/* Shared header. Kept separate from legacy page and navbar rules. */
.skip-link {
  position: fixed; inset: 8px auto auto 16px; z-index: 1001;
  padding: 12px 18px; border-radius: 10px; background: var(--card-bg);
  color: var(--text-primary); transform: translateY(-160%);
}
.skip-link:focus { transform: none; }
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--card-bg); border-bottom: 1px solid var(--border-light);
  transition: box-shadow .15s;
}
.site-header.is-scrolled { box-shadow: var(--shadow-md); }
.site-nav {
  position: relative; max-width: 1216px; min-height: 76px; margin-inline: auto;
  padding: 10px 28px; display: grid; grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center; gap: 28px;
}
.site-nav > .brand { min-width: 0; }
.site-nav-menu { display: flex; align-items: center; gap: 20px; min-width: 0; }
.site-nav-links { display: flex; align-items: center; gap: 4px; min-width: 0; }
.site-nav-link {
  display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 10px 12px;
  border-radius: 10px; color: var(--text-secondary); font-size: 13px;
  font-weight: 600; white-space: nowrap; line-height: 1.5;
}
.site-nav-link:hover { background: var(--surface-muted); color: var(--text-primary); }
.site-nav-link.active, .site-nav-link[aria-current="page"] { background: var(--tint); color: var(--primary); }
.site-link-icon { display: none; }
.site-nav-auth { display: flex; gap: 8px; margin-left: auto; }
.site-nav-auth .btn { min-height: 44px; }
.site-nav-tools { display: flex; align-items: center; gap: 8px; min-width: 0; }
.site-icon-button {
  display: grid; place-items: center; width: 44px; min-width: 44px; height: 44px;
  padding: 0; border: 1px solid transparent; border-radius: 12px;
  background: transparent; color: var(--text-secondary); cursor: pointer;
}
.site-icon-button:hover { color: var(--text-primary); background: var(--surface-muted); }
.site-icon-button .icon { width: 21px; height: 21px; }
.site-nav-toggle, .site-theme-toggle, .theme-to-light, .nav-close-icon { display: none; }
.js .site-theme-toggle { display: grid; }
[data-theme="dark"] .theme-to-dark { display: none; }
[data-theme="dark"] .theme-to-light { display: block; }
.site-nav-toggle[aria-expanded="true"] { background: var(--tint); color: var(--primary); }
.site-nav-toggle[aria-expanded="true"] .nav-open-icon { display: none; }
.site-nav-toggle[aria-expanded="true"] .nav-close-icon { display: block; }
.site-account { position: relative; min-width: 0; }
.site-account-trigger {
  display: flex; align-items: center; gap: 9px; min-height: 44px; max-width: 176px;
  padding: 5px 9px; border: 1px solid var(--border-light); border-radius: 12px;
  background: var(--card-bg); color: var(--text-primary); cursor: pointer; list-style: none;
}
.site-account-trigger::-webkit-details-marker { display: none; }
.site-account-trigger:hover, .site-account[open] > summary { border-color: var(--primary); background: var(--tint); }
.site-account-label { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12px; font-weight: 650; }
.site-account-chevron { width: 16px; height: 16px; color: var(--text-muted); transition: transform .15s; }
.site-account[open] .site-account-chevron { transform: rotate(180deg); }
.site-account-panel {
  position: absolute; right: 0; top: calc(100% + 12px); width: 272px; z-index: 2;
  max-width: calc(100vw - 32px); max-height: calc(100vh - 104px); max-height: calc(100dvh - 104px);
  overflow-y: auto; overscroll-behavior: contain; padding: 8px;
  border: 1px solid var(--border-light); border-radius: 16px;
  background: var(--card-bg); box-shadow: var(--shadow-lg);
}
.site-account-identity { padding: 12px; margin-bottom: 6px; border-bottom: 1px solid var(--border-light); }
.site-account-identity strong { display: block; font-size: 13px; overflow-wrap: anywhere; line-height: 1.6; }
.site-account-identity > span { display: block; margin-top: 4px; color: var(--text-muted); font-size: 11px; }
.site-account-panel > a, .site-account-panel button {
  display: flex; align-items: center; gap: 10px; min-height: 44px; width: 100%; padding: 10px 12px;
  border: 0; border-radius: 9px; background: transparent; color: var(--text-secondary);
  font: inherit; font-size: 12px; text-align: left; cursor: pointer;
}
.site-account-panel > a:hover, .site-account-panel > a[aria-current="page"] { background: var(--surface-muted); color: var(--primary); }
.site-account-panel .icon { width: 18px; height: 18px; }
.site-account-panel form { padding-top: 6px; margin-top: 6px; border-top: 1px solid var(--border-light); }
.site-account-panel button { color: var(--danger); }
.site-account-panel button:hover { background: var(--surface-muted); }
.site-header :is(a, button, summary):focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; }
#main-content:focus { outline: none; }
@media (min-width: 961px) and (max-width: 1120px) {
  .site-nav { gap: 18px; padding-inline: 24px; }
  .site-nav-menu { gap: 12px; }
  .site-nav-link { padding-inline: 9px; }
  .site-account-trigger { max-width: 154px; }
}
@media (max-width: 960px) {
  .site-nav { grid-template-columns: minmax(0, 1fr) auto; min-height: 68px; padding: 12px 24px; gap: 12px; }
  .site-nav-tools { grid-column: 2; grid-row: 1; gap: 6px; }
  .site-nav-menu { grid-column: 1 / -1; grid-row: 2; flex-direction: column; align-items: stretch; gap: 12px; padding-block: 8px; }
  .site-nav-links { display: grid; gap: 4px; }
  .site-nav-link { padding: 12px; white-space: normal; }
  .site-link-icon { display: block; width: 19px; height: 19px; }
  .site-nav-auth { margin: 0; padding-top: 12px; border-top: 1px solid var(--border-light); }
  .site-nav-auth .btn { flex: 1; }
  .js .site-nav-toggle { display: grid; }
  .js .site-nav-menu {
    display: none; position: absolute; grid-area: auto;
    left: 16px; right: 16px; top: calc(100% + 8px);
    max-height: calc(100vh - 92px); max-height: calc(100dvh - 92px);
    overflow-y: auto; overscroll-behavior: contain; padding: 12px;
    border: 1px solid var(--border-light); border-radius: 16px;
    background: var(--card-bg); box-shadow: var(--shadow-lg);
  }
  .js .site-header[data-nav-open="true"] .site-nav-menu { display: flex; }
  .site-account { position: static; }
  .site-account-trigger { width: 44px; height: 44px; padding: 5px; justify-content: center; }
  .site-account-label, .site-account-chevron { display: none; }
  .site-account-panel { right: 16px; top: calc(100% + 8px); max-height: calc(100vh - 92px); max-height: calc(100dvh - 92px); }
}
@media (max-width: 640px) {
  .site-nav { min-height: 64px; padding: 10px 16px; gap: 8px; }
  .site-nav-tools { gap: 4px; }
  .site-nav .brand { gap: 7px; }
  .site-nav .brand-name { font-size: 21px; }
  .site-nav .brand-mark { width: 31px; height: 31px; }
}
@media (prefers-reduced-motion: reduce) {
  .site-header, .site-account-chevron { transition: none; }
}