/* Lojic Loop — pre-login navigation bar */

.skip-link {
    position: fixed;
    top: -100px;
    left: 1rem;
    z-index: 200;
    padding: .7rem 1.1rem;
    background: var(--purple);
    color: var(--white);
    border-radius: var(--radius);
    transition: top var(--dur-fast) var(--ease);
}

.skip-link:focus {
    top: 1rem;
}

.nav {
    position: fixed;
    inset: 0 0 auto;
    z-index: 100;
    background: var(--ground-86);
    backdrop-filter: saturate(180%) blur(18px);
    -webkit-backdrop-filter: saturate(180%) blur(18px);
    border-bottom: 1px solid transparent;
    transition:
        background var(--dur-fast) var(--ease-soft),
        border-color var(--dur-fast) var(--ease-soft);
}

/* Near-opaque once scrolled: at .72 the backdrop-filter samples the black
   Industry section underneath and the bar reads as muddy grey. */
.nav.is-stuck {
    background: var(--ground-95);
    border-bottom-color: var(--ink-08);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    width: 100%;
    max-width: var(--measure);
    margin-inline: auto;
    padding: 1.1rem var(--gutter);
    transition: padding var(--dur-fast) var(--ease-soft);
}

.nav.is-stuck .nav-inner {
    padding-block: .78rem;
}

/* Brand ------------------------------------------------------------------- */

.nav-brand {
    position: relative;
    z-index: 2; /* stays above the mobile drawer panel */
    display: inline-flex;
    align-items: center;
    gap: .68rem;
    flex-shrink: 0;
}

.nav-mark {
    width: 34px;
    height: 34px;
    border-radius: 9px;
    transition: transform .5s var(--ease);
}

.nav-brand:hover .nav-mark {
    transform: rotate(-8deg) scale(1.06);
}

.nav-word {
    font-size: var(--step-0);
    font-weight: 500;
    letter-spacing: -.025em;
}

/* Links ------------------------------------------------------------------- */

.nav-links {
    display: flex;
    align-items: center;
    gap: clamp(1.1rem, 2.4vw, 2.3rem);
}

.nav-link {
    position: relative;
    isolation: isolate;                   /* keeps the highlight's z-index: -1
                                             behind the word but in front of the
                                             nav's own background */
    font-size: var(--step--1);
    font-weight: 400;
    letter-spacing: .01em;
    color: var(--ink-56);
    padding-block: .3rem;
    transition: color var(--dur-fast) var(--ease-soft);
}

/* The wash behind the current section's word. Deliberately faint: it marks
   position while scrolling, it is not a button. */
.nav-link::before {
    content: "";
    position: absolute;
    inset: -.18rem -.52rem .04rem;
    z-index: -1;
    border-radius: 5px;
    background: var(--purple-12);
    opacity: 0;
    transform: scale(.9);
    transition: opacity .4s var(--ease-soft), transform .45s var(--ease);
}

.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 1px;
    background: var(--purple);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform .45s var(--ease);
}

.nav-link:hover {
    color: var(--ink);
}

/* Current section: purple word over the wash, so it reads differently from a
   hovered one. */
.nav-link.is-active {
    color: var(--purple);
}

.nav-link.is-active::before {
    opacity: 1;
    transform: none;
}

.nav-link:hover::after,
.nav-link.is-active::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* CTA --------------------------------------------------------------------- */

.nav-cta {
    position: relative;
    overflow: hidden;
    padding: .68rem 1.35rem;
    border-radius: 100px;
    background: var(--purple);
    color: var(--white);
    font-size: var(--step--1);
    font-weight: 400;
    letter-spacing: .01em;
    white-space: nowrap;
    transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.nav-cta::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--black);
    transform: translate3d(0, 101%, 0);
    transition: transform .5s var(--ease);
}

.nav-cta span {
    position: relative;
    z-index: 1;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 26px var(--purple-24);
}

.nav-cta:hover::before {
    transform: none;
}

/* Scroll progress --------------------------------------------------------- */

.nav-progress {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--purple);
    transform: scaleX(var(--progress, 0));
    transform-origin: left;
}

/* Burger ------------------------------------------------------------------ */

.nav-burger {
    display: none;
    width: 42px;
    height: 42px;
    margin-right: -8px;
    position: relative;
    z-index: 2; /* stays above the mobile drawer panel */
}

.nav-burger span {
    position: absolute;
    left: 11px;
    width: 20px;
    height: 1.5px;
    background: var(--ink);
    transition: transform .4s var(--ease), opacity .2s linear;
}

.nav-burger span:nth-child(1) {
    top: 18px;
}

.nav-burger span:nth-child(2) {
    top: 24px;
}

.nav-burger[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(3px) rotate(45deg);
}

.nav-burger[aria-expanded="true"] span:nth-child(2) {
    transform: translateY(-3px) rotate(-45deg);
}

/* Mobile ------------------------------------------------------------------ */

@media (max-width: 860px) {
    .nav-burger {
        display: block;
    }

    /* Full-height overlay. A partial-height panel lets the hero's own CTA show
       underneath, which reads as a duplicate button. */
    /* .nav has backdrop-filter, which makes it the containing block for fixed
       descendants — so `inset:0` would resolve against the 76px nav bar, not
       the viewport. Height must be stated explicitly. */
    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        height: 100vh;
        height: 100dvh;
        z-index: 1;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: 6.2rem var(--gutter) 2.6rem;
        background: var(--ground);
        overflow-y: auto;
        overscroll-behavior: contain;
        clip-path: inset(0 0 100% 0);
        transition: clip-path .62s var(--ease);
    }

    .nav-links.is-open {
        clip-path: inset(0 0 0 0);
    }

    .nav-link {
        width: 100%;
        padding-block: 1.05rem;
        border-bottom: 1px solid var(--ink-08);
        font-size: var(--step-1);
        color: var(--ink);
        opacity: 0;
        transform: translateY(12px);
        transition: opacity .5s var(--ease), transform .5s var(--ease);
    }

    .nav-links.is-open .nav-link {
        opacity: 1;
        transform: none;
        transition-delay: calc(60ms * var(--i, 0) + 120ms);
    }

    .nav-link::after {
        display: none;
    }

    .nav-cta {
        margin-top: 1.6rem;
        width: 100%;
        text-align: center;
        padding-block: .95rem;
        opacity: 0;
        transform: translateY(12px);
        transition: opacity .5s var(--ease), transform .5s var(--ease);
    }

    .nav-links.is-open .nav-cta {
        opacity: 1;
        transform: none;
        transition-delay: .38s;
    }
}

/* The wash still appears under reduced motion, it just does not travel: the
   fade carries the information, the scale was only polish. */
@media (prefers-reduced-motion: reduce) {

    .nav-link::before {
        transition: opacity .01ms;
        transform: none;
    }

    .nav-link::after {
        transition: none;
    }
}