#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

/* Reconnect banner */
#reconnect-banner {
  background: var(--warn);
  color: #fff;
  text-align: center;
  padding: 8px;
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
  z-index: 50;
}

/* Content area wraps top-bar + main-content + action-bar */
#content-area {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  min-width: 0;
}

/* Top bar */
#top-bar {
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 10;
}

#top-bar-default,
#top-bar-selection {
  display: flex;
  align-items: center;
  padding: 0 12px;
  height: 52px;
  gap: 8px;
}

#top-bar-title {
  font-size: 18px;
  font-weight: 600;
  flex: 1;
}

.top-bar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.top-bar-actions button {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.top-bar-actions button:active {
  background: var(--bg-raised);
}

/* Selection count */
#selection-count {
  flex: 1;
  font-size: 16px;
  font-weight: 500;
}

#btn-clear-selection {
  font-size: 20px;
  width: 40px;
  height: 40px;
}

/* Identify banner */
#identify-banner {
  background: var(--accent);
  color: #fff;
  text-align: center;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 500;
}

/* Search bar */
#search-bar {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  gap: 8px;
  border-top: 1px solid var(--border);
}

#search-input {
  flex: 1;
}

#btn-search-close {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Main content area */
#main-content {
  flex: 1;
  overflow: hidden;
  display: flex;
  position: relative;
}

.view {
  display: none;
  flex: 1;
  overflow-y: auto;
  padding-bottom: 16px;
  width: 100%;
  -webkit-overflow-scrolling: touch;
}

.view.active {
  display: block;
}

/* Bottom tabs */
#bottom-tabs {
  display: flex;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  padding-bottom: env(safe-area-inset-bottom);
}

.tab-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px 4px;
  gap: 3px;
  color: var(--text-muted);
  min-height: 56px;
  transition: color 0.15s;
}

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

.tab-icon {
  font-size: 20px;
}

.tab-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Action bar */
.action-bar {
  display: flex;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.action-btn {
  flex: 1;
  padding: 14px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  min-height: 44px;
}

.action-btn:active {
  background: var(--accent);
  border-color: var(--accent);
}

.action-btn-announce {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
}

.action-btn-announce:active {
  opacity: 0.75;
}

.action-btn-stop {
  background: #5a1a1a;
  border-color: #8b2020;
  color: #ff6b6b;
}

.action-btn-stop:active {
  opacity: 0.75;
}

/* Tablet: sidebar navigation */
@media (min-width: 768px) {
  #app {
    flex-direction: row;
    flex-wrap: nowrap;
  }

  #reconnect-banner {
    position: fixed;
    top: 0;
    left: 80px;
    right: 0;
    z-index: 200;
  }

  #bottom-tabs {
    flex-direction: column;
    width: 80px;
    border-top: none;
    border-right: 1px solid var(--border);
    padding-bottom: 0;
    height: 100%;
    order: -1;
    flex-shrink: 0;
    justify-content: flex-start;
    padding-top: 8px;
  }

  .tab-btn {
    flex: 0 0 auto;
    padding: 16px 8px;
    width: 100%;
  }

  #content-area {
    flex: 1;
    min-width: 0;
  }

  .action-bar {
    padding: 10px 16px;
  }
}

/* Desktop: wider layout */
@media (min-width: 1024px) {
  #bottom-tabs {
    width: 100px;
  }

  .tab-label {
    font-size: 11px;
  }

  #main-content {
    /* On desktop, device list and action bar get more breathing room */
  }
}

/* Pull-to-refresh spinner */
.ptr-spinner {
  display: none;
  text-align: center;
  padding: 12px;
  color: var(--text-muted);
  font-size: 13px;
}

.ptr-spinner.visible {
  display: block;
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
  text-align: center;
  color: var(--text-muted);
  gap: 12px;
}

.empty-state-icon {
  font-size: 48px;
  opacity: 0.4;
}

.empty-state-text {
  font-size: 14px;
  line-height: 1.6;
}