/**
 * Premium nav link effect (21st.dev-style)
 * Targets only .site-nav .nav-center a. Include after main stylesheet.
 */

.site-nav .nav-center {
    position: relative;
}

/* Link wrapper for consistent hit area and no layout shift */
.site-nav .nav-center a {
    position: relative;
    padding-bottom: 6px;
    transition: color 280ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Replace default underline with pill highlight that slides in (blue → orange gradient) */
.site-nav .nav-center a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 100%;
    height: 2px;
    max-width: 0;
    background: linear-gradient(90deg, var(--primary-color, #001F3F), var(--accent-color, #FF6F20));
    border-radius: 2px;
    transform: translateX(-50%);
    transition: max-width 280ms cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 280ms cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 0 0 rgba(0, 31, 63, 0);
}

.site-nav .nav-center a:hover::after,
.site-nav .nav-center a:focus::after {
    max-width: 100%;
    box-shadow: 0 0 12px 1px rgba(0, 31, 63, 0.25);
}

.site-nav .nav-center a.nav-active::after,
.site-nav .nav-center a[aria-current="page"]::after {
    max-width: 100%;
    box-shadow: 0 0 12px 1px rgba(0, 31, 63, 0.2);
}

/* Keyboard focus: visible outline, no layout shift */
.site-nav .nav-center a:focus {
    outline: none;
}

.site-nav .nav-center a:focus-visible {
    outline: 2px solid var(--primary-color, #001F3F);
    outline-offset: 4px;
}

.site-nav .nav-center a:focus:not(:focus-visible) {
    outline: none;
}

/* Respect reduced motion: instant or no animation */
@media (prefers-reduced-motion: reduce) {
    .site-nav .nav-center a,
    .site-nav .nav-center a::after {
        transition: none;
    }
    .site-nav .nav-center a:hover::after,
    .site-nav .nav-center a:focus::after,
    .site-nav .nav-center a.nav-active::after,
    .site-nav .nav-center a[aria-current="page"]::after {
        max-width: 100%;
    }
}

/* Dark header variant: subtle glow works on dark bg (if .main-header has dark background) */
.main-header.header-dark .site-nav .nav-center a::after {
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.95), rgba(255, 111, 32, 0.9));
    box-shadow: 0 0 14px 2px rgba(255, 255, 255, 0.15);
}

.main-header.header-dark .site-nav .nav-center a:hover::after,
.main-header.header-dark .site-nav .nav-center a.nav-active::after,
.main-header.header-dark .site-nav .nav-center a[aria-current="page"]::after {
    box-shadow: 0 0 14px 2px rgba(255, 255, 255, 0.25);
}

/* Sliding pill indicator (when JS runs and adds .nav-has-pill) */
.site-nav.nav-has-pill .nav-center a::after {
    display: none;
}

.nav-sliding-pill {
    position: absolute;
    bottom: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color, #001F3F), var(--accent-color, #FF6F20));
    border-radius: 2px;
    pointer-events: none;
    transition: left 280ms cubic-bezier(0.4, 0, 0.2, 1),
                width 280ms cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 12px 1px rgba(0, 31, 63, 0.25);
}

.main-header.header-dark .nav-sliding-pill {
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.95), rgba(255, 111, 32, 0.9));
    box-shadow: 0 0 14px 2px rgba(255, 255, 255, 0.25);
}

@media (prefers-reduced-motion: reduce) {
    .nav-sliding-pill {
        transition: none;
    }
}