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diff --git a/partials/header.php b/partials/header.php
index 6da064a..2a19e2b 100644
--- a/partials/header.php
+++ b/partials/header.php
@@ -12,7 +12,262 @@ $page_title = isset($title) ? htmlspecialchars($title) : 'Multi-Company Dashboar
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap" rel="stylesheet">
     <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css">
-    <link rel="stylesheet" href="assets/css/custom.css?v=<?php echo time(); ?>">
+    <style>
+        /*
+-------------------------------------
+| Modern App UI - Visual Overhaul
+-------------------------------------
+*/
+
+/* --- Fonts & Imports --- */
+@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');
+
+/* --- CSS Variables (New Design System) --- */
+:root {
+    --primary-hue: 210;
+    --primary-saturation: 79%;
+    --primary-lightness: 45%;
+    
+    --primary: hsl(var(--primary-hue), var(--primary-saturation), var(--primary-lightness)); /* #2c5282 */
+    --primary-light: hsl(var(--primary-hue), var(--primary-saturation), 65%);
+    --primary-dark: hsl(var(--primary-hue), var(--primary-saturation), 30%);
+    --primary-bg: hsl(var(--primary-hue), 80%, 97%);
+
+    --secondary-hue: 152;
+    --secondary-saturation: 51%;
+    --secondary-lightness: 35%;
+    --secondary: hsl(var(--secondary-hue), var(--secondary-saturation), var(--secondary-lightness)); /* #2f855a */
+
+    --bg-color: #f7fafc;
+    --sidebar-bg: #ffffff;
+    --card-bg: #ffffff;
+    --text-primary: #1a202c;
+    --text-secondary: #718096;
+    --border-color: #e2e8f0;
+
+    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px 0 rgba(0, 0, 0, 0.03);
+    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
+    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.07), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
+
+    --border-radius-md: 0.5rem;
+    --border-radius-lg: 0.75rem;
+
+    --transition-speed: 0.2s;
+}
+
+/* --- Base & Typography --- */
+body {
+    background-color: var(--bg-color);
+    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+    color: var(--text-primary);
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+}
+
+h1, h2, h3, h4, h5, h6 {
+    font-weight: 600;
+    color: var(--text-primary);
+}
+
+p {
+    color: var(--text-secondary);
+    line-height: 1.6;
+}
+
+/* --- Layout --- */
+#wrapper {
+    display: flex;
+    width: 100%;
+}
+
+#sidebar-wrapper {
+    width: 260px;
+    background-color: var(--sidebar-bg);
+    border-right: 1px solid var(--border-color);
+    transition: margin var(--transition-speed) ease-in-out;
+    z-index: 1000;
+    box-shadow: var(--shadow-sm);
+}
+
+#page-content-wrapper {
+    flex: 1;
+    min-width: 0;
+    display: flex;
+    flex-direction: column;
+}
+
+main {
+    flex-grow: 1;
+    padding: 2rem;
+}
+
+
+/* --- Sidebar --- */
+.sidebar-heading {
+    padding: 1.5rem 1.5rem;
+    font-size: 1.2rem;
+    font-weight: 700;
+    color: var(--primary);
+    border-bottom: 1px solid var(--border-color);
+    text-align: left;
+}
+
+.sidebar-heading .logo-icon {
+    margin-right: 0.75rem;
+    font-size: 1.5rem;
+    vertical-align: middle;
+}
+
+.list-group-item {
+    background: transparent;
+    border: 0;
+    padding: 1rem 1.5rem;
+    font-size: 0.95rem;
+    font-weight: 500;
+    color: var(--text-secondary);
+    transition: all var(--transition-speed) ease;
+    border-left: 3px solid transparent;
+}
+
+.list-group-item .bi {
+    margin-right: 1rem;
+    font-size: 1.1rem;
+    vertical-align: text-bottom;
+}
+
+.list-group-item:hover {
+    color: var(--primary);
+    background-color: var(--primary-bg);
+}
+
+.list-group-item.active {
+    background-color: var(--primary-bg);
+    color: var(--primary);
+    border-left-color: var(--primary);
+    font-weight: 600;
+}
+
+/* --- Top Bar --- */
+#topbar {
+    background-color: var(--sidebar-bg);
+    border-bottom: 1px solid var(--border-color);
+    box-shadow: var(--shadow-sm);
+    padding: 0.75rem 2rem;
+}
+#topbar .navbar-toggler {
+    border: none;
+}
+#topbar .nav-link {
+    color: var(--text-secondary);
+}
+#topbar .dropdown-toggle::after {
+    display: none;
+}
+#topbar .profile-pic {
+    width: 40px;
+    height: 40px;
+    object-fit: cover;
+}
+
+
+/* --- Dashboard & Cards --- */
+.card.dashboard-card {
+    border: none;
+    background-color: var(--card-bg);
+    border-radius: var(--border-radius-lg);
+    box-shadow: var(--shadow-md);
+    transition: all var(--transition-speed) ease-in-out;
+    overflow: hidden;
+}
+
+.card.dashboard-card:hover {
+    transform: translateY(-4px);
+    box-shadow: var(--shadow-lg);
+}
+
+.card-body {
+    padding: 2rem;
+}
+
+.card-title-wrapper {
+    display: flex;
+    align-items: flex-start;
+    margin-bottom: 1.25rem;
+}
+
+.card-icon {
+    width: 48px;
+    height: 48px;
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    border-radius: var(--border-radius-md);
+    font-size: 1.5rem;
+    margin-right: 1.5rem;
+    flex-shrink: 0;
+}
+
+.card-icon.icon-customs {
+    background-color: hsl(var(--primary-hue), 80%, 97%);
+    color: var(--primary);
+}
+.card-icon.icon-insurance {
+    background-color: hsl(var(--secondary-hue), 80%, 96%);
+    color: var(--secondary);
+}
+.card-icon.icon-transport {
+    background-color: hsl(195, 70%, 96%);
+    color: hsl(195, 60%, 45%);
+}
+
+.card-title {
+    font-size: 1.25rem;
+    font-weight: 600;
+    margin-bottom: 0.25rem;
+}
+
+.card-text {
+    font-size: 0.95rem;
+    margin-bottom: 1.5rem;
+}
+
+.btn-primary {
+    background-color: var(--primary);
+    border-color: var(--primary);
+    font-weight: 500;
+    transition: all var(--transition-speed) ease;
+}
+.btn-primary:hover {
+    background-color: var(--primary-dark);
+    border-color: var(--primary-dark);
+}
+
+/* --- Responsive --- */
+@media (max-width: 767.98px) {
+    #sidebar-wrapper {
+        margin-left: -260px;
+    }
+
+    #wrapper.toggled #sidebar-wrapper {
+        margin-left: 0;
+    }
+
+    #page-content-wrapper {
+        min-width: 100vw;
+    }
+    
+    main {
+        padding: 1rem;
+    }
+    #topbar{
+        padding: 0.75rem 1rem;
+    }
+}
+
+#wrapper.toggled #sidebar-wrapper {
+    margin-left: -260px;
+}
+    </style>
 </head>
 <body>
-<div class="d-flex" id="wrapper">
+<div class="d-flex" id="wrapper">
\ No newline at end of file