.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 1000;
  min-height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  background: rgba(5, 7, 10, 0.58);
  backdrop-filter: blur(12px);
  transition:
    background-color 200ms ease,
    box-shadow 200ms ease;
}

.site-header.is-scrolled {
  position: fixed;
  background: rgba(5, 7, 10, 0.92);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.22);
}

.site-nav {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 42px);
}

.site-nav__brand {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav__logo {
  width: clamp(230px, 20vw, 290px);
  height: auto;
  object-fit: contain;
}

.site-nav__menu {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.4vw, 24px);
  padding: 0;
  margin: 0;
  list-style: none;
}

.site-nav__links a {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-nav__links a {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  padding-inline: 10px;
  margin-inline: -10px;
}

.site-nav__actions {
  display: flex;
  align-items: center;
  gap: clamp(14px, 1.6vw, 22px);
}

.site-nav__phones {
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-nav__phones .site-nav__phone {
  display: inline-flex;
  align-items: flex-start;
  flex-direction: column;
  gap: 1px;
  font-size: 0.72rem;
  line-height: 1.25;
  white-space: nowrap;
}

.site-nav__phone-label {
  color: var(--color-accent);
  font-family: var(--font-heading);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-nav__phone-number {
  color: var(--color-text);
}

.site-nav__toggle {
  display: none;
  width: 46px;
  height: 46px;
  margin-left: auto;
  padding: 11px;
  border: 1px solid var(--color-border);
  border-radius: 5px;
  background: transparent;
  color: #fff;
  cursor: pointer;
}

.site-nav__toggle-line {
  display: block;
  height: 2px;
  margin-block: 5px;
  background: currentColor;
  transition: transform 180ms ease, opacity 180ms ease;
}

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

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

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

@media (max-width: 1050px) {
  :root {
    --header-height: 90px;
  }

  .site-nav__logo {
    width: min(64vw, 280px);
  }

  .site-nav__toggle {
    display: block;
  }

  .site-nav__menu {
    position: fixed;
    top: var(--header-height);
    right: auto;
    bottom: auto;
    left: 0;
    width: 100vw;
    max-height: calc(100vh - var(--header-height));
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    align-items: stretch;
    justify-content: stretch;
    justify-items: stretch;
    gap: 28px;
    padding: 32px var(--page-gutter) 38px;
    overflow-y: auto;
    border-top: 1px solid var(--color-border);
    background: rgba(5, 7, 10, 0.98);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity 180ms ease, transform 180ms ease;
    text-align: center;
  }

  .site-nav__menu.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav__links {
    width: 100%;
    display: grid;
    gap: 0;
    justify-items: stretch;
  }

  .site-nav__links a {
    display: flex;
    width: 100%;
    justify-content: center;
    padding-block: 13px;
    margin-inline: 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9rem;
  }

  .site-nav__actions {
    width: 100%;
    align-items: center;
    flex-direction: column;
    flex-wrap: wrap;
    justify-content: center;
    text-align: center;
  }

  .site-nav__phones {
    display: grid;
    gap: 14px;
  }

  .site-nav__phones .site-nav__phone {
    align-items: center;
    justify-content: center;
    margin-inline: auto;
    font-size: 0.92rem;
    text-align: center;
  }

  .site-nav__phone-label {
    font-size: 0.64rem;
  }

  .site-nav__actions .button {
    width: min(100%, 260px);
    align-self: center;
    margin-inline: auto;
  }
}

@media (max-width: 520px) {
  .site-nav__actions {
    align-items: center;
  }

}