/* ============================================
   Site Header
   Logo, nav, theme toggle, emergency CTA, mobile hamburger
   Sticky on scroll
   ============================================ */

/* --- Header wrapper --- */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base);
}

/* Shadow when scrolled */
.site-header.is-scrolled {
  box-shadow: var(--shadow-md);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-3) var(--container-px);
  padding-left: var(--space-4);
}

/* --- Logo --- */

.site-header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  text-decoration: none;
  flex-shrink: 0;
}

.site-header__logo-img {
  width: 32px;
  height: 32px;
}

.site-header__logo-text {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1;
}

/* --- Navigation --- */

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-header__nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-size: var(--fs-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition:
    color var(--transition-base),
    background-color var(--transition-base);
  white-space: nowrap;
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
  color: var(--color-text);
  background-color: var(--color-bg-alt);
}

.site-header__nav-link[aria-current='page'] {
  color: var(--color-accent);
  font-weight: 600;
}

/* --- Dropdown for Services --- */

.site-header__dropdown {
  position: relative;
}

.site-header__dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.site-header__dropdown-trigger svg {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-fast);
}

.site-header__dropdown:hover .site-header__dropdown-trigger svg,
.site-header__dropdown:focus-within .site-header__dropdown-trigger svg {
  transform: rotate(180deg);
}

.site-header__dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  padding: var(--space-2);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--transition-fast),
    visibility var(--transition-fast);
  z-index: var(--z-dropdown);
  margin-top: var(--space-1);
}

.site-header__dropdown:hover .site-header__dropdown-menu,
.site-header__dropdown:focus-within .site-header__dropdown-menu {
  opacity: 1;
  visibility: visible;
}

.site-header__dropdown-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.site-header__dropdown-link:hover,
.site-header__dropdown-link:focus-visible {
  color: var(--color-accent);
  background-color: var(--color-bg-alt);
}

/* --- Right side actions (theme toggle + CTA) --- */

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

/* --- Theme toggle --- */

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition:
    color var(--transition-base),
    border-color var(--transition-base),
    background-color var(--transition-base);
}

.theme-toggle:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: var(--color-accent-bg);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* Show/hide sun/moon based on theme */
.theme-toggle__sun { display: none; }
.theme-toggle__moon { display: block; }

[data-theme='dark'] .theme-toggle__sun { display: block; }
[data-theme='dark'] .theme-toggle__moon { display: none; }

/* --- Mobile hamburger button --- */

.site-header__hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
}

.site-header__hamburger svg {
  width: 24px;
  height: 24px;
}

/* Show hamburger icon, hide close icon by default */
.site-header__hamburger .icon-close { display: none; }
.site-header__hamburger .icon-menu { display: block; }

.site-header__hamburger[aria-expanded='true'] .icon-close { display: block; }
.site-header__hamburger[aria-expanded='true'] .icon-menu { display: none; }

/* --- Mobile nav overlay --- */

@media (max-width: 768px) {
  .site-header__hamburger {
    display: inline-flex;
    /* Must be above the nav overlay (z-overlay: 100) to remain clickable */
    position: relative;
    z-index: calc(var(--z-overlay) + 1);
  }

  .site-header__nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-overlay);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: calc(60px + var(--space-6)) var(--container-px) var(--space-6);
    background-color: var(--color-surface);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-base);
  }

  .site-header__nav.is-open {
    transform: translateX(0);
  }

  .site-header__nav-link {
    padding: var(--space-4) var(--space-4);
    font-size: var(--fs-md);
    border-bottom: 1px solid var(--color-border-light);
    border-radius: 0;
  }

  /* Dropdown behaves differently on mobile */
  .site-header__dropdown-menu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    border: none;
    padding: 0;
    padding-left: var(--space-4);
    margin-top: 0;
    background: transparent;
  }

  .site-header__dropdown-trigger svg {
    display: none;
  }

  .site-header__dropdown-link {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
    border-radius: 0;
  }

  /* Hide desktop CTA in header on mobile — it's in the sticky CTA instead */
  .site-header__actions .btn--emergency {
    display: none;
  }
}

/* --- Desktop: ensure nav is visible --- */

@media (min-width: 769px) {
  .site-header__nav {
    transform: none;
    position: static;
    padding: 0;
    background: transparent;
    overflow: visible;
  }
}