diff --git a/image-studio/public/index.html b/image-studio/public/index.html
index 37a03f8..1e717b0 100644
--- a/image-studio/public/index.html
+++ b/image-studio/public/index.html
@@ -4,21 +4,24 @@
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
 <title>封面工作室 · 语言驱动排版设计</title>
-<meta name="description" content="输入文字，自动排版，生成封面。开源免费，无需GPU。">
+<meta name="description" content="输入文字，自动排版，生成封面。每一步意图透明，设计真正属于你。">
 <style>
 :root {
-  --bg: #0a0e27;
-  --surface: #111636;
-  --border: #1e2a4a;
+  --bg: #080d1a;
+  --surface: #0f1832;
+  --surface2: #141f40;
+  --border: #1a2a52;
+  --border-h: #2a3f72;
   --text: #c8d6e5;
-  --text-muted: #6b7d99;
+  --text-dim: #6b7d99;
   --accent: #4f8cff;
-  --accent-glow: #00d4ff;
-  --danger: #ff4757;
-  --success: #2ed573;
-  --radius: 12px;
+  --accent-dim: #3a6fd9;
+  --glow: #00d4ff;
+  --green: #2ed573;
+  --gold: #ffb347;
+  --radius: 14px;
+  --radius-sm: 10px;
 }
-
 * { margin: 0; padding: 0; box-sizing: border-box; }
 
 body {
@@ -27,583 +30,564 @@ body {
   font-family: -apple-system, 'PingFang SC', 'Noto Sans SC', sans-serif;
   min-height: 100vh;
   line-height: 1.6;
+  background-image:
+    radial-gradient(ellipse at 30% 20%, rgba(79,140,255,0.06) 0%, transparent 50%),
+    radial-gradient(ellipse at 70% 80%, rgba(0,212,255,0.04) 0%, transparent 50%);
 }
 
-/* ── Header ── */
+/* Header */
 .header {
   text-align: center;
-  padding: 48px 24px 32px;
+  padding: 56px 24px 36px;
+  position: relative;
+}
+.header::after {
+  content: '';
+  position: absolute;
+  bottom: 0;
+  left: 50%;
+  transform: translateX(-50%);
+  width: 60px;
+  height: 2px;
+  background: linear-gradient(90deg, transparent, var(--accent), transparent);
 }
-
 .header h1 {
-  font-size: 36px;
+  font-size: 40px;
   font-weight: 800;
-  background: linear-gradient(135deg, var(--accent), var(--accent-glow));
+  background: linear-gradient(135deg, var(--accent) 30%, var(--glow) 70%);
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
   background-clip: text;
+  letter-spacing: 4px;
+  margin-bottom: 10px;
+}
+.header .sub {
+  font-size: 15px;
+  color: var(--text-dim);
   letter-spacing: 2px;
-  margin-bottom: 8px;
 }
-
-.header .desc {
-  font-size: 16px;
-  color: var(--text-muted);
-}
-
 .header .badges {
-  margin-top: 16px;
+  margin-top: 18px;
   display: flex;
   gap: 10px;
   justify-content: center;
   flex-wrap: wrap;
 }
-
 .badge {
-  display: inline-block;
-  padding: 4px 14px;
+  padding: 5px 16px;
   font-size: 12px;
   border-radius: 20px;
   border: 1px solid var(--border);
-  color: var(--text-muted);
+  color: var(--text-dim);
   letter-spacing: 1px;
+  background: rgba(79,140,255,0.04);
+}
+.badge.highlight {
+  border-color: var(--green);
+  color: var(--green);
+  background: rgba(46,213,115,0.06);
 }
 
-/* ── Main Layout ── */
+/* Main grid */
 .main {
-  max-width: 1200px;
+  max-width: 1300px;
   margin: 0 auto;
-  padding: 0 24px 80px;
+  padding: 0 28px 100px;
   display: grid;
-  grid-template-columns: 1fr 1fr;
-  gap: 32px;
+  grid-template-columns: 480px 1fr;
+  gap: 36px;
+  align-items: start;
+}
+@media (max-width: 1000px) {
+  .main { grid-template-columns: 1fr; max-width: 600px; }
 }
 
-@media (max-width: 900px) {
-  .main {
-    grid-template-columns: 1fr;
-  }
-}
-
-/* ── Panel ── */
+/* Panel */
 .panel {
   background: var(--surface);
-  border-radius: var(--radius);
   border: 1px solid var(--border);
-  padding: 28px;
+  border-radius: var(--radius);
+  padding: 32px;
+  position: relative;
+  overflow: hidden;
+}
+.panel::before {
+  content: '';
+  position: absolute;
+  top: 0; left: 0;
+  width: 100%;
+  height: 1px;
+  background: linear-gradient(90deg, transparent, rgba(79,140,255,0.15), transparent);
 }
 
-.panel-title {
-  font-size: 14px;
+.panel-head {
+  font-size: 13px;
   font-weight: 700;
   text-transform: uppercase;
-  letter-spacing: 2px;
-  color: var(--text-muted);
-  margin-bottom: 20px;
+  letter-spacing: 3px;
+  color: var(--text-dim);
+  margin-bottom: 24px;
   display: flex;
   align-items: center;
-  gap: 8px;
+  gap: 10px;
 }
-
-.panel-title::before {
+.panel-head::before {
   content: '';
   display: block;
-  width: 4px;
-  height: 16px;
+  width: 3px;
+  height: 14px;
   background: var(--accent);
   border-radius: 2px;
 }
 
-/* ── Form ── */
-.form-group {
-  margin-bottom: 18px;
-}
-
-.form-group label {
+/* Form */
+.field { margin-bottom: 18px; }
+.field label {
   display: block;
-  font-size: 13px;
-  color: var(--text-muted);
-  margin-bottom: 6px;
-  letter-spacing: 1px;
+  font-size: 12px;
+  color: var(--text-dim);
+  margin-bottom: 7px;
+  letter-spacing: 1.5px;
+  font-weight: 500;
 }
-
-.form-group input,
-.form-group textarea,
-.form-group select {
+.field input, .field textarea, .field select {
   width: 100%;
-  padding: 12px 16px;
-  background: var(--bg);
+  padding: 14px 18px;
+  background: var(--surface2);
   border: 1px solid var(--border);
-  border-radius: 8px;
+  border-radius: var(--radius-sm);
   color: var(--text);
   font-size: 15px;
   font-family: inherit;
-  transition: border-color 0.2s;
-}
-
-.form-group input:focus,
-.form-group textarea:focus,
-.form-group select:focus {
+  transition: all 0.2s;
   outline: none;
+}
+.field input:focus, .field textarea:focus, .field select:focus {
   border-color: var(--accent);
-  box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.1);
+  box-shadow: 0 0 0 3px rgba(79,140,255,0.08);
 }
-
-.form-group textarea {
-  min-height: 180px;
+.field textarea {
+  min-height: 200px;
   resize: vertical;
-  line-height: 1.7;
+  line-height: 1.8;
 }
+.field textarea::placeholder, .field input::placeholder { color: rgba(107,125,153,0.4); }
+.field select { cursor: pointer; appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7d99' d='M6 8L1 3h10z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }
 
-.form-row {
-  display: grid;
-  grid-template-columns: 1fr 1fr;
-  gap: 12px;
-}
+.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
 
-/* ── Preset Selector ── */
-.preset-grid {
+/* Presets */
+.preset-row {
   display: grid;
   grid-template-columns: repeat(5, 1fr);
-  gap: 8px;
+  gap: 7px;
   margin-bottom: 18px;
 }
-
-.preset-btn {
-  padding: 10px 6px;
-  border: 2px solid transparent;
-  border-radius: 8px;
+.preset-dot {
+  padding: 10px 4px;
+  border: 2px solid var(--border);
+  border-radius: var(--radius-sm);
   cursor: pointer;
   text-align: center;
   font-size: 12px;
-  color: var(--text-muted);
-  background: var(--bg);
+  color: var(--text-dim);
+  background: var(--surface2);
   transition: all 0.2s;
   font-family: inherit;
 }
-
-.preset-btn:hover {
-  border-color: var(--border);
-  color: var(--text);
-}
-
-.preset-btn.active {
+.preset-dot:hover { border-color: var(--border-h); color: var(--text); }
+.preset-dot.active {
   border-color: var(--accent);
   color: var(--accent);
-  background: rgba(79, 140, 255, 0.08);
+  background: rgba(79,140,255,0.08);
 }
 
-/* ── Generate Button ── */
-.generate-btn {
+/* Generate btn */
+.gen-btn {
   width: 100%;
-  padding: 14px 24px;
-  background: linear-gradient(135deg, var(--accent), #3d6fd9);
+  padding: 16px 28px;
+  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
   color: #fff;
   border: none;
-  border-radius: 10px;
-  font-size: 16px;
+  border-radius: var(--radius-sm);
+  font-size: 17px;
   font-weight: 700;
   cursor: pointer;
   letter-spacing: 2px;
-  transition: all 0.2s;
+  transition: all 0.25s;
   font-family: inherit;
+  margin-top: 6px;
+  position: relative;
+  overflow: hidden;
 }
-
-.generate-btn:hover {
-  transform: translateY(-1px);
-  box-shadow: 0 8px 30px rgba(79, 140, 255, 0.3);
+.gen-btn::after {
+  content: '';
+  position: absolute;
+  top: 0; left: -100%;
+  width: 100%; height: 100%;
+  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
+  transition: left 0.5s;
 }
-
-.generate-btn:disabled {
-  opacity: 0.5;
-  cursor: not-allowed;
-  transform: none;
-  box-shadow: none;
+.gen-btn:hover::after { left: 100%; }
+.gen-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(79,140,255,0.25); }
+.gen-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }
+.gen-btn .spinner {
+  display: none; width: 18px; height: 18px;
+  border: 2px solid #fff; border-top-color: transparent;
+  border-radius: 50%; animation: spin 0.6s linear infinite;
+  margin-right: 10px; vertical-align: middle;
 }
-
-.generate-btn .spinner {
-  display: none;
-  width: 16px;
-  height: 16px;
-  border: 2px solid #fff;
-  border-top-color: transparent;
-  border-radius: 50%;
-  animation: spin 0.6s linear infinite;
-  margin-right: 8px;
-  vertical-align: middle;
-}
-
-.generate-btn.loading .spinner { display: inline-block; }
-.generate-btn.loading .btn-text { display: none; }
-
+.gen-btn.loading .spinner { display: inline-block; }
+.gen-btn.loading .txt { display: none; }
 @keyframes spin { to { transform: rotate(360deg); } }
 
-/* ── Preview ── */
-.preview-area {
+.error { display: none; padding: 12px 16px; background: rgba(255,71,87,0.08); border: 1px solid rgba(255,71,87,0.3); border-radius: var(--radius-sm); color: #ff6b7a; font-size: 13px; margin-top: 12px; }
+.error.show { display: block; }
+
+/* Preview area */
+.preview-wrap {
   display: flex;
   flex-direction: column;
   align-items: center;
+  min-height: 360px;
   justify-content: center;
-  min-height: 400px;
 }
-
-.preview-placeholder {
+.preview-empty {
   text-align: center;
-  color: var(--text-muted);
-  padding: 60px 20px;
-}
-
-.preview-placeholder .icon {
-  font-size: 64px;
-  margin-bottom: 16px;
-  opacity: 0.3;
-}
-
-.preview-placeholder .text {
-  font-size: 15px;
-  line-height: 1.8;
+  padding: 80px 40px;
 }
+.preview-empty .icon { font-size: 56px; margin-bottom: 18px; opacity: 0.25; }
+.preview-empty .hint { font-size: 15px; color: var(--text-dim); line-height: 2; }
 
 .preview-img {
   max-width: 100%;
-  max-height: 500px;
-  border-radius: 8px;
+  max-height: 520px;
+  border-radius: 10px;
   border: 1px solid var(--border);
   display: none;
+  box-shadow: 0 8px 40px rgba(0,0,0,0.4);
 }
-
 .preview-img.show { display: block; }
 
-/* ── Download Button ── */
-.download-bar {
-  display: none;
-  margin-top: 16px;
-  width: 100%;
-  text-align: center;
-}
+.loading-dots { display: none; gap: 8px; justify-content: center; padding: 80px 40px; }
+.loading-dots.show { display: flex; }
+.loading-dots span { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: dot 1.2s ease-in-out infinite; }
+.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
+.loading-dots span:nth-child(3) { animation-delay: 0.4s; }
+@keyframes dot { 0%,80%,100% { transform: scale(0.5); opacity: 0.2; } 40% { transform: scale(1); opacity: 1; } }
 
-.download-bar.show { display: block; }
-
-.download-btn {
+/* Download bar */
+.dl-bar { display: none; margin-top: 20px; width: 100%; text-align: center; }
+.dl-bar.show { display: block; }
+.dl-btn {
   display: inline-block;
-  padding: 10px 28px;
-  background: var(--surface);
+  padding: 12px 32px;
+  background: var(--surface2);
   color: var(--accent);
   border: 1px solid var(--accent);
-  border-radius: 8px;
+  border-radius: var(--radius-sm);
   text-decoration: none;
   font-size: 14px;
   font-weight: 600;
-  cursor: pointer;
   letter-spacing: 1px;
+  cursor: pointer;
   transition: all 0.2s;
 }
+.dl-btn:hover { background: rgba(79,140,255,0.1); }
 
-.download-btn:hover {
-  background: rgba(79, 140, 255, 0.1);
-}
-
-/* ── Loading ── */
-.loading-dots {
-  display: flex;
-  gap: 8px;
-  justify-content: center;
-  padding: 40px;
-}
-.loading-dots span {
-  width: 10px;
-  height: 10px;
-  border-radius: 50%;
-  background: var(--accent);
-  animation: dot 1.2s ease-in-out infinite;
-}
-.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
-.loading-dots span:nth-child(3) { animation-delay: 0.4s; }
-@keyframes dot { 0%,80%,100% { transform: scale(0.6); opacity: 0.3; } 40% { transform: scale(1); opacity: 1; } }
-
-/* ── Error ── */
-.error-msg {
+/* Intent Chain */
+.intent-chain {
+  margin-top: 28px;
   display: none;
-  padding: 12px 16px;
-  background: rgba(255, 71, 87, 0.1);
-  border: 1px solid var(--danger);
-  border-radius: 8px;
-  color: var(--danger);
-  font-size: 13px;
-  margin-top: 12px;
 }
-.error-msg.show { display: block; }
+.intent-chain.show { display: block; }
 
-/* ── Footer ── */
+.intent-chain .title {
+  font-size: 13px;
+  font-weight: 700;
+  letter-spacing: 3px;
+  color: var(--text-dim);
+  text-transform: uppercase;
+  margin-bottom: 18px;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+.intent-chain .title::before {
+  content: '';
+  display: block;
+  width: 3px;
+  height: 14px;
+  background: var(--green);
+  border-radius: 2px;
+}
+
+.step-card {
+  display: flex;
+  gap: 14px;
+  padding: 14px 0;
+  position: relative;
+}
+.step-card:not(:last-child)::after {
+  content: '';
+  position: absolute;
+  left: 17px;
+  top: 46px;
+  width: 1px;
+  height: calc(100% - 32px);
+  background: linear-gradient(to bottom, var(--border), transparent);
+}
+
+.step-icon {
+  width: 36px;
+  height: 36px;
+  border-radius: 50%;
+  background: var(--surface2);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 16px;
+  flex-shrink: 0;
+  border: 1px solid var(--border);
+}
+.step-icon.user { border-color: var(--green); background: rgba(46,213,115,0.06); }
+.step-icon.system { border-color: var(--accent); background: rgba(79,140,255,0.04); }
+
+.step-body { flex: 1; min-width: 0; }
+.step-body .step-who { font-size: 11px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 4px; }
+.step-body .step-who.user { color: var(--green); }
+.step-body .step-who.system { color: var(--accent); }
+.step-body .step-label { font-size: 14px; font-weight: 600; color: var(--text); margin-bottom: 4px; }
+.step-body .step-detail { font-size: 13px; color: var(--text-dim); line-height: 1.6; }
+.step-body .step-why { font-size: 12px; color: rgba(107,125,153,0.5); margin-top: 4px; font-style: italic; }
+
+/* Signature */
+.signature {
+  text-align: center;
+  padding: 24px 0 0;
+  font-size: 14px;
+  color: var(--green);
+  letter-spacing: 2px;
+  font-weight: 600;
+  display: none;
+}
+.signature.show { display: block; }
+
+/* Footer */
 .footer {
   text-align: center;
-  padding: 32px 24px;
+  padding: 40px 24px;
   font-size: 13px;
-  color: var(--text-muted);
-  opacity: 0.5;
-  letter-spacing: 1px;
-}
-
-.footer a {
-  color: var(--accent);
-  text-decoration: none;
-}
-
-.footer .divider {
-  margin: 0 8px;
-  opacity: 0.3;
+  color: var(--text-dim);
+  opacity: 0.4;
+  letter-spacing: 2px;
 }
+.footer a { color: var(--accent); text-decoration: none; }
+.footer .sep { margin: 0 10px; opacity: 0.3; }
 </style>
 </head>
 <body>
 
 <header class="header">
   <h1>封面工作室</h1>
-  <p class="desc">语言驱动排版设计 · 输入文字，自动生成封面</p>
+  <p class="sub">语言驱动排版设计 · 输入文字，自动生成封面</p>
   <div class="badges">
-    <span class="badge">开源免费</span>
-    <span class="badge">无需GPU</span>
-    <span class="badge">一键部署</span>
-    <span class="badge">MIT协议</span>
+    <span class="badge highlight">开源免费</span>
+    <span class="badge">无需 GPU</span>
+    <span class="badge">意图透明</span>
+    <span class="badge">设计属于你</span>
   </div>
 </header>
 
 <div class="main">
 
   <!-- 左侧：输入面板 -->
-  <div class="panel" id="inputPanel">
-    <div class="panel-title">📝 内容输入</div>
+  <div class="panel" id="formPanel">
+    <div class="panel-head">内容输入</div>
 
-    <div class="form-group">
-      <label for="templateSelect">模板</label>
-      <select id="templateSelect"></select>
+    <div class="field">
+      <label for="tpl">模板</label>
+      <select id="tpl"></select>
     </div>
 
-    <div class="form-group">
-      <label>预设风格</label>
-      <div class="preset-grid" id="presetGrid"></div>
+    <div class="field">
+      <label>风格预设</label>
+      <div class="preset-row" id="presets"></div>
     </div>
 
-    <div class="form-row">
-      <div class="form-group">
-        <label for="layoutSelect">布局</label>
-        <select id="layoutSelect">
+    <div class="row2">
+      <div class="field">
+        <label for="layout">布局</label>
+        <select id="layout">
           <option value="default">标准排版</option>
           <option value="hero">大标题封面</option>
           <option value="quote">金句居中</option>
         </select>
       </div>
-      <div class="form-group">
-        <label for="tagInput">标签（可选）</label>
-        <input type="text" id="tagInput" placeholder="例如：教程 · 干货">
+      <div class="field">
+        <label for="tag">标签</label>
+        <input type="text" id="tag" placeholder="教程 · 干货" maxlength="20">
       </div>
     </div>
 
-    <div class="form-group">
-      <label for="titleInput">标题</label>
-      <input type="text" id="titleInput" placeholder="标题将作为封面大标题">
+    <div class="field">
+      <label for="title">标题</label>
+      <input type="text" id="title" placeholder="标题将作为封面大标题" maxlength="60">
     </div>
 
-    <div class="form-group">
-      <label for="bodyInput">正文（支持 Markdown 列表和加粗）</label>
-      <textarea id="bodyInput" placeholder="输入正文内容...&#10;&#10;支持格式：&#10;- 列表项用 - 或 • 开头&#10;## 小标题用 ## 开头&#10;**加粗文字** 用双星号包裹&#10;&#10;无需GPU · 语言驱动排版 · 开源免费&#10;一行命令部署到你的服务器&#10;支持多种风格和模板"></textarea>
+    <div class="field">
+      <label for="body">正文（支持 Markdown）</label>
+      <textarea id="body" placeholder="输入正文…&#10;&#10;- 列表用 - 开头&#10;## 小标题用 ## 开头&#10;**加粗** 用双星号&#10;&#10;语言驱动排版 · 零成本 · 无需GPU"></textarea>
     </div>
 
-    <button class="generate-btn" id="genBtn" onclick="doGenerate()">
+    <button class="gen-btn" id="genBtn" onclick="go()">
       <span class="spinner"></span>
-      <span class="btn-text">⚡ 生成封面</span>
+      <span class="txt">生成封面</span>
     </button>
-
-    <div class="error-msg" id="errorMsg"></div>
+    <div class="error" id="err"></div>
   </div>
 
-  <!-- 右侧：预览面板 -->
-  <div class="panel" id="previewPanel">
-    <div class="panel-title">👁️ 预览</div>
-    <div class="preview-area" id="previewArea">
-      <div class="preview-placeholder" id="placeholder">
-        <div class="icon">🎨</div>
-        <div class="text">
-          在左侧输入内容<br>
-          选择模板和风格<br>
-          点击「生成封面」
+  <!-- 右侧：预览 + 意图链 -->
+  <div>
+    <div class="panel" id="previewPanel">
+      <div class="panel-head">预览</div>
+      <div class="preview-wrap">
+        <div class="preview-empty" id="empty">
+          <div class="icon">🎨</div>
+          <div class="hint">输入文字 · 选择风格<br>点击生成</div>
         </div>
+        <div class="loading-dots" id="loading"><span></span><span></span><span></span></div>
+        <img class="preview-img" id="preview" alt="封面预览">
+        <div class="dl-bar" id="dlBar">
+          <a class="dl-btn" id="dlLink" href="#" download>下载 PNG</a>
+        </div>
+        <div class="signature" id="sig">✨ 设计属于你 · 系统只是你的手</div>
       </div>
-      <div class="loading-dots" id="loadingDots" style="display:none">
-        <span></span><span></span><span></span>
-      </div>
-      <img class="preview-img" id="previewImg" alt="封面预览">
-      <div class="download-bar" id="downloadBar">
-        <a class="download-btn" id="downloadLink" href="#" download>💾 下载封面 (PNG)</a>
-      </div>
+    </div>
+
+    <div class="panel intent-chain" id="chain">
+      <div class="title">意图链 · 设计你的</div>
+      <div id="chainBody"></div>
     </div>
   </div>
 
 </div>
 
 <footer class="footer">
-  <span>铸渊封面工作室 v2.0</span>
-  <span class="divider">·</span>
-  <span>开源协议 <a href="#" target="_blank">MIT</a></span>
-  <span class="divider">·</span>
-  <span>代码仓库 <a href="https://guanghulab.com/code/bingshuo/guanghulab" target="_blank">guanghulab.com</a></span>
+  铸渊封面工作室 v2.1
+  <span class="sep">·</span>
+  <a href="https://guanghulab.com/code/bingshuo/guanghulab" target="_blank">开源仓库</a>
+  <span class="sep">·</span>
+  MIT
 </footer>
 
 <script>
-// ── State ──
-let templates = []
-let currentTemplate = null
-let currentPreset = 'tech'
-let currentLayout = 'default'
+let tpls = [], curTpl = null, curPreset = 'tech'
 
-// ── Init ──
 async function init() {
   try {
-    const res = await fetch('/api/templates')
-    templates = await res.json()
-    renderTemplateSelect()
-    selectTemplate(templates[0]?.id)
+    const r = await fetch('/api/templates')
+    tpls = await r.json()
+    const sel = document.getElementById('tpl')
+    sel.innerHTML = tpls.map(t => `<option value="${t.id}">${t.icon} ${t.name}</option>`).join('')
+    sel.onchange = () => pick(sel.value)
+    pick(tpls[0]?.id)
 
-    // 快速填充示例内容
-    document.getElementById('titleInput').value = '零基础手搓AI封面生成器'
-    document.getElementById('bodyInput').value =
-      '不需要GPU · 不花一分钱 · 语言驱动自动排版\n\n' +
-      '- **零成本** 纯 HTML/CSS 排版渲染，无需 AI 绘画模型\n' +
-      '- **极轻量** 2GB 内存就能跑，一行命令部署\n' +
-      '- **语言驱动** 输入文字，自动分析内容类型和情绪，推荐配色和布局\n' +
-      '- **开源免费** MIT 协议，代码完全公开\n' +
-      '- **可扩展** 模板注册表机制，新增模板零改动核心代码'
+    document.getElementById('title').value = '零基础手搓AI封面生成器'
+    document.getElementById('body').value =
+      '语言驱动排版 · 意图透明 · 设计属于你\n\n' +
+      '- 零成本 纯 HTML/CSS 排版渲染\n' +
+      '- 极轻量 2GB 内存一行命令部署\n' +
+      '- 语言驱动 输入文字自动分析推荐\n' +
+      '- 意图透明 每一步推理可见\n' +
+      '- 设计属于你 署名 @冰朔'
   } catch (e) {
-    console.error('加载模板失败:', e)
-    showError('无法加载模板列表，请检查服务器连接')
+    console.error(e)
+    document.getElementById('err').textContent = '连接服务器失败'
+    document.getElementById('err').classList.add('show')
   }
 }
 
-function renderTemplateSelect() {
-  const sel = document.getElementById('templateSelect')
-  sel.innerHTML = templates.map(t =>
-    `<option value="${t.id}">${t.icon} ${t.name} — ${t.description}</option>`
-  ).join('')
-  sel.onchange = () => selectTemplate(sel.value)
-}
-
-function selectTemplate(id) {
-  currentTemplate = templates.find(t => t.id === id)
-  if (!currentTemplate) return
-  currentPreset = currentTemplate.presets?.[0]?.id || 'tech'
-  renderPresets()
-  document.getElementById('templateSelect').value = id
-}
-
-function renderPresets() {
-  const grid = document.getElementById('presetGrid')
-  const presets = currentTemplate?.presets || []
-  grid.innerHTML = presets.map(p =>
-    `<button class="preset-btn ${p.id === currentPreset ? 'active' : ''}"
-       onclick="selectPreset('${p.id}')">${p.name}</button>`
+function pick(id) {
+  curTpl = tpls.find(t => t.id === id)
+  curPreset = curTpl?.presets?.[0]?.id || 'tech'
+  document.getElementById('presets').innerHTML = (curTpl?.presets || []).map(p =>
+    `<button class="preset-dot ${p.id === curPreset ? 'active' : ''}" onclick="setPreset('${p.id}')">${p.name}</button>`
   ).join('')
 }
 
-function selectPreset(id) {
-  currentPreset = id
-  renderPresets()
-}
+function setPreset(id) { curPreset = id; pick(curTpl.id) }
 
-// ── Generate ──
-async function doGenerate() {
-  const title = document.getElementById('titleInput').value.trim()
-  const body = document.getElementById('bodyInput').value.trim()
-  const tag = document.getElementById('tagInput').value.trim()
-  const layout = document.getElementById('layoutSelect').value
+async function go() {
+  const title = document.getElementById('title').value.trim()
+  const body = document.getElementById('body').value.trim()
+  const tag = document.getElementById('tag').value.trim()
+  const layout = document.getElementById('layout').value
 
   if (!title && !body) {
-    showError('请至少输入标题或正文内容')
+    const e = document.getElementById('err'); e.textContent = '请输入标题或正文'; e.classList.add('show')
     return
   }
 
-  setLoading(true)
-  hideError()
+  document.getElementById('err').classList.remove('show')
+  document.getElementById('empty').style.display = 'none'
+  document.getElementById('preview').classList.remove('show')
+  document.getElementById('dlBar').classList.remove('show')
+  document.getElementById('sig').classList.remove('show')
+  document.getElementById('chain').classList.remove('show')
+  document.getElementById('loading').classList.add('show')
+  document.getElementById('genBtn').classList.add('loading')
+  document.getElementById('genBtn').disabled = true
 
   try {
-    const res = await fetch('/api/generate', {
+    const r = await fetch('/api/generate', {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({
-        templateId: currentTemplate?.id,
-        presetId: currentPreset,
-        title,
-        body,
-        tag,
-        layout,
-      }),
+      body: JSON.stringify({ templateId: curTpl?.id, presetId: curPreset, title, body, tag, layout }),
     })
+    if (!r.ok) { const e = await r.json(); throw new Error(e.error || '生成失败') }
+    const d = await r.json()
 
-    if (!res.ok) {
-      const err = await res.json()
-      throw new Error(err.error || '生成失败')
+    document.getElementById('loading').classList.remove('show')
+    document.getElementById('empty').style.display = 'none'
+    const img = document.getElementById('preview')
+    img.src = d.url
+    img.classList.add('show')
+    document.getElementById('dlBar').classList.add('show')
+    document.getElementById('dlLink').href = d.url
+    document.getElementById('sig').classList.add('show')
+
+    // 意图链
+    if (d.intent_chain) {
+      document.getElementById('chain').classList.add('show')
+      document.getElementById('chainBody').innerHTML = d.intent_chain.map(s =>
+        `<div class="step-card">
+          <div class="step-icon ${s.who === '用户' ? 'user' : 'system'}">${s.icon}</div>
+          <div class="step-body">
+            <div class="step-who ${s.who === '用户' ? 'user' : 'system'}">${s.who}</div>
+            <div class="step-label">${s.step}</div>
+            <div class="step-detail">${s.detail}</div>
+            ${s.why ? `<div class="step-why">→ ${s.why}</div>` : ''}
+          </div>
+        </div>`
+      ).join('')
     }
-
-    const data = await res.json()
-    showPreview(data.url || data.urls[0])
   } catch (e) {
-    showError(e.message || '生成失败，请稍后重试')
-    setLoading(false)
+    document.getElementById('loading').classList.remove('show')
+    document.getElementById('empty').style.display = 'block'
+    const err = document.getElementById('err')
+    err.textContent = e.message
+    err.classList.add('show')
+  } finally {
+    document.getElementById('genBtn').classList.remove('loading')
+    document.getElementById('genBtn').disabled = false
   }
 }
 
-function setLoading(loading) {
-  const btn = document.getElementById('genBtn')
-  const dots = document.getElementById('loadingDots')
-  const placeholder = document.getElementById('placeholder')
-  const img = document.getElementById('previewImg')
-  const bar = document.getElementById('downloadBar')
-
-  if (loading) {
-    btn.classList.add('loading')
-    btn.disabled = true
-    placeholder.style.display = 'none'
-    img.classList.remove('show')
-    bar.classList.remove('show')
-    dots.style.display = 'flex'
-  } else {
-    btn.classList.remove('loading')
-    btn.disabled = false
-    dots.style.display = 'none'
-  }
-}
-
-function showPreview(url) {
-  setLoading(false)
-  const placeholder = document.getElementById('placeholder')
-  const img = document.getElementById('previewImg')
-  const bar = document.getElementById('downloadBar')
-  const link = document.getElementById('downloadLink')
-
-  placeholder.style.display = 'none'
-  img.src = url
-  img.classList.add('show')
-  bar.classList.add('show')
-  link.href = url
-}
-
-function showError(msg) {
-  const el = document.getElementById('errorMsg')
-  el.textContent = msg
-  el.classList.add('show')
-}
-
-function hideError() {
-  document.getElementById('errorMsg').classList.remove('show')
-}
-
-// ── Keyboard shortcut ──
-document.addEventListener('keydown', (e) => {
-  if ((e.metaKey || e.ctrlKey) && e.key === 'Enter') {
-    doGenerate()
-  }
+document.addEventListener('keydown', e => {
+  if ((e.metaKey || e.ctrlKey) && e.key === 'Enter') go()
 })
 
-// ── Start ──
 init()
 </script>
 </body>