/* ==========================================================
   Project Navigation - Structure
   1) Local Tokens
   2) Main Layout
   3) Links + Icons
   4) Interactive States
   5) Reduced Motion
   6) Responsive
   ========================================================== */

/* ==========================================================
   Local Tokens
   ========================================================== */
:root {
    /* Typography */
    --project-nav-font-size-desktop: 30px;
    --project-nav-home-font-size-desktop: var(--project-nav-font-size-desktop);
    --project-nav-font-size-mobile: 0;
    --project-nav-home-font-size-mobile: 28px;
    --project-nav-font-weight: 300;

    /* Colors */
    --project-nav-color: var(--text-on-light);
    --project-nav-arrow-color: var(--bg-dark);
    --project-nav-focus-color: var(--bg-light);

    /* Opacity states */
    --project-nav-opacity-link: 1;
    --project-nav-opacity-home-icon: 1;
    --project-nav-opacity-disabled: 0.45;
    --project-nav-opacity-hover: 0.6;

    /* Mobile hit targets */
    --project-nav-hit-size-mobile: 56px;
    --project-nav-icon-size-mobile: 28px;
    --project-nav-home-icon-size-mobile: 24px;
    --project-nav-home-min-width-mobile: var(--project-nav-hit-size-mobile);
    --project-nav-home-padding-inline-mobile: 12px;

    /* Vertical rhythm (mobile) */
    --project-nav-mobile-vertical-gap: 50px;
}

/* ==========================================================
   Main Layout
   ========================================================== */
.project-navigation {
    width: 100%;
    margin-top: 100px;
    margin-bottom: 0;
}

.project-navigation-shell {
    width: min(100%, 680px);
    margin: 0 auto;
    padding: 16px 14px;
}

.project-navigation-links {
    display: grid;
    grid-template-columns: auto auto auto;
    justify-content: center;
    align-items: center;
    gap: 110px;
}

/* ==========================================================
   Links + Icons
   ========================================================== */
.project-navigation-link,
.project-navigation-home {
    color: var(--project-nav-color);
    text-decoration: none;
    transition: opacity 220ms ease, transform 220ms ease;
}

.project-navigation-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: var(--project-nav-font-size-desktop);
    font-weight: var(--project-nav-font-weight);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    opacity: var(--project-nav-opacity-link);
}

.project-navigation-link .project-navigation-icon {
    width: 22px;
    height: 22px;
    color: var(--project-nav-arrow-color);
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 14px;
    transition: transform 280ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.project-navigation-link-label {
    display: inline-block;
    transition: transform 280ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.project-navigation-prev {
    justify-self: center;
}

.project-navigation-next {
    justify-self: center;
}

.project-navigation-home {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: 8px;
    position: relative;
}

.project-navigation-home .project-navigation-home-label {
    font-size: var(--project-nav-home-font-size-desktop);
    font-weight: var(--project-nav-font-weight);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--grey);
    opacity: var(--project-nav-opacity-home-icon);
    transition: color 220ms ease, opacity 220ms ease, transform 260ms cubic-bezier(0.2, 1, 0.2, 1);
}

/* ==========================================================
   Interactive States
   ========================================================== */
.project-navigation-link.is-disabled {
    opacity: var(--project-nav-opacity-disabled);
    pointer-events: none;
}

.project-navigation-link:not(.is-disabled):hover,
.project-navigation-link:not(.is-disabled):focus-visible {
    opacity: var(--project-nav-opacity-hover);
}

.project-navigation-home:hover,
.project-navigation-home:focus-visible {
    opacity: 1;
}

.project-navigation-home:hover .project-navigation-home-label,
.project-navigation-home:focus-visible .project-navigation-home-label {
    color: var(--bg-dark);
    transform: scale(1.01);
}

.project-navigation-prev:not(.is-disabled):hover .project-navigation-icon,
.project-navigation-prev:not(.is-disabled):focus-visible .project-navigation-icon {
    transform: translateX(-7px);
}

.project-navigation-prev:not(.is-disabled):hover .project-navigation-link-label,
.project-navigation-prev:not(.is-disabled):focus-visible .project-navigation-link-label {
    transform: translateX(-3px);
}

.project-navigation-next:not(.is-disabled):hover .project-navigation-icon,
.project-navigation-next:not(.is-disabled):focus-visible .project-navigation-icon {
    transform: translateX(7px);
}

.project-navigation-next:not(.is-disabled):hover .project-navigation-link-label,
.project-navigation-next:not(.is-disabled):focus-visible .project-navigation-link-label {
    transform: translateX(3px);
}

.project-navigation-link:focus-visible,
.project-navigation-home:focus-visible {
    outline: 2px solid var(--project-nav-focus-color);
    outline-offset: 4px;
}

/* ==========================================================
   Reduced Motion
   ========================================================== */
@media (prefers-reduced-motion: reduce) {
    .project-navigation-link,
    .project-navigation-home,
    .project-navigation-link .project-navigation-icon,
    .project-navigation-link-label,
    .project-navigation-home .project-navigation-home-label {
        transition: none;
    }
}

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 640px) {

    .project-navigation {
        margin-top: var(--project-nav-mobile-vertical-gap);
        margin-bottom: var(--project-nav-mobile-vertical-gap);
    }

    .project-navigation-shell {
        padding: 12px 8px;
    }

    .project-navigation-links {
        gap: 24px;
    }

    .project-navigation-link {
        font-size: var(--project-nav-font-size-mobile);
        gap: 0;
        width: var(--project-nav-hit-size-mobile);
        height: var(--project-nav-hit-size-mobile);
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .project-navigation-link-label {
        display: none;
    }

    .project-navigation-link .project-navigation-icon {
        width: var(--project-nav-icon-size-mobile);
        height: var(--project-nav-icon-size-mobile);
    }

    .project-navigation-home {
        width: auto;
        min-width: var(--project-nav-home-min-width-mobile);
        height: var(--project-nav-hit-size-mobile);
        padding-inline: var(--project-nav-home-padding-inline-mobile);
    }

    .project-navigation-home .project-navigation-home-label {
        font-size: var(--project-nav-home-font-size-mobile);
        color: var(--text-on-light);
        opacity: 1;
        white-space: nowrap;
    }
}