/* header.css - Site header branding, nav shell, and sticky header behavior. */
/* Sections: Header container, brand/logo area, action controls, and sticky/responsive behavior. */

/* Core header styles */

/* Primary style rules */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--clr-border);
  z-index: var(--z-header);
  transition: box-shadow var(--transition-normal);
}


/* Interaction and state styles */

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

.header-container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}



.header-brand {
  flex-shrink: 0;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  text-decoration: none;
}

.logo-link:hover,
.logo-link:focus-visible {
  color: inherit;
  text-decoration: none;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-base);
  object-fit: contain;
  pointer-events: none;
}

.brand-name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: var(--fw-extrabold);
  letter-spacing: -0.03em;
  line-height: 1;
  /* Professional two-tone gradient: deep green → vivid brand green */
  background: linear-gradient(135deg, var(--clr-primary-800) 0%, var(--clr-primary-600) 55%, var(--clr-primary-500) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  /* Fallback for browsers without background-clip: text */
  color: var(--clr-brand);
}



.main-nav--desktop {
  display: none;
  flex: 1;
  justify-content: center;
}

/* Responsive overrides */

@media (min-width: 900px) {
  .main-nav--desktop {
    display: flex;
  }
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-text-secondary);
  border-radius: var(--radius-base);
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--clr-brand);
  background: var(--clr-brand-light);
  text-decoration: none;
}

.nav-link--active,
.nav-link[aria-current="page"] {
  color: var(--clr-brand);
  background: var(--clr-brand-medium);
  font-weight: var(--fw-semibold);
}



.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-shrink: 0;
}


.lang-selector {
  position: relative;
  display: none;
}

@media (min-width: 900px) {
  .lang-selector {
    display: block;
  }
}

.lang-selector-btn {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  padding: var(--sp-2) var(--sp-3);
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-base);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-text-secondary);
  cursor: pointer;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast);
  user-select: none;
}

.lang-selector-btn:hover {
  background: var(--clr-brand-light);
  border-color: var(--clr-primary-200);
  color: var(--clr-brand);
}

.lang-selector-btn .material-icons {
  font-size: 18px;
}

.lang-selector-btn .chevron-icon {
  font-size: 16px;
  transition: transform var(--transition-fast);
}

.lang-selector-btn[aria-expanded="true"] .chevron-icon {
  transform: rotate(180deg);
}


.lang-dropdown {
  position: absolute;
  top: calc(100% + var(--sp-2));
  right: 0;
  min-width: 160px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  z-index: var(--z-nav);
  animation: dropdown-enter var(--duration-normal) var(--ease-spring) both;
}

@keyframes dropdown-enter {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.lang-option {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  width: 100%;
  padding: var(--sp-3) var(--sp-4);
  background: none;
  border: none;
  border-radius: 0;
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.lang-option:hover {
  background: var(--clr-surface-2);
  color: var(--clr-text);
}

.lang-option--active {
  background: var(--clr-brand-light);
  color: var(--clr-brand);
}

.flag-icon {
  width: 22px;
  height: 15px;
  border-radius: 2px;
  flex-shrink: 0;
  overflow: hidden;
}

.lang-name { flex: 1; text-align: left; }

.check-icon {
  font-size: 16px !important;
  color: var(--clr-brand);
}

.check-icon--hidden {
  opacity: 0;
}


.current-language {
  display: none;
}

@media (min-width: 640px) {
  .current-language {
    display: inline;
  }
}



.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-base);
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

.mobile-menu-btn:hover {
  background: var(--clr-surface-2);
}

.menu-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-text-secondary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-normal), opacity var(--transition-fast);
  transform-origin: center;
}


.mobile-menu-btn.is-open .menu-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-menu-btn.is-open .menu-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.mobile-menu-btn.is-open .menu-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 900px) {
  .mobile-menu-btn {
    display: none;
  }
}