/**
 * Site header — Experience V2 Sprint 1
 * content-source: config/header.json + config/brand.json
 */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: color-mix(in srgb, var(--color-surface) 88%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--color-border-subtle) 80%, transparent);
  box-shadow: var(--shadow-header);
  backdrop-filter: blur(12px);
}

.site-header .container {
  height: 100%;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
  height: 100%;
}

.site-header__logo-text {
  color: var(--color-primary);
}

.site-header__menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  padding: var(--spacing-sm);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-primary);
  background-color: transparent;
  cursor: pointer;
}

.site-header__menu-toggle:hover {
  background-color: color-mix(in srgb, var(--color-primary) 6%, transparent);
}

.site-header__menu-toggle:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

.site-header__menu-icon {
  position: relative;
  display: block;
  width: 1.25rem;
  height: 2px;
  background-color: currentColor;
  border-radius: 1px;
  transition: background-color 0.15s ease;
}

.site-header__menu-icon::before,
.site-header__menu-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  border-radius: 1px;
  transition: transform 0.15s ease, top 0.15s ease;
}

.site-header__menu-icon::before {
  top: -6px;
}

.site-header__menu-icon::after {
  top: 6px;
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-icon {
  background-color: transparent;
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__menu-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

.site-header__nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 99;
  padding: var(--spacing-md) var(--container-padding-x) var(--spacing-lg);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border-subtle);
  box-shadow: var(--shadow-md);
}

.site-header__nav--open {
  display: block;
}

.site-header__nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin: 0 0 var(--spacing-md);
  padding: 0;
  list-style: none;
}

.site-header__nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  text-decoration: none;
  border-radius: var(--radius-md);
}

.site-header__nav-link:hover {
  color: var(--color-primary);
  background-color: color-mix(in srgb, var(--brand-accent) 8%, transparent);
}

.site-header__nav-link:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

.site-header__cta {
  width: 100%;
}

@media (min-width: 768px) {
  .site-header__menu-toggle {
    display: none;
  }

  .site-header__nav {
    display: flex;
    position: static;
    align-items: center;
    gap: var(--spacing-lg);
    padding: 0;
    background-color: transparent;
    border-bottom: none;
    box-shadow: none;
  }

  .site-header__nav-list {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: 0;
  }

  .site-header__nav-link {
    padding: var(--spacing-sm);
    font-size: var(--font-size-caption);
  }

  .site-header__cta {
    width: auto;
    flex-shrink: 0;
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
  }
}

@media (min-width: 1280px) {
  .site-header__nav {
    gap: var(--spacing-xl);
  }

  .site-header__nav-link {
    font-size: var(--font-size-body);
    padding: var(--spacing-sm) var(--spacing-md);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__menu-icon,
  .site-header__menu-icon::before,
  .site-header__menu-icon::after {
    transition: none;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    backdrop-filter: none;
    background-color: var(--color-surface);
  }
}