/* ── Base & Reset ────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }

/* ── Navbar scroll state ─────────────────────────────── */
#navbar { 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 20px rgba(10,35,66,0.08);
}

/* ── Nav links underline effect ──────────────────────── */
.nav-link { position: relative; }
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: #34D4A8;
    border-radius: 1px;
    transition: width 0.3s ease;
}
.nav-link:hover::after { width: 100%; }

/* ── Card hover effect ───────────────────────────────── */
.card-hover { will-change: transform; }
.card-hover .group:hover img { transform: scale(1.05); }

/* ── Reveal animations (progressive enhancement) ─────── */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(32px);
        transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    }
    .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    .reveal:nth-child(2) { transition-delay: 0.1s; }
    .reveal:nth-child(3) { transition-delay: 0.2s; }
}

/* ── Mobile menu transition ──────────────────────────── */
#mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.22, 1, 0.36, 1), padding 0.4s ease;
}
#mobile-menu.open {
    max-height: 400px;
}

/* ── Button focus styles ─────────────────────────────── */
a:focus-visible, button:focus-visible {
    outline: 3px solid #34D4A8;
    outline-offset: 2px;
    border-radius: 8px;
}

/* ── Selection color ─────────────────────────────────── */
::selection { background: rgba(52, 212, 168, 0.3); }