.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(6, 5, 26, 0.85);
  border-bottom: 1px solid rgba(0, 230, 255, 0.08);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: 1160px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  text-transform: uppercase;
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: transparent;
  border: 1px solid rgba(0, 230, 255, 0.3);
  border-radius: 10px;
  padding: 0.6rem;
  cursor: pointer;
  transition: background var(--transition-base),
    border-color var(--transition-base);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.nav-toggle__bar {
  width: 22px;
  height: 2px;
  background: var(--text);
  display: block;
}

.main-nav {
  display: flex;
  align-items: center;
}
.main-nav__list {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.main-nav__list a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-base);
}
.main-nav__list a:hover,
.main-nav__list a:focus-visible {
  color: var(--cyan);
}

.header-mail {
  color: var(--cyan);
  text-decoration: none;
  font-weight: 500;
  transition: opacity var(--transition-base);
}
.header-mail:hover,
.header-mail:focus-visible {
  opacity: 0.75;
}

.main-nav__email {
  display: none;
}

@media (max-width: 900px) {
  .site-header__inner {
    padding: 0.85rem 1.25rem;
  }
}

@media (max-width: 783px) {
  .nav-toggle {
    display: flex;
  }
  .header-mail {
    display: none;
  }
  .main-nav__email {
    display: block;
    margin-top: 0.5rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(0, 230, 255, 0.15);
  }
  .main-nav__email a {
    color: var(--cyan);
    font-weight: 500;
  }
  .main-nav {
    position: absolute;
    inset: 100% 1.5rem auto;
    background: rgba(9, 12, 32, 0.95);
    border: 1px solid rgba(0, 230, 255, 0.15);
    border-radius: 18px;
    padding: 1rem 1.25rem;
    transform-origin: top right;
    transform: scaleY(0);
    opacity: 0;
    transition: transform var(--transition-base), opacity var(--transition-base);
    pointer-events: none;
    z-index: 20;
  }
  .main-nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  .site-header__inner {
    position: relative;
  }
  .main-nav.is-open {
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
    margin-top: 0.75rem;
  }
}