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

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

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

/* Nav link underline animation */
.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--twclr-teal-600, #0d9488);
    border-radius: 1px;
    transition: width 0.2s ease;
}

.nav-link:hover::after {
    width: 60%;
}

/* Service card tilt effect on hover */
.service-card {
    transform: translateY(0);
    will-change: transform;
}

.service-card:hover {
    transform: translateY(-4px);
}

/* Condition item hover */
.condition-item {
    border-radius: 1rem;
}

/* Mobile menu transitions */
#mobileMenu {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#mobileMenu.open {
    transform: translateX(0);
}

#mobileMenu.closed {
    transform: translateX(100%);
}

/* Header shadow on scroll */
#header.scrolled {
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.06);
}

/* Scroll reveal animations (progressive enhancement) */
@media (prefers-reduced-motion: no-preference) {
    .service-card,
    .condition-item,
    .reveal-up {
        opacity: 1;
        transform: translateY(0);
        transition: opacity 0.6s ease, transform 0.6s ease;
    }
}

/* Form focus styles */
input:focus,
select:focus,
textarea:focus {
    outline: none;
}

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

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

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

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