/* ─── Base & Utilities ─── */
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 80px; }
    body { overflow-x: hidden; }

    /* ─── Animations ─── */
    @keyframes float {
        0%, 100% { transform: translateY(0px) rotate(0deg); }
        50% { transform: translateY(-20px) rotate(2deg); }
    }
    @keyframes float-delay {
        0%, 100% { transform: translateY(0px) rotate(0deg); }
        50% { transform: translateY(-15px) rotate(-2deg); }
    }
    @keyframes float-slow {
        0%, 100% { transform: translateY(0px) scale(1); }
        50% { transform: translateY(-10px) scale(1.05); }
    }
    .animate-float { animation: float 6s ease-in-out infinite; }
    .animate-float-delay { animation: float-delay 8s ease-in-out infinite; }
    .animate-float-slow { animation: float-slow 10s ease-in-out infinite; }

    /* ─── Fade-in animations ─── */
    .fade-in {
        opacity: 0;
        transform: translateY(24px);
        animation: fadeInUp 0.8s ease forwards;
    }
    .fade-in:nth-child(2) { animation-delay: 0.15s; }
    .fade-in:nth-child(3) { animation-delay: 0.3s; }
    .fade-in:nth-child(4) { animation-delay: 0.45s; }
    .fade-in:nth-child(5) { animation-delay: 0.6s; }

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

    /* ─── Scroll reveal ─── */
    .scroll-reveal {
        opacity: 0;
        transform: translateY(32px);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .scroll-reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    .scroll-reveal:nth-child(2) { transition-delay: 0.1s; }
    .scroll-reveal:nth-child(3) { transition-delay: 0.2s; }
    .scroll-reveal:nth-child(4) { transition-delay: 0.3s; }
    .scroll-reveal:nth-child(5) { transition-delay: 0.4s; }
    .scroll-reveal:nth-child(6) { transition-delay: 0.5s; }

    /* ─── 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);
        box-shadow: 0 1px 24px rgba(10, 37, 64, 0.06);
    }

    /* ─── Mobile menu ─── */
    #mobile-menu {
        animation: slideDown 0.3s ease;
    }
    @keyframes slideDown {
        from { opacity: 0; transform: translateY(-8px); }
        to { opacity: 1; transform: translateY(0); }
    }

    /* ─── Custom scrollbar ─── */
    ::-webkit-scrollbar { width: 8px; }
    ::-webkit-scrollbar-track { background: #F0F4F8; }
    ::-webkit-scrollbar-thumb { background: #A8BBC8; border-radius: 4px; }
    ::-webkit-scrollbar-thumb:hover { background: #7E99AA; }

    /* ─── Selection ─── */
    ::selection { background: #D8FAF0; color: #0A2540; }