body {
            background-color: #0b131f;
            color: #e2e8f0;
            font-family: 'Inter', sans-serif;
            overflow-x: hidden;
        }

        /* Custom scrollbar */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: #0b131f;
        }
        ::-webkit-scrollbar-thumb {
            background: #1e3048;
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #10b981;
        }

        /* 3D Flip Card Effect */
        .perspective-1000 {
            perspective: 1000px;
        }
        .flip-card-inner {
            position: relative;
            width: 100%;
            height: 100%;
            text-align: center;
            transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
            transform-style: preserve-3d;
        }
        .flip-card:hover .flip-card-inner, .flip-card:focus .flip-card-inner {
            transform: rotateY(180deg);
        }
        .flip-card-front, .flip-card-back {
            position: absolute;
            width: 100%;
            height: 100%;
            -webkit-backface-visibility: hidden;
            backface-visibility: hidden;
            border-radius: 1rem;
        }
        .flip-card-back {
            transform: rotateY(180deg);
        }

        /* Hotspot Ripple Effect */
        @keyframes pulse-ring {
            0% { transform: scale(0.95); opacity: 0.8; }
            50% { transform: scale(1.4); opacity: 0.3; }
            100% { transform: scale(0.95); opacity: 0.8; }
        }
        .hotspot-pulse {
            animation: pulse-ring 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }

        /* Scanline animation for body organ container */
        @keyframes scanline {
            0% { top: 0%; opacity: 0.6; }
            50% { opacity: 0.3; }
            100% { top: 100%; opacity: 0.6; }
        }
        .scanline {
            position: absolute;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, transparent, #10b981, transparent);
            animation: scanline 4s linear infinite;
        }