* {
            box-sizing: border-box;
        }

        body {
            background: linear-gradient(135deg, #0e0c28 0%, #1a1a2e 50%, #16213e 100%);
            min-height: 100vh;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0;
            padding: 20px;
        }

        .login-container {
            width: 100%;
            max-width: 420px;
        }

        .login-card {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(15px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 16px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            padding: 2.5rem;
            position: relative;
            overflow: hidden;
        }

        .login-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
        }

        .brand-section {
            text-align: center;
            margin-bottom: 2rem;
        }

        .brand-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
            border-radius: 12px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1rem;
            box-shadow: 0 4px 15px rgba(52, 152, 219, 0.2);
        }

        .brand-icon i {
            color: #ffffff;
            font-size: 1.8rem;
        }

        .card-title {
            color: #ffffff;
            font-size: 1.5rem;
            font-weight: 600;
            margin: 0;
            letter-spacing: -0.5px;
        }

        .card-subtitle {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            margin-top: 0.5rem;
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        .form-label {
            color: rgba(255, 255, 255, 0.8);
            font-weight: 500;
            margin-bottom: 0.5rem;
            font-size: 0.875rem;
            display: block;
        }

        .input-wrapper {
            position: relative;
        }

        .form-control {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 8px;
            color: #ffffff;
            padding: 0.875rem 1rem 0.875rem 2.5rem;
            font-size: 0.95rem;
            transition: all 0.3s ease;
            width: 100%;
        }

        .form-control:focus {
            background: rgba(255, 255, 255, 0.12);
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
            color: #ffffff;
            outline: none;
        }

        .form-control::placeholder {
            color: rgba(255, 255, 255, 0.4);
        }

        .input-icon {
            position: absolute;
            left: 0.875rem;
            top: 50%;
            transform: translateY(-50%);
            color: rgba(255, 255, 255, 0.5);
            font-size: 1rem;
            pointer-events: none;
        }

        .btn-login {
            background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
            border: none;
            border-radius: 8px;
            color: #ffffff;
            font-weight: 600;
            padding: 0.875rem 2rem;
            font-size: 0.95rem;
            text-transform: none;
            letter-spacing: 0.25px;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            width: 100%;
            cursor: pointer;
        }

        .btn-login:hover {
            background: linear-gradient(135deg, #34495e 0%, #2980b9 100%);
            transform: translateY(-1px);
            box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
        }

        .btn-login:active {
            transform: translateY(0);
        }

        .btn-login:disabled {
            opacity: 0.7;
            cursor: not-allowed;
            transform: none;
        }

        .alert-danger {
            background: rgba(231, 76, 60, 0.1);
            border: 1px solid rgba(231, 76, 60, 0.2);
            color: #e74c3c;
            border-radius: 8px;
            padding: 0.875rem;
            font-size: 0.875rem;
            margin-top: 1rem;
        }

        .loading-spinner {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: #ffffff;
            animation: spin 1s ease-in-out infinite;
            margin-right: 0.5rem;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .divider {
            display: flex;
            align-items: center;
            margin: 1.5rem 0;
        }

        .divider::before,
        .divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background: rgba(255, 255, 255, 0.1);
        }

        .divider span {
            padding: 0 1rem;
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.8rem;
        }

        .footer-links {
            text-align: center;
            margin-top: 1.5rem;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
            font-size: 0.85rem;
            transition: color 0.3s ease;
        }

        .footer-links a:hover {
            color: #3498db;
        }

        /* Responsive design */
        @media (max-width: 480px) {
            body {
                padding: 15px;
            }

            .login-card {
                padding: 2rem;
            }

            .card-title {
                font-size: 1.3rem;
            }
        }

        /* Security indicator */
        .security-badge {
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.8rem;
            margin-top: 1rem;
        }

        .security-badge i {
            margin-right: 0.5rem;
            color: #27ae60;
        }