/* ── Base & Utilities ── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

/* ── Header scroll state ── */
#site-header { background: transparent; }
#site-header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(0,0,0,0.06);
}

/* ── Nav links ── */
.nav-link { position: relative; }
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: #0d9488;
    transition: width 0.2s ease;
}
.nav-link:hover::after { width: 100%; }

/* ── Mobile menu ── */
#mobile-menu { animation: slideDown 0.25s ease; }
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}
.mobile-link { transition: color 0.15s ease; }

/* ── Service cards ── */
.service-card { transform: translateY(0); }
.service-card:hover { transform: translateY(-4px); }

/* ── Scroll animations ── */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ── Button focus rings ── */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid #0d9488;
    outline-offset: 2px;
}

/* ── Selection ── */
::selection { background: rgba(13, 148, 136, 0.2); }