/* 02a — nagłówek strony: pasek, znak firmowy, nawigacja, przełącznik motywu.
   Źródło: makieta style.css l. 228–294 i 1631–1636, themes.css l. 19–40. */

.header {
  height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  padding-inline: var(--page-pad);
  background: var(--dark);
  color: var(--ai-biel);
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--ai-line-ciemne);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.55rem;
  letter-spacing: -0.065em;
  line-height: 1.05;
}
.brand img {
  filter: brightness(0) invert(1);
  width: 27px;
  height: 33px;
}
.brand small {
  display: block;
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  margin-bottom: 5px;
}
.brand-four {
  color: var(--soft-duzy);
}
.header nav {
  display: flex;
  gap: 30px;
  font-size: 0.8125rem;
  font-weight: 550;
  align-items: center;
}
.header nav {
  gap: 24px;
}
.header nav a {
  position: relative;
  padding-block: 12px;
}
.header nav a::after {
  content: "";
  position: absolute;
  bottom: 3px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--soft-duzy);
  transition: width 0.2s;
}
.header nav a:hover::after {
  width: 100%;
}
.menu-toggle {
  display: none;
}
.header :focus-visible {
  outline-color: var(--soft);
}
.header .button-label {
  font: inherit;
}
.label-short {
  display: none;
}
/* Przełącznik motywu: wariant ogólny i wariant w ciemnym pasku. */
.theme-select {
  font: inherit;
  font-size: 0.75rem;
  padding: 9px 24px 9px 12px;
  border: 1px solid var(--ai-line-ui);
  border-radius: 3px;
  background: var(--ai-card);
  color: var(--ai-heading);
  max-width: 155px;
  cursor: pointer;
  min-height: 40px;
}
.header .theme-select {
  background: var(--dark);
  color: var(--ai-biel);
  border-color: var(--ai-text-ciemne);
  align-self: center;
}