@keyframes fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .animate-fadeIn {
            animation: fadeIn 0.5s ease-out;
        }
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        .animate-spin {
            animation: spin 1s linear infinite;
        }
        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-15px); }
        }
        .animate-float {
            animation: float 3s ease-in-out infinite;
        }
        @keyframes twinkle {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.3; }
        }
        .star {
            position: absolute;
            width: 2px;
            height: 2px;
            background: white;
            border-radius: 50%;
            animation: twinkle 3s ease-in-out infinite;
        }
        body {
            background: linear-gradient(to bottom, #0a0e27 0%, #1a1a3e 50%, #2d1b4e 100%);
            position: relative;
            overflow-x: hidden;
        }
        .back-button {
            position: fixed;
            top: 20px;
            left: 20px;
            background: linear-gradient(135deg, rgba(139, 92, 246, 0.9) 0%, rgba(99, 102, 241, 0.9) 100%);
            backdrop-filter: blur(10px);
            color: white;
            padding: 12px 24px;
            border-radius: 12px;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            font-size: 14px;
            z-index: 1000;
            border: 1px solid rgba(139, 92, 246, 0.5);
            box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
            transition: all 0.3s ease;
        }
        .back-button:hover {
            transform: translateX(-5px);
            box-shadow: 0 6px 20px rgba(139, 92, 246, 0.6);
        }
        .back-button svg {
            transition: transform 0.3s ease;
        }
        .back-button:hover svg {
            transform: translateX(-3px);
        }