style: tighten detail mode layout spacing

components/canvas/CanvasChatPanel.tsx

@@ -367,6 +367,23 @@ const DETAIL_SLOT_CONFIGS: DetailSlotConfig[] = [
   { key: "product-5", label: "产品图5", role: "product" },
   { key: "model-1", label: "模特图", role: "model" },
 ];
+const DETAIL_FIELD_EXAMPLES: Record<keyof DetailBriefForm, string> = {
+  productName: "示例：Buyi-AI 无线手持吸尘器",
+  targetAudience: "示例：25-40岁养宠家庭、宝妈",
+  mainUser: "示例：家庭主理人、租房上班族",
+  usageScenario: "示例：下班回家10分钟快速清洁",
+  triggerMoment: "示例：宠物掉毛高峰、饭后碎屑清理",
+  coreNeed: "示例：省时省力清除毛发与灰尘",
+  riskConcern: "示例：担心吸力不足、续航短、噪音大",
+  expectedResult: "示例：3分钟清洁桌面，地面无明显毛发",
+  coreSellingPoint: "示例：18000Pa吸力、0.9kg轻量、一键倒尘",
+  positioningStatement: "示例：让日常清洁更快更轻松",
+  userVoice: "示例：家里有猫掉毛太多，希望安静一点不吵宝宝",
+  competitorReference: "示例：对标戴森入门款，突出轻便高性价比",
+  priceBand: "示例：199-299元",
+  brandTone: "示例：专业、可靠、亲和",
+  bannedWords: "示例：最强、第一、100%治愈",
+};
 
 const SESSION_TITLE_MAX_LEN = 18;
 
@@ -2969,12 +2986,17 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
       </div>
       
       {/* 消息列表 */}
-      <ScrollArea className="flex-1 p-4 pt-16">
+      <ScrollArea
+        className={cn(
+          "flex-1 p-4",
+          isDetailGenerationMode && messages.length === 0 ? "pt-10" : "pt-16"
+        )}
+      >
         <div className="space-y-6">
           {messages.length === 0 && (
-            <div className="flex flex-col h-full pt-4">
+            <div className={cn("flex flex-col h-full", isDetailGenerationMode ? "pt-0" : "pt-4")}>
               {/* Greeting */}
-              <div className="mb-8">
+              <div className={cn(isDetailGenerationMode ? "mb-4" : "mb-8")}>
                 <h1 className="text-2xl font-bold mb-2">Hi, 我是你的AI设计师</h1>
                 <p className="text-muted-foreground">让我们开始今天的创作吧!</p>
               </div>
@@ -3274,7 +3296,12 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
           data-canvas-chat-input-anchor="true"
         >
           {isDetailGenerationMode && (
-            <div className="mx-3 mt-3 max-h-[54vh] overflow-y-auto rounded-2xl border border-black/10 bg-white/95 p-3 pr-2">
+            <div
+              className={cn(
+                "mx-3 mt-3 overflow-y-auto rounded-2xl border border-black/10 bg-white/95 p-3 pr-2",
+                messages.length === 0 ? "max-h-[62vh]" : "max-h-[54vh]"
+              )}
+            >
               <div className="flex items-start justify-between gap-3">
                 <div>
                   <p className="text-sm font-semibold text-black">
@@ -3286,7 +3313,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
                 </div>
                 <span
                   className={cn(
-                    "rounded-full px-2 py-0.5 text-[10px] font-medium",
+                    "shrink-0 whitespace-nowrap rounded-full px-2 py-0.5 text-[10px] font-medium leading-none",
                     detailProgress.status === "running"
                       ? "bg-blue-50 text-blue-700"
                       : detailProgress.status === "done"
@@ -3329,6 +3356,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
               </div>
 
               <div className="mt-3 space-y-2">
+                <p className="px-1 text-[11px] text-black/45">提示：鼠标悬停输入框可查看填写示例。</p>
                 <div className="rounded-xl border border-black/10 bg-white">
                   <button
                     type="button"
@@ -3351,60 +3379,70 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
                       <input
                         value={detailBrief.targetAudience}
                         onChange={(event) => updateDetailBriefField("targetAudience", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.targetAudience}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400"
                         placeholder="主购买人群 *"
                       />
                       <input
                         value={detailBrief.usageScenario}
                         onChange={(event) => updateDetailBriefField("usageScenario", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.usageScenario}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400"
                         placeholder="需求场景 *"
                       />
                       <input
                         value={detailBrief.coreNeed}
                         onChange={(event) => updateDetailBriefField("coreNeed", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.coreNeed}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400"
                         placeholder="核心需求 *"
                       />
                       <input
                         value={detailBrief.productName}
                         onChange={(event) => updateDetailBriefField("productName", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.productName}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400"
                         placeholder="产品名称（选填）"
                       />
                       <input
                         value={detailBrief.mainUser}
                         onChange={(event) => updateDetailBriefField("mainUser", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.mainUser}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400"
                         placeholder="主使用者（选填）"
                       />
                       <input
                         value={detailBrief.triggerMoment}
                         onChange={(event) => updateDetailBriefField("triggerMoment", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.triggerMoment}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400"
                         placeholder="触发时刻（选填）"
                       />
                       <input
                         value={detailBrief.riskConcern}
                         onChange={(event) => updateDetailBriefField("riskConcern", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.riskConcern}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400"
                         placeholder="用户顾虑（选填）"
                       />
                       <input
                         value={detailBrief.expectedResult}
                         onChange={(event) => updateDetailBriefField("expectedResult", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.expectedResult}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400"
                         placeholder="期望结果（选填）"
                       />
                       <input
                         value={detailBrief.coreSellingPoint}
                         onChange={(event) => updateDetailBriefField("coreSellingPoint", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.coreSellingPoint}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400 xl:col-span-2"
                         placeholder="核心卖点关键词（选填）"
                       />
                       <input
                         value={detailBrief.positioningStatement}
                         onChange={(event) => updateDetailBriefField("positioningStatement", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.positioningStatement}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400 xl:col-span-2"
                         placeholder="一句话定位（选填）"
                       />
@@ -3434,30 +3472,35 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
                       <input
                         value={detailBrief.priceBand}
                         onChange={(event) => updateDetailBriefField("priceBand", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.priceBand}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400"
                         placeholder="价格带（选填）"
                       />
                       <input
                         value={detailBrief.brandTone}
                         onChange={(event) => updateDetailBriefField("brandTone", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.brandTone}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400"
                         placeholder="品牌语气（选填）"
                       />
                       <input
                         value={detailBrief.competitorReference}
                         onChange={(event) => updateDetailBriefField("competitorReference", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.competitorReference}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400 xl:col-span-2"
                         placeholder="竞品对标（选填）"
                       />
                       <input
                         value={detailBrief.bannedWords}
                         onChange={(event) => updateDetailBriefField("bannedWords", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.bannedWords}
                         className="h-8 rounded-lg border border-black/15 bg-white px-2 text-xs outline-none focus:border-blue-400 xl:col-span-2"
                         placeholder="禁用表达（选填，逗号分隔）"
                       />
                       <textarea
                         value={detailBrief.userVoice}
                         onChange={(event) => updateDetailBriefField("userVoice", event.target.value)}
+                        title={DETAIL_FIELD_EXAMPLES.userVoice}
                         className="min-h-[64px] resize-y rounded-lg border border-black/15 bg-white px-2 py-1.5 text-xs outline-none focus:border-blue-400 xl:col-span-4"
                         placeholder="用户原话样本（选填，建议3-5条）"
                       />
@@ -3589,7 +3632,10 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
           )}
           {/* 混合输入区域：使用 contenteditable 实现真正的混合编辑 */}
           <div
-            className="relative px-4 pt-3 pb-12 min-h-[60px]"
+            className={cn(
+              "relative px-4 pt-3 pb-12",
+              isDetailGenerationMode ? "min-h-[72px]" : "min-h-[60px]"
+            )}
           >
             <div
               ref={textareaRef as any}