diff --git a/web/src/components/LLMQueryPanel.vue b/web/src/components/LLMQueryPanel.vue
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+++ b/web/src/components/LLMQueryPanel.vue
@@ -0,0 +1,265 @@
+<!-- web/src/components/LLMQueryPanel.vue -->
+<!-- BSL 1.1 License -->
+<template>
+  <div class="llm-panel-wrapper">
+    <button
+      type="button"
+      class="llm-panel-toggle"
+      :class="{ 'llm-panel-toggle--open': isOpen }"
+      :aria-expanded="String(isOpen)"
+      aria-controls="llm-panel"
+      @click="toggle"
+    >
+      <span class="llm-panel-toggle__icon" aria-hidden="true">✦</span>
+      Build with AI
+      <span class="llm-panel-toggle__chevron" aria-hidden="true">{{ isOpen ? '▲' : '▾' }}</span>
+    </button>
+
+    <section
+      id="llm-panel"
+      class="llm-panel"
+      :class="{ 'llm-panel--open': isOpen }"
+      :hidden="!isOpen"
+    >
+      <label for="llm-input" class="llm-panel__label">
+        Describe what you're looking for
+      </label>
+      <textarea
+        id="llm-input"
+        ref="textareaRef"
+        v-model="inputText"
+        class="llm-panel__textarea"
+        rows="2"
+        placeholder="e.g. used RTX 3080 under $300, no mining cards or for-parts listings"
+        :disabled="isLoading"
+        @keydown.escape.prevent="handleEscape"
+        @keydown.ctrl.enter.prevent="onBuild"
+      />
+
+      <div class="llm-panel__actions">
+        <button
+          type="button"
+          class="llm-panel__build-btn"
+          :disabled="isLoading || !inputText.trim()"
+          @click="onBuild"
+        >
+          {{ isLoading ? 'Building…' : 'Build Search' }}
+        </button>
+
+        <span
+          role="status"
+          aria-live="polite"
+          class="llm-panel__status-pill"
+          :class="`llm-panel__status-pill--${status}`"
+        >
+          <span v-if="status === 'thinking'">
+            <span class="llm-panel__spinner" aria-hidden="true" />
+            Thinking…
+          </span>
+          <span v-else-if="status === 'done'">Filters updated</span>
+          <span v-else-if="status === 'error'">Error</span>
+        </span>
+      </div>
+
+      <p v-if="error" class="llm-panel__error" role="alert">
+        {{ error }}
+      </p>
+
+      <p v-if="status === 'done' && explanation" class="llm-panel__explanation">
+        {{ explanation }}
+      </p>
+
+      <label class="llm-panel__autorun">
+        <input
+          type="checkbox"
+          :checked="autoRun"
+          @change="setAutoRun(($event.target as HTMLInputElement).checked)"
+        />
+        Run search automatically after building
+      </label>
+    </section>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, nextTick, watch } from 'vue'
+import { useLLMQueryBuilder } from '@/composables/useLLMQueryBuilder'
+
+const {
+  isOpen,
+  isLoading,
+  status,
+  explanation,
+  error,
+  autoRun,
+  toggle,
+  setAutoRun,
+  buildQuery,
+} = useLLMQueryBuilder()
+
+const inputText = ref('')
+const textareaRef = ref<HTMLTextAreaElement | null>(null)
+
+watch(isOpen, async (open) => {
+  if (open) {
+    await nextTick()
+    textareaRef.value?.focus()
+  }
+})
+
+async function onBuild() {
+  await buildQuery(inputText.value)
+}
+
+function handleEscape() {
+  toggle()
+  const toggleBtn = document.querySelector<HTMLButtonElement>('[aria-controls="llm-panel"]')
+  toggleBtn?.focus()
+}
+</script>
+
+<style scoped>
+.llm-panel-wrapper {
+  width: 100%;
+}
+
+.llm-panel-toggle {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--space-2);
+  padding: var(--space-2) var(--space-3);
+  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
+  border: 1px solid color-mix(in srgb, var(--color-accent) 35%, transparent);
+  border-radius: var(--radius-md);
+  color: var(--color-accent);
+  font-size: 0.85rem;
+  font-weight: 500;
+  cursor: pointer;
+  transition: background 0.15s, border-color 0.15s;
+  margin-bottom: var(--space-2);
+}
+
+.llm-panel-toggle:hover,
+.llm-panel-toggle--open {
+  background: color-mix(in srgb, var(--color-accent) 20%, transparent);
+  border-color: var(--color-accent);
+}
+
+.llm-panel {
+  display: none;
+  flex-direction: column;
+  gap: var(--space-3);
+  padding: var(--space-4);
+  background: var(--color-surface-2);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-md);
+  margin-bottom: var(--space-3);
+}
+
+.llm-panel--open {
+  display: flex;
+}
+
+.llm-panel__label {
+  font-size: 0.85rem;
+  font-weight: 500;
+  color: var(--color-text-muted);
+}
+
+.llm-panel__textarea {
+  width: 100%;
+  padding: var(--space-2) var(--space-3);
+  background: var(--color-surface-1);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-sm);
+  color: var(--color-text);
+  font-size: 0.9rem;
+  resize: vertical;
+  font-family: inherit;
+}
+
+.llm-panel__textarea:focus {
+  outline: 2px solid var(--color-accent);
+  outline-offset: 1px;
+}
+
+.llm-panel__actions {
+  display: flex;
+  align-items: center;
+  gap: var(--space-3);
+  flex-wrap: wrap;
+}
+
+.llm-panel__build-btn {
+  padding: var(--space-2) var(--space-4);
+  background: var(--color-accent);
+  color: #fff;
+  border: none;
+  border-radius: var(--radius-sm);
+  font-weight: 600;
+  font-size: 0.875rem;
+  cursor: pointer;
+}
+
+.llm-panel__build-btn:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.llm-panel__status-pill {
+  font-size: 0.8rem;
+  color: var(--color-text-muted);
+}
+
+.llm-panel__status-pill--idle {
+  visibility: hidden;
+}
+
+.llm-panel__status-pill--done {
+  color: var(--color-success);
+}
+
+.llm-panel__status-pill--error {
+  color: var(--color-error);
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .llm-panel__spinner {
+    display: inline-block;
+    width: 0.75em;
+    height: 0.75em;
+    border: 2px solid var(--color-accent);
+    border-top-color: transparent;
+    border-radius: 50%;
+    animation: llm-spin 0.7s linear infinite;
+    vertical-align: middle;
+    margin-right: 0.25em;
+  }
+}
+
+@keyframes llm-spin {
+  to { transform: rotate(360deg); }
+}
+
+.llm-panel__error {
+  font-size: 0.85rem;
+  color: var(--color-error);
+  margin: 0;
+}
+
+.llm-panel__explanation {
+  font-size: 0.85rem;
+  color: var(--color-text-muted);
+  margin: 0;
+  font-style: italic;
+}
+
+.llm-panel__autorun {
+  display: flex;
+  align-items: center;
+  gap: var(--space-2);
+  font-size: 0.8rem;
+  color: var(--color-text-muted);
+  cursor: pointer;
+}
+</style>