/* ─── Base ─── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; }

/* ─── Reveal animation (progressive enhancement) ─── */
.reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(24px);
    }
    .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    .service-card {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.5s ease, transform 0.5s ease, border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
    }
    .service-card.revealed {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ─── Nav link underline on hover ─── */
.nav-link {
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: #0d9488;
    transition: width 0.25s ease;
}
.nav-link:hover::after {
    width: 100%;
}

/* ─── Mobile nav link ─── */
.mobile-nav-link {
    position: relative;
    padding-left: 0;
}

/* ─── Input focus styles ─── */
input:focus, select:focus, textarea:focus {
    outline: none;
}

/* ─── Custom scrollbar ─── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #f8fafc; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

/* ─── Navbar shadow on scroll ─── */
header.scrolled {
    box-shadow: 0 1px 20px rgba(0,0,0,0.06);
}

/* ─── Selection color ─── */
::selection {
    background: #ccfbf1;
    color: #134e4a;
}