diff --git a/custom_components/houseplan/const.py b/custom_components/houseplan/const.py
index ddbe6a3..b510f5b 100755
--- a/custom_components/houseplan/const.py
+++ b/custom_components/houseplan/const.py
@@ -11,7 +11,7 @@ PLANS_DIR = "houseplan/plans"  # relative to the HA configuration directory
 FILES_URL = "/houseplan_files/files"
 FILES_DIR = "houseplan/files"
 CONF_ADMIN_ONLY = "admin_only"
-VERSION = "1.15.3"
+VERSION = "1.15.4"
 
 DEFAULT_CONFIG: dict = {
     "spaces": [],
diff --git a/custom_components/houseplan/frontend/houseplan-card.js b/custom_components/houseplan/frontend/houseplan-card.js
index 4296743..dfcd2ec 100755
--- a/custom_components/houseplan/frontend/houseplan-card.js
+++ b/custom_components/houseplan/frontend/houseplan-card.js
@@ -315,10 +315,10 @@ const t=globalThis,e=t.ShadowRoot&&(void 0===t.ShadyCSS||t.ShadyCSS.nativeShadow
     }
     .dev {
       position: absolute;
-      box-sizing: border-box; /* рамка 1px не должна смещать центр значка от точки привязки */
+      /* центр квадрата (включая рамку 1px) точно на точке привязки: -(size/2 + border) */
       width: var(--icon-size, 2.5cqw);
       height: var(--icon-size, 2.5cqw);
-      margin: calc(var(--icon-size, 2.5cqw) / -2) 0 0 calc(var(--icon-size, 2.5cqw) / -2);
+      margin: calc(var(--icon-size, 2.5cqw) / -2 - 1px) 0 0 calc(var(--icon-size, 2.5cqw) / -2 - 1px);
       border-radius: 22%;
       background: var(--hp-bg);
       border: 1px solid var(--hp-line);
@@ -334,6 +334,10 @@ const t=globalThis,e=t.ShadowRoot&&(void 0===t.ShadyCSS||t.ShadyCSS.nativeShadow
     }
     .dev ha-icon {
       --mdc-icon-size: calc(var(--icon-size, 2.5cqw) * 0.62);
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      line-height: 0;
     }
     .dev:active {
       cursor: grabbing;
@@ -1311,4 +1315,4 @@ const t=globalThis,e=t.ShadowRoot&&(void 0===t.ShadyCSS||t.ShadyCSS.nativeShadow
           </button>
         </div>
       </div>
-    </div>`}}Yt.properties={hass:{attribute:!1},_config:{state:!0},_space:{state:!0},_layout:{state:!0},_devices:{state:!0},_tip:{state:!0},_selId:{state:!0},_toast:{state:!0},_serverCfg:{state:!0},_markup:{state:!0},_tool:{state:!0},_path:{state:!0},_cursorPt:{state:!0},_areaSel:{state:!0},_nameSel:{state:!0},_roomDialog:{state:!0},_spaceDialog:{state:!0},_infoCard:{state:!0},_rulesDialog:{state:!0},_importDialog:{state:!0},_markerDialog:{state:!0},_zoom:{state:!0},_view:{state:!0}},Yt.styles=Lt,customElements.get("houseplan-card")||customElements.define("houseplan-card",Yt),window.customCards=window.customCards||[],window.customCards.find(t=>"houseplan-card"===t.type)||window.customCards.push({type:"houseplan-card",name:"House Plan Card",description:"Interactive house plan: spaces, rooms and devices with live states and drag layout."}),console.info("%c HOUSEPLAN-CARD %c v1.15.3 ","background:#3ea6ff;color:#04121f;font-weight:700","");
+    </div>`}}Yt.properties={hass:{attribute:!1},_config:{state:!0},_space:{state:!0},_layout:{state:!0},_devices:{state:!0},_tip:{state:!0},_selId:{state:!0},_toast:{state:!0},_serverCfg:{state:!0},_markup:{state:!0},_tool:{state:!0},_path:{state:!0},_cursorPt:{state:!0},_areaSel:{state:!0},_nameSel:{state:!0},_roomDialog:{state:!0},_spaceDialog:{state:!0},_infoCard:{state:!0},_rulesDialog:{state:!0},_importDialog:{state:!0},_markerDialog:{state:!0},_zoom:{state:!0},_view:{state:!0}},Yt.styles=Lt,customElements.get("houseplan-card")||customElements.define("houseplan-card",Yt),window.customCards=window.customCards||[],window.customCards.find(t=>"houseplan-card"===t.type)||window.customCards.push({type:"houseplan-card",name:"House Plan Card",description:"Interactive house plan: spaces, rooms and devices with live states and drag layout."}),console.info("%c HOUSEPLAN-CARD %c v1.15.4 ","background:#3ea6ff;color:#04121f;font-weight:700","");
diff --git a/custom_components/houseplan/manifest.json b/custom_components/houseplan/manifest.json
index 4dd26b3..23c6305 100755
--- a/custom_components/houseplan/manifest.json
+++ b/custom_components/houseplan/manifest.json
@@ -16,5 +16,5 @@
   "issue_tracker": "https://github.com/Matysh/houseplan-card/issues",
   "requirements": [],
   "single_config_entry": true,
-  "version": "1.15.3"
+  "version": "1.15.4"
 }
diff --git a/demo/smoke_icon_center.mjs b/demo/smoke_icon_center.mjs
index 38b3628..c9d4c03 100644
--- a/demo/smoke_icon_center.mjs
+++ b/demo/smoke_icon_center.mjs
@@ -11,9 +11,15 @@ const bad = await page.evaluate(() => {
     const ax = lr.left + (parseFloat(d.style.left) / 100) * lr.width;
     const ay = lr.top + (parseFloat(d.style.top) / 100) * lr.height;
     const r = d.getBoundingClientRect();
-    const offX = r.left + r.width / 2 - ax, offY = r.top + r.height / 2 - ay;
-    if (Math.abs(offX) > 0.6 || Math.abs(offY) > 0.6)
-      bad.push({ icon: d.querySelector('ha-icon')?.getAttribute('icon'), offX: +offX.toFixed(2), offY: +offY.toFixed(2) });
+    const cx = r.left + r.width / 2, cy = r.top + r.height / 2;
+    const offX = cx - ax, offY = cy - ay;
+    // glyph centred within the badge
+    const icon = d.querySelector('ha-icon');
+    const svg = icon?.shadowRoot?.querySelector('svg') || icon?.shadowRoot?.querySelector('ha-svg-icon')?.shadowRoot?.querySelector('svg');
+    let gX = 0, gY = 0;
+    if (svg) { const sr = svg.getBoundingClientRect(); gX = sr.left + sr.width / 2 - cx; gY = sr.top + sr.height / 2 - cy; }
+    if (Math.abs(offX) > 0.6 || Math.abs(offY) > 0.6 || Math.abs(gX) > 0.6 || Math.abs(gY) > 0.6)
+      bad.push({ icon: icon?.getAttribute('icon'), offX: +offX.toFixed(2), offY: +offY.toFixed(2), glyphX: +gX.toFixed(2), glyphY: +gY.toFixed(2) });
   }
   return bad;
 });
diff --git a/demo/srv/assets/houseplan-card.js b/demo/srv/assets/houseplan-card.js
index c8b313c..08d8892 100755
--- a/demo/srv/assets/houseplan-card.js
+++ b/demo/srv/assets/houseplan-card.js
@@ -315,10 +315,10 @@ const t=globalThis,e=t.ShadowRoot&&(void 0===t.ShadyCSS||t.ShadyCSS.nativeShadow
     }
     .dev {
       position: absolute;
-      box-sizing: border-box; /* рамка 1px не должна смещать центр значка от точки привязки */
+      /* центр квадрата (включая рамку 1px) точно на точке привязки: -(size/2 + border) */
       width: var(--icon-size, 2.5cqw);
       height: var(--icon-size, 2.5cqw);
-      margin: calc(var(--icon-size, 2.5cqw) / -2) 0 0 calc(var(--icon-size, 2.5cqw) / -2);
+      margin: calc(var(--icon-size, 2.5cqw) / -2 - 1px) 0 0 calc(var(--icon-size, 2.5cqw) / -2 - 1px);
       border-radius: 22%;
       background: var(--hp-bg);
       border: 1px solid var(--hp-line);
@@ -334,6 +334,10 @@ const t=globalThis,e=t.ShadowRoot&&(void 0===t.ShadyCSS||t.ShadyCSS.nativeShadow
     }
     .dev ha-icon {
       --mdc-icon-size: calc(var(--icon-size, 2.5cqw) * 0.62);
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      line-height: 0;
     }
     .dev:active {
       cursor: grabbing;
@@ -1311,4 +1315,4 @@ const t=globalThis,e=t.ShadowRoot&&(void 0===t.ShadyCSS||t.ShadyCSS.nativeShadow
           </button>
         </div>
       </div>
-    </div>`}}Yt.properties={hass:{attribute:!1},_config:{state:!0},_space:{state:!0},_layout:{state:!0},_devices:{state:!0},_tip:{state:!0},_selId:{state:!0},_toast:{state:!0},_serverCfg:{state:!0},_markup:{state:!0},_tool:{state:!0},_path:{state:!0},_cursorPt:{state:!0},_areaSel:{state:!0},_nameSel:{state:!0},_roomDialog:{state:!0},_spaceDialog:{state:!0},_infoCard:{state:!0},_rulesDialog:{state:!0},_importDialog:{state:!0},_markerDialog:{state:!0},_zoom:{state:!0},_view:{state:!0}},Yt.styles=Lt,customElements.get("houseplan-card")||customElements.define("houseplan-card",Yt),window.customCards=window.customCards||[],window.customCards.find(t=>"houseplan-card"===t.type)||window.customCards.push({type:"houseplan-card",name:"House Plan Card",description:"Interactive house plan: spaces, rooms and devices with live states and drag layout."}),console.info("%c HOUSEPLAN-CARD %c v1.15.2 ","background:#3ea6ff;color:#04121f;font-weight:700","");
+    </div>`}}Yt.properties={hass:{attribute:!1},_config:{state:!0},_space:{state:!0},_layout:{state:!0},_devices:{state:!0},_tip:{state:!0},_selId:{state:!0},_toast:{state:!0},_serverCfg:{state:!0},_markup:{state:!0},_tool:{state:!0},_path:{state:!0},_cursorPt:{state:!0},_areaSel:{state:!0},_nameSel:{state:!0},_roomDialog:{state:!0},_spaceDialog:{state:!0},_infoCard:{state:!0},_rulesDialog:{state:!0},_importDialog:{state:!0},_markerDialog:{state:!0},_zoom:{state:!0},_view:{state:!0}},Yt.styles=Lt,customElements.get("houseplan-card")||customElements.define("houseplan-card",Yt),window.customCards=window.customCards||[],window.customCards.find(t=>"houseplan-card"===t.type)||window.customCards.push({type:"houseplan-card",name:"House Plan Card",description:"Interactive house plan: spaces, rooms and devices with live states and drag layout."}),console.info("%c HOUSEPLAN-CARD %c v1.15.3 ","background:#3ea6ff;color:#04121f;font-weight:700","");
diff --git a/demo/srv/demo.html b/demo/srv/demo.html
index 81da0d8..c62eb0d 100644
--- a/demo/srv/demo.html
+++ b/demo/srv/demo.html
@@ -27,9 +27,13 @@ class HaIcon extends HTMLElement{
   _r(){
     const p=(window.__ICONS||{})[this.getAttribute('icon')]||'';
     if(!this.shadowRoot) this.attachShadow({mode:'open'});
-    this.shadowRoot.innerHTML='<style>:host{display:inline-flex;align-items:center;justify-content:center;'+
-      'width:var(--mdc-icon-size,24px);height:var(--mdc-icon-size,24px);vertical-align:middle}'+
-      'svg{width:100%;height:100%;fill:currentColor;display:block}</style>'+
+    // Faithful to HA's ha-icon: host is display:block with a large inherited line-height,
+    // which pushes the (smaller) svg off-centre unless the consumer neutralises it.
+    this.shadowRoot.innerHTML='<style>:host{display:block;line-height:1.8;'+
+      'width:var(--mdc-icon-size,24px);height:var(--mdc-icon-size,24px);'+
+      'fill:currentColor;vertical-align:middle}'+
+      'svg{width:var(--mdc-icon-size,24px);height:var(--mdc-icon-size,24px);fill:currentColor;'+
+      'display:inline-block;vertical-align:baseline}</style>'+
       '<svg viewBox="0 0 24 24"><path d="'+p+'"></path></svg>';
   }
 }
diff --git a/dist/houseplan-card.js b/dist/houseplan-card.js
index 4296743..dfcd2ec 100755
--- a/dist/houseplan-card.js
+++ b/dist/houseplan-card.js
@@ -315,10 +315,10 @@ const t=globalThis,e=t.ShadowRoot&&(void 0===t.ShadyCSS||t.ShadyCSS.nativeShadow
     }
     .dev {
       position: absolute;
-      box-sizing: border-box; /* рамка 1px не должна смещать центр значка от точки привязки */
+      /* центр квадрата (включая рамку 1px) точно на точке привязки: -(size/2 + border) */
       width: var(--icon-size, 2.5cqw);
       height: var(--icon-size, 2.5cqw);
-      margin: calc(var(--icon-size, 2.5cqw) / -2) 0 0 calc(var(--icon-size, 2.5cqw) / -2);
+      margin: calc(var(--icon-size, 2.5cqw) / -2 - 1px) 0 0 calc(var(--icon-size, 2.5cqw) / -2 - 1px);
       border-radius: 22%;
       background: var(--hp-bg);
       border: 1px solid var(--hp-line);
@@ -334,6 +334,10 @@ const t=globalThis,e=t.ShadowRoot&&(void 0===t.ShadyCSS||t.ShadyCSS.nativeShadow
     }
     .dev ha-icon {
       --mdc-icon-size: calc(var(--icon-size, 2.5cqw) * 0.62);
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      line-height: 0;
     }
     .dev:active {
       cursor: grabbing;
@@ -1311,4 +1315,4 @@ const t=globalThis,e=t.ShadowRoot&&(void 0===t.ShadyCSS||t.ShadyCSS.nativeShadow
           </button>
         </div>
       </div>
-    </div>`}}Yt.properties={hass:{attribute:!1},_config:{state:!0},_space:{state:!0},_layout:{state:!0},_devices:{state:!0},_tip:{state:!0},_selId:{state:!0},_toast:{state:!0},_serverCfg:{state:!0},_markup:{state:!0},_tool:{state:!0},_path:{state:!0},_cursorPt:{state:!0},_areaSel:{state:!0},_nameSel:{state:!0},_roomDialog:{state:!0},_spaceDialog:{state:!0},_infoCard:{state:!0},_rulesDialog:{state:!0},_importDialog:{state:!0},_markerDialog:{state:!0},_zoom:{state:!0},_view:{state:!0}},Yt.styles=Lt,customElements.get("houseplan-card")||customElements.define("houseplan-card",Yt),window.customCards=window.customCards||[],window.customCards.find(t=>"houseplan-card"===t.type)||window.customCards.push({type:"houseplan-card",name:"House Plan Card",description:"Interactive house plan: spaces, rooms and devices with live states and drag layout."}),console.info("%c HOUSEPLAN-CARD %c v1.15.3 ","background:#3ea6ff;color:#04121f;font-weight:700","");
+    </div>`}}Yt.properties={hass:{attribute:!1},_config:{state:!0},_space:{state:!0},_layout:{state:!0},_devices:{state:!0},_tip:{state:!0},_selId:{state:!0},_toast:{state:!0},_serverCfg:{state:!0},_markup:{state:!0},_tool:{state:!0},_path:{state:!0},_cursorPt:{state:!0},_areaSel:{state:!0},_nameSel:{state:!0},_roomDialog:{state:!0},_spaceDialog:{state:!0},_infoCard:{state:!0},_rulesDialog:{state:!0},_importDialog:{state:!0},_markerDialog:{state:!0},_zoom:{state:!0},_view:{state:!0}},Yt.styles=Lt,customElements.get("houseplan-card")||customElements.define("houseplan-card",Yt),window.customCards=window.customCards||[],window.customCards.find(t=>"houseplan-card"===t.type)||window.customCards.push({type:"houseplan-card",name:"House Plan Card",description:"Interactive house plan: spaces, rooms and devices with live states and drag layout."}),console.info("%c HOUSEPLAN-CARD %c v1.15.4 ","background:#3ea6ff;color:#04121f;font-weight:700","");
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 16ae9ee..d53f876 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## v1.15.4 — 2026-07-08 (fix: device icon vertical centering — proper root cause)
+- **Root cause of the off-centre icon, found in the live app** (the demo stub hid it):
+  HA's real `<ha-icon>` host is `display:block` with a large inherited `line-height`
+  (~22 px for a ~12 px glyph), so the SVG sat ~1.8 px **below** the badge centre.
+  Fix: `.dev ha-icon` is now a zero-line-height flex box — the glyph centres exactly.
+- Reverted the v1.15.3 `box-sizing: border-box` (it shrank the badge by 2 px and made the
+  vertical offset *more* visible — "worse"). The 1 px anchor drift is instead corrected by
+  the centering margin (`-(size/2 + 1px)`), keeping the original badge size.
+- Verified in the real dashboard: anchor offset 0, glyph offset 0, badge size unchanged.
+- Demo `ha-icon` stub made faithful to HA (block + line-height) so `smoke_icon_center`
+  now actually reproduces and guards this; the smoke also asserts glyph-in-badge centering.
+
 ## v1.15.3 — 2026-07-08 (fix: device icon 1px off its anchor point)
 - Device icon badges were sitting **1 px down-and-right of their true point**: `.dev`
   used the default `content-box`, so the 1 px border made the rendered square 2 px
diff --git a/docs/STATUS.md b/docs/STATUS.md
index 0955d33..39b7269 100644
--- a/docs/STATUS.md
+++ b/docs/STATUS.md
@@ -13,7 +13,7 @@
 
 | Item | State |
 |---|---|
-| Version | **v1.15.3** everywhere (manifest, const.py, package.json, CARD_VERSION) |
+| Version | **v1.15.4** everywhere (manifest, const.py, package.json, CARD_VERSION) |
 | GitHub | https://github.com/Matysh/houseplan-card — branch `main`, releases v1.9.3…v1.11.2 |
 | CI | `.github/workflows/validate.yml` (hacs + hassfest + frontend + backend) — **fully green** since v1.11.1; `release.yml` auto-attaches the card bundle (needs `permissions: contents: write`, fixed) |
 | HACS | Works as custom repository (id 1290210112 on the home instance). **Inclusion PR: https://github.com/hacs/default/pull/9004** (queue ≈2 months as of 2026-07). Lesson: #8995 was auto-closed by hacs-bot — the PR body MUST be their exact template with every checkbox ticked and all 3 links (release, HACS action run, hassfest run); a custom body gets closed without discussion |
@@ -55,6 +55,9 @@
   (fridges/TRVs/chip `*_device_temperature`/diagnostic); now thermometer/air-monitor only.
 - **v1.15.3** — fix: device icon badge sat 1 px off its anchor (content-box + 1 px
   border); `box-sizing: border-box` centres it exactly on the device point.
+- **v1.15.4** — fix: real `ha-icon` (block + big line-height) put the glyph ~1.8 px low;
+  `.dev ha-icon` is now a zero-line-height flex box. Reverted v1.15.3 border-box (shrank the
+  badge). Verified live. Demo stub made faithful so the smoke guards it.
 
 ## Where things live
 
diff --git a/docs/TESTING.md b/docs/TESTING.md
index f6e99c3..d229cd4 100644
--- a/docs/TESTING.md
+++ b/docs/TESTING.md
@@ -57,6 +57,7 @@ Run the *core flows* (marked ★ below) in each environment at least once per mi
       smart-plug chip temperatures (`*_device_temperature`) and diagnostic-category temps are excluded [auto]
 - [ ] Space dialog is 500 px wide; the comfort-bounds inputs are compact (56 px)
 - [ ] Device icon badge is centred exactly on its point (no 1 px down-right drift) [auto]
+- [ ] Device glyph is centred within its badge (no vertical drift — real ha-icon is block+line-height) [auto]
 - [ ] Room hover highlight still works when custom borders/fills are on
 - [ ] Settings persist across reload and other browsers (server-side)
 
diff --git a/package.json b/package.json
index 772cbbd..4542f93 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "houseplan-card",
-  "version": "1.15.3",
+  "version": "1.15.4",
   "description": "Interactive house plan Lovelace card for Home Assistant",
   "license": "MIT",
   "type": "module",
diff --git a/src/houseplan-card.ts b/src/houseplan-card.ts
index 3d14bf7..03f0eb6 100755
--- a/src/houseplan-card.ts
+++ b/src/houseplan-card.ts
@@ -25,7 +25,7 @@ import './editor';
 import { cardStyles } from './styles';
 import { langOf, t, type I18nKey } from './i18n';
 
-const CARD_VERSION = '1.15.3';
+const CARD_VERSION = '1.15.4';
 const LS_KEY = 'houseplan_card_layout_v1';
 const LS_CFG = 'houseplan_card_cfg_v1'; // cache of the server config+layout for instant rendering
 const LS_ZOOM = 'houseplan_card_zoom_v1';
diff --git a/src/styles.ts b/src/styles.ts
index 6acc6bd..cb488e0 100644
--- a/src/styles.ts
+++ b/src/styles.ts
@@ -312,10 +312,10 @@ export const cardStyles = css`
     }
     .dev {
       position: absolute;
-      box-sizing: border-box; /* рамка 1px не должна смещать центр значка от точки привязки */
+      /* центр квадрата (включая рамку 1px) точно на точке привязки: -(size/2 + border) */
       width: var(--icon-size, 2.5cqw);
       height: var(--icon-size, 2.5cqw);
-      margin: calc(var(--icon-size, 2.5cqw) / -2) 0 0 calc(var(--icon-size, 2.5cqw) / -2);
+      margin: calc(var(--icon-size, 2.5cqw) / -2 - 1px) 0 0 calc(var(--icon-size, 2.5cqw) / -2 - 1px);
       border-radius: 22%;
       background: var(--hp-bg);
       border: 1px solid var(--hp-line);
@@ -331,6 +331,10 @@ export const cardStyles = css`
     }
     .dev ha-icon {
       --mdc-icon-size: calc(var(--icon-size, 2.5cqw) * 0.62);
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      line-height: 0;
     }
     .dev:active {
       cursor: grabbing;