/* Top bar: brand, story switcher, work-mode tabs, save status, history, diagnostics, export,
   files; plus the shared popup menu styles. */
.topbar {
  position: relative;
  z-index: var(--z-topbar);
  flex: none;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  gap: var(--space-7);
  padding: 0 var(--space-7) 0 var(--space-8);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  flex: none;
}
.brand picture {
  display: contents;
}
.brand-mark {
  width: 28px;
  height: 28px;
  display: block;
}
.brand-name {
  font: 700 var(--font-size-xl)/1 var(--font-serif);
  letter-spacing: var(--fp-tracking-zh-wordmark);
}
.topbar-divider {
  flex: none;
  width: 1px;
  height: 24px;
  background: var(--color-border);
}
.topbar-spacer {
  flex: 1 1 0;
  min-width: 0;
}
#app[data-library="false"] .needs-library,
#app[data-empty="true"] .needs-story {
  display: none !important;
}

/* Story switcher */
.menu-anchor {
  position: relative;
  flex: none;
  min-width: 0;
}
.story-switcher-anchor {
  flex: 0 1 auto;
}
.story-switcher {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  max-width: 100%;
  height: var(--control-height);
  padding: 0 var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}
.story-switcher:hover,
.story-switcher[aria-expanded="true"] {
  background: var(--color-hover);
}
.story-switcher-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font: 700 var(--font-size-md)/1.2 var(--font-serif);
}
.story-switcher-meta {
  flex: none;
  color: var(--color-text-muted);
  font: var(--font-size-xs) var(--font-mono);
  white-space: nowrap;
}
.story-switcher .chevron {
  width: 16px;
  height: 16px;
  color: var(--color-text-muted);
}

/* Popup menus */
.menu {
  position: absolute;
  z-index: var(--z-menu);
  top: calc(100% + 6px);
  left: 0;
  min-width: 220px;
  max-width: min(380px, calc(100vw - 24px));
  max-height: min(70dvh, 520px);
  overflow: auto;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-menu);
}
.menu-end {
  left: auto;
  right: 0;
}
.menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  width: 100%;
  min-height: var(--touch-target);
  padding: 0 var(--space-5);
  border-radius: var(--radius-sm);
  text-align: left;
  color: var(--color-text);
  white-space: nowrap;
}
.menu-item .icon {
  width: 16px;
  height: 16px;
  color: var(--color-text-2);
}
.menu-item:hover:not(:disabled),
.menu-item:focus-visible {
  background: var(--color-hover);
}
.menu-item:focus-visible {
  outline-offset: -2px;
}
.menu-separator {
  height: 1px;
  margin: var(--space-3) var(--space-2);
  background: var(--color-border);
}
.story-menu {
  width: 340px;
}
.story-menu-items:empty {
  display: none;
}
.story-menu-items:empty + .menu-separator {
  display: none;
}
.story-menu-row {
  display: flex;
  align-items: stretch;
  gap: var(--space-1);
  border-radius: var(--radius-sm);
}
.story-menu-row.active {
  background: var(--color-accent-tint);
}
.story-menu-item {
  flex: 1;
  min-width: 0;
  padding-block: var(--space-3);
}
.story-menu-item .icon {
  visibility: hidden;
  color: var(--color-accent-text);
}
.story-menu-item[aria-checked="true"] .icon {
  visibility: visible;
}
.story-menu-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.story-menu-title {
  overflow: hidden;
  text-overflow: ellipsis;
  font: 700 var(--font-size-base)/1.35 var(--font-serif);
}
.story-menu-meta {
  color: var(--color-text-muted);
  font: var(--font-size-xs)/1.4 var(--font-mono);
}
.story-menu-remove {
  flex: none;
  width: var(--touch-target);
  justify-content: center;
  padding: 0;
}
.story-menu-remove:hover .icon,
.story-menu-remove:focus-visible .icon {
  color: var(--color-attention);
}

/* Mode tabs */
.mode-tabs {
  flex: none;
}

/* Save status: icon only (distinct glyph per state); the wording is its name and tooltip. */
.save-state {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 32px;
  height: var(--control-height);
  color: var(--color-text-muted);
}
.save-state .icon {
  width: 18px;
  height: 18px;
}
.save-state[data-tone="saved"] {
  color: var(--color-positive);
}
.save-state[data-tone="error"] {
  color: var(--color-attention);
}
.history {
  display: flex;
  gap: var(--space-2);
  flex: none;
}

/* Diagnostics button */
.diagnostics-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  flex: none;
  height: var(--control-height);
  padding: 0 var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  white-space: nowrap;
}
.diagnostics-button .icon {
  width: 16px;
  height: 16px;
}
.diagnostics-button[data-tone="ok"] {
  border-color: var(--color-positive-border);
  color: var(--color-positive);
}
.diagnostics-button[data-tone="error"],
.diagnostics-button[data-tone="warning"] {
  border-color: var(--color-accent-ring);
  color: var(--color-attention);
}
.diagnostics-button:hover,
.diagnostics-button[aria-expanded="true"] {
  background: var(--color-hover);
}
.diagnostics-count {
  display: none;
}
.export-button {
  flex: none;
}