/* Единая шапка сайта. Источник оформления — главная страница. */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  width: 100%;
  height: 60px;
  margin: 0;
  padding: 12px 20px;
  border: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.02);
  background: rgba(6, 6, 6, 0.45);
  -webkit-backdrop-filter: blur(8px) saturate(140%);
  backdrop-filter: blur(8px) saturate(140%);
  box-sizing: border-box;
}

.site-header .header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1280px;
  height: auto;
  margin: 0 auto;
  padding: 0;
}

.site-header .brand-name {
  position: relative;
  display: inline-flex;
  flex: 0 0 auto;
  flex-direction: column;
  margin: 0;
  padding: 0;
  color: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.6px;
  text-decoration: none;
  text-transform: none;
  opacity: 1;
}

.site-header .brand-subtitle {
  position: absolute;
  right: 0;
  bottom: -9px;
  display: block;
  margin: 0;
  padding: 0;
  color: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 9px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: 2px;
  white-space: nowrap;
  opacity: 0.85;
}

.site-header .header-nav {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 0;
  padding: 0;
}

.site-header .nav-btn {
  display: inline-block;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  color: #cfe0ff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  font-weight: 400;
  line-height: normal;
  letter-spacing: normal;
  text-decoration: none;
  text-transform: none;
  opacity: 0.9;
  transform: none;
}

.site-header .nav-btn:hover,
.site-header .nav-btn:focus-visible {
  color: #cfe0ff;
  background: transparent;
  box-shadow: none;
  opacity: 1;
  transform: none;
}

@media (max-width: 480px) {
  .site-header {
    height: 60px;
    padding: 12px 20px;
  }

  .site-header .header-nav {
    gap: 16px;
  }

  .site-header .nav-btn {
    font-size: 14px;
  }
}