/* Header / navigation — Slice 3 */

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

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

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

.site-header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.site-header__logo img {
  display: block;
  width: 2.75rem;
  height: 2.75rem;
  max-width: none;
}

.site-header__logo:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.site-header__menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  min-width: 2.75rem;
  height: 2.75rem;
  min-height: 2.75rem;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  color: var(--color-text-on-light);
  cursor: pointer;
}

.site-header__menu-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.site-header__menu-icon {
  position: relative;
  display: block;
  width: 1.25rem;
  height: 2px;
  background-color: currentColor;
  transition: background-color var(--transition-fast);
}

.site-header__menu-icon::before,
.site-header__menu-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  transition: transform var(--transition-base);
}

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

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

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

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

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

.site-header__nav {
  font-family: var(--font-body);
}

.site-header__links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__links a {
  display: block;
  padding: var(--space-2) 0;
  color: var(--color-text-on-light);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.site-header__links a:hover {
  color: var(--color-accent);
}

.site-header__links a[aria-current="page"] {
  color: var(--color-accent);
  font-weight: 400;
}

.site-header__links a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.site-header__cta {
  white-space: nowrap;
}

.site-header__controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  margin-left: auto;
}

.site-header__theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  min-width: 2.75rem;
  height: 2.75rem;
  min-height: 2.75rem;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  color: var(--color-text-on-light);
  cursor: pointer;
}

.site-header__theme-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.site-header__theme-icon {
  display: block;
  width: 1.125rem;
  height: 1.125rem;
}

.site-header__theme-icon--sun {
  display: none;
}

[data-theme="dark"] .site-header__theme-icon--moon {
  display: none;
}

[data-theme="dark"] .site-header__theme-icon--sun {
  display: block;
}

.site-header__link-short {
  display: none;
}

@media (min-width: 48rem) and (max-width: 63.99rem) {
  .site-header__link-long {
    display: none;
  }

  .site-header__link-short {
    display: inline;
  }
}

/* Mobile nav panel */
@media (max-width: 47.99rem) {
  .site-header__menu-btn {
    display: flex;
    width: 3rem;
    min-width: 3rem;
    height: 3rem;
    min-height: 3rem;
  }

  .site-header__theme-btn {
    width: 3rem;
    min-width: 3rem;
    height: 3rem;
    min-height: 3rem;
  }

  /*
   * Homepage scroll-reveal uses transform on .site-header, which turns the
   * header into the containing block for position:fixed children — trapping
   * the nav panel inside the bar. Neutralize transform on mobile.
   */
  .page-home .site-header,
  .page-home .site-header.is-revealed,
  .page-home .site-header.is-revealed.is-scrolled {
    transform: none;
  }

  body.nav-open .site-header {
    z-index: var(--z-overlay);
  }

  .site-header__nav {
    position: fixed;
    inset: var(--header-height) 0 0 0;
    z-index: var(--z-overlay);
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
    padding: var(--space-6) var(--space-6) var(--space-10);
    background-color: var(--color-bg-light);
    border-top: 1px solid var(--color-border-light);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-0.5rem);
    transition:
      opacity var(--transition-base),
      visibility var(--transition-base),
      transform var(--transition-base);
  }

  .site-header__nav.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-header__links {
    display: flex;
    flex-direction: column;
    gap: 0;
    flex: 1;
  }

  .site-header__links li {
    border-bottom: 1px solid var(--color-border-light);
  }

  .site-header__links li:last-child {
    border-bottom: none;
  }

  .site-header__links a {
    padding: var(--space-4) 0;
    font-size: var(--font-size-lg);
    line-height: var(--line-height-snug);
  }

  .site-header__cta {
    width: 100%;
    justify-content: center;
    margin-top: auto;
  }

  body.nav-open {
    overflow: hidden;
  }
}

/* Desktop nav */
@media (min-width: 48rem) {
  .site-header__menu-btn {
    display: none;
  }

  .site-header__controls {
    margin-left: 0;
  }

  .site-header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    margin-left: auto;
  }

  .site-header__links {
    display: flex;
    align-items: center;
    gap: var(--space-6);
  }

  .site-header__links a {
    padding: var(--space-2) 0;
  }
}

/* Slice 13 — tablet header density */
@media (min-width: 48rem) and (max-width: 63.99rem) {
  .site-header__inner {
    gap: var(--space-3);
  }

  .site-header__nav {
    gap: var(--space-4);
  }

  .site-header__links {
    gap: var(--space-4);
  }

  .site-header__links a {
    font-size: var(--font-size-xs);
  }

  .site-header__cta {
    font-size: var(--font-size-xs);
    padding: var(--space-3) var(--space-4);
  }
}

/* Slice 13 — homepage header always available on mobile */
@media (max-width: 47.99rem) {
  .page-home .site-header {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
}

/* Homepage scroll-reveal (legacy ethos) — desktop only; mobile header is always visible */
@media (min-width: 48rem) {
  .page-home .site-header {
    position: fixed;
    left: 0;
    right: 0;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-0.75rem);
  }

  .page-home .site-header.is-revealed {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .page-home .site-header.is-revealed.is-scrolled {
    box-shadow: var(--shadow-sm);
    border-color: var(--color-border-light);
  }
}

@media (max-width: 47.99rem) {
  .page-home .site-header {
    position: sticky;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  @media (min-width: 48rem) {
    .page-home .site-header {
      transition: none;
    }

    .page-home .site-header.is-revealed {
      transform: none;
    }
  }

  .site-header__nav {
    transition: none;
  }

  .site-header__menu-icon::before,
  .site-header__menu-icon::after {
    transition: none;
  }
}

/* Spacer so fixed header does not cover content on inner pages */
.page-inner {
  flex: 1;
}

/* Services dropdown */
.site-header__dropdown {
  position: relative;
}

.site-header__dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: var(--space-2) 0;
  background: transparent;
  border: none;
  color: var(--color-text-on-light);
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.site-header__dropdown-trigger:hover,
.site-header__dropdown.is-open .site-header__dropdown-trigger {
  color: var(--color-accent);
}

.site-header__dropdown-trigger[aria-current="page"] {
  color: var(--color-accent);
}

.site-header__dropdown-trigger:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.site-header__dropdown-chevron {
  width: 0.875rem;
  height: 0.875rem;
  transition: transform var(--transition-fast);
}

.site-header__dropdown.is-open .site-header__dropdown-chevron {
  transform: rotate(180deg);
}

.site-header__dropdown-panel {
  display: none;
}

.site-header__dropdown-label {
  margin: 0 0 var(--space-2);
  font-family: var(--font-body);
  font-size: var(--font-size-xs);
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.site-header__dropdown-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__dropdown-list a {
  display: block;
  padding: var(--space-2) 0;
  color: var(--color-text-on-light);
  text-decoration: none;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-snug);
}

.site-header__dropdown-list a:hover {
  color: var(--color-accent);
}

.site-header__dropdown-all {
  display: block;
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border-light);
  color: var(--color-accent);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 400;
}

.site-header__dropdown-all:hover {
  text-decoration: underline;
}

@media (min-width: 48rem) {
  .site-header__dropdown-panel {
    position: absolute;
    top: calc(100% + var(--space-2));
    left: 50%;
    transform: translateX(-50%);
    z-index: calc(var(--z-header) + 1);
    min-width: 16rem;
    padding: var(--space-5);
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
  }

  .site-header__dropdown.is-open .site-header__dropdown-panel {
    display: block;
  }

  .site-header__dropdown-group + .site-header__dropdown-group {
    margin-top: var(--space-4);
  }
}

@media (max-width: 47.99rem) {
  .site-header__dropdown {
    border-bottom: 1px solid var(--color-border-light);
  }

  .site-header__dropdown-trigger {
    width: 100%;
    justify-content: space-between;
    padding: var(--space-4) 0;
    font-size: var(--font-size-lg);
  }

  .site-header__dropdown-panel {
    padding: 0 0 var(--space-4);
  }

  .site-header__dropdown.is-open .site-header__dropdown-panel {
    display: block;
  }

  .site-header__dropdown-list a {
    padding: var(--space-3) 0 var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
  }

  .site-header__dropdown-all {
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    padding-left: var(--space-4);
  }
}

@media (min-width: 48rem) and (max-width: 63.99rem) {
  .site-header__dropdown-trigger {
    font-size: var(--font-size-xs);
  }
}