*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    margin: 0;
    min-height: 100vh;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #0d9488;
    color: white;
    padding: 8px 16px;
    z-index: 100;
    font-weight: 600;
    transition: top 0.2s;
}

.skip-link:focus {
    top: 0;
}

::selection {
    background: rgba(20, 184, 166, 0.3);
    color: white;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-12px) rotate(1deg); }
}

@keyframes float-delayed {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-8px) rotate(-1deg); }
}

.animate-float {
    animation: float 4s ease-in-out infinite;
}

.animate-float-delayed {
    animation: float-delayed 5s ease-in-out infinite;
}

/* Scroll reveal — progressive enhancement, hidden by default */
.reveal {
    opacity: 1;
    transform: none;
    transition: none;
}

@media (prefers-reduced-motion: no-preference) {
    .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);
    }

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

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

/* Mobile menu transitions */
#mobile-menu {
    transform: translateY(-20px);
}

#mobile-menu.open {
    opacity: 1 !important;
    pointer-events: auto !important;
    transform: translateY(0);
}

#mobile-menu-btn[aria-expanded="true"] #hamburger {
    transform: rotate(45deg) translate(5px, 5px);
}

#mobile-menu-btn[aria-expanded="true"] #hamburger-mid {
    opacity: 0;
    transform: scaleX(0);
}

#mobile-menu-btn[aria-expanded="true"] #hamburger-bot {
    transform: rotate(-45deg) translate(5px, -5px);
}

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

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

::-webkit-scrollbar-thumb {
    background: #1e293b;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #334155;
}