/* ==========================================================================
   HEADER + MOBILE NAVIGATION
   --------------------------------------------------------------------------
   Theme logic (driven by assets/js/components/header.js):
   • .site-header--dark  → the section under the header is navy
                           (white text, logo reversed via CSS filter)
   • .site-header--light → the section under the header is light
                           (ink text, original logo colours)
   • .is-scrolled        → page has left the very top: glass background
   • .is-menu-open       → mobile overlay is open: header forced to dark
   Sections opt in with data-header-theme="dark" | "light".
   ========================================================================== */

/* ---------------------------------------------------------------------------
   1. Header bar
   --------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: var(--z-header);
  block-size: var(--header-h);
  color: var(--c-ink);
  transition:
    background-color var(--dur-micro) var(--ease-out),
    box-shadow var(--dur-micro) var(--ease-out),
    color var(--dur-micro) var(--ease-out);
}

/* Glass layer lives on a pseudo-element so the blur never affects children */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0;
  background-color: rgba(255, 255, 255, 0.82);
  border-block-end: 1px solid var(--c-ink-a10);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  transition: opacity var(--dur-micro) var(--ease-out),
              background-color var(--dur-micro) var(--ease-out);
}

.site-header.is-scrolled::before {
  opacity: 1;
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

/* Dark theme: white content, navy glass when scrolled */
.site-header--dark {
  color: var(--c-on-dark);
}

.site-header--dark::before {
  background-color: rgba(2, 17, 58, 0.72);
  border-block-end-color: var(--c-glass-border);
}

/* Menu open: always dark. The bar becomes a near-solid navy veil so menu
   content scrolling up beneath it never shows through the logo / close icon. */
.site-header.is-menu-open {
  color: var(--c-on-dark);
  box-shadow: none;
}

.site-header.is-menu-open::before {
  opacity: 1;
  background-color: rgba(2, 17, 58, 0.94);
  border-block-end-color: var(--c-glass-border);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  block-size: 100%;
}

/* ---------------------------------------------------------------------------
   2. Brand logo — reversed on navy with a CSS filter (no duplicate asset)
   --------------------------------------------------------------------------- */
.site-header__brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  min-block-size: 44px;
  border-radius: var(--r-btn);
}

.site-header__logo {
  inline-size: clamp(7.5rem, 6.8rem + 2vw, 8.75rem); /* ≥ 120px brand minimum */
  block-size: auto;
  transition: filter var(--dur-micro) var(--ease-out);
}

.site-header--dark .site-header__logo,
.site-header.is-menu-open .site-header__logo {
  filter: brightness(0) invert(1);
}

/* ---------------------------------------------------------------------------
   3. Desktop navigation (≥ 64rem)
   --------------------------------------------------------------------------- */
.site-nav {
  display: none;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.25rem, 1vw, 0.75rem);
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-block-size: 44px;
  padding-inline: var(--space-sm);
  font-size: var(--fs-small);
  font-weight: 500;
  color: inherit;
  opacity: 0.82;
  transition: opacity var(--dur-micro) var(--ease-out);
}

/* Teal indicator bar grows from inline-start on hover / active section */
.site-nav__link::after {
  content: "";
  position: absolute;
  inset-inline: var(--space-sm);
  inset-block-end: 0.55rem;
  block-size: 2px;
  border-radius: var(--r-pill);
  background-color: var(--c-teal);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-micro) var(--ease-out);
}

[dir="rtl"] .site-nav__link::after {
  transform-origin: right center;
}

.site-nav__link:hover,
.site-nav__link[aria-current="true"] {
  opacity: 1;
}

.site-nav__link:hover::after,
.site-nav__link[aria-current="true"]::after {
  transform: scaleX(1);
}

/* ---------------------------------------------------------------------------
   4. Actions: language toggle (feature-flagged), CTA, menu button
   --------------------------------------------------------------------------- */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.site-header__cta {
  display: none;
  min-block-size: 2.75rem;
  padding-block: 0.625rem;
  padding-inline: 1.125rem;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  min-block-size: 44px;
  padding-inline: var(--space-sm);
  border-radius: var(--r-btn);
  font-size: var(--fs-small);
  font-weight: 600;
  color: inherit;
}

.lang-toggle svg {
  inline-size: 1.125rem;
  block-size: 1.125rem;
}

/* Hamburger → close morph (three bars, pure CSS state transition) */
.menu-toggle {
  position: relative;
  display: inline-grid;
  place-items: center;
  inline-size: 2.75rem;
  block-size: 2.75rem;
  border-radius: var(--r-btn);
  border: 1px solid currentColor;
  border-color: color-mix(in srgb, currentColor 22%, transparent);
  /* Soft frosted fill so the icon never sits on raw page content */
  background-color: color-mix(in srgb, currentColor 8%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: inherit;
  transition: border-color var(--dur-micro) var(--ease-out),
              background-color var(--dur-micro) var(--ease-out);
}

.menu-toggle:hover {
  border-color: var(--c-teal);
  background-color: var(--c-teal-a12);
}

/* Close state: soft teal-tinted tile on the navy bar */
.menu-toggle[aria-expanded="true"] {
  background-color: rgba(0, 169, 182, 0.14);
  border-color: rgba(0, 169, 182, 0.45);
}

.menu-toggle__bars {
  position: relative;
  inline-size: 1.25rem;
  block-size: 0.875rem;
}

.menu-toggle__bar {
  position: absolute;
  inset-inline-start: 0;
  inline-size: 100%;
  block-size: 2px;
  border-radius: var(--r-pill);
  background-color: currentColor;
  transition:
    transform 0.35s var(--ease-in-out),
    opacity 0.2s var(--ease-out),
    inline-size 0.35s var(--ease-in-out),
    background-color var(--dur-micro) var(--ease-out);
}

.menu-toggle__bar:nth-child(1) { inset-block-start: 0; }
.menu-toggle__bar:nth-child(2) { inset-block-start: calc(50% - 1px); inline-size: 70%; }
.menu-toggle__bar:nth-child(3) { inset-block-end: 0; }

/* Middle bar extends to full width on hover — a subtle "ready" cue */
.menu-toggle:hover .menu-toggle__bar:nth-child(2) {
  inline-size: 100%;
}

/* Open state: top & bottom bars cross into an X, middle bar retracts */
.menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(1) {
  transform: translateY(0.375rem) rotate(45deg);
  background-color: var(--c-teal);
}

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

.menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(3) {
  transform: translateY(-0.375rem) rotate(-45deg);
  background-color: var(--c-teal);
}

/* ---------------------------------------------------------------------------
   5. Mobile overlay menu
   --------------------------------------------------------------------------- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-header) - 1);
  display: flex;
  flex-direction: column;
  padding-block-start: calc(var(--header-h) + var(--space-lg));
  padding-block-end: var(--space-xl);
  overflow-y: auto;
  overscroll-behavior: contain;
  background-color: var(--c-navy);
  color: var(--c-on-dark-body);
}

.mobile-menu[hidden] {
  display: none;
}

/* Soft brand glows — clipped in their own layer */
.mobile-menu__decor {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.mobile-menu__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
}

.mobile-menu__glow--teal {
  inset-block-start: -10%;
  inset-inline-end: -25%;
  inline-size: 70vmax;
  block-size: 70vmax;
  background: radial-gradient(circle, rgba(0, 169, 182, 0.28), transparent 65%);
}

.mobile-menu__glow--deep {
  inset-block-end: -20%;
  inset-inline-start: -30%;
  inline-size: 80vmax;
  block-size: 80vmax;
  background: radial-gradient(circle, rgba(1, 62, 106, 0.9), transparent 60%);
}

/* Pixel-F cluster — scattered data blocks, echoing the brand mark */
.mobile-menu__pixels {
  position: absolute;
  inset-block-start: calc(var(--header-h) + 1rem);
  inset-inline-end: var(--gutter);
  inline-size: 7.5rem;
  block-size: auto;
  opacity: 0.55;
}

[dir="rtl"] .mobile-menu__pixels {
  scale: -1 1;
}

.mobile-menu__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
  flex: 1;
}

.mobile-menu__list {
  display: grid;
  gap: var(--space-2xs);
}

.mobile-menu__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-block-size: 3.5rem;
  padding-block: var(--space-sm);
  border-block-end: 1px solid var(--c-glass-border);
  font-family: var(--ff-display);
  font-size: var(--fs-h3);
  font-weight: 600;
  color: var(--c-on-dark);
  transition: color var(--dur-micro) var(--ease-out),
              padding-inline-start var(--dur-micro) var(--ease-out);
}

.mobile-menu__link svg {
  inline-size: 1.25rem;
  block-size: 1.25rem;
  flex-shrink: 0;
  color: var(--c-teal);
  transition: transform var(--dur-micro) var(--ease-out);
}

[dir="rtl"] .mobile-menu__link svg {
  scale: -1 1;
}

.mobile-menu__link:hover,
.mobile-menu__link[aria-current="true"] {
  color: var(--c-teal);
  padding-inline-start: var(--space-xs);
}

.mobile-menu__link:hover svg {
  transform: translateX(4px);
}

/* Visual card: warm photo + CTAs at the foot of the menu */
.mobile-menu__card {
  display: grid;
  gap: var(--space-lg);
  margin-block-start: auto;
  padding: var(--space-md);
  border-radius: var(--r-panel);
  border: 1px solid var(--c-glass-border);
  background-color: var(--c-glass);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}

.mobile-menu__media {
  overflow: hidden;
  border-radius: var(--r-card);
  aspect-ratio: 16 / 9;
}

.mobile-menu__media img {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
}

.mobile-menu__card .btn-group {
  flex-direction: column;
  align-items: stretch;
}

/* Tablet: photo beside the CTAs to keep a two-column structure */
@media (min-width: 40rem) {
  .mobile-menu__card {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

/* Prevent background scroll while the overlay is open */
html.is-menu-locked {
  overflow: hidden;
}

/* ---------------------------------------------------------------------------
   6. Breakpoints
   --------------------------------------------------------------------------- */
@media (min-width: 40rem) {
  .site-header__cta {
    display: inline-flex;
  }
}

@media (min-width: 64rem) {
  .site-nav {
    display: block;
  }

  .menu-toggle,
  .mobile-menu {
    display: none;
  }
}