/* ── Base ── */
    *, *::before, *::after {
        box-sizing: border-box;
    }

    html {
        scroll-behavior: smooth;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

    body {
        margin: 0;
        overflow-x: hidden;
    }

    ::selection {
        background: rgba(94, 234, 212, 0.2);
        color: #5EEAD4;
    }

    /* ── Hero fade-in (above the fold — always visible by default) ── */
    .fade-in {
        animation: fadeInUp 0.9s cubic-bezier(0.22, 1, 0.36, 1) forwards;
        opacity: 0;
    }

    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(24px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    /* ── Scroll reveal (below the fold — progressive enhancement) ── */
    .reveal {
        opacity: 1;
        transform: translateY(0);
        transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1),
                    transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
    }

    .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }

    /* Hidden state for JS-enabled scroll reveal */
    @media (prefers-reduced-motion: no-preference) {
        .reveal {
            opacity: 0;
            transform: translateY(32px);
        }
        .reveal.revealed {
            opacity: 1;
            transform: translateY(0);
        }
    }

    /* ── Navbar ── */
    #navbar.scrolled {
        background: rgba(5, 10, 20, 0.92);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    /* ── Custom select arrow ── */
    select option {
        background: #050A14;
        color: #fff;
    }

    /* ── Mobile menu transition ── */
    #mobile-menu {
        animation: slideDown 0.3s cubic-bezier(0.22, 1, 0.36, 1) forwards;
    }

    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-8px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    /* ── Focus visible for accessibility ── */
    a:focus-visible,
    button:focus-visible,
    input:focus-visible,
    textarea:focus-visible,
    select:focus-visible {
        outline: 1px solid rgba(94, 234, 212, 0.5);
        outline-offset: 2px;
    }

    /* ── Subtle image hover parallax ── */
    .group img {
        will-change: transform;
    }

    /* ── Print styles ── */
    @media print {
        body {
            background: #fff;
            color: #000;
        }
        .gradient-hero, section {
            background: #fff !important;
            color: #000 !important;
        }
    }