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

/* ── Nav ── */
#nav {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}
#nav.scrolled {
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.06);
}
.nav-logo-color { color: #0d9488; }
.nav-logo-text { color: #1e293b; }
#nav.scrolled .nav-logo-color { color: #0d9488; }
#nav.scrolled .nav-logo-text { color: #1e293b; }

/* ── Mobile Menu ── */
#mobile-menu.open { transform: translateX(0); }
.mobile-menu-link { transition: color 0.2s; }

/* ── Scroll Reveal ── */
.reveal {
    opacity: 1;
    transform: translateY(0);
    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);
}

/* Default visible state for progressive enhancement */
.reveal {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(30px);
    }
    .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Stagger children ── */
.reveal-grid > * {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-reduced-motion: no-preference) {
    .reveal-grid > * {
        opacity: 0;
        transform: translateY(20px);
    }
    .reveal-grid.revealed > *:nth-child(1) { transition-delay: 0.05s; }
    .reveal-grid.revealed > *:nth-child(2) { transition-delay: 0.1s; }
    .reveal-grid.revealed > *:nth-child(3) { transition-delay: 0.15s; }
    .reveal-grid.revealed > *:nth-child(4) { transition-delay: 0.2s; }
    .reveal-grid.revealed > *:nth-child(5) { transition-delay: 0.25s; }
    .reveal-grid.revealed > *:nth-child(6) { transition-delay: 0.3s; }
    .reveal-grid.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    .reveal-grid.revealed > * {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Selection ── */
::selection { background: #ccfbf1; color: #134e4a; }

/* ── Smooth image loading ── */
img { display: block; max-width: 100%; }