/* ---------------------------------------------------------
   ARAVEIL SITE NAVIGATION
   Shared by every page. Markup is rendered by nav.js from a
   single menu definition, so the header stays identical across
   the homepage, sub-pages, legal pages and newsroom articles.
   Type, rules and buttons come from system.css; colour from
   the host page's palette tokens.

   1. NAV TOKENS
   2. HEADER BAR
   3. TOP-LEVEL TRIGGERS
   4. ACTIONS (theme, log in, start, burger)
   5. MEGA PANEL
   6. FEATURED CARD
   7. SCRIM
   8. MOBILE SHEET
   9. RESPONSIVE
   10. REDUCED MOTION
   --------------------------------------------------------- */

/* ---------------------------------------------------------
   1. NAV TOKENS
   --------------------------------------------------------- */
:root {
    --nav-height: 64px;
    --nav-width: 1200px;
    --nav-scrim: rgba(26, 25, 24, 0.28);
    --nav-feature-bg: #1A1918;
    --nav-feature-line: rgba(247, 245, 242, 0.38);
    --nav-feature-dot: rgba(247, 245, 242, 0.14);
}

[data-theme="dark"] {
    --nav-scrim: rgba(0, 0, 0, 0.55);
    --nav-feature-bg: #111113;
    --nav-feature-line: rgba(244, 244, 245, 0.34);
    --nav-feature-dot: rgba(244, 244, 245, 0.12);
}

/* ---------------------------------------------------------
   2. HEADER BAR
   --------------------------------------------------------- */
.site-header {
    position: sticky; top: 0; z-index: 1000;
    min-height: var(--nav-height);
    background: var(--bg-body);
    border-bottom: 1px solid var(--ds-line);
    transition: background 0.2s ease;
}
.site-header.is-open { background: var(--bg-surface); }

.nav-inner {
    width: 90%; max-width: var(--nav-width); height: var(--nav-height); margin: 0 auto;
    display: flex; align-items: center; gap: 2.75rem;
}

.nav-logo { display: inline-flex; align-items: center; flex-shrink: 0; }
.nav-logo-img { height: 24px; width: auto; display: block; }
.nav-logo-img.dark, [data-theme="dark"] .nav-logo-img.light { display: none; }
[data-theme="dark"] .nav-logo-img.dark { display: block; }

/* ---------------------------------------------------------
   3. TOP-LEVEL TRIGGERS
   Mono, tracked and uppercase. The open item is marked by an
   amber rule sitting on the header's bottom edge.
   --------------------------------------------------------- */
.nav-menu { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; height: 100%; }
.nav-item { display: flex; align-items: center; height: 100%; }

.nav-trigger {
    position: relative; z-index: 1; display: inline-flex; align-items: center; gap: 0.55rem;
    height: 100%; padding: 0 0.95rem; border: 0; background: transparent;
    font: 500 0.72rem/1 var(--ds-font-mono); letter-spacing: 0.13em; text-transform: uppercase;
    color: var(--text-muted); cursor: pointer; text-decoration: none;
    transition: color 0.15s ease;
}
.nav-trigger::after {
    content: ""; position: absolute; left: 0.95rem; right: 0.95rem; bottom: -1px; height: 2px;
    background: var(--primary); transform: scaleX(0); transform-origin: left;
    transition: transform 0.25s var(--ds-ease);
}
.nav-trigger:hover,
.nav-trigger[aria-expanded="true"],
.nav-item.is-current > .nav-trigger { color: var(--text-main); }
.nav-trigger[aria-expanded="true"]::after,
.nav-trigger[aria-current="page"]::after { transform: scaleX(1); }

/* Plus that turns into a cross: open and closed read at a glance. */
.nav-toggle-icon { position: relative; width: 9px; height: 9px; flex-shrink: 0; transition: transform 0.25s var(--ds-ease); }
.nav-toggle-icon::before,
.nav-toggle-icon::after { content: ""; position: absolute; background: currentColor; }
.nav-toggle-icon::before { left: 0; right: 0; top: 4px; height: 1px; }
.nav-toggle-icon::after { top: 0; bottom: 0; left: 4px; width: 1px; }
[aria-expanded="true"] > .nav-toggle-icon { transform: rotate(45deg); }

/* ---------------------------------------------------------
   4. ACTIONS (theme, log in, start, burger)
   --------------------------------------------------------- */
.nav-actions { display: flex; align-items: center; gap: 1.1rem; margin-left: auto; }

.theme-toggle {
    width: 34px; height: 34px; border-radius: var(--ds-radius);
    border: 1px solid var(--ds-line-strong); background: transparent; color: var(--text-muted);
    display: inline-flex; align-items: center; justify-content: center; cursor: pointer;
    transition: color 0.15s ease, border-color 0.15s ease;
}
.theme-toggle svg { width: 16px; height: 16px; }
.theme-toggle:hover { color: var(--text-main); border-color: var(--text-main); }

.nav-login {
    font: 500 0.72rem/1 var(--ds-font-mono); letter-spacing: 0.13em; text-transform: uppercase;
    color: var(--text-main); text-decoration: underline; text-decoration-color: var(--ds-line-strong);
    text-underline-offset: 6px; transition: text-decoration-color 0.15s ease;
}
.nav-login:hover { text-decoration-color: var(--primary); }

.nav-start { min-height: 38px; padding: 0 1rem; }

.nav-burger {
    display: none; width: 40px; height: 40px; margin-right: -8px;
    border: 0; background: transparent; color: var(--text-main); cursor: pointer;
    align-items: center; justify-content: center;
}
.nav-burger-lines { position: relative; width: 22px; height: 10px; }
.nav-burger-lines::before,
.nav-burger-lines::after {
    content: ""; position: absolute; left: 0; height: 1.5px; background: currentColor;
    transition: transform 0.25s var(--ds-ease), top 0.25s var(--ds-ease), width 0.25s var(--ds-ease);
}
.nav-burger-lines::before { top: 0; width: 100%; }
.nav-burger-lines::after { top: 8px; width: 64%; }
.nav-burger[aria-expanded="true"] .nav-burger-lines::before { top: 4px; transform: rotate(45deg); }
.nav-burger[aria-expanded="true"] .nav-burger-lines::after { top: 4px; width: 100%; transform: rotate(-45deg); }

/* ---------------------------------------------------------
   5. MEGA PANEL
   Positioned against .site-header (the nearest positioned
   ancestor) so it spans the full viewport width while its
   DOM stays next to its trigger for natural tab order.
   --------------------------------------------------------- */
.nav-panel {
    position: absolute; left: 0; right: 0; top: 100%;
    background: var(--bg-surface);
    border-top: 1px solid var(--ds-line);
    border-bottom: 1px solid var(--ds-line);
}
.nav-panel[hidden] { display: none; }
.site-header:not(.is-switching) .nav-panel { animation: nav-panel-in 0.22s var(--ds-ease); }

@keyframes nav-panel-in {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: none; }
}

.nav-panel-inner {
    width: 90%; max-width: var(--nav-width); margin: 0 auto;
    display: grid; grid-template-columns: repeat(var(--nav-columns, 2), minmax(0, 1fr)) minmax(280px, 1.05fr);
    border-left: 1px solid var(--ds-line);
    counter-reset: nav-column;
}

.nav-column { display: flex; flex-direction: column; border-right: 1px solid var(--ds-line); min-width: 0; }

.nav-column-head {
    position: relative; display: block; padding: 1.4rem 3rem 1.35rem 1.5rem;
    border-bottom: 1px solid var(--ds-line); text-decoration: none; color: inherit;
    transition: background 0.15s ease;
}
.nav-column-head::before {
    counter-increment: nav-column; content: counter(nav-column, decimal-leading-zero);
    display: block; margin-bottom: 0.9rem;
    font: 500 var(--ds-label-size)/1 var(--ds-font-mono); letter-spacing: var(--ds-label-track); color: var(--primary);
}
.nav-column-head:hover { background: var(--ds-hover); }
.nav-column-title {
    display: block; font: 500 1.35rem/1.1 var(--ds-font-display);
    letter-spacing: -0.025em; color: var(--text-main);
}
.nav-column-desc { display: block; margin-top: 0.45rem; font: 400 0.84rem/1.5 var(--ds-font-text); color: var(--text-muted); }

.nav-arrow {
    position: absolute; top: 1.35rem; right: 1.35rem; width: 15px; height: 15px; color: var(--text-muted);
    transition: transform 0.25s var(--ds-ease), color 0.15s ease;
}
.nav-column-head:hover .nav-arrow,
.nav-feature:hover .nav-arrow { transform: translateX(3px); color: var(--primary); }

.nav-links { list-style: none; margin: 0; padding: 1.1rem 1.5rem 1.6rem; display: flex; flex-direction: column; }
.nav-link {
    position: relative; display: inline-flex; align-items: center; gap: 0.45rem; padding: 0.45rem 0;
    font: 400 0.95rem/1.3 var(--ds-font-text); color: var(--text-muted); text-decoration: none;
    transition: color 0.15s ease, transform 0.2s var(--ds-ease);
}
.nav-link::before {
    content: ""; width: 5px; height: 5px; background: var(--primary);
    margin-left: -0.9rem; margin-right: 0.4rem; opacity: 0; transition: opacity 0.15s ease;
}
.nav-link:hover, .nav-link[aria-current="page"] { color: var(--text-main); transform: translateX(0.9rem); }
.nav-link:hover::before, .nav-link[aria-current="page"]::before { opacity: 1; }
.nav-external { width: 10px; height: 10px; opacity: 0.55; }

/* ---------------------------------------------------------
   6. FEATURED CARD
   --------------------------------------------------------- */
.nav-feature {
    position: relative; display: flex; flex-direction: column;
    border-right: 1px solid var(--ds-line); text-decoration: none; color: inherit;
}
.nav-feature-visual {
    display: block; aspect-ratio: 2 / 1; background: var(--nav-feature-bg);
    color: var(--nav-feature-line); overflow: hidden;
}
.nav-feature-visual svg { display: block; width: 100%; height: 100%; }
.nav-feature-visual .accent { fill: var(--primary); }
.nav-feature-visual .accent-stroke { stroke: var(--primary); }
.nav-feature-visual .dot { fill: var(--nav-feature-dot); }

.nav-feature-body { position: relative; padding: 1.15rem 3rem 1.45rem 1.5rem; }
.nav-feature-eyebrow {
    display: block; margin-bottom: 0.7rem;
    font: 500 var(--ds-label-size)/1 var(--ds-font-mono); letter-spacing: var(--ds-label-track);
    text-transform: uppercase; color: var(--text-muted);
}
.nav-feature-eyebrow::before { content: "[ "; }
.nav-feature-eyebrow::after { content: " ]"; }
.nav-feature-title { display: block; font: 500 1.2rem/1.15 var(--ds-font-display); letter-spacing: -0.02em; color: var(--text-main); }
.nav-feature-desc { display: block; margin-top: 0.45rem; font: 400 0.84rem/1.5 var(--ds-font-text); color: var(--text-muted); }
.nav-feature .nav-arrow { top: auto; bottom: 1.55rem; }

/* ---------------------------------------------------------
   7. SCRIM
   --------------------------------------------------------- */
.nav-scrim {
    position: fixed; inset: 0; z-index: 999; background: var(--nav-scrim);
    opacity: 0; pointer-events: none; transition: opacity 0.2s ease;
}
.nav-scrim.is-visible { opacity: 1; pointer-events: auto; }

/* ---------------------------------------------------------
   8. MOBILE SHEET
   An editorial index: numbered display-type entries that open
   in place, with the actions pinned to the foot.
   --------------------------------------------------------- */
.nav-sheet {
    position: fixed; left: 0; right: 0; top: var(--nav-height); bottom: 0; z-index: 1001;
    background: var(--bg-surface); border-top: 1px solid var(--ds-line);
    overflow-y: auto; overscroll-behavior: contain;
    animation: nav-sheet-in 0.28s var(--ds-ease);
}
.nav-sheet[hidden] { display: none; }

@keyframes nav-sheet-in {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: none; }
}

.nav-sheet-inner { width: 90%; margin: 0 auto; padding: 0.5rem 0 2rem; display: flex; flex-direction: column; min-height: 100%; }
.nav-sheet-list { list-style: none; margin: 0; padding: 0; counter-reset: nav-entry; }
.nav-sheet-item { border-bottom: 1px solid var(--ds-line); }

.nav-sheet-toggle,
.nav-sheet-direct {
    width: 100%; display: flex; align-items: baseline; gap: 1rem;
    padding: 1.15rem 0; border: 0; background: transparent; cursor: pointer; text-decoration: none; text-align: left;
    font: 500 1.75rem/1.05 var(--ds-font-display); letter-spacing: -0.03em; color: var(--text-main);
}
.nav-sheet-toggle::before,
.nav-sheet-direct::before {
    counter-increment: nav-entry; content: counter(nav-entry, decimal-leading-zero);
    min-width: 1.6rem; font: 500 var(--ds-label-size)/1 var(--ds-font-mono); letter-spacing: var(--ds-label-track); color: var(--primary);
}
.nav-sheet-toggle .nav-toggle-icon { margin-left: auto; align-self: center; width: 13px; height: 13px; color: var(--text-muted); }
.nav-sheet-toggle .nav-toggle-icon::before { top: 6px; }
.nav-sheet-toggle .nav-toggle-icon::after { left: 6px; }

.nav-sheet-group { padding: 0 0 1.4rem 2.6rem; display: grid; gap: 1.4rem; }
.nav-sheet-group[hidden] { display: none; }
.nav-sheet-heading { display: block; text-decoration: none; color: inherit; }
.nav-sheet-heading .nav-column-title { font-size: 1.05rem; }
.nav-sheet-heading .nav-column-desc { margin-top: 0.2rem; }
.nav-sheet-group .nav-links { padding: 0.4rem 0 0 1rem; margin-top: 0.55rem; border-left: 1px solid var(--ds-line); }
.nav-sheet-group .nav-link:hover, .nav-sheet-group .nav-link[aria-current="page"] { transform: none; }
.nav-sheet-group .nav-link::before { display: none; }

.nav-sheet-actions { display: grid; gap: 0.6rem; margin-top: auto; padding-top: 2.25rem; }
.nav-sheet-actions .ds-btn { min-height: 50px; }

/* ---------------------------------------------------------
   9. RESPONSIVE
   --------------------------------------------------------- */
@media (max-width: 1023px) {
    .nav-menu, .nav-login { display: none; }
    .nav-burger { display: inline-flex; }
    .nav-actions { gap: 0.75rem; }
}
@media (max-width: 520px) {
    :root { --nav-height: 58px; }
    .nav-logo-img { height: 21px; }
    .nav-start { display: none; }
}
@media (min-width: 1024px) {
    .nav-sheet { display: none; }
}

/* ---------------------------------------------------------
   10. REDUCED MOTION
   --------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    .site-header .nav-panel, .nav-sheet { animation: none; }
    .nav-trigger::after, .nav-toggle-icon, .nav-arrow, .nav-link,
    .nav-burger-lines::before, .nav-burger-lines::after, .nav-scrim { transition: none; }
}