body { font-family: 'Inter', sans-serif; }
        .gradient-bg { background: linear-gradient(135deg, #1e3a8a 0%, #3730a3 50%, #581c87 100%); }
        .light-pollution { background: radial-gradient(circle at 30% 20%, rgba(255, 255, 0, 0.1) 0%, transparent 50%), radial-gradient(circle at 70% 80%, rgba(255, 165, 0, 0.1) 0%, transparent 50%); }
        .modal-backdrop { backdrop-filter: blur(4px); }
        .fade-in { animation: fadeIn 0.3s ease-in; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
        .slide-up { animation: slideUp 0.4s ease-out; }
        @keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }