.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-tlo-cieple);
  border-bottom: var(--border-default);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.site-header__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 64px;
}

@media (min-width: 768px) {
  .site-header__inner {
    padding-inline: var(--container-padding-desktop);
    min-height: 72px;
  }
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-grafit);
  flex-shrink: 0;
}

.site-header__logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
  display: block;
}

@media (min-width: 768px) {
  .site-header__logo {
    width: 40px;
    height: 40px;
  }
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.2;
  color: var(--color-grafit);
  white-space: nowrap;
}

@media (min-width: 768px) {
  .site-header__brand-text {
    font-size: 18px;
  }
}

.site-header__toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 2px solid transparent;
  border-radius: var(--radius-card);
  background: transparent;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
  flex-shrink: 0;
}

.site-header__toggle:hover {
  background-color: rgba(31, 79, 216, 0.08);
}

.site-header__toggle:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
}

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-grafit);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-tlo-cieple);
  border-bottom: var(--border-default);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  padding: var(--space-4) var(--container-padding-mobile) var(--space-6);
}

.site-nav.is-open {
  display: block;
}

@media (min-width: 768px) {
  .site-nav {
    position: static;
    display: block;
    background: transparent;
    border: none;
    box-shadow: none;
    max-height: none;
    overflow: visible;
    padding: 0;
  }
}

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

@media (min-width: 768px) {
  .site-nav__list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-5);
  }
}

.site-nav__item {
  margin: 0;
  padding: 0;
}

.site-nav__link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-body-size);
  font-weight: 500;
  color: var(--color-grafit);
  text-decoration: none;
  border-radius: var(--radius-card);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.site-nav__link:hover {
  color: var(--color-kobalt);
  background-color: rgba(31, 79, 216, 0.08);
}

.site-nav__link:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
}

@media (min-width: 768px) {
  .site-nav__link {
    padding: var(--space-2) var(--space-3);
    white-space: nowrap;
  }
}

.site-nav__item--contact .site-nav__link {
  color: var(--color-kobalt);
  font-weight: 700;
}

@media (min-width: 768px) {
  .site-header__toggle {
    display: none;
  }
}

@media (max-width: 767px) {
  .site-header__inner {
    flex-wrap: nowrap;
  }
}