/* Auralis UI Toolkit - Strictly Governed Tokens */
:root {
  /* UI Colors */
  --ui-color-bg-primary: #070B14;
  --ui-color-bg-secondary: #0F172A;
  --ui-color-text-primary: #E2E8F0;
  --ui-color-text-secondary: #94A3B8;
  --ui-color-accent: #38BDF8;
  --ui-color-surface: #1E293B;
  --ui-color-border: rgba(255, 255, 255, 0.1);
  --ui-color-status-info: #0284c7;
  --ui-color-status-success: #10b981;
  --ui-color-status-warning: #f59e0b;
  --ui-color-status-error: #ef4444;

  /* UI Spacing */
  --ui-spacing-1: 4px;
  --ui-spacing-2: 8px;
  --ui-spacing-3: 16px;
  --ui-spacing-4: 24px;
  --ui-spacing-5: 32px;

  /* UI Font */
  --ui-font-family: system-ui, -apple-system, sans-serif;
  --ui-font-size-base: 14px;
  --ui-font-size-large: 18px;
  --ui-font-size-small: 12px;

  /* UI Z-Index */
  --ui-z-index-base: 1;
  --ui-z-index-header: 100;
  --ui-z-index-panel: 500;
  --ui-z-index-modal: 1000;
  --ui-z-index-toast: 2000;

  /* Component Layout Constants */
  --ui-layout-header-height: 64px;
  --ui-layout-panel-width: 420px;
  --ui-layout-sidebar-width: 320px;
  --ui-indent: 16px;
}

[data-theme="mono"] {
  --ui-color-bg-primary: #000000;
  --ui-color-bg-secondary: #111111;
  --ui-color-text-primary: #FFFFFF;
  --ui-color-text-secondary: #888888;
  --ui-color-accent: #FFFFFF;
  --ui-color-surface: #222222;
  --ui-color-border: #333333;
}

body {
  background: var(--ui-color-bg-primary);
  color: var(--ui-color-text-primary);
  margin: 0;
  font-family: var(--ui-font-family);
  font-size: var(--ui-font-size-base);
}

/* App Shell */
.auralis-app-shell {
  display: grid;
  grid-template-rows: var(--ui-layout-header-height) auto 1fr auto;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  background: var(--ui-color-bg-primary);
  color: var(--ui-color-text-primary);
}

.auralis-header {
  grid-row: 1;
  position: sticky;
  top: 0;
  z-index: var(--ui-z-index-header);
  background: var(--ui-color-bg-secondary);
  border-bottom: 1px solid var(--ui-color-border);
  box-sizing: border-box;
  padding: 0 var(--ui-spacing-4);
  display: flex;
  align-items: center;
}

.auralis-subheader {
  grid-row: 2;
  position: sticky;
  top: var(--ui-layout-header-height);
  z-index: var(--ui-z-index-header);
  background: var(--ui-color-surface);
  border-bottom: 1px solid var(--ui-color-border);
  box-sizing: border-box;
  padding: var(--ui-spacing-2) var(--ui-spacing-4);
}

.auralis-subheader:empty { display: none; }

.auralis-body {
  grid-row: 3;
  display: grid;
  grid-template-columns: var(--ui-layout-sidebar-width) 1fr;
  overflow: hidden;
  position: relative;
}

.auralis-sidebar {
  background: var(--ui-color-surface);
  border-right: 1px solid var(--ui-color-border);
  overflow-y: auto;
  box-sizing: border-box;
}

.auralis-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--ui-spacing-5);
  box-sizing: border-box;
  background: var(--ui-color-bg-primary);
}

.auralis-footer {
  grid-row: 4;
  position: sticky;
  bottom: 0;
  z-index: var(--ui-z-index-header);
  background: var(--ui-color-bg-secondary);
  border-top: 1px solid var(--ui-color-border);
  padding: var(--ui-spacing-3) var(--ui-spacing-4);
}

/* List */
.auralis-list {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--ui-color-border);
  border-radius: var(--ui-spacing-1);
  background: var(--ui-color-surface);
  overflow: hidden;
  user-select: none;
}

.auralis-list-empty {
  padding: var(--ui-spacing-5);
  text-align: center;
  color: var(--ui-color-text-secondary);
  font-style: italic;
}

.auralis-list-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--ui-spacing-2);
  padding: var(--ui-spacing-3) var(--ui-spacing-4);
  padding-left: calc(var(--ui-spacing-4) + (var(--aui-depth, 0) * var(--ui-indent)));
  border-bottom: 1px solid var(--ui-color-border);
  cursor: pointer;
  transition: background 0.1s ease;
  align-items: center;
  outline: none;
}

.auralis-list-row:focus-visible {
  background: var(--ui-color-bg-secondary);
  box-shadow: inset 0 0 0 2px var(--ui-color-accent);
}

.auralis-list-row:last-child { border-bottom: none; }
.auralis-list-row:hover { background: var(--ui-color-bg-secondary); }
.auralis-list-row.active {
  background: var(--ui-color-bg-primary);
  border-left: 4px solid var(--ui-color-accent);
  padding-left: calc(var(--ui-spacing-4) + (var(--aui-depth, 0) * var(--ui-indent)) - 4px);
}

/* Chevron Styles */
.auralis-list-chevron {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  color: var(--ui-color-text-secondary);
  transition: transform 0.2s ease;
  font-size: 10px;
  border-radius: 4px;
}

.auralis-list-chevron:hover {
  background: var(--ui-color-border);
  color: var(--ui-color-text-primary);
}

.auralis-list-chevron.is-expanded {
  transform: rotate(90deg);
}

.auralis-list-col-primary { font-weight: 600; color: var(--ui-color-text-primary); }
.auralis-list-col-secondary { color: var(--ui-color-text-secondary); font-size: var(--ui-font-size-small); text-align: right; }

/* Panel */
.auralis-panel-overlay {
  position: absolute; top: 0; right: 0; bottom: 0; left: 0;
  background: transparent; z-index: var(--ui-z-index-panel); pointer-events: none;
}
.auralis-panel-overlay.is-open { pointer-events: auto; }

.auralis-panel {
  position: absolute; top: 0; right: 0; bottom: 0; width: var(--ui-layout-panel-width);
  background: var(--ui-color-surface); border-left: 1px solid var(--ui-color-border);
  box-shadow: -4px 0 24px rgba(0,0,0,0.2); transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1); display: flex; flex-direction: column;
  z-index: calc(var(--ui-z-index-panel) + 1);
}
.auralis-panel.is-open { transform: translateX(0); }

.auralis-panel-header { padding: var(--ui-spacing-4); border-bottom: 1px solid var(--ui-color-border); display: flex; justify-content: space-between; align-items: center; }
.auralis-panel-title { margin: 0; font-size: var(--ui-font-size-large); font-weight: 600; }
.auralis-panel-close { background: transparent; border: none; color: var(--ui-color-text-secondary); cursor: pointer; padding: var(--ui-spacing-1); font-size: var(--ui-font-size-large); line-height: 1; }
.auralis-panel-close:hover { color: var(--ui-color-text-primary); }
.auralis-panel-content { flex: 1; overflow-y: auto; padding: var(--ui-spacing-4); }
.auralis-panel-footer { padding: var(--ui-spacing-4); border-top: 1px solid var(--ui-color-border); display: flex; justify-content: flex-end; gap: var(--ui-spacing-2); }