.site-header {
  position: fixed;
  z-index: 900;
  inset: 0 0 auto;
  min-width: 320px;
  background: rgba(10, 14, 23, 0.97);
  border-bottom: 1px solid var(--color-frame);
}

.site-header__inner {
  display: flex;
  align-items: center;
  min-height: 76px;
  gap: 1.25rem;
}

.site-header-spacer {
  height: 77px;
}

.site-header__brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.625rem;
  min-width: 0;
  color: var(--color-text);
  text-decoration: none;
}

.site-header__brand:hover {
  color: var(--color-text);
}

.site-header__logo {
  flex: 0 0 40px;
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.site-header__brand-name {
  white-space: nowrap;
  font-family: var(--font-heading);
  font-size: 1.5625rem;
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1;
}

.site-navigation {
  min-width: 0;
  margin-left: auto;
}

.site-navigation__list {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-navigation__list li,
.site-navigation__list li + li {
  display: flex;
  align-items: center;
  margin: 0;
  padding: 0;
}

.site-navigation__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.035em;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.site-navigation__link:hover,
.site-navigation__link[aria-current="page"] {
  border-bottom-color: var(--color-primary);
  color: var(--color-text);
}

.site-navigation__list .site-navigation__mobile-only,
.site-navigation__list .site-navigation__mobile-contact,
.nav-toggle {
  display: none;
}

@media (max-width: 1120px) {
  .site-header__inner {
    min-height: 70px;
  }

  .site-header-spacer {
    height: 71px;
  }

  .site-navigation {
    position: fixed;
    z-index: 901;
    top: 71px;
    right: 0;
    left: 0;
    display: none;
    max-height: calc(100vh - 71px);
    overflow-y: auto;
    overflow-x: hidden;
    padding: 1.25rem max(var(--container-padding), 1.25rem) 1.5rem;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-platinum);
  }

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

  .site-navigation__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-navigation__list li,
  .site-navigation__list li + li {
    display: block;
    border-bottom: 1px solid var(--color-frame);
  }

  .site-navigation__link {
    width: 100%;
    min-height: 48px;
    padding: 0.75rem 0;
    border-bottom: 0;
    font-size: 0.875rem;
    letter-spacing: 0.02em;
    white-space: normal;
  }

  .site-navigation__list .site-navigation__mobile-only,
  .site-navigation__list .site-navigation__mobile-contact {
    display: block;
  }

  .site-navigation__mobile-contact {
    margin-top: 1rem !important;
    border-bottom: 0 !important;
  }

  .site-navigation__mobile-contact .button {
    width: 100%;
  }

  .nav-toggle {
    display: inline-flex;
    flex: 0 0 44px;
    align-items: center;
    justify-content: center;
    width: 44px;
    min-width: 44px;
    height: 44px;
    margin-left: auto;
    padding: 0;
    border: 1px solid var(--color-frame);
    border-radius: 0;
    background: transparent;
    color: var(--color-text);
    gap: 5px;
  }

  .nav-toggle:hover,
  .nav-toggle[aria-expanded="true"] {
    border-color: var(--color-primary);
    background: rgba(37, 99, 235, 0.12);
  }

  .nav-toggle__line {
    display: block;
    width: 20px;
    height: 1px;
    background: currentColor;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

@media (max-width: 700px) {
  .site-header__inner {
    min-height: 64px;
    gap: 0.75rem;
  }

  .site-header-spacer {
    height: 65px;
  }

  .site-navigation {
    top: 65px;
    max-height: calc(100vh - 65px);
  }

  .site-header__logo {
    flex-basis: 34px;
    width: 34px;
    height: 34px;
  }

  .site-header__brand-name {
    font-size: 1.25rem;
  }
}

ul { list-style: none !important; }
.nav-toggle { flex-direction: column; }