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

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

body {
    margin: 0;
    overflow-x: hidden;
}

::selection {
    background: #3ABFB5;
    color: #0B1D3A;
}

img {
    display: block;
    max-width: 100%;
}

/* === SCROLLBAR === */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #0B1D3A;
}
::-webkit-scrollbar-thumb {
    background: #3ABFB5;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #8fd9c8;
}

/* === REVEAL ANIMATIONS (progressive enhancement) === */
@media (prefers-reduced-motion: no-preference) {
    .reveal-up {
        opacity: 1;
        transform: translateY(0);
        transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .reveal-left {
        opacity: 1;
        transform: translateX(0);
        transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .reveal-right {
        opacity: 1;
        transform: translateX(0);
        transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    }
}

/* Hidden state — applied by JS for scroll-triggered reveals */
.reveal-up.hidden,
.reveal-left.hidden,
.reveal-right.hidden {
    opacity: 0;
    transform: translateY(30px);
}
.reveal-left.hidden {
    transform: translateX(-30px);
}
.reveal-right.hidden {
    transform: translateX(30px);
}

/* === NAV === */
#nav {
    background: transparent;
}

#nav.scrolled {
    background: rgba(11, 29, 58, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(58, 191, 181, 0.1);
}

/* === HERO === */
#hero {
    position: relative;
}

/* === GALLERY HOVER === */
.gallery-img {
    transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.gallery-img:hover {
    transform: scale(1.1);
}

/* === LINK UNDERLINE ANIMATION === */
a {
    text-decoration: none;
}

/* === BUTTON FOCUS === */
a:focus-visible,
button:focus-visible {
    outline: 2px solid #3ABFB5;
    outline-offset: 2px;
    border-radius: 4px;
}

/* === MOBILE MENU TRANSITIONS === */
#mobile-menu {
    transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), pointer-events 0s linear 0.4s;
}
#mobile-menu.open {
    opacity: 1;
    pointer-events: all;
    transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), pointer-events 0s;
}

/* === MOBILE LINKS === */
.mobile-link {
    transition: color 0.3s ease, transform 0.3s ease;
}
.mobile-link:hover {
    color: #3ABFB5;
    transform: scale(1.05);
}

/* === SECTION DIVIDER === */
.section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(58, 191, 181, 0.2), transparent);
}