/* ── Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #060B18; }
::-webkit-scrollbar-thumb { background: #4FE8A8/30; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(79, 232, 168, 0.5); }

/* ── Nav transition ── */
#nav.scrolled {
    background: rgba(6, 11, 24, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

/* ── Mobile menu ── */
#mobileMenu.open {
    opacity: 1;
    pointer-events: all;
}
#mobileMenu.open .mobile-link {
    animation: fadeUp 0.3s ease forwards;
}
#mobileMenu.open .mobile-link:nth-child(1) { animation-delay: 0.05s; }
#mobileMenu.open .mobile-link:nth-child(2) { animation-delay: 0.1s; }
#mobileMenu.open .mobile-link:nth-child(3) { animation-delay: 0.15s; }
#mobileMenu.open .mobile-link:nth-child(4) { animation-delay: 0.2s; }

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Hamburger ── */
.menu-line { transition: transform 0.3s ease, opacity 0.3s ease; }
body.menu-open .menu-line:nth-child(1) { transform: translateY(4px) rotate(45deg); }
body.menu-open .menu-line:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }

/* ── Service cards ── */
.service-card { position: relative; overflow: hidden; }
.service-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: linear-gradient(90deg, #4FE8A8, #1ED790);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}
.service-card:hover::after { transform: scaleX(1); }

/* ── Scroll reveal (progressive enhancement) ── */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
}
@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; }
}

/* ── Utility ── */
@media (max-width: 768px) {
    .reveal { opacity: 1; transform: none; }
}