/* ── Base & Utilities ─────────────────────────────────────────── */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ── Scroll Reveal (progressive enhancement) ─────────────────── */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(24px);
        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-delay-1 { transition-delay: 0.1s; }
    .reveal-delay-2 { transition-delay: 0.2s; }
    .reveal-delay-3 { transition-delay: 0.3s; }
}

/* ── Custom Scrollbar ────────────────────────────────────────── */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #f1f5f9;
}
::-webkit-scrollbar-thumb {
    background: #94a3b8;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}

/* ── Floating cards animation ────────────────────────────────── */
@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(var(--rotate, 0deg)); }
    50% { transform: translateY(-12px) rotate(var(--rotate, 0deg)); }
}

.hero-card-float {
    animation: float 6s ease-in-out infinite;
}

.hero-card-float-delay {
    animation: float 6s ease-in-out 2s infinite;
}

.hero-card-float-delay-2 {
    animation: float 7s ease-in-out 1s infinite;
}

/* ── Navbar active state ─────────────────────────────────────── */
.nav-link-active {
    color: #0f766e;
}

/* ── Contact form focus ──────────────────────────────────────── */
input:focus, textarea:focus {
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
}

/* ── Mobile menu transition ──────────────────────────────────── */
#mobile-menu {
    animation: slideDown 0.25s ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Scroll top button ───────────────────────────────────────── */
#scroll-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
</style>