.app-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-header);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: var(--header-h);
  padding: 0 max(var(--space-4), calc((100% - var(--content-w)) / 2));
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.icon-btn {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
}

.icon-btn:hover {
  background: var(--color-bg);
}

.search {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
}

.search__icon {
  position: absolute;
  left: var(--space-3);
  width: 1.25rem;
  height: 1.25rem;
  color: var(--color-text-muted);
  pointer-events: none;
}

.search__input {
  width: 100%;
  height: 2.5rem;
  padding: 0 var(--space-4) 0 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
}

.search__input:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}