/* ============================================
   4. NAVIGATION
   ============================================ */

nav {
    position:fixed;
    top:0;
    left:0;
    right:0;
    background:var(--white) !important;
    color:var(--black) !important;
    padding:12px 16px;
    display:flex;
    justify-content:space-between;
    align-items:center;
    z-index:10000;
}

[data-theme="dark"] nav {
    background:#1a1a1a !important;
    color:#ffffff !important;
}

.nav-right {
    display:flex;
    align-items:center;
    gap:16px;
}

.nav-right > a {
    color:var(--black);
    text-decoration:none;
    font-family:'IBM Plex Mono',monospace;
    font-size:0.875rem;
    white-space:nowrap;
    cursor:pointer;
}

.nav-right > a:hover {
}

.nav-title {
    font-size:1.1rem;
    font-weight:700;
    white-space:nowrap;
    color:var(--black);
    text-decoration:none;
    display:inline-block;
    cursor:pointer;
}

.nav-title:visited {
    color:var(--black);
}

.nav-title:hover {
}

.nav-left {
    display:flex;
    align-items:center;
    gap:8px;
    z-index:1002;
}

.menu-details {
    margin-left:auto;
}

.menu-toggle {
    display:flex;
    flex-direction:column;
    justify-content:space-between;
    width:44px;
    height:44px;
    padding:10px;
    cursor:pointer;
    z-index:1003;
    text-decoration:none;
    box-sizing:border-box;
}

.nav-close-target {
    position:fixed;
    top:0;
    left:0;
    width:0;
    height:0;
    overflow:hidden;
}

.hamburger-line {
    display:block;
    width:100%;
    height:3px;
    background:var(--black);
    transition:all 0.3s ease;
}

.menu-details:target .menu-toggle .hamburger-line:nth-child(1),
.menu-details.is-open .menu-toggle .hamburger-line:nth-child(1) {
    transform:rotate(45deg) translate(7px,7px);
}

.menu-details:target .menu-toggle .hamburger-line:nth-child(2),
.menu-details.is-open .menu-toggle .hamburger-line:nth-child(2) {
    opacity:0;
}

.menu-details:target .menu-toggle .hamburger-line:nth-child(3),
.menu-details.is-open .menu-toggle .hamburger-line:nth-child(3) {
    transform:rotate(-45deg) translate(7px,-7px);
}

.nav-links {
    position:fixed;
    top:60px;
    left:0;
    right:0;
    background:var(--white) !important;
    color:var(--black) !important;
    border:1px solid #ccc;
    flex-direction:column;
    padding:20px;
    gap:0;
    transform:translateY(-100%);
    opacity:0;
    visibility:hidden;
    z-index:10000;
}

[data-theme="dark"] .nav-links {
    background:#1a1a1a !important;
    color:#ffffff !important;
    border-color:#444;
    visibility:hidden;
    transition:all 0.3s ease;
    border-bottom:none;
    max-height:calc(100vh - 60px);
    overflow-y:auto;
    z-index:999;
}

.menu-details:target .nav-links,
.menu-details.is-open .nav-links {
    transform:translateY(0);
    opacity:1;
    visibility:visible;
}

.js-nav .nav-links {
    transform:translateY(-12px);
    opacity:0;
    visibility:hidden;
    pointer-events:none;
    transition:opacity 0.25s ease,transform 0.25s ease,visibility 0s linear 0.25s;
}

.js-nav body.nav-open .nav-links {
    transform:translateY(0);
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transition:opacity 0.25s ease,transform 0.25s ease;
}

.js-nav body.nav-open {
    overflow:hidden;
}

.js-nav .nav-overlay {
    position:fixed;
    inset:0;
    background:rgba(10,10,10,0.45);
    backdrop-filter:blur(2px);
    opacity:0;
    transition:opacity 0.2s ease;
    z-index:997;
    pointer-events:none;
}

.js-nav .nav-overlay.visible {
    opacity:1;
    pointer-events:auto;
}

.js-nav body.nav-open .nav-links a {
    animation:navLinkFade 0.35s ease both;
}

.js-nav body.nav-open .nav-links a:nth-child(1) { animation-delay:0.03s; }
.js-nav body.nav-open .nav-links a:nth-child(2) { animation-delay:0.06s; }
.js-nav body.nav-open .nav-links a:nth-child(3) { animation-delay:0.09s; }
.js-nav body.nav-open .nav-links a:nth-child(4) { animation-delay:0.12s; }
.js-nav body.nav-open .nav-links a:nth-child(5) { animation-delay:0.15s; }
.js-nav body.nav-open .nav-links a:nth-child(6) { animation-delay:0.18s; }
.js-nav body.nav-open .nav-links a:nth-child(7) { animation-delay:0.21s; }
.js-nav body.nav-open .nav-links a:nth-child(8) { animation-delay:0.24s; }
.js-nav body.nav-open .nav-links a:nth-child(9) { animation-delay:0.27s; }
.js-nav body.nav-open .nav-links a:nth-child(10) { animation-delay:0.3s; }
.js-nav body.nav-open .nav-links a:nth-child(11) { animation-delay:0.33s; }
.js-nav body.nav-open .nav-links a:nth-child(12) { animation-delay:0.36s; }

@keyframes navLinkFade {
    from {
        opacity:0;
        transform:translateY(-6px);
    }
    to {
        opacity:1;
        transform:translateY(0);
    }
}

@media (prefers-reduced-motion:reduce) {
    .js-nav .nav-links,.js-nav body.nav-open .nav-links,.js-nav .nav-overlay,.js-nav body.nav-open .nav-links a {
        transition:none;
        animation:none;
    }
}

.nav-links a {
    padding:16px 0;
    border-bottom:1px solid #eee;
    font-size:1rem;
    color:var(--black) !important;
    text-decoration:none;
    font-family:'IBM Plex Mono',monospace;
    display:block;
}

[data-theme="dark"] .nav-links a {
    color:#ffffff !important;
    border-bottom-color:#444;
}

.nav-links .nav-close {
    text-align:right;
    font-size:0.8rem;
    letter-spacing:0.12em;
    color:var(--charcoal);
    padding:10px 0 18px;
}

.nav-links a:last-child {
    border-bottom:none;
}

.desktop-only {
    display:block;
}

.mobile-only {
    display:none;
}