/* ─── Base & Reset ─── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

/* ─── Animations ─── */
@keyframes float {
    0%, 100% { transform: translateY(0) rotate(45deg); }
    50% { transform: translateY(-20px) rotate(45deg); }
}
@keyframes blob {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -50px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

/* ─── Scroll Reveal ─── */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 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; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ─── Navbar ─── */
.nav-link { position: relative; }
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: #0D9488;
    transition: width 0.3s ease;
}
.nav-link:hover::after { width: 100%; }

/* ─── CTA Button ─── */
.cta-btn {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}
.cta-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    transition: left 0.5s ease;
}
.cta-btn:hover::before { left: 100%; }

/* ─── Navbar scroll state ─── */
.navbar-scrolled {
    background: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(20px);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
}
.navbar-scrolled .nav-link { color: #334155; }
.navbar-scrolled .navbar-logo { color: #0f172a; }

/* ─── Mobile Menu ─── */
#mobile-menu { opacity: 0; pointer-events: none; }
#mobile-menu.active { opacity: 1; pointer-events: all; }
.mobile-link { transition: color 0.3s ease, transform 0.3s ease; }
.mobile-link:hover { transform: translateX(8px); }

/* ─── Back to Top ─── */
#back-to-top.active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}

/* ─── 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; }

/* ─── Selection ─── */
::selection { background: #99f6e4; color: #134e4a; }
</style>