Fix hint visibility and add PWA install button with one-click prompt.

Co-authored-by: Cursor <cursoragent@cursor.com>

app.py

@@ -193,14 +193,99 @@ PWA_HEAD = """
 <link rel="icon" href="/pwa/icons/icon.svg" type="image/svg+xml">
 <link rel="apple-touch-icon" href="/pwa/icons/icon.svg">
 <script>
-if ("serviceWorker" in navigator) {
-  window.addEventListener("load", function () {
-    navigator.serviceWorker.register("/sw.js", { scope: "/" }).catch(function () {});
+(function () {
+  var deferredPrompt = null;
+
+  if ("serviceWorker" in navigator) {
+    window.addEventListener("load", function () {
+      navigator.serviceWorker.register("/sw.js", { scope: "/" }).catch(function () {});
+    });
+  }
+
+  function isStandalone() {
+    return window.matchMedia("(display-mode: standalone)").matches || window.navigator.standalone === true;
+  }
+
+  function isIOS() {
+    return /iPad|iPhone|iPod/.test(navigator.userAgent) || (navigator.platform === "MacIntel" && navigator.maxTouchPoints > 1);
+  }
+
+  function closeModal() {
+    var m = document.getElementById("pwa-install-modal");
+    if (m) m.remove();
+  }
+
+  function showModal(html) {
+    closeModal();
+    var overlay = document.createElement("div");
+    overlay.id = "pwa-install-modal";
+    overlay.className = "pwa-modal-overlay";
+    overlay.innerHTML = '<div class="pwa-modal">' + html + '</div>';
+    overlay.addEventListener("click", function (e) {
+      if (e.target === overlay || e.target.classList.contains("pwa-modal-close")) closeModal();
+    });
+    document.body.appendChild(overlay);
+  }
+
+  function manualInstallGuide() {
+    var steps = isIOS()
+      ? "<ol><li>点击 Safari 底部分享按钮 <strong>□↑</strong></li><li>选择 <strong>「添加到主屏幕」</strong></li><li>点击 <strong>添加</strong> 即可</li></ol>"
+      : "<ol><li>点击浏览器右上角 <strong>⋮</strong> 菜单</li><li>选择 <strong>「安装应用」</strong> 或 <strong>「添加到主屏幕」</strong></li><li>确认安装即可</li></ol>";
+    showModal(
+      '<button class="pwa-modal-close" type="button">✕</button>' +
+      '<h3>📲 安装 Trading Studio</h3>' +
+      '<p>当前环境需手动安装，按以下步骤操作：</p>' + steps +
+      '<p class="pwa-modal-tip">安装后可像原生 App 一样从桌面/icon 启动。</p>'
+    );
+  }
+
+  window.addEventListener("beforeinstallprompt", function (e) {
+    e.preventDefault();
+    deferredPrompt = e;
+    var btn = document.getElementById("pwa-install-btn");
+    if (btn) btn.classList.add("pwa-ready");
   });
-}
+
+  window.addEventListener("appinstalled", function () {
+    deferredPrompt = null;
+    var btn = document.getElementById("pwa-install-btn");
+    if (btn) btn.style.display = "none";
+  });
+
+  document.addEventListener("click", function (e) {
+    var btn = e.target.closest("#pwa-install-btn");
+    if (!btn) return;
+    e.preventDefault();
+    if (deferredPrompt) {
+      deferredPrompt.prompt();
+      deferredPrompt.userChoice.then(function (choice) {
+        if (choice.outcome === "accepted") btn.style.display = "none";
+        deferredPrompt = null;
+      });
+    } else {
+      manualInstallGuide();
+    }
+  });
+
+  window.addEventListener("load", function () {
+    var btn = document.getElementById("pwa-install-btn");
+    if (!btn || isStandalone()) {
+      if (btn) btn.style.display = "none";
+      return;
+    }
+    btn.style.display = "inline-flex";
+  });
+})();
 </script>
 """
 
+INSTALL_APP_BUTTON_HTML = """
+<button id="pwa-install-btn" class="pwa-install-btn" type="button" title="安装到手机/平板/电脑桌面">
+  <img src="/pwa/icons/install.svg" alt="" class="pwa-install-icon" width="28" height="28"/>
+  <span class="pwa-install-text">安装 App</span>
+</button>
+"""
+
 CUSTOM_CSS = """
 /* ========== 居中布局 + 响应式 + 高对比度 ========== */
 html, body {
@@ -348,10 +433,168 @@ gradio-app,
     line-height: 1.6 !important;
 }
 
+/* placeholder 高对比度 */
 .gradio-container textarea::placeholder,
-.gradio-container input::placeholder {
-    color: #9ca3af !important;
+.gradio-container input::placeholder,
+.gradio-container input[type="text"]::placeholder {
+    color: #d1d5db !important;
     opacity: 1 !important;
+    -webkit-text-fill-color: #d1d5db !important;
+}
+.gradio-container .bright-input textarea,
+.gradio-container .bright-input input {
+    background: #1e293b !important;
+    border: 1px solid #64748b !important;
+}
+
+/* 输入框下方 info 提示文字 */
+.gradio-container .hint,
+.gradio-container .info,
+.gradio-container .form .secondary-wrap,
+.gradio-container span[data-testid="block-info"] {
+    color: #94a3b8 !important;
+    font-size: 0.88rem !important;
+}
+
+/* Markdown 内联代码 — 修复白底看不见 */
+.gradio-container code,
+.gradio-container .prose code,
+.gradio-container .markdown-text code,
+.gradio-container pre code {
+    background: #1e3a5f !important;
+    color: #bfdbfe !important;
+    border: 1px solid #3b82f6 !important;
+    padding: 2px 10px !important;
+    border-radius: 6px !important;
+    font-size: 0.9em !important;
+}
+.gradio-container pre {
+    background: #111827 !important;
+    border: 1px solid #374151 !important;
+    padding: 12px !important;
+    border-radius: 8px !important;
+}
+
+/* 组件标签 — 修复白底蓝字 */
+.gradio-container .block-label,
+.gradio-container .label-wrap,
+.gradio-container .label-wrap span,
+.gradio-container span.label {
+    background: #1e293b !important;
+    background-color: #1e293b !important;
+    color: #93c5fd !important;
+    font-weight: 600 !important;
+    font-size: 0.95rem !important;
+    border: 1px solid #475569 !important;
+    border-radius: 6px !important;
+    padding: 4px 10px !important;
+}
+
+/* 说明文字块 */
+.hint-box {
+    background: #1e293b !important;
+    border: 1px solid #475569 !important;
+    border-radius: 10px !important;
+    padding: 14px 18px !important;
+    color: #e2e8f0 !important;
+    font-size: 0.95rem !important;
+    line-height: 1.7 !important;
+    margin-bottom: 12px !important;
+}
+.hint-box strong { color: #ffffff !important; }
+.file-tag {
+    display: inline-block;
+    background: #1e3a5f !important;
+    color: #bfdbfe !important;
+    border: 1px solid #3b82f6 !important;
+    padding: 3px 12px !important;
+    border-radius: 6px !important;
+    font-family: "JetBrains Mono", Consolas, monospace !important;
+    font-weight: 700 !important;
+    font-size: 0.92em !important;
+}
+
+/* 页头 + 安装 App 按钮 */
+.header-row {
+    align-items: flex-start !important;
+    width: 100% !important;
+}
+.header-row > div { flex: 1 1 auto !important; }
+.pwa-install-btn {
+    display: none;
+    align-items: center;
+    gap: 10px;
+    padding: 12px 20px;
+    margin-top: 8px;
+    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
+    color: #ffffff !important;
+    border: 2px solid #60a5fa;
+    border-radius: 12px;
+    cursor: pointer;
+    font-weight: 700;
+    font-size: 1rem;
+    font-family: inherit;
+    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.45);
+    transition: transform 0.15s, box-shadow 0.15s;
+    white-space: nowrap;
+}
+.pwa-install-btn:hover {
+    transform: translateY(-1px);
+    box-shadow: 0 6px 24px rgba(37, 99, 235, 0.55);
+}
+.pwa-install-btn.pwa-ready {
+    animation: pwa-pulse 2s infinite;
+}
+@keyframes pwa-pulse {
+    0%, 100% { box-shadow: 0 4px 20px rgba(37, 99, 235, 0.45); }
+    50% { box-shadow: 0 4px 28px rgba(96, 165, 250, 0.8); }
+}
+.pwa-install-icon { flex-shrink: 0; border-radius: 6px; }
+.pwa-install-text { color: #ffffff !important; }
+
+/* 安装引导弹窗 */
+.pwa-modal-overlay {
+    position: fixed;
+    inset: 0;
+    z-index: 99999;
+    background: rgba(0, 0, 0, 0.75);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 20px;
+}
+.pwa-modal {
+    position: relative;
+    background: #1e293b;
+    border: 2px solid #3b82f6;
+    border-radius: 16px;
+    padding: 28px 32px;
+    max-width: 420px;
+    width: 100%;
+    color: #e2e8f0;
+    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
+}
+.pwa-modal h3 { color: #ffffff !important; margin: 0 0 12px !important; font-size: 1.25rem !important; }
+.pwa-modal p { color: #cbd5e1 !important; line-height: 1.6 !important; }
+.pwa-modal ol { color: #e2e8f0 !important; padding-left: 20px !important; line-height: 1.8 !important; }
+.pwa-modal-tip { font-size: 0.85rem !important; color: #93c5fd !important; margin-top: 16px !important; }
+.pwa-modal-close {
+    position: absolute;
+    top: 12px;
+    right: 14px;
+    background: #374151;
+    border: none;
+    color: #fff;
+    width: 32px;
+    height: 32px;
+    border-radius: 8px;
+    cursor: pointer;
+    font-size: 1rem;
+}
+
+@media (max-width: 640px) {
+    .header-row { flex-direction: column !important; }
+    .pwa-install-btn { width: 100% !important; justify-content: center !important; margin-top: 12px !important; }
 }
 
 .gradio-container .wrap .readonly textarea {
@@ -512,8 +755,9 @@ def build_app() -> gr.Blocks:
     with gr.Blocks(
         title="Trading Studio | 交易复盘配音中控",
     ) as demo:
-        gr.Markdown(
-            f"""
+        with gr.Row(elem_classes=["header-row"]):
+            gr.Markdown(
+                f"""
 # ⚡ Trading Studio
 
 **本地量化交易复盘 → B 站配音生产流水线**
@@ -525,11 +769,10 @@ def build_app() -> gr.Blocks:
 | ChatTTS | 本地 GPU 固定音色合成 |
 
 > 仓库: [{GIT_REPO_URL}]({GIT_REPO_URL})
-
-<div class="install-hint">📱 <strong>安装为 App：</strong>手机/平板用浏览器菜单「添加到主屏幕」；电脑 Chrome/Edge 地址栏点击「安装 Trading Studio」图标即可。</div>
-            """,
-            elem_classes=["dark-panel"],
-        )
+                """,
+                elem_classes=["dark-panel"],
+            )
+            gr.HTML(INSTALL_APP_BUTTON_HTML)
 
         with gr.Row(elem_classes=["status-row"]):
             ollama_status = gr.HTML(value=_status_html("Ollama 节点", "正在检测...", "warn"))
@@ -544,9 +787,12 @@ def build_app() -> gr.Blocks:
         with gr.Tabs():
             # ---- Tab 1: 音色锁定 ----
             with gr.Tab("🎙️ 音色锁定"):
-                gr.Markdown(
-                    "上传 **10-30 秒** 干净人声样本，系统将提取 Speaker Embedding "
-                    f"并保存至 `{SPEAKER_EMB_PATH.name}`，后续合成 100% 还原音色。"
+                gr.HTML(
+                    f'<div class="hint-box">'
+                    f'上传 <strong>10-30 秒</strong> 干净人声样本，系统将提取 Speaker Embedding '
+                    f'并保存至 <span class="file-tag">{SPEAKER_EMB_PATH.name}</span>，'
+                    f'后续合成 <strong>100% 还原音色</strong>。'
+                    f"</div>"
                 )
                 with gr.Row():
                     spk_audio = gr.Audio(
@@ -556,8 +802,10 @@ def build_app() -> gr.Blocks:
                     )
                     spk_transcript = gr.Textbox(
                         label="参考音频精确转写（可选，提升还原度）",
-                        placeholder="尽量与参考音频内容完全一致...",
+                        placeholder="示例：今天开了三单，第一单手贱提前平了，第二单…",
+                        info="请尽量与参考音频内容完全一致，可提升音色还原度",
                         lines=6,
+                        elem_classes=["bright-input"],
                     )
                 lock_btn = gr.Button("🔒 锁定音色", variant="primary")
                 lock_log = gr.Textbox(label="锁定结果", lines=4, interactive=False)

pwa/icons/install.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" fill="none">
+  <rect x="8" y="8" width="48" height="48" rx="12" fill="#2563eb"/>
+  <path d="M32 18v22M32 40v4" stroke="#fff" stroke-width="4" stroke-linecap="round"/>
+  <path d="M22 32h20" stroke="#fff" stroke-width="4" stroke-linecap="round"/>
+  <path d="M32 18l-8 8h16l-8-8z" fill="#93c5fd"/>
+  <rect x="14" y="46" width="36" height="6" rx="3" fill="#1e40af"/>
+</svg>