/* ── Base ── */
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 80px; }
    body { margin: 0; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
    img { display: block; max-width: 100%; }

    /* ── Navbar ── */
    #navbar {
        background: transparent;
        transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
    }
    #navbar.scrolled {
        background: rgba(255,255,255,0.92);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        box-shadow: 0 1px 0 rgba(0,0,0,0.06), 0 4px 24px rgba(0,0,0,0.04);
    }
    #navbar.scrolled .nav-logo { color: #0f172a; }
    #navbar.scrolled .mobile-link { color: #0f172a; }
    #navbar.scrolled .mobile-link:hover { color: #0D9488; }

    /* ── Mobile menu ── */
    #mobile-menu {
        transition: transform 0.4s cubic-bezier(0.32, 0.72, 0, 1);
    }
    #mobile-menu.open {
        transform: translateX(0);
    }
    #mobile-menu.closed {
        transform: translateX(100%);
    }
    .mobile-link {
        transition: color 0.2s ease;
    }

    /* ── Fade-in on scroll ── */
    .reveal {
        opacity: 0;
        transform: translateY(32px);
        transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .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; }

    /* ── Selection ── */
    ::selection {
        background: #0D9488;
        color: white;
    }