/* Navigation dropdown & search panel */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--color-white);
}

.nav-item {
  position: static;
}

.nav-link {
  font-size: 16px;
  font-weight: 400;
  color: var(--color-heading);
  padding: 10px 16px 32px;
  margin-top: 22px;
  position: relative;
  transition: color var(--transition);
}

.nav-link:hover,
.nav-link[aria-expanded="true"] {
  color: var(--color-primary);
}

.nav-link[aria-expanded="true"]::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 3px;
  height: 6px;
  border-radius: 2px;
  background: var(--color-primary);
  z-index: 210;
}

.nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--header-height);
  background: rgba(0, 0, 0, 0.3);
  z-index: 150;
}

.nav-backdrop.visible {
  display: block;
}

/* Full-width mega panel (matches gehealthcare.cn) */
.nav-mega-panel {
  display: none;
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: 160;
}

.nav-mega-panel.open {
  display: block;
}

.mega-panel-bg {
  background: linear-gradient(270deg, #fbf9fd 50%, #ffffff 0);
  min-height: 400px;
  width: 100%;
  overflow-y: auto;
}

.mega-panel-inner {
  display: flex;
  flex-direction: row;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
  min-height: 400px;
}

.mega-sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 318px;
  flex-shrink: 0;
  background: #ffffff;
  padding: 41px 34px 41px 0;
  border-right: 1px solid #f0edf5;
}

.mega-cat-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  font-size: 16px;
  font-weight: 400;
  line-height: 24px;
  color: #222222;
  text-align: left;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
  transition: color var(--transition);
}

.mega-cat-btn:hover,
.mega-cat-btn.active {
  color: var(--color-primary);
}

.mega-cat-btn:hover .mega-cat-icon path,
.mega-cat-btn.active .mega-cat-icon path {
  fill: var(--color-primary);
}

.mega-cat-icon {
  flex-shrink: 0;
  margin-left: 8px;
}

.mega-cat-icon path {
  fill: #222222;
  transition: fill var(--transition);
}

.mega-direct-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  font-size: 16px;
  font-weight: 400;
  line-height: 24px;
  color: #222222;
  text-decoration: none;
  padding: 0;
  transition: color var(--transition);
}

.mega-direct-link:hover {
  color: var(--color-primary);
}

.mega-direct-link:hover .mega-cat-icon path {
  fill: var(--color-primary);
}

.mega-content {
  flex: 1;
  padding: 41px 0 41px 48px;
  min-width: 0;
  background: #fbf9fd;
}

.mega-tertiary {
  display: none;
  flex-direction: column;
}

.mega-tertiary.active {
  display: flex;
}

.mega-tertiary a {
  display: block;
  font-size: 16px;
  font-weight: 400;
  line-height: 24px;
  color: #222222;
  text-decoration: none;
  padding: 0;
  margin-bottom: 16px;
  transition: color var(--transition);
}

.mega-tertiary a:hover {
  color: var(--color-primary);
}

.mega-view-all {
  margin-top: auto;
  padding-top: 24px;
}

.mega-view-all a {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.mega-view-all a:hover {
  text-decoration: underline;
}

/* Search overlay */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 120px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.search-overlay.open {
  opacity: 1;
  visibility: visible;
}

.search-panel {
  background: var(--color-white);
  border-radius: 12px;
  width: 90%;
  max-width: 720px;
  padding: 32px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
  transform: translateY(-20px);
  transition: transform 0.3s;
}

.search-overlay.open .search-panel {
  transform: translateY(0);
}

.search-panel-header {
  display: flex;
  gap: 16px;
  align-items: center;
}

.search-form {
  flex: 1;
  display: flex;
  align-items: center;
  border: 2px solid var(--color-gray-200);
  border-radius: 8px;
  padding: 4px 16px;
  transition: border-color var(--transition);
}

.search-form:focus-within {
  border-color: var(--color-primary);
}

.search-form input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 18px;
  padding: 12px 8px;
  font-family: inherit;
}

.search-submit {
  padding: 8px;
}

.search-close {
  width: 44px;
  height: 44px;
  font-size: 20px;
  color: var(--color-muted);
  border-radius: 8px;
  transition: background var(--transition);
}

.search-close:hover {
  background: var(--color-gray-100);
}

.search-suggestions {
  margin-top: 24px;
}

.search-hint {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.search-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.search-tags a {
  padding: 6px 16px;
  background: var(--color-gray-100);
  border-radius: 20px;
  font-size: 14px;
  color: var(--color-heading);
  transition: background var(--transition), color var(--transition);
}

.search-tags a:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

body.nav-open,
body.search-open,
body.mobile-nav-open {
  overflow: hidden;
}

/* Mobile drawer navigation */
.mobile-drawer {
  display: none;
}

.mobile-drawer-panel.hidden {
  display: none;
}

@media (max-width: 767px) {
  .site-header.mobile-menu-open {
    border-bottom: 1px solid var(--color-gray-200);
  }

  .mobile-drawer {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 190;
    background: #ffffff;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .mobile-drawer.open {
    display: block;
  }

  .mobile-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .mobile-nav-row {
    border-bottom: 1px solid #e8e8ed;
  }

  .mobile-nav-row--platform {
    padding: 16px 20px 8px;
    border-bottom: none;
  }

  .mobile-drawer-footer {
    padding: 16px 20px 28px;
    border-top: 1px solid #e8e8ed;
    background: #ffffff;
  }

  .lang-switch--mobile {
    display: block;
    width: 100%;
  }

  .lang-switch--mobile .lang-switch-btn {
    width: 100%;
    height: 48px;
    padding: 0 16px;
    justify-content: space-between;
    gap: 8px;
    border: 1px solid #e8e8ed;
    border-radius: 8px;
    background: #fafafa;
  }

  .lang-switch--mobile .lang-switch-label {
    flex: 1;
    text-align: left;
    font-size: 15px;
  }

  .lang-switch--mobile .lang-switch-menu {
    position: static;
    top: auto;
    right: auto;
    width: 100%;
    min-width: 0;
    max-height: min(50vh, 320px);
    margin-top: 8px;
    box-shadow: none;
    border: 1px solid #e8e8ed;
    border-radius: 8px;
  }

  .mobile-nav-platform-entry {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 44px;
    padding: 12px 16px;
    font-size: 16px;
    font-weight: 600;
    line-height: 24px;
    color: var(--color-primary);
    text-decoration: none;
    background: transparent;
    border: 1.5px solid var(--color-primary);
    border-radius: 4px;
    transition: background var(--transition), color var(--transition);
  }

  .mobile-nav-platform-entry:hover {
    background: var(--color-primary);
    color: var(--color-white);
  }

  .mobile-nav-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 20px 20px;
    font-size: 16px;
    line-height: 24px;
    color: #222222;
    text-decoration: none;
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: inherit;
    text-align: left;
  }

  .mobile-nav-item .mega-cat-icon {
    flex-shrink: 0;
  }

  .mobile-nav-item .mega-cat-icon path {
    fill: #222222;
  }

  .mobile-nav-back {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 16px 20px;
    font-size: 16px;
    font-weight: 600;
    color: var(--color-primary);
    border: none;
    border-bottom: 1px solid #e8e8ed;
    background: #ffffff;
    cursor: pointer;
    font-family: inherit;
    text-align: left;
  }

  .mobile-sub-content {
    padding: 8px 0 32px;
  }

  .mobile-nav-group {
    padding: 16px 20px 8px;
  }

  .mobile-nav-group-label {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-muted);
    margin-bottom: 12px;
    text-transform: none;
  }

  .mobile-nav-sublink {
    display: block;
    padding: 12px 0;
    font-size: 16px;
    line-height: 24px;
    color: #222222;
    text-decoration: none;
    border-bottom: 1px solid #f0f0f5;
  }

  .mobile-nav-sublink--solo {
    padding: 16px 20px;
    border-bottom: 1px solid #e8e8ed;
  }

  .mobile-nav-sublink:hover {
    color: var(--color-primary);
  }

  .icon-close[hidden],
  .icon-menu[hidden] {
    display: none;
  }

  .mobile-menu-btn .icon-close:not([hidden]),
  .mobile-menu-btn .icon-menu:not([hidden]) {
    display: block;
  }
}

@media (max-width: 767px) {
  .nav-mega-panel {
    position: static;
  }

  .mega-panel-bg {
    background: #ffffff;
    min-height: 0;
  }

  .mega-panel-inner {
    flex-direction: column;
    padding: 0 16px;
  }

  .mega-sidebar {
    width: 100%;
    padding: 16px 0;
  }

  .mega-content {
    padding-top: 0;
    padding-bottom: 16px;
    border-top: 1px solid var(--color-gray-200);
  }

  .nav-link[aria-expanded="true"]::after {
    display: none;
  }

  .search-overlay {
    padding-top: 80px;
  }
}