diff --git a/backend-py/app/main.py b/backend-py/app/main.py
index a07c091..1b43dd4 100644
--- a/backend-py/app/main.py
+++ b/backend-py/app/main.py
@@ -1738,6 +1738,310 @@ def _handle_assembly_assign_dispatch(body):
     return {"ok": True, "status": "scheduled"}
 
 
+def _extra_act_columns():
+    return [
+        "id", "assembly_id", "created_by_tg_id",
+        "status",           # draft | agreed | signed | cancelled
+        "items_json",       # JSON: [{id, name, unit, price, qty, total, category, source}]
+        "total_amount",
+        "signed_by_name", "signed_via", "signed_at",
+        "signature_b64",
+        "client_agreed_at",
+        "notes",
+        "created_at", "updated_at",
+    ]
+
+
+def _ensure_extra_acts_sheet():
+    try:
+        sheets.sheet("ExtraActs")
+    except Exception:
+        sheets.ensure_sheet("ExtraActs", _extra_act_columns())
+        return
+    ws = sheets.sheet("ExtraActs")
+    existing = ws.row_values(1)
+    want = _extra_act_columns()
+    missing = [c for c in want if c not in existing]
+    if missing:
+        ws.update("A1", [existing + missing])
+
+
+def _handle_pricebook_list(body):
+    """Возвращает каталог для выбора позиций в акт."""
+    cfg = get_config()
+    auth = verify_init_data(body.get("initData") or "", cfg.bot_token)
+    if not auth or not auth.get("user"):
+        unsafe = body.get("initDataUnsafe") or {}
+        if isinstance(unsafe, dict) and unsafe.get("user", {}).get("id"):
+            auth = {"user": unsafe["user"]}
+        else:
+            return {"error": "invalid_init_data"}
+    tg_id = str(auth["user"]["id"])
+    user = sheets.find_user(tg_id)
+    if not user:
+        return {"error": "user_not_found"}
+    if not (sheets.has_role(user, "assembler") or sheets.has_role(user, "manager")):
+        return {"error": "forbidden"}
+
+    result = {"ok": True, "company": [], "personal": []}
+
+    try:
+        ws = sheets.sheet("PriceBook_Company")
+        rows = ws.get_all_values()
+        if rows and len(rows) > 1:
+            headers = rows[0]
+            for r in rows[1:]:
+                row = dict(zip(headers, r + [""] * max(0, len(headers) - len(r))))
+                if row.get("active", "yes") == "no":
+                    continue
+                try:
+                    price = float(row.get("price", 0) or 0)
+                except Exception:
+                    price = 0
+                result["company"].append({
+                    "id":       row.get("id", ""),
+                    "category": row.get("category", ""),
+                    "name":     row.get("name", ""),
+                    "unit":     row.get("unit", "шт."),
+                    "price":    price,
+                    "source":   "company",
+                })
+    except Exception as e:
+        log.warning("pricebook_company error: %s", e)
+
+    try:
+        ws = sheets.sheet("PriceBook_IP")
+        rows = ws.get_all_values()
+        if rows and len(rows) > 1:
+            headers = rows[0]
+            for r in rows[1:]:
+                row = dict(zip(headers, r + [""] * max(0, len(headers) - len(r))))
+                if row.get("active", "yes") == "no":
+                    continue
+                try:
+                    price = float(row.get("price", 0) or 0)
+                except Exception:
+                    price = 0
+                result["personal"].append({
+                    "id":       row.get("id", ""),
+                    "category": row.get("category", ""),
+                    "name":     row.get("name", ""),
+                    "unit":     row.get("unit", "шт."),
+                    "price":    price,
+                    "source":   "ip",
+                })
+    except Exception as e:
+        log.warning("pricebook_ip error: %s", e)
+
+    return result
+
+
+def _handle_extra_act_save(body):
+    """Создать или обновить черновик акта доп.работ."""
+    cfg = get_config()
+    auth = verify_init_data(body.get("initData") or "", cfg.bot_token)
+    if not auth or not auth.get("user"):
+        unsafe = body.get("initDataUnsafe") or {}
+        if isinstance(unsafe, dict) and unsafe.get("user", {}).get("id"):
+            auth = {"user": unsafe["user"]}
+        else:
+            return {"error": "invalid_init_data"}
+    tg_id = str(auth["user"]["id"])
+    user = sheets.find_user(tg_id)
+    if not user:
+        return {"error": "user_not_found"}
+    if not (sheets.has_role(user, "assembler") or sheets.has_role(user, "manager")):
+        return {"error": "forbidden"}
+
+    assembly_id = (body.get("assembly_id") or "").strip()
+    items       = body.get("items") or []
+    notes       = (body.get("notes") or "").strip()
+    act_id      = (body.get("act_id") or "").strip()
+
+    if not assembly_id:
+        return {"error": "missing_assembly_id"}
+    if not items:
+        return {"error": "missing_items"}
+
+    _ensure_extra_acts_sheet()
+
+    total = sum(
+        float(it.get("price", 0)) * max(1, int(it.get("qty", 1)))
+        for it in items
+    )
+
+    now = _now_iso()
+    if act_id:
+        existing = sheets.find_row("ExtraActs", "id", act_id)
+        if not existing or existing.get("created_by_tg_id") != tg_id:
+            return {"error": "not_found_or_forbidden"}
+        sheets.update_cell_by_key("ExtraActs", "id", act_id, "items_json",    json.dumps(items, ensure_ascii=False))
+        sheets.update_cell_by_key("ExtraActs", "id", act_id, "total_amount",  str(round(total, 2)))
+        sheets.update_cell_by_key("ExtraActs", "id", act_id, "notes",         notes)
+        sheets.update_cell_by_key("ExtraActs", "id", act_id, "updated_at",    now)
+        return {"ok": True, "act_id": act_id, "total": total}
+    else:
+        act_id = str(uuid.uuid4())[:8]
+        cols = _extra_act_columns()
+        base = {c: "" for c in cols}
+        base["id"]               = act_id
+        base["assembly_id"]      = assembly_id
+        base["created_by_tg_id"] = tg_id
+        base["status"]           = "draft"
+        base["items_json"]       = json.dumps(items, ensure_ascii=False)
+        base["total_amount"]     = str(round(total, 2))
+        base["notes"]            = notes
+        base["created_at"]       = now
+        base["updated_at"]       = now
+        sheets.append_row("ExtraActs", [str(base.get(c, "")) for c in cols])
+
+        # Уведомить менеджера
+        try:
+            asm = sheets.find_row("Assemblies", "id", assembly_id)
+            mgr_id = asm.get("manager_tg_id") if asm else None
+            if mgr_id and mgr_id != tg_id:
+                items_preview = "\n".join(
+                    f"• {it.get('name','')} × {it.get('qty',1)} = {int(float(it.get('price',0))*int(it.get('qty',1)))} ₽"
+                    for it in items[:5]
+                )
+                tg.send_message(int(mgr_id),
+                    f"📋 <b>Акт доп.работ создан</b>\n"
+                    f"Сборка: {assembly_id}\n"
+                    f"Клиент: {asm.get('client_name','')}\n\n"
+                    f"{items_preview}\n\n"
+                    f"<b>Итого: {round(total):,} ₽</b>".replace(",", " "))
+        except Exception as e:
+            log.warning("extra_act notify error: %s", e)
+
+        return {"ok": True, "act_id": act_id, "total": total}
+
+
+def _handle_extra_act_sign(body):
+    """Сборщик подписывает акт (canvas или OTP)."""
+    cfg = get_config()
+    auth = verify_init_data(body.get("initData") or "", cfg.bot_token)
+    if not auth or not auth.get("user"):
+        unsafe = body.get("initDataUnsafe") or {}
+        if isinstance(unsafe, dict) and unsafe.get("user", {}).get("id"):
+            auth = {"user": unsafe["user"]}
+        else:
+            return {"error": "invalid_init_data"}
+    tg_id = str(auth["user"]["id"])
+    user = sheets.find_user(tg_id)
+    if not user:
+        return {"error": "user_not_found"}
+
+    act_id       = (body.get("act_id") or "").strip()
+    signed_via   = (body.get("signed_via") or "canvas").strip()   # canvas | telegram_otp
+    signature_b64 = (body.get("signature_b64") or "").strip()
+    signer_name  = (body.get("signed_by_name") or "").strip()
+
+    if not act_id:
+        return {"error": "missing_act_id"}
+
+    _ensure_extra_acts_sheet()
+    act = sheets.find_row("ExtraActs", "id", act_id)
+    if not act:
+        return {"error": "act_not_found"}
+    if act.get("status") not in ("draft", "agreed"):
+        return {"error": "already_signed"}
+
+    name = signer_name or (user.get("name") or user.get("first_name") or tg_id)
+    now  = _now_iso()
+
+    for col, val in [
+        ("status",        "signed"),
+        ("signed_by_name", name),
+        ("signed_via",    signed_via),
+        ("signed_at",     now),
+        ("signature_b64", signature_b64),
+        ("updated_at",    now),
+    ]:
+        sheets.update_cell_by_key("ExtraActs", "id", act_id, col, val)
+
+    return {"ok": True, "signed": True, "signed_by_name": name}
+
+
+def _handle_extra_acts_list(body):
+    """Список актов доп.работ по сборке."""
+    cfg = get_config()
+    auth = verify_init_data(body.get("initData") or "", cfg.bot_token)
+    if not auth or not auth.get("user"):
+        unsafe = body.get("initDataUnsafe") or {}
+        if isinstance(unsafe, dict) and unsafe.get("user", {}).get("id"):
+            auth = {"user": unsafe["user"]}
+        else:
+            return {"error": "invalid_init_data"}
+    tg_id = str(auth["user"]["id"])
+    user = sheets.find_user(tg_id)
+    if not user:
+        return {"error": "user_not_found"}
+
+    assembly_id = (body.get("assembly_id") or "").strip()
+
+    _ensure_extra_acts_sheet()
+    try:
+        ws = sheets.sheet("ExtraActs")
+        rows = ws.get_all_values()
+    except Exception:
+        return {"ok": True, "acts": []}
+
+    if not rows or len(rows) < 2:
+        return {"ok": True, "acts": []}
+
+    headers = rows[0]
+    out = []
+    for r in rows[1:]:
+        row = dict(zip(headers, r + [""] * max(0, len(headers) - len(r))))
+        if assembly_id and row.get("assembly_id") != assembly_id:
+            continue
+        # Только свои или менеджер
+        if row.get("created_by_tg_id") != tg_id and not sheets.has_role(user, "manager"):
+            continue
+        try:
+            items = json.loads(row.get("items_json") or "[]")
+        except Exception:
+            items = []
+        out.append({
+            "id":            row.get("id"),
+            "assembly_id":   row.get("assembly_id"),
+            "status":        row.get("status", "draft"),
+            "total_amount":  row.get("total_amount", "0"),
+            "items_count":   len(items),
+            "signed_by_name": row.get("signed_by_name"),
+            "signed_at":     row.get("signed_at"),
+            "created_at":    row.get("created_at"),
+            "notes":         row.get("notes"),
+        })
+
+    out.sort(key=lambda x: x.get("created_at", ""), reverse=True)
+    return {"ok": True, "acts": out}
+
+
+@app.post("/api/pricebook_list")
+async def api_pricebook_list(request: Request):
+    body = await _safe_json(request)
+    return JSONResponse(_handle_pricebook_list(body))
+
+
+@app.post("/api/extra_act_save")
+async def api_extra_act_save(request: Request):
+    body = await _safe_json(request)
+    return JSONResponse(_handle_extra_act_save(body))
+
+
+@app.post("/api/extra_act_sign")
+async def api_extra_act_sign(request: Request):
+    body = await _safe_json(request)
+    return JSONResponse(_handle_extra_act_sign(body))
+
+
+@app.post("/api/extra_acts_list")
+async def api_extra_acts_list(request: Request):
+    body = await _safe_json(request)
+    return JSONResponse(_handle_extra_acts_list(body))
+
+
 @app.post("/api/dispatcher_inbox")
 async def api_dispatcher_inbox(request: Request):
     body = await _safe_json(request)
diff --git a/miniapp/assets/app.js b/miniapp/assets/app.js
index f087c9c..2d148fc 100644
--- a/miniapp/assets/app.js
+++ b/miniapp/assets/app.js
@@ -1972,7 +1972,11 @@ function routeByHash() {
     const asmId = location.hash.replace("#/expeditor/act/", "").split("?")[0];
     if (typeof ExpeditorDashboard !== "undefined") ExpeditorDashboard.mountAct(app, asmId);
     else init();
-  } else if (location.hash.startsWith("#/assembly/") && location.hash.endsWith("/act4")) {
+  } else if (location.hash.startsWith("#/assembly/") && location.hash.endsWith("/extra_acts")) {
+    const asmId = location.hash.split("/")[2];
+    if (typeof ExtraActs !== "undefined") ExtraActs.mount(app, asmId);
+    else init();
+    } else if (location.hash.startsWith("#/assembly/") && location.hash.endsWith("/act4")) {
     const asmId = location.hash.split("/")[2];
     if (typeof Act4Screen !== "undefined") Act4Screen.mount(app, asmId);
     else init();
diff --git a/miniapp/assets/assembly_detail.js b/miniapp/assets/assembly_detail.js
index 18bd36b..f44646b 100644
--- a/miniapp/assets/assembly_detail.js
+++ b/miniapp/assets/assembly_detail.js
@@ -961,6 +961,22 @@ const AssemblyDetailScreen = (function () {
       act4Wrap.appendChild(act4Btn);
       screen.appendChild(act4Wrap);
 
+            // Кнопка «Акт доп.работ» — для сборщика и менеджера
+      if (data.viewer_is_assembler || data.viewer_is_manager) {
+        const extraWrap = document.createElement("div");
+        extraWrap.style.cssText = "margin:8px 16px 0;";
+        const extraBtn = document.createElement("button");
+        extraBtn.className = "btn-secondary";
+        extraBtn.style.cssText = "width:100%;font-size:14px;padding:11px;";
+        extraBtn.textContent = "📋 Акт доп. работ";
+        extraBtn.addEventListener("click", () => {
+          haptic && haptic("impact");
+          location.hash = `#/assembly/${data.id}/extra_acts`;
+        });
+        extraWrap.appendChild(extraBtn);
+        screen.appendChild(extraWrap);
+      }
+
       // Кнопка «Акт сдачи-приёмки» — для менеджера всегда доступна
       const actWrap = document.createElement("div");
       actWrap.style.cssText = "margin:8px 16px 0;";
diff --git a/miniapp/assets/extra_acts.js b/miniapp/assets/extra_acts.js
new file mode 100644
index 0000000..b687057
--- /dev/null
+++ b/miniapp/assets/extra_acts.js
@@ -0,0 +1,321 @@
+// extra_acts.js v=20260521a
+const ExtraActs = (function () {
+  "use strict";
+
+  function fmt(n) { return Math.round(n||0).toLocaleString("ru-RU") + " ₽"; }
+  function fmtDate(iso) { if(!iso) return "—"; const d=iso.slice(0,10).split("-"); return d[2]+"."+d[1]+"."+d[0]; }
+  function el(html) { const t=document.createElement("div"); t.innerHTML=html.trim(); return t.firstChild; }
+  function showErr(c,msg){ c.innerHTML=`<div style="padding:32px;text-align:center;color:var(--danger)">${msg}</div>`; }
+
+  const STATUS = { draft:"Черновик", agreed:"Согласован", signed:"Подписан", cancelled:"Отменён" };
+  const STATUS_BG = { draft:"#eee", agreed:"#CCE5FF", signed:"#D1E7DD", cancelled:"#f8d7da" };
+  const STATUS_FG = { draft:"#555", agreed:"#004085", signed:"#0F5132", cancelled:"#721c24" };
+
+  function badge(status) {
+    return `<span style="background:${STATUS_BG[status]||'#eee'};color:${STATUS_FG[status]||'#333'};padding:2px 8px;border-radius:6px;font-size:12px;font-weight:600">${STATUS[status]||status}</span>`;
+  }
+
+  // ─── LIST ─────────────────────────────────────────────────────────
+  async function mount(container, assemblyId) {
+    container.innerHTML = `
+      <div style="display:flex;align-items:center;gap:12px;padding:16px;background:var(--surface);border-bottom:1px solid #eee;position:sticky;top:0;z-index:10">
+        <button onclick="history.back()" style="background:none;border:none;font-size:22px;cursor:pointer;padding:0">←</button>
+        <span style="font-size:17px;font-weight:700;flex:1">📋 Доп. работы</span>
+        <button id="new-act-btn" style="background:var(--accent);color:#fff;border:none;border-radius:8px;padding:8px 14px;font-size:14px;font-weight:600;cursor:pointer">+ Новый акт</button>
+      </div>
+      <div id="list-body" style="padding:12px"></div>`;
+
+    container.querySelector("#new-act-btn").addEventListener("click", () => mountCreate(container, assemblyId));
+
+    const body = container.querySelector("#list-body");
+    body.innerHTML = `<div style="text-align:center;padding:40px;color:var(--muted)">Загрузка…</div>`;
+
+    let data;
+    try { data = await _api("/api/extra_acts_list", { assembly_id: assemblyId }); }
+    catch(e) { showErr(body, "Ошибка: "+e.message); return; }
+    if (data.error) { showErr(body, data.error); return; }
+
+    const acts = data.acts || [];
+    if (!acts.length) {
+      body.innerHTML = `<div style="text-align:center;padding:40px;color:var(--muted)">Нет актов по этой сборке</div>`;
+      return;
+    }
+    body.innerHTML = "";
+    acts.forEach(a => {
+      const card = el(`<div style="background:var(--surface);border-radius:var(--radius);padding:14px 16px;margin-bottom:10px;box-shadow:0 1px 4px rgba(0,0,0,.07)">
+        <div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:6px">
+          <span style="font-weight:600;font-size:15px">${fmt(parseFloat(a.total_amount||0))}</span>
+          ${badge(a.status)}
+        </div>
+        <div style="font-size:13px;color:var(--muted)">${a.items_count} позиций · ${fmtDate(a.created_at)}</div>
+        ${a.signed_by_name ? `<div style="font-size:12px;color:var(--muted);margin-top:2px">Подписал: ${a.signed_by_name} · ${fmtDate(a.signed_at)}</div>` : ""}
+        ${a.notes ? `<div style="font-size:12px;color:var(--muted);margin-top:4px;font-style:italic">${a.notes}</div>` : ""}
+      </div>`);
+      body.appendChild(card);
+    });
+  }
+
+  // ─── CREATE ───────────────────────────────────────────────────────
+  async function mountCreate(container, assemblyId) {
+    container.innerHTML = `
+      <div style="display:flex;align-items:center;gap:12px;padding:16px;background:var(--surface);border-bottom:1px solid #eee;position:sticky;top:0;z-index:10">
+        <button id="back-btn" style="background:none;border:none;font-size:22px;cursor:pointer;padding:0">←</button>
+        <span style="font-size:17px;font-weight:700">➕ Новый акт</span>
+      </div>
+      <div id="catalog-body" style="padding:12px;padding-bottom:180px"></div>
+      <div id="basket-panel" style="position:fixed;bottom:0;left:0;right:0;max-width:600px;margin:0 auto;background:var(--surface);border-top:2px solid var(--accent);padding:12px 16px;z-index:20;box-shadow:0 -2px 12px rgba(0,0,0,.1)"></div>`;
+
+    container.querySelector("#back-btn").addEventListener("click", () => mount(container, assemblyId));
+
+    const catalogBody = container.querySelector("#catalog-body");
+    const basketPanel = container.querySelector("#basket-panel");
+
+    // Basket state
+    const basket = {}; // id -> {item, qty}
+    const updateBasket = () => _renderBasket(basketPanel, basket, assemblyId, container);
+    updateBasket();
+
+    catalogBody.innerHTML = `<div style="text-align:center;padding:40px;color:var(--muted)">Загрузка каталога…</div>`;
+
+    let pb;
+    try { pb = await _api("/api/pricebook_list", {}); }
+    catch(e) { showErr(catalogBody, "Ошибка: "+e.message); return; }
+    if (pb.error) { showErr(catalogBody, pb.error); return; }
+
+    catalogBody.innerHTML = "";
+    _renderSection(catalogBody, "Прайс компании", pb.company||[], basket, updateBasket);
+    _renderSection(catalogBody, "Мой прайс (ИП)", pb.personal||[], basket, updateBasket);
+  }
+
+  function _renderSection(parent, title, items, basket, updateBasket) {
+    if (!items.length) return;
+
+    const section = el(`<div style="margin-bottom:16px">
+      <div style="font-size:14px;font-weight:700;color:var(--accent);padding:8px 0;border-bottom:2px solid var(--accent);margin-bottom:8px">${title}</div>
+    </div>`);
+
+    // Group by category
+    const cats = {};
+    items.forEach(it => { (cats[it.category] = cats[it.category]||[]).push(it); });
+
+    Object.entries(cats).forEach(([cat, catItems]) => {
+      const catWrap = el(`<div style="margin-bottom:8px">`);
+      const catHead = el(`<div style="display:flex;justify-content:space-between;align-items:center;padding:8px 10px;background:#f0f4ff;border-radius:8px;cursor:pointer;margin-bottom:4px">
+        <span style="font-size:13px;font-weight:600;color:var(--text)">${cat}</span>
+        <span class="cat-arrow" style="font-size:14px;color:var(--muted)">▼</span>
+      </div>`);
+      const catList = el(`<div class="cat-list" style="display:none">`);
+
+      catHead.addEventListener("click", () => {
+        const shown = catList.style.display !== "none";
+        catList.style.display = shown ? "none" : "block";
+        catHead.querySelector(".cat-arrow").textContent = shown ? "▼" : "▲";
+      });
+
+      catItems.forEach(item => {
+        const row = el(`<div style="display:flex;align-items:center;gap:8px;padding:8px 4px;border-bottom:1px solid #f0f0f0">
+          <div style="flex:1;min-width:0">
+            <div style="font-size:13px;color:var(--text);line-height:1.3">${item.name}</div>
+            <div style="font-size:11px;color:var(--muted)">${item.unit} · ${fmt(item.price)}</div>
+          </div>
+          <button data-id="${item.id}" style="background:var(--accent);color:#fff;border:none;border-radius:6px;width:30px;height:30px;font-size:18px;cursor:pointer;flex-shrink:0;display:flex;align-items:center;justify-content:center;line-height:1">+</button>
+        </div>`);
+        row.querySelector("button").addEventListener("click", () => {
+          if (basket[item.id]) {
+            basket[item.id].qty++;
+          } else {
+            basket[item.id] = { item, qty: 1 };
+          }
+          haptic && haptic("impact");
+          // Flash button
+          const btn = row.querySelector("button");
+          btn.style.background = "#4CAF50";
+          setTimeout(() => { btn.style.background = "var(--accent)"; }, 200);
+          updateBasket();
+        });
+        catList.appendChild(row);
+      });
+
+      catWrap.appendChild(catHead);
+      catWrap.appendChild(catList);
+      section.appendChild(catWrap);
+    });
+    parent.appendChild(section);
+  }
+
+  function _renderBasket(panel, basket, assemblyId, container) {
+    const entries = Object.values(basket).filter(e => e.qty > 0);
+    const total = entries.reduce((s, e) => s + e.item.price * e.qty, 0);
+
+    if (!entries.length) {
+      panel.innerHTML = `<div style="color:var(--muted);font-size:13px;text-align:center;padding:4px 0">Добавьте позиции из каталога</div>`;
+      return;
+    }
+
+    panel.innerHTML = "";
+
+    // Items compact list (max 3 visible)
+    const listWrap = el(`<div style="max-height:80px;overflow-y:auto;margin-bottom:8px">`);
+    entries.forEach(({ item, qty }) => {
+      const row = el(`<div style="display:flex;align-items:center;gap:6px;padding:3px 0;font-size:13px">
+        <span style="flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap">${item.name}</span>
+        <button data-id="${item.id}" class="qty-minus" style="background:#eee;border:none;border-radius:4px;width:22px;height:22px;cursor:pointer;font-size:14px">−</button>
+        <span style="min-width:16px;text-align:center">${qty}</span>
+        <button data-id="${item.id}" class="qty-plus" style="background:#eee;border:none;border-radius:4px;width:22px;height:22px;cursor:pointer;font-size:14px">+</button>
+        <span style="min-width:60px;text-align:right;color:var(--accent);font-weight:600">${fmt(item.price*qty)}</span>
+        <button data-id="${item.id}" class="qty-del" style="background:none;border:none;cursor:pointer;font-size:16px;color:var(--muted)">×</button>
+      </div>`);
+      row.querySelector(".qty-minus").addEventListener("click", () => {
+        basket[item.id].qty = Math.max(0, basket[item.id].qty - 1);
+        if (basket[item.id].qty === 0) delete basket[item.id];
+        _renderBasket(panel, basket, assemblyId, container);
+      });
+      row.querySelector(".qty-plus").addEventListener("click", () => {
+        basket[item.id].qty++; _renderBasket(panel, basket, assemblyId, container);
+      });
+      row.querySelector(".qty-del").addEventListener("click", () => {
+        delete basket[item.id]; _renderBasket(panel, basket, assemblyId, container);
+      });
+      listWrap.appendChild(row);
+    });
+    panel.appendChild(listWrap);
+
+    // Textarea note
+    const noteArea = el(`<textarea id="act-notes" placeholder="Примечание (необязательно)" style="width:100%;padding:8px;border:1px solid #ddd;border-radius:8px;font-size:13px;resize:none;height:40px;box-sizing:border-box;margin-bottom:8px;font-family:inherit"></textarea>`);
+    panel.appendChild(noteArea);
+
+    // Total + button
+    const foot = el(`<div style="display:flex;align-items:center;justify-content:space-between;gap:10px">
+      <div style="font-size:16px;font-weight:700;color:var(--accent)">${fmt(total)}</div>
+      <button id="act-submit" style="background:var(--accent);color:#fff;border:none;border-radius:8px;padding:10px 20px;font-size:15px;font-weight:600;cursor:pointer">Оформить акт →</button>
+    </div>`);
+    foot.querySelector("#act-submit").addEventListener("click", async () => {
+      const notes = panel.querySelector("#act-notes")?.value || "";
+      const items = Object.values(basket).map(({ item, qty }) => ({
+        id: item.id, name: item.name, unit: item.unit,
+        price: item.price, qty, total: item.price * qty,
+        category: item.category, source: item.source
+      }));
+      haptic && haptic("impact");
+      const btn = foot.querySelector("#act-submit");
+      btn.disabled = true; btn.textContent = "Сохраняем…";
+      let res;
+      try { res = await _api("/api/extra_act_save", { assembly_id: assemblyId, items, notes }); }
+      catch(e) { alert("Ошибка: "+e.message); btn.disabled=false; btn.textContent="Оформить акт →"; return; }
+      if (res.error) { alert(res.error); btn.disabled=false; btn.textContent="Оформить акт →"; return; }
+      _mountSign(container, res.act_id, assemblyId, res.total, items.length);
+    });
+    panel.appendChild(foot);
+  }
+
+  // ─── SIGN ─────────────────────────────────────────────────────────
+  function _mountSign(container, actId, assemblyId, total, itemCount) {
+    container.innerHTML = `
+      <div style="display:flex;align-items:center;gap:12px;padding:16px;background:var(--surface);border-bottom:1px solid #eee;position:sticky;top:0;z-index:10">
+        <button onclick="history.back()" style="background:none;border:none;font-size:22px;cursor:pointer;padding:0">←</button>
+        <span style="font-size:17px;font-weight:700">Подписать акт</span>
+      </div>
+      <div style="padding:16px">
+        <div style="background:var(--surface);border-radius:var(--radius);padding:20px;text-align:center;margin-bottom:16px;box-shadow:0 1px 4px rgba(0,0,0,.07)">
+          <div style="font-size:13px;color:var(--muted);margin-bottom:4px">${itemCount} позиций</div>
+          <div style="font-size:28px;font-weight:700;color:var(--accent)">${fmt(total)}</div>
+          <div style="font-size:12px;color:var(--muted);margin-top:4px">Акт № ${actId}</div>
+        </div>
+
+        <div style="display:flex;gap:0;margin-bottom:16px;border-radius:var(--radius);overflow:hidden;border:1px solid #ddd">
+          <button id="tab-canvas" class="sign-tab" style="flex:1;padding:10px;background:var(--accent);color:#fff;border:none;font-size:14px;font-weight:600;cursor:pointer">✍️ Подпись</button>
+          <button id="tab-draft" class="sign-tab" style="flex:1;padding:10px;background:var(--surface);color:var(--text);border:none;font-size:14px;cursor:pointer">💾 Черновик</button>
+        </div>
+
+        <div id="panel-canvas">
+          <canvas id="sign-canvas" style="width:100%;height:160px;border:2px solid #ddd;border-radius:var(--radius);touch-action:none;background:#fff;display:block"></canvas>
+          <div style="display:flex;gap:8px;margin-top:10px">
+            <button id="clear-btn" style="flex:1;padding:10px;background:#eee;border:none;border-radius:8px;font-size:14px;cursor:pointer">Очистить</button>
+            <button id="sign-btn" style="flex:2;padding:10px;background:var(--accent);color:#fff;border:none;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer">Подписать акт</button>
+          </div>
+        </div>
+
+        <div id="panel-draft" style="display:none">
+          <div style="color:var(--muted);font-size:13px;text-align:center;padding:16px">Акт будет сохранён как черновик. Подпись можно добавить позже.</div>
+          <button id="draft-btn" style="width:100%;padding:12px;background:#eee;border:none;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer">Сохранить черновик</button>
+        </div>
+
+        <div id="sign-result" style="display:none"></div>
+      </div>`;
+
+    // Tabs
+    container.querySelector("#tab-canvas").addEventListener("click", () => {
+      container.querySelector("#panel-canvas").style.display = "block";
+      container.querySelector("#panel-draft").style.display  = "none";
+      container.querySelector("#tab-canvas").style.background = "var(--accent)";
+      container.querySelector("#tab-canvas").style.color = "#fff";
+      container.querySelector("#tab-draft").style.background  = "var(--surface)";
+      container.querySelector("#tab-draft").style.color = "var(--text)";
+    });
+    container.querySelector("#tab-draft").addEventListener("click", () => {
+      container.querySelector("#panel-canvas").style.display = "none";
+      container.querySelector("#panel-draft").style.display  = "block";
+      container.querySelector("#tab-draft").style.background = "var(--accent)";
+      container.querySelector("#tab-draft").style.color = "#fff";
+      container.querySelector("#tab-canvas").style.background = "var(--surface)";
+      container.querySelector("#tab-canvas").style.color = "var(--text)";
+    });
+
+    // Canvas setup
+    const canvas = container.querySelector("#sign-canvas");
+    const dpr = window.devicePixelRatio || 1;
+    setTimeout(() => {
+      const w = canvas.offsetWidth; const h = canvas.offsetHeight;
+      canvas.width = w * dpr; canvas.height = h * dpr;
+      const ctx = canvas.getContext("2d");
+      ctx.scale(dpr, dpr);
+      ctx.strokeStyle = "#212121"; ctx.lineWidth = 2.5;
+      ctx.lineCap = "round"; ctx.lineJoin = "round";
+      let drawing = false;
+
+      const pos = (e) => {
+        const r = canvas.getBoundingClientRect();
+        const src = e.touches ? e.touches[0] : e;
+        return { x: (src.clientX - r.left), y: (src.clientY - r.top) };
+      };
+      canvas.addEventListener("pointerdown", e => { drawing=true; ctx.beginPath(); const p=pos(e); ctx.moveTo(p.x,p.y); e.preventDefault(); });
+      canvas.addEventListener("pointermove", e => { if(!drawing) return; const p=pos(e); ctx.lineTo(p.x,p.y); ctx.stroke(); e.preventDefault(); });
+      canvas.addEventListener("pointerup", () => { drawing=false; });
+      canvas.addEventListener("pointerleave", () => { drawing=false; });
+    }, 50);
+
+    container.querySelector("#clear-btn").addEventListener("click", () => {
+      const ctx = canvas.getContext("2d");
+      ctx.clearRect(0, 0, canvas.width, canvas.height);
+    });
+
+    const _doSign = async (via, b64) => {
+      haptic && haptic("impact");
+      let res;
+      try { res = await _api("/api/extra_act_sign", { act_id: actId, signed_via: via, signature_b64: b64 }); }
+      catch(e) { alert("Ошибка: "+e.message); return; }
+      if (res.error) { alert(res.error); return; }
+      _showSuccess(container, actId, assemblyId, total, via === "canvas");
+    };
+
+    container.querySelector("#sign-btn").addEventListener("click", () => {
+      _doSign("canvas", canvas.toDataURL("image/png"));
+    });
+    container.querySelector("#draft-btn").addEventListener("click", () => {
+      mount(container, assemblyId);
+    });
+  }
+
+  function _showSuccess(container, actId, assemblyId, total, signed) {
+    container.innerHTML = `
+      <div style="display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;padding:32px;text-align:center">
+        <div style="font-size:56px;margin-bottom:16px">${signed ? "✅" : "💾"}</div>
+        <div style="font-size:20px;font-weight:700;margin-bottom:8px">${signed ? "Акт подписан" : "Черновик сохранён"}</div>
+        <div style="font-size:24px;font-weight:700;color:var(--accent);margin-bottom:24px">${fmt(total)}</div>
+        <div style="font-size:13px;color:var(--muted);margin-bottom:32px">Акт № ${actId}</div>
+        <button onclick="history.back()" style="padding:14px 32px;background:var(--accent);color:#fff;border:none;border-radius:10px;font-size:16px;font-weight:600;cursor:pointer">← Назад</button>
+      </div>`;
+  }
+
+  return { mount, mountCreate };
+})();