/* Base & Utilities */
    *, *::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;
    }

    /* Navbar */
    #navbar {
        background: transparent;
        transition: background 0.4s ease, box-shadow 0.4s ease;
    }

    #navbar.scrolled {
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(12px);
        box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
    }

    /* Scroll indicator animation */
    @keyframes scrollDot {
        0% { transform: translateY(-8px); opacity: 0; }
        50% { opacity: 1; }
        100% { transform: translateY(8px); opacity: 0; }
    }

    .animate-scroll-dot {
        animation: scrollDot 1.2s ease-in-out infinite;
    }

    /* Mobile menu transitions */
    #mobile-menu {
        animation: slideDown 0.3s ease-out;
    }

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

    /* Scroll reveal (progressive enhancement) */
    @media (prefers-reduced-motion: no-preference) {
        .reveal {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.7s ease, transform 0.7s ease;
        }

        .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; }
    }

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

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