.tls-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.9));
  border-bottom: 1px solid var(--color-border-subtle);
}

.tls-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  gap: var(--space-4);
}

.tls-header__brand {
  display: flex;
  align-items: center;
}

.tls-header__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-gray-50);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.tls-header__logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 40%;
  background:
    conic-gradient(from 210deg, #38bdf8, #0ea5e9, #22c55e, #38bdf8);
  position: relative;
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.9), 0 10px 25px rgba(15, 23, 42, 0.8);
}

.tls-header__logo-mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: inherit;
  background: radial-gradient(circle at 30% 20%, rgba(248, 250, 252, 0.4), transparent 55%),
    radial-gradient(circle at 70% 80%, rgba(8, 47, 73, 0.9), rgba(15, 23, 42, 1));
}

.tls-header__logo-text {
  font-size: var(--font-size-lg);
}

.tls-header__nav {
  display: flex;
}

.tls-header__nav-list {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.tls-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  padding: 0.25rem 0;
}

.tls-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #0ea5e9, #38bdf8);
  transition: width var(--transition-base);
}

.tls-header__nav-link:hover,
.tls-header__nav-link:focus-visible {
  color: var(--color-gray-50);
}

.tls-header__nav-link:hover::after,
.tls-header__nav-link:focus-visible::after {
  width: 100%;
}

.tls-header__nav-item--highlight .tls-header__nav-link {
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(56, 189, 248, 0.55);
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.22), rgba(15, 23, 42, 0.95));
  color: var(--color-gray-50);
}

.tls-header__nav-item--highlight .tls-header__nav-link::after {
  display: none;
}

.tls-header__nav-item--highlight .tls-header__nav-link:hover,
.tls-header__nav-item--highlight .tls-header__nav-link:focus-visible {
  border-color: rgba(56, 189, 248, 0.9);
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.32), rgba(15, 23, 42, 0.98));
}

.tls-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.22rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid var(--color-border-subtle);
  background-color: rgba(15, 23, 42, 0.9);
  color: var(--color-gray-100);
  cursor: pointer;
}

.tls-header__toggle:hover,
.tls-header__toggle:focus-visible {
  border-color: var(--color-primary);
  background-color: rgba(15, 23, 42, 1);
}

.tls-header__toggle-bar {
  width: 1.3rem;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-gray-200);
  transition: transform var(--transition-base), opacity var(--transition-base), width var(--transition-base);
}

.tls-header__toggle.is-active .tls-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.tls-header__toggle.is-active .tls-header__toggle-bar:nth-child(2) {
  opacity: 0;
  width: 0.8rem;
}

.tls-header__toggle.is-active .tls-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 768px) {
  .tls-header__toggle {
    display: inline-flex;
  }

  .tls-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    transform-origin: top;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height var(--transition-slow), opacity var(--transition-base), visibility var(--transition-base);
    background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.12), transparent 55%), var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border-subtle);
  }

  .tls-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4);
    gap: 0.75rem;
  }

  .tls-header__nav-link {
    width: 100%;
    padding: 0.45rem 0;
  }

  .tls-header__nav-item--highlight .tls-header__nav-link {
    width: auto;
  }

  .tls-header__nav.is-open {
    max-height: 360px;
    opacity: 1;
    visibility: visible;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tls-header__nav,
  .tls-header__toggle-bar {
    transition: none;
  }
}