/* ── 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 { display: block; max-width: 100%; }

/* ── Nav transition ───────────────────────────────── */
#nav {
    background: transparent;
    transition: background 0.4s ease, box-shadow 0.4s ease;
}
#nav.scrolled {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}
.nav-logo-text { transition: color 0.4s ease; }

/* ── Nav links ────────────────────────────────────── */
.nav-link { position: relative; }
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: #0d9488;
    transition: width 0.3s ease;
}
.nav-link:hover::after { width: 100%; }

/* ── Mobile menu ──────────────────────────────────── */
#mobile-menu.open { opacity: 1 !important; pointer-events: all !important; }
.mobile-menu-link { transition: color 0.3s ease; }
.mobile-menu-link:hover { color: #0d9488; }
.mobile-menu-link:hover { color: #0d9488; }

/* ── Menu toggle ──────────────────────────────────── */
#menu-toggle { transition: background 0.3s ease; }
.menu-line { transition: transform 0.3s ease, opacity 0.3s ease; }
#menu-toggle.active .menu-line:nth-child(1) { transform: translateY(4px) rotate(45deg); }
#menu-toggle.active .menu-line:nth-child(2) { opacity: 0; }
#menu-toggle.active .menu-line:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }
#menu-toggle.active .menu-line:nth-child(3) { width: 5; }

/* ── Reveal animations (below-fold only) ──────────── */
.reveal {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(24px);
    }
    .reveal.visible {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Hero animations (always visible) ─────────────── */
.reveal-hero {
    opacity: 1;
    transform: translateY(0);
}
.reveal-hero-delay {
    opacity: 1;
}
@media (prefers-reduced-motion: no-preference) {
    .reveal-hero {
        opacity: 0;
        transform: translateY(20px);
        animation: heroReveal 0.9s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    }
    .reveal-hero-delay {
        opacity: 0;
        animation: heroReveal 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.3s forwards;
    }
    @keyframes heroReveal {
        to { opacity: 1; transform: translateY(0); }
    }
}

/* ── Focus styles ─────────────────────────────────── */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
    outline: 2px solid #14b8a6;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ── Selection ────────────────────────────────────── */
::selection { background: rgba(13, 148, 136, 0.15); color: #134e4a; }