/* Base */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

/* Reveal animation — progressive enhancement, respects reduced motion */
@media (prefers-reduced-motion: no-preference) {
    .reveal-item {
        opacity: 1;
        transform: translateY(0);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .reveal-item.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    .reveal-item:not(.revealed) {
        opacity: 0.4;
        transform: translateY(20px);
    }
}

/* Smooth scroll offset for fixed nav */
section[id] {
    scroll-margin-top: 80px;
}

/* Custom scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #f8fafc; }
::-webkit-scrollbar-thumb { background: #94a3b8; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #64748b; }

/* Selection */
::selection { background: #0d9488; color: #fff; }

/* Mobile menu transitions */
#mobile-menu {
    transition: opacity 0.4s ease, visibility 0.4s ease;
}
#mobile-menu.open {
    opacity: 1;
    pointer-events: all;
}
#mobile-menu.closed {
    opacity: 0;
    pointer-events: none;
}

/* Image aspect ratios */
img {
    display: block;
    max-width: 100%;
}

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