First draft.

assets/js/cookie-consent.js

@@ -0,0 +1,51 @@
+(function () {
+  var KEY = 'cookie_consent';
+  var banner = document.getElementById('cookie-banner');
+  if (!banner) return;
+  updateStatus();
+
+  var consent = localStorage.getItem(KEY);
+  if (!consent) banner.style.display = 'flex';
+
+  function dismiss() {
+    banner.classList.add('fade-out');
+    setTimeout(function () { banner.style.display = 'none'; }, 500);
+  }
+
+  function updateStatus() {
+    var el = document.getElementById('cookie-status');
+    if (!el) return;
+    var consent = localStorage.getItem(KEY);
+    el.textContent = consent === 'accepted' ? el.dataset.accepted
+                  : consent === 'declined' ? el.dataset.declined
+                  : el.dataset.none;
+  }
+
+  document.getElementById('cookie-accept').onclick = function () {
+    localStorage.setItem(KEY, 'accepted');
+    updateStatus();
+    dismiss();
+    window.dispatchEvent(new Event('cookieAccepted'));
+  };
+
+  document.getElementById('cookie-decline').onclick = function () {
+    localStorage.setItem(KEY, 'declined');
+    updateStatus();
+    dismiss();
+  };
+
+  window.reopenCookieBanner = function () {
+    localStorage.removeItem(KEY);
+    updateStatus();
+    banner.classList.remove('fade-out');
+    banner.style.display = 'flex';
+  };
+
+  window.addEventListener('cookieAccepted', function () {
+    if (typeof window.trackVisit === 'function') window.trackVisit();
+  });
+  
+  if (localStorage.getItem(KEY) === 'accepted') {
+    if (typeof window.trackVisit === 'function') window.trackVisit();
+  }
+})();

assets/js/tracker-code.js

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+(function () {
+  function trackVisit() {
+    var banner = document.getElementById('cookie_banner');
+    if (!banner) return;
+    var matomoUrl = banner.dataset.matomoUrl;
+    var siteId = banner.dataset.matomoSiteId;
+    if (!matomoUrl || !siteId) return;
+
+    var _paq = window._paq = window._paq || [];
+    _paq.push(['trackPageView']);
+    _paq.push(['enableLinkTracking']);
+    _paq.push(['setTrackerUrl', matomoUrl + 'matomo.php']);
+    _paq.push(['setSiteId', siteId]);
+    var d = document, g = d.createElement('script'),
+        s = d.getElementsByTagName('script')[0];
+    g.async = true; g.src = matomoUrl + 'matomo.js';
+    s.parentNode.insertBefore(g, s);
+  }
+
+  window.addEventListener('cookieAccepted', trackVisit);
+  if (localStorage.getItem('cookie_consent') === 'accepted') {
+    trackVisit();
+  }
+})();

assets/scss/cookie-consent.scss

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+#cookie-banner {
+  position: fixed;
+  top: 2.5rem;
+  left: 50%;
+  transform: translateX(-50%);
+  width: min(480px, calc(100vw - 2rem));
+  background: #fff;
+  border: 1px solid #e2e2e2;
+  border-radius: 12px;
+  padding: 1rem 1.25rem;
+  box-shadow: 0 4px 24px rgba(0,0,0,.08);
+  display: flex;
+  align-items: center;
+  gap: 1rem;
+  z-index: 9999;
+  transition: opacity 0.5s ease;
+}
+
+#cookie-banner.fade-out {
+  opacity: 0;
+  pointer-events: none;
+}
+
+#cookie-banner p { margin: 0; font-size: 14px; flex: 1; }
+
+#cookie-banner button {
+  margin: 0.1rem 0;
+  padding: .45rem 1rem;
+  border-radius: 8px;
+  border: 1px solid #ccc;
+  cursor: pointer;
+  font-size: 13px;
+  white-space: nowrap;
+}
+
+#cookie-accept {
+  background: #0b913a; color: #fff; border-color: #1a1a1a;
+}
+