diff --git a/tasks/enduro-trails/TEST_CASES_UI_TERRAIN_EXT.md b/tasks/enduro-trails/TEST_CASES_UI_TERRAIN_EXT.md
new file mode 100644
index 0000000..bd3ea92
--- /dev/null
+++ b/tasks/enduro-trails/TEST_CASES_UI_TERRAIN_EXT.md
@@ -0,0 +1,45 @@
+# UI Test Cases: Terrain — Расширенные
+
+### TC-T-07 — Гипсометрия на зуме 10
+**Тип:** ui
+**Viewport:** desktop
+**URL:** https://openclaw.mva154.duckdns.org/enduro/#10/55.75/37.6
+
+**Шаги:**
+1. navigate: https://openclaw.mva154.duckdns.org/enduro/#10/55.75/37.6
+2. wait: 5000
+3. click: "#terrain-toggle"
+4. wait: 500
+5. click: "#terrain-hypso-cb"
+6. wait: 5000
+7. screenshot: "hypso-zoom10"
+8. check-visual: "Гипсометрия включена на зуме 10. Должен быть виден цветной полупрозрачный слой (зелёные тона для равнины ЦФО) поверх базовой карты."
+
+**Визуальные критерии:**
+- Цветной overlay виден на карте
+- Зелёные/жёлтые тона рельефа
+- Карта под overlay читаема
+
+---
+
+### TC-T-08 — Hillshade на зуме 11
+**Тип:** ui
+**Viewport:** desktop
+**URL:** https://openclaw.mva154.duckdns.org/enduro/#11/55.75/37.6
+
+**Шаги:**
+1. navigate: https://openclaw.mva154.duckdns.org/enduro/#11/55.75/37.6
+2. wait: 5000
+3. click: "#terrain-toggle"
+4. wait: 500
+5. click: "#terrain-hypso-cb"
+6. wait: 1000
+7. click: "#terrain-hillshade-cb"
+8. wait: 5000
+9. screenshot: "hillshade-zoom11"
+10. check-visual: "Оба слоя включены на зуме 11: гипсометрия (цвет) + отмывка (тени). Должны быть видны тени на склонах рельефа."
+
+**Визуальные критерии:**
+- Цветной overlay + тени видны
+- Рельеф выглядит объёмным
+- Нет чёрных/белых артефактов
diff --git a/tasks/enduro-trails/prototype/static/app.js b/tasks/enduro-trails/prototype/static/app.js
index c5e0a09..27975da 100644
--- a/tasks/enduro-trails/prototype/static/app.js
+++ b/tasks/enduro-trails/prototype/static/app.js
@@ -2623,3 +2623,168 @@ function initMiniRouteInteraction() {
     selectRoute(activeRouteIdx);
   });
 }
+
+// ═══════════════════════════════════════════
+// TERRAIN LAYERS (Phase 5.4)
+// ═══════════════════════════════════════════
+
+const TERRAIN_BASE_URL = window.location.pathname.replace(/\/[^/]*$/, '') + '/terrain';
+
+function toggleTerrainPopup() {
+  const popup = document.getElementById('terrain-popup');
+  const btn = document.getElementById('terrain-toggle');
+  if (!popup || !btn) return;
+  
+  const isVisible = popup.style.display !== 'none';
+  popup.style.display = isVisible ? 'none' : 'block';
+  btn.classList.toggle('active', !isVisible);
+  
+  // Close on outside click
+  if (!isVisible) {
+    setTimeout(() => {
+      document.addEventListener('click', closeTerrainOnOutside);
+    }, 10);
+  } else {
+    document.removeEventListener('click', closeTerrainOnOutside);
+  }
+}
+
+function closeTerrainOnOutside(e) {
+  const popup = document.getElementById('terrain-popup');
+  const btn = document.getElementById('terrain-toggle');
+  if (!popup.contains(e.target) && e.target !== btn && !btn.contains(e.target)) {
+    popup.style.display = 'none';
+    btn.classList.remove('active');
+    document.removeEventListener('click', closeTerrainOnOutside);
+  }
+}
+
+function onTerrainCheckbox() {
+  const map = window._map;
+  if (!map) return;
+  
+  const hypsoChecked = document.getElementById('terrain-hypso-cb').checked;
+  const hillshadeChecked = document.getElementById('terrain-hillshade-cb').checked;
+  
+  // Save state
+  localStorage.setItem('terrain-hypso', hypsoChecked ? '1' : '0');
+  localStorage.setItem('terrain-hillshade', hillshadeChecked ? '1' : '0');
+  
+  // Update button active state
+  const btn = document.getElementById('terrain-toggle');
+  btn.classList.toggle('active', hypsoChecked || hillshadeChecked);
+  
+  // Apply layers
+  applyTerrainLayer('terrain-hypso', TERRAIN_BASE_URL + '/hypso/{z}/{x}/{y}.png', hypsoChecked, 0.55, 5, 15);
+  applyTerrainLayer('terrain-hillshade', TERRAIN_BASE_URL + '/hillshade/{z}/{x}/{y}.png', hillshadeChecked, 0.40, 10, 15);
+}
+
+function applyTerrainLayer(id, tileUrl, enabled, opacity, minzoom, maxzoom) {
+  const map = window._map;
+  if (!map) return;
+  
+  const sourceId = id + '-source';
+  
+  if (enabled) {
+    // Add source if not exists
+    if (!map.getSource(sourceId)) {
+      map.addSource(sourceId, {
+        type: 'raster',
+        tiles: [tileUrl],
+        tileSize: 256,
+        scheme: 'tms',
+        bounds: [35, 45, 55, 62],
+        minzoom: minzoom,
+        maxzoom: maxzoom
+      });
+    }
+    // Add layer if not exists
+    if (!map.getLayer(id)) {
+      // Insert before first road/trail layer for correct z-order
+      const firstTrailLayer = map.getStyle().layers.find(l => 
+        l.id.startsWith('trails-') || l.id.startsWith('poi-')
+      );
+      map.addLayer({
+        id: id,
+        type: 'raster',
+        source: sourceId,
+        paint: {
+          'raster-opacity': opacity
+        },
+        minzoom: minzoom,
+        maxzoom: maxzoom
+      }, firstTrailLayer ? firstTrailLayer.id : undefined);
+    }
+  } else {
+    // Remove layer and source
+    if (map.getLayer(id)) map.removeLayer(id);
+    if (map.getSource(sourceId)) map.removeSource(sourceId);
+  }
+}
+
+function updateHillshadeAvailability() {
+  const map = window._map;
+  if (!map) return;
+  
+  const zoom = map.getZoom();
+  const cb = document.getElementById('terrain-hillshade-cb');
+  const hint = document.getElementById('terrain-hillshade-hint');
+  const label = cb ? cb.closest('.terrain-checkbox') : null;
+  
+  if (zoom < 10) {
+    if (cb) cb.disabled = true;
+    if (label) label.classList.add('disabled');
+    if (hint) hint.style.display = 'inline';
+  } else {
+    if (cb) cb.disabled = false;
+    if (label) label.classList.remove('disabled');
+    if (hint) hint.style.display = 'none';
+  }
+}
+
+function restoreTerrainState() {
+  const hypso = localStorage.getItem('terrain-hypso') === '1';
+  const hillshade = localStorage.getItem('terrain-hillshade') === '1';
+  
+  const hypsoCb = document.getElementById('terrain-hypso-cb');
+  const hillshadeCb = document.getElementById('terrain-hillshade-cb');
+  
+  if (hypsoCb) hypsoCb.checked = hypso;
+  if (hillshadeCb) hillshadeCb.checked = hillshade;
+  
+  if (hypso || hillshade) {
+    onTerrainCheckbox();
+  }
+  
+  // Update button active state
+  const btn = document.getElementById('terrain-toggle');
+  if (btn) btn.classList.toggle('active', hypso || hillshade);
+}
+
+// Hook into map load and zoom changes
+(function initTerrain() {
+  const map = window._map;
+  if (map) {
+    map.on('zoomend', updateHillshadeAvailability);
+    map.on('style.load', () => {
+      // Re-apply terrain after style change (theme switch)
+      setTimeout(restoreTerrainState, 100);
+    });
+    // Initial state
+    updateHillshadeAvailability();
+    restoreTerrainState();
+  } else {
+    // Map not ready yet, wait
+    const interval = setInterval(() => {
+      if (window._map) {
+        clearInterval(interval);
+        window._map.on('zoomend', updateHillshadeAvailability);
+        window._map.on('style.load', () => {
+          setTimeout(restoreTerrainState, 100);
+        });
+        updateHillshadeAvailability();
+        restoreTerrainState();
+      }
+    }, 500);
+  }
+})();
diff --git a/tasks/enduro-trails/reports/results.json b/tasks/enduro-trails/reports/results.json
index 0925479..193928b 100644
--- a/tasks/enduro-trails/reports/results.json
+++ b/tasks/enduro-trails/reports/results.json
@@ -1,145 +1,37 @@
 {
-  "timestamp": "2026-05-12T21:44:53.908Z",
-  "testFile": "TEST_CASES_UI_TERRAIN.md",
+  "timestamp": "2026-05-12T21:55:27.927Z",
+  "testFile": "TEST_CASES_UI_TERRAIN_EXT.md",
   "results": [
     {
-      "id": "TC-T-01",
-      "name": "Кнопка рельеф видна",
+      "id": "TC-T-07",
+      "name": "Гипсометрия на зуме 10",
       "viewport": "desktop",
       "status": "completed",
       "screenshots": [
-        "TC-T-01-desktop-terrain-btn-visible.png",
-        "TC-T-01-desktop-check-1778622228148.png"
+        "TC-T-07-desktop-hypso-zoom10.png",
+        "TC-T-07-desktop-check-1778622909625.png"
       ],
       "checks": [
         {
-          "description": "Кнопка рельеф (иконка горы) видна в правой панели кнопок. Не обрезана, достаточного размера для тапа.",
-          "screenshot": "TC-T-01-desktop-check-1778622228148.png"
+          "description": "Гипсометрия включена на зуме 10. Должен быть виден цветной полупрозрачный слой (зелёные тона для равнины ЦФО) поверх базовой карты.",
+          "screenshot": "TC-T-07-desktop-check-1778622909625.png"
         }
       ],
       "errors": []
     },
     {
-      "id": "TC-T-01",
-      "name": "Кнопка рельеф видна",
-      "viewport": "mobile",
-      "status": "completed",
-      "screenshots": [
-        "TC-T-01-mobile-terrain-btn-visible.png",
-        "TC-T-01-mobile-check-1778622233547.png"
-      ],
-      "checks": [
-        {
-          "description": "Кнопка рельеф (иконка горы) видна в правой панели кнопок. Не обрезана, достаточного размера для тапа.",
-          "screenshot": "TC-T-01-mobile-check-1778622233547.png"
-        }
-      ],
-      "errors": []
-    },
-    {
-      "id": "TC-T-02",
-      "name": "Попап рельеф открывается",
+      "id": "TC-T-08",
+      "name": "Hillshade на зуме 11",
       "viewport": "desktop",
       "status": "completed",
       "screenshots": [
-        "TC-T-02-desktop-terrain-popup-open.png",
-        "TC-T-02-desktop-check-1778622239862.png"
+        "TC-T-08-desktop-hillshade-zoom11.png",
+        "TC-T-08-desktop-check-1778622927607.png"
       ],
       "checks": [
         {
-          "description": "Попап рельеф открылся. Видны два чекбокса: Гипсометрия и Отмывка. Попап не обрезан, текст читаем.",
-          "screenshot": "TC-T-02-desktop-check-1778622239862.png"
-        }
-      ],
-      "errors": []
-    },
-    {
-      "id": "TC-T-02",
-      "name": "Попап рельеф открывается",
-      "viewport": "mobile",
-      "status": "completed",
-      "screenshots": [
-        "TC-T-02-mobile-terrain-popup-open.png",
-        "TC-T-02-mobile-check-1778622245753.png"
-      ],
-      "checks": [
-        {
-          "description": "Попап рельеф открылся. Видны два чекбокса: Гипсометрия и Отмывка. Попап не обрезан, текст читаем.",
-          "screenshot": "TC-T-02-mobile-check-1778622245753.png"
-        }
-      ],
-      "errors": []
-    },
-    {
-      "id": "TC-T-03",
-      "name": "Включение гипсометрии",
-      "viewport": "desktop",
-      "status": "completed_with_errors",
-      "screenshots": [
-        "TC-T-03-desktop-hypso-enabled.png",
-        "TC-T-03-desktop-check-1778622259991.png"
-      ],
-      "checks": [
-        {
-          "description": "Гипсометрия включена: на карте виден цветной полупрозрачный слой рельефа (зелёные/жёлтые/коричневые тона поверх базовой карты).",
-          "screenshot": "TC-T-03-desktop-check-1778622259991.png"
-        }
-      ],
-      "errors": [
-        "Click failed on \"#terrain-hypso-cb\": page.click: Timeout 5000ms exceeded.\nCall log:\n  - waiting for locator('#terrain-hypso-cb')\n    - lo"
-      ]
-    },
-    {
-      "id": "TC-T-04",
-      "name": "Включение отмывки (hillshade)",
-      "viewport": "desktop",
-      "status": "completed_with_errors",
-      "screenshots": [
-        "TC-T-04-desktop-hillshade-enabled.png",
-        "TC-T-04-desktop-check-1778622280567.png"
-      ],
-      "checks": [
-        {
-          "description": "Отмывка включена: видны тени рельефа (затемнение на склонах). Если зум < 10 — чекбокс hillshade должен быть disabled с подсказкой 'Зум 10+'.",
-          "screenshot": "TC-T-04-desktop-check-1778622280567.png"
-        }
-      ],
-      "errors": [
-        "Click failed on \"#terrain-hypso-cb\": page.click: Timeout 5000ms exceeded.\nCall log:\n  - waiting for locator('#terrain-hypso-cb')\n    - lo",
-        "Click failed on \"#terrain-hillshade-cb\": page.click: Timeout 5000ms exceeded.\nCall log:\n  - waiting for locator('#terrain-hillshade-cb')\n    "
-      ]
-    },
-    {
-      "id": "TC-T-05",
-      "name": "Попап закрывается по повторному клику",
-      "viewport": "desktop",
-      "status": "completed",
-      "screenshots": [
-        "TC-T-05-desktop-popup-open.png",
-        "TC-T-05-desktop-popup-closed.png",
-        "TC-T-05-desktop-check-1778622287510.png"
-      ],
-      "checks": [
-        {
-          "description": "Попап закрылся после повторного клика на кнопку рельеф. Попап не виден на экране.",
-          "screenshot": "TC-T-05-desktop-check-1778622287510.png"
-        }
-      ],
-      "errors": []
-    },
-    {
-      "id": "TC-T-06",
-      "name": "Мобильный попап не обрезан",
-      "viewport": "mobile",
-      "status": "completed",
-      "screenshots": [
-        "TC-T-06-mobile-terrain-popup-mobile.png",
-        "TC-T-06-mobile-check-1778622293523.png"
-      ],
-      "checks": [
-        {
-          "description": "Попап terrain полностью виден на мобильном экране. Не обрезан снизу/справа. Чекбоксы достаточного размера для тапа (>44px).",
-          "screenshot": "TC-T-06-mobile-check-1778622293523.png"
+          "description": "Оба слоя включены на зуме 11: гипсометрия (цвет) + отмывка (тени). Должны быть видны тени на склонах рельефа.",
+          "screenshot": "TC-T-08-desktop-check-1778622927607.png"
         }
       ],
       "errors": []
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