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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    overflow-x: hidden;
}

/* Navbar scroll state */
nav[data-scrolled="true"] {
    background: rgba(2, 6, 23, 0.92);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

nav[data-scrolled="false"] .nav-link,
nav[data-scrolled="false"] .nav-text {
    color: rgba(255, 255, 255, 0.9);
}

nav[data-scrolled="true"] .nav-link,
nav[data-scrolled="true"] .nav-text {
    color: rgba(255, 255, 255, 0.85);
}

/* Menu tabs */
.menu-tab {
    background: transparent;
    color: #64748b;
    border: none;
    cursor: pointer;
}

.menu-tab.active {
    background: white;
    color: #0d9488;
    box-shadow: 0 2px 8px rgba(13, 148, 136, 0.15);
}

.menu-tab:hover:not(.active) {
    background: rgba(255, 255, 255, 0.5);
    color: #0d9488;
}

/* Mobile menu */
#mobile-menu {
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mobile-link {
    display: block;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mobile-link:last-child {
    border-bottom: none;
}

/* Scroll reveal animations (progressive enhancement) */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.8s ease, transform 0.8s ease;
    }

    .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; }
}

/* Image hover effects */
.rounded-2xl.overflow-hidden {
    will-change: transform;
}

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

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #94a3b8;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}

/* Focus styles */
a:focus-visible,
button:focus-visible {
    outline: 2px solid #14b8a6;
    outline-offset: 2px;
    border-radius: 4px;
}

/* Selection color */
::selection {
    background: rgba(20, 184, 166, 0.2);
    color: #134e4a;
}