/* ── Reset & Base ─────────────────────────────────────── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; scroll-padding-top: 80px; }
    body { min-height: 100vh; overflow-x: hidden; }
    img { display: block; max-width: 100%; }

    /* ── Scroll Reveal (progressive enhancement) ──────────── */
    @media (prefers-reduced-motion: no-preference) {
        .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);
        }
        /* Stagger children */
        .reveal-delay-1 { transition-delay: 0.1s; }
        .reveal-delay-2 { transition-delay: 0.2s; }
        .reveal-delay-3 { transition-delay: 0.3s; }
    }
    @media (prefers-reduced-motion: reduce) {
        .reveal { opacity: 1; transform: none; transition: none; }
    }

    /* ── Navbar ───────────────────────────────────────────── */
    #navbar {
        background: transparent;
        transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
    }
    #navbar.scrolled {
        background: rgba(6, 13, 26, 0.85);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        box-shadow: 0 1px 0 rgba(94, 234, 212, 0.06);
    }

    /* ── Mobile Menu ──────────────────────────────────────── */
    #mobile-menu {
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.35s ease;
    }
    #mobile-menu.active {
        opacity: 1;
        pointer-events: auto;
    }
    .mobile-link {
        opacity: 0;
        transform: translateY(16px);
        transition: opacity 0.3s ease, transform 0.3s ease, color 0.3s ease;
    }
    #mobile-menu.active .mobile-link {
        opacity: 1;
        transform: translateY(0);
    }
    #mobile-menu.active .mobile-link:nth-child(1) { transition-delay: 0.1s; }
    #mobile-menu.active .mobile-link:nth-child(2) { transition-delay: 0.15s; }
    #mobile-menu.active .mobile-link:nth-child(3) { transition-delay: 0.2s; }
    #mobile-menu.active .mobile-link:nth-child(4) { transition-delay: 0.25s; }
    #mobile-menu.active .mobile-link:nth-child(5) { transition-delay: 0.3s; }

    /* Hamburger animation */
    .menu-line { transition: transform 0.3s ease, opacity 0.3s ease; }
    #mobile-menu-btn[aria-expanded="true"] .menu-line:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    #mobile-menu-btn[aria-expanded="true"] .menu-line:nth-child(2) {
        opacity: 0;
    }
    #mobile-menu-btn[aria-expanded="true"] .menu-line:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
        width: 1.25rem;
    }

    /* ── Selection ────────────────────────────────────────── */
    ::selection { background: rgba(94, 234, 212, 0.2); color: #f0fdf8; }

    /* ── Custom Scrollbar ─────────────────────────────────── */
    ::-webkit-scrollbar { width: 8px; }
    ::-webkit-scrollbar-track { background: #0a1628; }
    ::-webkit-scrollbar-thumb { background: #1c305e; border-radius: 4px; }
    ::-webkit-scrollbar-thumb:hover { background: #273f78; }

    /* ── Focus styles ─────────────────────────────────────── */
    a:focus-visible, button:focus-visible {
        outline: 2px solid #5eead4;
        outline-offset: 3px;
        border-radius: 4px;
    }

    /* ── Smooth image loading ─────────────────────────────── */
    img { image-rendering: auto; }