.site-header {
  position: sticky;
  z-index: 1000;
  top: 0;
  width: 100%;
  border-bottom: 1px solid rgba(228, 231, 236, 0.8);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px);
}

.header-container {
  display: flex;
  min-height: 82px;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  font-family: var(--font-title);
  font-size: 1.55rem;
  font-weight: 700;
  box-shadow: var(--shadow-primary);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-text strong {
  color: var(--dark);
  font-family: var(--font-title);
  font-size: 1.25rem;
}

.brand-text small {
  margin-top: 5px;
  color: var(--primary);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.main-navigation {
  display: flex;
  align-items: center;
  gap: 6px;
}

.main-navigation > a {
  position: relative;
  padding: 11px 13px;
  border-radius: var(--radius-pill);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 700;
  transition:
    color var(--transition),
    background var(--transition),
    transform var(--transition);
}

.main-navigation > a:not(.header-contact):hover,
.main-navigation > a:not(.header-contact).active {
  background: var(--primary-light);
  color: var(--primary);
}

.main-navigation .header-contact {
  margin-left: 8px;
  padding-inline: 20px;
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 12px 28px rgba(23, 70, 162, 0.18);
}

.main-navigation .header-contact:hover,
.main-navigation .header-contact.active {
  transform: translateY(-2px);
  background: var(--primary-dark);
}

.menu-toggle {
  display: none;
  width: 48px;
  height: 48px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border-radius: 14px;
  background: var(--primary-light);
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--primary);
  transition:
    transform var(--transition),
    opacity var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 1050px) {
  .menu-toggle {
    display: flex;
  }

  .main-navigation {
    position: fixed;
    top: 82px;
    right: 0;
    left: 0;
    display: flex;
    max-height: 0;
    padding: 0 20px;
    border-bottom: 1px solid transparent;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    background: var(--surface);
    opacity: 0;
    visibility: hidden;
    overflow: hidden;
    transition:
      max-height 0.4s ease,
      padding 0.4s ease,
      opacity 0.3s ease,
      visibility 0.3s ease;
  }

  .main-navigation.active {
    max-height: calc(100vh - 82px);
    padding: 22px 20px 30px;
    border-color: var(--border);
    opacity: 1;
    visibility: visible;
    overflow-y: auto;
    box-shadow: 0 24px 40px rgba(16, 24, 40, 0.12);
  }

  .main-navigation > a {
    width: 100%;
    padding: 14px 16px;
  }

  .main-navigation .header-contact {
    margin-top: 8px;
    margin-left: 0;
    text-align: center;
  }
}

@media (max-width: 500px) {
  .header-container {
    min-height: 74px;
  }

  .brand-icon {
    width: 42px;
    height: 42px;
    border-radius: 13px;
    font-size: 1.35rem;
  }

  .brand-text strong {
    font-size: 1.08rem;
  }

  .brand-text small {
    font-size: 0.64rem;
  }

  .main-navigation {
    top: 74px;
  }
}