diff --git a/app/Model/Facade/FakturaFacade.php b/app/Model/Facade/FakturaFacade.php
index 3dbcc7e..39d4826 100644
--- a/app/Model/Facade/FakturaFacade.php
+++ b/app/Model/Facade/FakturaFacade.php
@@ -336,38 +336,76 @@ class FakturaFacade
             'O_DIC' => self::nullIfEmpty($data['O_DIC'] ?? null),
         ];
 
-        if (!$isNew) {
-            return $fromForm;
-        }
-
-        $defaults = $this->getDodavatelDefaults($firmaId);
-        foreach ($defaults as $key => $value) {
-            if ($fromForm[$key] === null || $fromForm[$key] === '') {
-                $fromForm[$key] = $value;
-            }
-        }
-
-        $zakaznikId = !empty($data['ZAKAZNIK_ID']) ? (int) $data['ZAKAZNIK_ID'] : null;
-        $zakaznik = $zakaznikId
-            ? $this->kufrikExplorer->table('ZAKAZNIK')->where('ID', $zakaznikId)->fetch()
-            : null;
-        if ($zakaznik) {
-            $oDefaults = [
-                'O_PRAJM' => trim(($zakaznik->PRIJMENI ?? '') . ' ' . ($zakaznik->JMENO ?? '')) ?: null,
-                'O_ULICE' => $zakaznik->ULICE ?? null,
-                'O_MESTO' => $zakaznik->MESTO ?? null,
-                'O_PSC' => $zakaznik->PSC ?? null,
-                'O_IC' => $zakaznik->IC ?? null,
-                'O_DIC' => $zakaznik->DIC ?? null,
-            ];
-            foreach ($oDefaults as $key => $value) {
+        if ($isNew) {
+            $defaults = $this->getDodavatelDefaults($firmaId);
+            foreach ($defaults as $key => $value) {
                 if ($fromForm[$key] === null || $fromForm[$key] === '') {
                     $fromForm[$key] = $value;
                 }
             }
+
+            $zakaznikId = !empty($data['ZAKAZNIK_ID']) ? (int) $data['ZAKAZNIK_ID'] : null;
+            $zakaznik = $zakaznikId
+                ? $this->kufrikExplorer->table('ZAKAZNIK')->where('ID', $zakaznikId)->fetch()
+                : null;
+            if ($zakaznik) {
+                $oDefaults = [
+                    'O_PRAJM' => trim(($zakaznik->PRIJMENI ?? '') . ' ' . ($zakaznik->JMENO ?? '')) ?: null,
+                    'O_ULICE' => $zakaznik->ULICE ?? null,
+                    'O_MESTO' => $zakaznik->MESTO ?? null,
+                    'O_PSC' => $zakaznik->PSC ?? null,
+                    'O_IC' => $zakaznik->IC ?? null,
+                    'O_DIC' => $zakaznik->DIC ?? null,
+                ];
+                foreach ($oDefaults as $key => $value) {
+                    if ($fromForm[$key] === null || $fromForm[$key] === '') {
+                        $fromForm[$key] = $value;
+                    }
+                }
+            }
         }
 
-        return $fromForm;
+        return self::clampSnapshot($fromForm);
+    }
+
+    /**
+     * Ořízne snapshot na délky sloupců FAKTURA (ochrana před truncací SQL Serveru).
+     *
+     * @param array<string, string|null> $snapshot
+     * @return array<string, string|null>
+     */
+    private static function clampSnapshot(array $snapshot): array
+    {
+        $limits = [
+            'D_PRAJM' => 511,
+            'D_ULICE' => 50,
+            'D_MESTO' => 50,
+            'D_PSC' => 50,
+            'D_IC' => 8,
+            'D_DIC' => 12,
+            'D_BANKA' => 100,
+            'D_TELEFON' => 20,
+            'D_EMAIL' => 100,
+            'D_WEB' => 100,
+            'O_PRAJM' => 511,
+            'O_ULICE' => 50,
+            'O_MESTO' => 50,
+            'O_PSC' => 5,
+            'O_IC' => 8,
+            'O_DIC' => 10,
+        ];
+
+        foreach ($limits as $key => $max) {
+            if (!isset($snapshot[$key]) || $snapshot[$key] === null) {
+                continue;
+            }
+            $text = (string) $snapshot[$key];
+            if (mb_strlen($text) > $max) {
+                $snapshot[$key] = mb_substr($text, 0, $max);
+            }
+        }
+
+        return $snapshot;
     }
 
     private static function nullIfEmpty(mixed $value): ?string
@@ -601,70 +639,6 @@ class FakturaFacade
         $this->kufrikExplorer->table('FAKTURA')->where('ID', $id)->delete();
     }
 
-    /**
-     * Kopie faktury: nové číslo, dnešní data, stejný odběratel a položky, bez plateb.
-     *
-     * @return int ID nové faktury
-     */
-    public function duplicate(int $id, int $firmaId): int
-    {
-        $zdroj = $this->getById($id);
-        if (!$zdroj) {
-            throw new \InvalidArgumentException('Faktura nebyla nalezena.');
-        }
-
-        $dnes = new \DateTimeImmutable('today');
-        $dalsi = $this->getNextCislo($firmaId, $dnes);
-        $datumVystaveni = $dnes->format('Y-m-d');
-        $datumSplatnosti = $dnes
-            ->modify('+' . $dalsi['splatnostDny'] . ' days')
-            ->format('Y-m-d');
-
-        $novaId = $this->saveFaktura([
-            'ZAKAZNIK_ID' => (int) $zdroj->ZAKAZNIK,
-            'CISLO' => $dalsi['cislo'],
-            'CISLO_ABS' => $dalsi['cisloAbs'],
-            'FORMA_UHRADY' => (int) ($zdroj->FORMA_UHRADY ?? 1),
-            'DATUM_VYSTAVENI' => $datumVystaveni,
-            'DATUM_SPLATNOSTI' => $datumSplatnosti,
-            'DATUM_DUZP' => $datumVystaveni,
-            'STAV' => self::STAV_VYSTAVENO,
-            'CINNOSTI' => $zdroj->CINNOSTI,
-            // Zachovat upravené údaje dodavatele / odběratele ze zdroje
-            'D_PRAJM' => $zdroj->D_PRAJM,
-            'D_ULICE' => $zdroj->D_ULICE,
-            'D_MESTO' => $zdroj->D_MESTO,
-            'D_PSC' => $zdroj->D_PSC,
-            'D_IC' => $zdroj->D_IC,
-            'D_DIC' => $zdroj->D_DIC,
-            'D_BANKA' => $zdroj->D_BANKA,
-            'D_TELEFON' => $zdroj->D_TELEFON,
-            'D_EMAIL' => $zdroj->D_EMAIL,
-            'D_WEB' => $zdroj->D_WEB,
-            'O_PRAJM' => $zdroj->O_PRAJM,
-            'O_ULICE' => $zdroj->O_ULICE,
-            'O_MESTO' => $zdroj->O_MESTO,
-            'O_PSC' => $zdroj->O_PSC,
-            'O_IC' => $zdroj->O_IC,
-            'O_DIC' => $zdroj->O_DIC,
-        ], null, $firmaId);
-
-        $polozky = [];
-        foreach ($this->getPolozky($id) as $polozka) {
-            $polozky[] = [
-                'NAZEV' => $polozka->NAZEV,
-                'POCET' => $polozka->POCET,
-                'JEDNOTKA' => $polozka->JEDNOTKA,
-                'CENA_JEDNOTKA' => $polozka->CENA_JEDNOTKA,
-                'SLEVA' => $polozka->SLEVA,
-            ];
-        }
-        $this->savePolozky($novaId, $polozky, $firmaId);
-        $this->syncStav($novaId);
-
-        return $novaId;
-    }
-
     /**
      * Číslo účtu dodavatele ve formátu „účet/kód banky“.
      */
diff --git a/app/UI/@layout.latte b/app/UI/@layout.latte
index 80780c2..927abdc 100644
--- a/app/UI/@layout.latte
+++ b/app/UI/@layout.latte
@@ -25,7 +25,7 @@
 	</script> 
 
 	{* naše vlastní styly *}
-	<link href="{$basePath}/css/layout.css?v={$appVersion ?? '1.0'}-9" rel="stylesheet">
+	<link href="{$basePath}/css/layout.css?v={$appVersion ?? '1.0'}-10" rel="stylesheet">
 </head>
 <body>
 
@@ -218,27 +218,30 @@
 		</div>
 	{/if}
 
-	<!-- Toasty -->
-	<div n:foreach="$flashes as $flash" class="alert alert-{$flash->type} alert-dismissible fade show auto-dismiss mb-1 shadow-sm" role="alert">
-		<i class="bi bi-check-circle-fill me-2"></i>
-		<strong>{$flash->message}</strong>
-		<button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
+	<!-- Flash zprávy jako plovoucí vrstva (neposouvá obsah pod sebou) -->
+	<div class="flash-toast-container" aria-live="polite" aria-atomic="true">
+		<div n:foreach="$flashes as $flash" class="alert alert-{$flash->type} alert-dismissible fade show auto-dismiss flash-toast shadow" role="alert">
+			{if $flash->type === 'danger' || $flash->type === 'error'}
+				<i class="bi bi-exclamation-triangle-fill me-2"></i>
+			{elseif $flash->type === 'warning'}
+				<i class="bi bi-exclamation-circle-fill me-2"></i>
+			{elseif $flash->type === 'info'}
+				<i class="bi bi-info-circle-fill me-2"></i>
+			{else}
+				<i class="bi bi-check-circle-fill me-2"></i>
+			{/if}
+			<strong>{$flash->message}</strong>
+			<button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Zavřít"></button>
+		</div>
 	</div>
 
 	<script>
 		document.addEventListener('DOMContentLoaded', () => {
-			// Najde všechny alerty s třídou auto-dismiss
-			const alerts = document.querySelectorAll('.alert.auto-dismiss');
-			
-			alerts.forEach(alert => {
+			document.querySelectorAll('.flash-toast-container .alert.auto-dismiss').forEach(alert => {
 				setTimeout(() => {
-					// Přidá plynulé vytracení přes Bootstrap třídu nebo JS transition
 					alert.classList.remove('show');
-					alert.classList.add('fade');
-					
-					// Po dokončení animace prvek úplně odstraní z DOMu
 					setTimeout(() => alert.remove(), 500);
-				}, 3000); // 3000 ms = 3 vteřiny
+				}, 3000);
 			});
 		});
 	</script>
diff --git a/app/UI/Faktura/FakturaPresenter.php b/app/UI/Faktura/FakturaPresenter.php
index 5f2b32c..cde127a 100644
--- a/app/UI/Faktura/FakturaPresenter.php
+++ b/app/UI/Faktura/FakturaPresenter.php
@@ -219,21 +219,4 @@ class FakturaPresenter extends BasePresenter
         $this->redirect('this');
     }
 
-    /**
-     * Kopie faktury — nové číslo, dnešní data, stejné položky; otevře editaci.
-     */
-    public function handleDuplicate(int $id): void
-    {
-        $firmaId = (int) $this->getUser()->getIdentity()->firma_id;
-
-        try {
-            $novaId = $this->fakturaFacade->duplicate($id, $firmaId);
-        } catch (\InvalidArgumentException $e) {
-            $this->flashMessage($e->getMessage(), 'danger');
-            $this->redirect('this');
-        }
-
-        $this->flashMessage('Kopie faktury byla vytvořena.', 'success');
-        $this->redirect('FakturaEdit:edit', $novaId);
-    }
 }
\ No newline at end of file
diff --git a/app/UI/Faktura/default.latte b/app/UI/Faktura/default.latte
index 7cb7ed9..98eda65 100644
--- a/app/UI/Faktura/default.latte
+++ b/app/UI/Faktura/default.latte
@@ -137,8 +137,8 @@
                                     <i class="bi bi-pencil"></i>
                                 </a>
 
-                                <!-- Kopie faktury -->
-                                <a n:href="duplicate! $f->ID"
+                                <!-- Kopie faktury (jako nová — editovatelná včetně data vystavení) -->
+                                <a n:href="FakturaEdit:copy $f->ID"
                                    class="btn btn-sm btn-outline-secondary me-1"
                                    title="Vytvořit kopii">
                                     <i class="bi bi-copy"></i>
diff --git a/app/UI/FakturaEdit/FakturaEditPresenter.php b/app/UI/FakturaEdit/FakturaEditPresenter.php
index 59dc46e..655a22c 100644
--- a/app/UI/FakturaEdit/FakturaEditPresenter.php
+++ b/app/UI/FakturaEdit/FakturaEditPresenter.php
@@ -12,6 +12,11 @@ class FakturaEditPresenter extends BasePresenter
     /** @persistent */
     public ?int $id = null;
 
+    /** @var list<object> Položky předvyplněné při kopii (ještě neuložená faktura). */
+    private array $kopiePolozky = [];
+
+    private ?int $ensureZakaznikId = null;
+
     public function __construct(
         private FakturaFacade $fakturaFacade,
         private ZakaznikFacade $zakaznikFacade
@@ -37,6 +42,51 @@ class FakturaEditPresenter extends BasePresenter
         ] + $this->fakturaFacade->getDodavatelDefaults($firmaId));
     }
 
+    /**
+     * Kopie existující faktury jako nová (všechna pole editovatelná, uloží se až po uložení).
+     */
+    public function actionCopy(int $id): void
+    {
+        $this->id = null;
+        $this->setView('edit');
+
+        $zdroj = $this->fakturaFacade->getById($id);
+        if (!$zdroj) {
+            $this->flashMessage('Faktura nebyla nalezena.', 'danger');
+            $this->redirect('Faktura:default');
+        }
+
+        $firmaId = (int) $this->getUser()->getIdentity()->firma_id;
+        $dnes = new \DateTimeImmutable('today');
+        $dalsi = $this->fakturaFacade->getNextCislo($firmaId, $dnes);
+        $datumVystaveni = $dnes->format('Y-m-d');
+
+        if ($zdroj->ZAKAZNIK !== null) {
+            $this->ensureZakaznikId = (int) $zdroj->ZAKAZNIK;
+        }
+
+        $this['fakturaForm']->setDefaults([
+            'ZAKAZNIK_ID' => $this->ensureZakaznikId,
+            'CISLO' => $dalsi['cislo'],
+            'CISLO_ABS' => $dalsi['cisloAbs'],
+            'FORMA_UHRADY' => (int) ($zdroj->FORMA_UHRADY ?? 1),
+            'DATUM_VYSTAVENI' => $datumVystaveni,
+            'DATUM_SPLATNOSTI' => $dnes
+                ->modify('+' . $dalsi['splatnostDny'] . ' days')
+                ->format('Y-m-d'),
+            'DATUM_DUZP' => $datumVystaveni,
+            'CINNOSTI' => $zdroj->CINNOSTI,
+            'O_PRAJM' => $zdroj->O_PRAJM,
+            'O_ULICE' => $zdroj->O_ULICE,
+            'O_MESTO' => $zdroj->O_MESTO,
+            'O_PSC' => $zdroj->O_PSC,
+            'O_IC' => $zdroj->O_IC,
+            'O_DIC' => $zdroj->O_DIC,
+        ] + $this->fakturaFacade->getDodavatelDefaults($firmaId));
+
+        $this->kopiePolozky = $this->fakturaFacade->getPolozky($id);
+    }
+
     public function actionEdit(int $id): void
     {
         $this->id = $id;
@@ -52,6 +102,7 @@ class FakturaEditPresenter extends BasePresenter
         // Explicitně přiřadíme ID zákazníka
         if ($faktura->ZAKAZNIK !== null) {
             $defaults['ZAKAZNIK_ID'] = (int) $faktura->ZAKAZNIK;
+            $this->ensureZakaznikId = (int) $faktura->ZAKAZNIK;
         }
         $defaults['FORMA_UHRADY'] = (int) ($faktura->FORMA_UHRADY ?? 1);
 
@@ -92,6 +143,11 @@ class FakturaEditPresenter extends BasePresenter
         $this->prepareEditTemplate();
     }
 
+    public function renderCopy(): void
+    {
+        $this->prepareEditTemplate();
+    }
+
     public function renderEdit(?int $id = null): void
     {
         $this->prepareEditTemplate();
@@ -101,7 +157,9 @@ class FakturaEditPresenter extends BasePresenter
     {
         $this->template->isEdit = (bool) $this->id;
 
-        $polozky = $this->id ? $this->fakturaFacade->getPolozky($this->id) : [];
+        $polozky = $this->id
+            ? $this->fakturaFacade->getPolozky($this->id)
+            : $this->kopiePolozky;
         $platby = $this->id ? $this->fakturaFacade->getPlatby($this->id) : [];
 
         $celkem = 0.0;
@@ -157,9 +215,8 @@ class FakturaEditPresenter extends BasePresenter
         $form = new Form;
 
         $zakaznici = $this->zakaznikFacade->getFiltered('', 'aktivni');
-        if ($this->id) {
-            $faktura = $this->fakturaFacade->getById($this->id);
-            $zakaznikId = $faktura ? (int) $faktura->ZAKAZNIK : 0;
+        $zakaznikId = $this->ensureZakaznikId ?? 0;
+        if ($zakaznikId) {
             $uzJeVSeznamu = false;
             foreach ($zakaznici as $z) {
                 if ((int) $z->ID === $zakaznikId) {
@@ -167,7 +224,7 @@ class FakturaEditPresenter extends BasePresenter
                     break;
                 }
             }
-            if ($zakaznikId && !$uzJeVSeznamu) {
+            if (!$uzJeVSeznamu) {
                 $stavajici = $this->zakaznikFacade->getById($zakaznikId);
                 if ($stavajici) {
                     $zakaznici[] = $stavajici;
@@ -218,8 +275,8 @@ class FakturaEditPresenter extends BasePresenter
         $form->addText('D_PSC', 'PSČ:')->setMaxLength(50);
         $form->addText('D_MESTO', 'Město:')->setMaxLength(50);
         $form->addText('D_IC', 'IČ:')->setMaxLength(8);
-        $form->addText('D_DIC', 'DIČ:')->setMaxLength(10);
-        $form->addText('D_TELEFON', 'Telefon:')->setMaxLength(15);
+        $form->addText('D_DIC', 'DIČ:')->setMaxLength(12);
+        $form->addText('D_TELEFON', 'Telefon:')->setMaxLength(20);
         $form->addText('D_EMAIL', 'E-mail:')->setMaxLength(100);
         $form->addText('D_BANKA', 'Bankovní účet:')->setMaxLength(100);
         $form->addText('D_WEB', 'Web:')->setMaxLength(100);
@@ -259,21 +316,18 @@ class FakturaEditPresenter extends BasePresenter
             ];
         }
 
-        if ($this->id) {
-            $faktura = $this->fakturaFacade->getById($this->id);
-            $zakaznikId = $faktura ? (int) $faktura->ZAKAZNIK : 0;
-            if ($zakaznikId && !isset($map[(string) $zakaznikId])) {
-                $stavajici = $this->zakaznikFacade->getById($zakaznikId);
-                if ($stavajici) {
-                    $map[(string) $zakaznikId] = [
-                        'nazev' => trim(($stavajici->PRIJMENI ?? '') . ' ' . ($stavajici->JMENO ?? '')),
-                        'ulice' => $stavajici->ULICE,
-                        'psc' => $stavajici->PSC,
-                        'mesto' => $stavajici->MESTO,
-                        'ic' => $stavajici->IC,
-                        'dic' => $stavajici->DIC,
-                    ];
-                }
+        $zakaznikId = $this->ensureZakaznikId ?? 0;
+        if ($zakaznikId && !isset($map[(string) $zakaznikId])) {
+            $stavajici = $this->zakaznikFacade->getById($zakaznikId);
+            if ($stavajici) {
+                $map[(string) $zakaznikId] = [
+                    'nazev' => trim(($stavajici->PRIJMENI ?? '') . ' ' . ($stavajici->JMENO ?? '')),
+                    'ulice' => $stavajici->ULICE,
+                    'psc' => $stavajici->PSC,
+                    'mesto' => $stavajici->MESTO,
+                    'ic' => $stavajici->IC,
+                    'dic' => $stavajici->DIC,
+                ];
             }
         }
 
diff --git a/app/UI/Zakaznik/default.latte b/app/UI/Zakaznik/default.latte
index fab58b5..a5afb2d 100644
--- a/app/UI/Zakaznik/default.latte
+++ b/app/UI/Zakaznik/default.latte
@@ -2,13 +2,6 @@
 
 <div class="container-fluid">
 
-    <!-- Flash zprávy / Toast -->
-    <div n:foreach="$flashes as $flash" class="alert alert-{$flash->type} alert-dismissible fade show auto-dismiss my-3 shadow-sm" role="alert">
-        <i class="bi bi-check-circle-fill me-2"></i>
-        <strong>{$flash->message}</strong>
-        <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
-    </div>
-
     <!-- Vyhledávací a filtrační lišta nad tabulkou -->
     <div class="content-card my-3">
         <form n:attr="method => 'get', action => $presenter->link('Zakaznik:default')" class="row g-2 align-items-center">
@@ -134,17 +127,4 @@
         </div>
     </div>
 
-</div>
-
-<script>
-    document.addEventListener('DOMContentLoaded', () => {
-        const alerts = document.querySelectorAll('.alert.auto-dismiss');
-        alerts.forEach(alert => {
-            setTimeout(() => {
-                alert.classList.remove('show');
-                alert.classList.add('fade');
-                setTimeout(() => alert.remove(), 500);
-            }, 3000);
-        });
-    });
-</script>
\ No newline at end of file
+</div>
\ No newline at end of file
diff --git a/sql/KufrikDB.sql b/sql/KufrikDB.sql
index 60beb29..1c10be4 100644
--- a/sql/KufrikDB.sql
+++ b/sql/KufrikDB.sql
@@ -206,9 +206,9 @@ CREATE TABLE [dbo].[FAKTURA](
     [D_MESTO] [nvarchar](50) NULL,
     [D_PSC] [nvarchar](50) NULL,
     [D_IC] [nvarchar](8) NULL,
-    [D_DIC] [nvarchar](10) NULL,
+    [D_DIC] [nvarchar](12) NULL,                     -- shodně s FIRMA.DIC
     [D_BANKA] [nvarchar](100) NULL,
-    [D_TELEFON] [nvarchar](15) NULL,
+    [D_TELEFON] [nvarchar](20) NULL,                  -- shodně s FIRMA.TELEFON
     [D_EMAIL] [nvarchar](100) NULL,
     [D_WEB] [nvarchar](100) NULL,
 
diff --git a/sql/widen_faktura_snapshot_dic.sql b/sql/widen_faktura_snapshot_dic.sql
new file mode 100644
index 0000000..2bbca5a
--- /dev/null
+++ b/sql/widen_faktura_snapshot_dic.sql
@@ -0,0 +1,14 @@
+-- Sjednocení délky DIČ / telefonu snapshotu dodavatele s tabulkou FIRMA.
+-- Spouštět v každé klientské databázi (např. kufrik).
+
+IF COL_LENGTH('dbo.FAKTURA', 'D_DIC') IS NOT NULL
+BEGIN
+    ALTER TABLE dbo.FAKTURA ALTER COLUMN [D_DIC] [nvarchar](12) NULL;
+END
+GO
+
+IF COL_LENGTH('dbo.FAKTURA', 'D_TELEFON') IS NOT NULL
+BEGIN
+    ALTER TABLE dbo.FAKTURA ALTER COLUMN [D_TELEFON] [nvarchar](20) NULL;
+END
+GO
diff --git a/www/css/layout.css b/www/css/layout.css
index 8295910..717dcdd 100644
--- a/www/css/layout.css
+++ b/www/css/layout.css
@@ -383,6 +383,24 @@ body {
     color: #2f6b58;
 }
 
+/* Flash / toast — vrstva nad obsahem, neovlivní layout */
+.flash-toast-container {
+    position: fixed;
+    top: 4.75rem;
+    right: 1rem;
+    z-index: 1080;
+    width: min(28rem, calc(100vw - 2rem));
+    display: flex;
+    flex-direction: column;
+    gap: 0.5rem;
+    pointer-events: none;
+}
+.flash-toast-container .flash-toast {
+    pointer-events: auto;
+    margin-bottom: 0;
+    box-shadow: 0 0.5rem 1.25rem rgba(28, 43, 66, 0.18);
+}
+
 /* --- 7. JEMNĚJŠÍ PALETA NAD BOOTSTRAPEM --- */
 a {
     color: #1f62c0;