/* By default, elements are visible (for SEO and headless browser crawlers) */
.fade-in {
    opacity: 1;
}

/* Progressive enhancement: Only hide elements if JS is enabled */
.js-enabled .fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1.0s cubic-bezier(0.16, 1, 0.3, 1), transform 1.0s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Revealed state triggered by Scroll Observer */
.js-enabled .fade-in.revealed {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

.card-hover:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.gradient-text {
    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* Styles for Back to Top Button */
#back-to-top {
    transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
}