/* SPARK Logistics — Header / navigation
   Transparent over hero → solid on scroll. Mega-menu-ready. */

.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: var(--z-header);
  color: var(--color-white);
  border-block-end: 1px solid transparent;
  transition:
    background-color var(--dur-med) var(--ease-out),
    box-shadow var(--dur-med) var(--ease-out),
    border-color var(--dur-med) var(--ease-out);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(1rem, 2.5vw, 2.5rem);
  block-size: var(--header-h);
  transition: block-size var(--dur-med) var(--ease-out);
}

.site-header.is-scrolled {
  background: var(--color-white);
  color: var(--color-primary);
  border-block-end-color: rgba(15, 62, 117, 0.08);
  box-shadow: var(--shadow-header);
}

.site-header.is-scrolled .header-inner {
  block-size: var(--header-h-scrolled);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(to bottom, rgba(7, 28, 51, 0.62), rgba(7, 28, 51, 0));
  opacity: 1;
  transition: opacity var(--dur-med) ease;
}

.site-header.is-scrolled::before,
.site-header.nav-open::before { opacity: 0; }

/* Logo */
.brand {
  display: inline-flex;
  align-items: center;
  flex: none;
  text-decoration: none;
}

/* Logos stack in one cell and crossfade with the header state:
   white over the transparent navy hero, colorful once the header turns white */
.brand-mark {
  display: grid;
  place-items: center;
}

.brand-mark .logo {
  grid-area: 1 / 1;
  block-size: clamp(2rem, 3vw, 2.5rem);
  inline-size: auto;
  transition: opacity var(--dur-med) var(--ease-out);
}

.brand .logo--colorful { opacity: 0; }

.site-header.is-scrolled .brand .logo--white { opacity: 0; }
.site-header.is-scrolled .brand .logo--colorful { opacity: 1; }

/* Main nav */
.main-nav > ul {
  display: flex;
  align-items: center;
  gap: clamp(0.25rem, 1vw, 0.9rem);
}

.nav-item { position: relative; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 0.85rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
  border-radius: var(--radius-sm);
}

.nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0.85rem;
  inset-block-end: 0.28rem;
  block-size: 2px;
  background: var(--color-secondary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-med) var(--ease-out);
}

html[dir="rtl"] .nav-link::after {
  transform-origin: right;
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-item.is-open > .nav-link::after,
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-caret {
  inline-size: 0.7rem;
  block-size: 0.7rem;
  transition: rotate var(--dur-fast) var(--ease-out);
}

.nav-item.is-open > .nav-link .nav-caret { rotate: 180deg; }

/* Dropdown panel shell (mega-menu ready) */
.nav-panel {
  position: absolute;
  inset-block-start: calc(100% + 0.35rem);
  inset-inline-start: 50%;
  translate: -50% 0;
  min-inline-size: 17rem;
  padding: 0.75rem;
  background: var(--color-white);
  color: var(--color-text);
  border: 1px solid rgba(15, 62, 117, 0.08);
  border-radius: var(--radius-md);
  box-shadow: 0 30px 60px -20px rgba(7, 28, 51, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition:
    opacity var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out),
    visibility 0s linear var(--dur-fast);
}

html[dir="rtl"] .nav-panel { translate: 50% 0; }

.nav-item.is-open > .nav-panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition-delay: 0s;
}

.nav-panel ul { display: grid; gap: 2px; }

.nav-panel a {
  display: block;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-text);
  text-decoration: none;
}

.nav-panel a:hover,
.nav-panel a:focus-visible {
  background: var(--color-light-gray);
  color: var(--color-primary);
}

/* Right cluster */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex: none;
}

.lang-switch {
  display: inline-flex;
  padding: 0.32rem;
  border-radius: 99px;
  box-shadow: inset 0 0 0 1.5px currentColor;
}

.lang-btn {
  padding: 0.5em 0.95em;
  border-radius: 99px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: inherit;
  opacity: 0.72;
  transition: opacity var(--dur-fast) ease, background-color var(--dur-fast) ease, color var(--dur-fast) ease;
}

.lang-btn[aria-pressed="true"] {
  background: var(--color-secondary);
  color: var(--color-white);
  opacity: 1;
}

/* Burger */
.burger {
  display: grid;
  place-items: center;
  inline-size: 2.75rem;
  block-size: 2.75rem;
  border-radius: 50%;
}

.burger-lines {
  position: relative;
  inline-size: 1.35rem;
  block-size: 12px;
}

.burger-lines span {
  position: absolute;
  inset-inline: 0;
  block-size: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur-med) var(--ease-out), top var(--dur-med) var(--ease-out), opacity var(--dur-fast) ease;
}

.burger-lines span:nth-child(1) { inset-block-start: 0; }
.burger-lines span:nth-child(2) { inset-block-start: 5px; }
.burger-lines span:nth-child(3) { inset-block-start: 10px; }

.burger[aria-expanded="true"] .burger-lines span:nth-child(1) { inset-block-start: 5px; transform: rotate(45deg); }
.burger[aria-expanded="true"] .burger-lines span:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] .burger-lines span:nth-child(3) { inset-block-start: 5px; transform: rotate(-45deg); }

/* Breakpoint strategy:
   ≥1200px  full inline navigation, no burger
   <1200px  off-canvas mobile navigation (burger) */
.main-nav { display: none; }

@media (min-width: 1200px) {
  .main-nav { display: block; }
  .burger, .mobile-nav { display: none; }
}

/* Keep the last dropdown inside the viewport edge */
.nav-item:last-child .nav-panel {
  inset-inline-start: auto;
  inset-inline-end: 0;
  translate: none;
}