@view-transition {
  navigation: auto;
}

header {
  view-transition-name: aih-site-header;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Helvetica Neue", Arial, sans-serif !important;
}

header nav {
  padding: 16px 24px !important;
  gap: 16px !important;
}

header .logo {
  gap: 12px !important;
  font-size: 18px !important;
  line-height: 1.2 !important;
}

header .logo img {
  width: 42px !important;
  height: 42px !important;
}

header .nav-links {
  gap: 16px !important;
}

header .nav-links a {
  min-height: 36px;
  padding: 8px 10px !important;
  display: inline-flex;
  align-items: center;
  font-size: 14px !important;
  line-height: 20px;
  white-space: nowrap;
}

::view-transition-group(root) {
  animation-duration: 240ms;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

::view-transition-old(root) {
  animation: 110ms ease-out both aih-page-out;
}

::view-transition-new(root) {
  animation: 240ms cubic-bezier(0.22, 1, 0.36, 1) both aih-page-in;
}

::view-transition-group(aih-site-header) {
  animation-duration: 180ms;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

::view-transition-old(aih-site-header),
::view-transition-new(aih-site-header) {
  animation: none;
  mix-blend-mode: normal;
}

@keyframes aih-page-out {
  to { opacity: 0.92; }
}

@keyframes aih-page-in {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

.nav-links a,
.nav-menu-button {
  -webkit-tap-highlight-color: transparent;
}

.nav-links a[aria-current="page"] {
  background: var(--accent-soft, #e8f1ff);
  color: var(--text-main, #0b0c12);
}

.nav-links a:focus-visible,
.nav-menu-button:focus-visible {
  outline: 2px solid var(--accent, #0071e3);
  outline-offset: 3px;
}

.nav-menu {
  position: relative;
}

.nav-menu-button {
  appearance: none;
  border: 1px solid var(--border, #d9dde7);
  background: var(--surface, #ffffff);
  color: var(--text-main, #0b0c12);
  border-radius: 14px;
  min-height: 40px;
  padding: 8px 12px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: 0.2s ease;
  box-shadow: 0 12px 30px rgba(0, 16, 46, 0.06);
}

.nav-menu-button:hover,
.nav-menu.is-open .nav-menu-button {
  background: var(--accent-soft, #e8f1ff);
}

.nav-menu-button.primary {
  border-color: transparent;
  background: linear-gradient(135deg, #0071e3, #4c9fff);
  color: #ffffff;
  box-shadow: 0 12px 32px rgba(0, 113, 227, 0.22);
}

.nav-menu-button.primary:hover,
.nav-menu.is-open .nav-menu-button.primary {
  background: linear-gradient(135deg, #0071e3, #4c9fff);
}

.nav-menu-button::after {
  content: '';
  width: 8px;
  height: 8px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  opacity: 0.65;
  transition: 0.18s ease;
}

.nav-menu.is-open .nav-menu-button::after {
  transform: rotate(-135deg) translateY(-1px);
}

.nav-menu-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.nav-menu-title {
  font-size: 13px;
  font-weight: 700;
}

.nav-menu-meta {
  font-size: 11px;
  color: var(--text-dim, #4d5363);
  white-space: nowrap;
}

.nav-menu-button.primary .nav-menu-meta {
  color: rgba(255, 255, 255, 0.78);
}

.nav-menu-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: min(300px, calc(100vw - 36px));
  padding: 14px;
  border-radius: 18px;
  border: 1px solid var(--border, #d9dde7);
  background:
    radial-gradient(220px 120px at 0% 0%, rgba(0, 113, 227, 0.08), transparent 70%),
    var(--surface, #ffffff);
  box-shadow: 0 20px 60px rgba(0, 16, 46, 0.14);
  display: grid;
  gap: 14px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: 0.18s ease;
  z-index: 40;
}

.nav-menu.is-open .nav-menu-panel {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.menu-note {
  display: grid;
  gap: 5px;
}

.menu-note strong {
  font-size: 14px;
}

.menu-note span {
  font-size: 12px;
  color: var(--text-dim, #4d5363);
  line-height: 1.5;
}

.menu-section {
  display: grid;
  gap: 10px;
}

.menu-section-label {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim, #4d5363);
}

.appearance-menu-panel .lang-toggle,
.appearance-menu-panel .theme-toggle {
  width: 100%;
  display: inline-flex;
  box-shadow: none;
}

.appearance-menu-panel .lang-toggle button,
.appearance-menu-panel .theme-toggle button {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.auth-controls {
  display: inline-flex;
  align-items: center;
}

.auth-link,
.auth-action {
  appearance: none;
  border: 1px solid var(--border, #d9dde7);
  background: var(--surface, #ffffff);
  color: var(--text-main, #0b0c12);
  text-decoration: none;
  padding: 11px 12px;
  border-radius: 14px;
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.auth-link:hover,
.auth-action:hover {
  background: var(--accent-soft, #e8f1ff);
}

.auth-link.primary,
.auth-action.primary {
  border-color: transparent;
  background: linear-gradient(135deg, #0071e3, #4c9fff);
  color: #ffffff;
  box-shadow: 0 12px 32px rgba(0, 113, 227, 0.18);
}

.auth-summary {
  display: grid;
  gap: 6px;
  padding: 2px 2px 4px;
}

.auth-summary strong {
  font-size: 14px;
}

.auth-user {
  font-size: 12px;
  color: var(--text-dim, #4d5363);
  overflow-wrap: anywhere;
}

@media (max-width: 640px) {
  .nav-menu-panel {
    right: auto;
    left: 0;
    width: min(320px, calc(100vw - 32px));
  }

  .auth-menu-panel {
    right: 0;
    left: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(root),
  ::view-transition-group(aih-site-header) {
    animation-duration: 1ms;
  }

  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none;
  }
}