/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: transparent;
  transition:
    background-color var(--duration-base) var(--ease-standard),
    height var(--duration-base) var(--ease-standard),
    box-shadow var(--duration-base) var(--ease-standard);
}

.site-header.is-scrolled {
  height: var(--header-height-scrolled);
  background-color: rgba(247, 246, 242, 0.92);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-soft);
}

.site-header__inner {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: 0.04em;
  color: var(--color-white);
  transition: color var(--duration-base) var(--ease-standard);
}

.site-header.is-scrolled .site-logo {
  color: var(--color-ink-900);
}

.site-logo span {
  color: var(--color-gold);
}

/* Primary nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-white);
  padding: 0.4rem 0.1rem;
  transition: color var(--duration-fast) var(--ease-standard);
}

.site-header.is-scrolled .site-nav__link {
  color: var(--color-ink-900);
}

/* Signature underline: a thin facet line that sweeps in on hover */
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  height: 1px;
  width: 100%;
  background: rgba(61, 23, 0);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-base) var(--ease-standard);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: rgba(61, 23, 0);
}

.site-header.is-scrolled .site-nav__link:hover,
.site-header.is-scrolled .site-nav__link:focus-visible {
  color: var(--color-slate);
}

.site-nav__chevron {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  transition: transform var(--duration-fast) var(--ease-standard);
}

/* Dropdown (Resources) */
.site-nav__item--dropdown {
  position: relative;
}

.site-nav__dropdown {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 220px;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lifted);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity var(--duration-fast) var(--ease-standard),
    transform var(--duration-fast) var(--ease-standard),
    visibility var(--duration-fast);
}

.site-nav__item--dropdown:hover .site-nav__dropdown,
.site-nav__item--dropdown:focus-within .site-nav__dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.site-nav__item--dropdown:hover .site-nav__chevron,
.site-nav__item--dropdown:focus-within .site-nav__chevron {
  transform: rotate(180deg);
}

.site-nav__dropdown-link {
  display: block;
  padding: 0.65rem 0.9rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--color-ink-900);
  border-radius: var(--radius-sm);
  transition: background-color var(--duration-fast) var(--ease-standard);
}

.site-nav__dropdown-link:hover,
.site-nav__dropdown-link:focus-visible {
  background-color: var(--color-paper-dim);
}

/* CTA button in header */
.site-nav__cta {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-white);
  background-color: rgba(61, 23, 0);
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-sm);
  transition:
    background-color var(--duration-fast) var(--ease-standard),
    color var(--duration-fast) var(--ease-standard),
    transform var(--duration-fast) var(--ease-standard);
}

.site-nav__cta:hover,
.site-nav__cta:focus-visible {
  background-color: var(--color-gold);
  color: var(--color-ink-900);
  transform: translateY(-1px);
}

.site-header.is-scrolled .site-nav__cta {
  background-color: var(--color-ink-900);
  color: var(--color-white);
}

.site-header.is-scrolled .site-nav__cta:hover,
.site-header.is-scrolled .site-nav__cta:focus-visible {
  background-color: var(--color-gold);
  color: var(--color-ink-900);
}

/* Mobile nav toggle */
.site-nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 0;
}

.site-nav__toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
  transition:
    background-color var(--duration-fast) var(--ease-standard),
    transform var(--duration-base) var(--ease-standard),
    opacity var(--duration-fast) var(--ease-standard);
}

.site-header.is-scrolled .site-nav__toggle-bar {
  background-color: var(--color-ink-900);
}

.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(2) {
  opacity: 0;
}
.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 960px) {
  .site-nav__toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: 0;
    top: var(--header-height-scrolled);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    background-color: var(--color-ink-900);
    padding: var(--space-5) var(--container-pad);
    transform: translateX(100%);
    transition: transform var(--duration-base) var(--ease-standard);
    overflow-y: auto;
  }

  .site-nav.is-open {
    transform: translateX(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__item {
    border-bottom: 1px solid var(--color-ink-700);
  }

  .site-nav__link {
    width: 100%;
    justify-content: space-between;
    padding: var(--space-3) 0.1rem;
    color: var(--color-white) !important;
  }

  .site-nav__dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: none;
    height: 0;
    overflow: hidden;
    padding: 0;
    box-shadow: none;
    background: transparent;
    transition: height var(--duration-base) var(--ease-standard);
  }

  .site-nav__item--dropdown.is-open .site-nav__dropdown {
    height: auto;
    pointer-events: auto;
    padding-bottom: var(--space-2);
  }

  .site-nav__dropdown-link {
    color: var(--color-text-on-dark-muted);
  }

  .site-nav__dropdown-link:hover,
  .site-nav__dropdown-link:focus-visible {
    background-color: rgba(61, 23, 0);
    color: var(--color-white);
  }

  .site-nav__cta {
    margin-top: var(--space-4);
    justify-content: center;
  }
}