* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: Arial, sans-serif;
            background-color: rgb(7, 38, 49);
            color: white;
            overflow-x: hidden;
        }

        /* Header styling */
        .header {
            background-color: #1a1a1a;
            color: white;
            padding: 12px 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            position: relative;
            z-index: 100;
        }
        /* Navigation styling */
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
            width: 100%;
        }
        /* Hamburger menu styling */
        .hamburger-menu {
            display: flex;
            flex-direction: column;
            cursor: pointer;
            width: 30px;
        }

        .hamburger-menu span {
            height: 3px;
            width: 100%;
            background-color: white;
            margin: 3px 0;
            transition: 0.3s;
        }

        /* Menu items */
        .menu-items {
            position: absolute;
            top: 60px;
            left: 20px;
            background-color: rgba(26, 26, 26, 0.95);
            border-radius: 5px;
            padding: 8px 0;
            display: none;
            flex-direction: column;
            min-width: 200px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
            z-index: 1000;
        }

        .menu-items.active {
            display: flex;
        }

        .menu-items a {
            padding: 10px 20px;
            text-decoration: none;
            color: white;
            transition: background-color 0.3s;
            border-bottom: 1px solid #333;
        }

        .menu-items a:last-child {
            border-bottom: none;
        }

        .menu-items a:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }

        /* User options */
        .user-options {
            position: relative;
        }

        .user-btn {
            background: none;
            border: none;
            color: white;
            cursor: pointer;
            padding: 6px 12px;
            border-radius: 4px;
            transition: background-color 0.3s;
            font-size: 14px;
        }

        .user-btn:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }

        .dropdown-menu {
            position: absolute;
            top: 40px;
            right: 0;
            background-color: #1a1a1a;
            border-radius: 5px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
            display: none;
            flex-direction: column;
            min-width: 160px;
            z-index: 1000;
        }

        .dropdown-menu.active {
            display: flex;
        }

        .dropdown-menu a {
            padding: 10px 15px;
            text-decoration: none;
            color: white;
            border-bottom: 1px solid #333;
            transition: background-color 0.3s;
            font-size: 14px;
        }

        .dropdown-menu a:last-child {
            border-bottom: none;
        }

        .dropdown-menu a:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }

        /* Main content area */
        .main-content {
            display: flex;
            min-height: calc(100vh - 60px);
            transition: all 0.3s ease;
        }

        /* Vertical tabs styling - collapsible */
        .vertical-tabs {
            width: 70px;
            background-color: #1a1a1a;
            border-right: 1px solid #333;
            height: calc(100vh - 60px);
            overflow-y: auto;
            display: flex;
            flex-direction: column;
            transition: all 0.3s ease;
            position: relative;
            z-index: 10;
        }

        .vertical-tabs.collapsed {
            transform: translateX(-100%);
            width: 0;
        }

        .tab-buttons {
            display: flex;
            flex-direction: column;
        }

        .tab-btn {
            background: none;
            border: none;
            padding: 15px;
            cursor: pointer;
            border-bottom: 1px solid #333;
            transition: background-color 0.3s;
            color: white;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 70px;
        }

        .tab-btn:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }

        .tab-btn.active {
            background-color: rgb(7, 38, 49);
            border-left: 4px solid #1a73e8;
        }

        .tab-icon {
            width: 24px;
            height: 24px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        /* Tab content area - adjusted spacing */
        .tab-content {
            flex: 1;
            padding: 20px;
            background-color: rgb(7, 38, 49);
            overflow-y: auto;
            transition: all 0.3s ease;
            position: relative;
        }

        .tab-content.expanded {
            margin-left: 0;
        }

        .tab-pane {
            display: none;
        }

        .tab-pane.active {
            display: block;
            animation: fadeIn 0.3s;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .tab-pane h2 {
            margin-bottom: 15px;
            color: white;
            border-bottom: 2px solid rgba(255, 255, 255, 0.2);
            padding-bottom: 8px;
            font-size: 1.5rem;
        }

        .tab-pane p {
            line-height: 1.5;
            margin-bottom: 12px;
            font-size: 14px;
        }

        .card {
            background: rgba(26, 26, 26, 0.7);
            border-radius: 6px;
            padding: 15px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            margin-bottom: 15px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .card h3 {
            margin-bottom: 8px;
            color: white;
            font-size: 1.1rem;
        }

        .card p {
            font-size: 13px;
            line-height: 1.4;
        }

        /* Sidebar toggle area - only visible when sidebar is collapsed */
        .sidebar-toggle-area {
            position: fixed;
            left: 0;
            top: 60px;
            width: 20px;
            height: calc(100vh - 60px);
            background-color: transparent;
            z-index: 5;
            cursor: pointer;
            display: none;
            transition: all 0.3s ease;
        }

        .sidebar-toggle-area.visible {
            display: block;
        }

        .sidebar-toggle-area:hover::after {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(26, 26, 26, 0.1);
        }


/* Hamburger menu styling */
        .hamburger-menu {
            display: flex;
            flex-direction: column;
            cursor: pointer;
            width: 30px;
        }

        .hamburger-menu span {
            height: 3px;
            width: 100%;
            background-color: white;
            margin: 3px 0;
            transition: 0.3s;
        }

        /* Menu items */
        .menu-items {
            position: absolute;
            top: 60px;
            left: 20px;
            background-color: rgba(255, 255, 255, 0.9);
            border-radius: 5px;
            padding: 10px 0;
            display: none;
            flex-direction: column;
            min-width: 150px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }

        .menu-items.active {
            display: flex;
        }

        .menu-items a {
            padding: 10px 20px;
            text-decoration: none;
            color: rgb(7, 38, 49);
            transition: background-color 0.3s;
        }

        .menu-items a:hover {
            background-color: rgba(7, 38, 49, 0.1);
        }

        /* User login icon */
        .user-login {
            display: flex;
            align-items: center;
        }

        .user-login a {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: white;
            font-weight: bold;
        }

        .user-icon {
            width: 30px;
            height: 30px;
            background-color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-left: 10px;
            color: rgb(7, 38, 49);
            font-weight: bold;
        }

        /* Logo styling */
        .logo-container {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .logo {
            max-width: 80%;
            height: auto;
            max-height: 70vh;
        }