/* Lab Shell — shared layout for all Studio > Labs pages.
   Depends on admin-tokens.css for all design tokens. */

.lab-page {
  display: grid;
  grid-template-columns: 280px 1fr;
  grid-template-rows: 1fr;
  height: 100%;
  gap: 0;
}

/* Sidebar panel — experiment list, metadata, parameters */
.lab-sidebar {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--s-color-border-subtle);
  background: var(--s-surface-elevation-1-bg);
  overflow-y: auto;
}

.lab-sidebar-section {
  padding: var(--s-space-4) var(--s-space-5);
  border-bottom: 1px solid var(--s-color-border-subtle);
}

.lab-sidebar-title {
  font-size: var(--s-font-size-0);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--s-color-fg-muted);
  margin-bottom: var(--s-space-3);
}

/* Experiment list items */
.lab-item {
  display: flex;
  align-items: center;
  gap: var(--s-space-3);
  padding: var(--s-space-3) var(--s-space-5);
  color: var(--s-color-fg-muted);
  font-size: var(--s-font-size-0);
  cursor: pointer;
  transition: color var(--s-duration-fast, 100ms) var(--s-ease-out),
              background var(--s-duration-fast, 100ms) var(--s-ease-out);
}

.lab-item:hover {
  color: var(--s-color-fg-primary);
  background: var(--s-color-hover-bg);
}

.lab-item[data-active="true"] {
  color: var(--s-color-prominent-bg);
  font-weight: 500;
  background: var(--s-color-active-bg);
}

.lab-item-badge {
  font-size: var(--s-font-size-min);
  color: var(--s-color-fg-soft);
  margin-left: auto;
  font-family: var(--s-font-mono);
}

/* Version strip — horizontal selector below experiment name */
.lab-versions {
  display: flex;
  gap: var(--s-space-2);
  padding: var(--s-space-3) var(--s-space-5);
}

.lab-version-btn {
  font-size: var(--s-font-size-min);
  font-family: var(--s-font-mono);
  padding: var(--s-space-2) var(--s-space-3);
  color: var(--s-color-fg-muted);
  background: var(--s-color-bg-subtle);
  border-radius: var(--s-radius-1);
  cursor: pointer;
  transition: color var(--s-duration-fast, 100ms) var(--s-ease-out),
              background var(--s-duration-fast, 100ms) var(--s-ease-out);
}

.lab-version-btn:hover {
  color: var(--s-color-fg-primary);
  background: var(--s-color-hover-bg);
}

.lab-version-btn[data-active="true"] {
  color: var(--s-color-prominent-fg);
  background: var(--s-color-prominent-bg);
  font-weight: 600;
}

/* Metadata display in sidebar */
.lab-meta {
  padding: var(--s-space-3) var(--s-space-5);
}

.lab-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--s-space-2) 0;
  font-size: var(--s-font-size-0);
}

.lab-meta-label {
  color: var(--s-color-fg-soft);
}

.lab-meta-value {
  color: var(--s-color-fg-primary);
  font-family: var(--s-font-mono);
  font-size: var(--s-font-size-min);
}

/* Main viewport — hosts the iframe or inline content */
.lab-viewport {
  position: relative;
  background: var(--s-color-bg-app);
  overflow: hidden;
}

.lab-viewport iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* Empty state when no experiment is selected */
.lab-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: var(--s-space-4);
  color: var(--s-color-fg-soft);
}

.lab-empty-icon {
  font-size: var(--s-font-size-8);
  opacity: 0.4;
}

.lab-empty p {
  font-size: var(--s-font-size-1);
  margin: 0;
}

/* Hidden utility — behavioral toggle for JS-managed visibility */
.lab-hidden {
  display: none;
}

/* Focus states */
.lab-item:focus-visible {
  outline: 2px solid var(--s-color-prominent-bg);
  outline-offset: -2px;
}

.lab-version-btn:focus-visible {
  outline: 2px solid var(--s-color-prominent-bg);
  outline-offset: -2px;
}

/* Shared content classes — used by lab page modules */
.lab-source-path {
  font-size: var(--s-font-size-min);
  color: var(--s-color-fg-soft);
  margin-top: var(--s-space-3);
  font-family: var(--s-font-mono);
}

.lab-viewport-title {
  font-size: var(--s-font-size-2);
  font-weight: 600;
  color: var(--s-color-fg-primary);
  margin: 0 0 var(--s-space-4) 0;
}

.lab-phase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--s-space-4);
}

.lab-phase-card {
  background: var(--s-surface-elevation-1-bg);
  border-radius: var(--s-radius-2);
  padding: var(--s-space-4);
}

.lab-phase-card-title {
  font-size: var(--s-font-size-0);
  font-weight: 500;
  color: var(--s-color-fg-muted);
  margin-bottom: var(--s-space-3);
  font-family: var(--s-font-mono);
}

.lab-phase-glyphs {
  display: flex;
  gap: var(--s-space-2);
  align-items: center;
}

.lab-phase-glyph {
  width: 32px;
  height: 32px;
}

.lab-phase-wordmark {
  margin-top: var(--s-space-3);
  height: 24px;
  max-width: 100%;
}

.lab-iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

.lab-viewport-content {
  padding: var(--s-space-5);
  overflow-y: auto;
  height: 100%;
}

/* Collapsed sidebar variant — for pages that want full viewport */
.lab-page[data-sidebar="collapsed"] {
  grid-template-columns: 1fr;
}

.lab-page[data-sidebar="collapsed"] .lab-sidebar {
  display: none;
}

/* Responsive */
@media (max-width: 768px) {
  .lab-page {
    grid-template-columns: 1fr;
  }

  .lab-sidebar {
    display: none;
  }
}

/* Scrollbars */
.lab-sidebar::-webkit-scrollbar {
  width: 6px;
}

.lab-sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.lab-sidebar::-webkit-scrollbar-thumb {
  background: var(--s-color-fg-soft);
  border-radius: 3px;
}