:root {
  --nav-bg: rgba(7, 10, 26, 0.72);
  --nav-border: rgba(191, 99, 255, 0.28);
  --nav-shadow: 0 0 0 1px rgba(196, 113, 255, 0.16), 0 18px 50px rgba(34, 11, 67, 0.45);
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  padding: var(--space-3) var(--space-4) 0;
}

.nav-shell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 5.5rem;
  padding: var(--space-3) var(--space-5);
  border: 1px solid var(--nav-border);
  border-radius: calc(var(--radius-xl) + 0.25rem);
  background: var(--nav-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: var(--nav-shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.62rem;
  text-decoration: none;
  color: var(--color-text);
  min-height: 44px;
  flex-shrink: 0;
}

.brand__mark {
  width: 68px;
  height: 68px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: 50%;
  background: #ffffff;
  box-shadow:
    inset 0 0 0 1px rgba(193, 109, 255, 0.18),
    0 0 30px rgba(168, 76, 255, 0.12);
}

.brand__logo {
  width: 84%;
  height: 84%;
  display: block;
  object-fit: contain;
}

.brand__text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1;
}

.brand__text strong {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 1rem + 0.7vw, 1.95rem);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand__text strong span,
.nav-link.active,
.nav-link:hover {
  color: #c85cff;
}

.brand__text small {
  margin-top: 0.16rem;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.16em;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0.95rem 1.1rem;
  border-radius: var(--radius-lg);
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: -6px;
  height: 3px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, transparent, #ea54ff, #8a3dff, transparent);
  transform: scaleX(0.2);
  opacity: 0;
  transition: transform var(--transition-interactive), opacity var(--transition-interactive);
}

.nav-link:hover,
.nav-link.active {
  background: rgba(255, 255, 255, 0.03);
  text-shadow: 0 0 16px rgba(227, 113, 255, 0.45);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  opacity: 1;
}

.nav-toggle {
  display: none;
  width: 48px;
  height: 48px;
  border: 1px solid rgba(221, 161, 255, 0.18);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.03);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  flex-shrink: 0;
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: transform var(--transition-interactive), opacity var(--transition-interactive);
}

@media (max-width: 980px) {
  .site-header {
    padding-inline: var(--space-3);
  }

  .nav-shell {
    padding: var(--space-3) var(--space-4);
    min-height: 4.75rem;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .primary-nav {
    position: absolute;
    top: calc(100% + 0.7rem);
    left: var(--space-3);
    right: var(--space-3);
    display: grid;
    gap: var(--space-2);
    padding: var(--space-3);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(210, 149, 255, 0.18);
    background: rgba(7, 10, 26, 0.94);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    transform-origin: top;
    transform: scaleY(0.92);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
  }

  .primary-nav.is-open {
    transform: scaleY(1);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-link {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 0.7rem 0.7rem 0;
  }

  .nav-shell {
    min-height: 4.4rem;
    padding: 0.85rem 1rem;
    gap: 0.75rem;
  }

  .brand {
    gap: 0.55rem;
    min-width: 0;
  }

  .brand__mark {
    width: 60px;
    height: 60px;
  }

  .brand__logo {
    width: 82%;
    height: 82%;
  }

  .brand__text strong {
    font-size: 1.02rem;
  }

  .brand__text small {
    margin-top: 0.12rem;
    font-size: 0.68rem;
    letter-spacing: 0.1em;
  }

  .nav-toggle {
    width: 46px;
    height: 46px;
  }
}

@media (max-width: 420px) {
  .site-header {
    padding: 0.6rem 0.6rem 0;
  }

  .nav-shell {
    min-height: 4.2rem;
    padding: 0.8rem 0.9rem;
  }

  .brand {
    gap: 0.48rem;
  }

  .brand__mark {
    width: 55px;
    height: 55px;
  }

  .brand__logo {
    width: 80%;
    height: 80%;
  }

  .brand__text strong {
    font-size: 0.96rem;
  }

  .brand__text small {
    font-size: 0.64rem;
    letter-spacing: 0.08em;
  }

  .nav-toggle {
    width: 44px;
    height: 44px;
  }
}