/* ─── Reset & Base ─── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; scroll-padding-top: 80px; }
    body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; }
    ul { list-style: none; }

    /* ─── Reduced Motion ─── */
    @media (prefers-reduced-motion: no-preference) {
        .reveal {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
        }
        .reveal.revealed {
            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; }
        .reveal-delay-4 { transition-delay: 0.4s; }
        .reveal-delay-5 { transition-delay: 0.5s; }
        .reveal-delay-6 { transition-delay: 0.6s; }
    }

    /* ─── Always visible when JS disabled ─── */
    .no-js .reveal,
    .js-enabled .reveal.always-visible {
        opacity: 1;
        transform: none;
    }

    /* ─── Header scroll state ─── */
    #site-header {
        background: transparent;
        transition: background 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
    }
    #site-header.scrolled {
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
    }
    #site-header.scrolled .font-serif,
    #site-header.scrolled .text-teal-900 { color: #042f2e; }
    #site-header.scrolled .text-teal-700 { color: #0d9488; }

    /* ─── Mobile menu ─── */
    #mobile-menu.open {
        opacity: 1;
        visibility: visible;
    }
    #mobile-menu.open .mobile-link {
        animation: slideIn 0.3s ease forwards;
        opacity: 0;
    }
    #mobile-menu.open .mobile-link:nth-child(1) { animation-delay: 0.05s; }
    #mobile-menu.open .mobile-link:nth-child(2) { animation-delay: 0.1s; }
    #mobile-menu.open .mobile-link:nth-child(3) { animation-delay: 0.15s; }
    #mobile-menu.open .mobile-link:nth-child(4) { animation-delay: 0.2s; }
    #mobile-menu.open .mobile-link:nth-child(5) { animation-delay: 0.25s; }

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

    /* Hamburger animation */
    #menu-toggle[aria-expanded="true"] .menu-line:nth-child(1) {
        transform: translateY(4px) rotate(45deg);
    }
    #menu-toggle[aria-expanded="true"] .menu-line:nth-child(2) {
        opacity: 0;
        transform: scaleX(0);
    }
    #menu-toggle[aria-expanded="true"] .menu-line:nth-child(3) {
        transform: translateY(-4px) rotate(-45deg);
        width: 1.25rem;
    }

    /* ─── Focus styles ─── */
    a:focus-visible, button:focus-visible {
        outline: 2px solid #0d9488;
        outline-offset: 2px;
        border-radius: 4px;
    }

    /* ─── Selection ─── */
    ::selection {
        background: #ccfbf1;
        color: #042f2e;
    }

    /* ─── Scrollbar ─── */
    ::-webkit-scrollbar { width: 8px; }
    ::-webkit-scrollbar-track { background: #f5f5f4; }
    ::-webkit-scrollbar-thumb { background: #94a3b8; border-radius: 4px; }
    ::-webkit-scrollbar-thumb:hover { background: #64748b; }