/* Header-specific styles for Lato Kara
   Builds on base.css (variables, layout, typography)
*/

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  backdrop-filter: blur(16px);
  background: linear-gradient(to bottom, rgba(13, 20, 33, 0.96), rgba(13, 20, 33, 0.88));
  border-bottom: 1px solid rgba(217, 190, 138, 0.2);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

/* Brand area */
.site-header__brand {
  display: flex;
  align-items: center;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-heading);
}

.site-header__logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 20%, var(--color-highlight), var(--color-accent));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--color-bg);
  box-shadow: var(--shadow-soft);
}

.site-header__logo-text {
  display: flex;
  flex-direction: column;
}

.site-header__logo-title {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-header__logo-subtitle {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-text-muted);
}


/* Navigation */
.site-header__nav-wrapper {
  display: flex;
  align-items: center;
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.site-nav__item a {
  color: var(--color-text);
  opacity: 0.9;
  position: relative;
}

.site-nav__item a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--color-highlight), var(--color-accent));
  transition: width var(--transition-normal);
}

.site-nav__item a:hover::after,
.site-nav__item a[aria-current="page"]::after {
  width: 100%;
}

.site-nav__item--cta a {
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn--nav-cta {
  padding-inline: 1.5rem;
  font-size: var(--font-size-xs);
}

/* Mobile menu toggle */
.site-header__toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid rgba(217, 190, 138, 0.4);
  background: rgba(5, 7, 13, 0.85);
  align-items: center;
  justify-content: center;
  gap: 4px;
  cursor: pointer;
  color: var(--color-heading);
}

.site-header__toggle-line {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--color-heading);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.site-header__toggle:focus-visible {
  outline: 2px solid var(--color-highlight);
  outline-offset: 3px;
}

/* Toggle animation states */
.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

/* Responsive behavior */
@media (max-width: 768px) {
  .site-header__toggle {
    display: inline-flex;
    flex-direction: column;
  }

  .site-header__nav-wrapper {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: radial-gradient(circle at top center, rgba(217, 190, 138, 0.12), rgba(13, 20, 33, 0.98));
    border-bottom: 1px solid rgba(217, 190, 138, 0.18);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.7);
    transform-origin: top;
  }

  .site-header__nav {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--space-4) var(--space-6);
  }

  /* Menu is visible by default if JS is disabled; JS adds .is-collapsed */
  .site-header__nav-wrapper.is-collapsed {
    display: none;
  }

  .site-nav__item--cta {
    width: 100%;
  }

  .site-nav__item--cta .btn--nav-cta {
    width: 100%;
    justify-content: center;
  }
}

@media (min-width: 769px) {
  .site-header__nav-wrapper {
    position: static;
    box-shadow: none;
    border-bottom: none;
  }
}

/* High-contrast focus for nav links */
.site-header__nav a:focus-visible {
  outline: 2px solid var(--color-highlight);
  outline-offset: 4px;
}