.site-header {
  background: #f3f4f6;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  /* Unified public header (kanban t_8e6362ec): pin the header to the sans
     token stack (Inter first, loaded site-wide via common.css) instead of
     inheriting the page-dependent body font — the landing body uses the
     Inter ramp while other pages use the legacy Helvetica brand stack. */
  font-family: var(--vp-font-family-sans, "Helvetica Neue", Helvetica, Arial, sans-serif);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-link img {
  height: 40px;
  width: auto;
  display: block;
}

.desktop-nav {
  display: none;
  align-items: center;
  gap: 24px;
}

@media (min-width: 768px) {
  .desktop-nav {
    display: flex;
  }
}

.desktop-nav a {
  font-size: 14px;
  font-weight: 500;
  color: #4b5563;
}

.desktop-nav a:hover,
.desktop-nav a.is-active {
  color: #111827;
}

.tooltip-wrapper {
  position: relative;
  display: inline-flex;
}

.tooltip-box {
  position: absolute;
  z-index: 100;
  width: 288px;
  padding: 8px;
  color: var(--vp-color-text-inverse, #fff);
  background: #000;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.4;
  left: 50%;
  transform: translateX(-50%);
  top: 100%;
  margin-top: 4px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.tooltip-box::before {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  background: #000;
  transform: rotate(45deg);
  top: -4px;
  left: 50%;
  margin-left: -4px;
}

.tooltip-icon-wrapper {
  position: relative;
  display: inline-flex;
}

.tooltip-icon-wrapper:hover .tooltip-box {
  opacity: 1;
}

.dev-feedback-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: #4b5563;
  padding: 0;
  font-family: inherit;
  transition: color 0.2s ease;
}

.dev-feedback-btn:hover {
  color: #111827;
}

.dev-feedback-btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.burger {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--vp-radius-md, 8px);
  transition: background 0.2s ease;
}

.burger:hover {
  background: #e5e7eb;
}

@media (min-width: 768px) {
  .burger {
    display: none;
  }
}

.burger-icon {
  position: relative;
  width: 24px;
  height: 24px;
}

.burger span {
  display: block;
  position: absolute;
  height: 2px;
  width: 100%;
  background: #4b5563;
  border-radius: var(--vp-radius-full, 999px);
  transition: top 0.3s ease, bottom 0.3s ease, transform 0.3s ease, opacity 0.3s ease;
}

.burger span:nth-child(1) {
  top: 4px;
  left: 0;
}

.burger span:nth-child(2) {
  top: 50%;
  left: 0;
  transform: translateY(-50%);
}

.burger span:nth-child(3) {
  bottom: 4px;
  left: 0;
}

.burger.is-open span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.burger.is-open span:nth-child(2) {
  opacity: 0;
}

.burger.is-open span:nth-child(3) {
  bottom: auto;
  top: 50%;
  transform: translateY(-50%) rotate(-45deg);
}

.mobile-menu {
  display: flex;
  flex-direction: column;
  background: var(--vp-color-bg-surface, #fff);
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  height: calc(100dvh - 64px);
  z-index: 50;
  overflow-y: auto;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  opacity: 0;
  transform: translateY(-16px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
  visibility: hidden;
}

.mobile-menu[hidden] {
  display: none !important;
}

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

.mobile-menu-body {
  padding: 32px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  flex: 1;
}

.mobile-menu a {
  font-size: 18px;
  font-weight: 500;
  color: #111827;
  display: block;
}

.mobile-menu a:hover,
.mobile-menu a.is-active {
  color: var(--vp-color-action-primary, #003677);
}

.mobile-menu-dev-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 18px;
  font-weight: 500;
  color: #111827;
  font-family: inherit;
  padding: 0;
}

.mobile-menu-dev-btn:hover {
  color: var(--vp-color-action-primary, #003677);
}

.mobile-menu-dev-btn .shared-question-tooltip-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.mobile-menu-footer {
  padding: 24px 16px;
  border-top: 1px solid #f3f4f6;
  text-align: center;
  font-size: 14px;
  color: #6b7280;
  margin-top: auto;
}