body { font-family: 'Inter', sans-serif; background-color: #F1F5F9; }
        
        .gradient-header {
            background: linear-gradient(135deg, #4F46E5 0%, #2563EB 100%);
        }
        
        /* Animation */
        .fade-in { animation: fadeIn 0.5s ease-out forwards; }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Tabs */
        .tab-btn { position: relative; transition: all 0.3s; opacity: 0.6; }
        .tab-btn.active { opacity: 1; color: #2563EB; }
        .tab-btn.active::after {
            content: ''; position: absolute; bottom: 0; left: 20%; right: 20%;
            height: 3px; background-color: #2563EB; border-radius: 99px;
        }
        
        .hidden-content { display: none; }