.top-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.88));
  border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

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

.header-left {
  display: flex;
  align-items: center;
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.25rem 0;
  color: inherit;
}

.brand:focus-visible {
  outline: 2px solid var(--color-accent-yellow);
  outline-offset: 3px;
  border-radius: var(--radius-full);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-full);
  background: radial-gradient(circle at 0% 0%, rgba(250, 204, 21, 0.26), transparent 55%),
              radial-gradient(circle at 100% 100%, rgba(56, 189, 248, 0.22), transparent 55%),
              #0f172a;
  color: #fefce8;
  font-size: var(--text-xs);
  font-weight: 600;
  box-shadow: var(--shadow-soft);
}

.brand-star {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 999px;
  background: #facc15;
  color: #1f2937;
}

.brand-star .fa-star {
  font-size: 0.9rem;
}

.brand-rating {
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
}

.brand-title {
  font-family: "Space Grotesk", var(--font-sans);
  font-weight: 700;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  white-space: nowrap;
}

.brand-subtitle {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  max-width: 22ch;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.35rem 0;
  border-radius: var(--radius-full);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.05rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-accent-pink), var(--color-accent-cyan));
  opacity: 0;
  transform: scaleX(0.4) translateY(2px);
  transform-origin: center;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

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

.nav-link:hover::after,
.nav-link:focus-visible::after {
  opacity: 1;
  transform: scaleX(1) translateY(0);
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-accent-yellow);
  outline-offset: 3px;
}

.nav-cta-btn {
  font-size: var(--text-sm);
  padding-inline: 1.1rem;
}

.nav-cta-btn:focus-visible {
  outline: 2px solid var(--color-accent-yellow);
  outline-offset: 3px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-neutral-200);
  background-color: rgba(255, 255, 255, 0.9);
  color: var(--color-text);
  cursor: pointer;
}

.nav-toggle-box {
  display: inline-flex;
  flex-direction: column;
  gap: 0.18rem;
}

.nav-toggle-line {
  width: 1.1rem;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-neutral-700);
  transition: transform var(--transition-normal), opacity var(--transition-fast), background-color var(--transition-fast);
}

.nav-toggle-text {
  font-size: var(--text-sm);
  font-weight: 500;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-accent-yellow);
  outline-offset: 3px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

@media (max-width: 768px) {
  .header-inner {
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
  }

  .brand-subtitle {
    display: none;
  }

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

  .primary-nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    transform: translateY(0);
    background: rgba(15, 23, 42, 0.98);
    color: #f9fafb;
    border-bottom: 1px solid rgba(148, 163, 184, 0.35);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height var(--transition-slow), opacity var(--transition-normal), visibility var(--transition-normal);
  }

  .primary-nav.is-open {
    opacity: 1;
    visibility: visible;
    max-height: 420px;
  }

  .primary-nav::before {
    content: "";
    position: absolute;
    inset-inline: 0;
    top: 0;
    height: 1px;
    background: linear-gradient(90deg, rgba(236, 72, 153, 0.4), rgba(250, 204, 21, 0.3), rgba(34, 211, 238, 0.4));
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--space-2) var(--space-4) var(--space-4);
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    width: 100%;
    padding: 0.7rem 0.25rem;
    color: #e5e7eb;
  }

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

  .nav-link:hover,
  .nav-link:focus-visible {
    color: #ffffff;
  }

  .nav-cta {
    margin-top: var(--space-2);
  }

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

@media (prefers-reduced-motion: reduce) {
  .primary-nav {
    transition: none;
  }
  .nav-toggle-line {
    transition: none;
  }
}