/* ── Reset & Base ── */
*, *::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; }
img, video { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul, ol { padding: 0; margin: 0; list-style: none; }

/* ── Header scroll state ── */
#site-header {
    background: transparent;
    transition: background 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
}
#site-header.scrolled {
    background: rgba(8, 14, 26, 0.85);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    box-shadow: 0 1px 0 rgba(255,255,255,0.05);
}

/* ── Reveal-on-scroll (progressive enhancement) ── */
.reveal {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(24px);
    }
    .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Selection ── */
::selection {
    background: rgba(20, 184, 166, 0.3);
    color: #f0fdfa;
}

/* ── Focus visible ── */
:focus-visible {
    outline: 2px solid #2dd4bf;
    outline-offset: 2px;
}

/* ── Custom scrollbar ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #0f172a; }
::-webkit-scrollbar-thumb { background: #1e293b; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #334155; }

/* ── Mobile menu animation ── */
#mobile-menu {
    animation: slideDown 0.25s ease forwards;
}
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Image hover containers ── */
.aspect-\[4\/3\] { position: relative; }