.mt-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: linear-gradient(
    to bottom,
    rgba(5, 6, 9, 0.98),
    rgba(5, 6, 9, 0.9),
    rgba(5, 6, 9, 0.8),
    transparent
  );
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.9);
}

.mt-header .container {
  max-width: 1440px;
}

.mt-header-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.mt-header-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}

.mt-header-logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: conic-gradient(
    from 140deg,
    var(--color-primary),
    var(--color-burgundy),
    var(--color-emerald),
    var(--color-primary)
  );
  box-shadow:
    0 0 0 1px rgba(15, 23, 42, 0.95),
    0 0 24px rgba(244, 196, 101, 0.8);
}

.mt-header-logo-text {
  display: flex;
  flex-direction: column;
}

.mt-header-logo-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.mt-header-logo-subtitle {
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.mt-header-nav {
  display: flex;
  align-items: center;
  min-width: 0;
  margin-left: auto;
  margin-right: var(--space-4);
}

.mt-header-menu {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-3), 1.2vw, var(--space-4));
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.mt-header-item,
.mt-header-link {
  white-space: nowrap;
}

.mt-header-link {
  position: relative;
  padding-block: 0.25rem;
  text-decoration: none;
  transition: color var(--transition-base);
}

.mt-header-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-emerald));
  transition: width var(--transition-base);
}

.mt-header-link:hover,
.mt-header-link:focus-visible {
  color: var(--color-text);
}

.mt-header-link:hover::after,
.mt-header-link:focus-visible::after {
  width: 100%;
}

.mt-header-cta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.mt-header-age-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.96);
  font-size: 0.7rem;
  color: var(--color-text-muted);
}

.mt-header-age-badge strong {
  color: var(--color-danger);
}

.mt-header-age-badge i {
  color: var(--color-primary);
  font-size: 0.8rem;
}

.mt-header-cta-btn {
  white-space: nowrap;
}

.mt-header-toggle {
  display: none;
  position: relative;
  width: 38px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.9);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  transition:
    background var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base);
}

.mt-header-toggle-bar {
  width: 18px;
  height: 1.5px;
  border-radius: 999px;
  background: var(--color-text);
  transition:
    transform var(--transition-base),
    opacity var(--transition-base);
}

.mt-header-toggle:focus-visible {
  box-shadow: var(--shadow-outline);
}

.mt-header-toggle.is-open {
  border-color: rgba(244, 196, 101, 0.8);
  box-shadow: var(--shadow-outline);
  background: rgba(15, 23, 42, 0.98);
}

.mt-header-toggle.is-open .mt-header-toggle-bar:first-child {
  transform: translateY(3px) rotate(42deg);
}

.mt-header-toggle.is-open .mt-header-toggle-bar:last-child {
  transform: translateY(-3px) rotate(-42deg);
}

@media (max-width: 1180px) {
  .mt-header-nav {
    position: fixed;
    inset: 72px 0 auto 0;
    background: radial-gradient(circle at top, rgba(15, 23, 42, 0.98), rgba(5, 6, 9, 0.98));
    border-bottom: 1px solid rgba(15, 23, 42, 0.9);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition:
      transform var(--transition-base),
      opacity var(--transition-base);
    margin: 0;
  }

  .mt-header-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .mt-header-menu {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--container-padding-inline);
    gap: var(--space-3);
  }

  .mt-header-item {
    width: 100%;
  }

  .mt-header-link {
    display: block;
    width: 100%;
    padding-block: 0.55rem;
    font-size: 1rem;
  }

  .mt-header-toggle {
    display: inline-flex;
  }

  .mt-header-cta {
    gap: var(--space-2);
  }

  .mt-header-logo-subtitle {
    display: none;
  }
}

@media (max-width: 820px) {
  .mt-header-age-badge span {
    display: none;
  }
}

@media (max-width: 640px) {
  .mt-header-inner {
    height: 68px;
  }

  .mt-header-nav {
    inset-block-start: 68px;
  }

  .mt-header-cta-btn {
    display: none;
  }

  .mt-header-age-badge span {
    display: none;
  }
}

@media (max-width: 420px) {
  .mt-header-inner {
    gap: var(--space-2);
  }

  .mt-header-logo {
    gap: var(--space-2);
  }

  .mt-header-logo-mark {
    width: 28px;
    height: 28px;
  }

  .mt-header-logo-title {
    font-size: 0.92rem;
    letter-spacing: 0.1em;
  }
}