/* ═══════════════════════════════════════════════════════════════════
   BLUE OCEAN HUB — TOP NAVIGATION
   STATE A: transparent over hero (data-scrolled="false")
   STATE B: frosted on scroll (data-scrolled="true")
   All colour tokens are sourced from tokens.css — no hex literals here.
   Companion JS: /site/js/site-nav.js — flips data-scrolled only.
   ═══════════════════════════════════════════════════════════════════ */

/* The <header> wrapper is fixed so STATE A can sit over the hero. Pages
   without a hero get an equivalent top-padding spacer (.has-hero opts out). */
header {
    position: fixed !important;
    top: 0;
    inset-inline-start: 0;
    inset-inline-end: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
}

#SiteBody:not(.has-hero) { padding-top: 64px; }
@media (max-width: 1023.98px) {
    #SiteBody:not(.has-hero) { padding-top: 56px; }
}

/* ── Shell ──────────────────────────────────────────────────────── */
.site-nav {
    height: 64px;
    padding: 0 24px;
    background: transparent;
    border-bottom: 1px solid transparent;
    box-shadow: none;
    transition: background-color 240ms ease-out,
                color 240ms ease-out,
                border-color 240ms ease-out,
                box-shadow 240ms ease-out;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}
@media (max-width: 1023.98px) {
    .site-nav { height: 56px; padding: 0 16px; }
}

/* SHRUNK — compact bar once the user scrolls past the top so long
   pages (e.g. article reading) get more vertical room. Triggered by
   site-nav.js via data-shrunk; works independently of data-scrolled. */
.site-nav[data-shrunk="true"] {
    height: 48px;
}
.site-nav[data-shrunk="true"] .site-nav__logo {
    height: 32px;
}
.site-nav[data-shrunk="true"] .nav-item.nav-link {
    padding: 6px 10px !important;
    font-size: 14px;
}
.site-nav[data-shrunk="true"] .site-nav__icon-btn {
    width: 32px;
    height: 32px;
}
.site-nav[data-shrunk="true"] .site-nav__lang-pill {
    padding: 4px 12px;
    font-size: 12px;
}
@media (max-width: 1023.98px) {
    .site-nav[data-shrunk="true"] { height: 44px; }
    .site-nav[data-shrunk="true"] .site-nav__logo { height: 28px; }
}

/* STATE B — frosted */
.site-nav[data-scrolled="true"] {
    background-color: var(--nav-surface);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    border-bottom-color: var(--color-border);
    box-shadow: var(--nav-shadow);
    color: var(--color-text);
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .site-nav[data-scrolled="true"] { background-color: var(--nav-surface-fallback); }
}

/* ── Brand / logo ───────────────────────────────────────────────── */
.site-nav__brand {
    display: inline-flex;
    align-items: center;
    padding: 0;
    margin: 0;
    margin-inline-end: 24px;
    line-height: 0;
}
.site-nav__logo {
    display: block;
    height: 44px;
    width: auto;
}
@media (max-width: 1023.98px) {
    .site-nav__logo { height: 36px; }
}

/* Logo state swap — two SVG variants stacked in the same <a>. The default
   (STATE A: floating over the dark hero) shows the on-dark mark. STATE B
   in light theme swaps to the colour mark; STATE B in dark theme keeps
   the on-dark mark because the frosted nav surface is dark too. */
.site-nav__logo--on-dark  { display: block !important; }
.site-nav__logo--on-light { display: none  !important; }

.site-nav[data-scrolled="true"] .site-nav__logo--on-dark  { display: none  !important; }
.site-nav[data-scrolled="true"] .site-nav__logo--on-light { display: block !important; }

[data-theme="dark"] .site-nav[data-scrolled="true"] .site-nav__logo--on-dark  { display: block !important; }
[data-theme="dark"] .site-nav[data-scrolled="true"] .site-nav__logo--on-light { display: none  !important; }

/* ── Link list ──────────────────────────────────────────────────── */
.site-nav__links {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 2px;
    flex-wrap: wrap;
}
.site-nav .nav-item.nav-link {
    position: relative;
    padding: 8px 12px !important;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0;
    line-height: 1.2;
    color: #FFFFFF;
    text-decoration: none;
    border-radius: 8px;
    transition: background-color 240ms ease-out, color 240ms ease-out;
}
.site-nav[data-scrolled="true"] .nav-item.nav-link { color: var(--color-text); }

/* Hover pill — light token wash in STATE B, deeper transparent wash in A. */
.site-nav[data-scrolled="false"] .nav-item.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.14);
    color: #FFFFFF;
    text-decoration: none;
}
.site-nav[data-scrolled="true"] .nav-item.nav-link:hover {
    background-color: var(--brand-50);
    color: var(--color-text);
    text-decoration: none;
}
[data-theme="dark"] .site-nav[data-scrolled="true"] .nav-item.nav-link:hover {
    background-color: rgba(var(--brand-300-rgb), 0.12);
}

/* Active-link pill underline: 2px × 16px, brand-300, centered, animated in. */
.site-nav .nav-item.nav-link::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 4px;
    width: 16px;
    height: 2px;
    border-radius: 999px;
    background: var(--brand-300);
    transform: translateX(-50%) scaleX(0);
    transform-origin: center;
    transition: transform 180ms ease-out, opacity 180ms ease-out;
    opacity: 0;
}
.site-nav .nav-item.nav-link.currentlink::after,
.site-nav .nav-item.nav-link[aria-current="page"]::after {
    transform: translateX(-50%) scaleX(1);
    opacity: 1;
}
.site-nav .nav-item.nav-link.currentlink,
.site-nav .nav-item.nav-link[aria-current="page"] {
    font-weight: 500 !important;
}

/* ── Community dropdown ─────────────────────────────────────────── */
.site-nav__dropdown {
    position: relative;
    display: inline-flex;
    align-items: center;
}
.site-nav__dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: transparent;
    border: 0;
    cursor: pointer;
    font-family: inherit;
}
.site-nav__dropdown-toggle:focus { outline: none; }
.site-nav__dropdown-caret {
    width: 10px;
    height: 7px;
    flex-shrink: 0;
    transition: transform 220ms ease-out;
}
.site-nav__dropdown[data-open="true"] .site-nav__dropdown-caret,
.site-nav__dropdown:hover .site-nav__dropdown-caret,
.site-nav__dropdown:focus-within .site-nav__dropdown-caret {
    transform: rotate(180deg);
}

.site-nav__dropdown-menu {
    position: absolute;
    top: calc(100% + 6px);
    inset-inline-start: 0;
    min-width: 220px;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    background-color: var(--nav-surface-fallback, #fff);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    box-shadow: var(--nav-shadow);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    opacity: 0;
    transform: translateY(-4px);
    pointer-events: none;
    transition: opacity 180ms ease-out, transform 180ms ease-out;
    z-index: 1001;
}
@supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .site-nav__dropdown-menu { background-color: var(--nav-surface); }
}
.site-nav__dropdown[data-open="true"] .site-nav__dropdown-menu,
.site-nav__dropdown:hover .site-nav__dropdown-menu,
.site-nav__dropdown:focus-within .site-nav__dropdown-menu {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.site-nav__dropdown-item {
    display: block;
    padding: 8px 12px;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.3;
    color: var(--color-text);
    border-radius: 8px;
    text-decoration: none;
    transition: background-color 180ms ease-out, color 180ms ease-out;
}
.site-nav__dropdown-item:hover,
.site-nav__dropdown-item:focus-visible {
    background-color: var(--brand-50);
    color: var(--color-text);
    text-decoration: none;
}
[data-theme="dark"] .site-nav__dropdown-item:hover,
[data-theme="dark"] .site-nav__dropdown-item:focus-visible {
    background-color: rgba(var(--brand-300-rgb), 0.12);
}
.site-nav__dropdown-item.is-current {
    color: var(--brand-500);
    font-weight: 600;
}
[data-theme="dark"] .site-nav__dropdown-item.is-current {
    color: var(--brand-300);
}

/* ── Tools cluster (dark-mode + language) ───────────────────────── */
.site-nav__tools {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-inline-start: auto;
}

.site-nav__icon-btn {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    border: none;
    background: transparent;
    color: inherit;
    cursor: pointer;
    transition: background-color 240ms ease-out, color 240ms ease-out;
    padding: 0;
    line-height: 1;
}
.site-nav[data-scrolled="false"] .site-nav__icon-btn { color: #FFFFFF; }
.site-nav[data-scrolled="true"]  .site-nav__icon-btn { color: var(--color-text); }
.site-nav[data-scrolled="false"] .site-nav__icon-btn:hover { background-color: rgba(255,255,255,0.14); }
.site-nav[data-scrolled="true"]  .site-nav__icon-btn:hover { background-color: var(--brand-50); }
[data-theme="dark"] .site-nav[data-scrolled="true"] .site-nav__icon-btn:hover {
    background-color: rgba(var(--brand-300-rgb), 0.12);
}
.site-nav__icon-btn i { font-size: 15px; }

.site-nav__lang-pill {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid currentColor;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.02em;
    line-height: 1.2;
    text-decoration: none;
    color: inherit;
    background: transparent;
    transition: background-color 240ms ease-out, color 240ms ease-out, border-color 240ms ease-out;
}
.site-nav[data-scrolled="false"] .site-nav__lang-pill {
    color: #FFFFFF;
    border-color: rgba(255,255,255,0.55);
}
.site-nav[data-scrolled="true"] .site-nav__lang-pill {
    color: var(--color-text);
    border-color: var(--color-border);
}
.site-nav[data-scrolled="false"] .site-nav__lang-pill:hover {
    background-color: rgba(255,255,255,0.14);
    border-color: #FFFFFF;
    text-decoration: none;
}
.site-nav[data-scrolled="true"] .site-nav__lang-pill:hover {
    background-color: var(--brand-50);
    border-color: var(--brand-300);
    color: var(--color-text);
    text-decoration: none;
}
[data-theme="dark"] .site-nav[data-scrolled="true"] .site-nav__lang-pill:hover {
    background-color: rgba(var(--brand-300-rgb), 0.12);
}

/* ── Hamburger (mobile) ─────────────────────────────────────────── */
.site-nav__toggler {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 40px;
    height: 40px;
    padding: 0;
    margin-inline-start: auto;
    border: none;
    border-radius: 8px;
    background: transparent;
    cursor: pointer;
    transition: background-color 240ms ease-out;
}
.site-nav__toggler-bar {
    display: block;
    width: 22px;
    height: 2px;
    border-radius: 2px;
    background: currentColor;
    transition: transform 220ms ease-out, opacity 220ms ease-out, background-color 240ms ease-out;
}
.site-nav[data-scrolled="false"] .site-nav__toggler { color: #FFFFFF; }
.site-nav[data-scrolled="true"]  .site-nav__toggler { color: var(--color-text); }
.site-nav[data-scrolled="false"] .site-nav__toggler:hover { background-color: rgba(255,255,255,0.14); }
.site-nav[data-scrolled="true"]  .site-nav__toggler:hover { background-color: var(--brand-50); }
.site-nav__toggler[aria-expanded="true"] .site-nav__toggler-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}
.site-nav__toggler[aria-expanded="true"] .site-nav__toggler-bar:nth-child(2) { opacity: 0; }
.site-nav__toggler[aria-expanded="true"] .site-nav__toggler-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* ── Focus ring — visible-only, brand-300 outline, 2px offset ───── */
.site-nav a:focus-visible,
.site-nav button:focus-visible,
.site-nav__lang-pill:focus-visible {
    outline: 2px solid var(--brand-300);
    outline-offset: 2px;
    border-radius: 8px;
}

/* ── Bootstrap collapse reset — desktop ─────────────────────────── */
.site-nav__panel {
    display: flex;
    flex-grow: 1;
    align-items: center;
    flex-basis: auto;
}

/* ══════════════════════════════════════════════════════════════════
   MOBILE DRAWER (< 768px)
   Slides in from the start side (left in LTR, right in RTL) via
   transform. The collapse panel stays display:flex always so the
   transform can animate — visibility is controlled by translateX.
   ══════════════════════════════════════════════════════════════════ */
@media (max-width: 767.98px) {
    .site-nav__toggler { display: inline-flex; }

    .site-nav__panel {
        position: fixed;
        top: 56px;
        inset-inline-start: 0;
        bottom: 0;
        width: min(85vw, 320px);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 16px;
        background-color: var(--nav-surface);
        backdrop-filter: blur(14px) saturate(140%);
        -webkit-backdrop-filter: blur(14px) saturate(140%);
        border-inline-end: 1px solid var(--color-border);
        box-shadow: var(--nav-shadow);
        transform: translateX(-100%);
        transition: transform 220ms ease-out;
        overflow-y: auto;
    }
    [dir="rtl"] .site-nav__panel {
        transform: translateX(100%);
        border-inline-end: 0;
        border-inline-start: 1px solid var(--color-border);
    }
    @supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
        .site-nav__panel { background-color: var(--nav-surface-fallback); }
    }

    /* site-nav.js toggles .is-open on the panel — bypasses Bootstrap's
       collapse plugin so its height animation can't fight our transform. */
    .site-nav__panel.is-open {
        transform: translateX(0);
    }

    .site-nav__links {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        margin-bottom: 16px;
    }
    .site-nav .nav-item.nav-link {
        color: var(--color-text) !important;
        padding: 12px 12px !important;
        border-radius: 8px;
    }
    .site-nav .nav-item.nav-link::after {
        bottom: 8px;
    }
    .site-nav__tools {
        margin-inline-start: 0;
        padding-top: 12px;
        border-top: 1px solid var(--color-border);
    }
    .site-nav__icon-btn,
    .site-nav__lang-pill {
        color: var(--color-text) !important;
        border-color: var(--color-border);
    }

    /* Dropdown collapses to an inline expandable section inside the drawer. */
    .site-nav__dropdown {
        display: flex;
        flex-direction: column;
        align-items: stretch;
    }
    .site-nav__dropdown-toggle {
        width: 100%;
        justify-content: space-between;
        text-align: start;
    }
    .site-nav__dropdown-menu {
        position: static;
        opacity: 1;
        transform: none;
        pointer-events: auto;
        min-width: 0;
        margin-top: 4px;
        padding: 4px 0 4px 12px;
        border: 0;
        border-inline-start: 2px solid var(--color-border);
        border-radius: 0;
        box-shadow: none;
        background: transparent;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        display: none;
    }
    .site-nav__dropdown[data-open="true"] .site-nav__dropdown-menu {
        display: flex;
    }
    .site-nav__dropdown-item {
        padding: 10px 12px;
    }
}

/* Lock background scroll while the drawer is open. */
body.site-nav-open { overflow: hidden; }

/* ══════════════════════════════════════════════════════════════════
   REDUCED MOTION — kill every transition
   ══════════════════════════════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
    .site-nav,
    .site-nav *,
    .site-nav__logo,
    .site-nav__panel,
    .site-nav .nav-item.nav-link::after,
    .site-nav__toggler-bar {
        transition-duration: 0ms !important;
        animation-duration: 0ms !important;
    }
}

/* ══════════════════════════════════════════════════════════════════
   LEGACY SHIMS — the old nav rules in Layout.css used these class
   names; the markup no longer carries them but we keep the old
   underline/colour rules from overriding the new component.
   ══════════════════════════════════════════════════════════════════ */
.site-nav .nav-item.nav__Login-btn { /* removed; lang pill takes its place */ }