/* Shared site navigation — desktop links + mobile drawer */

.site-nav {
    --nav-height: 72px;
    transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.site-nav.is-scrolled {
    background: rgba(255, 255, 255, 0.92) !important;
    box-shadow: 0 1px 0 var(--hair), 0 8px 32px rgba(10, 10, 10, 0.04);
}

.nav-link {
    position: relative;
    transition: color 0.2s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--ink);
    transition: width 0.25s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link.is-active::after {
    width: 100%;
}

/* Hamburger toggle */
.nav-toggle {
    position: relative;
    z-index: 70;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--ink);
    border-radius: 2px;
    background: transparent;
    color: var(--ink);
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.nav-toggle:hover {
    background: var(--ink);
}

.nav-toggle:focus-visible {
    outline: 2px solid var(--ink);
    outline-offset: 3px;
}

.nav-toggle-lines {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 18px;
    pointer-events: none;
}

.nav-toggle-bar {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--ink);
    border-radius: 1px;
    transition:
        transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
        opacity 0.25s ease,
        background 0.2s ease;
    transform-origin: center;
}

.nav-toggle:hover .nav-toggle-bar {
    background: var(--paper);
}

.site-nav.is-open .nav-toggle {
    background: var(--ink);
}

.site-nav.is-open .nav-toggle-bar {
    background: var(--paper);
}

.site-nav.is-open .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.site-nav.is-open .nav-toggle-bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.site-nav.is-open .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu overlay */
.mobile-nav-panel {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 55;
    visibility: hidden;
    pointer-events: none;
}

.site-nav.is-open .mobile-nav-panel {
    visibility: visible;
    pointer-events: auto;
}

.mobile-nav-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(10, 10, 10, 0.4);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    opacity: 0;
    transition: opacity 0.35s ease;
}

.site-nav.is-open .mobile-nav-backdrop {
    opacity: 1;
}

.mobile-nav-drawer {
    position: relative;
    z-index: 1;
    max-height: min(70vh, 420px);
    overflow: auto;
    background: var(--paper);
    border-bottom: 1px solid var(--hair);
    box-shadow: 0 20px 50px rgba(10, 10, 10, 0.12);
    transform: translateY(-110%);
    transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.site-nav.is-open .mobile-nav-drawer {
    transform: translateY(0);
}

.mobile-nav-list {
    list-style: none;
    margin: 0;
    padding: 0.5rem 0 1rem;
}

.mobile-nav-list li {
    margin: 0;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.05rem 0;
    margin: 0 1.5rem;
    border-bottom: 1px solid var(--hair);
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 1.35rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--ink);
    text-decoration: none;
    opacity: 0;
    transform: translateX(-16px);
    transition:
        opacity 0.35s ease,
        transform 0.35s ease,
        color 0.2s ease;
}

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

.mobile-nav-link::after {
    content: '\2192';
    font-size: 1.1rem;
    opacity: 0.35;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.mobile-nav-link:hover,
.mobile-nav-link:focus-visible {
    color: var(--muted);
}

.mobile-nav-link:hover::after,
.mobile-nav-link:focus-visible::after {
    opacity: 1;
    transform: translateX(4px);
}

.site-nav.is-open .mobile-nav-link {
    opacity: 1;
    transform: translateX(0);
}

.site-nav.is-open .mobile-nav-list li:nth-child(1) .mobile-nav-link { transition-delay: 0.06s; }
.site-nav.is-open .mobile-nav-list li:nth-child(2) .mobile-nav-link { transition-delay: 0.1s; }
.site-nav.is-open .mobile-nav-list li:nth-child(3) .mobile-nav-link { transition-delay: 0.14s; }
.site-nav.is-open .mobile-nav-list li:nth-child(4) .mobile-nav-link { transition-delay: 0.18s; }

.mobile-nav-link.is-active {
    color: var(--ink);
}

body.nav-open {
    overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
    .mobile-nav-drawer,
    .mobile-nav-backdrop,
    .mobile-nav-link,
    .nav-toggle-bar {
        transition: none !important;
    }

    .site-nav.is-open .mobile-nav-link {
        opacity: 1;
        transform: none;
    }

    .site-nav.is-open .mobile-nav-drawer {
        transform: translateY(0);
    }
}