*, *::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;
}

/* Scroll reveal — progressive enhancement via JS */
.scroll-reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Navbar */
#navbar {
    background: transparent;
}

#navbar.scrolled {
    background: rgba(2, 6, 23, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 rgba(255,255,255,0.06);
}

/* Mobile menu */
#mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}

#mobile-menu.open {
    max-height: 500px;
}

.mobile-nav-link {
    display: block;
    padding: 0.5rem 0;
}

/* Selection */
::selection {
    background: rgba(13, 148, 136, 0.2);
    color: #0f766e;
}

/* Focus */
a:focus-visible, button:focus-visible {
    outline: 2px solid #2dd4bf;
    outline-offset: 2px;
    border-radius: 4px;
}

/* Image loading */
img {
    image-rendering: auto;
}

/* Smooth transitions for all interactive elements */
button, a {
    transition: all 0.2s ease;
}