*, *::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;
}

/* Scroll reveal — progressive enhancement, respects reduced motion */
@media (prefers-reduced-motion: no-preference) {
    .scroll-reveal {
        opacity: 0;
        transform: translateY(28px);
        transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    }
    
    .scroll-reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Fallback: always visible if JS disabled or reduced-motion */
@media (prefers-reduced-motion: reduce) {
    .scroll-reveal {
        opacity: 1;
        transform: none;
    }
}

/* Navbar scroll state */
#navbar.scrolled {
    background: rgba(3, 8, 16, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

/* Mobile menu transitions */
#mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

#mobile-menu.open {
    max-height: 400px;
}

/* Hamburger animation */
.menu-line {
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.2s ease;
}

#menu-toggle.active .menu-line:nth-child(1) {
    transform: translateY(4px) rotate(45deg);
}

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

#menu-toggle.active .menu-line:nth-child(3) {
    transform: translateY(-4px) rotate(-45deg);
}

/* Selection color */
::selection {
    background: rgba(52, 211, 153, 0.3);
    color: #ffffff;
}

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

::-webkit-scrollbar-track {
    background: #030810;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* Focus styles */
a:focus-visible,
button:focus-visible {
    outline: 2px solid #34D399;
    outline-offset: 2px;
    border-radius: 4px;
}