/* P-006 · Header + mobile nav */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-line);
}

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

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-ink);
  flex-shrink: 0;
}

.brand__mark {
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  line-height: 1;
}

@media (min-width: 1024px) {
  .brand__name {
    font-size: 1.25rem;
  }
}

.site-header__nav {
  display: none;
}

.site-header__list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}

.site-header__link {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--color-ink);
  transition: color var(--transition-fast);
}

.site-header__link:hover,
.site-header__link[aria-current="page"] {
  color: var(--color-brand);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.site-header__cta {
  display: none;
}

.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-ink);
  border-radius: var(--radius-sm);
}

.menu-toggle__icon {
  width: 24px;
  height: 24px;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__open {
  display: none;
}

.menu-toggle[aria-expanded="false"] .menu-toggle__close,
.menu-toggle:not([aria-expanded="true"]) .menu-toggle__close {
  display: none;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__close {
  display: block;
}

@media (min-width: 1024px) {
  .site-header__nav {
    display: block;
  }

  .site-header__cta {
    display: inline-flex;
  }

  .menu-toggle {
    display: none;
  }
}

/* Mobile drawer */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: var(--z-menu);
  display: flex;
  flex-direction: column;
  background: var(--color-bg-elevated);
  padding: var(--space-4);
  padding-top: calc(var(--header-height) + var(--space-4));
  transform: translateX(100%);
  visibility: hidden;
  transition: transform var(--transition-fast), visibility var(--transition-fast);
}

.mobile-nav.is-open {
  transform: translateX(0);
  visibility: visible;
}

.mobile-nav__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
  flex: 1;
}

.mobile-nav__link {
  display: block;
  padding-block: var(--space-4);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.125rem;
  text-decoration: none;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
}

.mobile-nav__footer {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-block: var(--space-6);
}

body.nav-open {
  overflow: hidden;
}

@media (min-width: 1024px) {
  .mobile-nav {
    display: none;
  }
}