/* App layout - minimal CSS, most styling via Tailwind */
.app-shell {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
  overflow: hidden;
  background:
    radial-gradient(58rem 35rem at 82% -16%, var(--guanghu-aurora), transparent 62%),
    radial-gradient(42rem 30rem at -12% 112%, var(--guanghu-glow), transparent 65%),
    var(--surface-app);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--border-primary) 82%, var(--accent-blue));
}

.app {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.app__sidebar {
  flex: 0 0 auto;
  min-width: 220px;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface-sidebar) 92%, var(--guanghu-glow)), var(--surface-sidebar));
}

.app__sidebar > * {
  flex: 1;
}

.app:has(.app__note-list) .app__sidebar > * {
  border-right-color: transparent;
}

.app__note-list {
  flex: 0 0 auto;
  min-width: 220px;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 20;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--surface-sidebar) 94%, var(--guanghu-glow)), var(--surface-sidebar));
  box-shadow: 14px 0 30px color-mix(in srgb, var(--surface-app) 60%, transparent);
}

.app__note-list > * {
  flex: 1;
  border-left: 1px solid var(--sidebar-border);
}

.app__editor {
  flex: 1;
  min-width: 480px;
  min-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  container-type: inline-size;
  container-name: editor;
  position: relative;
  background:
    linear-gradient(var(--guanghu-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--guanghu-grid) 1px, transparent 1px),
    color-mix(in srgb, var(--surface-editor) 94%, var(--guanghu-glow));
  background-size: 32px 32px, 32px 32px, auto;
}

.app__editor::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface-editor) 28%, transparent), transparent 13rem);
  z-index: 0;
}

.app__editor > * {
  position: relative;
  z-index: 1;
}

.app__editor > * {
  flex: 1;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes tab-status-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.tab-status-pulse {
  animation: tab-status-pulse 1.2s ease-in-out infinite;
}

/* AI highlight animation — applied by useAiActivity when MCP calls ui_highlight */
@keyframes ai-highlight-glow {
  0% { box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--accent-blue) 80%, transparent); }
  50% { box-shadow: inset 0 0 8px 2px color-mix(in srgb, var(--accent-blue) 40%, transparent); }
  100% { box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--accent-blue) 0%, transparent); }
}

.ai-highlight {
  animation: ai-highlight-glow 0.8s ease-out;
}