/* ── Base ── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

/* ── Animations ── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(32px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes floatIn {
    from { opacity: 0; transform: translateX(40px); }
    to   { opacity: 1; transform: translateX(0); }
}

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

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

.animate-fade-up {
    animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.animate-float-in {
    animation: floatIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.card-1 { animation: float 4s ease-in-out infinite; }
.card-2 { animation: floatReverse 4.5s ease-in-out infinite; }
.card-3 { animation: float 5s ease-in-out infinite; }

/* ── Navbar ── */
#navbar {
    background: transparent;
    transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
}

#navbar.scrolled {
    background: rgba(6, 17, 36, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 rgba(255,255,255,0.05);
}

.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    width: 0;
    height: 1px;
    background: #8fd3bc;
    transition: width 0.3s ease, left 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
    left: 0;
}

/* ── Mobile Menu ── */
#mobile-menu.open {
    opacity: 1;
    pointer-events: all;
}

#mobile-menu.open .mobile-link {
    animation: fadeUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

#mobile-menu.open .mobile-link:nth-child(1) { animation-delay: 0.05s; }
#mobile-menu.open .mobile-link:nth-child(2) { animation-delay: 0.1s; }
#mobile-menu.open .mobile-link:nth-child(3) { animation-delay: 0.15s; }
#mobile-menu.open .mobile-link:nth-child(4) { animation-delay: 0.2s; }

.menu-line {
    transition: transform 0.3s ease, opacity 0.3s ease;
}

#menu-btn.active .menu-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}
#menu-btn.active .menu-line:nth-child(2) {
    opacity: 0;
}
#menu-btn.active .menu-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
    width: 1.5rem;
}

/* ── Service Cards ── */
.service-card {
    will-change: transform;
    transition: transform 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 0 1px rgba(143,211,188,0.15);
}

.service-card img {
    will-change: transform;
}

/* ── Gallery ── */
.gallery-item {
    cursor: pointer;
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.gallery-item:hover {
    transform: scale(1.02);
    box-shadow: 0 16px 48px rgba(0,0,0,0.5);
}

/* ── Scroll Reveal (progressive enhancement) ── */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(24px);
        transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s 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; }
}

/* ── Select styling ── */
select option {
    background: #0a1f3f;
    color: #e2e5eb;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #061124; }
::-webkit-scrollbar-thumb { background: #252d3a; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #353f50; }

/* ── Selection ── */
::selection {
    background: rgba(95, 191, 158, 0.3);
    color: #f6f7f9;
}