/**
 * nav.css — Novagroup Site Navigation
 * Desktop horizontal nav + mobile hamburger drawer.
 * Sticky behavior, compact-on-scroll state, scroll progress bar.
 * ALL values reference tokens from css/tokens.css.
 */

/* ============================================================
 * SCROLL PROGRESS BAR (top of viewport)
 * ============================================================ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--c-copper);
  z-index: calc(var(--z-sticky) + 1);
  transition: width 0.1s var(--ease-linear);
  transform-origin: left;
}

/* ============================================================
 * HEADER / NAV SHELL
 * Structural rules in layout.css (.site-header, .site-header.is-compact)
 * Visual/color rules here.
 * ============================================================ */
.site-header {
  background-color: transparent;
  color: var(--c-white);
}

/* When page has a light hero or non-dark background, add this class */
.site-header--on-light {
  color: var(--c-navy);
}

.site-header--on-light .nav__link {
  color: var(--c-navy);
}

.site-header--on-light .nav__link:hover {
  color: var(--c-copper);
}

/* Compact state visual overrides */
.site-header.is-compact {
  background-color: var(--c-navy);
  color: var(--c-white);
}

.site-header.is-compact .nav__link {
  color: var(--c-white);
}

/* ============================================================
 * LOGO
 * ============================================================ */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  text-decoration: none;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--c-white);
  flex-shrink: 0;
  transition: opacity var(--dur-micro) var(--ease-out);
}

.nav__logo::after {
  display: none; /* override base.css link underline draw */
}

.nav__logo:hover {
  opacity: 0.85;
}

.nav__logo-wordmark {
  line-height: 1;
}

.nav__logo-accent {
  display: block;
  width: 32px;
  height: 2px;
  background-color: var(--c-copper);
  margin-top: 2px;
}

/* ============================================================
 * DESKTOP NAV LINKS
 * ============================================================ */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  list-style: none;
}

.nav__link {
  font-family: var(--font-sans);
  font-size: var(--fs-nav);
  font-weight: 500;
  color: var(--c-white);
  text-decoration: none;
  position: relative;
  padding-block: var(--sp-2);
  transition: color var(--dur-micro) var(--ease-out);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--c-copper);
  transition: width var(--dur-short) var(--ease-out);
}

.nav__link:hover {
  color: var(--c-copper);
}

.nav__link:hover::after {
  width: 100%;
}

/* Active page indicator */
.nav__link.is-active {
  color: var(--c-copper);
}

.nav__link.is-active::after {
  width: 100%;
}

/* ============================================================
 * NAV RIGHT ACTIONS (lang switcher + CTA)
 * ============================================================ */
.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

/* ============================================================
 * HAMBURGER BUTTON (mobile only)
 * ============================================================ */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--sp-2);
  border-radius: var(--radius-sm);
  transition: background-color var(--dur-micro) var(--ease-out);
}

.nav__hamburger:hover {
  background-color: rgb(255 255 255 / 0.1);
}

.nav__hamburger-bar {
  display: block;
  width: 24px;
  height: 1.5px;
  background-color: var(--c-white);
  border-radius: 2px;
  transform-origin: center;
  transition:
    transform  var(--dur-short) var(--ease-out),
    opacity    var(--dur-short) var(--ease-out);
}

/* Open state — X icon */
.nav__hamburger[aria-expanded="true"] .nav__hamburger-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav__hamburger[aria-expanded="true"] .nav__hamburger-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav__hamburger[aria-expanded="true"] .nav__hamburger-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ============================================================
 * MOBILE DRAWER
 * ============================================================ */
.nav__drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  background-color: var(--c-navy);
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  padding: var(--sp-7) var(--sp-6);
  transform: translateX(100%);
  transition: transform var(--dur-medium) var(--ease-out);
  overflow-y: auto;
}

.nav__drawer.is-open {
  transform: translateX(0);
}

/* Drawer backdrop */
.nav__backdrop {
  position: fixed;
  inset: 0;
  background-color: rgb(6 20 41 / 0.7);
  z-index: calc(var(--z-overlay) - 1);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-medium) var(--ease-out);
  backdrop-filter: blur(4px);
}

.nav__backdrop.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* Drawer nav links */
.nav__drawer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-top: var(--sp-7);
}

.nav__drawer-link {
  font-family: var(--font-serif);
  font-size: var(--fs-h3);
  font-weight: 500;
  color: var(--c-white);
  text-decoration: none;
  padding: var(--sp-3) 0;
  border-bottom: 1px solid rgb(255 255 255 / 0.07);
  display: block;
  transition: color var(--dur-micro) var(--ease-out);
}

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

.nav__drawer-link:hover {
  color: var(--c-copper);
}

.nav__drawer-link.is-active {
  color: var(--c-copper);
}

/* Drawer close button */
.nav__drawer-close {
  position: absolute;
  top: var(--sp-4);
  right: var(--sp-4);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgb(255 255 255 / 0.08);
  border-radius: var(--radius-sm);
  color: var(--c-white);
  font-size: 1.25rem;
  transition: background-color var(--dur-micro) var(--ease-out);
}

.nav__drawer-close:hover {
  background-color: rgb(255 255 255 / 0.15);
}

.nav__drawer-actions {
  margin-top: auto;
  padding-top: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

/* ============================================================
 * MOBILE BREAKPOINT
 * Collapse to the drawer at <=900px (not 767) so the crowded 768-900 tablet
 * band — where the full nav clips the ES switcher — never renders. Matches
 * where the pillars grid also collapses. (#19, id:nav-collapse-too-late-768)
 * ============================================================ */
@media (max-width: 900px) {
  .nav__links,
  .site-nav {
    display: none; /* shown in drawer instead */
  }

  .nav__hamburger,
  .nav-toggle {
    display: flex;
  }

  .nav__actions .btn {
    display: none; /* CTA in drawer */
  }

  .nav__actions .lang-switcher {
    display: flex; /* keep lang switcher in header on mobile */
  }
}

/* ============================================================
 * REDUCED MOTION
 * ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .nav__drawer,
  .nav-drawer,
  .nav__backdrop,
  .nav-backdrop,
  .nav__link::after,
  .site-nav__link::after,
  .nav__hamburger-bar,
  .nav-toggle__bar {
    transition: none;
  }

  .nav__drawer.is-open,
  .nav-drawer.is-open {
    transform: none;
  }
}

/* ============================================================
 * HTML MARKUP CLASS ALIASES
 * The HTML uses .site-nav / .nav-drawer / .nav-toggle / .nav-backdrop.
 * These rules map those to the same visual spec as the .nav__* counterparts.
 * ============================================================ */

/* Desktop nav list */
.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  list-style: none;
}

/* Desktop nav links */
.site-nav__link {
  font-family: var(--font-sans);
  font-size: var(--fs-nav);
  font-weight: 500;
  color: var(--c-white);
  text-decoration: none;
  position: relative;
  padding-block: var(--sp-2);
  transition: color var(--dur-micro) var(--ease-out);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--c-copper);
  transition: width var(--dur-short) var(--ease-out);
}

.site-nav__link:hover {
  color: var(--c-copper);
}

.site-nav__link:hover::after {
  width: 100%;
}

.site-nav__link.is-active {
  color: var(--c-copper);
}

.site-nav__link.is-active::after {
  width: 100%;
}

/* Header brand */
.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  text-decoration: none;
  flex-shrink: 0;
}

.site-header__brand::after {
  display: none;
}

.site-header__logo-text {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--c-white);
  line-height: 1;
}

.site-header__logo-text:hover {
  opacity: 0.85;
}

/* Official logo — SVG comes pre-designed for dark backgrounds
 * (copper gear + white wordmark + copper tagline). No filter needed. */
.site-header__logo-img {
  display: block;
  height: 60px;
  width: auto;
  transition:
    opacity var(--dur-micro) var(--ease-out),
    height  var(--dur-short) var(--ease-out);
}

.site-header__brand:hover .site-header__logo-img {
  opacity: 0.9;
}

.site-header.is-compact .site-header__logo-img {
  height: 48px;
}

@media (max-width: 900px) {
  .site-header__logo-img { height: 48px; }
  .site-header.is-compact .site-header__logo-img { height: 40px; }
}

/* Header actions (lang switcher + hamburger wrapper) */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

/* Hamburger button (mobile only) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--sp-2);
  border-radius: var(--radius-sm);
  transition: background-color var(--dur-micro) var(--ease-out);
}

.nav-toggle:hover {
  background-color: rgb(255 255 255 / 0.1);
}

.nav-toggle__bar {
  display: block;
  width: 24px;
  height: 1.5px;
  background-color: var(--c-white);
  border-radius: 2px;
  transform-origin: center;
  transition:
    transform  var(--dur-short) var(--ease-out),
    opacity    var(--dur-short) var(--ease-out);
}

/* Open state — X icon */
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile drawer */
.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  background-color: var(--c-navy);
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  padding: var(--sp-7) var(--sp-6);
  transform: translateX(100%);
  transition: transform var(--dur-medium) var(--ease-out);
  overflow-y: auto;
}

.nav-drawer.is-open {
  transform: translateX(0);
}

/* Drawer close button — first child of the drawer, top-right. Gives keyboard
 * and switch users an explicit, labelled exit (the JS wires a handler to this).
 * 44px tap target, copper on hover. (#5) */
.nav-drawer__close {
  position: absolute;
  top: var(--sp-4);
  right: var(--sp-4);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: var(--sp-2);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--c-white);
  cursor: pointer;
  line-height: 1;
  font-size: 1.5rem;
  transition:
    color            var(--dur-micro) var(--ease-out),
    background-color var(--dur-micro) var(--ease-out);
}

.nav-drawer__close:hover {
  color: var(--c-copper);
  background-color: rgb(255 255 255 / 0.1);
}

.nav-drawer__close::after {
  display: none; /* suppress base.css link underline if rendered as <a> */
}

/* Inline SVG / glyph inside the close button inherits colour */
.nav-drawer__close svg {
  width: 22px;
  height: 22px;
}

/* Drawer backdrop */
.nav-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgb(6 20 41 / 0.7);
  z-index: calc(var(--z-overlay) - 1);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-medium) var(--ease-out);
  backdrop-filter: blur(4px);
}

.nav-backdrop.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* Drawer nav links */
.nav-drawer__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-top: var(--sp-7);
}

.nav-drawer__link {
  font-family: var(--font-serif);
  font-size: var(--fs-h3);
  font-weight: 500;
  color: var(--c-white);
  text-decoration: none;
  padding: var(--sp-3) 0;
  border-bottom: 1px solid rgb(255 255 255 / 0.07);
  display: block;
  transition: color var(--dur-micro) var(--ease-out);
}

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

.nav-drawer__link:hover {
  color: var(--c-copper);
}

.nav-drawer__link.is-active {
  color: var(--c-copper);
}

/* Drawer language switcher */
.nav-drawer__lang {
  margin-top: auto;
  padding-top: var(--sp-6);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

/* ============================================================
 * MOBILE BREAKPOINT — FINAL OVERRIDE
 * Source-order override for .nav-toggle and .site-nav visibility.
 * The earlier base rules (display:none for toggle, display:flex for
 * site-nav) win over the @media block above due to declaration order,
 * so we re-apply mobile rules here at the end of the cascade.
 * ============================================================ */
@media (max-width: 900px) {
  .site-nav { display: none; }
  .nav-toggle { display: flex; }
}

/* ============================================================
 * FOOTER LOGO IMAGE
 * ============================================================ */
.site-footer__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  text-decoration: none;
}

.site-footer__logo::after { display: none; }

.site-footer__logo-img {
  display: block;
  height: 64px;
  width: auto;
  transition: opacity var(--dur-micro) var(--ease-out);
}

.site-footer__logo:hover .site-footer__logo-img { opacity: 0.9; }

/* ============================================================
 * 404 BRAND IMAGE
 * ============================================================ */
.page-404__brand-img {
  display: block;
  height: 72px;
  width: auto;
}