.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--bg-base);
  border-bottom: var(--border-thin) solid var(--line-subtle);
  height: 72px;
}

.site-header__inner {
  /* The navigation is wider than the regular content container. */
  max-width: 1720px;
  margin-inline: auto;
  padding-inline: var(--container-padding);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  min-width: 0;
}

.site-header__logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 48px;
  height: 48px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  position: relative;
  z-index: 1001;
}

.site-header__toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  margin-block: 3px;
  transition: background-color var(--transition-fast),
              transform var(--transition-fast),
              opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(8px) 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(-8px) rotate(-45deg);
}

.site-header__toggle:focus-visible {
  outline: var(--border-thick) solid var(--line-accent);
  outline-offset: 2px;
}

.site-header__nav {
  display: flex;
  align-items: center;
  flex-shrink: 1;
  min-width: 0;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__nav-item {
  margin: 0;
  padding: 0;
  flex-shrink: 0;
}

.site-header__nav-link {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-primary);
  text-decoration: none;
  padding-block: var(--space-2);
  padding-inline: var(--space-2);
  white-space: nowrap;
  transition: color var(--transition-fast);
  position: relative;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  bottom: 0;
  height: 2px;
  background-color: var(--line-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.site-header__nav-link:hover {
  color: var(--text-secondary);
}

.site-header__nav-link:hover::after {
  transform: scaleX(1);
}

.site-header__nav-link:focus-visible {
  outline: var(--border-thick) solid var(--line-accent);
  outline-offset: 2px;
}

.site-header__nav-item--contact .site-header__nav-link {
  color: var(--text-secondary);
  border: var(--border-thin) solid var(--line-accent);
  padding-block: var(--space-2);
  padding-inline: var(--space-3);
}

.site-header__nav-item--contact .site-header__nav-link:hover {
  background-color: var(--bg-panel);
  color: var(--text-secondary);
}

.site-header__nav-item--contact .site-header__nav-link::after {
  display: none;
}

@media (max-width: 1279px) {
  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(80vw, 320px);
    background-color: var(--bg-base);
    border-left: var(--border-thin) solid var(--line-subtle);
    transform: translateX(100%);
    transition: transform var(--transition-fast);
    z-index: 1000;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-6) var(--space-4);
    overflow-y: auto;
    display: flex;
  }

  .site-header__nav[data-open="true"] {
    transform: translateX(0);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    width: 100%;
  }

  .site-header__nav-item {
    flex-shrink: 0;
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-3);
    font-size: 18px;
    white-space: normal;
  }

  .site-header__nav-link::after {
    display: none;
  }

  .site-header__nav-item--contact .site-header__nav-link {
    border: var(--border-thin) solid var(--line-accent);
    padding: var(--space-3);
  }
}

@media (max-width: 767px) {
  .site-header {
    height: 64px;
  }

  .site-header__logo {
    width: 40px;
    height: 40px;
  }

  .site-header__brand-text {
    display: none;
  }

  .site-header__inner {
    padding-inline: var(--space-3);
  }
}

@media (min-width: 1280px) {
  .site-header__inner {
    gap: clamp(12px, 1.25vw, var(--space-4));
  }

  .site-header__brand {
    gap: clamp(var(--space-2), 1vw, var(--space-3));
  }

  .site-header__logo {
    width: clamp(40px, 3vw, 48px);
    height: clamp(40px, 3vw, 48px);
  }

  .site-header__brand-text {
    font-size: clamp(16px, 1.15vw, 20px);
    letter-spacing: clamp(0.75px, 0.08vw, 1.5px);
  }

  .site-header__nav {
    display: flex;
  }

  .site-header__nav-list {
    gap: clamp(var(--space-2), 0.9vw, var(--space-4));
  }

  .site-header__nav-link {
    font-size: clamp(12px, 0.9vw, 16px);
    letter-spacing: clamp(0.35px, 0.055vw, 1px);
    padding-inline: clamp(4px, 0.4vw, var(--space-2));
  }

  .site-header__nav-link::after {
    left: clamp(4px, 0.4vw, var(--space-2));
    right: clamp(4px, 0.4vw, var(--space-2));
  }

  .site-header__nav-item--contact .site-header__nav-link {
    padding-inline: clamp(var(--space-2), 0.65vw, var(--space-3));
  }
}

body {
  padding-top: 72px;
}

@media (max-width: 767px) {
  body {
    padding-top: 64px;
  }
}