diff --git a/src/lib/components/duplicate-workspace-dialog.svelte b/src/lib/components/duplicate-workspace-dialog.svelte
new file mode 100644
index 0000000..3005f34
--- /dev/null
+++ b/src/lib/components/duplicate-workspace-dialog.svelte
@@ -0,0 +1,338 @@
+<script lang="ts">
+  import * as Dialog from "$lib/components/ui/dialog/index.js";
+  import { Button } from "$lib/components/ui/button/index.js";
+  import { Input } from "$lib/components/ui/input/index.js";
+  import { Label } from "$lib/components/ui/label/index.js";
+  import { Textarea } from "$lib/components/ui/textarea/index.js";
+  import { Badge } from "$lib/components/ui/badge/index.js";
+  import { Separator } from "$lib/components/ui/separator/index.js";
+  import CopyIcon from "@lucide/svelte/icons/copy";
+  import LinkIcon from "@lucide/svelte/icons/link";
+  import type { Workspace } from "$lib/types/workspace";
+  import type { Variable } from "$lib/types/variable";
+  import { get_workspace_variables } from "$lib/services/variables";
+  import {
+    duplicate_workspace,
+    type DuplicateWorkspaceOptions,
+  } from "$lib/services/sync";
+
+  type Props = {
+    open: boolean;
+    onOpenChange: (open: boolean) => void;
+    sourceWorkspace: Workspace | null;
+    onDuplicate: (options: DuplicateWorkspaceOptions) => Promise<void>;
+  };
+
+  let {
+    open = $bindable(),
+    onOpenChange,
+    sourceWorkspace,
+    onDuplicate,
+  }: Props = $props();
+
+  let newName = $state("");
+  let newDescription = $state("");
+  let environment = $state("");
+  let copyVariables = $state(true);
+  let copySecrets = $state(false);
+  let createSyncGroup = $state(false);
+  let syncGroupName = $state("");
+  let variablesToSync = $state<string[]>([]);
+
+  let workspaceVariables = $state<Variable[]>([]);
+  let loading = $state(false);
+
+  $effect(() => {
+    if (open && sourceWorkspace) {
+      newName = `${sourceWorkspace.Name} (Copy)`;
+      newDescription = sourceWorkspace.Description;
+      environment = "";
+      syncGroupName = `${sourceWorkspace.Name} Environments`;
+      loadVariables();
+    }
+  });
+
+  async function loadVariables() {
+    if (sourceWorkspace) {
+      workspaceVariables = await get_workspace_variables(sourceWorkspace.Id);
+    }
+  }
+
+  function toggleVariableSync(varName: string) {
+    if (variablesToSync.includes(varName)) {
+      variablesToSync = variablesToSync.filter((v) => v !== varName);
+    } else {
+      variablesToSync = [...variablesToSync, varName];
+    }
+  }
+
+  function selectAllVariables() {
+    variablesToSync = workspaceVariables
+      .filter((v) => !v.isSecret || copySecrets)
+      .map((v) => v.name);
+  }
+
+  function deselectAllVariables() {
+    variablesToSync = [];
+  }
+
+  async function handleSubmit() {
+    if (!sourceWorkspace) return;
+
+    loading = true;
+    try {
+      await onDuplicate({
+        sourceWorkspaceId: sourceWorkspace.Id,
+        newName,
+        newDescription,
+        environment: environment || undefined,
+        copyVariables,
+        copySecrets,
+        createSyncGroup,
+        syncGroupName: createSyncGroup ? syncGroupName : undefined,
+        variablesToSync: createSyncGroup ? variablesToSync : undefined,
+      });
+      onOpenChange(false);
+    } finally {
+      loading = false;
+    }
+  }
+</script>
+
+<Dialog.Root bind:open {onOpenChange}>
+  <Dialog.Content
+    class="sm:max-w-[550px] max-h-[85vh] overflow-hidden flex flex-col"
+  >
+    <Dialog.Header>
+      <Dialog.Title class="flex items-center gap-2">
+        <CopyIcon class="size-5" />
+        Duplicate Workspace
+      </Dialog.Title>
+      <Dialog.Description>
+        Create a copy of "{sourceWorkspace?.Name}" with all its collections and
+        requests.
+      </Dialog.Description>
+    </Dialog.Header>
+
+    <form
+      class="flex-1 overflow-auto space-y-4 py-4"
+      onsubmit={(e) => {
+        e.preventDefault();
+        handleSubmit();
+      }}
+    >
+      <div class="space-y-4">
+        <div class="grid grid-cols-4 items-center gap-4">
+          <Label for="new-name" class="text-end">Name</Label>
+          <Input
+            id="new-name"
+            class="col-span-3"
+            placeholder="New workspace name"
+            bind:value={newName}
+          />
+        </div>
+
+        <div class="grid grid-cols-4 items-center gap-4">
+          <Label for="new-desc" class="text-end">Description</Label>
+          <Textarea
+            id="new-desc"
+            class="col-span-3"
+            placeholder="Workspace description"
+            bind:value={newDescription}
+            rows={2}
+          />
+        </div>
+
+        <div class="grid grid-cols-4 items-center gap-4">
+          <Label for="environment" class="text-end">Environment</Label>
+          <Input
+            id="environment"
+            class="col-span-3"
+            placeholder="e.g., Development, Staging, Production"
+            bind:value={environment}
+          />
+        </div>
+      </div>
+
+      <Separator />
+
+      <div class="space-y-4">
+        <h4 class="font-medium">Variables</h4>
+
+        <div class="flex items-center justify-between">
+          <div class="space-y-0.5">
+            <Label>Copy Variables</Label>
+            <p class="text-xs text-muted-foreground">
+              Copy workspace variables to the new workspace.
+            </p>
+          </div>
+          <button
+            type="button"
+            role="switch"
+            aria-checked={copyVariables}
+            aria-label="Toggle copy variables"
+            class="relative inline-flex h-6 w-11 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 {copyVariables
+              ? 'bg-primary'
+              : 'bg-input'}"
+            onclick={() => (copyVariables = !copyVariables)}
+          >
+            <span
+              class="pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform {copyVariables
+                ? 'translate-x-5'
+                : 'translate-x-0'}"
+            ></span>
+          </button>
+        </div>
+
+        {#if copyVariables}
+          <div class="flex items-center justify-between">
+            <div class="space-y-0.5">
+              <Label>Copy Secret Values</Label>
+              <p class="text-xs text-muted-foreground">
+                Copy secret values (otherwise they'll be empty).
+              </p>
+            </div>
+            <button
+              type="button"
+              role="switch"
+              aria-checked={copySecrets}
+              aria-label="Toggle copy secrets"
+              class="relative inline-flex h-6 w-11 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 {copySecrets
+                ? 'bg-primary'
+                : 'bg-input'}"
+              onclick={() => (copySecrets = !copySecrets)}
+            >
+              <span
+                class="pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform {copySecrets
+                  ? 'translate-x-5'
+                  : 'translate-x-0'}"
+              ></span>
+            </button>
+          </div>
+        {/if}
+      </div>
+
+      <Separator />
+
+      <div class="space-y-4">
+        <div class="flex items-center justify-between">
+          <div class="space-y-0.5">
+            <div class="flex items-center gap-2">
+              <LinkIcon class="size-4" />
+              <Label>Create Sync Group</Label>
+            </div>
+            <p class="text-xs text-muted-foreground">
+              Link workspaces to sync selected variables between environments.
+            </p>
+          </div>
+          <button
+            type="button"
+            role="switch"
+            aria-checked={createSyncGroup}
+            aria-label="Toggle create sync group"
+            class="relative inline-flex h-6 w-11 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 {createSyncGroup
+              ? 'bg-primary'
+              : 'bg-input'}"
+            onclick={() => (createSyncGroup = !createSyncGroup)}
+          >
+            <span
+              class="pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform {createSyncGroup
+                ? 'translate-x-5'
+                : 'translate-x-0'}"
+            ></span>
+          </button>
+        </div>
+
+        {#if createSyncGroup}
+          <div class="grid grid-cols-4 items-center gap-4">
+            <Label for="sync-name" class="text-end">Group Name</Label>
+            <Input
+              id="sync-name"
+              class="col-span-3"
+              placeholder="Sync group name"
+              bind:value={syncGroupName}
+            />
+          </div>
+
+          <div class="space-y-2">
+            <div class="flex items-center justify-between">
+              <Label>Variables to Sync</Label>
+              <div class="flex gap-2">
+                <Button
+                  type="button"
+                  variant="ghost"
+                  size="sm"
+                  onclick={selectAllVariables}
+                >
+                  Select All
+                </Button>
+                <Button
+                  type="button"
+                  variant="ghost"
+                  size="sm"
+                  onclick={deselectAllVariables}
+                >
+                  Deselect All
+                </Button>
+              </div>
+            </div>
+            <p class="text-xs text-muted-foreground mb-2">
+              Selected variables will be kept in sync across linked workspaces.
+            </p>
+
+            {#if workspaceVariables.length === 0}
+              <div class="text-center py-4 text-muted-foreground text-sm">
+                No workspace variables to sync.
+              </div>
+            {:else}
+              <div
+                class="grid grid-cols-2 gap-2 max-h-[150px] overflow-auto p-2 border rounded-md"
+              >
+                {#each workspaceVariables as variable (variable.id)}
+                  {#if !variable.isSecret || copySecrets}
+                    <button
+                      type="button"
+                      class="flex items-center gap-2 p-2 rounded text-left text-sm hover:bg-accent transition-colors {variablesToSync.includes(
+                        variable.name
+                      )
+                        ? 'bg-accent'
+                        : ''}"
+                      onclick={() => toggleVariableSync(variable.name)}
+                    >
+                      <input
+                        type="checkbox"
+                        checked={variablesToSync.includes(variable.name)}
+                        class="rounded"
+                        onchange={() => {}}
+                      />
+                      <span class="font-mono text-xs truncate"
+                        >{variable.name}</span
+                      >
+                      {#if variable.isSecret}
+                        <Badge variant="secondary" class="text-xs">secret</Badge
+                        >
+                      {/if}
+                    </button>
+                  {/if}
+                {/each}
+              </div>
+            {/if}
+          </div>
+        {/if}
+      </div>
+
+      <Dialog.Footer class="pt-4">
+        <Button
+          type="button"
+          variant="outline"
+          onclick={() => onOpenChange(false)}
+        >
+          Cancel
+        </Button>
+        <Button type="submit" disabled={loading || !newName.trim()}>
+          {loading ? "Creating..." : "Duplicate Workspace"}
+        </Button>
+      </Dialog.Footer>
+    </form>
+  </Dialog.Content>
+</Dialog.Root>
diff --git a/src/lib/components/settings-dialog.svelte b/src/lib/components/settings-dialog.svelte
new file mode 100644
index 0000000..98ab306
--- /dev/null
+++ b/src/lib/components/settings-dialog.svelte
@@ -0,0 +1,262 @@
+<script lang="ts">
+  import * as Dialog from "$lib/components/ui/dialog/index.js";
+  import * as Tabs from "$lib/components/ui/tabs/index.js";
+  import * as Select from "$lib/components/ui/select/index.js";
+  import { Button } from "$lib/components/ui/button/index.js";
+  import { Input } from "$lib/components/ui/input/index.js";
+  import { Label } from "$lib/components/ui/label/index.js";
+  import { Separator } from "$lib/components/ui/separator/index.js";
+  import SettingsIcon from "@lucide/svelte/icons/settings";
+  import type { AppSettings } from "$lib/types/workspace";
+  import {
+    get_settings,
+    update_settings,
+    reset_settings,
+  } from "$lib/services/settings";
+  import { onMount } from "svelte";
+
+  type Props = {
+    open: boolean;
+    onOpenChange: (open: boolean) => void;
+  };
+
+  let { open = $bindable(), onOpenChange }: Props = $props();
+
+  let settings = $state<AppSettings>({
+    theme: "system",
+    defaultTimeout: 30000,
+    followRedirects: true,
+    validateSSL: true,
+    maxHistoryItems: 100,
+    autoSaveRequests: true,
+  });
+
+  let loading = $state(false);
+
+  onMount(async () => {
+    settings = await get_settings();
+  });
+
+  $effect(() => {
+    if (open) {
+      loadSettings();
+    }
+  });
+
+  async function loadSettings() {
+    settings = await get_settings();
+  }
+
+  async function handleSave() {
+    loading = true;
+    await update_settings(settings);
+    loading = false;
+    onOpenChange(false);
+  }
+
+  async function handleReset() {
+    settings = await reset_settings();
+  }
+
+  function handleThemeChange(value: string) {
+    settings.theme = value as "light" | "dark" | "system";
+  }
+</script>
+
+<Dialog.Root bind:open {onOpenChange}>
+  <Dialog.Content
+    class="sm:max-w-[600px] max-h-[80vh] overflow-hidden flex flex-col"
+  >
+    <Dialog.Header>
+      <Dialog.Title class="flex items-center gap-2">
+        <SettingsIcon class="size-5" />
+        Settings
+      </Dialog.Title>
+      <Dialog.Description>
+        Configure application settings and preferences.
+      </Dialog.Description>
+    </Dialog.Header>
+
+    <Tabs.Root value="general" class="flex-1 overflow-hidden">
+      <Tabs.List class="grid w-full grid-cols-3">
+        <Tabs.Trigger value="general">General</Tabs.Trigger>
+        <Tabs.Trigger value="requests">Requests</Tabs.Trigger>
+        <Tabs.Trigger value="advanced">Advanced</Tabs.Trigger>
+      </Tabs.List>
+
+      <div class="mt-4 overflow-auto max-h-[400px]">
+        <Tabs.Content value="general" class="space-y-4">
+          <div class="space-y-2">
+            <Label for="theme">Theme</Label>
+            <Select.Root
+              type="single"
+              value={settings.theme}
+              onValueChange={handleThemeChange}
+            >
+              <Select.Trigger id="theme" class="w-full">
+                {settings.theme === "light"
+                  ? "Light"
+                  : settings.theme === "dark"
+                    ? "Dark"
+                    : "System"}
+              </Select.Trigger>
+              <Select.Content>
+                <Select.Item value="system">System</Select.Item>
+                <Select.Item value="light">Light</Select.Item>
+                <Select.Item value="dark">Dark</Select.Item>
+              </Select.Content>
+            </Select.Root>
+            <p class="text-xs text-muted-foreground">
+              Choose the application color theme.
+            </p>
+          </div>
+
+          <Separator />
+
+          <div class="space-y-2">
+            <Label for="maxHistory">History Items</Label>
+            <Input
+              id="maxHistory"
+              type="number"
+              min="10"
+              max="1000"
+              bind:value={settings.maxHistoryItems}
+            />
+            <p class="text-xs text-muted-foreground">
+              Maximum number of request history items to keep.
+            </p>
+          </div>
+
+          <div class="flex items-center justify-between">
+            <div class="space-y-0.5">
+              <Label>Auto-save Requests</Label>
+              <p class="text-xs text-muted-foreground">
+                Automatically save request changes.
+              </p>
+            </div>
+            <button
+              type="button"
+              role="switch"
+              aria-checked={settings.autoSaveRequests}
+              aria-label="Toggle auto-save requests"
+              class="relative inline-flex h-6 w-11 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 {settings.autoSaveRequests
+                ? 'bg-primary'
+                : 'bg-input'}"
+              onclick={() =>
+                (settings.autoSaveRequests = !settings.autoSaveRequests)}
+            >
+              <span
+                class="pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform {settings.autoSaveRequests
+                  ? 'translate-x-5'
+                  : 'translate-x-0'}"
+              ></span>
+            </button>
+          </div>
+        </Tabs.Content>
+
+        <Tabs.Content value="requests" class="space-y-4">
+          <div class="space-y-2">
+            <Label for="timeout">Default Timeout (ms)</Label>
+            <Input
+              id="timeout"
+              type="number"
+              min="1000"
+              max="300000"
+              step="1000"
+              bind:value={settings.defaultTimeout}
+            />
+            <p class="text-xs text-muted-foreground">
+              Default timeout for HTTP requests in milliseconds.
+            </p>
+          </div>
+
+          <Separator />
+
+          <div class="flex items-center justify-between">
+            <div class="space-y-0.5">
+              <Label>Follow Redirects</Label>
+              <p class="text-xs text-muted-foreground">
+                Automatically follow HTTP redirects.
+              </p>
+            </div>
+            <button
+              type="button"
+              role="switch"
+              aria-checked={settings.followRedirects}
+              aria-label="Toggle follow redirects"
+              class="relative inline-flex h-6 w-11 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 {settings.followRedirects
+                ? 'bg-primary'
+                : 'bg-input'}"
+              onclick={() =>
+                (settings.followRedirects = !settings.followRedirects)}
+            >
+              <span
+                class="pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform {settings.followRedirects
+                  ? 'translate-x-5'
+                  : 'translate-x-0'}"
+              ></span>
+            </button>
+          </div>
+
+          <div class="flex items-center justify-between">
+            <div class="space-y-0.5">
+              <Label>Validate SSL Certificates</Label>
+              <p class="text-xs text-muted-foreground">
+                Verify SSL/TLS certificates for HTTPS requests.
+              </p>
+            </div>
+            <button
+              type="button"
+              role="switch"
+              aria-checked={settings.validateSSL}
+              aria-label="Toggle SSL validation"
+              class="relative inline-flex h-6 w-11 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 {settings.validateSSL
+                ? 'bg-primary'
+                : 'bg-input'}"
+              onclick={() => (settings.validateSSL = !settings.validateSSL)}
+            >
+              <span
+                class="pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform {settings.validateSSL
+                  ? 'translate-x-5'
+                  : 'translate-x-0'}"
+              ></span>
+            </button>
+          </div>
+        </Tabs.Content>
+
+        <Tabs.Content value="advanced" class="space-y-4">
+          <div class="rounded-lg border p-4 bg-muted/30">
+            <h4 class="font-medium mb-2">Reset Settings</h4>
+            <p class="text-sm text-muted-foreground mb-4">
+              Reset all settings to their default values. This action cannot be
+              undone.
+            </p>
+            <Button variant="destructive" size="sm" onclick={handleReset}>
+              Reset to Defaults
+            </Button>
+          </div>
+
+          <div class="rounded-lg border p-4 bg-muted/30">
+            <h4 class="font-medium mb-2">Data Management</h4>
+            <p class="text-sm text-muted-foreground mb-4">
+              Export or import your workspaces, collections, and settings.
+            </p>
+            <div class="flex gap-2">
+              <Button variant="outline" size="sm" disabled>Export Data</Button>
+              <Button variant="outline" size="sm" disabled>Import Data</Button>
+            </div>
+          </div>
+        </Tabs.Content>
+      </div>
+    </Tabs.Root>
+
+    <Dialog.Footer class="mt-4">
+      <Button variant="outline" onclick={() => onOpenChange(false)}>
+        Cancel
+      </Button>
+      <Button onclick={handleSave} disabled={loading}>
+        {loading ? "Saving..." : "Save Changes"}
+      </Button>
+    </Dialog.Footer>
+  </Dialog.Content>
+</Dialog.Root>
diff --git a/src/lib/components/variables-panel.svelte b/src/lib/components/variables-panel.svelte
new file mode 100644
index 0000000..5714692
--- /dev/null
+++ b/src/lib/components/variables-panel.svelte
@@ -0,0 +1,418 @@
+<script lang="ts">
+  import * as Dialog from "$lib/components/ui/dialog/index.js";
+  import * as Tabs from "$lib/components/ui/tabs/index.js";
+  import * as Select from "$lib/components/ui/select/index.js";
+  import { Button } from "$lib/components/ui/button/index.js";
+  import { Input } from "$lib/components/ui/input/index.js";
+  import { Label } from "$lib/components/ui/label/index.js";
+  import { Badge } from "$lib/components/ui/badge/index.js";
+  import { Textarea } from "$lib/components/ui/textarea/index.js";
+  import PlusIcon from "@lucide/svelte/icons/plus";
+  import TrashIcon from "@lucide/svelte/icons/trash-2";
+  import PencilIcon from "@lucide/svelte/icons/pencil";
+  import LockIcon from "@lucide/svelte/icons/lock";
+  import EyeIcon from "@lucide/svelte/icons/eye";
+  import EyeOffIcon from "@lucide/svelte/icons/eye-off";
+  import VariableIcon from "@lucide/svelte/icons/variable";
+  import type { Variable, VariableScope } from "$lib/types/variable";
+  import {
+    get_global_variables,
+    get_workspace_variables,
+    get_collection_variables,
+    create_variable,
+    update_variable,
+    delete_variable,
+  } from "$lib/services/variables";
+  import { onMount } from "svelte";
+
+  type Props = {
+    open: boolean;
+    onOpenChange: (open: boolean) => void;
+    workspaceId?: string;
+    collectionId?: string;
+  };
+
+  let {
+    open = $bindable(),
+    onOpenChange,
+    workspaceId,
+    collectionId,
+  }: Props = $props();
+
+  let globalVariables = $state<Variable[]>([]);
+  let workspaceVariables = $state<Variable[]>([]);
+  let collectionVariables = $state<Variable[]>([]);
+
+  let editDialogOpen = $state(false);
+  let editingVariable = $state<Variable | null>(null);
+  let isCreating = $state(false);
+
+  let formName = $state("");
+  let formValue = $state("");
+  let formDescription = $state("");
+  let formIsSecret = $state(false);
+  let formScope = $state<VariableScope>("global");
+
+  let showSecretValues = $state<Set<string>>(new Set());
+
+  $effect(() => {
+    if (open) {
+      loadVariables();
+    }
+  });
+
+  async function loadVariables() {
+    globalVariables = await get_global_variables();
+    if (workspaceId) {
+      workspaceVariables = await get_workspace_variables(workspaceId);
+    }
+    if (collectionId) {
+      collectionVariables = await get_collection_variables(collectionId);
+    }
+  }
+
+  function openCreateDialog(scope: VariableScope) {
+    isCreating = true;
+    editingVariable = null;
+    formName = "";
+    formValue = "";
+    formDescription = "";
+    formIsSecret = false;
+    formScope = scope;
+    editDialogOpen = true;
+  }
+
+  function openEditDialog(variable: Variable) {
+    isCreating = false;
+    editingVariable = variable;
+    formName = variable.name;
+    formValue = variable.value;
+    formDescription = variable.description || "";
+    formIsSecret = variable.isSecret;
+    formScope = variable.scope;
+    editDialogOpen = true;
+  }
+
+  async function handleSave() {
+    const scopeId =
+      formScope === "global"
+        ? null
+        : formScope === "workspace"
+          ? (workspaceId ?? null)
+          : formScope === "collection"
+            ? (collectionId ?? null)
+            : null;
+
+    if (isCreating) {
+      await create_variable({
+        name: formName,
+        value: formValue,
+        scope: formScope,
+        scopeId,
+        isSecret: formIsSecret,
+        description: formDescription || undefined,
+      });
+    } else if (editingVariable) {
+      await update_variable(editingVariable.id, {
+        name: formName,
+        value: formValue,
+        isSecret: formIsSecret,
+        description: formDescription || undefined,
+      });
+    }
+
+    await loadVariables();
+    editDialogOpen = false;
+  }
+
+  async function handleDelete(variable: Variable) {
+    await delete_variable(variable.id);
+    await loadVariables();
+  }
+
+  function toggleSecretVisibility(id: string) {
+    if (showSecretValues.has(id)) {
+      showSecretValues.delete(id);
+    } else {
+      showSecretValues.add(id);
+    }
+    showSecretValues = new Set(showSecretValues);
+  }
+
+  function getScopeColor(scope: VariableScope): string {
+    const colors: Record<VariableScope, string> = {
+      global: "bg-purple-500/10 text-purple-500",
+      workspace: "bg-blue-500/10 text-blue-500",
+      collection: "bg-green-500/10 text-green-500",
+      request: "bg-orange-500/10 text-orange-500",
+    };
+    return colors[scope];
+  }
+
+  function getMaskedValue(value: string): string {
+    return "•".repeat(Math.min(value.length, 20));
+  }
+</script>
+
+<Dialog.Root bind:open {onOpenChange}>
+  <Dialog.Content
+    class="sm:max-w-[700px] max-h-[80vh] overflow-hidden flex flex-col"
+  >
+    <Dialog.Header>
+      <Dialog.Title class="flex items-center gap-2">
+        <VariableIcon class="size-5" />
+        Variables & Secrets
+      </Dialog.Title>
+      <Dialog.Description>
+        Manage variables and secrets at different scopes. Variables can be used
+        in requests with {"{{VAR_NAME}}"} syntax.
+      </Dialog.Description>
+    </Dialog.Header>
+
+    <Tabs.Root value="global" class="flex-1 overflow-hidden">
+      <Tabs.List class="grid w-full grid-cols-3">
+        <Tabs.Trigger value="global">Global</Tabs.Trigger>
+        <Tabs.Trigger value="workspace" disabled={!workspaceId}
+          >Workspace</Tabs.Trigger
+        >
+        <Tabs.Trigger value="collection" disabled={!collectionId}
+          >Collection</Tabs.Trigger
+        >
+      </Tabs.List>
+
+      <div class="mt-4 overflow-auto max-h-[400px]">
+        <Tabs.Content value="global" class="space-y-2">
+          <div class="flex justify-between items-center mb-4">
+            <p class="text-sm text-muted-foreground">
+              Global variables are available in all workspaces.
+            </p>
+            <Button size="sm" onclick={() => openCreateDialog("global")}>
+              <PlusIcon class="size-4 mr-1" />
+              Add Variable
+            </Button>
+          </div>
+          {#if globalVariables.length === 0}
+            <div class="text-center py-8 text-muted-foreground">
+              No global variables defined.
+            </div>
+          {:else}
+            {#each globalVariables as variable (variable.id)}
+              {@render variableRow(variable)}
+            {/each}
+          {/if}
+        </Tabs.Content>
+
+        <Tabs.Content value="workspace" class="space-y-2">
+          <div class="flex justify-between items-center mb-4">
+            <p class="text-sm text-muted-foreground">
+              Workspace variables are available in this workspace only.
+            </p>
+            <Button
+              size="sm"
+              onclick={() => openCreateDialog("workspace")}
+              disabled={!workspaceId}
+            >
+              <PlusIcon class="size-4 mr-1" />
+              Add Variable
+            </Button>
+          </div>
+          {#if workspaceVariables.length === 0}
+            <div class="text-center py-8 text-muted-foreground">
+              No workspace variables defined.
+            </div>
+          {:else}
+            {#each workspaceVariables as variable (variable.id)}
+              {@render variableRow(variable)}
+            {/each}
+          {/if}
+        </Tabs.Content>
+
+        <Tabs.Content value="collection" class="space-y-2">
+          <div class="flex justify-between items-center mb-4">
+            <p class="text-sm text-muted-foreground">
+              Collection variables are available in this collection only.
+            </p>
+            <Button
+              size="sm"
+              onclick={() => openCreateDialog("collection")}
+              disabled={!collectionId}
+            >
+              <PlusIcon class="size-4 mr-1" />
+              Add Variable
+            </Button>
+          </div>
+          {#if collectionVariables.length === 0}
+            <div class="text-center py-8 text-muted-foreground">
+              No collection variables defined.
+            </div>
+          {:else}
+            {#each collectionVariables as variable (variable.id)}
+              {@render variableRow(variable)}
+            {/each}
+          {/if}
+        </Tabs.Content>
+      </div>
+    </Tabs.Root>
+
+    <Dialog.Footer class="mt-4">
+      <Button variant="outline" onclick={() => onOpenChange(false)}>
+        Close
+      </Button>
+    </Dialog.Footer>
+  </Dialog.Content>
+</Dialog.Root>
+
+{#snippet variableRow(variable: Variable)}
+  <div
+    class="flex items-center gap-3 p-3 rounded-lg border bg-card hover:bg-accent/50 transition-colors"
+  >
+    <div class="flex-1 min-w-0">
+      <div class="flex items-center gap-2">
+        <span class="font-mono font-medium text-sm">{variable.name}</span>
+        {#if variable.isSecret}
+          <LockIcon class="size-3 text-muted-foreground" />
+        {/if}
+        <Badge class={getScopeColor(variable.scope)} variant="secondary">
+          {variable.scope}
+        </Badge>
+      </div>
+      <div class="flex items-center gap-2 mt-1">
+        <code
+          class="text-xs text-muted-foreground font-mono truncate max-w-[300px]"
+        >
+          {#if variable.isSecret && !showSecretValues.has(variable.id)}
+            {getMaskedValue(variable.value)}
+          {:else}
+            {variable.value}
+          {/if}
+        </code>
+        {#if variable.isSecret}
+          <button
+            type="button"
+            class="text-muted-foreground hover:text-foreground"
+            onclick={() => toggleSecretVisibility(variable.id)}
+            aria-label={showSecretValues.has(variable.id)
+              ? "Hide value"
+              : "Show value"}
+          >
+            {#if showSecretValues.has(variable.id)}
+              <EyeOffIcon class="size-3" />
+            {:else}
+              <EyeIcon class="size-3" />
+            {/if}
+          </button>
+        {/if}
+      </div>
+      {#if variable.description}
+        <p class="text-xs text-muted-foreground mt-1">{variable.description}</p>
+      {/if}
+    </div>
+    <div class="flex items-center gap-1">
+      <Button
+        variant="ghost"
+        size="icon"
+        onclick={() => openEditDialog(variable)}
+        aria-label="Edit variable"
+      >
+        <PencilIcon class="size-4" />
+      </Button>
+      <Button
+        variant="ghost"
+        size="icon"
+        onclick={() => handleDelete(variable)}
+        aria-label="Delete variable"
+      >
+        <TrashIcon class="size-4 text-destructive" />
+      </Button>
+    </div>
+  </div>
+{/snippet}
+
+<Dialog.Root bind:open={editDialogOpen}>
+  <Dialog.Content class="sm:max-w-[425px]">
+    <Dialog.Header>
+      <Dialog.Title>
+        {isCreating ? "Create Variable" : "Edit Variable"}
+      </Dialog.Title>
+      <Dialog.Description>
+        {isCreating
+          ? "Add a new variable or secret."
+          : "Update variable details."}
+      </Dialog.Description>
+    </Dialog.Header>
+    <form
+      class="grid gap-4 py-4"
+      onsubmit={(e) => {
+        e.preventDefault();
+        handleSave();
+      }}
+    >
+      <div class="grid grid-cols-4 items-center gap-4">
+        <Label for="var-name" class="text-end">Name</Label>
+        <Input
+          id="var-name"
+          class="col-span-3 font-mono"
+          placeholder="VARIABLE_NAME"
+          bind:value={formName}
+          pattern="[A-Za-z_][A-Za-z0-9_]*"
+        />
+      </div>
+      <div class="grid grid-cols-4 items-center gap-4">
+        <Label for="var-value" class="text-end">Value</Label>
+        <Input
+          id="var-value"
+          class="col-span-3 font-mono"
+          type={formIsSecret ? "password" : "text"}
+          placeholder="Variable value"
+          bind:value={formValue}
+        />
+      </div>
+      <div class="grid grid-cols-4 items-center gap-4">
+        <Label for="var-desc" class="text-end">Description</Label>
+        <Textarea
+          id="var-desc"
+          class="col-span-3"
+          placeholder="Optional description"
+          bind:value={formDescription}
+          rows={2}
+        />
+      </div>
+      <div class="grid grid-cols-4 items-center gap-4">
+        <Label class="text-end">Secret</Label>
+        <div class="col-span-3 flex items-center gap-2">
+          <button
+            type="button"
+            role="switch"
+            aria-checked={formIsSecret}
+            aria-label="Mark as secret"
+            class="relative inline-flex h-6 w-11 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 {formIsSecret
+              ? 'bg-primary'
+              : 'bg-input'}"
+            onclick={() => (formIsSecret = !formIsSecret)}
+          >
+            <span
+              class="pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform {formIsSecret
+                ? 'translate-x-5'
+                : 'translate-x-0'}"
+            ></span>
+          </button>
+          <span class="text-sm text-muted-foreground">
+            {formIsSecret ? "Value will be hidden" : "Value will be visible"}
+          </span>
+        </div>
+      </div>
+      <Dialog.Footer>
+        <Button
+          type="button"
+          variant="outline"
+          onclick={() => (editDialogOpen = false)}
+        >
+          Cancel
+        </Button>
+        <Button type="submit" disabled={!formName.trim()}>
+          {isCreating ? "Create" : "Save"}
+        </Button>
+      </Dialog.Footer>
+    </form>
+  </Dialog.Content>
+</Dialog.Root>
diff --git a/src/lib/services/settings.ts b/src/lib/services/settings.ts
new file mode 100644
index 0000000..a1a047c
--- /dev/null
+++ b/src/lib/services/settings.ts
@@ -0,0 +1,33 @@
+import type { AppSettings } from "$lib/types/workspace";
+
+let settings: AppSettings = {
+  theme: "system",
+  defaultTimeout: 30000,
+  followRedirects: true,
+  validateSSL: true,
+  maxHistoryItems: 100,
+  autoSaveRequests: true,
+};
+
+export async function get_settings(): Promise<AppSettings> {
+  return { ...settings };
+}
+
+export async function update_settings(
+  updates: Partial<AppSettings>
+): Promise<AppSettings> {
+  settings = { ...settings, ...updates };
+  return { ...settings };
+}
+
+export async function reset_settings(): Promise<AppSettings> {
+  settings = {
+    theme: "system",
+    defaultTimeout: 30000,
+    followRedirects: true,
+    validateSSL: true,
+    maxHistoryItems: 100,
+    autoSaveRequests: true,
+  };
+  return { ...settings };
+}
diff --git a/src/lib/services/sync.ts b/src/lib/services/sync.ts
new file mode 100644
index 0000000..9340c1c
--- /dev/null
+++ b/src/lib/services/sync.ts
@@ -0,0 +1,278 @@
+import type { Workspace, WorkspaceSyncGroup } from "$lib/types/workspace";
+import type { Collection } from "$lib/types/collection";
+import type { Request } from "$lib/types/request";
+import type { Variable } from "$lib/types/variable";
+import {
+  get_collections_by_workspace,
+  get_standalone_requests_by_workspace,
+  create_collection,
+  create_request,
+} from "./collections";
+import {
+  get_workspace_variables,
+  create_variable,
+  update_variable,
+  get_variables_by_scope,
+} from "./variables";
+
+const syncGroups: Map<string, WorkspaceSyncGroup> = new Map();
+
+export async function get_sync_groups(): Promise<WorkspaceSyncGroup[]> {
+  return [...syncGroups.values()];
+}
+
+export async function get_sync_group(
+  id: string
+): Promise<WorkspaceSyncGroup | null> {
+  return syncGroups.get(id) ?? null;
+}
+
+export async function get_sync_group_for_workspace(
+  workspaceId: string
+): Promise<WorkspaceSyncGroup | null> {
+  for (const group of syncGroups.values()) {
+    if (group.workspaceIds.includes(workspaceId)) {
+      return group;
+    }
+  }
+  return null;
+}
+
+export async function create_sync_group(
+  name: string,
+  workspaceIds: string[],
+  syncedVariableNames: string[] = [],
+  syncSecrets: boolean = false
+): Promise<WorkspaceSyncGroup> {
+  const group: WorkspaceSyncGroup = {
+    id: crypto.randomUUID(),
+    name,
+    workspaceIds,
+    syncedVariableNames,
+    syncSecrets,
+  };
+  syncGroups.set(group.id, group);
+  return group;
+}
+
+export async function update_sync_group(
+  id: string,
+  updates: Partial<Omit<WorkspaceSyncGroup, "id">>
+): Promise<boolean> {
+  const group = syncGroups.get(id);
+  if (!group) return false;
+  Object.assign(group, updates);
+  return true;
+}
+
+export async function delete_sync_group(id: string): Promise<boolean> {
+  return syncGroups.delete(id);
+}
+
+export async function add_workspace_to_sync_group(
+  groupId: string,
+  workspaceId: string
+): Promise<boolean> {
+  const group = syncGroups.get(groupId);
+  if (!group) return false;
+  if (!group.workspaceIds.includes(workspaceId)) {
+    group.workspaceIds.push(workspaceId);
+  }
+  return true;
+}
+
+export async function remove_workspace_from_sync_group(
+  groupId: string,
+  workspaceId: string
+): Promise<boolean> {
+  const group = syncGroups.get(groupId);
+  if (!group) return false;
+  group.workspaceIds = group.workspaceIds.filter((id) => id !== workspaceId);
+  return true;
+}
+
+export type DuplicateWorkspaceOptions = {
+  sourceWorkspaceId: string;
+  newName: string;
+  newDescription: string;
+  environment?: string;
+  copyVariables: boolean;
+  copySecrets: boolean;
+  createSyncGroup: boolean;
+  syncGroupName?: string;
+  variablesToSync?: string[];
+};
+
+export type DuplicateWorkspaceResult = {
+  workspace: Workspace;
+  syncGroup?: WorkspaceSyncGroup;
+};
+
+export async function duplicate_workspace(
+  options: DuplicateWorkspaceOptions,
+  createWorkspaceFn: (workspace: Omit<Workspace, "Id">) => Promise<Workspace>
+): Promise<DuplicateWorkspaceResult> {
+  const {
+    sourceWorkspaceId,
+    newName,
+    newDescription,
+    environment,
+    copyVariables,
+    copySecrets,
+    createSyncGroup: shouldCreateSyncGroup,
+    syncGroupName,
+    variablesToSync = [],
+  } = options;
+
+  // Create the new workspace
+  const newWorkspace = await createWorkspaceFn({
+    Name: newName,
+    Description: newDescription,
+    environment,
+    syncGroupId: null,
+  });
+
+  // Copy collections and requests
+  const collections = await get_collections_by_workspace(sourceWorkspaceId);
+  const collectionIdMap = new Map<string, string>();
+
+  for (const collection of collections) {
+    const newCollection = await create_collection({
+      name: collection.name,
+      description: collection.description,
+      workspaceId: newWorkspace.Id,
+    });
+    collectionIdMap.set(collection.id, newCollection.id);
+
+    // Copy requests in collection
+    for (const request of collection.requests) {
+      await create_request({
+        name: request.name,
+        method: request.method,
+        url: request.url,
+        headers: [...request.headers],
+        params: [...request.params],
+        bodyType: request.bodyType,
+        body: request.body,
+        formData: [...request.formData],
+        collectionId: newCollection.id,
+        workspaceId: newWorkspace.Id,
+      });
+    }
+  }
+
+  // Copy standalone requests
+  const standaloneRequests = await get_standalone_requests_by_workspace(
+    sourceWorkspaceId
+  );
+  for (const request of standaloneRequests) {
+    await create_request({
+      name: request.name,
+      method: request.method,
+      url: request.url,
+      headers: [...request.headers],
+      params: [...request.params],
+      bodyType: request.bodyType,
+      body: request.body,
+      formData: [...request.formData],
+      collectionId: null,
+      workspaceId: newWorkspace.Id,
+    });
+  }
+
+  // Copy variables
+  if (copyVariables) {
+    const sourceVariables = await get_workspace_variables(sourceWorkspaceId);
+    for (const variable of sourceVariables) {
+      // Skip secrets if not copying them
+      if (variable.isSecret && !copySecrets) {
+        // Create variable with empty value for secrets
+        await create_variable({
+          name: variable.name,
+          value: "",
+          scope: "workspace",
+          scopeId: newWorkspace.Id,
+          isSecret: true,
+          description: variable.description,
+        });
+      } else {
+        await create_variable({
+          name: variable.name,
+          value: variable.value,
+          scope: "workspace",
+          scopeId: newWorkspace.Id,
+          isSecret: variable.isSecret,
+          description: variable.description,
+        });
+      }
+    }
+  }
+
+  // Create sync group if requested
+  let syncGroup: WorkspaceSyncGroup | undefined;
+  if (shouldCreateSyncGroup) {
+    syncGroup = await create_sync_group(
+      syncGroupName || `${newName} Sync Group`,
+      [sourceWorkspaceId, newWorkspace.Id],
+      variablesToSync,
+      copySecrets
+    );
+    newWorkspace.syncGroupId = syncGroup.id;
+  }
+
+  return { workspace: newWorkspace, syncGroup };
+}
+
+export async function sync_variables_in_group(
+  groupId: string,
+  sourceWorkspaceId: string
+): Promise<{ synced: number; skipped: number }> {
+  const group = syncGroups.get(groupId);
+  if (!group) return { synced: 0, skipped: 0 };
+
+  const sourceVariables = await get_workspace_variables(sourceWorkspaceId);
+  let synced = 0;
+  let skipped = 0;
+
+  for (const targetWorkspaceId of group.workspaceIds) {
+    if (targetWorkspaceId === sourceWorkspaceId) continue;
+
+    const targetVariables = await get_workspace_variables(targetWorkspaceId);
+    const targetVarMap = new Map(targetVariables.map((v) => [v.name, v]));
+
+    for (const sourceVar of sourceVariables) {
+      // Only sync variables that are in the sync list
+      if (!group.syncedVariableNames.includes(sourceVar.name)) {
+        skipped++;
+        continue;
+      }
+
+      // Skip secrets if not syncing them
+      if (sourceVar.isSecret && !group.syncSecrets) {
+        skipped++;
+        continue;
+      }
+
+      const targetVar = targetVarMap.get(sourceVar.name);
+      if (targetVar) {
+        // Update existing variable
+        await update_variable(targetVar.id, { value: sourceVar.value });
+        synced++;
+      } else {
+        // Create new variable in target workspace
+        await create_variable({
+          name: sourceVar.name,
+          value:
+            sourceVar.isSecret && !group.syncSecrets ? "" : sourceVar.value,
+          scope: "workspace",
+          scopeId: targetWorkspaceId,
+          isSecret: sourceVar.isSecret,
+          description: sourceVar.description,
+        });
+        synced++;
+      }
+    }
+  }
+
+  return { synced, skipped };
+}
diff --git a/src/lib/services/workspaces.ts b/src/lib/services/workspaces.ts
index 6aa0b3e..0177c9a 100644
--- a/src/lib/services/workspaces.ts
+++ b/src/lib/services/workspaces.ts
@@ -7,6 +7,8 @@ const ws: Map<string, Workspace> = new Map<string, Workspace>([
       Id: "1",
       Name: "Test 1",
       Description: "This is a test description",
+      environment: "Development",
+      syncGroupId: null,
     },
   ],
   [
@@ -15,6 +17,8 @@ const ws: Map<string, Workspace> = new Map<string, Workspace>([
       Id: "2",
       Name: "Test 2",
       Description: "This is a longer test description",
+      environment: "Production",
+      syncGroupId: null,
     },
   ],
   [
@@ -23,6 +27,7 @@ const ws: Map<string, Workspace> = new Map<string, Workspace>([
       Id: "3",
       Name: "Test 3",
       Description: "This is a slightly longer test description",
+      syncGroupId: null,
     },
   ],
   [
@@ -31,6 +36,7 @@ const ws: Map<string, Workspace> = new Map<string, Workspace>([
       Id: "4",
       Name: "Test 4",
       Description: "This is an even slightly longer test description",
+      syncGroupId: null,
     },
   ],
   [
@@ -40,6 +46,7 @@ const ws: Map<string, Workspace> = new Map<string, Workspace>([
       Name: "Test 5",
       Description:
         "This is a veryyyyyyyyyyyyyyyyyyyyyyyyyyy longggggggggggggggggggggggggggg test descriptionnnnnnnnnnnnnnnnnnnnnnnnnnnnnn",
+      syncGroupId: null,
     },
   ],
 ]);
@@ -67,8 +74,23 @@ export async function update_workspace(workspace: Workspace): Promise<boolean> {
   return true;
 }
 
-export async function create_workspace(workspace: Workspace): Promise<boolean> {
-  workspace.Id = crypto.randomUUID();
-  ws.set(workspace.Id, workspace);
-  return true;
+export async function create_workspace(
+  workspace: Omit<Workspace, "Id">
+): Promise<Workspace> {
+  const newWorkspace: Workspace = {
+    ...workspace,
+    Id: crypto.randomUUID(),
+  };
+  ws.set(newWorkspace.Id, newWorkspace);
+  return newWorkspace;
+}
+
+export async function delete_workspace(id: string): Promise<boolean> {
+  return ws.delete(id);
+}
+
+export async function get_workspaces_by_sync_group(
+  syncGroupId: string
+): Promise<Workspace[]> {
+  return [...ws.values()].filter((w) => w.syncGroupId === syncGroupId);
 }
diff --git a/src/lib/types/workspace.ts b/src/lib/types/workspace.ts
index da7331a..58426d5 100644
--- a/src/lib/types/workspace.ts
+++ b/src/lib/types/workspace.ts
@@ -2,4 +2,23 @@ export type Workspace = {
   Id: string;
   Name: string;
   Description: string;
+  syncGroupId?: string | null;
+  environment?: string;
+};
+
+export type WorkspaceSyncGroup = {
+  id: string;
+  name: string;
+  workspaceIds: string[];
+  syncedVariableNames: string[];
+  syncSecrets: boolean;
+};
+
+export type AppSettings = {
+  theme: "light" | "dark" | "system";
+  defaultTimeout: number;
+  followRedirects: boolean;
+  validateSSL: boolean;
+  maxHistoryItems: number;
+  autoSaveRequests: boolean;
 };
diff --git a/src/routes/workspaces/+page.svelte b/src/routes/workspaces/+page.svelte
index 0a5429d..20978cb 100644
--- a/src/routes/workspaces/+page.svelte
+++ b/src/routes/workspaces/+page.svelte
@@ -1,30 +1,49 @@
 <script lang="ts">
   import * as Empty from "$lib/components/ui/empty/index.js";
+  import * as DropdownMenu from "$lib/components/ui/dropdown-menu/index.js";
   import { Button } from "$lib/components/ui/button/index.js";
+  import { Badge } from "$lib/components/ui/badge/index.js";
   import FolderCodeIcon from "@lucide/svelte/icons/folder-code";
+  import SettingsIcon from "@lucide/svelte/icons/settings";
+  import VariableIcon from "@lucide/svelte/icons/variable";
+  import MoreVerticalIcon from "@lucide/svelte/icons/more-vertical";
+  import CopyIcon from "@lucide/svelte/icons/copy";
+  import PencilIcon from "@lucide/svelte/icons/pencil";
+  import TrashIcon from "@lucide/svelte/icons/trash-2";
   import {
     create_workspace,
     get_workspaces,
     update_workspace,
+    delete_workspace,
   } from "$lib/services/workspaces";
+  import {
+    duplicate_workspace,
+    type DuplicateWorkspaceOptions,
+  } from "$lib/services/sync";
   import type { Workspace } from "$lib/types/workspace";
   import * as Card from "$lib/components/ui/card/index";
   import * as Dialog from "$lib/components/ui/dialog/index.js";
   import { Input } from "$lib/components/ui/input/index.js";
   import { Label } from "$lib/components/ui/label/index.js";
   import { goto } from "$app/navigation";
+  import SettingsDialog from "$lib/components/settings-dialog.svelte";
+  import VariablesPanel from "$lib/components/variables-panel.svelte";
+  import DuplicateWorkspaceDialog from "$lib/components/duplicate-workspace-dialog.svelte";
 
   $effect(() => {
-    get_workspaces().then((ws) => {
-      if (ws.length == 0) {
-        showPrompt = true;
-      } else {
-        console.log(ws);
-        workspaces = ws;
-      }
-    });
+    loadWorkspaces();
   });
 
+  async function loadWorkspaces() {
+    const ws = await get_workspaces();
+    if (ws.length == 0) {
+      showPrompt = true;
+    } else {
+      workspaces = ws;
+      showPrompt = false;
+    }
+  }
+
   let showPrompt = $state(false);
   let workspaces = $state<Workspace[]>([]);
   let dialogOpen = $state(false);
@@ -33,6 +52,13 @@
   let workspaceName = $state("");
   let workspaceDescription = $state("");
 
+  let settingsOpen = $state(false);
+  let variablesOpen = $state(false);
+  let duplicateDialogOpen = $state(false);
+  let workspaceToDuplicate = $state<Workspace | null>(null);
+  let deleteDialogOpen = $state(false);
+  let workspaceToDelete = $state<Workspace | null>(null);
+
   function openCreateDialog() {
     dialogMode = "create";
     selectedWorkspace = null;
@@ -49,37 +75,54 @@
     dialogOpen = true;
   }
 
+  function openDuplicateDialog(workspace: Workspace) {
+    workspaceToDuplicate = workspace;
+    duplicateDialogOpen = true;
+  }
+
+  function openDeleteDialog(workspace: Workspace) {
+    workspaceToDelete = workspace;
+    deleteDialogOpen = true;
+  }
+
   function handleWorkspaceClick(id: string) {
-    goto(`/workspaces/${id}`)
+    goto(`/workspaces/${id}`);
   }
 
   async function handleDialogSubmit() {
-    let success = false;
     if (dialogMode === "create") {
-      const w: Workspace = {
-        // Id will be assigned in create_workspace
-        Id: "",
+      await create_workspace({
         Name: workspaceName,
         Description: workspaceDescription,
-      };
-      success = await create_workspace(w);
+      });
     } else if (selectedWorkspace != null) {
       const w: Workspace = {
         Id: selectedWorkspace.Id,
         Name: workspaceName,
         Description: workspaceDescription,
       };
-      success = await update_workspace(w);
-    }
-
-    if (success) {
-      const updated = await get_workspaces();
-      workspaces = updated;
-      showPrompt = updated.length === 0;
+      await update_workspace(w);
     }
 
+    await loadWorkspaces();
     dialogOpen = false;
   }
+
+  async function handleDuplicate(options: DuplicateWorkspaceOptions) {
+    await duplicate_workspace(options, async (ws) => {
+      return await create_workspace(ws);
+    });
+    await loadWorkspaces();
+  }
+
+  async function handleDeleteConfirm() {
+    if (workspaceToDelete) {
+      await delete_workspace(workspaceToDelete.Id);
+      await loadWorkspaces();
+    }
+    deleteDialogOpen = false;
+    workspaceToDelete = null;
+  }
 </script>
 
 <Dialog.Root bind:open={dialogOpen}>
@@ -107,7 +150,25 @@
     <div class="min-h-[calc(100vh-4rem)] p-6 space-y-4">
       <div class="flex items-center justify-between">
         <h1 class="text-2xl font-semibold">Workspaces</h1>
-        <Button onclick={openCreateDialog}>Create Workspace</Button>
+        <div class="flex items-center gap-2">
+          <Button
+            variant="outline"
+            size="icon"
+            onclick={() => (variablesOpen = true)}
+            aria-label="Global Variables"
+          >
+            <VariableIcon class="size-4" />
+          </Button>
+          <Button
+            variant="outline"
+            size="icon"
+            onclick={() => (settingsOpen = true)}
+            aria-label="Settings"
+          >
+            <SettingsIcon class="size-4" />
+          </Button>
+          <Button onclick={openCreateDialog}>Create Workspace</Button>
+        </div>
       </div>
       <div
         class="grid gap-6
@@ -119,22 +180,69 @@
       >
         {#each workspaces as workspace (workspace.Id)}
           <Card.Root
-            class="min-h-40 w-full max-w-xs mx-auto flex flex-col justify-between cursor-pointer hover:shadow-md transition-shadow"
+            class="min-h-40 w-full max-w-xs mx-auto flex flex-col justify-between hover:shadow-md transition-shadow group"
           >
-            <Card.Header>
-              <Card.Title class="truncate">{workspace.Name}</Card.Title>
-              <Card.Description class="text-xs text-muted-foreground">
+            <Card.Header class="relative">
+              <div
+                class="absolute top-2 right-2 opacity-0 group-hover:opacity-100 transition-opacity"
+              >
+                <DropdownMenu.Root>
+                  <DropdownMenu.Trigger>
+                    {#snippet child({ props })}
+                      <Button
+                        variant="ghost"
+                        size="icon"
+                        class="h-8 w-8"
+                        {...props}
+                        aria-label="Workspace options"
+                      >
+                        <MoreVerticalIcon class="size-4" />
+                      </Button>
+                    {/snippet}
+                  </DropdownMenu.Trigger>
+                  <DropdownMenu.Content align="end">
+                    <DropdownMenu.Item
+                      onclick={() => openEditDialog(workspace)}
+                    >
+                      <PencilIcon class="size-4 mr-2" />
+                      Edit
+                    </DropdownMenu.Item>
+                    <DropdownMenu.Item
+                      onclick={() => openDuplicateDialog(workspace)}
+                    >
+                      <CopyIcon class="size-4 mr-2" />
+                      Duplicate
+                    </DropdownMenu.Item>
+                    <DropdownMenu.Separator />
+                    <DropdownMenu.Item
+                      class="text-destructive"
+                      onclick={() => openDeleteDialog(workspace)}
+                    >
+                      <TrashIcon class="size-4 mr-2" />
+                      Delete
+                    </DropdownMenu.Item>
+                  </DropdownMenu.Content>
+                </DropdownMenu.Root>
+              </div>
+              <Card.Title class="truncate pr-8">{workspace.Name}</Card.Title>
+              <Card.Description
+                class="text-xs text-muted-foreground line-clamp-2"
+              >
                 {workspace.Description}
               </Card.Description>
+              {#if workspace.environment}
+                <Badge variant="secondary" class="w-fit mt-2"
+                  >{workspace.environment}</Badge
+                >
+              {/if}
             </Card.Header>
             <Card.Footer class="flex items-center justify-center gap-2">
-              <Button size="sm" class="justify-center" onclick={() => handleWorkspaceClick(workspace.Id)}>Open</Button>
               <Button
                 size="sm"
-                class="justify-center"
-                onclick={() => openEditDialog(workspace)}
+                class="justify-center flex-1"
+                onclick={() => handleWorkspaceClick(workspace.Id)}
               >
-                Edit
+                Open
               </Button>
             </Card.Footer>
           </Card.Root>
@@ -181,3 +289,40 @@
     </form>
   </Dialog.Content>
 </Dialog.Root>
+
+<Dialog.Root bind:open={deleteDialogOpen}>
+  <Dialog.Content class="sm:max-w-[425px]">
+    <Dialog.Header>
+      <Dialog.Title>Delete Workspace</Dialog.Title>
+      <Dialog.Description>
+        Are you sure you want to delete "{workspaceToDelete?.Name}"? This will
+        permanently delete all collections, requests, and variables in this
+        workspace.
+      </Dialog.Description>
+    </Dialog.Header>
+    <Dialog.Footer>
+      <Button variant="outline" onclick={() => (deleteDialogOpen = false)}
+        >Cancel</Button
+      >
+      <Button variant="destructive" onclick={handleDeleteConfirm}>Delete</Button
+      >
+    </Dialog.Footer>
+  </Dialog.Content>
+</Dialog.Root>
+
+<SettingsDialog
+  bind:open={settingsOpen}
+  onOpenChange={(v) => (settingsOpen = v)}
+/>
+
+<VariablesPanel
+  bind:open={variablesOpen}
+  onOpenChange={(v) => (variablesOpen = v)}
+/>
+
+<DuplicateWorkspaceDialog
+  bind:open={duplicateDialogOpen}
+  onOpenChange={(v) => (duplicateDialogOpen = v)}
+  sourceWorkspace={workspaceToDuplicate}
+  onDuplicate={handleDuplicate}
+/>
diff --git a/src/routes/workspaces/[id]/+page.svelte b/src/routes/workspaces/[id]/+page.svelte
index ace3479..7b97d6d 100644
--- a/src/routes/workspaces/[id]/+page.svelte
+++ b/src/routes/workspaces/[id]/+page.svelte
@@ -10,7 +10,11 @@
   import RequestPanel from "$lib/components/request-panel.svelte";
   import * as Empty from "$lib/components/ui/empty/index.js";
   import SendIcon from "@lucide/svelte/icons/send";
+  import VariableIcon from "@lucide/svelte/icons/variable";
+  import SettingsIcon from "@lucide/svelte/icons/settings";
   import { get_workspace } from "$lib/services/workspaces";
+  import VariablesPanel from "$lib/components/variables-panel.svelte";
+  import SettingsDialog from "$lib/components/settings-dialog.svelte";
   import {
     get_collections_by_workspace,
     get_standalone_requests_by_workspace,
@@ -39,6 +43,9 @@
   let loading = $state(false);
   let resolvedVariables = $state<ResolvedVariable[]>([]);
 
+  let variablesOpen = $state(false);
+  let settingsOpen = $state(false);
+
   let collectionDialogOpen = $state(false);
   let collectionDialogMode = $state<"create" | "edit">("create");
   let editingCollection = $state<Collection | null>(null);
@@ -280,6 +287,24 @@
             </h1>
           {/if}
         </div>
+        <div class="flex items-center gap-1">
+          <Button
+            variant="ghost"
+            size="icon"
+            onclick={() => (variablesOpen = true)}
+            aria-label="Variables"
+          >
+            <VariableIcon class="size-4" />
+          </Button>
+          <Button
+            variant="ghost"
+            size="icon"
+            onclick={() => (settingsOpen = true)}
+            aria-label="Settings"
+          >
+            <SettingsIcon class="size-4" />
+          </Button>
+        </div>
       </header>
 
       <div class="flex-1 overflow-hidden flex flex-col">
@@ -412,3 +437,15 @@
     </Dialog.Footer>
   </Dialog.Content>
 </Dialog.Root>
+
+<VariablesPanel
+  bind:open={variablesOpen}
+  onOpenChange={(v) => (variablesOpen = v)}
+  workspaceId={params.id}
+  collectionId={selectedRequest?.collectionId ?? undefined}
+/>
+
+<SettingsDialog
+  bind:open={settingsOpen}
+  onOpenChange={(v) => (settingsOpen = v)}
+/>