body {
            font-family: 'Courier New', Courier, monospace;
            background-color: #0d0d0d;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            -webkit-tap-highlight-color: transparent;
        }
        .login-container {
            background-color: #1a1a1a;
            padding: 40px;
            border: 1px solid #333;
            box-shadow: 0 0 15px rgba(0,0,0,0.5);
            width: 100%;
            max-width: 400px;
            text-align: center;
        }
        .login-header {
            margin-bottom: 30px;
        }
        .login-header h1 {
            color: #4caf50;
            margin: 0 0 10px 0;
            font-size: 2em;
        }
        .login-header p {
            color: #e0e0e0;
            margin: 0;
        }
        .form-group {
            margin-bottom: 20px;
            text-align: left;
        }
        .form-group label {
            display: block;
            margin-bottom: 5px;
            color: #e0e0e0;
            font-weight: bold;
        }
        .form-group input {
            width: 100%;
            padding: 12px;
            border: 1px solid #555;
            background-color: #0d0d0d;
            color: #e0e0e0;
            font-size: 16px;
            box-sizing: border-box;
            transition: border-color 0.3s;
        }
        .form-group input:focus {
            outline: none;
            border-color: #4caf50;
        }
        .login-btn {
            width: 100%;
            padding: 12px;
            background-color: #4caf50;
            color: #0d0d0d;
            border: 1px solid #4caf50;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.3s, color 0.3s, border-color 0.3s;
        }
        .login-btn:hover {
            background-color: #333;
            color: #e0e0e0;
            border-color: #555;
        }
        .login-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            background-color: #333;
            color: #e0e0e0;
            border-color: #555;
        }
        .error-message {
            background-color: #333;
            border: 1px solid #e74c3c;
            color: #e74c3c;
            padding: 10px;
            margin-bottom: 20px;
            display: none;
        }
        .back-link {
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid #333;
        }
        .back-link a {
            color: #4caf50;
            text-decoration: none;
            font-size: 14px;
        }
        .back-link a:hover {
            text-decoration: underline;
            color: #e0e0e0;
        }
        .admin-icon {
            font-size: 3em;
            margin-bottom: 20px;
            color: #4caf50;
        }