From 40ff17657faa0d2ae69c408f657705763dde0272 Mon Sep 17 00:00:00 2001
From: m <paragraphenreiter@gmail.com>
Date: Thu, 16 Apr 2026 10:48:42 +0200
Subject: [PATCH] =?UTF-8?q?feat:=20Checklisten=20=E2=80=94=20interactive?=
 =?UTF-8?q?=20filing=20checklists=20with=20localStorage=20state?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Six bilingual patent-workflow checklists (UPC Statement of Claim, Defence,
Confidentiality Application, Representative Registration; BPatG Nullity;
EPO Opposition) with grouped items, rule references, and tips. Index page
lists cards with regime filter and per-checklist progress; detail page
persists check state in localStorage (patholo:checklist:<slug>), shows a
live progress bar, supports reset and print, and submits feedback via
Supabase checklisten_feedback.
---
 docs/migrations/002_checklisten_feedback.sql |  20 +
 frontend/build.ts                            |   6 +
 frontend/src/checklisten-detail.tsx          |  95 ++++
 frontend/src/checklisten.tsx                 |  44 ++
 frontend/src/client/checklisten-detail.ts    | 272 ++++++++++
 frontend/src/client/checklisten.ts           | 104 ++++
 frontend/src/client/i18n.ts                  |  60 +++
 frontend/src/components/Sidebar.tsx          |   2 +
 frontend/src/index.tsx                       |   7 +
 frontend/src/styles/global.css               | 379 ++++++++++++++
 internal/handlers/checklisten.go             | 510 +++++++++++++++++++
 internal/handlers/handlers.go                |   5 +
 12 files changed, 1504 insertions(+)
 create mode 100644 docs/migrations/002_checklisten_feedback.sql
 create mode 100644 frontend/src/checklisten-detail.tsx
 create mode 100644 frontend/src/checklisten.tsx
 create mode 100644 frontend/src/client/checklisten-detail.ts
 create mode 100644 frontend/src/client/checklisten.ts
 create mode 100644 internal/handlers/checklisten.go

diff --git a/docs/migrations/002_checklisten_feedback.sql b/docs/migrations/002_checklisten_feedback.sql
new file mode 100644
index 0000000..714e7fd
--- /dev/null
+++ b/docs/migrations/002_checklisten_feedback.sql
@@ -0,0 +1,20 @@
+-- Migration: Checklisten feedback table for patholo
+-- Target: ydb.youpc.org (patholo's Supabase instance)
+-- Apply via Supabase SQL editor or psql
+
+CREATE TABLE IF NOT EXISTS checklisten_feedback (
+    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    feedback_type text NOT NULL,
+    checklist text NOT NULL DEFAULT '',
+    message text NOT NULL,
+    submitted_by text DEFAULT '',
+    created_at timestamptz NOT NULL DEFAULT now()
+);
+
+ALTER TABLE checklisten_feedback ENABLE ROW LEVEL SECURITY;
+
+-- Authenticated users may insert feedback; read access is admin-only
+-- (matches the gebuehrentabellen_feedback / glossar_suggestions pattern).
+CREATE POLICY "authenticated_insert_feedback" ON checklisten_feedback
+    FOR INSERT TO authenticated
+    WITH CHECK (true);
diff --git a/frontend/build.ts b/frontend/build.ts
index 1e7712f..0d95d6b 100644
--- a/frontend/build.ts
+++ b/frontend/build.ts
@@ -8,6 +8,8 @@ import { renderDownloads } from "./src/downloads";
 import { renderLinks } from "./src/links";
 import { renderGlossar } from "./src/glossar";
 import { renderGebuehrentabellen } from "./src/gebuehrentabellen";
+import { renderChecklisten } from "./src/checklisten";
+import { renderChecklistenDetail } from "./src/checklisten-detail";
 
 const DIST = join(import.meta.dir, "dist");
 
@@ -27,6 +29,8 @@ async function build() {
       join(import.meta.dir, "src/client/links.ts"),
       join(import.meta.dir, "src/client/glossar.ts"),
       join(import.meta.dir, "src/client/gebuehrentabellen.ts"),
+      join(import.meta.dir, "src/client/checklisten.ts"),
+      join(import.meta.dir, "src/client/checklisten-detail.ts"),
     ],
     outdir: join(DIST, "assets"),
     naming: "[name].js",
@@ -56,6 +60,8 @@ async function build() {
   await Bun.write(join(DIST, "links.html"), renderLinks());
   await Bun.write(join(DIST, "glossar.html"), renderGlossar());
   await Bun.write(join(DIST, "gebuehrentabellen.html"), renderGebuehrentabellen());
+  await Bun.write(join(DIST, "checklisten.html"), renderChecklisten());
+  await Bun.write(join(DIST, "checklisten-detail.html"), renderChecklistenDetail());
 
   console.log("Build complete \u2192 dist/");
 }
diff --git a/frontend/src/checklisten-detail.tsx b/frontend/src/checklisten-detail.tsx
new file mode 100644
index 0000000..84ec088
--- /dev/null
+++ b/frontend/src/checklisten-detail.tsx
@@ -0,0 +1,95 @@
+import { h } from "./jsx";
+import { Sidebar } from "./components/Sidebar";
+import { Footer } from "./components/Footer";
+
+export function renderChecklistenDetail(): string {
+  return "<!DOCTYPE html>" + (
+    <html lang="de">
+      <head>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <title data-i18n="checklisten.title">Checkliste &mdash; patHoLo</title>
+        <link rel="stylesheet" href="/assets/global.css" />
+      </head>
+      <body className="has-sidebar">
+        <Sidebar currentPath="/checklisten" />
+
+        <main>
+          <section className="tool-page">
+            <div className="container">
+              <a href="/checklisten" className="checklist-back">
+                <span className="checklist-back-arrow">&larr;</span>
+                <span data-i18n="checklisten.back">Zur&uuml;ck zur &Uuml;bersicht</span>
+              </a>
+
+              <div className="tool-header checklist-detail-header">
+                <div className="checklist-detail-head-row">
+                  <div>
+                    <h1 id="checklist-title">&nbsp;</h1>
+                    <p className="tool-subtitle" id="checklist-subtitle">&nbsp;</p>
+                    <dl className="checklist-meta" id="checklist-meta" />
+                  </div>
+                  <div className="checklist-actions">
+                    <button type="button" id="btn-print" className="btn-ghost" data-i18n="checklisten.print">Drucken</button>
+                    <button type="button" id="btn-reset" className="btn-ghost" data-i18n="checklisten.reset">Zur&uuml;cksetzen</button>
+                    <button type="button" id="btn-feedback" className="btn-suggest">
+                      <span data-i18n="checklisten.feedback.btn">Feedback</span>
+                    </button>
+                  </div>
+                </div>
+
+                <div className="checklist-progress">
+                  <div className="checklist-progress-bar">
+                    <div className="checklist-progress-fill" id="progress-fill" />
+                  </div>
+                  <span className="checklist-progress-label" id="progress-label">0 / 0</span>
+                </div>
+              </div>
+
+              <div id="checklist-groups" className="checklist-groups" />
+
+              <div className="checklist-print-footer">
+                <p className="checklist-disclaimer" data-i18n="checklisten.disclaimer">
+                  Hinweis: Diese Checklisten dienen als Ged&auml;chtnisst&uuml;tze und ersetzen keine Pr&uuml;fung im Einzelfall. Ma&szlig;geblich sind die jeweils geltenden Verfahrensregeln.
+                </p>
+              </div>
+            </div>
+          </section>
+        </main>
+
+        {/* Feedback modal */}
+        <div className="modal-overlay" id="feedback-modal" style="display:none">
+          <div className="modal-card">
+            <div className="modal-header">
+              <h2 data-i18n="checklisten.feedback.title">Feedback zur Checkliste</h2>
+              <button className="modal-close" id="modal-close" type="button">&times;</button>
+            </div>
+            <form id="feedback-form">
+              <div className="form-field">
+                <label htmlFor="feedback-type" data-i18n="checklisten.feedback.type">Art</label>
+                <select id="feedback-type" required>
+                  <option value="error" data-i18n="checklisten.feedback.error">Fehler gefunden</option>
+                  <option value="missing" data-i18n="checklisten.feedback.missing">Fehlender Punkt</option>
+                  <option value="suggestion" data-i18n="checklisten.feedback.suggestion">Verbesserungsvorschlag</option>
+                  <option value="other" data-i18n="checklisten.feedback.other">Sonstiges</option>
+                </select>
+              </div>
+              <div className="form-field">
+                <label htmlFor="feedback-message" data-i18n="checklisten.feedback.message">Nachricht</label>
+                <textarea id="feedback-message" rows={4} required />
+              </div>
+              <div className="form-actions">
+                <button type="button" className="btn-cancel" id="modal-cancel" data-i18n="checklisten.feedback.cancel">Abbrechen</button>
+                <button type="submit" className="btn-submit" data-i18n="checklisten.feedback.submit">Absenden</button>
+              </div>
+              <p className="form-msg" id="feedback-msg" />
+            </form>
+          </div>
+        </div>
+
+        <Footer />
+        <script src="/assets/checklisten-detail.js"></script>
+      </body>
+    </html>
+  );
+}
diff --git a/frontend/src/checklisten.tsx b/frontend/src/checklisten.tsx
new file mode 100644
index 0000000..eb18128
--- /dev/null
+++ b/frontend/src/checklisten.tsx
@@ -0,0 +1,44 @@
+import { h } from "./jsx";
+import { Sidebar } from "./components/Sidebar";
+import { Footer } from "./components/Footer";
+
+export function renderChecklisten(): string {
+  return "<!DOCTYPE html>" + (
+    <html lang="de">
+      <head>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <title data-i18n="checklisten.title">Checklisten &mdash; patHoLo</title>
+        <link rel="stylesheet" href="/assets/global.css" />
+      </head>
+      <body className="has-sidebar">
+        <Sidebar currentPath="/checklisten" />
+
+        <main>
+          <section className="tool-page">
+            <div className="container">
+              <div className="tool-header">
+                <h1 data-i18n="checklisten.heading">Checklisten</h1>
+                <p className="tool-subtitle" data-i18n="checklisten.subtitle">
+                  Interaktive Checklisten f&uuml;r typische Verfahrensschritte vor UPC, BPatG und EPA.
+                </p>
+              </div>
+
+              <div className="checklist-filters" id="checklist-filters">
+                <button className="filter-pill active" data-regime="all" type="button" data-i18n="checklisten.filter.all">Alle</button>
+                <button className="filter-pill" data-regime="UPC" type="button">UPC</button>
+                <button className="filter-pill" data-regime="DE" type="button" data-i18n="checklisten.filter.de">DE</button>
+                <button className="filter-pill" data-regime="EPA" type="button">EPA</button>
+              </div>
+
+              <div className="checklist-grid" id="checklist-grid" />
+            </div>
+          </section>
+        </main>
+
+        <Footer />
+        <script src="/assets/checklisten.js"></script>
+      </body>
+    </html>
+  );
+}
diff --git a/frontend/src/client/checklisten-detail.ts b/frontend/src/client/checklisten-detail.ts
new file mode 100644
index 0000000..9879282
--- /dev/null
+++ b/frontend/src/client/checklisten-detail.ts
@@ -0,0 +1,272 @@
+import { initI18n, onLangChange, t, getLang } from "./i18n";
+import { initSidebar } from "./sidebar";
+
+interface ChecklistItem {
+  labelDE: string;
+  labelEN: string;
+  noteDE?: string;
+  noteEN?: string;
+  rule?: string;
+}
+
+interface ChecklistGroup {
+  titleDE: string;
+  titleEN: string;
+  items: ChecklistItem[];
+}
+
+interface Checklist {
+  slug: string;
+  titleDE: string;
+  titleEN: string;
+  descriptionDE: string;
+  descriptionEN: string;
+  regime: string;
+  courtDE: string;
+  courtEN: string;
+  deadlineDE?: string;
+  deadlineEN?: string;
+  referenceDE?: string;
+  referenceEN?: string;
+  groups: ChecklistGroup[];
+}
+
+let checklist: Checklist | null = null;
+let state: Record<string, boolean> = {};
+
+function storageKey(slug: string): string {
+  return `patholo:checklist:${slug}`;
+}
+
+function esc(s: string): string {
+  const d = document.createElement("div");
+  d.textContent = s;
+  return d.innerHTML;
+}
+
+function itemKey(groupIdx: number, itemIdx: number): string {
+  return `g${groupIdx}-i${itemIdx}`;
+}
+
+function loadState() {
+  if (!checklist) return;
+  try {
+    const raw = localStorage.getItem(storageKey(checklist.slug));
+    state = raw ? (JSON.parse(raw) as Record<string, boolean>) : {};
+  } catch {
+    state = {};
+  }
+}
+
+function saveState() {
+  if (!checklist) return;
+  localStorage.setItem(storageKey(checklist.slug), JSON.stringify(state));
+}
+
+function totalItems(): number {
+  if (!checklist) return 0;
+  return checklist.groups.reduce((n, g) => n + g.items.length, 0);
+}
+
+function doneItems(): number {
+  return Object.values(state).filter(Boolean).length;
+}
+
+async function load() {
+  const slug = window.location.pathname.split("/").pop() ?? "";
+  const resp = await fetch(`/api/checklisten/${encodeURIComponent(slug)}`);
+  if (!resp.ok) {
+    document.title = "404 — patHoLo";
+    const title = document.getElementById("checklist-title")!;
+    title.textContent = t("checklisten.notfound");
+    return;
+  }
+  checklist = await resp.json();
+  loadState();
+  renderAll();
+}
+
+function renderAll() {
+  if (!checklist) return;
+  renderHeader();
+  renderGroups();
+  updateProgress();
+}
+
+function renderHeader() {
+  if (!checklist) return;
+  const isEN = getLang() === "en";
+  const title = isEN ? checklist.titleEN : checklist.titleDE;
+  const desc = isEN ? checklist.descriptionEN : checklist.descriptionDE;
+  const court = isEN ? checklist.courtEN : checklist.courtDE;
+  const deadline = isEN ? checklist.deadlineEN : checklist.deadlineDE;
+  const reference = isEN ? checklist.referenceEN : checklist.referenceDE;
+
+  document.title = `${title} — patHoLo`;
+  document.getElementById("checklist-title")!.textContent = title;
+  document.getElementById("checklist-subtitle")!.textContent = desc;
+
+  const courtLabel = isEN ? "Court / Authority" : "Gericht / Behörde";
+  const deadlineLabel = isEN ? "Deadline" : "Frist";
+  const refLabel = isEN ? "Reference" : "Rechtsgrundlage";
+  const regimeLabel = isEN ? "Regime" : "Bereich";
+
+  const parts: string[] = [];
+  parts.push(`<div class="checklist-meta-item"><dt>${regimeLabel}</dt><dd><span class="checklist-regime checklist-regime-${esc(checklist.regime)}">${esc(checklist.regime)}</span></dd></div>`);
+  parts.push(`<div class="checklist-meta-item"><dt>${courtLabel}</dt><dd>${esc(court)}</dd></div>`);
+  if (deadline) {
+    parts.push(`<div class="checklist-meta-item"><dt>${deadlineLabel}</dt><dd>${esc(deadline)}</dd></div>`);
+  }
+  if (reference) {
+    parts.push(`<div class="checklist-meta-item"><dt>${refLabel}</dt><dd>${esc(reference)}</dd></div>`);
+  }
+  document.getElementById("checklist-meta")!.innerHTML = parts.join("");
+}
+
+function renderGroups() {
+  if (!checklist) return;
+  const isEN = getLang() === "en";
+  const container = document.getElementById("checklist-groups")!;
+
+  container.innerHTML = checklist.groups.map((g, gi) => {
+    const groupTitle = isEN ? g.titleEN : g.titleDE;
+    const items = g.items.map((item, ii) => {
+      const key = itemKey(gi, ii);
+      const checked = !!state[key];
+      const label = isEN ? item.labelEN : item.labelDE;
+      const note = isEN ? item.noteEN : item.noteDE;
+      const rule = item.rule;
+
+      const noteHTML = note ? `<p class="checklist-item-note">${esc(note)}</p>` : "";
+      const ruleHTML = rule ? `<span class="checklist-item-rule">${esc(rule)}</span>` : "";
+
+      return `<li class="checklist-item${checked ? " checked" : ""}" data-key="${key}">
+        <label class="checklist-item-label">
+          <input type="checkbox" class="checklist-checkbox" data-key="${key}"${checked ? " checked" : ""} />
+          <span class="checklist-item-body">
+            <span class="checklist-item-row">
+              <span class="checklist-item-text">${esc(label)}</span>
+              ${ruleHTML}
+            </span>
+            ${noteHTML}
+          </span>
+        </label>
+      </li>`;
+    }).join("");
+
+    return `<section class="checklist-group">
+      <h2 class="checklist-group-title">${esc(groupTitle)}</h2>
+      <ol class="checklist-list">${items}</ol>
+    </section>`;
+  }).join("");
+
+  container.querySelectorAll<HTMLInputElement>(".checklist-checkbox").forEach((cb) => {
+    cb.addEventListener("change", () => {
+      const key = cb.dataset.key!;
+      state[key] = cb.checked;
+      saveState();
+      const li = cb.closest(".checklist-item");
+      if (li) li.classList.toggle("checked", cb.checked);
+      updateProgress();
+    });
+  });
+}
+
+function updateProgress() {
+  const total = totalItems();
+  const done = doneItems();
+  const pct = total === 0 ? 0 : Math.round((done / total) * 100);
+
+  const fill = document.getElementById("progress-fill");
+  if (fill) (fill as HTMLElement).style.width = `${pct}%`;
+
+  const label = document.getElementById("progress-label");
+  if (label) {
+    const doneLabel = getLang() === "en" ? "done" : "erledigt";
+    label.textContent = `${done} / ${total} ${doneLabel}`;
+  }
+}
+
+function initReset() {
+  document.getElementById("btn-reset")!.addEventListener("click", () => {
+    if (!checklist) return;
+    const ok = confirm(t("checklisten.reset.confirm"));
+    if (!ok) return;
+    state = {};
+    saveState();
+    renderGroups();
+    updateProgress();
+  });
+}
+
+function initPrint() {
+  document.getElementById("btn-print")!.addEventListener("click", () => {
+    window.print();
+  });
+}
+
+function initFeedback() {
+  const modal = document.getElementById("feedback-modal")!;
+  const form = document.getElementById("feedback-form")!;
+  const msg = document.getElementById("feedback-msg")!;
+
+  document.getElementById("btn-feedback")!.addEventListener("click", () => {
+    msg.textContent = "";
+    msg.className = "form-msg";
+    modal.style.display = "flex";
+  });
+
+  document.getElementById("modal-close")!.addEventListener("click", () => { modal.style.display = "none"; });
+  document.getElementById("modal-cancel")!.addEventListener("click", () => { modal.style.display = "none"; });
+  modal.addEventListener("click", (e) => { if (e.target === e.currentTarget) modal.style.display = "none"; });
+
+  form.addEventListener("submit", async (e) => {
+    e.preventDefault();
+    if (!checklist) return;
+    const submitBtn = form.querySelector(".btn-submit") as HTMLButtonElement;
+    const payload = {
+      feedback_type: (document.getElementById("feedback-type") as HTMLSelectElement).value,
+      checklist: checklist.slug,
+      message: (document.getElementById("feedback-message") as HTMLTextAreaElement).value.trim(),
+    };
+
+    if (!payload.message) {
+      msg.textContent = t("checklisten.feedback.error.required");
+      msg.className = "form-msg form-msg-error";
+      return;
+    }
+
+    submitBtn.disabled = true;
+    try {
+      const resp = await fetch("/api/checklisten/feedback", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(payload),
+      });
+      if (!resp.ok) {
+        msg.textContent = t("checklisten.feedback.error.generic");
+        msg.className = "form-msg form-msg-error";
+        return;
+      }
+      msg.textContent = t("checklisten.feedback.success");
+      msg.className = "form-msg form-msg-success";
+      (document.getElementById("feedback-message") as HTMLTextAreaElement).value = "";
+      setTimeout(() => { modal.style.display = "none"; }, 1500);
+    } catch {
+      msg.textContent = t("checklisten.feedback.error.generic");
+      msg.className = "form-msg form-msg-error";
+    } finally {
+      submitBtn.disabled = false;
+    }
+  });
+}
+
+document.addEventListener("DOMContentLoaded", () => {
+  initI18n();
+  initSidebar();
+  initReset();
+  initPrint();
+  initFeedback();
+  onLangChange(renderAll);
+  load();
+});
diff --git a/frontend/src/client/checklisten.ts b/frontend/src/client/checklisten.ts
new file mode 100644
index 0000000..de70575
--- /dev/null
+++ b/frontend/src/client/checklisten.ts
@@ -0,0 +1,104 @@
+import { initI18n, onLangChange, t, getLang } from "./i18n";
+import { initSidebar } from "./sidebar";
+
+interface ChecklistSummary {
+  slug: string;
+  titleDE: string;
+  titleEN: string;
+  descriptionDE: string;
+  descriptionEN: string;
+  regime: string;
+  courtDE: string;
+  courtEN: string;
+  itemCount: number;
+}
+
+let allChecklists: ChecklistSummary[] = [];
+let activeRegime = "all";
+
+function storageKey(slug: string): string {
+  return `patholo:checklist:${slug}`;
+}
+
+function progressFor(slug: string, total: number): { done: number; total: number } {
+  try {
+    const raw = localStorage.getItem(storageKey(slug));
+    if (!raw) return { done: 0, total };
+    const obj = JSON.parse(raw) as Record<string, boolean>;
+    const done = Object.values(obj).filter(Boolean).length;
+    return { done: Math.min(done, total), total };
+  } catch {
+    return { done: 0, total };
+  }
+}
+
+function esc(s: string): string {
+  const d = document.createElement("div");
+  d.textContent = s;
+  return d.innerHTML;
+}
+
+async function load() {
+  const resp = await fetch("/api/checklisten");
+  if (!resp.ok) return;
+  allChecklists = await resp.json();
+  render();
+}
+
+function render() {
+  const grid = document.getElementById("checklist-grid")!;
+  const isEN = getLang() === "en";
+
+  const filtered = activeRegime === "all"
+    ? allChecklists
+    : allChecklists.filter((c) => c.regime === activeRegime);
+
+  if (filtered.length === 0) {
+    grid.innerHTML = `<p class="checklist-empty" data-i18n="checklisten.empty">${t("checklisten.empty")}</p>`;
+    return;
+  }
+
+  grid.innerHTML = filtered.map((c) => {
+    const title = isEN ? c.titleEN : c.titleDE;
+    const desc = isEN ? c.descriptionEN : c.descriptionDE;
+    const court = isEN ? c.courtEN : c.courtDE;
+    const { done, total } = progressFor(c.slug, c.itemCount);
+    const pct = total === 0 ? 0 : Math.round((done / total) * 100);
+    const doneLabel = isEN ? "done" : "erledigt";
+    return `<a href="/checklisten/${esc(c.slug)}" class="checklist-card">
+      <div class="checklist-card-top">
+        <span class="checklist-regime checklist-regime-${esc(c.regime)}">${esc(c.regime)}</span>
+        <span class="checklist-card-count">${total} ${isEN ? "items" : "Punkte"}</span>
+      </div>
+      <h2 class="checklist-card-title">${esc(title)}</h2>
+      <p class="checklist-card-desc">${esc(desc)}</p>
+      <p class="checklist-card-court">${esc(court)}</p>
+      <div class="checklist-card-progress">
+        <div class="checklist-progress-bar">
+          <div class="checklist-progress-fill" style="width:${pct}%"></div>
+        </div>
+        <span class="checklist-progress-label">${done} / ${total} ${doneLabel}</span>
+      </div>
+    </a>`;
+  }).join("");
+}
+
+function initFilters() {
+  const container = document.getElementById("checklist-filters")!;
+  container.addEventListener("click", (e) => {
+    const btn = (e.target as HTMLElement).closest<HTMLButtonElement>(".filter-pill");
+    if (!btn) return;
+    container.querySelectorAll(".filter-pill").forEach((p) => p.classList.remove("active"));
+    btn.classList.add("active");
+    activeRegime = btn.dataset.regime ?? "all";
+    render();
+  });
+}
+
+document.addEventListener("DOMContentLoaded", () => {
+  initI18n();
+  initSidebar();
+  initFilters();
+  onLangChange(render);
+  load();
+});
diff --git a/frontend/src/client/i18n.ts b/frontend/src/client/i18n.ts
index 0519f0e..0ab4e28 100644
--- a/frontend/src/client/i18n.ts
+++ b/frontend/src/client/i18n.ts
@@ -18,6 +18,7 @@ const translations: Record<Lang, Record<string, string>> = {
     "nav.links": "Links",
     "nav.glossar": "Glossar",
     "nav.gebuehrentabellen": "Geb\u00fchrentabellen",
+    "nav.checklisten": "Checklisten",
     "nav.logout": "Abmelden",
 
     // Footer
@@ -275,6 +276,35 @@ const translations: Record<Lang, Record<string, string>> = {
     // Index — Geb\u00fchrentabellen card
     "index.gebuehren.title": "Geb\u00fchrentabellen",
     "index.gebuehren.desc": "Interaktive Geb\u00fchrentabellen f\u00fcr GKG, RVG, UPC, EPA und PatKostG. Streitwert eingeben, Geb\u00fchr ablesen.",
+
+    // Checklisten
+    "index.checklisten.title": "Checklisten",
+    "index.checklisten.desc": "Interaktive Checklisten f\u00fcr UPC-, DE- und EPA-Verfahren. Fortschritt wird lokal gespeichert.",
+    "checklisten.title": "Checklisten \u2014 patHoLo",
+    "checklisten.heading": "Checklisten",
+    "checklisten.subtitle": "Interaktive Checklisten f\u00fcr typische Verfahrensschritte vor UPC, BPatG und EPA. Abhaken, ausdrucken, kein Punkt vergessen.",
+    "checklisten.filter.all": "Alle",
+    "checklisten.filter.de": "DE",
+    "checklisten.empty": "Keine Checklisten in dieser Kategorie.",
+    "checklisten.back": "Zur\u00fcck zur \u00dcbersicht",
+    "checklisten.print": "Drucken",
+    "checklisten.reset": "Zur\u00fccksetzen",
+    "checklisten.reset.confirm": "Alle H\u00e4kchen dieser Checkliste wirklich zur\u00fccksetzen?",
+    "checklisten.notfound": "Checkliste nicht gefunden.",
+    "checklisten.disclaimer": "Hinweis: Diese Checklisten dienen als Ged\u00e4chtnisst\u00fctze und ersetzen keine Pr\u00fcfung im Einzelfall. Ma\u00dfgeblich sind die jeweils geltenden Verfahrensregeln.",
+    "checklisten.feedback.btn": "Feedback",
+    "checklisten.feedback.title": "Feedback zur Checkliste",
+    "checklisten.feedback.type": "Art",
+    "checklisten.feedback.error": "Fehler gefunden",
+    "checklisten.feedback.missing": "Fehlender Punkt",
+    "checklisten.feedback.suggestion": "Verbesserungsvorschlag",
+    "checklisten.feedback.other": "Sonstiges",
+    "checklisten.feedback.message": "Nachricht",
+    "checklisten.feedback.submit": "Absenden",
+    "checklisten.feedback.cancel": "Abbrechen",
+    "checklisten.feedback.success": "Danke f\u00fcr Ihr Feedback!",
+    "checklisten.feedback.error.required": "Bitte geben Sie eine Nachricht ein.",
+    "checklisten.feedback.error.generic": "Fehler beim Senden. Bitte versuchen Sie es erneut.",
   },
 
   en: {
@@ -286,6 +316,7 @@ const translations: Record<Lang, Record<string, string>> = {
     "nav.links": "Links",
     "nav.glossar": "Glossary",
     "nav.gebuehrentabellen": "Fee Schedules",
+    "nav.checklisten": "Checklists",
     "nav.logout": "Sign Out",
 
     // Footer
@@ -543,6 +574,35 @@ const translations: Record<Lang, Record<string, string>> = {
     // Index \u2014 Geb\u00fchrentabellen card
     "index.gebuehren.title": "Fee Schedules",
     "index.gebuehren.desc": "Interactive fee schedules for GKG, RVG, UPC, EPO, and PatKostG. Enter a dispute value, read the fee.",
+
+    // Checklisten
+    "index.checklisten.title": "Checklists",
+    "index.checklisten.desc": "Interactive filing checklists for UPC, German, and EPO proceedings. Progress is stored locally.",
+    "checklisten.title": "Checklists \u2014 patHoLo",
+    "checklisten.heading": "Checklists",
+    "checklisten.subtitle": "Interactive checklists for typical procedural steps before the UPC, German Patent Court, and EPO. Tick off, print, miss nothing.",
+    "checklisten.filter.all": "All",
+    "checklisten.filter.de": "DE",
+    "checklisten.empty": "No checklists in this category.",
+    "checklisten.back": "Back to overview",
+    "checklisten.print": "Print",
+    "checklisten.reset": "Reset",
+    "checklisten.reset.confirm": "Really reset all checkboxes for this checklist?",
+    "checklisten.notfound": "Checklist not found.",
+    "checklisten.disclaimer": "Note: These checklists are aides-memoire only and do not replace case-by-case review. The applicable procedural rules are controlling.",
+    "checklisten.feedback.btn": "Feedback",
+    "checklisten.feedback.title": "Checklist feedback",
+    "checklisten.feedback.type": "Type",
+    "checklisten.feedback.error": "Error found",
+    "checklisten.feedback.missing": "Missing item",
+    "checklisten.feedback.suggestion": "Improvement suggestion",
+    "checklisten.feedback.other": "Other",
+    "checklisten.feedback.message": "Message",
+    "checklisten.feedback.submit": "Submit",
+    "checklisten.feedback.cancel": "Cancel",
+    "checklisten.feedback.success": "Thank you for your feedback!",
+    "checklisten.feedback.error.required": "Please enter a message.",
+    "checklisten.feedback.error.generic": "Error submitting. Please try again.",
   },
 };
 
diff --git a/frontend/src/components/Sidebar.tsx b/frontend/src/components/Sidebar.tsx
index 5c8e1bb..df0541c 100644
--- a/frontend/src/components/Sidebar.tsx
+++ b/frontend/src/components/Sidebar.tsx
@@ -7,6 +7,7 @@ const ICON_DOWNLOAD = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor
 const ICON_LINK = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"/><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"/></svg>';
 const ICON_BOOK = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M4 19.5A2.5 2.5 0 0 1 6.5 17H20"/><path d="M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z"/></svg>';
 const ICON_TABLE = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><rect x="3" y="3" width="18" height="18" rx="2"/><line x1="3" y1="9" x2="21" y2="9"/><line x1="3" y1="15" x2="21" y2="15"/><line x1="9" y1="3" x2="9" y2="21"/></svg>';
+const ICON_CHECK = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M9 11l3 3L22 4"/><path d="M21 12v7a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11"/></svg>';
 const ICON_GLOBE = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><line x1="2" y1="12" x2="22" y2="12"/><path d="M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10A15.3 15.3 0 0 1 12 2z"/></svg>';
 const ICON_LOGOUT = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4"/><polyline points="16 17 21 12 16 7"/><line x1="21" y1="12" x2="9" y2="12"/></svg>';
 const ICON_PIN = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M9 4v6l-2 4h10l-2-4V4"/><line x1="12" y1="16" x2="12" y2="21"/><line x1="8" y1="4" x2="16" y2="4"/></svg>';
@@ -45,6 +46,7 @@ export function Sidebar({ currentPath }: SidebarProps): string {
           {navItem("/tools/kostenrechner", ICON_CALC, "nav.kostenrechner", "Kostenrechner", currentPath)}
           {navItem("/tools/fristenrechner", ICON_CLOCK, "nav.fristenrechner", "Fristenrechner", currentPath)}
           {navItem("/tools/gebuehrentabellen", ICON_TABLE, "nav.gebuehrentabellen", "Gebührentabellen", currentPath)}
+          {navItem("/checklisten", ICON_CHECK, "nav.checklisten", "Checklisten", currentPath)}
           {navItem("/glossar", ICON_BOOK, "nav.glossar", "Glossar", currentPath)}
           {navItem("/downloads", ICON_DOWNLOAD, "nav.downloads", "Downloads", currentPath)}
           {navItem("/links", ICON_LINK, "nav.links", "Links", currentPath)}
diff --git a/frontend/src/index.tsx b/frontend/src/index.tsx
index 80a3ecf..c150710 100644
--- a/frontend/src/index.tsx
+++ b/frontend/src/index.tsx
@@ -10,6 +10,7 @@ const ICON_CLOCK = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" s
 const ICON_DOWNLOAD = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>';
 const ICON_GLOSSAR = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M4 19.5A2.5 2.5 0 0 1 6.5 17H20"/><path d="M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z"/></svg>';
 const ICON_TABLE = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><rect x="3" y="3" width="18" height="18" rx="2"/><line x1="3" y1="9" x2="21" y2="9"/><line x1="3" y1="15" x2="21" y2="15"/><line x1="9" y1="3" x2="9" y2="21"/></svg>';
+const ICON_CHECK = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M9 11l3 3L22 4"/><path d="M21 12v7a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11"/></svg>';
 
 export function renderIndex(): string {
   return "<!DOCTYPE html>" + (
@@ -84,6 +85,12 @@ export function renderIndex(): string {
                   <h2 data-i18n="index.gebuehren.title">Geb&uuml;hrentabellen</h2>
                   <p data-i18n="index.gebuehren.desc">Interaktive Geb&uuml;hrentabellen f&uuml;r GKG, RVG, UPC, EPA und PatKostG. Streitwert eingeben, Geb&uuml;hr ablesen.</p>
                 </a>
+
+                <a href="/checklisten" className="card card-link">
+                  <div className="card-icon" dangerouslySetInnerHTML={{ __html: ICON_CHECK }} />
+                  <h2 data-i18n="index.checklisten.title">Checklisten</h2>
+                  <p data-i18n="index.checklisten.desc">Interaktive Checklisten f&uuml;r UPC-, DE- und EPA-Verfahren. Fortschritt wird lokal gespeichert.</p>
+                </a>
               </div>
             </div>
           </section>
diff --git a/frontend/src/styles/global.css b/frontend/src/styles/global.css
index 7396690..a285518 100644
--- a/frontend/src/styles/global.css
+++ b/frontend/src/styles/global.css
@@ -2804,3 +2804,382 @@ input[type="range"]::-moz-range-thumb {
         border: 1px solid #ccc;
     }
 }
+
+/* --- Checklisten --- */
+
+.checklist-filters {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 0.4rem;
+    margin-bottom: 1.5rem;
+}
+
+.checklist-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
+    gap: 1rem;
+}
+
+.checklist-card {
+    display: flex;
+    flex-direction: column;
+    gap: 0.6rem;
+    padding: 1.1rem 1.2rem 1.2rem;
+    border: 1px solid var(--color-border);
+    border-radius: var(--radius);
+    background: var(--color-surface);
+    text-decoration: none;
+    color: var(--color-text);
+    transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
+}
+
+.checklist-card:hover {
+    border-color: var(--color-accent);
+    transform: translateY(-1px);
+    box-shadow: var(--shadow-md);
+}
+
+.checklist-card-top {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 0.5rem;
+}
+
+.checklist-card-count {
+    font-size: 0.78rem;
+    color: var(--color-text-muted);
+}
+
+.checklist-card-title {
+    font-size: 1.05rem;
+    font-weight: 600;
+    line-height: 1.3;
+    margin: 0;
+}
+
+.checklist-card-desc {
+    color: var(--color-text-muted);
+    font-size: 0.88rem;
+    line-height: 1.5;
+    margin: 0;
+}
+
+.checklist-card-court {
+    font-size: 0.78rem;
+    color: var(--color-text-muted);
+    margin: 0;
+    font-style: italic;
+}
+
+.checklist-card-progress {
+    display: flex;
+    align-items: center;
+    gap: 0.6rem;
+    margin-top: 0.2rem;
+}
+
+.checklist-regime {
+    display: inline-block;
+    padding: 0.15rem 0.55rem;
+    border-radius: 99px;
+    font-size: 0.72rem;
+    font-weight: 600;
+    letter-spacing: 0.04em;
+    background: rgba(101, 163, 13, 0.12);
+    color: var(--color-accent);
+}
+
+.checklist-regime-UPC {
+    background: rgba(101, 163, 13, 0.12);
+    color: var(--color-accent);
+}
+
+.checklist-regime-DE {
+    background: rgba(26, 54, 93, 0.08);
+    color: #1b365d;
+}
+
+.checklist-regime-EPA {
+    background: rgba(100, 100, 122, 0.12);
+    color: var(--color-text-muted);
+}
+
+.checklist-empty {
+    color: var(--color-text-muted);
+    text-align: center;
+    padding: 2rem 1rem;
+    grid-column: 1 / -1;
+}
+
+/* --- Checklist detail --- */
+
+.checklist-back {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.4rem;
+    font-size: 0.85rem;
+    color: var(--color-text-muted);
+    text-decoration: none;
+    margin-bottom: 1rem;
+    transition: color 0.15s ease;
+}
+
+.checklist-back:hover {
+    color: var(--color-accent);
+}
+
+.checklist-back-arrow {
+    font-size: 1rem;
+}
+
+.checklist-detail-header {
+    margin-bottom: 1.5rem;
+}
+
+.checklist-detail-head-row {
+    display: flex;
+    align-items: flex-start;
+    justify-content: space-between;
+    gap: 1rem;
+    flex-wrap: wrap;
+}
+
+.checklist-actions {
+    display: flex;
+    gap: 0.5rem;
+    flex-wrap: wrap;
+    margin-top: 0.25rem;
+}
+
+.btn-ghost {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.4rem;
+    padding: 0.55rem 0.9rem;
+    font-size: 0.82rem;
+    font-weight: 500;
+    color: var(--color-text-muted);
+    background: var(--color-surface);
+    border: 1px solid var(--color-border);
+    border-radius: var(--radius);
+    cursor: pointer;
+    transition: all 0.15s ease;
+    font-family: var(--font-sans);
+}
+
+.btn-ghost:hover {
+    border-color: var(--color-accent);
+    color: var(--color-accent);
+}
+
+.checklist-meta {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 0.4rem 1.5rem;
+    margin-top: 0.85rem;
+    font-size: 0.82rem;
+}
+
+.checklist-meta-item {
+    display: flex;
+    flex-direction: column;
+    gap: 0.15rem;
+}
+
+.checklist-meta-item dt {
+    font-size: 0.7rem;
+    text-transform: uppercase;
+    letter-spacing: 0.06em;
+    color: var(--color-text-muted);
+    font-weight: 600;
+}
+
+.checklist-meta-item dd {
+    color: var(--color-text);
+    margin: 0;
+}
+
+.checklist-progress {
+    display: flex;
+    align-items: center;
+    gap: 0.75rem;
+    margin-top: 1.25rem;
+}
+
+.checklist-progress-bar {
+    flex: 1;
+    height: 0.4rem;
+    background: var(--color-border);
+    border-radius: 99px;
+    overflow: hidden;
+}
+
+.checklist-progress-fill {
+    height: 100%;
+    background: var(--color-accent);
+    border-radius: 99px;
+    transition: width 0.2s ease;
+    width: 0%;
+}
+
+.checklist-progress-label {
+    font-size: 0.8rem;
+    color: var(--color-text-muted);
+    font-variant-numeric: tabular-nums;
+    white-space: nowrap;
+}
+
+.checklist-groups {
+    display: flex;
+    flex-direction: column;
+    gap: 1.75rem;
+}
+
+.checklist-group-title {
+    font-size: 0.78rem;
+    font-weight: 600;
+    text-transform: uppercase;
+    letter-spacing: 0.06em;
+    color: var(--color-text-muted);
+    padding-bottom: 0.45rem;
+    border-bottom: 1px solid var(--color-border);
+    margin-bottom: 0.75rem;
+}
+
+.checklist-list {
+    list-style: none;
+    margin: 0;
+    padding: 0;
+    display: flex;
+    flex-direction: column;
+    gap: 0.3rem;
+}
+
+.checklist-item {
+    padding: 0.55rem 0.6rem;
+    border-radius: var(--radius);
+    transition: background 0.15s ease;
+}
+
+.checklist-item:hover {
+    background: rgba(101, 163, 13, 0.04);
+}
+
+.checklist-item.checked .checklist-item-text {
+    color: var(--color-text-muted);
+    text-decoration: line-through;
+}
+
+.checklist-item-label {
+    display: flex;
+    align-items: flex-start;
+    gap: 0.7rem;
+    cursor: pointer;
+}
+
+.checklist-checkbox {
+    width: 1.05rem;
+    height: 1.05rem;
+    margin-top: 0.2rem;
+    accent-color: var(--color-accent);
+    flex-shrink: 0;
+    cursor: pointer;
+}
+
+.checklist-item-body {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    gap: 0.2rem;
+}
+
+.checklist-item-row {
+    display: flex;
+    align-items: baseline;
+    gap: 0.6rem;
+    flex-wrap: wrap;
+}
+
+.checklist-item-text {
+    font-size: 0.92rem;
+    line-height: 1.5;
+    color: var(--color-text);
+}
+
+.checklist-item-rule {
+    font-size: 0.72rem;
+    padding: 0.1rem 0.45rem;
+    border-radius: 99px;
+    background: rgba(26, 54, 93, 0.06);
+    color: #1b365d;
+    font-family: var(--font-mono);
+    white-space: nowrap;
+}
+
+.checklist-item-note {
+    font-size: 0.8rem;
+    color: var(--color-text-muted);
+    line-height: 1.5;
+    margin: 0;
+}
+
+.checklist-print-footer {
+    margin-top: 2rem;
+    padding-top: 1rem;
+    border-top: 1px solid var(--color-border);
+}
+
+.checklist-disclaimer {
+    font-size: 0.75rem;
+    color: var(--color-text-muted);
+    line-height: 1.6;
+    margin: 0;
+}
+
+@media (max-width: 640px) {
+    .checklist-detail-head-row {
+        flex-direction: column;
+    }
+
+    .checklist-actions {
+        width: 100%;
+    }
+}
+
+@media print {
+    .checklist-back,
+    .checklist-actions,
+    .checklist-filters,
+    .checklist-card-progress {
+        display: none !important;
+    }
+
+    .checklist-item {
+        break-inside: avoid;
+        border-bottom: 1px dotted #ccc;
+        padding: 0.3rem 0;
+    }
+
+    .checklist-item:hover {
+        background: none;
+    }
+
+    .checklist-checkbox {
+        /* Keep checkbox visible with actual state */
+        accent-color: #000;
+    }
+
+    .checklist-group {
+        break-inside: avoid-page;
+        margin-bottom: 1rem;
+    }
+
+    .checklist-progress {
+        margin-top: 0.5rem;
+    }
+
+    .checklist-progress-bar {
+        display: none;
+    }
+}
diff --git a/internal/handlers/checklisten.go b/internal/handlers/checklisten.go
new file mode 100644
index 0000000..028de8f
--- /dev/null
+++ b/internal/handlers/checklisten.go
@@ -0,0 +1,510 @@
+package handlers
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"strings"
+	"time"
+
+	"mgit.msbls.de/m/patholo/internal/auth"
+)
+
+type ChecklistItem struct {
+	LabelDE string `json:"labelDE"`
+	LabelEN string `json:"labelEN"`
+	NoteDE  string `json:"noteDE,omitempty"`
+	NoteEN  string `json:"noteEN,omitempty"`
+	Rule    string `json:"rule,omitempty"`
+}
+
+type ChecklistGroup struct {
+	TitleDE string          `json:"titleDE"`
+	TitleEN string          `json:"titleEN"`
+	Items   []ChecklistItem `json:"items"`
+}
+
+type Checklist struct {
+	Slug           string           `json:"slug"`
+	TitleDE        string           `json:"titleDE"`
+	TitleEN        string           `json:"titleEN"`
+	DescriptionDE  string           `json:"descriptionDE"`
+	DescriptionEN  string           `json:"descriptionEN"`
+	Regime         string           `json:"regime"` // UPC | DE | EPA
+	CourtDE        string           `json:"courtDE"`
+	CourtEN        string           `json:"courtEN"`
+	DeadlineDE     string           `json:"deadlineDE,omitempty"`
+	DeadlineEN     string           `json:"deadlineEN,omitempty"`
+	ReferenceDE    string           `json:"referenceDE,omitempty"`
+	ReferenceEN    string           `json:"referenceEN,omitempty"`
+	Groups         []ChecklistGroup `json:"groups"`
+}
+
+type ChecklistSummary struct {
+	Slug          string `json:"slug"`
+	TitleDE       string `json:"titleDE"`
+	TitleEN       string `json:"titleEN"`
+	DescriptionDE string `json:"descriptionDE"`
+	DescriptionEN string `json:"descriptionEN"`
+	Regime        string `json:"regime"`
+	CourtDE       string `json:"courtDE"`
+	CourtEN       string `json:"courtEN"`
+	ItemCount     int    `json:"itemCount"`
+}
+
+type ChecklistFeedback struct {
+	FeedbackType string `json:"feedback_type"`
+	Checklist    string `json:"checklist"`
+	Message      string `json:"message"`
+}
+
+var checklists = []Checklist{
+	{
+		Slug:          "upc-statement-of-claim",
+		TitleDE:       "UPC Klageschrift",
+		TitleEN:       "UPC Statement of Claim",
+		DescriptionDE: "Pflichtbestandteile einer Klageschrift vor dem Einheitlichen Patentgericht.",
+		DescriptionEN: "Mandatory content of a statement of claim before the Unified Patent Court.",
+		Regime:        "UPC",
+		CourtDE:       "Einheitliches Patentgericht (Lokal-/Regional-/Zentralkammer)",
+		CourtEN:       "Unified Patent Court (local/regional/central division)",
+		ReferenceDE:   "RoP 13",
+		ReferenceEN:   "RoP 13",
+		Groups: []ChecklistGroup{
+			{
+				TitleDE: "Formale Angaben",
+				TitleEN: "Formal details",
+				Items: []ChecklistItem{
+					{LabelDE: "Bezeichnung der Parteien (inkl. Vertreter)", LabelEN: "Names and addresses of the parties (and representatives)", Rule: "RoP 13(1)(a)-(b)"},
+					{LabelDE: "Angabe der Lokal-, Regional- oder Zentralkammer", LabelEN: "Identification of the division where the action is brought", Rule: "RoP 13(1)(c)"},
+					{LabelDE: "Verfahrenssprache gewählt und ggf. begründet", LabelEN: "Language of proceedings selected and justified if required", Rule: "RoP 14"},
+					{LabelDE: "Anschrift für Zustellungen", LabelEN: "Address for service", Rule: "RoP 8.1, 13(1)(b)"},
+					{LabelDE: "Vollmacht bzw. Vertretungsnachweis des Prozessbevollmächtigten", LabelEN: "Evidence of representation / authorisation", NoteDE: "Art. 48 EPGÜ; Vertretung durch zugelassenen Rechtsanwalt oder EPA mit EPLC.", NoteEN: "Art. 48 UPCA; representation by authorised lawyer or EPA with EPLC."},
+				},
+			},
+			{
+				TitleDE: "Patent und Verletzung",
+				TitleEN: "Patent and infringement",
+				Items: []ChecklistItem{
+					{LabelDE: "Patentnummer und Angabe, ob Einheitspatent oder EP-Bündelpatent", LabelEN: "Patent number and indication whether unitary or classical EP", Rule: "RoP 13(1)(d)"},
+					{LabelDE: "Nachweis der Inhaberschaft / Aktivlegitimation", LabelEN: "Evidence of ownership / entitlement to sue", Rule: "RoP 13(1)(e)"},
+					{LabelDE: "Angriffsgegenstand (streitige Ausführungsform) konkret bezeichnet", LabelEN: "Identification of the contested embodiments", Rule: "RoP 13(1)(g)"},
+					{LabelDE: "Verletzungsargumentation mit Merkmalsgliederung", LabelEN: "Infringement analysis with feature-by-feature mapping", Rule: "RoP 13(1)(l)"},
+					{LabelDE: "Angabe von Hintergrund und Stand der Technik (soweit erforderlich)", LabelEN: "Relevant technical and factual background", Rule: "RoP 13(1)(k)"},
+				},
+			},
+			{
+				TitleDE: "Anträge und Streitwert",
+				TitleEN: "Relief sought and value",
+				Items: []ChecklistItem{
+					{LabelDE: "Konkrete Anträge (Unterlassung, Rückruf, Vernichtung, Schadensersatz, Auskunft)", LabelEN: "Orders sought (injunction, recall, destruction, damages, information)", Rule: "RoP 13(1)(p)"},
+					{LabelDE: "Streitwert und Begründung der Streitwertangabe", LabelEN: "Value of the action with reasoned indication", Rule: "RoP 13(1)(o), 370"},
+					{LabelDE: "Antrag zu den Kosten", LabelEN: "Request regarding costs", Rule: "RoP 13(1)(p)"},
+					{LabelDE: "Ggf. Antrag auf einstweilige Maßnahmen oder Beschleunigung", LabelEN: "If applicable: request for provisional or accelerated measures", Rule: "RoP 206, 118"},
+				},
+			},
+			{
+				TitleDE: "Zuständigkeit und Zulässigkeit",
+				TitleEN: "Jurisdiction and admissibility",
+				Items: []ChecklistItem{
+					{LabelDE: "Begründung der Zuständigkeit der gewählten Kammer", LabelEN: "Reasoned statement on competence of the chosen division", Rule: "Art. 33 EPGÜ / UPCA; RoP 13(1)(i)"},
+					{LabelDE: "Kein Opt-out des Patents (sofern klassisches EP)", LabelEN: "No opt-out in force (for classical EPs)", NoteDE: "Register des UPC prüfen.", NoteEN: "Check the UPC case management register."},
+					{LabelDE: "Keine parallele nationale Verletzungsklage ohne Abstimmung", LabelEN: "No parallel national infringement action without coordination"},
+				},
+			},
+			{
+				TitleDE: "Anlagen und Gebühren",
+				TitleEN: "Annexes and fees",
+				Items: []ChecklistItem{
+					{LabelDE: "Patentschrift (B-Schrift) und ggf. T3/Übersetzung", LabelEN: "Patent specification (B-publication) and translation if required"},
+					{LabelDE: "Übersetzung der Ansprüche in die Verfahrenssprache", LabelEN: "Translation of the claims into the language of proceedings", Rule: "RoP 14.2"},
+					{LabelDE: "Relevante Beweismittel (Produktunterlagen, Testberichte, Lizenzverträge)", LabelEN: "Supporting evidence (product materials, test reports, licence agreements)"},
+					{LabelDE: "Festgebühr und streitwertabhängige Gerichtsgebühr eingezahlt", LabelEN: "Fixed fee and value-based court fee paid", Rule: "RoP 15.2, Rules on Court Fees"},
+					{LabelDE: "Einreichung über CMS (elektronisch)", LabelEN: "Electronic filing via CMS", Rule: "RoP 4.1"},
+				},
+			},
+		},
+	},
+	{
+		Slug:          "upc-statement-of-defence",
+		TitleDE:       "UPC Klageerwiderung",
+		TitleEN:       "UPC Statement of Defence",
+		DescriptionDE: "Pflichtbestandteile der Klageerwiderung (mit optionaler Nichtigkeits-Widerklage).",
+		DescriptionEN: "Mandatory content of the statement of defence (with optional counterclaim for revocation).",
+		Regime:        "UPC",
+		CourtDE:       "Einheitliches Patentgericht",
+		CourtEN:       "Unified Patent Court",
+		DeadlineDE:    "3 Monate ab Zustellung der Klage",
+		DeadlineEN:    "3 months from service of the statement of claim",
+		ReferenceDE:   "RoP 23, 24, 25",
+		ReferenceEN:   "RoP 23, 24, 25",
+		Groups: []ChecklistGroup{
+			{
+				TitleDE: "Formale Angaben",
+				TitleEN: "Formal details",
+				Items: []ChecklistItem{
+					{LabelDE: "Aktenzeichen und Bezeichnung der Parteien", LabelEN: "Case number and names of the parties", Rule: "RoP 24(a)"},
+					{LabelDE: "Anschrift für Zustellungen und Vertretungsnachweis", LabelEN: "Address for service and evidence of representation", Rule: "RoP 24(b)-(c)"},
+					{LabelDE: "Einhaltung der 3-Monats-Frist", LabelEN: "Compliance with the 3-month deadline", Rule: "RoP 23", NoteDE: "Frist läuft ab Zustellung der Klageschrift.", NoteEN: "Runs from service of the statement of claim."},
+				},
+			},
+			{
+				TitleDE: "Inhaltliche Verteidigung",
+				TitleEN: "Substantive defence",
+				Items: []ChecklistItem{
+					{LabelDE: "Stellungnahme zu Zuständigkeit, Zulässigkeit und Sprache", LabelEN: "Position on competence, admissibility and language", Rule: "RoP 24(d)-(e)"},
+					{LabelDE: "Bestrittene und unbestrittene Tatsachen konkret benannt", LabelEN: "Indicate contested and uncontested facts", Rule: "RoP 24(g)"},
+					{LabelDE: "Gegenargumentation zur Verletzung (Merkmal für Merkmal)", LabelEN: "Non-infringement arguments (feature by feature)", Rule: "RoP 24(g)-(h)"},
+					{LabelDE: "Ggf. Einreden (Erschöpfung, Vorbenutzung, FRAND, Verjährung, private use)", LabelEN: "Defences raised (exhaustion, prior use, FRAND, statute of limitations, private use)", Rule: "Art. 27, 28 EPGÜ / UPCA"},
+				},
+			},
+			{
+				TitleDE: "Widerklage und Gegenanträge",
+				TitleEN: "Counterclaims and counter-requests",
+				Items: []ChecklistItem{
+					{LabelDE: "Ggf. Nichtigkeits-Widerklage mit separatem Antrag", LabelEN: "If applicable: counterclaim for revocation with separate request", Rule: "RoP 25"},
+					{LabelDE: "Bei Nichtigkeits-Widerklage: Nichtigkeitsgründe und Stand der Technik", LabelEN: "For revocation counterclaim: grounds for invalidity and prior art", Rule: "RoP 25.1(b)"},
+					{LabelDE: "Antrag zu Kosten und Sicherheitsleistung", LabelEN: "Request regarding costs and security"},
+				},
+			},
+			{
+				TitleDE: "Anlagen und Gebühren",
+				TitleEN: "Annexes and fees",
+				Items: []ChecklistItem{
+					{LabelDE: "Beweismittel für bestrittene Tatsachen", LabelEN: "Evidence for contested facts", Rule: "RoP 24(i)"},
+					{LabelDE: "Ggf. Gutachten, Entgegenhaltungen, Übersetzungen", LabelEN: "Expert opinions, prior art, translations if applicable"},
+					{LabelDE: "Gerichtsgebühr für Widerklage (bei Nichtigkeit)", LabelEN: "Court fee for counterclaim (if revocation)", Rule: "RoP 25.2"},
+					{LabelDE: "Einreichung über CMS", LabelEN: "Electronic filing via CMS"},
+				},
+			},
+		},
+	},
+	{
+		Slug:          "upc-confidentiality",
+		TitleDE:       "UPC Vertraulichkeitsantrag",
+		TitleEN:       "UPC Confidentiality Application",
+		DescriptionDE: "Antrag auf Schutz vertraulicher Informationen (z.B. Geschäftsgeheimnisse) im UPC-Verfahren.",
+		DescriptionEN: "Application for protection of confidential information (e.g. trade secrets) in UPC proceedings.",
+		Regime:        "UPC",
+		CourtDE:       "Einheitliches Patentgericht",
+		CourtEN:       "Unified Patent Court",
+		ReferenceDE:   "RoP 262A",
+		ReferenceEN:   "RoP 262A",
+		Groups: []ChecklistGroup{
+			{
+				TitleDE: "Antrag und Begründung",
+				TitleEN: "Request and reasoning",
+				Items: []ChecklistItem{
+					{LabelDE: "Konkreter Antrag zur Behandlung als vertraulich", LabelEN: "Specific request for confidential treatment", Rule: "RoP 262A.1"},
+					{LabelDE: "Bezeichnung der konkret betroffenen Informationen/Dokumente", LabelEN: "Identification of the specific information/documents concerned", Rule: "RoP 262A.2(a)"},
+					{LabelDE: "Begründung der Vertraulichkeit (Geschäftsgeheimnis, wirtschaftlicher Wert)", LabelEN: "Reasoned justification (trade secret, economic value)", Rule: "RoP 262A.2(b)"},
+					{LabelDE: "Beschreibung der potentiellen Nachteile bei Offenlegung", LabelEN: "Description of potential harm if disclosed"},
+				},
+			},
+			{
+				TitleDE: "Vertraulichkeitsklub",
+				TitleEN: "Confidentiality club",
+				Items: []ChecklistItem{
+					{LabelDE: "Vorschlag des Personenkreises mit Zugang (max. 1 natürliche Person je Partei + Vertreter)", LabelEN: "Proposed list of persons with access (min. one natural person per party plus representatives)", Rule: "RoP 262A.5"},
+					{LabelDE: "Geheimhaltungsverpflichtung für alle Klub-Mitglieder vorgesehen", LabelEN: "Confidentiality undertaking foreseen for all club members"},
+					{LabelDE: "Ggf. besondere Modalitäten (nur Einsicht vor Ort, keine Kopien)", LabelEN: "Specific modalities (on-site inspection only, no copies) if applicable"},
+				},
+			},
+			{
+				TitleDE: "Verfahrensrechtliche Aspekte",
+				TitleEN: "Procedural aspects",
+				Items: []ChecklistItem{
+					{LabelDE: "Zeitpunkt des Antrags (so früh wie möglich)", LabelEN: "Timing of the application (as early as possible)"},
+					{LabelDE: "Abstimmung mit Gegenpartei dokumentiert oder Gründe der Nichtabstimmung", LabelEN: "Coordination with opposing party documented or reasons for absence"},
+					{LabelDE: "Geschwärzte und ungeschwärzte Fassungen der Dokumente vorbereitet", LabelEN: "Redacted and unredacted versions of documents prepared"},
+					{LabelDE: "Verhältnismäßigkeit geprüft (Art. 9 Know-how-RL)", LabelEN: "Proportionality considered (Art. 9 Trade Secrets Directive)"},
+				},
+			},
+		},
+	},
+	{
+		Slug:          "upc-representative-registration",
+		TitleDE:       "UPC Vertreterregistrierung",
+		TitleEN:       "UPC Representative Registration",
+		DescriptionDE: "Unterlagen für die Eintragung als zugelassener Vertreter vor dem UPC.",
+		DescriptionEN: "Documents required to be registered as a qualified representative before the UPC.",
+		Regime:        "UPC",
+		CourtDE:       "Kanzlei des UPC / Registrar",
+		CourtEN:       "UPC Registry",
+		ReferenceDE:   "Art. 48 EPGÜ; RoP 286 ff.",
+		ReferenceEN:   "Art. 48 UPCA; RoP 286 et seq.",
+		Groups: []ChecklistGroup{
+			{
+				TitleDE: "Rechtsanwälte (Art. 48(1))",
+				TitleEN: "Lawyers (Art. 48(1))",
+				Items: []ChecklistItem{
+					{LabelDE: "Nachweis der Zulassung als Rechtsanwalt in einem teilnehmenden Mitgliedstaat", LabelEN: "Proof of authorisation as a lawyer in a contracting member state", NoteDE: "Aktuelle Zulassungsbescheinigung der zuständigen Kammer.", NoteEN: "Recent certificate from the competent bar association."},
+					{LabelDE: "Aktuelle Registerauskunft (nicht älter als 3 Monate)", LabelEN: "Up-to-date bar register extract (not older than 3 months)"},
+					{LabelDE: "Berufshaftpflichtversicherung nachgewiesen", LabelEN: "Professional indemnity insurance evidenced"},
+				},
+			},
+			{
+				TitleDE: "Patentanwälte (Art. 48(2))",
+				TitleEN: "European patent attorneys (Art. 48(2))",
+				Items: []ChecklistItem{
+					{LabelDE: "Eintragung in der Liste der zugelassenen Vertreter beim EPA", LabelEN: "Entry on the EPO list of professional representatives"},
+					{LabelDE: "EPLC oder gleichwertige Qualifikation (Art. 48(2))", LabelEN: "European Patent Litigation Certificate (EPLC) or equivalent"},
+					{LabelDE: "Nachweis der Qualifikation (Zeugnis / Bescheinigung)", LabelEN: "Evidence of qualification (certificate)"},
+				},
+			},
+			{
+				TitleDE: "Allgemeine Unterlagen",
+				TitleEN: "General documents",
+				Items: []ChecklistItem{
+					{LabelDE: "Ausgefülltes UPC-Registrierungsformular", LabelEN: "Completed UPC registration form"},
+					{LabelDE: "Gültige Ausweiskopie", LabelEN: "Valid identity document copy"},
+					{LabelDE: "Zustellungsadresse (in einem Mitgliedstaat)", LabelEN: "Address for service (in a contracting member state)"},
+					{LabelDE: "CMS-Account erstellt und Starke-Authentifizierung eingerichtet", LabelEN: "CMS account created and strong authentication configured"},
+					{LabelDE: "Bankverbindung für Gebührenzahlungen hinterlegt", LabelEN: "Bank details lodged for fee payments"},
+				},
+			},
+		},
+	},
+	{
+		Slug:          "bpatg-nullity-action",
+		TitleDE:       "Nichtigkeitsklage BPatG",
+		TitleEN:       "Patent Nullity Action (BPatG)",
+		DescriptionDE: "Formale und inhaltliche Anforderungen an eine Nichtigkeitsklage vor dem Bundespatentgericht.",
+		DescriptionEN: "Formal and substantive requirements for a nullity action before the German Federal Patent Court.",
+		Regime:        "DE",
+		CourtDE:       "Bundespatentgericht, München",
+		CourtEN:       "Federal Patent Court (BPatG), Munich",
+		ReferenceDE:   "§§ 81 ff. PatG",
+		ReferenceEN:   "Sections 81 et seq. Patent Act (PatG)",
+		Groups: []ChecklistGroup{
+			{
+				TitleDE: "Formale Anforderungen",
+				TitleEN: "Formal requirements",
+				Items: []ChecklistItem{
+					{LabelDE: "Bezeichnung der Parteien (Kläger, Beklagter = Patentinhaber)", LabelEN: "Names of the parties (claimant, defendant = patent proprietor)", Rule: "§ 253 ZPO i.V.m. § 99 PatG"},
+					{LabelDE: "Vertretung durch zugelassenen Rechts- oder Patentanwalt", LabelEN: "Representation by admitted attorney-at-law or patent attorney", Rule: "§ 97 PatG"},
+					{LabelDE: "Schriftform und Unterschrift des Bevollmächtigten", LabelEN: "Written form and signature of the representative"},
+					{LabelDE: "Zustellungsbevollmächtigter bei Auslandssitz", LabelEN: "Address for service in Germany if abroad"},
+				},
+			},
+			{
+				TitleDE: "Inhaltliche Anforderungen",
+				TitleEN: "Substantive requirements",
+				Items: []ChecklistItem{
+					{LabelDE: "Bezeichnung des angegriffenen Patents (Nummer, ggf. Teil)", LabelEN: "Identification of the challenged patent (number, part)", Rule: "§ 81(1) PatG"},
+					{LabelDE: "Antrag auf Nichtigerklärung (ganz oder teilweise)", LabelEN: "Request for full or partial revocation", Rule: "§ 81(1) PatG"},
+					{LabelDE: "Nichtigkeitsgründe konkret benannt", LabelEN: "Specific grounds for invalidity", Rule: "§ 22(1), § 81(1) PatG", NoteDE: "Mangelnde Patentfähigkeit (§§ 1-5), unzureichende Offenbarung (§ 21(1) Nr. 2), widerrechtliche Entnahme, unzulässige Erweiterung.", NoteEN: "Lack of patentability, insufficient disclosure, unlawful usurpation, impermissible extension."},
+					{LabelDE: "Tatsachen und Beweismittel für jeden Nichtigkeitsgrund", LabelEN: "Facts and evidence for each ground"},
+					{LabelDE: "Substantiierte Merkmalsgliederung und Vergleich mit Stand der Technik", LabelEN: "Substantiated feature analysis and comparison with prior art"},
+				},
+			},
+			{
+				TitleDE: "Zulässigkeit",
+				TitleEN: "Admissibility",
+				Items: []ChecklistItem{
+					{LabelDE: "Keine parallele Einspruchsfrist am EPA offen (Sperrwirkung)", LabelEN: "No pending opposition period at the EPO (blocking effect)", Rule: "§ 81(2) PatG"},
+					{LabelDE: "Klageberechtigung (Popularklage bei PatG ja, außer bei Usurpation)", LabelEN: "Standing to sue (popularis action permitted except for usurpation)", Rule: "§ 81(3) PatG"},
+					{LabelDE: "Streitwert angegeben und begründet", LabelEN: "Value in dispute indicated and reasoned"},
+				},
+			},
+			{
+				TitleDE: "Anlagen und Gebühren",
+				TitleEN: "Annexes and fees",
+				Items: []ChecklistItem{
+					{LabelDE: "Patentschrift des angegriffenen Patents", LabelEN: "Specification of the challenged patent"},
+					{LabelDE: "Entgegenhaltungen vollständig vorgelegt und ggf. übersetzt", LabelEN: "Prior art documents submitted in full, with translations if needed"},
+					{LabelDE: "Vollmacht", LabelEN: "Power of attorney"},
+					{LabelDE: "Gerichtsgebühr (4,5-facher Gebührensatz PatKostG) gezahlt", LabelEN: "Court fee (4.5x GKG rate, PatKostG) paid", Rule: "GebVerz. PatKostG Nr. 401300"},
+					{LabelDE: "Zahl der Abschriften für Beklagte(n) + 1", LabelEN: "Copies for defendant(s) plus one"},
+				},
+			},
+		},
+	},
+	{
+		Slug:          "epa-opposition",
+		TitleDE:       "EPA Einspruch",
+		TitleEN:       "EPO Opposition",
+		DescriptionDE: "Formvorschriften und Frist für einen Einspruch gegen ein erteiltes europäisches Patent.",
+		DescriptionEN: "Formal requirements and deadline for an opposition against a granted European patent.",
+		Regime:        "EPA",
+		CourtDE:       "Europäisches Patentamt, Einspruchsabteilung",
+		CourtEN:       "European Patent Office, Opposition Division",
+		DeadlineDE:    "9 Monate nach Veröffentlichung des Erteilungshinweises",
+		DeadlineEN:    "9 months after publication of the mention of grant",
+		ReferenceDE:   "Art. 99 EPÜ; Regel 76 EPÜ",
+		ReferenceEN:   "Art. 99 EPC; Rule 76 EPC",
+		Groups: []ChecklistGroup{
+			{
+				TitleDE: "Frist und Einreichung",
+				TitleEN: "Deadline and filing",
+				Items: []ChecklistItem{
+					{LabelDE: "9-Monats-Frist ab B-Schriften-Veröffentlichung eingehalten", LabelEN: "9-month deadline from B-publication met", Rule: "Art. 99(1) EPÜ / EPC", NoteDE: "Nicht verlängerbar; Wiedereinsetzung nur eng begrenzt möglich.", NoteEN: "Not extendable; re-establishment only in narrow circumstances."},
+					{LabelDE: "Einreichung über EPA Online Filing / MyEPO", LabelEN: "Filed via EPO Online Filing / MyEPO"},
+					{LabelDE: "Eingangstag dokumentiert und Einhaltung der Frist geprüft", LabelEN: "Filing receipt saved and deadline compliance verified"},
+				},
+			},
+			{
+				TitleDE: "Parteien und Vertretung",
+				TitleEN: "Parties and representation",
+				Items: []ChecklistItem{
+					{LabelDE: "Bezeichnung des Einsprechenden (Name, Anschrift, Staat)", LabelEN: "Identification of the opponent (name, address, state)", Rule: "Regel 76(2)(a) EPÜ / EPC"},
+					{LabelDE: "Vertretung durch zugelassenen Vertreter oder Rechtsanwalt", LabelEN: "Representation by professional representative or lawyer", Rule: "Art. 134 EPÜ / EPC"},
+					{LabelDE: "Vollmacht (soweit erforderlich)", LabelEN: "Power of attorney (where required)"},
+				},
+			},
+			{
+				TitleDE: "Angriff auf das Patent",
+				TitleEN: "Attack on the patent",
+				Items: []ChecklistItem{
+					{LabelDE: "Bezeichnung des angegriffenen europäischen Patents (Nummer, Erteilungsdatum)", LabelEN: "Identification of the challenged European patent (number, grant date)", Rule: "Regel 76(2)(b) EPÜ / EPC"},
+					{LabelDE: "Umfang des Einspruchs (vollständig / teilweise, Anspruchsnummern)", LabelEN: "Extent of opposition (full / partial, claim numbers)", Rule: "Regel 76(2)(c) EPÜ / EPC"},
+					{LabelDE: "Einspruchsgründe (Art. 100 EPÜ) konkret genannt", LabelEN: "Grounds of opposition under Art. 100 EPC stated", NoteDE: "a) mangelnde Patentfähigkeit, b) unzureichende Offenbarung, c) unzulässige Erweiterung.", NoteEN: "a) lack of patentability, b) insufficient disclosure, c) impermissible amendment."},
+					{LabelDE: "Tatsachen und Beweismittel je Einspruchsgrund substantiiert", LabelEN: "Substantiated facts and evidence for each ground", Rule: "Regel 76(2)(c) EPÜ / EPC"},
+				},
+			},
+			{
+				TitleDE: "Anlagen und Gebühr",
+				TitleEN: "Annexes and fee",
+				Items: []ChecklistItem{
+					{LabelDE: "Entgegenhaltungen vollständig und (soweit nötig) in Amtssprache", LabelEN: "Prior art fully submitted and, if necessary, translated into an official language"},
+					{LabelDE: "Ggf. Gutachten oder eidesstattliche Erklärungen beigefügt", LabelEN: "Expert opinions or affidavits included where appropriate"},
+					{LabelDE: "Einspruchsgebühr fristgerecht entrichtet", LabelEN: "Opposition fee paid in time", Rule: "Art. 99(1) EPÜ / EPC; Art. 2(1) GebO / RFees"},
+					{LabelDE: "Identifizierung der Sprache (Regel 3 EPÜ) beachtet", LabelEN: "Compliant language of proceedings (Rule 3 EPC)", Rule: "Regel 3 EPÜ / EPC"},
+				},
+			},
+		},
+	},
+}
+
+func totalItemCount(c Checklist) int {
+	n := 0
+	for _, g := range c.Groups {
+		n += len(g.Items)
+	}
+	return n
+}
+
+func findChecklist(slug string) (Checklist, bool) {
+	for _, c := range checklists {
+		if c.Slug == slug {
+			return c, true
+		}
+	}
+	return Checklist{}, false
+}
+
+func handleChecklistenPage(w http.ResponseWriter, r *http.Request) {
+	http.ServeFile(w, r, "dist/checklisten.html")
+}
+
+func handleChecklistDetailPage(w http.ResponseWriter, r *http.Request) {
+	slug := r.PathValue("slug")
+	if _, ok := findChecklist(slug); !ok {
+		http.NotFound(w, r)
+		return
+	}
+	http.ServeFile(w, r, "dist/checklisten-detail.html")
+}
+
+func handleChecklistenAPI(w http.ResponseWriter, r *http.Request) {
+	summaries := make([]ChecklistSummary, 0, len(checklists))
+	for _, c := range checklists {
+		summaries = append(summaries, ChecklistSummary{
+			Slug:          c.Slug,
+			TitleDE:       c.TitleDE,
+			TitleEN:       c.TitleEN,
+			DescriptionDE: c.DescriptionDE,
+			DescriptionEN: c.DescriptionEN,
+			Regime:        c.Regime,
+			CourtDE:       c.CourtDE,
+			CourtEN:       c.CourtEN,
+			ItemCount:     totalItemCount(c),
+		})
+	}
+	writeJSON(w, http.StatusOK, summaries)
+}
+
+func handleChecklistAPI(w http.ResponseWriter, r *http.Request) {
+	slug := r.PathValue("slug")
+	c, ok := findChecklist(slug)
+	if !ok {
+		writeJSON(w, http.StatusNotFound, map[string]string{"error": "Checkliste nicht gefunden."})
+		return
+	}
+	writeJSON(w, http.StatusOK, c)
+}
+
+func handleChecklistenFeedback(w http.ResponseWriter, r *http.Request) {
+	var feedback ChecklistFeedback
+	if err := json.NewDecoder(r.Body).Decode(&feedback); err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "Ungültige Anfrage."})
+		return
+	}
+
+	feedback.FeedbackType = strings.TrimSpace(feedback.FeedbackType)
+	feedback.Checklist = strings.TrimSpace(feedback.Checklist)
+	feedback.Message = strings.TrimSpace(feedback.Message)
+
+	if feedback.Message == "" || feedback.FeedbackType == "" {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "Nachricht und Art sind erforderlich."})
+		return
+	}
+
+	accessToken := ""
+	email := ""
+	if cookie, err := r.Cookie(auth.SessionCookieName); err == nil {
+		accessToken = cookie.Value
+		email = extractEmailFromJWT(cookie.Value)
+	}
+
+	payload := map[string]string{
+		"feedback_type": feedback.FeedbackType,
+		"checklist":     feedback.Checklist,
+		"message":       feedback.Message,
+		"submitted_by":  email,
+	}
+
+	jsonBody, err := json.Marshal(payload)
+	if err != nil {
+		log.Printf("checklisten feedback marshal error: %v", err)
+		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": "Interner Fehler."})
+		return
+	}
+
+	endpoint := fmt.Sprintf("%s/rest/v1/checklisten_feedback", authClient.URL)
+	req2, err := http.NewRequest("POST", endpoint, bytes.NewReader(jsonBody))
+	if err != nil {
+		log.Printf("checklisten feedback request error: %v", err)
+		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": "Interner Fehler."})
+		return
+	}
+	req2.Header.Set("Content-Type", "application/json")
+	req2.Header.Set("apikey", authClient.AnonKey)
+	if accessToken != "" {
+		req2.Header.Set("Authorization", "Bearer "+accessToken)
+	} else {
+		req2.Header.Set("Authorization", "Bearer "+authClient.AnonKey)
+	}
+	req2.Header.Set("Prefer", "return=minimal")
+
+	client := &http.Client{Timeout: 5 * time.Second}
+	resp, err := client.Do(req2)
+	if err != nil {
+		log.Printf("checklisten feedback supabase error: %v", err)
+		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": "Fehler beim Speichern."})
+		return
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 300 {
+		body, _ := io.ReadAll(resp.Body)
+		log.Printf("checklisten feedback supabase status %d: %s", resp.StatusCode, string(body))
+		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": "Fehler beim Speichern."})
+		return
+	}
+
+	writeJSON(w, http.StatusCreated, map[string]string{"ok": "true"})
+}
diff --git a/internal/handlers/handlers.go b/internal/handlers/handlers.go
index b341863..ab01a76 100644
--- a/internal/handlers/handlers.go
+++ b/internal/handlers/handlers.go
@@ -47,6 +47,11 @@ func Register(mux *http.ServeMux, client *auth.Client, giteaAPIToken string) {
 	protected.HandleFunc("GET /api/tools/gebuehrentabellen", handleGebuehrentabellenAPI)
 	protected.HandleFunc("GET /api/tools/gebuehrentabellen/lookup", handleGebuehrentabellenLookup)
 	protected.HandleFunc("POST /api/tools/gebuehrentabellen/feedback", handleGebuehrentabellenFeedback)
+	protected.HandleFunc("GET /checklisten", handleChecklistenPage)
+	protected.HandleFunc("GET /checklisten/{slug}", handleChecklistDetailPage)
+	protected.HandleFunc("GET /api/checklisten", handleChecklistenAPI)
+	protected.HandleFunc("GET /api/checklisten/{slug}", handleChecklistAPI)
+	protected.HandleFunc("POST /api/checklisten/feedback", handleChecklistenFeedback)
 	mux.Handle("/", client.Middleware(protected))
 }