/*
 * Page layout skeleton. Later packages fill the named regions:
 *   .toolbar     actions (import, export, analysis controls)
 *   .board-area  the board
 *   .side-panel  move list, evaluation graph, move detail
 *
 * Desktop: board and side panel in two columns. Phone (below 720 px): a single
 * column, no horizontal scrolling down to 360 px wide.
 */

.app {
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--space-4);
  min-width: 0;
}

.app__loading {
  padding: var(--space-6) 0;
  color: var(--color-text-muted);
  text-align: center;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--side-panel-width);
  grid-template-areas:
    "toolbar toolbar"
    "board   panel";
  gap: var(--space-4);
  align-items: start;
}

.toolbar {
  grid-area: toolbar;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.board-area {
  grid-area: board;
  min-width: 0;
  display: flex;
  justify-content: center;
}

.side-panel {
  grid-area: panel;
  min-width: 0;
  display: grid;
  gap: var(--space-4);
  overflow-wrap: anywhere;
}

/* Anything interactive in the app is at least a 44 px touch target. */
.toolbar > *,
.side-panel button,
.side-panel [role="button"],
.side-panel [role="option"] {
  min-height: var(--touch-target);
}

@media (max-width: 719.98px) {
  .app {
    padding: var(--space-2);
  }

  .layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "toolbar"
      "board"
      "panel";
    gap: var(--space-3);
  }

  .notice {
    margin: var(--space-4) 0;
    padding: var(--space-4);
  }
}

/* App shell (WP11): header, start screen, banners, footer. */
.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  margin-bottom: var(--space-4);
}

.app-header__title {
  margin: 0;
  font-size: var(--text-xl);
}

.app-header__nav,
.start__actions,
.app-banner__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.app-header__nav button,
.start__actions button,
.app-banner__actions button {
  min-height: var(--touch-target);
}

.app-banner:empty {
  display: none;
}

.app-banner__item {
  margin: 0 0 var(--space-4);
}

.start {
  max-width: 40rem;
  margin: var(--space-6) auto;
}

.start__message:empty {
  display: none;
}

.start__message {
  color: var(--color-danger);
}

.board-column {
  display: grid;
  gap: var(--space-2);
  width: 100%;
  min-width: 0;
}

.app-footer {
  margin-top: var(--space-6);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

[hidden] {
  display: none !important;
}