/*
 * Proposal C — navigation components.
 *
 * One markup shape (.c-nav) is shared by the mobile drawer, the desktop rail
 * and the footer sitemap, so the three navigations stay visually consistent.
 * Loaded after proposal-c.css and only overrides navigation chrome.
 */

/* ---------------------------------------------------------------- shared */

.c-nav {
  display: grid;
  gap: 1.35rem;
}

.c-nav__group-title {
  display: flex;
  gap: .5rem;
  align-items: center;
  margin: 0 0 .5rem;
  color: var(--color-muted);
  font-size: .625rem;
  font-weight: 700;
  letter-spacing: .16em;
}

.c-nav__group-title::after {
  flex: 1;
  height: 1px;
  background: var(--color-line);
  content: "";
}

.c-nav__list {
  display: grid;
  gap: .25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.c-nav__link {
  display: grid;
  grid-template-columns: 1.75rem 1fr auto;
  gap: .65rem;
  align-items: center;
  min-height: 2.9rem;
  padding: .5rem .75rem;
  color: var(--color-ink);
  border: 1px solid transparent;
  border-radius: .8rem;
  text-decoration: none;
  transition: background 200ms ease-out, border-color 200ms ease-out, transform 200ms ease-out;
}

.c-nav__number {
  color: var(--color-brand);
  font-size: .625rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: .06em;
}

.c-nav__text {
  display: grid;
  gap: .1rem;
  min-width: 0;
}

.c-nav__label {
  font-size: .9rem;
  font-weight: 700;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.c-nav__en {
  color: var(--color-muted);
  font-size: .5625rem;
  font-weight: 700;
  letter-spacing: .12em;
}

.c-nav__arrow {
  color: var(--color-muted);
  font-size: .75rem;
  transition: transform 200ms ease-out, color 200ms ease-out;
}

.c-nav__link:hover,
.c-nav__link:focus-visible {
  background: color-mix(in srgb, var(--color-brand) 8%, var(--color-base));
  border-color: color-mix(in srgb, var(--color-brand) 24%, transparent);
}

.c-nav__link:hover .c-nav__arrow,
.c-nav__link:focus-visible .c-nav__arrow {
  color: var(--color-brand-deep);
  transform: translateX(.15rem);
}

.c-nav__link.is-current {
  background: color-mix(in srgb, var(--color-brand) 12%, var(--color-base));
  border-color: color-mix(in srgb, var(--color-brand) 38%, transparent);
}

.c-nav__link.is-current .c-nav__arrow {
  color: var(--color-brand-deep);
}

/* ------------------------------------------------------- mobile header */

.c-header__name a {
  display: flex;
  gap: .5rem;
  align-items: center;
  /* Lets the wordmark shrink with the header instead of overrunning it. */
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.c-menu-button {
  gap: .5rem;
  min-width: 2.75rem;
  min-height: 2.75rem;
  border: 1px solid var(--color-line);
  border-radius: .7rem;
  transition: background 200ms ease-out, border-color 200ms ease-out;
}

.c-menu-button__label {
  font-size: .625rem;
  font-weight: 700;
  letter-spacing: .12em;
}

.c-menu-button:hover,
.c-menu-button:focus-visible {
  background: color-mix(in srgb, var(--color-brand) 8%, var(--color-base));
  border-color: color-mix(in srgb, var(--color-brand) 32%, transparent);
}

.c-menu-button[aria-expanded="true"] {
  color: var(--color-base);
  background: var(--color-ink);
  border-color: var(--color-ink);
}

/* ------------------------------------------------------- mobile drawer */

.c-mobile-menu {
  padding: 0 !important;
  background: transparent !important;
  border: 0 !important;
  box-shadow: none !important;
}

.c-mobile-menu__inner {
  display: grid;
  gap: 1.25rem;
  width: min(100%, 24.375rem);
  margin-inline: auto;
  padding: 1.25rem clamp(.9rem, 4vw, 1.25rem) 1.75rem;
  background: var(--color-base);
  border-block-end: .35rem solid var(--color-brand);
  border-radius: 0 0 1.75rem 1.75rem;
  box-shadow: 0 1.2rem 2.5rem color-mix(in srgb, var(--color-ink) 18%, transparent);
}

.c-mobile-menu__heading {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin: 0;
}

.c-mobile-menu__eyebrow {
  margin: 0;
  color: var(--color-muted);
  font-size: .625rem;
  font-weight: 700;
  letter-spacing: .16em;
}

.c-mobile-menu__close {
  display: grid;
  width: 2.75rem;
  height: 2.75rem;
  place-items: center;
  color: var(--color-ink);
  background: var(--color-base);
  border: 1px solid var(--color-line);
  border-radius: 50%;
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  transition: background 200ms ease-out, border-color 200ms ease-out;
}

.c-mobile-menu__close:hover,
.c-mobile-menu__close:focus-visible {
  background: color-mix(in srgb, var(--color-brand) 10%, var(--color-base));
  border-color: color-mix(in srgb, var(--color-brand) 34%, transparent);
}

.c-mobile-menu__foot {
  display: grid;
  gap: .55rem;
  padding-block-start: 1rem;
  border-block-start: 1px solid var(--color-line);
}

.c-mobile-menu__lead {
  margin: 0;
  color: var(--color-muted);
  font-size: .6875rem;
  line-height: 1.6;
}

.c-mobile-menu__foot .c-menu-cta {
  display: flex;
  gap: .5rem;
  align-items: center;
  justify-content: space-between;
  min-height: 2.9rem;
  margin-block-start: 0;
  padding: .75rem 1rem;
  color: var(--color-ink);
  background: var(--color-accent);
  border: 1px solid var(--color-accent-line);
  border-radius: .8rem;
  font-size: .875rem;
  font-weight: 700;
  text-decoration: none;
}

.c-mobile-menu__foot .c-menu-cta.is-unavailable {
  color: var(--color-muted);
  background: color-mix(in srgb, var(--color-line) 40%, var(--color-base));
  border-color: var(--color-line);
}

/* Each drawer group fades in slightly after the one above it. */
.c-mobile-menu.is-open .c-nav__group {
  animation: c-nav-in 320ms ease-out both;
}

.c-mobile-menu.is-open .c-nav__group:nth-child(2) { animation-delay: 60ms; }
.c-mobile-menu.is-open .c-nav__group:nth-child(3) { animation-delay: 120ms; }

@keyframes c-nav-in {
  from { opacity: 0; transform: translateY(.4rem); }
  to   { opacity: 1; transform: none; }
}

/* Hold the page still while the drawer is open. */
body.menu-open {
  overflow: hidden;
  touch-action: none;
}

/* ---------------------------------------------------------- footer nav */

.c-footer__brand {
  display: flex;
  gap: .6rem;
  align-items: center;
  margin-block-end: 1.35rem;
}

.c-footer__nav {
  margin-block-end: 1.35rem;
}

/* The footer sits on the ink background, so the shared nav flips to light. */
.c-footer .c-nav {
  gap: 1.1rem;
}

.c-footer .c-nav__group-title {
  color: color-mix(in srgb, var(--color-base) 62%, transparent);
}

.c-footer .c-nav__group-title::after {
  background: color-mix(in srgb, var(--color-base) 22%, transparent);
}

.c-footer .c-nav__list {
  gap: .1rem;
}

.c-footer .c-nav__link {
  min-height: 2.4rem;
  padding: .35rem .5rem;
  color: var(--color-base);
  border-radius: .55rem;
}

.c-footer .c-nav__number {
  color: color-mix(in srgb, var(--color-accent) 92%, transparent);
}

.c-footer .c-nav__label {
  font-size: .8125rem;
}

.c-footer .c-nav__en,
.c-footer .c-nav__arrow {
  color: color-mix(in srgb, var(--color-base) 58%, transparent);
}

.c-footer .c-nav__link:hover,
.c-footer .c-nav__link:focus-visible {
  background: color-mix(in srgb, var(--color-base) 12%, transparent);
  border-color: color-mix(in srgb, var(--color-base) 26%, transparent);
}

.c-footer .c-nav__link.is-current {
  background: color-mix(in srgb, var(--color-base) 16%, transparent);
  border-color: color-mix(in srgb, var(--color-accent) 55%, transparent);
}

.c-footer__cta {
  margin-block-end: 1.35rem;
}

.c-footer__cta .c-menu-cta {
  display: flex;
  gap: .5rem;
  align-items: center;
  justify-content: space-between;
  min-height: 2.9rem;
  padding: .7rem 1rem;
  color: var(--color-ink);
  background: var(--color-accent);
  border: 1px solid var(--color-accent-line);
  border-radius: .8rem;
  font-size: .8125rem;
  font-weight: 700;
  text-decoration: none;
}

.c-footer__meta {
  padding-block-start: 1.1rem;
  border-block-start: 1px solid color-mix(in srgb, var(--color-base) 22%, transparent);
}

.c-footer__copyright {
  margin-block-start: .9rem;
  color: color-mix(in srgb, var(--color-base) 62%, transparent);
  font-size: .6875rem !important;
}

/* -------------------------------------------------- desktop rail (PC) */

@media (min-width: 68.75rem) {
  .c-rail {
    gap: 1rem;
    padding: 1.1rem .7rem 1.25rem;
    overflow-y: auto;
  }

  .c-rail__head {
    flex: none;
  }

  .c-rail__brand {
    display: grid;
    gap: .45rem;
    justify-items: start;
    color: inherit;
    text-decoration: none;
  }

  .c-rail__mark {
    display: grid;
    width: 2rem;
    height: 2rem;
    place-items: center;
    color: var(--color-base);
    background: var(--color-ink);
    border-radius: .6rem;
    font-size: .9rem;
    font-weight: 700;
  }

  .c-rail__brand-text {
    font-size: .625rem;
    font-weight: 700;
    letter-spacing: .14em;
    line-height: 1.35;
  }

  .c-rail__nav {
    flex: 1;
    min-height: 0;
    margin-block: auto;
  }

  .c-rail .c-nav {
    gap: .9rem;
  }

  .c-rail .c-nav__group-title {
    margin-block-end: .3rem;
    font-size: .5625rem;
    letter-spacing: .14em;
  }

  .c-rail .c-nav__link {
    grid-template-columns: 1fr auto;
    gap: .35rem;
    min-height: 2.35rem;
    padding: .35rem .45rem;
    border-radius: .6rem;
  }

  /* The rail is only 200px wide, so the index number is dropped there. */
  .c-rail .c-nav__number {
    display: none;
  }

  .c-rail .c-nav__label {
    font-size: .75rem;
  }

  .c-rail .c-nav__en {
    font-size: .5rem;
  }

  .c-rail__foot {
    flex: none;
    padding-block-start: .75rem;
    border-block-start: 1px solid var(--color-line);
  }

  .c-rail__foot .c-menu-cta {
    display: flex;
    gap: .35rem;
    align-items: center;
    justify-content: space-between;
    min-height: 2.75rem;
    padding: .65rem .6rem;
    color: var(--color-ink);
    background: var(--color-accent);
    border: 1px solid var(--color-accent-line);
    border-radius: .8rem;
    font-size: .75rem;
    font-weight: 700;
    text-decoration: none;
  }

  /* On TOP only, the footer sitemap would duplicate the right rail.
     Lower pages have no rail, so their footer sitemap stays visible. */
  .shell-c--top .c-footer__nav,
  .shell-c--top .c-footer__cta {
    display: none;
  }

  .shell-c--top .c-footer__brand {
    margin-block-end: 1rem;
  }

  .shell-c--top .c-footer__meta {
    padding-block-start: 0;
    border-block-start: 0;
  }
}

/* --------------------------------------------------------- reduced motion */

@media (prefers-reduced-motion: reduce) {
  .c-nav__link,
  .c-nav__arrow,
  .c-menu-button,
  .c-mobile-menu__close {
    transition: none !important;
  }

  .c-mobile-menu.is-open .c-nav__group {
    animation: none !important;
  }
}