/* ============================================================
   LAYOUT-PLAYGROUND.CSS - Shared Advanced Layout Builder UI
   Grid and Flexbox playground shell, preview, exports, insights
   ============================================================ */

.layout-playground {
  display: grid;
  gap: var(--space-lg);
}

.layout-playground-panel,
.layout-playground-sidebar {
  display: grid;
  gap: var(--space-lg);
}

.layout-playground__intro {
  padding: 22px 24px;
  border: 1px solid rgba(67, 97, 238, 0.12);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at top left, rgba(67, 97, 238, 0.09), transparent 42%),
    linear-gradient(180deg, #ffffff, #f8fbff 78%);
  color: var(--color-text);
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.06);
}

.layout-playground__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(67, 97, 238, 0.09);
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.layout-playground__title {
  margin-bottom: 10px;
  font-size: clamp(1.45rem, 2vw, 2rem);
  color: var(--color-text);
}

.layout-playground__text {
  max-width: 60ch;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.layout-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.layout-summary__chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--color-surface-2);
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
}

.layout-summary__chip strong {
  color: var(--color-primary);
}

.layout-shell-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #ffffff, #fbfdff);
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.05);
  overflow: hidden;
}

.layout-shell-card__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px 14px;
  border-bottom: 1px solid rgba(226, 232, 240, 0.95);
}

.layout-shell-card__title {
  margin: 0;
  font-size: 1rem;
}

.layout-shell-card__text {
  margin-top: 4px;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

.layout-inline-actions,
.layout-toolbar__actions,
.layout-viewport-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.layout-preset-rail {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  padding: 16px 18px 18px;
}

.layout-preset-btn {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 16px;
  background: linear-gradient(180deg, #ffffff, #f8fafc);
  text-align: left;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.layout-preset-btn:hover,
.layout-preset-btn:focus-visible {
  border-color: rgba(14, 165, 233, 0.45);
  box-shadow: 0 12px 24px rgba(14, 165, 233, 0.12);
  transform: translateY(-1px);
}

.layout-preset-btn--active {
  border-color: rgba(14, 165, 233, 0.54);
  background: linear-gradient(180deg, rgba(224, 242, 254, 0.9), rgba(240, 249, 255, 0.98));
}

.layout-preset-btn__name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
}

.layout-preset-btn__meta {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.layout-builder {
  display: grid;
  gap: var(--space-lg);
}

.layout-builder-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.layout-builder-nav__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: #ffffff;
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  font-weight: 700;
}

.layout-builder-nav__btn:hover,
.layout-builder-nav__btn:focus-visible {
  border-color: rgba(67, 97, 238, 0.4);
  color: var(--color-text);
}

.layout-builder-nav__btn--active {
  border-color: rgba(67, 97, 238, 0.4);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.layout-builder-focus {
  margin-bottom: 12px;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

.layout-builder-section {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #ffffff, #fbfdff);
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.05);
  overflow: hidden;
}

.layout-builder-section__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 20px 14px;
  border-bottom: 1px solid rgba(226, 232, 240, 0.95);
}

.layout-builder-section__title {
  margin: 0;
  font-size: 1rem;
}

.layout-builder-section__text {
  margin-top: 4px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.layout-builder-section__body {
  padding: 18px 20px 20px;
}

.layout-form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.layout-field,
.layout-track-card,
.layout-item-row,
.layout-insight-list li,
.layout-selection-card {
  border: 1px solid rgba(226, 232, 240, 0.98);
  border-radius: 16px;
  background: #ffffff;
}

.layout-field {
  display: grid;
  gap: 8px;
  padding: 14px;
}

.layout-field--full {
  grid-column: 1 / -1;
}

.layout-field label,
.layout-track-card__label,
.layout-mini-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.layout-field input,
.layout-field select,
.layout-track-card input,
.layout-track-card select,
.layout-item-row input,
.layout-item-row select,
.layout-selection-card input,
.layout-selection-card select,
.layout-selection-card textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-surface);
}

.layout-track-editor {
  display: grid;
  gap: 14px;
}

.layout-track-toolbar,
.layout-item-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.layout-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.layout-chip-btn {
  padding: 8px 12px;
  border: 1px solid rgba(148, 163, 184, 0.28);
  border-radius: 999px;
  background: #ffffff;
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
}

.layout-chip-btn:hover,
.layout-chip-btn:focus-visible {
  border-color: rgba(14, 165, 233, 0.45);
  color: var(--color-text);
}

.layout-track-list,
.layout-item-list,
.layout-selection-grid,
.layout-insight-list {
  display: grid;
  gap: 12px;
}

.layout-track-card {
  display: grid;
  gap: 12px;
  padding: 14px;
}

.layout-track-card__grid {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  gap: 10px;
  align-items: center;
}

.layout-item-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  padding: 14px;
}

.layout-item-row__main {
  display: grid;
  gap: 6px;
}

.layout-item-row__titlebar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.layout-item-row__title {
  font-size: 0.95rem;
  font-weight: 700;
}

.layout-swatch {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: var(--swatch, #cbd5e1);
}

.layout-item-row__meta {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.layout-item-row__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.layout-item-row--selected,
.layout-selection-card--selected {
  border-color: rgba(14, 165, 233, 0.5);
  box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.08);
}

.layout-selection-card {
  padding: 14px;
}

.layout-selection-card__title {
  margin-bottom: 12px;
  font-size: 0.95rem;
}

.layout-stage-card {
  display: grid;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(180deg, #ffffff, #fbfdff);
  box-shadow: 0 12px 34px rgba(15, 23, 42, 0.08);
}

.layout-stage-card__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px 14px;
  border-bottom: 1px solid rgba(226, 232, 240, 0.95);
  color: var(--color-text);
  background:
    linear-gradient(180deg, rgba(248, 250, 252, 0.9), rgba(255, 255, 255, 0.96));
}

.layout-stage-card__title {
  margin: 0;
  color: var(--color-text);
}

.layout-stage-card__text {
  margin-top: 4px;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

.layout-stage-card__body {
  padding: 16px;
  background: linear-gradient(180deg, #f8fafc, #eef2f7);
}

.layout-stage {
  display: grid;
  place-items: center;
  min-height: 440px;
  border-radius: 20px;
  padding: 12px;
  background:
    linear-gradient(90deg, rgba(148, 163, 184, 0.05) 1px, transparent 1px),
    linear-gradient(rgba(148, 163, 184, 0.05) 1px, transparent 1px),
    linear-gradient(180deg, #122039, #0f172a);
  background-size: 24px 24px, 24px 24px, auto;
}

.layout-stage__frame {
  width: min(100%, var(--layout-stage-width, 760px));
  min-height: var(--layout-stage-height, 420px);
  padding: 14px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.92), rgba(15, 23, 42, 0.72));
  overflow: hidden;
}

.layout-stage__meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  color: rgba(226, 232, 240, 0.72);
  font-size: 0.8125rem;
}

.layout-stage__canvas {
  position: relative;
  min-height: calc(var(--layout-stage-height, 420px) - 36px);
  border-radius: 14px;
  background: var(--layout-canvas-bg, #101b31);
  padding: 12px;
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}

.layout-stage__hint {
  margin-top: 14px;
  color: rgba(226, 232, 240, 0.64);
  font-size: 0.8125rem;
}

.layout-viewport-btn,
.layout-history-btn,
.layout-export-tab {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: #ffffff;
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
}

.layout-viewport-btn:hover,
.layout-history-btn:hover,
.layout-export-tab:hover,
.layout-viewport-btn:focus-visible,
.layout-history-btn:focus-visible,
.layout-export-tab:focus-visible {
  border-color: rgba(67, 97, 238, 0.4);
  color: var(--color-text);
  background: #ffffff;
}

.layout-viewport-btn--active,
.layout-export-tab--active {
  background: var(--color-primary-light);
  border-color: rgba(67, 97, 238, 0.4);
  color: var(--color-primary);
}

.layout-history-btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}

.layout-grid-canvas,
.layout-flex-canvas {
  min-height: 100%;
  border-radius: 12px;
  padding: var(--layout-padding, 24px);
  background: var(--layout-surface-bg, #f8fafc);
  box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.28);
}

.layout-grid-canvas {
  display: grid;
  position: relative;
  gap: var(--layout-gap-y, 16px) var(--layout-gap-x, 16px);
  isolation: isolate;
}

.layout-grid-cell {
  min-height: 48px;
  border: 1px dashed rgba(148, 163, 184, 0.36);
  border-radius: 10px;
  background: rgba(226, 232, 240, 0.32);
  pointer-events: none;
}

.layout-grid-cell__label {
  display: inline-flex;
  padding: 4px 8px;
  margin: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  color: #64748b;
  font-size: 0.7rem;
  font-weight: 700;
}

.layout-grid-item,
.layout-flex-item {
  position: relative;
  overflow: hidden;
  border-radius: 14px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.1);
}

.layout-grid-item {
  display: grid;
  min-width: 0;
  min-height: 56px;
  border: 2px solid transparent;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

.layout-grid-item:hover,
.layout-flex-item:hover {
  transform: translateY(-1px);
}

.layout-grid-item--selected,
.layout-flex-item--selected {
  border-color: rgba(14, 165, 233, 0.95);
  box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.14), 0 16px 32px rgba(15, 23, 42, 0.16);
}

.layout-grid-item__button,
.layout-flex-item__button {
  display: grid;
  gap: 6px;
  width: 100%;
  height: 100%;
  padding: 12px;
  text-align: left;
  color: inherit;
}

.layout-grid-item__eyebrow,
.layout-flex-item__eyebrow {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.78;
}

.layout-grid-item__title,
.layout-flex-item__title {
  font-size: 0.95rem;
  font-weight: 700;
}

.layout-grid-item__meta,
.layout-flex-item__meta {
  font-size: 0.75rem;
  opacity: 0.78;
}

.layout-grid-item__handle {
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.82), rgba(255, 255, 255, 0.14));
  border: 1px solid rgba(255, 255, 255, 0.5);
  cursor: nwse-resize;
}

.layout-flex-canvas {
  display: flex;
  flex-wrap: wrap;
  align-content: stretch;
}

.layout-flex-item {
  display: block;
  min-width: 84px;
  min-height: 56px;
  border: 2px solid transparent;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

.layout-flex-item[draggable='true'] {
  cursor: grab;
}

.layout-flex-item.layout-flex-item--dragging {
  opacity: 0.5;
}

.layout-export-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0 18px 14px;
}

.layout-export-panels {
  padding: 0 18px 18px;
}

.layout-export-panel {
  display: none;
  overflow: auto;
  border-radius: 14px;
  background: #0f172a;
  color: #dbeafe;
  max-height: 360px;
  overscroll-behavior: contain;
}

.layout-export-panel--active {
  display: block;
}

.layout-export-panel pre {
  margin: 0;
  padding: 18px;
  font-size: 0.84rem;
  line-height: 1.75;
}

.layout-export-panel code {
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.layout-export-panel::-webkit-scrollbar,
.layout-stage__canvas::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.layout-export-panel::-webkit-scrollbar-thumb,
.layout-stage__canvas::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.34);
  border-radius: 999px;
}

.layout-export-panel::-webkit-scrollbar-track,
.layout-stage__canvas::-webkit-scrollbar-track {
  background: transparent;
}

.layout-insights {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-lg);
}

.layout-insight-list {
  padding: 18px 20px 20px;
}

.layout-insight-list li {
  padding: 14px 16px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  font-size: 0.9rem;
}

.layout-empty-note {
  padding: 18px 20px 20px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.layout-dim {
  color: var(--color-text-muted);
}

.layout-stage-card .btn--secondary,
.layout-stage-card .btn--ghost {
  background: #ffffff;
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

.layout-stage-card .btn--secondary:hover,
.layout-stage-card .btn--ghost:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.layout-playground-page .btn--sm {
  padding: 7px 12px;
}

.layout-playground-page .layout-inline-actions .btn,
.layout-playground-page .layout-inline-actions .layout-history-btn {
  min-height: 34px;
}

@media (max-width: 1100px) {
  .layout-form-grid,
  .layout-insights {
    grid-template-columns: 1fr;
  }

  .layout-stage {
    min-height: 380px;
  }
}

@media (max-width: 720px) {
  .layout-shell-card__head,
  .layout-builder-section__head,
  .layout-stage-card__head,
  .layout-track-toolbar,
  .layout-item-toolbar,
  .layout-stage__meta {
    flex-direction: column;
    align-items: stretch;
  }

  .layout-track-card__grid,
  .layout-item-row {
    grid-template-columns: 1fr;
  }

  .layout-inline-actions,
  .layout-toolbar__actions,
  .layout-viewport-switcher,
  .layout-export-tabs {
    gap: 8px;
  }

  .layout-stage {
    min-height: 320px;
    padding: 8px;
  }

  .layout-stage__frame {
    padding: 10px;
  }

  .layout-stage__canvas {
    padding: 8px;
  }

  .layout-preset-rail,
  .layout-builder-section__body,
  .layout-shell-card__head,
  .layout-export-tabs,
  .layout-export-panels,
  .layout-insight-list,
  .layout-empty-note {
    padding-left: 14px;
    padding-right: 14px;
  }

  .layout-preset-rail {
    grid-template-columns: 1fr 1fr;
  }

  .layout-export-panel {
    max-height: 300px;
  }
}

@media (max-width: 560px) {
  .layout-playground__title {
    font-size: 1.55rem;
  }

  .layout-preset-rail,
  .layout-form-grid,
  .layout-insights {
    grid-template-columns: 1fr;
  }

  .layout-summary {
    gap: 8px;
  }

  .layout-summary__chip {
    width: 100%;
    justify-content: space-between;
  }
}