/* =============================================================
   intentfirst.ai — Shared Navigation
   =============================================================
   Usage:
     <link rel="stylesheet" href="[basePath]assets/css/nav.css">
     <script src="[basePath]assets/js/nav.js"></script>
     <script>initNav({ basePath: '../', activePage: 'about', lang: 'en' });</script>

   Requires: tokens.css loaded first.
   ============================================================= */

@import url('./site-nav.css');

:root {
  --e-bg: var(--bg, #ffffff);
  --e-bg-2: var(--bg-2, #fafafa);
  --e-bg-card: var(--bg-2, #f4f4f5);
  --e-ink: var(--text, #0a0a0a);
  --e-ink-2: var(--text-2, #525252);
  --e-ink-3: var(--text-3, #a1a1aa);
  --e-line: var(--border-hover, #d4d4d8);
  --e-line-2: var(--border, #e4e4e7);
  --e-green: #30c969;
  --e-green-2: rgba(48, 201, 105, 0.15);
}

[data-theme="dark"] {
  --e-bg: var(--bg, #0a0a0a);
  --e-bg-2: var(--bg-2, #111111);
  --e-bg-card: var(--bg-2, #1a1a1a);
  --e-ink: var(--text, #ededed);
  --e-ink-2: var(--text-2, #a1a1aa);
  --e-ink-3: var(--text-3, #52525b);
  --e-line: var(--border-hover, #3f3f46);
  --e-line-2: var(--border, #27272a);
  --e-green: #30c969;
  --e-green-2: rgba(48, 201, 105, 0.12);
}

/* ─── NAV BAR ─── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.5s var(--ease),
              border-color 0.5s var(--ease),
              box-shadow 0.5s var(--ease),
              transform 0.32s cubic-bezier(0.2, 0, 0, 1);
  will-change: transform;
}

/* Auto-hide state (project scroll pages, scrolling down) */
.nav.nav--hidden {
  transform: translateY(-100%);
}

/* Default state: light solid background */
.nav--solid {
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

/* Transparent state for dark hero pages (via data-dark-nav on body) */
.nav--transparent {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border-bottom: 1px solid transparent;
}

/* When scrolled on a dark-nav page, switch to solid */
.nav--transparent.nav--scrolled {
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

/* ─── NAV INNER ─── */
.nav-inner {
  width: var(--max-w);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0;
}

/* ─── LOGO ─── */
.nav-logo {
  text-decoration: none;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-logo-img {
  height: 28px;
  width: auto;
  transition: opacity 0.3s var(--ease);
}

/* ─── NAV LINKS ─── */
.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.5vw, 28px);
}

.nav-links a,
.nav-dropdown-trigger {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  color: var(--text-2);
  text-decoration: none;
  cursor: pointer;
  transition: color 0.3s var(--ease);
  white-space: nowrap;
}

.nav-links a:hover,
.nav-dropdown-trigger:hover {
  color: var(--color-accent);
}

/* Active page */
.nav-links a.nav-active,
.nav-dropdown-trigger.nav-active {
  color: var(--color-accent);
  font-weight: 500;
}

/* Active underline indicator (desktop nav only) */
.nav-links a.nav-active {
  position: relative;
}
.nav-links a.nav-active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

/* Active indicator on transparent nav (dark hero) */
.nav--transparent .nav-links a.nav-active::after {
  background: rgba(240, 236, 228, 0.7);
}

/* Active indicator after scroll (transparent → solid) */
.nav--transparent.nav--scrolled .nav-links a.nav-active::after {
  background: var(--color-accent);
}

/* Transparent nav: white text (0.75 opacity meets WCAG AA contrast on #08070b) */
.nav--transparent .nav-links a,
.nav--transparent .nav-dropdown-trigger {
  color: rgba(240, 236, 228, 0.75);
}

.nav--transparent .nav-links a:hover,
.nav--transparent .nav-dropdown-trigger:hover {
  color: #f0ece4;
}

.nav--transparent .nav-links a.nav-active,
.nav--transparent .nav-dropdown-trigger.nav-active {
  color: #f0ece4;
}

/* When scrolled, revert to light colors */
.nav--transparent.nav--scrolled .nav-links a,
.nav--transparent.nav--scrolled .nav-dropdown-trigger {
  color: var(--text-2);
}

.nav--transparent.nav--scrolled .nav-links a:hover,
.nav--transparent.nav--scrolled .nav-dropdown-trigger:hover {
  color: var(--color-grammar);
}

.nav--transparent.nav--scrolled .nav-links a.nav-active,
.nav--transparent.nav--scrolled .nav-dropdown-trigger.nav-active {
  color: var(--color-grammar);
}

/* ─── CONTACT LINK (plain, no box) ─── */
.nav-cta {
  font-family: var(--font-sans) !important;
  font-size: 17px !important;
  font-weight: 400 !important;
  letter-spacing: normal;
  text-transform: none;
  padding: 0;
  border: none;
  border-radius: 0;
}

/* ─── DROPDOWN ─── */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  padding: 0;
  line-height: 56px;
}

.nav-dropdown-trigger::after {
  content: '';
  display: inline-block;
  width: 0; height: 0;
  border-left: 3.5px solid transparent;
  border-right: 3.5px solid transparent;
  border-top: 4px solid currentColor;
  opacity: 0.5;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.nav-dropdown.open .nav-dropdown-trigger::after {
  transform: rotate(180deg);
  opacity: 0.8;
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 180px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(26, 24, 22, 0.08),
              0 2px 8px rgba(26, 24, 22, 0.04);
  padding: 6px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(4px);
  transition: opacity 0.2s var(--ease),
              visibility 0.2s var(--ease),
              transform 0.2s var(--ease);
  pointer-events: none;
}

.nav-dropdown.open .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.nav-dropdown-menu a {
  display: block;
  padding: 8px 20px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  color: var(--text-3) !important;
  text-decoration: none;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
  white-space: nowrap;
}

.nav-dropdown-menu a:hover {
  color: var(--color-accent) !important;
  background: rgba(42, 184, 90, 0.06);
}

.nav-dropdown-menu a.nav-active {
  color: var(--color-accent) !important;
  font-weight: 500;
}

/* ─── HAMBURGER ─── */
.hamburger-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  width: 40px;
  height: 40px;
  position: relative;
  flex-shrink: 0;
}

.hamburger-btn span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text);
  position: absolute;
  left: 10px;
  transition: transform 0.3s var(--ease),
              opacity 0.3s var(--ease),
              top 0.3s var(--ease),
              background 0.3s var(--ease);
}

.hamburger-btn span:nth-child(1) { top: 14px; }
.hamburger-btn span:nth-child(2) { top: 20px; }
.hamburger-btn span:nth-child(3) { top: 26px; }

/* Transparent nav hamburger */
.nav--transparent .hamburger-btn span {
  background: #f0ece4;
}

.nav--transparent.nav--scrolled .hamburger-btn span {
  background: var(--text);
}

/* Hamburger open state (X) */
.hamburger-btn.open span:nth-child(1) {
  top: 20px;
  transform: rotate(45deg);
}

.hamburger-btn.open span:nth-child(2) {
  opacity: 0;
}

.hamburger-btn.open span:nth-child(3) {
  top: 20px;
  transform: rotate(-45deg);
}

/* ─── MOBILE OVERLAY ─── */
.nav-mobile-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 999;
  background: color-mix(in srgb, var(--bg) 98%, transparent);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s var(--ease), visibility 0.35s var(--ease);
}

.nav-mobile-overlay.open {
  opacity: 1;
  visibility: visible;
}

.nav-mobile-overlay a {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 400;
  color: var(--text-2);
  text-decoration: none;
  padding: 14px 0;
  transition: color 0.3s var(--ease);
}

.nav-mobile-overlay a:hover {
  color: var(--color-accent);
}

.nav-mobile-overlay a.nav-active {
  color: var(--color-accent);
  font-weight: 500;
}

.nav-mobile-overlay .mobile-section-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-3);
  margin-top: 24px;
  margin-bottom: 4px;
  padding: 0;
}

.nav-mobile-overlay .mobile-sub-link {
  font-size: 16px;
  padding: 10px 0;
  padding-left: 12px;
}

.nav-mobile-overlay .nav-cta {
  margin-top: 4px;
  font-size: 18px;
  font-weight: 400;
  padding: 14px 0;
  border: none;
  border-radius: 0;
  letter-spacing: normal;
  text-transform: none;
  font-family: var(--font-sans);
}

/* ─── MOBILE LANG SWITCHER (bottom of overlay) ─── */
.nav-mobile-lang {
  display: flex;
  gap: 16px;
  margin-top: 32px;
}

.nav-mobile-lang a {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--text-3);
  padding: 6px 12px;
}

.nav-mobile-lang a.active {
  color: var(--text);
}

/* ─── DESKTOP LANGUAGE SWITCHER (left rail) ─── */
.lang-switch {
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-left: none;
  border-radius: 0 10px 10px 0;
  padding: 6px 8px;
  box-shadow: 2px 2px 16px rgba(26, 24, 22, 0.06);
}

.lang-switch a {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 1px;
  text-decoration: none;
  color: var(--text-3);
  padding: 8px 6px;
  transition: color 0.3s var(--ease);
  line-height: 1;
}

.lang-switch a:hover {
  color: var(--color-accent);
}

.lang-switch a.active {
  color: var(--color-accent);
}

.lang-switch .lang-divider {
  width: 12px;
  height: 1px;
  background: var(--border);
}

/* ─── SECONDARY SUBNAV (Context Grammar pages) ─── */
.nav-subnav {
  position: fixed;
  top: 56px;
  left: 0; right: 0;
  z-index: 900;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(253, 252, 250, 0.96);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--border);
}

.nav-subnav-inner {
  width: var(--max-w);
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 24px);
  padding: 0;
}

.nav-subnav-prefix {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-subnav-sep {
  display: block;
  width: 1px;
  height: 14px;
  background: var(--border);
  flex-shrink: 0;
}

.nav-subnav-divider {
  display: block;
  width: 1px;
  height: 14px;
  background: var(--border);
  flex-shrink: 0;
  margin: 0 4px;
  opacity: 0.5;
}

.nav-subnav a {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 400;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  padding: 10px 6px 9px;
  border-bottom: 1.5px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
  line-height: 1;
}

.nav-subnav a:hover {
  color: var(--color-accent);
}

.nav-subnav a.nav-subnav-active {
  color: var(--color-accent);
  font-weight: 600;
  border-bottom-color: var(--color-accent);
  border-bottom-width: 2px;
}

/* Child link nested under a parent (e.g. Specs under Rule Engine) */
.nav-subnav a.nav-subnav-child {
  font-size: 0.92em;
  opacity: 0.7;
}
.nav-subnav a.nav-subnav-child:hover,
.nav-subnav a.nav-subnav-child.nav-subnav-active { opacity: 1; }

.nav-dropdown-menu a.nav-dropdown-child {
  padding-left: 28px;
  font-size: 0.92em;
  opacity: 0.78;
}
.nav-dropdown-menu a.nav-dropdown-child:hover,
.nav-dropdown-menu a.nav-dropdown-child.nav-active { opacity: 1; }

.nav-mobile-overlay a.mobile-sub-link--child {
  padding-left: 32px;
  font-size: 0.92em;
  opacity: 0.78;
}

/* Body with subnav: no extra push needed — CG pages use full-height heroes */

/* ─── RESPONSIVE ─── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hamburger-btn {
    display: block;
  }

  .lang-switch {
    display: none;
  }

  .nav-dropdown-menu {
    display: none;
  }

  /* Subnav: horizontally scrollable pill strip on mobile
     (retains wayfinding for CG sub-pages instead of hiding entirely) */
  .nav-subnav {
    height: 44px;
  }
  .nav-subnav-inner {
    width: 100%;
    padding: 0 16px;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 14px;
    /* Fade edges to hint at horizontal scroll */
    mask-image: linear-gradient(to right, transparent 0, black 16px, black calc(100% - 16px), transparent 100%);
  }
  .nav-subnav-inner::-webkit-scrollbar { display: none; }
  .nav-subnav-prefix { display: none; }
  .nav-subnav-sep { display: none; }
  .nav-subnav a {
    padding: 13px 8px 12px;
    font-size: 13px;
  }
}

@media (min-width: 769px) {
  .nav-mobile-overlay {
    display: none !important;
  }

  .hamburger-btn {
    display: none !important;
  }
}

/* ═══════════════════════════════════════════════════════════════
   MULTI-PAGE VIEW TRANSITIONS — Context Grammar subnav
   When the user clicks a subnav link, the OLD page slides out and
   the NEW page slides in, in the same direction as the indicator
   animates (left or right). Direction is set on <html> via JS
   before navigation; sessionStorage carries it across the boundary.
   Browsers without @view-transition support fall back to normal nav.
   ═══════════════════════════════════════════════════════════════ */
@view-transition {
  navigation: auto;
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 380ms;
  animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  animation-fill-mode: both;
}

/* Forward — going to a page on the right of current in subnav */
html.cgnav-forward::view-transition-old(root)  { animation-name: cg-slide-out-left;  }
html.cgnav-forward::view-transition-new(root)  { animation-name: cg-slide-in-right;  }

/* Backward — going to a page on the left of current in subnav */
html.cgnav-backward::view-transition-old(root) { animation-name: cg-slide-out-right; }
html.cgnav-backward::view-transition-new(root) { animation-name: cg-slide-in-left;   }

@keyframes cg-slide-out-left  { to   { transform: translateX(-10%); opacity: 0; } }
@keyframes cg-slide-in-right  { from { transform: translateX(10%);  opacity: 0; } }
@keyframes cg-slide-out-right { to   { transform: translateX(10%);  opacity: 0; } }
@keyframes cg-slide-in-left   { from { transform: translateX(-10%); opacity: 0; } }

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation-duration: 0.01ms;
  }
}