/* === Base & Utilities === */
html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Quicksand', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
    font-family: 'Nunito', sans-serif;
}

/* === Scroll Reveal (progressive enhancement) === */
.scroll-reveal {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

@media (prefers-reduced-motion: no-preference) {
    .scroll-reveal {
        opacity: 0;
        transform: translateY(24px);
    }
    
    .scroll-reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
}

/* === Navbar transition === */
.nav-scrolled {
    background: rgba(30, 33, 39, 0.95) !important;
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

/* === Custom scrollbar === */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #f6f6f7;
}
::-webkit-scrollbar-thumb {
    background: #c7c9cd;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #a1a5aa;
}

/* === Selection color === */
::selection {
    background: #ff6b35;
    color: white;
}

/* === Mobile menu animation === */
#mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

#mobile-menu.open {
    max-height: 400px;
}

/* === Focus styles === */
a:focus-visible,
button:focus-visible {
    outline: 2px solid #ff6b35;
    outline-offset: 2px;
    border-radius: 4px;
}

/* === Image lazy-load placeholder === */
img {
    background-color: #f6f6f7;
}