body {
    font-family: 'Inter', sans-serif;
    scroll-behavior: smooth;
    background-color: #f7fafc;
}
@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.fade-slide-in {
    animation: fadeSlideIn 1s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
    opacity: 0;
}
.tool-card {
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s;
}
.tool-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 25px -5px rgba(99, 102, 241, 0.2), 0 8px 10px -6px rgba(99, 102, 241, 0.1);
}
#menu-toggle:checked ~ #menu {
    display: block;
}
.main-btn{
    animation: focusbtn 1s ease infinite;
}
@keyframes focusbtn {
0% {
box-shadow: 0 0 0px rgba(67, 56, 202, 0.5);
}
50% {
box-shadow: 0 0 18px rgba(67, 56, 202, 0.9);
}
100% {
box-shadow: 0 0 0px rgba(67, 56, 202, 0.5);
}
}
.processing-pulse { animation: pulse-ring 2s infinite; }

/* Checkerboard pattern for transparent background visualization */
.checkerboard-bg {
    background-color: #ffffff;
    background-image: linear-gradient(45deg, #e5e7eb 25%, transparent 25%), 
                      linear-gradient(-45deg, #e5e7eb 25%, transparent 25%), 
                      linear-gradient(45deg, transparent 75%, #e5e7eb 75%), 
                      linear-gradient(-45deg, transparent 75%, #e5e7eb 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}