/* Shared header used by the generated root page and every work page. */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--site-header-height);
  padding: 0 2rem;
  background-color: var(--header-bg);
  color: var(--header-text);
  transition:
    background-color var(--theme-transition-duration) var(--theme-transition-easing),
    color var(--theme-transition-duration) var(--theme-transition-easing);
}

.site-header-breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: var(--serif, 'EB Garamond', Georgia, serif);
  font-size: 0.94rem;
  line-height: 1.35;
  letter-spacing: 0.12em;
  color: var(--header-muted);
  text-transform: lowercase;
  white-space: nowrap;
  transition: color var(--theme-transition-duration) var(--theme-transition-easing);
}

.site-header-breadcrumb a {
  color: inherit;
  text-decoration: none;
  transition: color var(--theme-transition-duration) var(--theme-transition-easing);
}

.site-header-breadcrumb a:hover,
.site-header-current {
  color: var(--header-text);
}

.site-header-separator {
  color: var(--header-muted);
}

.site-header-brand {
  text-transform: lowercase;
  white-space: nowrap;
}

.site-header-actions,
.site-header-socials,
.site-header-social-link {
  display: inline-flex;
  align-items: center;
}

.site-header-actions {
  justify-content: flex-end;
  gap: 0.7rem;
  margin-left: 1rem;
  flex: 0 0 auto;
}

.site-header-socials {
  gap: 0.45rem;
}

.site-header-social-link {
  justify-content: center;
  width: 1.85rem;
  height: 2.25rem;
  color: var(--header-muted);
  text-decoration: none;
  transition: color var(--theme-transition-duration) var(--theme-transition-easing);
}

.site-header-social-link:hover,
.site-header-social-link:focus-visible {
  color: var(--header-text);
}

.site-header-social-link:focus-visible {
  outline: 1px solid currentColor;
  outline-offset: 0.1rem;
}

.site-header-social-icon {
  width: 1rem;
  height: 1rem;
  flex: 0 0 auto;
}

.theme-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  margin-left: 0;
  border: 0;
  background: transparent;
  color: var(--header-text);
  cursor: pointer;
  flex: 0 0 auto;
  perspective: 36rem;
  transition: color var(--theme-transition-duration) var(--theme-transition-easing);
}

.theme-toggle-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1.15rem;
  height: 1.15rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.55;
  stroke-linecap: round;
  stroke-linejoin: round;
  backface-visibility: hidden;
  transition:
    opacity var(--theme-icon-fade-duration) ease,
    transform var(--theme-icon-flip-duration) var(--theme-transition-easing);
}

.theme-toggle-icon--moon {
  opacity: 1;
  transform: translate(-50%, -50%) rotateY(0deg) scale(1);
}

.theme-toggle-icon--sun {
  opacity: 0;
  transform: translate(-50%, -50%) rotateY(-180deg) scale(0.86);
}

.theme-toggle:hover .theme-toggle-icon--moon,
:root[data-theme="light"] .theme-toggle-icon--moon {
  opacity: 0;
  transform: translate(-50%, -50%) rotateY(180deg) scale(0.86);
}

.theme-toggle:hover .theme-toggle-icon--sun,
:root[data-theme="light"] .theme-toggle-icon--sun {
  opacity: 1;
  transform: translate(-50%, -50%) rotateY(0deg) scale(1);
}

:root[data-theme="light"] .theme-toggle:hover .theme-toggle-icon--moon {
  opacity: 1;
  transform: translate(-50%, -50%) rotateY(0deg) scale(1);
}

:root[data-theme="light"] .theme-toggle:hover .theme-toggle-icon--sun {
  opacity: 0;
  transform: translate(-50%, -50%) rotateY(-180deg) scale(0.86);
}

.theme-toggle:focus-visible {
  outline: 1px solid currentColor;
  outline-offset: 0.2rem;
}

.language-menu {
  --language-menu-pad-x: 0.42rem;
  position: relative;
  flex: 0 0 auto;
}

.language-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.28rem;
  min-width: 2.35rem;
  height: 2.25rem;
  border: 0;
  background: transparent;
  color: var(--header-text);
  cursor: pointer;
  font-family: var(--serif, 'EB Garamond', Georgia, serif);
  font-size: 0.78rem;
  line-height: 1;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: color var(--theme-transition-duration) var(--theme-transition-easing);
}

.language-toggle-chevron {
  position: relative;
  width: 0.7rem;
  height: 0.7rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 0.24s ease;
}

.language-menu.is-open .language-toggle-chevron {
  transform: rotate(180deg);
}

.language-menu-list {
  position: absolute;
  top: 100%;
  left: calc(-1 * var(--language-menu-pad-x));
  z-index: 40;
  display: block;
  min-width: calc(2.35rem + var(--language-menu-pad-x) + var(--language-menu-pad-x));
  padding: 0 var(--language-menu-pad-x);
  border: 0;
  background: var(--header-bg);
  box-shadow: none;
  opacity: 0;
  pointer-events: none;
  transform: scaleY(0.72);
  transform-origin: top;
  clip-path: inset(0 0 100% 0);
  transition:
    background-color var(--theme-transition-duration) var(--theme-transition-easing),
    clip-path 0.24s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.18s ease,
    transform 0.24s cubic-bezier(0.22, 1, 0.36, 1);
}

.language-menu.is-open .language-menu-list {
  opacity: 1;
  pointer-events: auto;
  transform: scaleY(1);
  clip-path: inset(0 0 0 0);
}

.language-option {
  display: flex;
  align-items: center;
  width: 100%;
  height: 2.25rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--header-muted);
  cursor: pointer;
  font-family: var(--serif, 'EB Garamond', Georgia, serif);
  font-size: 0.78rem;
  line-height: 1;
  letter-spacing: 0.12em;
  text-align: left;
  text-transform: uppercase;
  transition: color var(--theme-transition-duration) var(--theme-transition-easing);
}

.language-option[hidden] {
  display: none !important;
}

.language-option:hover,
.language-option:focus-visible,
.language-option[aria-selected="true"] {
  color: var(--header-text);
}

.language-toggle:focus-visible,
.language-option:focus-visible {
  outline: 1px solid currentColor;
  outline-offset: 0.15rem;
}

[data-language-content] {
  display: none !important;
}

:root:not([data-language="cn"]):not([data-language="es"]) [data-language-content="en"],
:root[data-language="cn"] [data-language-content="cn"],
:root[data-language="es"] [data-language-content="es"] {
  display: revert !important;
}

@media (prefers-reduced-motion: reduce) {
  .theme-toggle-icon,
  .language-toggle-chevron {
    transition: none;
  }

  .language-menu-list {
    transform: none;
    clip-path: none;
    transition: none;
  }
}

@media (max-width: 900px) {
  .site-header {
    padding: 0 1rem;
  }

  .site-header-actions {
    gap: 0.45rem;
    margin-left: 0.75rem;
  }

  .site-header-socials {
    gap: 0.2rem;
  }

  .site-header-social-link {
    width: 1.65rem;
  }

  .language-toggle {
    font-size: 0.72rem;
  }

}

@media (max-width: 700px) {
  .site-header {
    padding: 0 0.85rem;
  }

  .site-header-breadcrumb {
    gap: 0.32rem;
    font-size: 0.78rem;
    letter-spacing: 0.09em;
  }

  .site-header-actions {
    gap: 0.3rem;
    margin-left: 0.45rem;
  }

  .site-header-social-link {
    width: 1.35rem;
  }

  .site-header-social-icon {
    width: 0.85rem;
    height: 0.85rem;
  }

  .theme-toggle {
    width: 1.9rem;
  }

  .theme-toggle-icon {
    width: 1rem;
    height: 1rem;
  }

  .language-menu {
    --language-menu-pad-x: 0.28rem;
  }

  .language-toggle {
    min-width: 2.1rem;
    font-size: 0.68rem;
    letter-spacing: 0.09em;
  }
}

@media (max-width: 430px) {
  .site-header-socials {
    display: none;
  }

  .site-header-breadcrumb {
    font-size: 0.76rem;
  }

  .site-header-actions {
    margin-left: 0.35rem;
  }
}