:root {
            --primary: #6366f1;      /* Indigo */
            --primary-hover: #4f46e5;
            --bg-color: #f8fafc;
            --text-dark: #334155;
            --text-light: #64748b;
            --white: #ffffff;
            --danger: #ef4444;
            --border-light: #e2e8f0;
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--bg-color);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            margin: 0;
            position: relative;
            overflow: hidden;
            justify-content: center;
            align-items: center;
        }

        /* Abstract Background representing Data/Monitoring */
        .bg-grid {
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            background-image: 
                radial-gradient(rgba(15, 23, 42, 0.1) 2px, transparent 2px);
            background-size: 30px 30px;
            z-index: -2;
        }

        /* Main Container */
        .main-wrapper {
            width: 100%;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            z-index: 10;
        }

        .auth-card {
            background: var(--white);
            border-radius: 12px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
            width: 100%;
            max-width: 400px;
            padding: 40px;
            box-sizing: border-box;
        }

        .card-title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-dark);
            text-align: center;
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .card-subtitle {
            font-size: 1rem;
            color: var(--text-dark);
            margin-bottom: 15px;
            font-weight: 500;
            line-height: 1.4;
        }

        .card-divider {
            height: 1px;
            background-color: var(--border-light);
            margin-bottom: 15px;
        }

        .card-desc {
            font-size: 0.875rem;
            color: var(--text-light);
            margin-bottom: 25px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-label {
            display: block;
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .input-group-custom {
            display: flex;
            align-items: center;
            border: 1px solid var(--border-light);
            border-radius: 8px;
            padding: 10px 15px;
            background-color: #fff;
            transition: all 0.3s ease;
        }

        .input-group-custom:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
        }

        .input-field {
            flex: 1;
            border: none;
            outline: none;
            background: transparent;
            font-family: inherit;
            font-size: 0.95rem;
            color: var(--text-dark);
            padding: 2px 0;
            width: 100%;
        }

        .input-field::placeholder {
            color: #94a3b8;
            font-weight: 400;
        }

        .password-toggle {
            color: #94a3b8;
            cursor: pointer;
            font-size: 1.2rem;
            transition: color 0.2s ease;
            margin-left: 10px;
        }
        
        .password-toggle:hover {
            color: var(--text-dark);
        }

        /* Button Styling */
        .btn-submit {
            background-color: var(--primary);
            color: white;
            border: none;
            border-radius: 8px;
            width: 100%;
            padding: 12px;
            font-family: inherit;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.2s ease;
            margin-top: 10px;
        }

        .btn-submit:hover {
            background-color: var(--primary-hover);
        }

        /* Error Alert */
        .alert-error {
            background-color: #fef2f2;
            color: var(--danger);
            padding: 12px 16px;
            border-radius: 8px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 8px;
            border: 1px solid #fee2e2;
        }

        @media (max-width: 576px) {
            .auth-card { padding: 30px 25px; border-radius: 16px; }
        }