diff --git a/docker/web/ModelSelector.svelte b/docker/web/ModelSelector.svelte
index 56580ab..940f592 100644
--- a/docker/web/ModelSelector.svelte
+++ b/docker/web/ModelSelector.svelte
@@ -1,20 +1,66 @@
 <script lang="ts">
 	import { models } from '$lib/stores';
+	import { flyAndScale } from '$lib/utils/transitions';
 	import WorkspaceFiles from './WorkspaceFiles.svelte';
 
 	export let selectedModels = [''];
 	export let disabled = false;
 	export let showSetDefault = true;
-	let showWorkspace = false;
 
 	const modelOptions = [
-		{ id: 'luna', label: 'Luna', thinking: '开启 · 不分档' },
-		{ id: 'terra', label: 'Terra', thinking: '开启 · 不分档' },
-		{ id: 'sol', label: 'Sol', thinking: '开启 · 不分档' },
-		{ id: 'deepseek-v4-pro', label: 'DeepSeek', thinking: '极高' }
+		{
+			id: 'luna',
+			label: 'Luna',
+			description: '快速、轻量的本地 Agent',
+			location: '本地',
+			accent: 'bg-violet-100 text-violet-700 dark:bg-violet-500/15 dark:text-violet-300',
+			thinking: '开启',
+			thinkingTitle: '思考模式',
+			thinkingHelp: '当前固定开启。此模型只支持思考开关，不提供轻、中、高强度档位。'
+		},
+		{
+			id: 'terra',
+			label: 'Terra',
+			description: '速度与任务能力均衡',
+			location: '本地',
+			accent: 'bg-sky-100 text-sky-700 dark:bg-sky-500/15 dark:text-sky-300',
+			thinking: '开启',
+			thinkingTitle: '思考模式',
+			thinkingHelp: '当前固定开启。此模型只支持思考开关，不提供轻、中、高强度档位。'
+		},
+		{
+			id: 'sol',
+			label: 'Sol',
+			description: '面向复杂任务的本地 Agent',
+			location: '本地',
+			accent: 'bg-amber-100 text-amber-700 dark:bg-amber-500/15 dark:text-amber-300',
+			thinking: '开启',
+			thinkingTitle: '思考模式',
+			thinkingHelp: '当前固定开启。此模型只支持思考开关，不提供轻、中、高强度档位。'
+		},
+		{
+			id: 'deepseek-v4-pro',
+			label: 'DeepSeek V4 Pro',
+			description: '云端高能力 Agent',
+			location: '云端',
+			accent: 'bg-emerald-100 text-emerald-700 dark:bg-emerald-500/15 dark:text-emerald-300',
+			thinking: '极高',
+			thinkingTitle: '推理强度',
+			thinkingHelp: '当前固定为极高（max），由 Agent 服务端管理。'
+		}
 	];
 	const allowed = new Set(modelOptions.map((item) => item.id));
 
+	let showWorkspace = false;
+	let showModels = false;
+	let showThinking = false;
+	let modelTrigger: HTMLElement | null = null;
+	let modelPanel: HTMLElement | null = null;
+	let thinkingTrigger: HTMLElement | null = null;
+	let thinkingPanel: HTMLElement | null = null;
+	let modelPosition = { top: 0, left: 0, width: 320 };
+	let thinkingPosition = { top: 0, left: 0, width: 288 };
+
 	$: selected = allowed.has(selectedModels?.[0]) ? selectedModels[0] : 'terra';
 	$: selectedOption = modelOptions.find((item) => item.id === selected) ?? modelOptions[1];
 	$: availableIds = new Set($models.map((model) => model.id));
@@ -26,50 +72,290 @@
 		if (fallback) selectedModels = [fallback];
 	}
 
+	const portal = (node: HTMLElement) => {
+		document.body.appendChild(node);
+		return {
+			destroy() {
+				node.remove();
+			}
+		};
+	};
+
+	const positionFor = (trigger: HTMLElement | null, preferredWidth: number) => {
+		if (!trigger || typeof window === 'undefined') {
+			return { top: 0, left: 0, width: preferredWidth };
+		}
+
+		const rect = trigger.getBoundingClientRect();
+		const width = Math.min(preferredWidth, window.innerWidth - 16);
+		return {
+			top: rect.bottom + 8,
+			left: Math.max(8, Math.min(rect.left, window.innerWidth - width - 8)),
+			width
+		};
+	};
+
+	const updatePositions = () => {
+		if (showModels) modelPosition = positionFor(modelTrigger, 320);
+		if (showThinking) thinkingPosition = positionFor(thinkingTrigger, 288);
+	};
+
+	const toggleModels = () => {
+		if (disabled) return;
+		showThinking = false;
+		showModels = !showModels;
+		if (showModels) modelPosition = positionFor(modelTrigger, 320);
+	};
+
+	const toggleThinking = () => {
+		showModels = false;
+		showThinking = !showThinking;
+		if (showThinking) thinkingPosition = positionFor(thinkingTrigger, 288);
+	};
+
 	const chooseModel = (modelId: string) => {
-		if (disabled || !availableIds.has(modelId)) return;
+		if (disabled || ($models.length > 0 && !availableIds.has(modelId))) return;
 		selectedModels = [modelId];
+		showModels = false;
+	};
+
+	const closePopovers = (event: PointerEvent) => {
+		const target = event.target as Node;
+		if (
+			(modelTrigger?.contains(target) ?? false) ||
+			(modelPanel?.contains(target) ?? false) ||
+			(thinkingTrigger?.contains(target) ?? false) ||
+			(thinkingPanel?.contains(target) ?? false)
+		) {
+			return;
+		}
+		showModels = false;
+		showThinking = false;
+	};
+
+	const handleKeydown = (event: KeyboardEvent) => {
+		if (event.key !== 'Escape') return;
+		const focusTarget = showThinking ? thinkingTrigger : modelTrigger;
+		showModels = false;
+		showThinking = false;
+		focusTarget?.focus();
 	};
 </script>
 
-<div class="flex max-w-full items-center gap-2 select-none">
-	<div
-		class="flex items-center overflow-x-auto rounded-xl border border-gray-200/80 p-1 text-xs dark:border-gray-700/80"
-		aria-label="模型"
-	>
-		{#each modelOptions as item}
-			<button
-				type="button"
-				class="whitespace-nowrap rounded-lg px-2.5 py-1.5 font-medium transition {selected === item.id
-					? 'bg-gray-900 text-white dark:bg-white dark:text-gray-900'
-					: 'text-gray-500 hover:bg-gray-100 dark:text-gray-400 dark:hover:bg-gray-800'}"
-				on:click={() => chooseModel(item.id)}
-				disabled={disabled || ($models.length > 0 && !availableIds.has(item.id))}
-				title={item.id === 'deepseek-v4-pro' ? 'DeepSeek V4 Pro' : item.label}
-			>
-				{item.label}
-			</button>
-		{/each}
-	</div>
+<svelte:window
+	on:pointerdown={closePopovers}
+	on:keydown={handleKeydown}
+	on:resize={updatePositions}
+	on:scroll={updatePositions}
+/>
 
-	<div
-		class="whitespace-nowrap rounded-xl bg-gray-100/90 px-2.5 py-2 text-xs text-gray-500 dark:bg-gray-800/90 dark:text-gray-400"
-		title="模型与思考能力是两个独立概念"
+<div class="flex max-w-full select-none items-center gap-0.5">
+	<button
+		bind:this={modelTrigger}
+		type="button"
+		class="group flex min-w-0 max-w-[13rem] items-center gap-1.5 rounded-xl px-2.5 py-2 text-sm font-semibold text-gray-900 outline-hidden transition hover:bg-gray-100 focus-visible:ring-2 focus-visible:ring-gray-300 disabled:cursor-not-allowed disabled:opacity-50 dark:text-white dark:hover:bg-gray-800 dark:focus-visible:ring-gray-600 sm:max-w-[16rem]"
+		on:click={toggleModels}
+		disabled={disabled}
+		aria-label="选择模型，当前为 {selectedOption.label}"
+		aria-haspopup="listbox"
+		aria-expanded={showModels}
 	>
-		思考 <span class="font-medium text-gray-800 dark:text-gray-200">{selectedOption.thinking}</span>
-	</div>
+		<span class="truncate">{selectedOption.label}</span>
+		<svg
+			viewBox="0 0 20 20"
+			class="size-3.5 shrink-0 text-gray-400 transition-transform duration-150 {showModels
+				? 'rotate-180'
+				: ''}"
+			fill="none"
+			stroke="currentColor"
+			stroke-width="1.8"
+			aria-hidden="true"
+		>
+			<path d="m6 8 4 4 4-4" stroke-linecap="round" stroke-linejoin="round" />
+		</svg>
+	</button>
+
+	<div class="mx-0.5 h-4 w-px bg-gray-200 dark:bg-gray-700" aria-hidden="true" />
+
+	<button
+		bind:this={thinkingTrigger}
+		type="button"
+		class="group flex shrink-0 items-center gap-1.5 rounded-xl px-2.5 py-2 text-xs font-medium text-gray-500 outline-hidden transition hover:bg-gray-100 hover:text-gray-900 focus-visible:ring-2 focus-visible:ring-gray-300 dark:text-gray-400 dark:hover:bg-gray-800 dark:hover:text-white dark:focus-visible:ring-gray-600"
+		on:click={toggleThinking}
+		aria-label="{selectedOption.thinkingTitle}：{selectedOption.thinking}"
+		aria-haspopup="dialog"
+		aria-expanded={showThinking}
+	>
+		<svg
+			viewBox="0 0 20 20"
+			class="size-3.5 text-gray-400 group-hover:text-gray-600 dark:group-hover:text-gray-200"
+			fill="none"
+			stroke="currentColor"
+			stroke-width="1.6"
+			aria-hidden="true"
+		>
+			<path
+				d="M10 2.5c.3 2.4 1.5 3.6 4 4-2.5.4-3.7 1.6-4 4-.4-2.4-1.6-3.6-4-4 2.4-.4 3.6-1.6 4-4Z"
+				stroke-linecap="round"
+				stroke-linejoin="round"
+			/>
+			<path d="M4.5 11.5c.2 1.7 1 2.5 2.7 2.7-1.7.3-2.5 1.1-2.7 2.8-.3-1.7-1.1-2.5-2.8-2.8 1.7-.2 2.5-1 2.8-2.7Z" />
+			<path d="M15 12.5c.2 1.2.8 1.8 2 2-1.2.2-1.8.8-2 2-.2-1.2-.8-1.8-2-2 1.2-.2 1.8-.8 2-2Z" />
+		</svg>
+		<span class="hidden sm:inline">{selectedOption.thinkingTitle}</span>
+		<span class="text-gray-800 dark:text-gray-200">{selectedOption.thinking}</span>
+		<svg
+			viewBox="0 0 20 20"
+			class="size-3 shrink-0 text-gray-400 transition-transform duration-150 {showThinking
+				? 'rotate-180'
+				: ''}"
+			fill="none"
+			stroke="currentColor"
+			stroke-width="1.8"
+			aria-hidden="true"
+		>
+			<path d="m6 8 4 4 4-4" stroke-linecap="round" stroke-linejoin="round" />
+		</svg>
+	</button>
 
 	<button
 		type="button"
-		class="rounded-xl border border-gray-200/80 p-2 text-gray-500 transition hover:bg-gray-100 hover:text-gray-900 dark:border-gray-700/80 dark:text-gray-400 dark:hover:bg-gray-800 dark:hover:text-white"
+		class="ml-0.5 rounded-xl p-2 text-gray-500 outline-hidden transition hover:bg-gray-100 hover:text-gray-900 focus-visible:ring-2 focus-visible:ring-gray-300 dark:text-gray-400 dark:hover:bg-gray-800 dark:hover:text-white dark:focus-visible:ring-gray-600"
 		on:click={() => (showWorkspace = true)}
 		title="工作区文件"
 		aria-label="工作区文件"
 	>
-		<svg viewBox="0 0 24 24" class="size-4" fill="none" stroke="currentColor" stroke-width="1.8">
+		<svg
+			viewBox="0 0 24 24"
+			class="size-4"
+			fill="none"
+			stroke="currentColor"
+			stroke-width="1.8"
+			aria-hidden="true"
+		>
 			<path d="M3.5 6.5h6l2 2h9v10h-17z" stroke-linejoin="round" />
 		</svg>
 	</button>
 </div>
 
+{#if showModels}
+	<div
+		use:portal
+		bind:this={modelPanel}
+		class="fixed z-[9999]"
+		style="top: {modelPosition.top}px; left: {modelPosition.left}px; width: {modelPosition.width}px;"
+		transition:flyAndScale
+	>
+		<div
+			class="overflow-hidden rounded-2xl border border-gray-200/70 bg-white p-1.5 text-gray-900 shadow-xl shadow-black/10 dark:border-gray-700/70 dark:bg-gray-850 dark:text-white dark:shadow-black/30"
+			role="listbox"
+			aria-label="可用模型"
+		>
+			<div class="px-2.5 pb-1.5 pt-1 text-xs font-medium text-gray-400 dark:text-gray-500">
+				选择模型
+			</div>
+			{#each modelOptions as item}
+				{@const unavailable = $models.length > 0 && !availableIds.has(item.id)}
+				<button
+					type="button"
+					role="option"
+					aria-selected={selected === item.id}
+					class="group flex w-full items-center gap-3 rounded-xl px-2.5 py-2.5 text-left outline-hidden transition hover:bg-gray-100 focus-visible:bg-gray-100 disabled:cursor-not-allowed disabled:opacity-40 dark:hover:bg-gray-800 dark:focus-visible:bg-gray-800"
+					on:click={() => chooseModel(item.id)}
+					disabled={disabled || unavailable}
+				>
+					<span
+						class="flex size-8 shrink-0 items-center justify-center rounded-full text-xs font-bold {item.accent}"
+						aria-hidden="true"
+					>
+						{item.label.slice(0, 1)}
+					</span>
+					<span class="min-w-0 flex-1">
+						<span class="flex items-center gap-2">
+							<span class="truncate text-sm font-medium">{item.label}</span>
+							<span
+								class="rounded-full bg-gray-100 px-1.5 py-0.5 text-[10px] font-medium text-gray-500 dark:bg-gray-800 dark:text-gray-400"
+							>
+								{item.location}
+							</span>
+						</span>
+						<span class="mt-0.5 block truncate text-xs text-gray-500 dark:text-gray-400">
+							{unavailable ? '当前不可用' : item.description}
+						</span>
+					</span>
+					{#if selected === item.id}
+						<svg
+							viewBox="0 0 20 20"
+							class="size-4 shrink-0 text-gray-900 dark:text-white"
+							fill="none"
+							stroke="currentColor"
+							stroke-width="2"
+							aria-hidden="true"
+						>
+							<path d="m5 10 3 3 7-7" stroke-linecap="round" stroke-linejoin="round" />
+						</svg>
+					{/if}
+				</button>
+			{/each}
+		</div>
+	</div>
+{/if}
+
+{#if showThinking}
+	<div
+		use:portal
+		bind:this={thinkingPanel}
+		class="fixed z-[9999]"
+		style="top: {thinkingPosition.top}px; left: {thinkingPosition.left}px; width: {thinkingPosition.width}px;"
+		transition:flyAndScale
+	>
+		<div
+			class="rounded-2xl border border-gray-200/70 bg-white p-2 text-gray-900 shadow-xl shadow-black/10 dark:border-gray-700/70 dark:bg-gray-850 dark:text-white dark:shadow-black/30"
+			role="dialog"
+			aria-label="{selectedOption.thinkingTitle}说明"
+		>
+			<div class="flex items-center gap-3 rounded-xl bg-gray-50 px-3 py-2.5 dark:bg-gray-800/70">
+				<span
+					class="flex size-8 shrink-0 items-center justify-center rounded-full bg-gray-900 text-white dark:bg-white dark:text-gray-900"
+					aria-hidden="true"
+				>
+					<svg
+						viewBox="0 0 20 20"
+						class="size-4"
+						fill="none"
+						stroke="currentColor"
+						stroke-width="1.6"
+					>
+						<path
+							d="M10 2.5c.3 2.4 1.5 3.6 4 4-2.5.4-3.7 1.6-4 4-.4-2.4-1.6-3.6-4-4 2.4-.4 3.6-1.6 4-4Z"
+							stroke-linecap="round"
+							stroke-linejoin="round"
+						/>
+						<path d="M5 12c.2 1.7 1 2.5 2.7 2.7C6 15 5.2 15.8 5 17.5c-.3-1.7-1.1-2.5-2.8-2.8C3.9 14.5 4.7 13.7 5 12Z" />
+					</svg>
+				</span>
+				<span class="min-w-0 flex-1">
+					<span class="block text-xs text-gray-500 dark:text-gray-400">
+						{selectedOption.thinkingTitle}
+					</span>
+					<span class="block text-sm font-semibold">{selectedOption.thinking}</span>
+				</span>
+				<svg
+					viewBox="0 0 20 20"
+					class="size-4 shrink-0"
+					fill="none"
+					stroke="currentColor"
+					stroke-width="2"
+					aria-hidden="true"
+				>
+					<path d="m5 10 3 3 7-7" stroke-linecap="round" stroke-linejoin="round" />
+				</svg>
+			</div>
+			<p class="px-2 pb-1 pt-2.5 text-xs leading-5 text-gray-500 dark:text-gray-400">
+				{selectedOption.thinkingHelp}
+			</p>
+		</div>
+	</div>
+{/if}
+
 <WorkspaceFiles bind:show={showWorkspace} />