* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #0d9488 0%, #06b6d4 50%, #0891b2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1rem;
            position: relative;
            overflow: hidden;
        }

        /* Animated background elements */
        body::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
            background-size: 50px 50px;
            animation: backgroundMove 20s linear infinite;
            pointer-events: none;
        }

        @keyframes backgroundMove {
            0% { transform: translate(0, 0); }
            100% { transform: translate(50px, 50px); }
        }

        .login-container {
            position: relative;
            z-index: 1;
            width: 100%;
            max-width: 440px;
        }

        .login-card {
            background: white;
            border-radius: 1.5rem;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            overflow: hidden;
            animation: slideUp 0.6s ease-out;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .card-header {
            background: linear-gradient(135deg, #0d9488 0%, #06b6d4 100%);
            padding: 2.5rem 2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .card-header::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
            animation: rotate 10s linear infinite;
        }

        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .logo-container {
            position: relative;
            z-index: 1;
            margin-bottom: 1rem;
        }

        .logo {
            max-width: 180px;
            height: auto;
            filter: brightness(0) invert(1);
        }

        .card-title {
            position: relative;
            z-index: 1;
            color: white;
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0;
            letter-spacing: -0.02em;
        }

        .card-body {
            padding: 2.5rem 2rem;
        }

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

        .form-label {
            display: block;
            font-size: 0.875rem;
            font-weight: 600;
            color: #374151;
            margin-bottom: 0.5rem;
        }

        .form-input {
            width: 100%;
            padding: 0.875rem 1rem;
            font-size: 0.9375rem;
            color: #1f2937;
            background: #f9fafb;
            border: 2px solid #e5e7eb;
            border-radius: 0.75rem;
            transition: all 0.2s;
            font-family: inherit;
        }

        .form-input:focus {
            outline: none;
            border-color: #0d9488;
            background: white;
            box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
        }

        .form-input::placeholder {
            color: #9ca3af;
        }

        .button-group {
            display: flex;
            gap: 0.75rem;
            margin-top: 2rem;
        }

        .btn {
            flex: 1;
            padding: 0.875rem 1.5rem;
            font-size: 0.9375rem;
            font-weight: 600;
            border: none;
            border-radius: 0.75rem;
            cursor: pointer;
            transition: all 0.2s;
            font-family: inherit;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .btn-primary {
            background: linear-gradient(135deg, #0d9488 0%, #06b6d4 100%);
            color: white;
            box-shadow: 0 4px 12px rgba(13, 148, 136, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(13, 148, 136, 0.4);
        }

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

        .btn-microsoft {
            background: white;
            color: #5e5e5e;
            border: 2px solid #e5e7eb;
            padding: 0.875rem 1rem;
            flex: 0 0 auto;
        }

        .btn-microsoft:hover {
            background: #f9fafb;
            border-color: #d1d5db;
        }

        .btn-microsoft svg {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
        }

        .divider {
            display: flex;
            align-items: center;
            text-align: center;
            margin: 1.5rem 0;
            color: #9ca3af;
            font-size: 0.875rem;
        }

        .divider::before,
        .divider::after {
            content: '';
            flex: 1;
            border-bottom: 1px solid #e5e7eb;
        }

        .divider span {
            padding: 0 1rem;
        }

        .card-footer {
            background: #f9fafb;
            padding: 1.5rem 2rem;
            text-align: center;
            border-top: 1px solid #e5e7eb;
        }

        .footer-text {
            font-size: 0.8125rem;
            color: #6b7280;
            margin: 0;
        }

        /* Responsive */
        @media (max-width: 480px) {
            .login-card {
                border-radius: 1rem;
            }

            .card-header {
                padding: 2rem 1.5rem;
            }

            .card-body {
                padding: 2rem 1.5rem;
            }

            .card-title {
                font-size: 1.25rem;
            }

            .button-group {
                flex-direction: column;
            }

            .btn-microsoft {
                flex: 1;
            }

            .logo {
                max-width: 150px;
            }
        }

        /* Loading state */
        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }

        /* Error message styling */
        .error-message {
            background: #fef2f2;
            border: 1px solid #fecaca;
            color: #dc2626;
            padding: 0.75rem 1rem;
            border-radius: 0.75rem;
            font-size: 0.875rem;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .error-message::before {
            content: '⚠';
            font-size: 1rem;
        }