/* ── Base & Typography ── */
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    overflow-x: hidden;
}

::selection {
    background-color: rgba(52, 211, 153, 0.25);
    color: #0F172A;
}

/* ── Scroll Indicator Animation ── */
@keyframes scroll-indicator {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(100%); }
}

.animate-scroll-indicator {
    animation: scroll-indicator 1.5s ease-in-out infinite;
}

/* ── Scroll Reveal (Progressive Enhancement) ── */
@media (prefers-reduced-motion: no-preference) {
    .scroll-reveal {
        opacity: 0;
        transform: translateY(24px);
        transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    }
    
    .scroll-reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    
    /* Staggered delays */
    .scroll-reveal:nth-child(1) { transition-delay: 0.05s; }
    .scroll-reveal:nth-child(2) { transition-delay: 0.1s; }
    .scroll-reveal:nth-child(3) { transition-delay: 0.15s; }
    .scroll-reveal:nth-child(4) { transition-delay: 0.2s; }
    .scroll-reveal:nth-child(5) { transition-delay: 0.25s; }
    .scroll-reveal:nth-child(6) { transition-delay: 0.3s; }
}

/* ── Navbar Glass Effect ── */
#navbar.scrolled {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.06), 0 4px 24px rgba(15, 23, 42, 0.04);
}

/* ── Custom Focus Styles ── */
input:focus, select:focus, textarea:focus {
    outline: none;
}

/* ── Subtle hover lift for cards ── */
@media (prefers-reduced-motion: no-preference) {
    .group:hover {
        transform: translateY(-2px);
    }
}

/* ── Form select arrow ── */
select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

/* ── Smooth image loading ── */
img {
    opacity: 1;
    transition: opacity 0.3s ease;
}

img[data-src] {
    opacity: 0;
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    .scroll-reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
    
    .animate-scroll-indicator {
        animation: none;
    }
    
    .group:hover {
        transform: none;
    }
}