body {
            font-family: 'Inter', sans-serif;
        }

        .nav-link {
            position: relative;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: -5px;
            left: 50%;
            transform: translateX(-50%);
            background: linear-gradient(to right, #2563EB, #4F46E5);
            transition: width 0.3s ease;
            border-radius: 2px;
        }

        .nav-link:hover::after {
            width: 100%;
        }

        .dropdown-animation {
            animation: dropdownFade 0.2s ease-out;
        }

        @keyframes dropdownFade {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .glass-effect {
            backdrop-filter: blur(10px);
            background: rgba(255, 255, 255, 0.9);
        }

        /* header */
        @keyframes blob {
            0% {
                transform: translate(0px, 0px) scale(1);
            }

            33% {
                transform: translate(30px, -50px) scale(1.1);
            }

            66% {
                transform: translate(-20px, 20px) scale(0.9);
            }

            100% {
                transform: translate(0px, 0px) scale(1);
            }
        }

        .animate-blob {
            animation: blob 7s infinite;
        }

        .animation-delay-2000 {
            animation-delay: 2s;
        }

        .animation-delay-4000 {
            animation-delay: 4s;
        }

        /* icon hero section */
        @keyframes counterRotate {
            from {
                transform: rotate(0deg);
            }

            to {
                transform: rotate(-360deg);
            }
        }

        .rotate-icon {
            animation: counterRotate 2s linear infinite;
        }

        /* style chat container hero section */
        .chat-bubble-in {
            animation: bubbleIn 0.3s ease-out forwards;
        }

        .chat-bubble-out {
            animation: bubbleOut 0.3s ease-out forwards;
        }

        @keyframes bubbleIn {
            from {
                opacity: 0;
                transform: translateX(-20px);
            }

            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        @keyframes bubbleOut {
            from {
                opacity: 0;
                transform: translateX(20px);
            }

            to {
                opacity: 1;
                transform: translateX(0);
            }
        }
        .perspective-1000 {
            perspective: 1000px;
        }

        .transform-style-3d {
            transform-style: preserve-3d;
        }

        #rotating-container {
            position: relative;
            transform-style: preserve-3d;
        }

        #card-desktop,
        #card-web,
        #card-android,
        #card-ios {
            backface-visibility: hidden;
            transform-origin: center center -60px;
        }

        .card-back {
            filter: blur(2px);
            opacity: 0.7;
            transform: translateZ(-20px);
        }

        @keyframes cardRotate {
            0% {
                transform: rotateX(0deg) translateZ(60px);
                filter: blur(0);
                opacity: 1;
            }

            100% {
                transform: rotateX(-90deg) translateZ(60px);
                filter: blur(2px);
                opacity: 0.7;
            }
        }
        #position-left img,
        #position-top img,
        #position-right img,
        #position-bottom img {
            transition: all 0.5s ease-in-out;
        }