
+  </section>
+
+  <div class="content-scroll-area">
+    <ProfilesList
+      v-if="activeSection === 'profiles'"
+      :profiles="sortedProfiles"
+      :sort-key="profileSortKey"
+      :open-profile-error="openProfileError"
+      :browser-id="currentBrowser.browserId"
+      :is-opening-profile="isOpeningProfile"
+      @update:sort-key="emit('update:profileSortKey', $event)"
+      @open-profile="(browserId, profileId) => emit('openProfile', browserId, profileId)"
+    />
+
+    <ExtensionsList
+      v-else-if="activeSection === 'extensions'"
+      :extensions="sortedExtensions"
+      :sort-key="extensionSortKey"
+      :extension-monogram="extensionMonogram"
+      :extension-profiles-expanded="extensionProfilesExpanded"
+      @update:sort-key="emit('update:extensionSortKey', $event)"
+      @toggle-profiles="emit('toggleExtensionProfiles', $event)"
+    />
+
+    <BookmarksList
+      v-else
+      :bookmarks="sortedBookmarks"
+      :sort-key="bookmarkSortKey"
+      :domain-from-url="domainFromUrl"
+      :bookmark-profiles-expanded="bookmarkProfilesExpanded"
+      @update:sort-key="emit('update:bookmarkSortKey', $event)"
+      @toggle-profiles="emit('toggleBookmarkProfiles', $event)"
+    />
+  </div>
+</template>
diff --git a/src/components/browser-data/ExtensionsList.vue b/src/components/browser-data/ExtensionsList.vue
new file mode 100644
index 0000000..2e40267
--- /dev/null
+++ b/src/components/browser-data/ExtensionsList.vue
@@ -0,0 +1,83 @@
+<script setup lang="ts">
+import SortDropdown from "../SortDropdown.vue";
+import type { ExtensionSortKey, ExtensionSummary } from "../../types/browser";
+
+defineProps<{
+  extensions: ExtensionSummary[];
+  sortKey: ExtensionSortKey;
+  extensionMonogram: (name: string) => string;
+  extensionProfilesExpanded: (extensionId: string) => boolean;
+}>();
+
+const emit = defineEmits<{
+  "update:sortKey": [value: ExtensionSortKey];
+  toggleProfiles: [extensionId: string];
+}>();
+</script>
+
+<template>
+  <section class="content-section">
+    <div class="sort-bar">
+      <SortDropdown
+        :model-value="sortKey"
+        label="Sort by"
+        :options="[
+          { label: 'Name', value: 'name' },
+          { label: 'Extension ID', value: 'id' },
+        ]"
+        @update:model-value="emit('update:sortKey', $event as ExtensionSortKey)"
+      />
+    </div>
+
+    <div v-if="extensions.length" class="stack-list">
+      <article
+        v-for="extension in extensions"
+        :key="extension.id"
+        class="extension-card"
+      >
+        <div class="extension-icon">
+          <img
+            v-if="extension.iconDataUrl"
+            :src="extension.iconDataUrl"
+            :alt="`${extension.name} icon`"
+          />
+          <span v-else>{{ extensionMonogram(extension.name) }}</span>
+        </div>
+        <div class="extension-body">
+          <div class="extension-topline">
+            <h4>{{ extension.name }}</h4>
+            <span v-if="extension.version" class="badge neutral">
+              v{{ extension.version }}
+            </span>
+          </div>
+          <p class="meta-line">{{ extension.id }}</p>
+          <div class="source-disclosure">
+            <button
+              class="disclosure-button"
+              type="button"
+              @click="emit('toggleProfiles', extension.id)"
+            >
+              <span>Profiles</span>
+              <span class="badge neutral">{{ extension.profileIds.length }}</span>
+            </button>
+            <div
+              v-if="extensionProfilesExpanded(extension.id)"
+              class="disclosure-panel"
+            >
+              <span
+                v-for="profileId in extension.profileIds"
+                :key="`${extension.id}-${profileId}`"
+                class="badge"
+              >
+                {{ profileId }}
+              </span>
+            </div>
+          </div>
+        </div>
+      </article>
+    </div>
+    <div v-else class="empty-card">
+      <p>No extensions were discovered for this browser.</p>
+    </div>
+  </section>
+</template>
diff --git a/src/components/browser-data/ProfilesList.vue b/src/components/browser-data/ProfilesList.vue
new file mode 100644
index 0000000..ec9e171
--- /dev/null
+++ b/src/components/browser-data/ProfilesList.vue
@@ -0,0 +1,71 @@
+<script setup lang="ts">
+import SortDropdown from "../SortDropdown.vue";
+import type { ProfileSortKey, ProfileSummary } from "../../types/browser";
+
+defineProps<{
+  profiles: ProfileSummary[];
+  sortKey: ProfileSortKey;
+  openProfileError: string;
+  browserId: string;
+  isOpeningProfile: (browserId: string, profileId: string) => boolean;
+}>();
+
+const emit = defineEmits<{
+  "update:sortKey": [value: ProfileSortKey];
+  openProfile: [browserId: string, profileId: string];
+}>();
+</script>
+
+<template>
+  <section class="content-section">
+    <div v-if="openProfileError" class="inline-error">
+      {{ openProfileError }}
+    </div>
+
+    <div class="sort-bar">
+      <SortDropdown
+        :model-value="sortKey"
+        label="Sort by"
+        :options="[
+          { label: 'Name', value: 'name' },
+          { label: 'Email', value: 'email' },
+          { label: 'Profile ID', value: 'id' },
+        ]"
+        @update:model-value="emit('update:sortKey', $event as ProfileSortKey)"
+      />
+    </div>
+
+    <div v-if="profiles.length" class="stack-list">
+      <article v-for="profile in profiles" :key="profile.id" class="profile-card">
+        <div class="profile-avatar">
+          <img
+            v-if="profile.avatarDataUrl"
+            :src="profile.avatarDataUrl"
+            :alt="`${profile.name} avatar`"
+          />
+          <span v-else>{{ profile.avatarLabel }}</span>
+        </div>
+        <div class="profile-body">
+          <div class="profile-topline">
+            <h4>{{ profile.name }}</h4>
+            <div class="profile-actions">
+              <button
+                class="card-action-button"
+                :disabled="isOpeningProfile(browserId, profile.id)"
+                type="button"
+                @click="emit('openProfile', browserId, profile.id)"
+              >
+                {{ isOpeningProfile(browserId, profile.id) ? "Opening..." : "Open" }}
+              </button>
+              <span class="badge neutral">{{ profile.id }}</span>
+            </div>
+          </div>
+          <p class="profile-email">{{ profile.email || "No email found" }}</p>
+        </div>
+      </article>
+    </div>
+    <div v-else class="empty-card">
+      <p>No profile directories were found for this browser.</p>
+    </div>
+  </section>
+</template>
diff --git a/src/components/config/ConfigurationView.vue b/src/components/config/ConfigurationView.vue
new file mode 100644
index 0000000..33d87ff
--- /dev/null
+++ b/src/components/config/ConfigurationView.vue
@@ -0,0 +1,156 @@
+<script setup lang="ts">
+import { browserIconOptions, browserIconSrc } from "../../utils/icons";
+import type { BrowserConfigEntry, CreateCustomBrowserConfigInput } from "../../types/browser";
+
+defineProps<{
+  configError: string;
+  configsLoading: boolean;
+  browserConfigs: BrowserConfigEntry[];
+  createConfigForm: CreateCustomBrowserConfigInput;
+  savingConfig: boolean;
+  configMonogram: (config: BrowserConfigEntry) => string;
+  isDeletingConfig: (configId: string) => boolean;
+}>();
+
+const emit = defineEmits<{
+  updateName: [value: string];
+  updateExecutablePath: [value: string];
+  updateUserDataPath: [value: string];
+  updateIconKey: [value: string];
+  pickExecutablePath: [];
+  pickUserDataPath: [];
+  createConfig: [];
+  deleteConfig: [configId: string];
+}>();
+</script>
+
+<template>
+  <section class="content-scroll-area">
+    <section class="content-section">
+      <div v-if="configError" class="inline-error">
+        {{ configError }}
+      </div>
+
+      <div class="config-form-card">
+        <div class="config-form-header">
+          <h3>Add Custom Browser</h3>
+          <p>Provide a name, executable path, and Chromium user data path.</p>
+        </div>
+        <div class="config-form-layout">
+          <div class="config-form-fields">
+            <label class="field-group">
+              <span>Name</span>
+              <input
+                :value="createConfigForm.name"
+                placeholder="Work Chrome"
+                @input="emit('updateName', ($event.target as HTMLInputElement).value)"
+              />
+            </label>
+            <label class="field-group">
+              <span>Executable Path</span>
+              <div class="path-input-row">
+                <input
+                  :value="createConfigForm.executablePath"
+                  placeholder="C:\Program Files\...\chrome.exe"
+                  @input="emit('updateExecutablePath', ($event.target as HTMLInputElement).value)"
+                />
+                <button class="secondary-button" type="button" @click="emit('pickExecutablePath')">
+                  Browse File
+                </button>
+              </div>
+            </label>
+            <label class="field-group">
+              <span>User Data Path</span>
+              <div class="path-input-row">
+                <input
+                  :value="createConfigForm.userDataPath"
+                  placeholder="C:\Users\...\User Data"
+                  @input="emit('updateUserDataPath', ($event.target as HTMLInputElement).value)"
+                />
+                <button class="secondary-button" type="button" @click="emit('pickUserDataPath')">
+                  Browse Folder
+                </button>
+              </div>
+            </label>
+          </div>
+          <div class="config-form-side">
+            <label class="field-group">
+              <span>Icon</span>
+              <div class="icon-option-grid">
+                <button
+                  v-for="option in browserIconOptions"
+                  :key="option.key"
+                  class="icon-option-button"
+                  :class="{ active: createConfigForm.iconKey === option.key }"
+                  type="button"
+                  @click="emit('updateIconKey', option.key)"
+                >
+                  <img :src="option.src" :alt="option.label" />
+                  <span>{{ option.label }}</span>
+                </button>
+              </div>
+            </label>
+            <div class="config-form-actions">
+              <button
+                class="primary-button"
+                type="button"
+                :disabled="savingConfig"
+                @click="emit('createConfig')"
+              >
+                {{ savingConfig ? "Saving..." : "Add Config" }}
+              </button>
+            </div>
+          </div>
+        </div>
+      </div>
+
+      <div v-if="configsLoading" class="empty-card">
+        <p>Loading browser configs...</p>
+      </div>
+      <div v-else class="stack-list">
+        <article
+          v-for="config in browserConfigs"
+          :key="config.id"
+          class="config-card"
+        >
+          <div class="config-card-header">
+            <div class="config-card-lead">
+              <div class="browser-nav-icon config-icon">
+                <img
+                  v-if="browserIconSrc(config.iconKey ?? config.browserFamilyId)"
+                  :src="browserIconSrc(config.iconKey ?? config.browserFamilyId) ?? undefined"
+                  :alt="`${config.name} icon`"
+                />
+                <span v-else>{{ configMonogram(config) }}</span>
+              </div>
+              <div>
+                <div class="config-title-row">
+                  <h4>{{ config.name }}</h4>
+                </div>
+              </div>
+            </div>
+            <button
+              v-if="config.deletable"
+              class="danger-button"
+              type="button"
+              :disabled="isDeletingConfig(config.id)"
+              @click="emit('deleteConfig', config.id)"
+            >
+              {{ isDeletingConfig(config.id) ? "Deleting..." : "Delete" }}
+            </button>
+          </div>
+          <div class="config-meta">
+            <div class="config-meta-row">
+              <span class="config-label">Executable</span>
+              <p :title="config.executablePath">{{ config.executablePath || "Not resolved" }}</p>
+            </div>
+            <div class="config-meta-row">
+              <span class="config-label">User Data</span>
+              <p :title="config.userDataPath">{{ config.userDataPath }}</p>
+            </div>
+          </div>
+        </article>
+      </div>
+    </section>
+  </section>
+</template>
diff --git a/src/components/sidebar/AppSidebar.vue b/src/components/sidebar/AppSidebar.vue
new file mode 100644
index 0000000..ab49038
--- /dev/null
+++ b/src/components/sidebar/AppSidebar.vue
@@ -0,0 +1,77 @@
+<script setup lang="ts">
+import { browserIconSrc, configurationIconSrc } from "../../utils/icons";
+import type { AppPage, BrowserView } from "../../types/browser";
+
+defineProps<{
+  browsers: BrowserView[];
+  currentBrowserId: string | null;
+  page: AppPage;
+  loading: boolean;
+  configsLoading: boolean;
+  browserMonogram: (browserId: string) => string;
+}>();
+
+const emit = defineEmits<{
+  selectBrowser: [browserId: string];
+  selectConfiguration: [];
+  refresh: [];
+}>();
+</script>
+
+<template>
+  <aside class="sidebar">
+    <div class="sidebar-toolbar">
+      <div class="sidebar-title-group">
+        <h1>Browser Assistant</h1>
+        <p>Local Chromium profile manager</p>
+      </div>
+    </div>
+
+    <div v-if="browsers.length" class="browser-nav">
+      <button
+        v-for="browser in browsers"
+        :key="browser.browserId"
+        class="browser-nav-item"
+        :class="[browser.browserFamilyId ?? browser.browserId, { active: browser.browserId === currentBrowserId && page === 'browserData' }]"
+        type="button"
+        @click="emit('selectBrowser', browser.browserId)"
+      >
+        <div class="browser-nav-icon">
+          <img
+            v-if="browserIconSrc(browser.iconKey ?? browser.browserFamilyId)"
+            :src="browserIconSrc(browser.iconKey ?? browser.browserFamilyId) ?? undefined"
+            :alt="`${browser.browserName} icon`"
+          />
+          <span v-else>{{ browserMonogram(browser.browserId) }}</span>
+        </div>
+        <div class="browser-nav-body">
+          <strong>{{ browser.browserName }}</strong>
+          <span>{{ browser.dataRoot }}</span>
+        </div>
+      </button>
+    </div>
+
+    <div v-else class="sidebar-empty">
+      <p>No supported Chromium browser data was found yet.</p>
+    </div>
+
+    <button
+      class="browser-nav-item utility sidebar-utility-nav"
+      :class="{ active: page === 'configuration' }"
+      type="button"
+      @click="emit('selectConfiguration')"
+    >
+      <div class="browser-nav-icon config-nav-icon">
+        <img :src="configurationIconSrc" alt="Configuration icon" />
+      </div>
+      <div class="browser-nav-body">
+        <strong>Configuration</strong>
+        <span>Manage custom scan sources and paths</span>
+      </div>
+    </button>
+
+    <button class="refresh-button sidebar-refresh" type="button" @click="emit('refresh')">
+      {{ loading || configsLoading ? "Refreshing..." : "Refresh" }}
+    </button>
+  </aside>
+</template>
diff --git a/src/features/browser-assistant/useBrowserAssistant.ts b/src/composables/useBrowserManager.ts
similarity index 98%
rename from src/features/browser-assistant/useBrowserAssistant.ts
rename to src/composables/useBrowserManager.ts
index 868f332..b05a8c9 100644
--- a/src/features/browser-assistant/useBrowserAssistant.ts
+++ b/src/composables/useBrowserManager.ts
@@ -2,7 +2,7 @@ import { computed, onMounted, ref, watch } from "vue";
 import { invoke } from "@tauri-apps/api/core";
 import { open } from "@tauri-apps/plugin-dialog";
 
-import { sortBookmarks, sortExtensions, sortProfiles } from "./sort";
+import { sortBookmarks, sortExtensions, sortProfiles } from "../utils/sort";
 import type {
   ActiveSection,
   AppPage,
@@ -14,9 +14,9 @@ import type {
   ExtensionSortKey,
   ProfileSortKey,
   ScanResponse,
-} from "./types";
+} from "../types/browser";
 
-export function useBrowserAssistant() {
+export function useBrowserManager() {
   const page = ref<AppPage>("browserData");
   const loading = ref(true);
   const error = ref("");
diff --git a/src/styles.css b/src/styles.css
index e8c59e0..f0313ef 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -1,954 +1,2 @@
-:root {
-  color: #15202b;
-  background:
-    radial-gradient(circle at top left, rgba(108, 145, 255, 0.16), transparent 32%),
-    radial-gradient(circle at top right, rgba(16, 185, 129, 0.14), transparent 24%),
-    linear-gradient(180deg, #f5f8fc 0%, #edf2f7 100%);
-  font-family:
-    "Segoe UI Variable Text",
-    "Segoe UI",
-    "PingFang SC",
-    "Microsoft YaHei UI",
-    sans-serif;
-  font-synthesis: none;
-  text-rendering: optimizeLegibility;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-  --panel: rgba(255, 255, 255, 0.76);
-  --panel-strong: rgba(255, 255, 255, 0.94);
-  --panel-border: rgba(148, 163, 184, 0.18);
-  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
-  --text: #0f172a;
-  --muted: #526277;
-  --muted-soft: #7b8aa2;
-  --badge-bg: rgba(226, 232, 240, 0.7);
-  --badge-text: #344256;
-  --accent: #2f6fed;
-  --accent-soft: rgba(47, 111, 237, 0.12);
-  --chrome: #2563eb;
-  --edge: #0891b2;
-  --brave: #ea580c;
-}
-
-* {
-  box-sizing: border-box;
-}
-
-html,
-body,
-#app {
-  margin: 0;
-  min-height: 100%;
-}
-
-body {
-  min-height: 100vh;
-  color: var(--text);
-}
-
-button,
-input,
-textarea,
-select {
-  font: inherit;
-}
-
-button {
-  border: 0;
-}
-
-.app-shell {
-  display: grid;
-  grid-template-columns: 320px minmax(0, 1fr);
-  height: 100vh;
-  padding: 14px;
-  gap: 14px;
-  overflow: hidden;
-}
-
-.sidebar,
-.content-panel {
-  backdrop-filter: blur(20px);
-  -webkit-backdrop-filter: blur(20px);
-}
-
-.sidebar {
-  display: flex;
-  flex-direction: column;
-  gap: 12px;
-  padding: 20px 16px;
-  min-height: 0;
-  border: 1px solid var(--panel-border);
-  border-radius: 22px;
-  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(248, 250, 252, 0.7));
-  box-shadow: var(--shadow);
-}
-
-.sidebar-toolbar h1,
-.state-panel h2,
-.profile-topline h4,
-.extension-topline h4,
-.bookmark-topline h4 {
-  margin: 0;
-  font-weight: 600;
-  letter-spacing: -0.03em;
-}
-
-.sidebar-toolbar {
-  display: flex;
-  align-items: flex-start;
-  justify-content: space-between;
-  gap: 12px;
-  padding: 2px 2px 8px;
-}
-
-.sidebar-title-group {
-  min-width: 0;
-}
-
-.sidebar-toolbar h1 {
-  font-size: 1.52rem;
-  line-height: 1.02;
-  letter-spacing: -0.04em;
-}
-
-.sidebar-title-group p {
-  margin: 6px 0 0;
-  color: var(--muted);
-  font-size: 0.84rem;
-  line-height: 1.35;
-}
-
-.state-panel p,
-.meta-line,
-.profile-email,
-.bookmark-url,
-.browser-nav-body span,
-.sidebar-empty p {
-  margin: 0;
-  color: var(--muted);
-}
-
-.refresh-button {
-  flex-shrink: 0;
-  margin-top: 2px;
-  padding: 9px 13px;
-  border-radius: 12px;
-  background: linear-gradient(135deg, #10213f 0%, #213f75 100%);
-  color: #fff;
-  cursor: pointer;
-  font-size: 0.86rem;
-  font-weight: 600;
-  transition:
-    transform 160ms ease,
-    box-shadow 160ms ease;
-  box-shadow: 0 12px 24px rgba(20, 44, 82, 0.18);
-}
-
-.refresh-button:hover {
-  transform: translateY(-1px);
-}
-
-.browser-nav {
-  display: flex;
-  flex-direction: column;
-  gap: 8px;
-  min-height: 0;
-  overflow: auto;
-  padding-right: 2px;
-}
-
-.browser-nav-item {
-  display: flex;
-  align-items: center;
-  gap: 14px;
-  width: 100%;
-  padding: 11px;
-  border-radius: 16px;
-  text-align: left;
-  cursor: pointer;
-  background: rgba(255, 255, 255, 0.54);
-  border: 1px solid transparent;
-  transition:
-    transform 160ms ease,
-    border-color 160ms ease,
-    background 160ms ease;
-}
-
-.browser-nav-item:hover {
-  transform: translateY(-1px);
-  border-color: var(--panel-border);
-}
-
-.browser-nav-item.active {
-  background: var(--accent-soft);
-  border-color: rgba(47, 111, 237, 0.18);
-}
-
-.browser-nav-item.chrome.active {
-  background: rgba(37, 99, 235, 0.12);
-}
-
-.browser-nav-item.edge.active {
-  background: rgba(8, 145, 178, 0.12);
-}
-
-.browser-nav-item.brave.active {
-  background: rgba(234, 88, 12, 0.12);
-}
-
-.browser-nav-item.utility.active {
-  background: rgba(15, 23, 42, 0.08);
-  border-color: rgba(15, 23, 42, 0.1);
-}
-
-.browser-nav-icon,
-.profile-avatar,
-.extension-icon {
-  display: grid;
-  place-items: center;
-  flex-shrink: 0;
-  overflow: hidden;
-}
-
-.browser-nav-icon {
-  width: 42px;
-  height: 42px;
-  border-radius: 0;
-  color: #fff;
-  font-weight: 700;
-  font-size: 0.86rem;
-  letter-spacing: 0.08em;
-  background: transparent;
-  overflow: visible;
-}
-
-.browser-nav-icon img,
-.config-icon img {
-  display: block;
-  width: auto;
-  height: auto;
-  object-fit: contain;
-}
-
-.browser-nav-icon img {
-  max-width: 38px;
-  max-height: 38px;
-}
-
-.config-icon img {
-  max-width: 26px;
-  max-height: 26px;
-}
-
-.config-nav-icon {
-  background: transparent;
-}
-
-.sidebar-utility-nav {
-  margin-top: auto;
-}
-
-.browser-nav-body {
-  min-width: 0;
-}
-
-.browser-nav-body strong {
-  display: block;
-  color: var(--text);
-}
-
-.browser-nav-body span {
-  display: block;
-  margin-top: 2px;
-  font-size: 0.8rem;
-  line-height: 1.4;
-  white-space: nowrap;
-  overflow: hidden;
-  text-overflow: ellipsis;
-}
-
-.sidebar-empty {
-  padding: 14px;
-  border-radius: 14px;
-  background: rgba(255, 255, 255, 0.58);
-  border: 1px dashed rgba(148, 163, 184, 0.35);
-}
-
-.content-panel {
-  display: flex;
-  flex-direction: column;
-  gap: 10px;
-  min-height: 0;
-  padding: 4px 0;
-  overflow: hidden;
-}
-
-.section-tabs,
-.content-section,
-.state-panel {
-  border: 1px solid var(--panel-border);
-  border-radius: 22px;
-  background: var(--panel);
-  box-shadow: var(--shadow);
-}
-
-.content-section {
-  padding: 16px;
-}
-
-.inline-error {
-  margin-bottom: 12px;
-  padding: 10px 12px;
-  border: 1px solid rgba(239, 68, 68, 0.18);
-  border-radius: 12px;
-  background: rgba(254, 242, 242, 0.92);
-  color: #b42318;
-  font-size: 0.86rem;
-}
-
-.config-form-card,
-.config-card {
-  border-radius: 18px;
-  padding: 12px;
-  border: 1px solid rgba(148, 163, 184, 0.18);
-  background: var(--panel-strong);
-}
-
-.config-form-header h3,
-.config-title-row h4 {
-  margin: 0;
-  font-size: 0.94rem;
-}
-
-.config-form-header p,
-.config-meta-row p {
-  margin: 6px 0 0;
-  color: var(--muted);
-  font-size: 0.82rem;
-}
-
-.config-form-grid {
-  display: none;
-}
-
-.config-form-layout {
-  display: grid;
-  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.95fr);
-  gap: 14px;
-  margin-top: 12px;
-}
-
-.config-form-fields,
-.config-form-side {
-  display: grid;
-  gap: 10px;
-}
-
-.config-form-side {
-  align-content: start;
-  padding: 10px 12px;
-  border-radius: 16px;
-  background: linear-gradient(180deg, rgba(248, 250, 252, 0.95), rgba(241, 245, 249, 0.8));
-  border: 1px solid rgba(148, 163, 184, 0.14);
-}
-
-.icon-option-grid {
-  display: grid;
-  grid-template-columns: repeat(3, minmax(0, 1fr));
-  gap: 8px;
-}
-
-.icon-option-button {
-  display: grid;
-  grid-template-columns: 24px minmax(0, 1fr);
-  align-items: center;
-  column-gap: 8px;
-  min-height: 0;
-  padding: 8px 10px;
-  border: 1px solid rgba(148, 163, 184, 0.2);
-  border-radius: 12px;
-  background: rgba(255, 255, 255, 0.9);
-  color: var(--text);
-  cursor: pointer;
-  transition:
-    border-color 160ms ease,
-    background 160ms ease,
-    box-shadow 160ms ease;
-}
-
-.icon-option-button img {
-  width: 22px;
-  height: 22px;
-  object-fit: contain;
-}
-
-.icon-option-button span {
-  font-size: 0.75rem;
-  font-weight: 600;
-  text-align: left;
-  line-height: 1.2;
-}
-
-.icon-option-button.active {
-  border-color: rgba(47, 111, 237, 0.3);
-  background: rgba(232, 240, 255, 0.8);
-  box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.1);
-}
-
-.field-group {
-  display: grid;
-  gap: 6px;
-}
-
-.path-input-row {
-  display: grid;
-  grid-template-columns: minmax(0, 1fr) auto;
-  gap: 10px;
-}
-
-.field-group span,
-.config-label {
-  color: var(--muted);
-  font-size: 0.8rem;
-  font-weight: 600;
-}
-
-.field-group input {
-  width: 100%;
-  padding: 9px 11px;
-  border: 1px solid rgba(148, 163, 184, 0.24);
-  border-radius: 12px;
-  background: rgba(255, 255, 255, 0.94);
-  color: var(--text);
-  outline: none;
-}
-
-.field-group input:focus {
-  border-color: rgba(47, 111, 237, 0.42);
-  box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.12);
-}
-
-.field-span {
-  grid-column: 1 / -1;
-}
-
-.config-form-actions {
-  display: flex;
-  justify-content: flex-end;
-  margin-top: 2px;
-}
-
-.primary-button,
-.secondary-button,
-.danger-button {
-  padding: 9px 14px;
-  border-radius: 12px;
-  font-size: 0.84rem;
-  font-weight: 600;
-  cursor: pointer;
-}
-
-.primary-button {
-  background: linear-gradient(135deg, #10213f 0%, #213f75 100%);
-  color: #fff;
-}
-
-.secondary-button {
-  border: 1px solid rgba(148, 163, 184, 0.24);
-  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(241, 245, 249, 0.92));
-  color: var(--text);
-}
-
-.danger-button {
-  border: 1px solid rgba(239, 68, 68, 0.18);
-  background: rgba(254, 242, 242, 0.96);
-  color: #b42318;
-}
-
-.primary-button:disabled,
-.secondary-button:disabled,
-.danger-button:disabled {
-  cursor: default;
-  opacity: 0.72;
-}
-
-.config-card-header,
-.config-title-row {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  gap: 10px;
-}
-
-.config-card-lead {
-  display: flex;
-  align-items: center;
-  gap: 10px;
-  min-width: 0;
-  flex: 1;
-}
-
-.config-icon {
-  width: 30px;
-  height: 30px;
-  border-radius: 0;
-  font-size: 0.74rem;
-  overflow: visible;
-}
-
-.config-meta {
-  display: grid;
-  grid-template-columns: repeat(2, minmax(0, 1fr));
-  gap: 12px;
-  margin-top: 10px;
-}
-
-.config-meta-row {
-  display: grid;
-  gap: 3px;
-  padding: 10px 12px;
-  border-radius: 12px;
-  background: rgba(248, 250, 252, 0.78);
-  border: 1px solid rgba(148, 163, 184, 0.12);
-}
-
-.config-meta-row p {
-  white-space: nowrap;
-  overflow: hidden;
-  text-overflow: ellipsis;
-}
-
-.sort-bar {
-  display: flex;
-  justify-content: flex-end;
-  margin-bottom: 12px;
-}
-
-.sort-dropdown {
-  display: inline-flex;
-  align-items: center;
-  gap: 8px;
-  position: relative;
-}
-
-.sort-dropdown-label {
-  color: var(--muted);
-  font-size: 0.84rem;
-}
-
-.sort-dropdown-trigger {
-  display: inline-flex;
-  align-items: center;
-  justify-content: space-between;
-  gap: 14px;
-  min-width: 152px;
-  padding: 7px 10px;
-  border: 1px solid rgba(148, 163, 184, 0.26);
-  border-radius: 10px;
-  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(241, 245, 249, 0.92));
-  color: var(--text);
-  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
-  cursor: pointer;
-  transition:
-    border-color 160ms ease,
-    box-shadow 160ms ease,
-    background 160ms ease;
-}
-
-.sort-dropdown-trigger:hover {
-  border-color: rgba(100, 116, 139, 0.36);
-}
-
-.sort-dropdown-trigger.open {
-  border-color: rgba(47, 111, 237, 0.42);
-  box-shadow:
-    0 0 0 3px rgba(47, 111, 237, 0.12),
-    inset 0 1px 0 rgba(255, 255, 255, 0.8);
-}
-
-.sort-dropdown-caret {
-  width: 10px;
-  height: 10px;
-  flex-shrink: 0;
-  border-right: 1.8px solid #64748b;
-  border-bottom: 1.8px solid #64748b;
-  transform: rotate(45deg) translateY(-1px);
-  transition: transform 160ms ease;
-}
-
-.sort-dropdown-trigger.open .sort-dropdown-caret {
-  transform: rotate(-135deg) translate(-2px, -2px);
-}
-
-.sort-dropdown-menu {
-  position: absolute;
-  top: calc(100% + 8px);
-  right: 0;
-  z-index: 30;
-  min-width: 100%;
-  padding: 6px;
-  border: 1px solid rgba(148, 163, 184, 0.22);
-  border-radius: 14px;
-  background: rgba(255, 255, 255, 0.98);
-  box-shadow:
-    0 20px 40px rgba(15, 23, 42, 0.14),
-    inset 0 1px 0 rgba(255, 255, 255, 0.75);
-  backdrop-filter: blur(16px);
-  -webkit-backdrop-filter: blur(16px);
-}
-
-.sort-dropdown-option {
-  display: block;
-  width: 100%;
-  padding: 10px 12px;
-  border-radius: 10px;
-  text-align: left;
-  color: var(--text);
-  background: transparent;
-  cursor: pointer;
-  transition:
-    background 140ms ease,
-    color 140ms ease;
-}
-
-.sort-dropdown-option:hover {
-  background: rgba(241, 245, 249, 0.92);
-}
-
-.sort-dropdown-option.active {
-  color: #fff;
-  background: linear-gradient(135deg, #213f75, #325ca8);
-}
-
-.section-tabs {
-  display: flex;
-  gap: 10px;
-  margin-top: 0;
-  padding: 8px;
-  flex-shrink: 0;
-}
-
-.content-scroll-area {
-  min-height: 0;
-  overflow: auto;
-  padding-right: 2px;
-}
-
-.section-tab {
-  display: inline-flex;
-  align-items: center;
-  justify-content: space-between;
-  gap: 12px;
-  min-width: 0;
-  flex: 1;
-  padding: 10px 12px;
-  border-radius: 15px;
-  color: var(--muted);
-  background: rgba(255, 255, 255, 0.58);
-  cursor: pointer;
-  transition:
-    background 160ms ease,
-    color 160ms ease,
-    transform 160ms ease,
-    box-shadow 160ms ease;
-}
-
-.section-tab:hover {
-  transform: translateY(-1px);
-}
-
-.section-tab.active {
-  color: var(--text);
-  background: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(232, 240, 255, 0.92));
-  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
-}
-
-.count-pill,
-.badge {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  border-radius: 999px;
-  background: var(--accent-soft);
-  color: var(--accent);
-  font-size: 0.82rem;
-  font-weight: 600;
-}
-
-.count-pill {
-  min-width: 44px;
-  padding: 6px 10px;
-}
-
-.badge {
-  padding: 6px 10px;
-}
-
-.badge.neutral {
-  background: var(--badge-bg);
-  color: var(--badge-text);
-}
-
-.stack-list,
-.bookmark-list {
-  display: flex;
-  flex-direction: column;
-  gap: 10px;
-}
-
-.profile-card,
-.extension-card,
-.bookmark-card,
-.empty-card {
-  border-radius: 18px;
-  padding: 14px;
-  border: 1px solid rgba(148, 163, 184, 0.18);
-  background: var(--panel-strong);
-}
-
-.profile-card,
-.extension-card,
-.bookmark-card {
-  display: flex;
-  gap: 12px;
-}
-
-.profile-avatar {
-  width: 52px;
-  height: 52px;
-  border-radius: 15px;
-  background: linear-gradient(135deg, #dbeafe, #eff6ff);
-  color: #1d4ed8;
-  font-size: 1.1rem;
-  font-weight: 700;
-}
-
-.profile-avatar img,
-.extension-icon img {
-  width: 100%;
-  height: 100%;
-  object-fit: cover;
-}
-
-.profile-body,
-.extension-body,
-.bookmark-body {
-  min-width: 0;
-  flex: 1;
-}
-
-.profile-topline,
-.extension-topline,
-.bookmark-topline {
-  display: flex;
-  align-items: flex-start;
-  justify-content: space-between;
-  gap: 12px;
-}
-
-.profile-topline h4,
-.extension-topline h4,
-.bookmark-topline h4 {
-  font-size: 0.96rem;
-  line-height: 1.35;
-}
-
-.profile-actions {
-  display: inline-flex;
-  align-items: center;
-  gap: 8px;
-}
-
-.profile-email,
-.meta-line,
-.bookmark-url {
-  margin-top: 6px;
-  font-size: 0.87rem;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-}
-
-.extension-icon {
-  width: 46px;
-  height: 46px;
-  border-radius: 14px;
-  background: linear-gradient(135deg, #e2e8f0, #f8fafc);
-  color: #475569;
-  font-weight: 700;
-}
-
-.source-disclosure {
-  margin-top: 10px;
-}
-
-.disclosure-button {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  gap: 10px;
-  width: fit-content;
-  min-width: 120px;
-  padding: 7px 10px;
-  border-radius: 12px;
-  background: rgba(241, 245, 249, 0.9);
-  color: var(--badge-text);
-  cursor: pointer;
-}
-
-.card-action-button {
-  padding: 6px 10px;
-  border-radius: 10px;
-  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(241, 245, 249, 0.92));
-  border: 1px solid rgba(148, 163, 184, 0.24);
-  color: var(--text);
-  font-size: 0.8rem;
-  font-weight: 600;
-  cursor: pointer;
-  transition:
-    border-color 160ms ease,
-    background 160ms ease,
-    box-shadow 160ms ease;
-}
-
-.card-action-button:hover {
-  border-color: rgba(100, 116, 139, 0.36);
-  background: linear-gradient(180deg, rgba(255, 255, 255, 1), rgba(226, 232, 240, 0.9));
-}
-
-.card-action-button:disabled {
-  cursor: default;
-  opacity: 0.7;
-  border-color: rgba(148, 163, 184, 0.2);
-}
-
-.card-action-button:active {
-  box-shadow: inset 0 2px 4px rgba(148, 163, 184, 0.18);
-}
-
-.disclosure-panel {
-  display: flex;
-  flex-wrap: wrap;
-  gap: 8px;
-  margin-top: 8px;
-}
-
-.state-panel,
-.empty-card {
-  display: grid;
-  gap: 8px;
-}
-
-.eyebrow {
-  margin: 0 0 6px;
-  color: var(--muted-soft);
-  font-size: 0.72rem;
-  font-weight: 600;
-  letter-spacing: 0.18em;
-  text-transform: uppercase;
-}
-
-.state-panel {
-  min-height: 320px;
-  place-content: center;
-  padding: 28px;
-}
-
-.sidebar-refresh {
-  margin-top: 10px;
-  align-self: stretch;
-}
-
-.browser-nav,
-.content-scroll-area {
-  scrollbar-width: thin;
-  scrollbar-color: rgba(100, 116, 139, 0.42) transparent;
-}
-
-.browser-nav::-webkit-scrollbar,
-.content-scroll-area::-webkit-scrollbar {
-  width: 10px;
-}
-
-.browser-nav::-webkit-scrollbar-track,
-.content-scroll-area::-webkit-scrollbar-track {
-  background: transparent;
-}
-
-.browser-nav::-webkit-scrollbar-thumb,
-.content-scroll-area::-webkit-scrollbar-thumb {
-  border: 3px solid transparent;
-  border-radius: 999px;
-  background: linear-gradient(180deg, rgba(148, 163, 184, 0.72), rgba(100, 116, 139, 0.58));
-  background-clip: padding-box;
-}
-
-.browser-nav::-webkit-scrollbar-thumb:hover,
-.content-scroll-area::-webkit-scrollbar-thumb:hover {
-  background: linear-gradient(180deg, rgba(100, 116, 139, 0.82), rgba(71, 85, 105, 0.72));
-  background-clip: padding-box;
-}
-
-.state-panel.error {
-  background: linear-gradient(180deg, rgba(254, 242, 242, 0.92), rgba(255, 255, 255, 0.86));
-}
-
-@media (max-width: 1180px) {
-  .app-shell {
-    grid-template-columns: 1fr;
-    height: auto;
-    min-height: 100vh;
-    padding: 12px;
-    overflow: visible;
-  }
-
-  .content-panel {
-    padding: 0;
-    overflow: visible;
-  }
-
-  .browser-nav,
-  .content-scroll-area {
-    overflow: visible;
-  }
-}
-
-@media (max-width: 720px) {
-  .config-form-layout {
-    grid-template-columns: 1fr;
-  }
-
-  .icon-option-grid {
-    grid-template-columns: repeat(3, minmax(0, 1fr));
-  }
-
-  .sort-bar {
-    justify-content: stretch;
-  }
-
-  .sort-dropdown {
-    width: 100%;
-  }
-
-  .sort-dropdown-trigger {
-    min-width: 0;
-    width: 100%;
-  }
-
-  .profile-card,
-  .extension-card,
-  .bookmark-card {
-    flex-direction: column;
-  }
-
-  .config-meta {
-    grid-template-columns: 1fr;
-  }
-
-  .profile-avatar,
-  .extension-icon {
-    width: 50px;
-    height: 50px;
-  }
-}
+@import "./styles/base.css";
+@import "./styles/app.css";
diff --git a/src/styles/app.css b/src/styles/app.css
new file mode 100644
index 0000000..1fe5f6e
--- /dev/null
+++ b/src/styles/app.css
@@ -0,0 +1,887 @@
+.app-shell {
+  display: grid;
+  grid-template-columns: 320px minmax(0, 1fr);
+  height: 100vh;
+  padding: 14px;
+  gap: 14px;
+  overflow: hidden;
+}
+
+.sidebar,
+.content-panel {
+  backdrop-filter: blur(20px);
+  -webkit-backdrop-filter: blur(20px);
+}
+
+.sidebar {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  padding: 20px 16px;
+  min-height: 0;
+  border: 1px solid var(--panel-border);
+  border-radius: 22px;
+  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(248, 250, 252, 0.7));
+  box-shadow: var(--shadow);
+}
+
+.sidebar-toolbar h1,
+.state-panel h2,
+.profile-topline h4,
+.extension-topline h4,
+.bookmark-topline h4 {
+  margin: 0;
+  font-weight: 600;
+  letter-spacing: -0.03em;
+}
+
+.sidebar-toolbar {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 12px;
+  padding: 2px 2px 8px;
+}
+
+.sidebar-title-group {
+  min-width: 0;
+}
+
+.sidebar-toolbar h1 {
+  font-size: 1.52rem;
+  line-height: 1.02;
+  letter-spacing: -0.04em;
+}
+
+.sidebar-title-group p {
+  margin: 6px 0 0;
+  color: var(--muted);
+  font-size: 0.84rem;
+  line-height: 1.35;
+}
+
+.state-panel p,
+.meta-line,
+.profile-email,
+.bookmark-url,
+.browser-nav-body span,
+.sidebar-empty p {
+  margin: 0;
+  color: var(--muted);
+}
+
+.refresh-button {
+  flex-shrink: 0;
+  margin-top: 2px;
+  padding: 9px 13px;
+  border-radius: 12px;
+  background: linear-gradient(135deg, #10213f 0%, #213f75 100%);
+  color: #fff;
+  cursor: pointer;
+  font-size: 0.86rem;
+  font-weight: 600;
+  transition:
+    transform 160ms ease,
+    box-shadow 160ms ease;
+  box-shadow: 0 12px 24px rgba(20, 44, 82, 0.18);
+}
+
+.refresh-button:hover {
+  transform: translateY(-1px);
+}
+
+.browser-nav {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+  min-height: 0;
+  overflow: auto;
+  padding-right: 2px;
+}
+
+.browser-nav-item {
+  display: flex;
+  align-items: center;
+  gap: 14px;
+  width: 100%;
+  padding: 11px;
+  border-radius: 16px;
+  text-align: left;
+  cursor: pointer;
+  background: rgba(255, 255, 255, 0.54);
+  border: 1px solid transparent;
+  transition:
+    transform 160ms ease,
+    border-color 160ms ease,
+    background 160ms ease;
+}
+
+.browser-nav-item:hover {
+  transform: translateY(-1px);
+  border-color: var(--panel-border);
+}
+
+.browser-nav-item.active {
+  background: var(--accent-soft);
+  border-color: rgba(47, 111, 237, 0.18);
+}
+
+.browser-nav-item.chrome.active {
+  background: rgba(37, 99, 235, 0.12);
+}
+
+.browser-nav-item.edge.active {
+  background: rgba(8, 145, 178, 0.12);
+}
+
+.browser-nav-item.brave.active {
+  background: rgba(234, 88, 12, 0.12);
+}
+
+.browser-nav-item.utility.active {
+  background: rgba(15, 23, 42, 0.08);
+  border-color: rgba(15, 23, 42, 0.1);
+}
+
+.browser-nav-icon,
+.profile-avatar,
+.extension-icon {
+  display: grid;
+  place-items: center;
+  flex-shrink: 0;
+  overflow: hidden;
+}
+
+.browser-nav-icon {
+  width: 42px;
+  height: 42px;
+  border-radius: 0;
+  color: #fff;
+  font-weight: 700;
+  font-size: 0.86rem;
+  letter-spacing: 0.08em;
+  background: transparent;
+  overflow: visible;
+}
+
+.browser-nav-icon img,
+.config-icon img {
+  display: block;
+  width: auto;
+  height: auto;
+  object-fit: contain;
+}
+
+.browser-nav-icon img {
+  max-width: 38px;
+  max-height: 38px;
+}
+
+.config-icon img {
+  max-width: 26px;
+  max-height: 26px;
+}
+
+.config-nav-icon {
+  background: transparent;
+}
+
+.sidebar-utility-nav {
+  margin-top: auto;
+}
+
+.browser-nav-body {
+  min-width: 0;
+}
+
+.browser-nav-body strong {
+  display: block;
+  color: var(--text);
+}
+
+.browser-nav-body span {
+  display: block;
+  margin-top: 2px;
+  font-size: 0.8rem;
+  line-height: 1.4;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.sidebar-empty {
+  padding: 14px;
+  border-radius: 14px;
+  background: rgba(255, 255, 255, 0.58);
+  border: 1px dashed rgba(148, 163, 184, 0.35);
+}
+
+.content-panel {
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+  min-height: 0;
+  padding: 4px 0;
+  overflow: hidden;
+}
+
+.section-tabs,
+.content-section,
+.state-panel {
+  border: 1px solid var(--panel-border);
+  border-radius: 22px;
+  background: var(--panel);
+  box-shadow: var(--shadow);
+}
+
+.content-section {
+  padding: 16px;
+}
+
+.inline-error {
+  margin-bottom: 12px;
+  padding: 10px 12px;
+  border: 1px solid rgba(239, 68, 68, 0.18);
+  border-radius: 12px;
+  background: rgba(254, 242, 242, 0.92);
+  color: #b42318;
+  font-size: 0.86rem;
+}
+
+.config-form-card,
+.config-card {
+  border-radius: 18px;
+  padding: 12px;
+  border: 1px solid rgba(148, 163, 184, 0.18);
+  background: var(--panel-strong);
+}
+
+.config-form-header h3,
+.config-title-row h4 {
+  margin: 0;
+  font-size: 0.94rem;
+}
+
+.config-form-header p,
+.config-meta-row p {
+  margin: 6px 0 0;
+  color: var(--muted);
+  font-size: 0.82rem;
+}
+
+.config-form-layout {
+  display: grid;
+  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.95fr);
+  gap: 14px;
+  margin-top: 12px;
+}
+
+.config-form-fields,
+.config-form-side {
+  display: grid;
+  gap: 10px;
+}
+
+.config-form-side {
+  align-content: start;
+  padding: 10px 12px;
+  border-radius: 16px;
+  background: linear-gradient(180deg, rgba(248, 250, 252, 0.95), rgba(241, 245, 249, 0.8));
+  border: 1px solid rgba(148, 163, 184, 0.14);
+}
+
+.icon-option-grid {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 8px;
+}
+
+.icon-option-button {
+  display: grid;
+  grid-template-columns: 24px minmax(0, 1fr);
+  align-items: center;
+  column-gap: 8px;
+  min-height: 0;
+  padding: 8px 10px;
+  border: 1px solid rgba(148, 163, 184, 0.2);
+  border-radius: 12px;
+  background: rgba(255, 255, 255, 0.9);
+  color: var(--text);
+  cursor: pointer;
+  transition:
+    border-color 160ms ease,
+    background 160ms ease,
+    box-shadow 160ms ease;
+}
+
+.icon-option-button img {
+  width: 22px;
+  height: 22px;
+  object-fit: contain;
+}
+
+.icon-option-button span {
+  font-size: 0.75rem;
+  font-weight: 600;
+  text-align: left;
+  line-height: 1.2;
+}
+
+.icon-option-button.active {
+  border-color: rgba(47, 111, 237, 0.3);
+  background: rgba(232, 240, 255, 0.8);
+  box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.1);
+}
+
+.field-group {
+  display: grid;
+  gap: 6px;
+}
+
+.path-input-row {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
+  gap: 10px;
+}
+
+.field-group span,
+.config-label {
+  color: var(--muted);
+  font-size: 0.8rem;
+  font-weight: 600;
+}
+
+.field-group input {
+  width: 100%;
+  padding: 9px 11px;
+  border: 1px solid rgba(148, 163, 184, 0.24);
+  border-radius: 12px;
+  background: rgba(255, 255, 255, 0.94);
+  color: var(--text);
+  outline: none;
+}
+
+.field-group input:focus {
+  border-color: rgba(47, 111, 237, 0.42);
+  box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.12);
+}
+
+.config-form-actions {
+  display: flex;
+  justify-content: flex-end;
+  margin-top: 2px;
+}
+
+.primary-button,
+.secondary-button,
+.danger-button {
+  padding: 9px 14px;
+  border-radius: 12px;
+  font-size: 0.84rem;
+  font-weight: 600;
+  cursor: pointer;
+}
+
+.primary-button {
+  background: linear-gradient(135deg, #10213f 0%, #213f75 100%);
+  color: #fff;
+}
+
+.secondary-button {
+  border: 1px solid rgba(148, 163, 184, 0.24);
+  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(241, 245, 249, 0.92));
+  color: var(--text);
+}
+
+.danger-button {
+  border: 1px solid rgba(239, 68, 68, 0.18);
+  background: rgba(254, 242, 242, 0.96);
+  color: #b42318;
+}
+
+.primary-button:disabled,
+.secondary-button:disabled,
+.danger-button:disabled {
+  cursor: default;
+  opacity: 0.72;
+}
+
+.config-card-header,
+.config-title-row {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 10px;
+}
+
+.config-card-lead {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  min-width: 0;
+  flex: 1;
+}
+
+.config-icon {
+  width: 30px;
+  height: 30px;
+  border-radius: 0;
+  font-size: 0.74rem;
+  overflow: visible;
+}
+
+.config-meta {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 12px;
+  margin-top: 10px;
+}
+
+.config-meta-row {
+  display: grid;
+  gap: 3px;
+  padding: 10px 12px;
+  border-radius: 12px;
+  background: rgba(248, 250, 252, 0.78);
+  border: 1px solid rgba(148, 163, 184, 0.12);
+}
+
+.config-meta-row p {
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.sort-bar {
+  display: flex;
+  justify-content: flex-end;
+  margin-bottom: 12px;
+}
+
+.sort-dropdown {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  position: relative;
+}
+
+.sort-dropdown-label {
+  color: var(--muted);
+  font-size: 0.84rem;
+}
+
+.sort-dropdown-trigger {
+  display: inline-flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 14px;
+  min-width: 152px;
+  padding: 7px 10px;
+  border: 1px solid rgba(148, 163, 184, 0.26);
+  border-radius: 10px;
+  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(241, 245, 249, 0.92));
+  color: var(--text);
+  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
+  cursor: pointer;
+  transition:
+    border-color 160ms ease,
+    box-shadow 160ms ease,
+    background 160ms ease;
+}
+
+.sort-dropdown-trigger:hover {
+  border-color: rgba(100, 116, 139, 0.36);
+}
+
+.sort-dropdown-trigger.open {
+  border-color: rgba(47, 111, 237, 0.42);
+  box-shadow:
+    0 0 0 3px rgba(47, 111, 237, 0.12),
+    inset 0 1px 0 rgba(255, 255, 255, 0.8);
+}
+
+.sort-dropdown-caret {
+  width: 10px;
+  height: 10px;
+  flex-shrink: 0;
+  border-right: 1.8px solid #64748b;
+  border-bottom: 1.8px solid #64748b;
+  transform: rotate(45deg) translateY(-1px);
+  transition: transform 160ms ease;
+}
+
+.sort-dropdown-trigger.open .sort-dropdown-caret {
+  transform: rotate(-135deg) translate(-2px, -2px);
+}
+
+.sort-dropdown-menu {
+  position: absolute;
+  top: calc(100% + 8px);
+  right: 0;
+  z-index: 30;
+  min-width: 100%;
+  padding: 6px;
+  border: 1px solid rgba(148, 163, 184, 0.22);
+  border-radius: 14px;
+  background: rgba(255, 255, 255, 0.98);
+  box-shadow:
+    0 20px 40px rgba(15, 23, 42, 0.14),
+    inset 0 1px 0 rgba(255, 255, 255, 0.75);
+  backdrop-filter: blur(16px);
+  -webkit-backdrop-filter: blur(16px);
+}
+
+.sort-dropdown-option {
+  display: block;
+  width: 100%;
+  padding: 10px 12px;
+  border-radius: 10px;
+  text-align: left;
+  color: var(--text);
+  background: transparent;
+  cursor: pointer;
+  transition:
+    background 140ms ease,
+    color 140ms ease;
+}
+
+.sort-dropdown-option:hover {
+  background: rgba(241, 245, 249, 0.92);
+}
+
+.sort-dropdown-option.active {
+  color: #fff;
+  background: linear-gradient(135deg, #213f75, #325ca8);
+}
+
+.section-tabs {
+  display: flex;
+  gap: 10px;
+  margin-top: 0;
+  padding: 8px;
+  flex-shrink: 0;
+}
+
+.content-scroll-area {
+  min-height: 0;
+  overflow: auto;
+  padding-right: 2px;
+}
+
+.section-tab {
+  display: inline-flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  min-width: 0;
+  flex: 1;
+  padding: 10px 12px;
+  border-radius: 15px;
+  color: var(--muted);
+  background: rgba(255, 255, 255, 0.58);
+  cursor: pointer;
+  transition:
+    background 160ms ease,
+    color 160ms ease,
+    transform 160ms ease,
+    box-shadow 160ms ease;
+}
+
+.section-tab:hover {
+  transform: translateY(-1px);
+}
+
+.section-tab.active {
+  color: var(--text);
+  background: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(232, 240, 255, 0.92));
+  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
+}
+
+.count-pill,
+.badge {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 999px;
+  background: var(--accent-soft);
+  color: var(--accent);
+  font-size: 0.82rem;
+  font-weight: 600;
+}
+
+.count-pill {
+  min-width: 44px;
+  padding: 6px 10px;
+}
+
+.badge {
+  padding: 6px 10px;
+}
+
+.badge.neutral {
+  background: var(--badge-bg);
+  color: var(--badge-text);
+}
+
+.stack-list,
+.bookmark-list {
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+}
+
+.profile-card,
+.extension-card,
+.bookmark-card,
+.empty-card {
+  border-radius: 18px;
+  padding: 14px;
+  border: 1px solid rgba(148, 163, 184, 0.18);
+  background: var(--panel-strong);
+}
+
+.profile-card,
+.extension-card,
+.bookmark-card {
+  display: flex;
+  gap: 12px;
+}
+
+.profile-avatar {
+  width: 52px;
+  height: 52px;
+  border-radius: 15px;
+  background: linear-gradient(135deg, #dbeafe, #eff6ff);
+  color: #1d4ed8;
+  font-size: 1.1rem;
+  font-weight: 700;
+}
+
+.profile-avatar img,
+.extension-icon img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+}
+
+.profile-body,
+.extension-body,
+.bookmark-body {
+  min-width: 0;
+  flex: 1;
+}
+
+.profile-topline,
+.extension-topline,
+.bookmark-topline {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 12px;
+}
+
+.profile-topline h4,
+.extension-topline h4,
+.bookmark-topline h4 {
+  font-size: 0.96rem;
+  line-height: 1.35;
+}
+
+.profile-actions {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.profile-email,
+.meta-line,
+.bookmark-url {
+  margin-top: 6px;
+  font-size: 0.87rem;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.extension-icon {
+  width: 46px;
+  height: 46px;
+  border-radius: 14px;
+  background: linear-gradient(135deg, #e2e8f0, #f8fafc);
+  color: #475569;
+  font-weight: 700;
+}
+
+.source-disclosure {
+  margin-top: 10px;
+}
+
+.disclosure-button {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 10px;
+  width: fit-content;
+  min-width: 120px;
+  padding: 7px 10px;
+  border-radius: 12px;
+  background: rgba(241, 245, 249, 0.9);
+  color: var(--badge-text);
+  cursor: pointer;
+}
+
+.card-action-button {
+  padding: 6px 10px;
+  border-radius: 10px;
+  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(241, 245, 249, 0.92));
+  border: 1px solid rgba(148, 163, 184, 0.24);
+  color: var(--text);
+  font-size: 0.8rem;
+  font-weight: 600;
+  cursor: pointer;
+  transition:
+    border-color 160ms ease,
+    background 160ms ease,
+    box-shadow 160ms ease;
+}
+
+.card-action-button:hover {
+  border-color: rgba(100, 116, 139, 0.36);
+  background: linear-gradient(180deg, rgba(255, 255, 255, 1), rgba(226, 232, 240, 0.9));
+}
+
+.card-action-button:disabled {
+  cursor: default;
+  opacity: 0.7;
+  border-color: rgba(148, 163, 184, 0.2);
+}
+
+.card-action-button:active {
+  box-shadow: inset 0 2px 4px rgba(148, 163, 184, 0.18);
+}
+
+.disclosure-panel {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px;
+  margin-top: 8px;
+}
+
+.state-panel,
+.empty-card {
+  display: grid;
+  gap: 8px;
+}
+
+.eyebrow {
+  margin: 0 0 6px;
+  color: var(--muted-soft);
+  font-size: 0.72rem;
+  font-weight: 600;
+  letter-spacing: 0.18em;
+  text-transform: uppercase;
+}
+
+.state-panel {
+  min-height: 320px;
+  place-content: center;
+  padding: 28px;
+}
+
+.sidebar-refresh {
+  margin-top: 10px;
+  align-self: stretch;
+}
+
+.browser-nav,
+.content-scroll-area {
+  scrollbar-width: thin;
+  scrollbar-color: rgba(100, 116, 139, 0.42) transparent;
+}
+
+.browser-nav::-webkit-scrollbar,
+.content-scroll-area::-webkit-scrollbar {
+  width: 10px;
+}
+
+.browser-nav::-webkit-scrollbar-track,
+.content-scroll-area::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.browser-nav::-webkit-scrollbar-thumb,
+.content-scroll-area::-webkit-scrollbar-thumb {
+  border: 3px solid transparent;
+  border-radius: 999px;
+  background: linear-gradient(180deg, rgba(148, 163, 184, 0.72), rgba(100, 116, 139, 0.58));
+  background-clip: padding-box;
+}
+
+.browser-nav::-webkit-scrollbar-thumb:hover,
+.content-scroll-area::-webkit-scrollbar-thumb:hover {
+  background: linear-gradient(180deg, rgba(100, 116, 139, 0.82), rgba(71, 85, 105, 0.72));
+  background-clip: padding-box;
+}
+
+.state-panel.error {
+  background: linear-gradient(180deg, rgba(254, 242, 242, 0.92), rgba(255, 255, 255, 0.86));
+}
+
+@media (max-width: 1180px) {
+  .app-shell {
+    grid-template-columns: 1fr;
+    height: auto;
+    min-height: 100vh;
+    padding: 12px;
+    overflow: visible;
+  }
+
+  .content-panel {
+    padding: 0;
+    overflow: visible;
+  }
+
+  .browser-nav,
+  .content-scroll-area {
+    overflow: visible;
+  }
+}
+
+@media (max-width: 720px) {
+  .config-form-layout {
+    grid-template-columns: 1fr;
+  }
+
+  .icon-option-grid {
+    grid-template-columns: repeat(3, minmax(0, 1fr));
+  }
+
+  .sort-bar {
+    justify-content: stretch;
+  }
+
+  .sort-dropdown {
+    width: 100%;
+  }
+
+  .sort-dropdown-trigger {
+    min-width: 0;
+    width: 100%;
+  }
+
+  .profile-card,
+  .extension-card,
+  .bookmark-card {
+    flex-direction: column;
+  }
+
+  .config-meta {
+    grid-template-columns: 1fr;
+  }
+
+  .profile-avatar,
+  .extension-icon {
+    width: 50px;
+    height: 50px;
+  }
+}
diff --git a/src/styles/base.css b/src/styles/base.css
new file mode 100644
index 0000000..d43c7bb
--- /dev/null
+++ b/src/styles/base.css
@@ -0,0 +1,58 @@
+:root {
+  color: #15202b;
+  background:
+    radial-gradient(circle at top left, rgba(108, 145, 255, 0.16), transparent 32%),
+    radial-gradient(circle at top right, rgba(16, 185, 129, 0.14), transparent 24%),
+    linear-gradient(180deg, #f5f8fc 0%, #edf2f7 100%);
+  font-family:
+    "Segoe UI Variable Text",
+    "Segoe UI",
+    "PingFang SC",
+    "Microsoft YaHei UI",
+    sans-serif;
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+  --panel: rgba(255, 255, 255, 0.76);
+  --panel-strong: rgba(255, 255, 255, 0.94);
+  --panel-border: rgba(148, 163, 184, 0.18);
+  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
+  --text: #0f172a;
+  --muted: #526277;
+  --muted-soft: #7b8aa2;
+  --badge-bg: rgba(226, 232, 240, 0.7);
+  --badge-text: #344256;
+  --accent: #2f6fed;
+  --accent-soft: rgba(47, 111, 237, 0.12);
+  --chrome: #2563eb;
+  --edge: #0891b2;
+  --brave: #ea580c;
+}
+
+* {
+  box-sizing: border-box;
+}
+
+html,
+body,
+#app {
+  margin: 0;
+  min-height: 100%;
+}
+
+body {
+  min-height: 100vh;
+  color: var(--text);
+}
+
+button,
+input,
+textarea,
+select {
+  font: inherit;
+}
+
+button {
+  border: 0;
+}
diff --git a/src/features/browser-assistant/types.ts b/src/types/browser.ts
similarity index 100%
rename from src/features/browser-assistant/types.ts
rename to src/types/browser.ts
diff --git a/src/features/browser-assistant/icons.ts b/src/utils/icons.ts
similarity index 66%
rename from src/features/browser-assistant/icons.ts
rename to src/utils/icons.ts
index 9fdf19a..23233e6 100644
--- a/src/features/browser-assistant/icons.ts
+++ b/src/utils/icons.ts
@@ -1,7 +1,7 @@
-import braveIcon from "../../assets/brave.png";
-import chromeIcon from "../../assets/google-chrome.png";
-import edgeIcon from "../../assets/microsoft-edge.png";
-import settingsIcon from "../../assets/settings.png";
+import braveIcon from "../assets/brave.png";
+import chromeIcon from "../assets/google-chrome.png";
+import edgeIcon from "../assets/microsoft-edge.png";
+import settingsIcon from "../assets/settings.png";
 
 export const browserIconOptions = [
   { key: "chrome", label: "Google Chrome", src: chromeIcon },
diff --git a/src/features/browser-assistant/sort.ts b/src/utils/sort.ts
similarity index 99%
rename from src/features/browser-assistant/sort.ts
rename to src/utils/sort.ts
index cdb3eed..7180eb0 100644
--- a/src/features/browser-assistant/sort.ts
+++ b/src/utils/sort.ts
@@ -5,7 +5,7 @@ import type {
   ExtensionSummary,
   ProfileSortKey,
   ProfileSummary,
-} from "./types";
+} from "../types/browser";
 
 export function compareText(left: string, right: string) {
   return left.localeCompare(right, undefined, {