/* Navigation refinement — hover dropdowns + mobile accordion */

.nav-links {
  gap: 10px 32px;
}

.nav-group {
  position: relative;
  display: flex;
  align-items: center;
}

/* Invisible bridge so the cursor can travel into the panel */
.nav-group::after {
  content: "";
  position: absolute;
  left: -8px;
  right: -8px;
  top: 100%;
  height: 14px;
  display: none;
}

.nav-group__toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin: 0;
  padding: 8px 0 6px;
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  background: transparent;
  color: var(--on-surface-variant);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--ease), border-color var(--ease);
}

.nav-group__toggle:hover,
.nav-group:hover .nav-group__toggle,
.nav-group:focus-within .nav-group__toggle,
.nav-group.is-open .nav-group__toggle,
.nav-group.is-active .nav-group__toggle {
  color: var(--primary);
}

.nav-group.is-active .nav-group__toggle {
  border-bottom-color: var(--primary);
}

.nav-chevron {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  opacity: 0.72;
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1), opacity var(--ease);
}

.nav-group:hover .nav-chevron,
.nav-group:focus-within .nav-chevron,
.nav-group.is-open .nav-chevron,
.mobile-nav__group[open] .nav-chevron {
  transform: rotate(180deg);
  opacity: 1;
}

.nav-group__panel {
  position: absolute;
  top: calc(100% + 12px);
  left: 0;
  z-index: 60;
  min-width: 240px;
  padding: 12px;
  border: 1px solid color-mix(in srgb, var(--outline-variant) 55%, transparent);
  border-radius: var(--radius);
  background: #fff;
  box-shadow:
    0 2px 4px color-mix(in srgb, var(--primary) 4%, transparent),
    0 18px 48px color-mix(in srgb, var(--primary) 12%, transparent);
  display: flex;
  flex-direction: column;
  gap: 2px;
  transform: translateY(8px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.2s cubic-bezier(0.16, 1, 0.3, 1),
    visibility 0.2s;
}

.nav-group__panel[hidden] {
  display: none !important;
}

.nav-group__panel a {
  display: block;
  padding: 14px 18px;
  border: 0;
  border-radius: var(--radius);
  color: var(--on-surface-variant);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, background 0.18s ease;
}

.nav-group__panel a:hover,
.nav-group__panel a:focus-visible,
.nav-group__panel a.is-active {
  color: var(--primary);
  background: color-mix(in srgb, var(--surface-low) 92%, var(--primary-fixed, var(--surface-low)));
}

.nav-group__panel a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 0;
}

.nav-links > a {
  padding: 8px 0 6px;
}

/* Desktop: hover / focus-within open (no click required) */
@media (hover: hover) and (pointer: fine) and (min-width: 768px) {
  .nav-group::after {
    display: block;
  }

  .nav-group__panel[hidden] {
    display: flex !important;
  }

  .nav-group:hover .nav-group__panel,
  .nav-group:focus-within .nav-group__panel,
  .nav-group.is-open .nav-group__panel {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
}

/* Coarse pointer / no-hover: JS toggles .is-open + removes [hidden] */
@media (hover: none), (pointer: coarse) {
  .nav-group.is-open .nav-group__panel:not([hidden]) {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-group__panel,
  .nav-chevron {
    transition: none;
  }
}

/* Mobile accordion */
.mobile-nav {
  display: none;
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: 55;
  background: var(--surface-lowest);
  border-bottom: 1px solid var(--outline-variant);
  box-shadow: 0 16px 32px color-mix(in srgb, var(--primary) 10%, transparent);
  max-height: min(72vh, 560px);
  overflow: auto;
}

.mobile-nav.is-open,
.mobile-nav:not([hidden]) {
  display: block;
}

.mobile-nav[hidden] {
  display: none !important;
}

.mobile-nav__inner {
  display: flex;
  flex-direction: column;
  padding: 8px 16px 20px;
}

.mobile-nav__group {
  border-bottom: 1px solid var(--outline-variant);
}

.mobile-nav__group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 4px;
  list-style: none;
  cursor: pointer;
  color: var(--primary);
  font-size: 15px;
  font-weight: 600;
}

.mobile-nav__group summary::-webkit-details-marker {
  display: none;
}

.mobile-nav__links {
  display: flex;
  flex-direction: column;
  padding: 0 4px 12px;
  gap: 2px;
}

.mobile-nav__links a,
.mobile-nav__inner > a {
  padding: 10px 4px;
  color: var(--on-surface-variant);
  border-bottom: 0;
  font-size: 14px;
}

.mobile-nav__inner > a {
  margin-top: 4px;
  font-weight: 600;
  color: var(--primary);
}

@media (min-width: 768px) {
  .mobile-nav,
  .mobile-nav.is-open,
  .mobile-nav:not([hidden]) {
    display: none !important;
  }
}

@media (max-width: 767px) {
  .nav-group__panel {
    display: none !important;
  }
}