/* ── Base & Utilities ── */
html {
    scroll-behavior: smooth;
}

body {
    overflow-x: hidden;
}

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

/* ── Scroll Reveal Animations ── */
.scroll-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);
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

.scroll-reveal.revealed:nth-child(2) { transition-delay: 0.1s; }
.scroll-reveal.revealed:nth-child(3) { transition-delay: 0.2s; }
.scroll-reveal.revealed:nth-child(4) { transition-delay: 0.3s; }
.scroll-reveal.revealed:nth-child(5) { transition-delay: 0.35s; }
.scroll-reveal.revealed:nth-child(6) { transition-delay: 0.4s; }

/* ── Navbar ── */
#navbar {
    background: transparent;
}

#navbar.scrolled {
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

/* ── Mobile Menu ── */
#mobile-menu {
    animation: slideDown 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.mobile-link {
    position: relative;
}

.mobile-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.3);
    transition: width 0.3s ease;
}

.mobile-link:hover::after {
    width: 100%;
}

/* ── Hero Parallax Subtle ── */
#hero {
    will-change: scroll-position;
}

/* ── Button Focus States ── */
a:focus-visible,
button:focus-visible {
    outline: 2px solid #2dd4bf;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ── Image Loading ── */
img {
    image-rendering: auto;
    background: linear-gradient(135deg, #e2e8f0 0%, #f1f5f9 100%);
}

/* ── Custom Scrollbar ── */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #0f172a;
}

::-webkit-scrollbar-thumb {
    background: #14b8a6;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #2dd4bf;
}

/* ── Responsive Adjustments ── */
@media (max-width: 768px) {
    .scroll-reveal {
        transform: translateY(24px);
    }
}