.tcac-header {
  position: sticky;
  top: 0;
  z-index: 40;
  width: 100%;
  background: radial-gradient(circle at top, rgba(249, 115, 22, 0.16), transparent 55%), var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
}

.tcac-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);
}

.tcac-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.tcac-brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid rgba(249, 115, 22, 0.7);
  background: radial-gradient(circle at 30% 0%, rgba(249, 115, 22, 0.4), transparent 55%), #000000;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow-primary);
}

.tcac-brand-initials {
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-neutral-50);
}

.tcac-brand-text {
  display: flex;
  flex-direction: column;
}

.tcac-brand-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.tcac-brand-tagline {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.tcac-nav {
  display: flex;
  align-items: center;
}

.tcac-nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.tcac-nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-neutral-200);
  padding-block: 0.35rem;
}

.tcac-nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  transform: scaleX(0);
  transform-origin: center;
  background: linear-gradient(90deg, #f97316, #fb923c);
  transition: transform var(--transition-base);
}

.tcac-nav-link:hover,
.tcac-nav-link:focus-visible {
  color: var(--color-neutral-50);
}

.tcac-nav-link:hover::after,
.tcac-nav-link:focus-visible::after {
  transform: scaleX(1);
}

.tcac-nav-cta .tcac-nav-link-cta {
  padding-inline: 1.4rem;
  padding-block: 0.55rem;
  border-radius: 999px;
  border: 1px solid rgba(249, 115, 22, 0.75);
  background: radial-gradient(circle at 0 0, rgba(249, 115, 22, 0.35), transparent 55%), #111111;
  box-shadow: var(--shadow-glow-primary);
  color: var(--color-neutral-50);
}

.tcac-nav-cta .tcac-nav-link-cta::after {
  display: none;
}

.tcac-nav-cta .tcac-nav-link-cta:hover,
.tcac-nav-cta .tcac-nav-link-cta:focus-visible {
  background: linear-gradient(135deg, #f97316, #fb923c);
  color: #111111;
}

.tcac-nav-toggle {
  display: none;
  flex-direction: column;
  width: 44px;
  height: 36px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: rgba(0, 0, 0, 0.9);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.9);
}

.tcac-nav-toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-neutral-100);
  transition: transform var(--transition-base), opacity var(--transition-base), background-color var(--transition-base);
}

.tcac-nav-toggle[aria-expanded="true"] .tcac-nav-toggle-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.tcac-nav-toggle[aria-expanded="true"] .tcac-nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.tcac-nav-toggle[aria-expanded="true"] .tcac-nav-toggle-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

@media (max-width: 880px) {
  .tcac-nav-toggle {
    display: inline-flex;
  }

  .tcac-nav {
    position: fixed;
    inset-inline: 0;
    top: 60px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  }

  .tcac-nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    margin-inline: auto;
    padding: var(--space-4);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    max-width: 1320px;
    background: radial-gradient(circle at top, rgba(249, 115, 22, 0.18), transparent 65%), var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-top: none;
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.9);
  }

  .tcac-nav-link {
    width: 100%;
    padding-block: 0.6rem;
  }

  .tcac-nav-link::after {
    left: 0;
    right: auto;
    width: 90px;
  }

  .tcac-nav-cta {
    width: 100%;
    margin-top: var(--space-2);
  }

  .tcac-nav-cta .tcac-nav-link-cta {
    width: 100%;
    justify-content: center;
  }

  .tcac-nav.tcac-nav-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
}

@media (max-width: 520px) {
  .tcac-brand-tagline {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tcac-nav,
  .tcac-nav-toggle-bar {
    transition: none;
  }
}