    <style>
        /* Mapped directly to your premium baseline responsive CSS guidelines */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            color: #333;
            background-color: #1a202c; /* High contrast dark background for master admin isolation */
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            padding: 20px;
        }

        .admin-login-card {
            background-color: #ffffff;
            padding: 40px 35px;
            border-radius: 8px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.3);
            width: 100%;
            max-width: 450px;
            text-align: center;
            border-top: 5px solid #ba220b;
        }

        .brand-title {
            font-size: 28px;
            font-weight: bold;
            color: #2c3e50;
            margin-bottom: 5px;
        }

        .brand-title span {
            color: #ba220b;
        }

        .admin-login-card h3 {
            margin-bottom: 30px;
            color: #718096;
            font-size: 13px;
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .input-group-wrapper {
            margin-bottom: 20px;
            text-align: left;
        }

        .input-group-wrapper label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #2c3e50;
            font-size: 14px;
        }

        .admin-custom-input {
            padding: 12px;
            border: 1px solid #cbd5e0;
            border-radius: 5px;
            font-size: 16px;
            width: 100%;
            transition: border-color 0.3s, box-shadow 0.3s;
        }

        .admin-custom-input:focus {
            outline: none;
            border-color: #ba220b;
            box-shadow: 0 0 0 3px rgba(186, 34, 11, 0.1);
        }

        .btn-admin-auth {
            display: inline-block;
            padding: 14px 30px;
            background-color: #ba220b;
            color: white;
            text-decoration: none;
            border-radius: 5px;
            font-weight: bold;
            transition: background 0.3s;
            border: none;
            cursor: pointer;
            width: 100%;
            font-size: 16px;
            margin-top: 10px;
            letter-spacing: 0.5px;
        }

        .btn-admin-auth:hover {
            background-color: #961b08;
        }

        /* Alert notifications */
        .alert-box {
            padding: 12px 15px;
            margin-bottom: 25px;
            border-radius: 5px;
            font-weight: 600;
            text-align: center;
            font-size: 14px;
        }

        .alert-danger-zone {
            background-color: #fff5f5;
            color: #c53030;
            border: 1px solid #feb2b2;
        }

        .alert-success-zone {
            background-color: #f0fff4;
            color: #2f855a;
            border: 1px solid #9ae6b4;
        }
    </style>
