/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  height: 10vh;
  min-height: 50px;
  max-height: 70px;
}

.header-btn {
  background: none;
  border: none;
  font-size: var(--font-size-xxxl);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
  color: var(--color-text);
}

.header-btn:hover {
  background-color: var(--color-surface-elevated);
}

.header-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.header-title {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  cursor: grab;
  user-select: none;
  touch-action: pan-y;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
  width: 60%;
  height: 100%;
  outline: none;
}
.header-title:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.header-title:hover {
  background-color: var(--color-surface-elevated);
}

.header-title:active {
  cursor: grabbing;
}