/**
 * CHIMAERA — navigation.css
 *
 * The navigation is NOT an opaque panel.
 * It is a transparent layer sitting directly over the persistent
 * atmosphere canvas.
 *
 * The underlying page is blurred.
 * The atmosphere remains sharp.
 * The navigation links remain sharp.
 */

/* ================================================================
   HEADER
   ================================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;

  z-index: 100;

  display: flex;
  align-items: center;
  justify-content: space-between;

  padding: var(--space-m) var(--page-margin);

  pointer-events: none;

  opacity: 0;

  transition: opacity 400ms var(--ease-editorial);
}

.site-header__wordmark,
.nav-star-button {
  pointer-events: auto;
}

/*
 * Header remains invisible during the opening sequence.
 */

.site-header.header--opening {
  opacity: 0;
}

/*
 * homepage.js adds this when the header should begin appearing.
 */

.site-header.header--revealing {
  opacity: 1;
}

/* ================================================================
   WORDMARK
   ================================================================ */

.site-header__wordmark {
  position: relative;
  display: block;
  width: max-content;
}

/*
 * WORDMARK SIZE
 *
 * This is the primary control for the wordmark size.
 *
 * Increase/decrease this value directly.
 */

.wordmark-img {
  display: block;

  height: 4rem;
  width: auto;

  max-width: none;

  filter: drop-shadow(0 1px 12px rgba(0, 0, 0, 0.16));

  transition: opacity var(--duration-medium) var(--ease-editorial);
  transform: translate(-10px, -30px);
}

/*
 * White version sits directly over the coral version.
 *
 * Absolute positioning is intentional here because the two
 * images are alternative ink versions of the same wordmark.
 */

.wordmark-img--white {
  position: absolute;

  top: 0;
  left: 0;

  width: 100%;
  height: 100%;

  opacity: 0;
}

/* ================================================================
   WORDMARK INK
   ================================================================ */

.site-header__wordmark[data-ink="on-dark"] .wordmark-img--coral {
  opacity: 0;
}

.site-header__wordmark[data-ink="on-dark"] .wordmark-img--white {
  opacity: 1;
}

.site-header__wordmark[data-ink="on-light"] .wordmark-img--coral {
  opacity: 1;
}

.site-header__wordmark[data-ink="on-light"] .wordmark-img--white {
  opacity: 0;
}

/* ================================================================
   NAV TRIGGER
   ================================================================ */

.nav-star-button {
  display: grid;
  place-items: center;

  /*
   * Star size.
   *
   * Change these two values to resize the star.
   */

  width: 9.5rem;
  height: 9.5rem;

  padding: 0;
  margin: 0;

  /*
   * Star position.
   *
   * This is the ONLY independent positioning control for the star.
   *
   * X: positive = right
   * X: negative = left
   *
   * Y: positive = down
   * Y: negative = up
   */

  transform: translate(42px, -25px);

  border: 0;
  background: transparent;

  color: var(--color-white);

  cursor: pointer;

  transition:
    transform var(--duration-medium) var(--ease-editorial),
    color var(--duration-medium) var(--ease-editorial);
}

.nav-star-button__img {
  display: block;

  width: 100%;
  height: 100%;

  object-fit: contain;

  transition:
    transform var(--duration-slow) var(--ease-editorial),
    opacity var(--duration-medium) var(--ease-editorial);
}

/* ================================================================
   NAV TRIGGER — INK
   ================================================================ */

.nav-star-button[data-ink="on-light"] {
  color: var(--color-coral);
}

.nav-star-button[aria-expanded="true"] {
  color: var(--color-white);
}

/*
 * The star is an <img>, so `color` above can't recolour it. Two versions
 * share one grid cell. Computers (mouse/trackpad) always show the coral
 * star, at any window width. Touch screens (phones, tablets) let data-ink
 * pick: white over coral (on-dark, the default) and while the menu is
 * open, coral over a pale field (on-light). Keyed to the input device, not
 * width, so a narrow or zoomed desktop window still gets coral.
 */

.nav-star-button__img {
  grid-area: 1 / 1;
}

.nav-star-button__img--white {
  opacity: 0;
}

@media (hover: none) and (pointer: coarse) {
  .nav-star-button__img--coral {
    opacity: 0;
  }

  .nav-star-button__img--white {
    opacity: 1;
  }

  .nav-star-button[data-ink="on-light"] .nav-star-button__img--coral {
    opacity: 1;
  }

  .nav-star-button[data-ink="on-light"] .nav-star-button__img--white {
    opacity: 0;
  }

  .nav-star-button[aria-expanded="true"] .nav-star-button__img--coral {
    opacity: 0;
  }

  .nav-star-button[aria-expanded="true"] .nav-star-button__img--white {
    opacity: 1;
  }
}

/* ================================================================
   NAV TRIGGER — ROTATION
   ================================================================ */

.nav-star-button[aria-expanded="true"] .nav-star-button__img {
  transform: rotate(135deg);
}

.nav-star-button:hover .nav-star-button__img {
  transform: rotate(35deg);
}

.nav-star-button[aria-expanded="true"]:hover .nav-star-button__img {
  transform: rotate(170deg);
}

/* ================================================================
   BACKDROP
   ================================================================ */

.nav-backdrop {
  position: fixed;
  inset: 0;

  z-index: 90;

  background: transparent !important;
  background-color: transparent !important;

  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);

  opacity: 1;

  pointer-events: none;

  transition:
    backdrop-filter 420ms ease,
    -webkit-backdrop-filter 420ms ease;
}

.nav-backdrop.is-open {
  pointer-events: auto;
}

/* ================================================================
   NAV PANEL
   ================================================================ */

.site-nav {
  position: fixed;

  top: 0;
  left: 0;
  bottom: 0;

  z-index: 95;

  width: min(30rem, 88vw);

  background: transparent !important;
  background-color: transparent !important;

  border: 0 !important;
  box-shadow: none !important;

  color: var(--color-white);

  transform: translateX(-100%);

  transition: transform 900ms var(--ease-editorial);

  overflow-x: hidden;
  overflow-y: auto;

  isolation: isolate;
}

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

/* ================================================================
   NAV INNER
   ================================================================ */

.site-nav__inner {
  position: relative;

  z-index: 2;

  min-height: 100%;

  display: flex;
  flex-direction: column;

  justify-content: center;

  padding: clamp(6rem, 10vh, 9rem) var(--space-xl) var(--space-xl);
}

/* ================================================================
   NAV LINKS
   ================================================================ */

.site-nav__list {
  display: flex;

  flex-direction: column;

  gap: var(--space-l);

  margin: 0;
  padding: 0;

  list-style: none;
}

.site-nav__list li {
  opacity: 0;

  transform: translateX(-1rem);

  transition:
    opacity 650ms var(--ease-editorial),
    transform 650ms var(--ease-editorial);
}

.site-nav.is-open .site-nav__list li {
  opacity: 1;

  transform: translateX(0);
}

/* ================================================================
   NAV LINK STAGGER
   ================================================================ */

.site-nav.is-open .site-nav__list li:nth-child(1) {
  transition-delay: 80ms;
}

.site-nav.is-open .site-nav__list li:nth-child(2) {
  transition-delay: 150ms;
}

.site-nav.is-open .site-nav__list li:nth-child(3) {
  transition-delay: 220ms;
}

.site-nav.is-open .site-nav__list li:nth-child(4) {
  transition-delay: 290ms;
}

.site-nav.is-open .site-nav__list li:nth-child(5) {
  transition-delay: 360ms;
}

/* ================================================================
   LINKS
   ================================================================ */

.site-nav__list a {
  display: inline-block;

  color: inherit;

  font-family: var(--font-display);

  font-weight: 700;

  font-size: var(--step-3);

  line-height: 1;

  text-transform: lowercase;

  text-decoration: none;

  letter-spacing: -0.01em;

  transition:
    opacity 250ms var(--ease-editorial),
    transform 250ms var(--ease-editorial);
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible {
  opacity: 0.7;

  transform: translateX(0.35em);
}

/* ================================================================
   UNDERLYING PAGE
   ================================================================ */

body.nav-open main,
body.nav-open footer {
  filter: blur(14px);

  transition: filter 420ms ease;
}

body.nav-open #page-content {
  filter: blur(14px);

  transition: filter 420ms ease;
}

/* ================================================================
   ATMOSPHERE
   ================================================================ */

body.nav-open #atmosphere-canvas,
body.nav-open .atmosphere,
body.nav-open [data-atmosphere] {
  filter: none !important;
}

/* ================================================================
   REDUCED MOTION
   ================================================================ */

@media (prefers-reduced-motion: reduce) {
  .site-header,
  .site-nav,
  .nav-backdrop,
  .site-nav__list li,
  .site-nav__list a {
    transition: none;
  }

  .site-nav__list li {
    opacity: 1;
    transform: none;
  }

  body.nav-open main,
  body.nav-open footer,
  body.nav-open #page-content {
    filter: blur(8px);
    transition: none;
  }

  .site-nav {
    background: transparent !important;
    background-color: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
  }

  .nav-backdrop {
    background: transparent !important;
    background-color: transparent !important;
    border: 0 !important;
  }

  body.nav-open main,
  body.nav-open footer,
  body.nav-open .site-content {
    filter: blur(14px);
    transition: filter 420ms ease;
  }

  .site-nav,
  .nav-backdrop,
  #atmosphere-canvas {
    filter: none !important;
  }

  .site-nav {
    z-index: 100;
  }

  .nav-backdrop {
    z-index: 90;
  }
}