/* ====================================================================
   HEADER.CSS — Elements India
   --------------------------------------------------------------------
   Styles for components/header.html.
   Sticky behaviour class (.site-header--scrolled) is toggled by
   navigation.js on scroll.
   ==================================================================== */


/* --------------------------------------------------------------------
   1. HEADER SHELL
   -------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-line);
  transition: box-shadow var(--duration-base) var(--ease-standard),
              background-color var(--duration-base) var(--ease-standard);
}

/* Toggled by navigation.js once the page has scrolled past a threshold */
.site-header--scrolled {
  box-shadow: var(--shadow-soft);
}


/* --------------------------------------------------------------------
   0. CREDENTIAL TOP BAR — dark utility strip above the nav
   -------------------------------------------------------------------- */

.site-header__topbar {
  background-color: var(--color-slate);
  border-bottom: 1px solid var(--color-slate-light);
}

.topbar__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 7px var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.62);
}

.topbar__cred {
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar__cred::before {
  content: "";
  width: 16px;
  height: 1px;
  background-color: var(--color-rust);
  flex-shrink: 0;
}

.topbar__meta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.topbar__meta a:hover { color: var(--color-white); }
.topbar__sep { opacity: 0.4; }


.site-header__inner {
  max-width: var(--container-max);
  min-height: var(--header-height);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}


/* --------------------------------------------------------------------
   2. BRAND
   -------------------------------------------------------------------- */

.brand {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
}

.brand__logo {
  height: 60px;
  width: auto;
}


/* --------------------------------------------------------------------
   3. PRIMARY NAV (desktop)
   -------------------------------------------------------------------- */

.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-7);
  flex: 1;
  justify-content: flex-end;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink);
  padding: var(--space-2) 0;
  position: relative;
}

/* Underline grows from left on hover / active — small, functional motion */
.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  background-color: var(--color-rust);
  transition: width var(--duration-base) var(--ease-standard);
}

.nav-link:hover::after,
.nav-link.is-active::after {
  width: 100%;
}

.nav-link.is-active {
  color: var(--color-rust);
}

.nav-link--dropdown-toggle {
  cursor: pointer;
}

.nav-caret {
  width: 8px;
  height: 8px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform var(--duration-fast) var(--ease-standard);
  margin-top: -4px;
}

.nav-item--dropdown[data-open="true"] .nav-caret {
  transform: rotate(-135deg);
  margin-top: 2px;
}


/* --------------------------------------------------------------------
   4. DROPDOWN MENU (desktop)
   -------------------------------------------------------------------- */

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-4));
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  width: 260px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-soft);
  padding: var(--space-3);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-standard),
              transform var(--duration-base) var(--ease-standard),
              visibility var(--duration-base);
}

.nav-item--dropdown[data-open="true"] .dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dropdown-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  transition: background-color var(--duration-fast) var(--ease-standard);
}

.dropdown-link:hover {
  background-color: var(--color-paper-dim);
}

.dropdown-link__title {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-ink);
}

.dropdown-link__meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-stone);
}

.dropdown-menu__all {
  border-top: 1px solid var(--color-line);
  margin-top: var(--space-2);
  padding-top: var(--space-2);
}

.dropdown-link--all {
  padding: var(--space-3);
  font-size: var(--fs-xs);
  color: var(--color-rust);
  font-weight: 600;
}

.dropdown-link--all:hover {
  background-color: transparent;
  text-decoration: underline;
}


/* --------------------------------------------------------------------
   5. NAV CTA (desktop)
   -------------------------------------------------------------------- */

.nav-cta {
  flex-shrink: 0;
}


/* --------------------------------------------------------------------
   6. MOBILE HAMBURGER TOGGLE
   Hidden on desktop, shown at the breakpoint set in responsive.css
   -------------------------------------------------------------------- */

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-ink);
  transition: transform var(--duration-base) var(--ease-standard),
              opacity var(--duration-fast) var(--ease-standard);
}

/* Toggled to an "X" by navigation.js adding .nav-toggle--open */
.nav-toggle--open .nav-toggle__bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle--open .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle--open .nav-toggle__bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}


/* --------------------------------------------------------------------
   7. TOP BAR — hidden on mobile to reclaim vertical space
   -------------------------------------------------------------------- */

@media (max-width: 768px) {
  .site-header__topbar {
    display: none;
  }
}