/* Custom animations and utilities */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes float-delay {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
}

.animate-float {
    animation: float 6s ease-in-out infinite;
}

.animate-float-delay {
    animation: float-delay 8s ease-in-out infinite;
    animation-delay: 1s;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f4f7f9;
}

::-webkit-scrollbar-thumb {
    background: #3fb39a;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #2d947f;
}

/* Navigation active state */
.nav-link.active {
    color: #3fb39a;
}

/* Input focus styles */
input:focus,
textarea:focus {
    box-shadow: 0 0 0 3px rgba(63, 179, 154, 0.2);
}

/* Image loading placeholder */
img {
    background: linear-gradient(90deg, #e3eaf0 25%, #f4f7f9 50%, #e3eaf0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

img[src] {
    animation: none;
    background: none;
}

/* Mobile menu transition */
#mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

#mobile-menu.open {
    max-height: 400px;
}

/* Fade in animation for sections */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Back to top button */
#back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}