/*
 * Structural layout: header, dockable tab strip, content region, footer.
 * Responsive from 320px upward with no sideways scroll on the document body.
 */

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--md-bg);
  color: var(--md-on-surface);
  font: var(--type-body);
  transition: background-color var(--motion-medium) var(--motion-easing),
    color var(--motion-medium) var(--motion-easing);
}

.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--md-primary);
  color: var(--md-on-primary);
  padding: calc(var(--space-unit) * 1.5) calc(var(--space-unit) * 2);
  border-radius: 0 0 var(--shape-sm) 0;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
}

.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: calc(var(--space-unit) * 1.5);
  padding: calc(var(--space-unit) * 1.5) calc(var(--space-unit) * 2);
  background: var(--md-surface);
  border-bottom: 1px solid var(--md-outline);
  position: sticky;
  top: 0;
  z-index: 20;
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-unit);
  font: var(--type-title);
  margin-right: auto;
  min-width: 0;
}

.app-header__brand img {
  width: 32px;
  height: 32px;
  flex: none;
}

.app-header__brand-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.app-header__controls {
  display: flex;
  align-items: center;
  gap: calc(var(--space-unit) * 0.75);
  flex-wrap: wrap;
}

/* Tab strip: dockable (top by default, can be docked to the side on wide viewports),
   with reordering, pinning, grouping and overflow into a "More tabs" menu. */
.tab-region {
  background: var(--md-surface);
  border-bottom: 1px solid var(--md-outline);
  position: sticky;
  top: var(--header-height, 0);
  z-index: 15;
}

.tab-strip {
  display: flex;
  align-items: stretch;
  gap: 2px;
  overflow: hidden;
  padding: 0 calc(var(--space-unit) * 1.5);
  min-height: var(--row-height);
}

.tab-strip[data-dock="start"] {
  flex-direction: column;
}

.app-shell[data-tab-dock="start"] {
  flex-direction: row;
}
.app-shell[data-tab-dock="start"] .tab-region {
  border-bottom: none;
  border-right: 1px solid var(--md-outline);
  min-width: 220px;
  max-width: 280px;
}
.app-shell[data-tab-dock="start"] .app-main {
  flex: 1;
  min-width: 0;
}

.tab-group {
  display: flex;
  align-items: stretch;
  gap: 2px;
}
.tab-group[data-grouped="true"] {
  padding: 2px;
  margin: 4px 2px;
  border: 1px dashed var(--md-outline);
  border-radius: var(--shape-sm);
}
.tab-group__label {
  font: var(--type-label);
  color: var(--md-on-surface-variant);
  align-self: center;
  padding: 0 calc(var(--space-unit) * 0.75);
  white-space: nowrap;
}

.app-main {
  flex: 1;
  padding: calc(var(--space-unit) * 2);
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

.tab-panel {
  display: none;
  flex-direction: column;
  gap: calc(var(--space-unit) * 2);
}
.tab-panel[data-active="true"] {
  display: flex;
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-unit);
}

.app-footer {
  padding: calc(var(--space-unit) * 2);
  text-align: center;
  font: var(--type-body-small);
  color: var(--md-on-surface-variant);
  border-top: 1px solid var(--md-outline);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: calc(var(--space-unit) * 1.5);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: calc(var(--space-unit) * 1.25);
}

.row {
  display: flex;
  align-items: center;
  gap: var(--space-unit);
  flex-wrap: wrap;
}

.notification-region {
  position: fixed;
  right: calc(var(--space-unit) * 1.5);
  bottom: calc(var(--space-unit) * 1.5);
  display: flex;
  flex-direction: column-reverse;
  gap: var(--space-unit);
  z-index: 50;
  width: min(360px, calc(100vw - 24px));
}

@media (max-width: 480px) {
  .app-header {
    padding: var(--space-unit) calc(var(--space-unit) * 1.5);
  }
  .app-main {
    padding: calc(var(--space-unit) * 1.5);
  }
  .app-shell[data-tab-dock="start"] {
    flex-direction: column;
  }
  .app-shell[data-tab-dock="start"] .tab-region {
    max-width: none;
    border-right: none;
    border-bottom: 1px solid var(--md-outline);
  }
  .notification-region {
    left: calc(var(--space-unit) * 1.5);
    right: calc(var(--space-unit) * 1.5);
    width: auto;
  }
}