/* ── Base & Utilities ── */
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 80px; }
    body { margin: 0; }
    img, svg { display: block; max-width: 100%; }
    a { text-decoration: none; }
    button { cursor: pointer; border: none; background: none; }

    /* ── Scroll Reveal (progressive enhancement) ── */
    @media (prefers-reduced-motion: no-preference) {
        .reveal {
            opacity: 0;
            transform: translateY(28px);
            transition: opacity 0.7s cubic-bezier(.22,.61,.36,1), transform 0.7s cubic-bezier(.22,.61,.36,1);
        }
        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }
    }

    /* ── Nav mobile menu transition ── */
    #mobileMenu {
        transition: max-height 0.3s ease, opacity 0.3s ease;
    }