/**
 * Desirable Properties shared site header — reader + subpages.
 * Brand accent: gold (#d4af37). Background: deep navy/charcoal (#0d1117).
 */
:root,
[data-theme="dark"] {
  --dp-nav-bg: #0d1117;
  --dp-nav-surface: #161b22;
  --dp-nav-border: #30363d;
  --dp-nav-text: #e6edf3;
  --dp-nav-muted: #8b949e;
  --dp-nav-accent: #d4af37;
  --dp-nav-accent-hover: #e8c468;
  --nav-border: rgba(255, 255, 255, 0.08);
}

[data-theme="light"] {
  --dp-nav-bg: #f6f8fa;
  --dp-nav-surface: #ffffff;
  --dp-nav-border: #d0d7de;
  --dp-nav-text: #1f2328;
  --dp-nav-muted: #59636e;
  --dp-nav-accent: #b08d20;
  --dp-nav-accent-hover: #d4af37;
  --nav-border: rgba(0, 0, 0, 0.10);
}

body.dp-app-page {
  --bg: var(--dp-nav-bg);
  --card: var(--dp-nav-surface);
  --border: var(--dp-nav-border);
  --text: var(--dp-nav-text);
  --muted: var(--dp-nav-muted);
  --accent: var(--dp-nav-accent);
  --accent-hover: var(--dp-nav-accent-hover);
  --surface: var(--dp-nav-surface);
}

.dp-site-header {
  position: sticky;
  top: 0;
  z-index: 400;
  flex-shrink: 0;
  background: var(--surface, var(--dp-nav-surface));
  border-bottom: 1px solid var(--nav-border, var(--dp-nav-border));
  padding: 12px 0;
}

.dp-site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  width: 100%;
}

.dp-site-header-brand {
  min-width: 0;
  flex: 1 1 200px;
}

.dp-site-header-brand h1 {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--accent, var(--dp-nav-accent));
  line-height: 1.25;
  /* Allow wrap for longer titles (e.g. "The Desirable Properties of a Meta-Layer"). */
}

.dp-site-header-brand h1 a {
  color: inherit;
  text-decoration: none;
}

.dp-site-header-brand h1 a:hover {
  color: var(--dp-nav-accent-hover);
}

.dp-site-page-title {
  margin: 4px 0 0;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted, var(--dp-nav-muted));
}

.dp-site-header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  --header-control-h: 34px;
}

.dp-site-header-tools .dp-nav-signin {
  box-sizing: border-box;
  height: var(--header-control-h);
  min-height: var(--header-control-h);
  padding: 0 14px;
  border: 1px solid var(--accent, var(--dp-nav-accent));
  background: rgba(212, 175, 55, 0.12);
  color: var(--accent, var(--dp-nav-accent));
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  border-radius: 6px;
  font-family: inherit;
}

.dp-site-header-tools .dp-nav-signin:hover {
  filter: brightness(1.10);
}

.dp-site-header-tools .dp-nav-signin:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.dp-site-header-tools .theme-toggle {
  box-sizing: border-box;
  width: var(--header-control-h);
  height: var(--header-control-h);
  min-width: var(--header-control-h);
  min-height: var(--header-control-h);
  padding: 0;
  border: 1px solid var(--accent, var(--dp-nav-accent));
  background: transparent;
  color: var(--accent, var(--dp-nav-accent));
  cursor: pointer;
  font-size: 17px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  font-family: inherit;
}

.dp-site-header-tools .theme-toggle:hover {
  background: rgba(212, 175, 55, 0.18);
}

.dp-site-header-tools .toc-open-btn {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 6px;
  box-sizing: border-box;
  height: var(--header-control-h);
  min-height: var(--header-control-h);
  padding: 0 14px;
  border: 1px solid var(--accent, var(--dp-nav-accent));
  background: transparent;
  color: var(--accent, var(--dp-nav-accent));
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  border-radius: 6px;
  white-space: nowrap;
  font-family: inherit;
}

.dp-site-header-tools .toc-open-btn:hover {
  background: rgba(212, 175, 55, 0.18);
}

.dp-site-header-tools .toc-open-btn.is-visible {
  display: inline-flex;
}

/* Profile dropdown */
.dp-badge-wrapper {
  position: relative;
  z-index: 401;
  display: flex;
  align-items: center;
}

.dp-profile-cluster {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: var(--header-control-h);
  min-height: var(--header-control-h);
  padding: 0 10px 0 8px;
  margin: 0;
  border: 1px solid var(--accent, var(--dp-nav-accent));
  border-radius: 6px;
  background: rgba(212, 175, 55, 0.08);
  color: var(--accent, var(--dp-nav-accent));
  cursor: pointer;
  font: inherit;
  line-height: 1;
  transition: background 0.2s;
  position: relative;
  z-index: 1;
  pointer-events: auto;
}

.dp-profile-cluster:hover,
.dp-badge-wrapper.open .dp-profile-cluster {
  background: rgba(212, 175, 55, 0.18);
}

.dp-profile-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  flex-shrink: 0;
}

.dp-profile-chevron {
  font-size: 11px;
  line-height: 1;
  flex-shrink: 0;
  pointer-events: none;
}

.dp-badge-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  left: auto;
  min-width: 240px;
  max-width: min(320px, calc(100vw - 24px));
  --dp-dd-bg: var(--surface, var(--dp-nav-surface));
  --dp-dd-text: var(--text, var(--dp-nav-text));
  --dp-dd-muted: var(--muted, var(--dp-nav-muted));
  --dp-dd-accent: var(--accent, var(--dp-nav-accent));
  background: var(--dp-dd-bg);
  color: var(--dp-dd-text);
  border: 1px solid var(--nav-border, var(--dp-nav-border));
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
  padding: 0 0 8px;
  z-index: 220;
  display: none;
  pointer-events: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.dp-badge-wrapper.open .dp-badge-dropdown {
  display: block;
}

.dp-badge-wrapper.dp-dropdown-align-start .dp-badge-dropdown {
  left: 0;
  right: auto;
}

.dp-badge-wrapper.dp-dropdown-open-up .dp-badge-dropdown {
  top: auto;
  bottom: calc(100% + 4px);
}

.dp-badge-status {
  padding: 10px 12px 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--dp-dd-accent, var(--accent, var(--dp-nav-accent)));
  border-bottom: 1px solid var(--nav-border, var(--dp-nav-border));
  line-height: 1.35;
}

.dp-badge-dropdown .dp-menu-link {
  display: block;
  width: 100%;
  padding: 8px 12px;
  border: none;
  background: transparent;
  color: var(--dp-dd-text, var(--text, var(--dp-nav-text)));
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  text-decoration: none;
  box-sizing: border-box;
  font-family: inherit;
}

.dp-badge-dropdown .dp-menu-link:link,
.dp-badge-dropdown .dp-menu-link:visited {
  color: var(--dp-dd-text, var(--text, var(--dp-nav-text)));
}

.dp-badge-dropdown .dp-menu-link:hover,
.dp-badge-dropdown .dp-menu-link.is-active {
  background: rgba(212, 175, 55, 0.18);
  color: var(--dp-dd-accent, var(--accent, var(--dp-nav-accent)));
}

.dp-badge-dropdown .dp-menu-link[hidden] {
  display: none !important;
}

/* Mobile responsive header */
@media (max-width: 640px) {
  .dp-site-header {
    padding: 10px 0;
  }

  .dp-site-header-inner {
    gap: 10px;
  }

  .dp-site-header-brand h1 {
    font-size: 0.88rem;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: normal;
    overflow-wrap: anywhere;
  }

  .dp-site-header-tools {
    --header-control-h: 44px;
    width: 100%;
    justify-content: flex-end;
  }

  .dp-site-header-tools .dp-nav-signin,
  .dp-site-header-tools .toc-open-btn {
    font-size: 12px;
    padding: 0 12px;
  }

  .dp-profile-cluster {
    min-height: 44px;
    padding: 0 12px 0 10px;
  }

  .dp-badge-dropdown .dp-menu-link {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding-top: 10px;
    padding-bottom: 10px;
  }
}