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

html { scroll-behavior: smooth; }

body {
    min-height: 100vh;
    overflow-x: hidden;
}

/* Header scroll state */
#site-header.scrolled {
    background: rgba(12, 18, 32, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(45, 212, 191, 0.1);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

/* Mobile menu */
#mobile-menu {
    animation: slideDown 0.25s ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.menu-line { transition: all 0.3s ease; }

#menu-btn.active .menu-line:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
}
#menu-btn.active .menu-line:nth-child(2) {
    opacity: 0;
}
#menu-btn.active .menu-line:nth-child(3) {
    width: 1.25rem;
    transform: rotate(-45deg) translate(4px, -4px);
}

/* Marquee */
.marquee-track {
    animation: marquee 30s linear infinite;
}

@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* Reveal animations */
.reveal-up {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

@media (prefers-reduced-motion: no-preference) {
    .reveal-up {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }
}

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

/* Stagger children */
.grid > .reveal-up:nth-child(1) { transition-delay: 0.05s; }
.grid > .reveal-up:nth-child(2) { transition-delay: 0.12s; }
.grid > .reveal-up:nth-child(3) { transition-delay: 0.19s; }
.grid > .reveal-up:nth-child(4) { transition-delay: 0.26s; }

/* Geometric accent shapes */
.geo-diamond {
    position: absolute;
    width: 12px;
    height: 12px;
    background: #2dd4bf;
    transform: rotate(45deg);
    opacity: 0.4;
    pointer-events: none;
}

/* Custom scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #0c1220; }
::-webkit-scrollbar-thumb { background: #1e293b; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #334155; }

/* Selection */
::selection {
    background: rgba(13, 148, 136, 0.4);
    color: #f0fdfa;
}