/* Site shell: shared header, navigation and project-entry surfaces. */
html.has-modal-open,
html.has-mobile-menu-open {
  overflow: hidden;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(246, 245, 241, 0.985);
  border-bottom: 1px solid transparent;
  transition:
    background-color var(--motion-fast) var(--ease-ui),
    border-color var(--motion-fast) var(--ease-ui);
}

.site-header.is-scrolled {
  background: rgba(246, 245, 241, 0.96);
  border-bottom-color: var(--color-line);
}

.site-header__inner {
  min-height: var(--header-height);
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-6);
  align-items: center;
}

.site-wordmark {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-min);
  color: var(--color-ink);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.045em;
  text-decoration: none;
}

.site-nav {
  justify-self: end;
}

.site-nav__list,
.site-header__utility,
.language-switch {
  display: flex;
  align-items: center;
}

.site-nav__list {
  gap: clamp(1.1rem, 1.9vw, 2rem);
  list-style: none;
}

.site-nav__link,
.nav-dropdown__summary,
.mobile-menu__sub-link,
.language-switch__link,
.language-switch__current,
.mobile-menu__link,
.mobile-menu__learn-summary,
.mobile-menu__utility-link {
  color: var(--color-ink);
  font-size: var(--font-size-xs);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.025em;
  text-decoration: none;
}

.site-nav__link,
.nav-dropdown__summary {
  position: relative;
  min-height: var(--touch-min);
  display: inline-flex;
  align-items: center;
}

.site-nav__link::after,
.nav-dropdown__summary::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.55rem;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--motion-fast) var(--ease-ui);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after,
.nav-dropdown[open] > .nav-dropdown__summary::after,
.nav-dropdown__summary:hover::after,
.nav-dropdown__summary:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-header__utility {
  justify-self: end;
  gap: var(--space-4);
}

.language-switch {
  gap: 0.45rem;
  min-height: var(--touch-min);
  color: var(--color-text-secondary);
}

.language-switch__current {
  color: var(--color-ink);
}

.language-switch__link {
  color: var(--color-text-secondary);
}

.language-switch__link:hover,
.language-switch__link:focus-visible {
  color: var(--color-ink);
}

.button--header {
  min-height: 2.625rem;
  padding-inline: 1rem;
  font-size: var(--font-size-xs);
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown__summary {
  gap: 0.42rem;
  list-style: none;
  cursor: pointer;
}

.nav-dropdown__summary::-webkit-details-marker {
  display: none;
}

.nav-dropdown__chevron {
  display: inline-block;
  font-size: 0.75rem;
  transform: translateY(-0.03rem);
  transition: transform var(--motion-fast) var(--ease-ui);
}

.nav-dropdown[open] .nav-dropdown__chevron {
  transform: rotate(180deg) translateY(0.03rem);
}

.nav-dropdown__panel {
  position: absolute;
  top: calc(100% + 0.15rem);
  right: -1rem;
  width: min(22rem, 80vw);
  padding: var(--space-3) 1rem 1rem;
  border: 1px solid var(--color-line);
  background: var(--color-paper);
}

.nav-dropdown__item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-4);
  align-items: start;
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-line);
  text-decoration: none;
}

.nav-dropdown__item:last-child {
  border-bottom: 0;
}

.nav-dropdown__item-title {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1.3;
}

.nav-dropdown__item-copy {
  display: block;
  margin-top: var(--space-1);
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  line-height: 1.4;
}

.nav-dropdown__item-arrow {
  margin-top: 0.05rem;
  transition: transform var(--motion-fast) var(--ease-ui);
}

.nav-dropdown__item:hover .nav-dropdown__item-arrow,
.nav-dropdown__item:focus-visible .nav-dropdown__item-arrow {
  transform: translateX(0.18rem);
}

.mobile-menu-trigger {
  display: none;
  min-width: var(--touch-min);
  min-height: var(--touch-min);
  align-items: center;
  justify-content: flex-end;
  padding: 0;
  background: transparent;
  color: var(--color-ink);
  font-size: var(--font-size-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
}

.mobile-menu {
  width: 100vw;
  height: 100dvh;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.mobile-menu::backdrop {
  background: var(--color-paper);
}

.mobile-menu__inner {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 0 var(--page-gutter) var(--space-6);
}

.mobile-menu__top {
  min-height: 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-line);
}

.mobile-menu__close {
  min-width: var(--touch-min);
  min-height: var(--touch-min);
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0;
  background: transparent;
  color: var(--color-ink);
  font-size: var(--font-size-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
}

.mobile-menu__nav {
  padding-block: clamp(2.5rem, 8vh, 4.5rem);
}

.mobile-menu__list {
  list-style: none;
}

.mobile-menu__item {
  border-bottom: 1px solid var(--color-line);
}

.mobile-menu__link,
.mobile-menu__learn-summary {
  width: 100%;
  min-height: 4.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0;
  font-size: clamp(1.8rem, 8vw, 2.6rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.035em;
}

.mobile-menu__learn-summary {
  list-style: none;
  cursor: pointer;
}

.mobile-menu__learn-summary::-webkit-details-marker {
  display: none;
}

.mobile-menu__learn-icon {
  font-size: 1.15rem;
  font-weight: 400;
}

.mobile-menu__learn[open] .mobile-menu__learn-icon::before {
  content: "−";
}

.mobile-menu__learn:not([open]) .mobile-menu__learn-icon::before {
  content: "+";
}

.mobile-menu__sub-list {
  list-style: none;
  padding: 0 0 var(--space-5) var(--space-4);
}

.mobile-menu__sub-link {
  min-height: var(--touch-min);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  border-top: 1px solid var(--color-line);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.mobile-menu__bottom {
  margin-top: auto;
  display: grid;
  gap: var(--space-5);
}

.mobile-menu__start {
  width: 100%;
}

.mobile-menu__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-line);
}

.mobile-menu__utility-link {
  min-height: var(--touch-min);
  display: inline-flex;
  align-items: center;
}

.start-project-dialog .ui-dialog__body {
  display: grid;
  gap: 0;
}

.start-project-dialog__intro {
  margin-bottom: var(--space-7);
}

.start-project-choice {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-5);
  align-items: start;
  padding-block: var(--space-6);
  border-top: 1px solid var(--color-line);
  text-decoration: none;
}

.start-project-choice:last-child {
  border-bottom: 1px solid var(--color-line);
}

.start-project-choice__title {
  display: block;
  font-size: clamp(1.65rem, 2.8vw, 2.35rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.035em;
}

.start-project-choice__copy {
  display: block;
  max-width: 30rem;
  margin-top: var(--space-3);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.45;
}

.start-project-choice__arrow {
  font-size: 1.2rem;
  transition: transform var(--motion-fast) var(--ease-ui);
}

.start-project-choice:hover .start-project-choice__arrow,
.start-project-choice:focus-visible .start-project-choice__arrow {
  transform: translateX(0.2rem);
}

@media (max-width: 56.1875rem) {
  .site-header__inner {
    min-height: 4rem;
    grid-template-columns: auto 1fr auto;
    gap: var(--space-4);
  }

  .site-nav,
  .site-header__utility {
    display: none;
  }

  .mobile-menu-trigger {
    display: inline-flex;
    grid-column: 3;
    justify-self: end;
  }
}

@media (max-width: 37.4375rem) {
  .site-wordmark {
    font-size: 1.375rem;
  }

  .start-project-choice {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header,
  .nav-dropdown__chevron,
  .nav-dropdown__item-arrow,
  .start-project-choice__arrow {
    transition: none;
  }
}

/* Phase 4H: Learn dropdown can open an in-page dialog without changing visual language. */
.nav-dropdown__item--button,
.mobile-menu__sub-link--button {
  width: 100%;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

@media (pointer: coarse) {
  .mobile-menu .language-switch__link,
  .mobile-menu__utility-link {
    min-height: var(--touch-min);
    display: inline-flex;
    align-items: center;
  }

  .mobile-menu .language-switch__link {
    min-width: var(--touch-min);
    justify-content: center;
  }
}

/* Home architecture V3: button variants used by in-page enquiry flow. */
button.start-project-choice {
  width: 100%;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}
.quick-enquiry-dialog .ui-dialog__body {
  overflow-y: auto;
}
.quick-enquiry-dialog .contact-form {
  margin-top: var(--space-6);
}