*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Nav scroll state */
#site-header {
    transition: background-color 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
}

#site-header.scrolled {
    background-color: rgba(254, 252, 248, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(5, 150, 105, 0.08), 0 4px 20px rgba(0, 0, 0, 0.04);
}

.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: currentColor;
    transition: width 0.25s ease;
    border-radius: 1px;
}

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

/* Mobile menu */
#mobile-menu {
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Reveal animations — progressive enhancement */
.reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Default state for reduced-motion users: always visible */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(24px);
    }

    .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }

    .reveal.delay-100 { transition-delay: 100ms; }
    .reveal.delay-200 { transition-delay: 200ms; }
    .reveal.delay-300 { transition-delay: 300ms; }
}

/* Card hover */
.card {
    will-change: transform;
}

.card:hover .card-img {
    transform: scale(1.05);
}

/* Focus styles */
a:focus-visible,
button:focus-visible {
    outline: 2px solid #059669;
    outline-offset: 2px;
    border-radius: 4px;
}

/* Selection */
::selection {
    background-color: rgba(5, 150, 105, 0.2);
    color: #064E3B;
}

/* Smooth image loading */
img {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Subtle gradient on hero text */
.hero h1 {
    text-shadow: 0 2px 40px rgba(0, 0, 0, 0.3);
}