/* ── Base & Utilities ── */
html {
    scroll-behavior: smooth;
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Animations ── */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

@keyframes floatDelay {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

.fade-in-up {
    animation: fadeInUp 0.7s ease forwards;
}

.fade-in-up-delay {
    animation: fadeInUp 0.7s ease 0.15s forwards;
    opacity: 0;
}

.fade-in-up-delay-2 {
    animation: fadeInUp 0.7s ease 0.3s forwards;
    opacity: 0;
}

.fade-in-up-delay-3 {
    animation: fadeInUp 0.7s ease 0.45s forwards;
    opacity: 0;
}

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

.animate-float-delay {
    animation: floatDelay 3.5s ease-in-out 0.5s infinite;
}

/* ── Scroll Reveal ── */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ── Navbar ── */
#navbar {
    transition: background-color 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
}

#navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 20px rgba(10, 37, 64, 0.06);
}

/* ── Mobile menu animation ── */
#mobile-menu.open .menu-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

#mobile-menu.open .menu-line:nth-child(2) {
    opacity: 0;
}

#mobile-menu.open .menu-line:nth-child(3) {
    width: 1.4rem;
    transform: rotate(-45deg) translate(4px, -4px);
}

/* ── Mobile link hover ── */
.mobile-link {
    position: relative;
}

.mobile-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: #7dd3ac;
    transition: width 0.3s ease;
}

.mobile-link:hover::after {
    width: 100%;
}

/* ── Selection ── */
::selection {
    background: #a9e9c8;
    color: #0a2540;
}

/* ── Focus visible ── */
:focus-visible {
    outline: 2px solid #7dd3ac;
    outline-offset: 2px;
}

/* ── Smooth image loading ── */
img {
    display: block;
    max-width: 100%;
}