/* Header styles for Auto Car Advice */

.aca-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: radial-gradient(circle at top left, rgba(212, 175, 55, 0.08), rgba(5, 6, 10, 0.98));
  border-bottom: 1px solid var(--color-border-subtle);
  backdrop-filter: blur(18px);
}

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

/* Brand */
.aca-header__brand {
  display: flex;
  align-items: center;
}

.aca-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}

.aca-header__logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 0, #f5d469, #d4af37 45%, #966f16 100%);
  color: #111;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  box-shadow: var(--shadow-soft);
}

.aca-header__logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.aca-header__logo-title {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.aca-header__logo-subtitle {
  font-size: 0.75rem;
  color: var(--color-text-soft);
}

/* Navigation */
.aca-header__nav {
  display: flex;
  align-items: center;
}

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

.aca-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-soft);
  padding-block: 0.15rem;
}

.aca-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #f5d469, #d4af37);
  transition: width var(--transition-base);
}

.aca-header__nav-link:hover::after,
.aca-header__nav-link:focus-visible::after,
.aca-header__nav-link[aria-current="page"]::after {
  width: 100%;
}

.aca-header__nav-link:hover,
.aca-header__nav-link:focus-visible,
.aca-header__nav-link[aria-current="page"] {
  color: var(--color-text);
}

.aca-header__nav-item--cta .aca-header__nav-link--button {
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(212, 175, 55, 0.65);
  background: radial-gradient(circle at top left, rgba(245, 212, 105, 0.16), rgba(212, 175, 55, 0.08));
  color: var(--color-primary-strong);
  box-shadow: 0 0 0 1px rgba(212, 175, 55, 0.1);
}

.aca-header__nav-item--cta .aca-header__nav-link--button::after {
  display: none;
}

.aca-header__nav-item--cta .aca-header__nav-link--button:hover,
.aca-header__nav-item--cta .aca-header__nav-link--button:focus-visible {
  background: radial-gradient(circle at top left, #f5d469, #d4af37 45%, #966f16 100%);
  color: #111827;
}

/* Mobile toggle */
.aca-header__toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--color-border-subtle);
  background: rgba(10, 12, 20, 0.9);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.aca-header__toggle-bar {
  position: absolute;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: 999px;
  transition: transform var(--transition-base), opacity var(--transition-base), top var(--transition-base), bottom var(--transition-base);
}

.aca-header__toggle-bar:nth-child(1) {
  top: 12px;
}

.aca-header__toggle-bar:nth-child(2) {
  top: 19px;
}

.aca-header__toggle-bar:nth-child(3) {
  bottom: 12px;
}

.aca-header__toggle[aria-expanded="true"] .aca-header__toggle-bar:nth-child(1) {
  top: 19px;
  transform: rotate(45deg);
}

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

.aca-header__toggle[aria-expanded="true"] .aca-header__toggle-bar:nth-child(3) {
  bottom: 19px;
  transform: rotate(-45deg);
}

/* Responsive */
@media (max-width: 960px) {
  .aca-header__inner {
    padding-block: var(--space-2);
  }

  .aca-header__toggle {
    display: inline-flex;
  }

  .aca-header__nav {
    position: fixed;
    inset: 64px 0 auto 0;
    background: linear-gradient(180deg, rgba(5, 6, 10, 0.98), rgba(5, 6, 10, 1));
    border-bottom: 1px solid var(--color-border-subtle);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  }

  .aca-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--container-padding-x) var(--space-5);
    gap: var(--space-3);
  }

  .aca-header__nav-link {
    font-size: 0.85rem;
  }

  .aca-header__nav-item--cta {
    width: 100%;
  }

  .aca-header__nav-item--cta .aca-header__nav-link--button {
    display: inline-flex;
    width: 100%;
    justify-content: center;
  }

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

  body.aca-header--nav-open {
    overflow: hidden;
  }
}

@media (max-width: 520px) {
  .aca-header__logo-title {
    font-size: 0.9rem;
  }

  .aca-header__logo-subtitle {
    display: none;
  }
}