/* ── Base ── */
html { scroll-behavior: smooth; }
body { overflow-x: hidden; }

::selection { background: #0f766e; color: #f0fdfa; }

/* ── Nav scroll state ── */
#nav.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(0,0,0,0.06), 0 4px 20px rgba(0,0,0,0.06);
}
#nav.scrolled .nav-text { color: #0f172a; }
#nav.scrolled .nav-link { color: #475569; }
#nav.scrolled .menu-line { background: #1e293b; }

/* ── Mobile menu ── */
#mobile-menu.open { opacity: 1 !important; pointer-events: all !important; }
#mobile-menu .mobile-link { transform: translateY(12px); opacity: 0; transition: all 0.3s ease; }
#mobile-menu.open .mobile-link { transform: translateY(0); opacity: 1; }
#mobile-menu.open .mobile-link:nth-child(1) { transition-delay: 0.05s; }
#mobile-menu.open .mobile-link:nth-child(2) { transition-delay: 0.1s; }
#mobile-menu.open .mobile-link:nth-child(3) { transition-delay: 0.15s; }
#mobile-menu.open .mobile-link:nth-child(4) { transition-delay: 0.2s; }

/* ── Hamburger ── */
.menu-open .menu-line:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.menu-open .menu-line:nth-child(2) { opacity: 0; transform: scaleX(0); }
.menu-open .menu-line:nth-child(3) { transform: translateY(-8px) rotate(-45deg); width: 5px; }

/* ── Hero stat cards ── */
.stat-card {
    transform: translateY(0);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}
.stat-card:hover { transform: translateY(-4px) !important; box-shadow: 0 20px 40px rgba(0,0,0,0.2) !important; }
.card-1 { animation: float1 6s ease-in-out infinite; }
.card-2 { animation: float2 7s ease-in-out infinite; }
.card-3 { animation: float3 5.5s ease-in-out infinite; }

@keyframes float1 {
    0%, 100% { transform: translateY(0) translateX(0); }
    50% { transform: translateY(-10px) translateX(4px); }
}
@keyframes float2 {
    0%, 100% { transform: translateY(0) translateX(0); }
    50% { transform: translateY(-8px) translateX(-3px); }
}
@keyframes float3 {
    0%, 100% { transform: translateY(0) translateX(0); }
    50% { transform: translateY(-12px) translateX(2px); }
}

/* ── 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[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
    .reveal[data-reveal] { opacity: 1; transform: none; }
    .stat-card { animation: none; }
    html { scroll-behavior: auto; }
}

/* ── Subtle image parallax on scroll ── */
.hero-img { will-change: transform; }

/* ── Form focus rings ── */
input:focus, textarea:focus {
    outline: none;
}

/* ── Smooth link underline ── */
a { transition: color 0.2s ease; }

/* ── Mobile menu overlay fix ── */
body.menu-active { overflow: hidden; }