* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: Arial, sans-serif;
            background: #2c3e50;
            color: #333;
        }
        
        header {
            background: #2c3e50;
            color: white;
            padding: 20px;
            text-align: center;
            position: relative;
        }
        
        .mobile-menu-btn {
            display: none;
            position: absolute;
            top: 20px;
            background: #14191f;
            color: white;
            border: none;
            padding: 10px 15px;
            cursor: pointer;
            border-radius: 4px;
            font-size: 20px;
            z-index: 100;
        }
        
        .mobile-menu-btn:hover {
            background: #2c3e50;
        }
        
        .menu-left {
            left: 20px;
        }
        
        .menu-right {
            right: 20px;
        }
        
        .menu-center {
            left: 50%;
            transform: translateX(-50%);
        }
        
        .mobile-sidebar {
            display: none;
            position: fixed;
            color:  #fff;
            top: 0;
            width: 280px;
            height: 100%;
            background: #161f28;
            box-shadow: 2px 0 10px rgba(0,0,0,0.3);
            z-index: 1000;
            overflow-y: auto;
            padding: 20px;
            transition: transform 0.3s ease;
        }
        
        .mobile-sidebar.left {
            left: 0;
            transform: translateX(-100%);
        }
        
        .mobile-sidebar.center {
            left: 50%;
            transform: translateX(-50%) translateY(-100%);
            width: 90%;
            max-width: 400px;
            top: 70px;
            height: auto;
            max-height: 80vh;
            border-radius: 8px;
        }
        
        .mobile-sidebar.center.active {
            transform: translateX(-50%) translateY(0);
        }
        
        .mobile-sidebar.right {
            right: 0;
            transform: translateX(100%);
        }
        
        .mobile-sidebar.active {
            display: block;
            transform: translateX(0);
        }
        
        .mobile-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 999;
        }
        
        .mobile-overlay.active {
            display: block;
        }
        
        .sidebar-close {
            position: absolute;
            top: 10px;
            right: 10px;
            background: #e74c3c;
            color: white;
            border: none;
            padding: 5px 10px;
            cursor: pointer;
            border-radius: 4px;
            font-size: 18px;
        }
        
        .mobile-nav-item {
            padding: 12px 0;
            border-bottom: 1px solid #eee;
            color:  #fff;
        }
        
        .mobile-nav-item a {
            color: #ffffff;
            text-decoration: none;
            display: block;
            font-size: 16px;
        }
        
        .mobile-nav-item.has-submenu > a {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .mobile-submenu {
            display: none;
            padding-left: 20px;
            margin-top: 10px;
        }
        
        .mobile-submenu.show {
            display: block;
        }
        
        .mobile-submenu a {
            padding: 8px 0;
            display: block;
            color: #7f8c8d;
            font-size: 14px;
        }
        
        nav {
            background: #14191f;
            padding: 10px;
            text-align: center;
            position: relative;
        }
        
        nav a {
            color: white;
            text-decoration: none;
            margin: 0 15px;
            padding: 8px 15px;
            border-radius: 4px;
            display: inline-block;
            position: relative;
        }
        
        nav a:hover {
            background: #2c3e50;
        }
        
        .nav-item {
            display: inline-block;
            position: relative;
        }
        
        .dropdown-toggle {
            cursor: pointer;
        }
        
        .dropdown-menu {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            background: #2c3e50;
            min-width: 200px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
            border-radius: 4px;
            margin-top: 5px;
            z-index: 1000;
        }
        
        .dropdown-menu.show {
            display: block;
        }
        
        .nav-item:hover .dropdown-menu {
            display: block;
        }
        
        .dropdown-menu a {
            display: block;
            margin: 0;
            padding: 10px 15px;
            border-radius: 0;
        }
        
        .dropdown-menu a:hover {
            background: #34495e;
        }
        
        .container {
            max-width: 1400px;
            margin: 20px auto;
            padding: 0 20px;
        }
        
        .three-column {
            display: grid;
            grid-template-columns: 250px 1fr 250px;
            gap: 20px;
            margin-top: 20px;
        }
        
        .box {
            background: #14191f;
            color:  #fff;
            padding: 2px;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            margin-bottom: 20px;
        }
        
        .box h3 {
            margin-bottom: 15px;
            color: #a3d1ff;
            border-bottom: 2px solid #3498db;
            padding: 20px;
            padding-bottom: 10px;
        }
        
        .main-content {
            min-height: 400px;
        }
        
        .login-form {
            max-width: 400px;
            margin: 50px auto;
        }
        
        .form-group {
            margin-bottom: 15px;
        }
        
        label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
        }
        
        input[type="text"],
        input[type="password"],
        textarea {
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 14px;
        }
        
        textarea {
            min-height: 300px;
            font-family: monospace;
        }
        
        button {
            background: #3498db;
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 14px;
        }
        
        button:hover {
            background: #2980b9;
        }
        
        .btn-danger {
            background: #e74c3c;
        }
        
        .btn-danger:hover {
            background: #c0392b;
        }
        
        .page-list {
            list-style: none;
        }
        
        .page-list li {
            padding: 10px;
            border-bottom: 1px solid #eee;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .alert {
            padding: 15px;
            margin-bottom: 20px;
            border-radius: 4px;
        }
        
        .alert-success {
            background: #d4edda;
            color: #155724;
            border: 1px solid #c3e6cb;
        }
        
        .alert-error {
            background: #f8d7da;
            color: #721c24;
            border: 1px solid #f5c6cb;
        }
        
        footer {
            background: #14191f;
            color: white;
            padding: 30px 20px;
            margin-top: 50px;
            text-align: center;
        }
        
        footer a {
            color: #3498db;
            text-decoration: none;
            margin: 0 15px;
        }
        
        footer a:hover {
            text-decoration: underline;
        }
        
        .footer-year {
            margin-top: 15px;
            color: #95a5a6;
            font-size: 14px;
        }
        
        .footer-admin {
            margin-bottom: 20px;
        }
        
        .footer-link-item {
            display: flex;
            gap: 10px;
            margin-bottom: 10px;
            align-items: center;
        }
        
        .footer-link-item input {
            flex: 1;
        }
        
        .btn-small {
            padding: 5px 10px;
            font-size: 12px;
        }
        
        @media (max-width: 900px) {
            .three-column {
                grid-template-columns: 1fr;
            }
            
            .sidebar-left,
            .sidebar-right {
                display: none;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            nav {
                display: none;
            }
            
            header h1 {
                font-size: 18px;
                padding: 0 120px;
            }
        }