/* layout.css — app shell, tab bar, view containers */

#app {
  min-height: 100vh;
  padding-bottom: calc(var(--tab-bar-height) + env(safe-area-inset-bottom));
  max-width: 640px;
  margin: 0 auto;
  position: relative;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-bg);
  padding: var(--space-md) var(--space-md) var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
}

.app-header__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
}

.app-header__actions {
  display: flex;
  gap: var(--space-sm);
}

.icon-button {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  cursor: pointer;
  color: var(--color-text);
}

/* Language switcher — segmented pill group with all 4 languages visible */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 2px;
  gap: 0;
}

.lang-switcher__btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 6px 8px;
  min-width: 28px;
  border-radius: 999px;
  cursor: pointer;
  line-height: 1;
  transition: background 0.15s, color 0.15s;
}

.lang-switcher__btn:hover {
  color: var(--color-text);
}

.lang-switcher__btn--active {
  background: var(--color-accent);
  color: #fff;
}

.lang-switcher__btn--active:hover {
  color: #fff;
}

.view {
  padding: var(--space-md);
  display: none;
}

.view--active {
  display: block;
}

/* Tab bar */
.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-width: 640px;
  margin: 0 auto;
  height: var(--tab-bar-height);
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 20;
}

.tab-bar__item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  padding: var(--space-xs);
  transition: color 150ms ease;
}

.tab-bar__item svg {
  width: 24px;
  height: 24px;
  stroke-width: 2;
}

.tab-bar__item--active {
  color: var(--color-accent);
}

/* Loading + empty states */
.loading, .empty-state {
  padding: var(--space-xl);
  text-align: center;
  color: var(--color-text-muted);
}