/* ========================================================================
   Top navigation — minimal, editorial, sticky on desktop
   ======================================================================== */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 500;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: transparent;
  backdrop-filter: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease-editorial), background var(--dur-base) var(--ease-editorial), backdrop-filter var(--dur-base) var(--ease-editorial);
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--dur-slow) var(--ease-editorial), transform var(--dur-slow) var(--ease-editorial);
  pointer-events: none;
}

.site-nav.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.site-nav.is-scrolled {
  background: transparent;
  border-bottom-color: var(--color-border);
}

/* ---- Scrolled-state surface: a soft, matte, faintly "silicone" purple
   panel instead of a flat beige/glass bar. Two layers:
   ::before is the surface itself — a base lilac wash plus two large,
   very soft highlight blobs (one warm-white, one accent-purple) that
   drift slowly via background-position, giving the impression of light
   moving inside the material rather than an obvious animated gradient.
   ::after is a barely-there noise texture (mix-blend: overlay) that
   breaks up the flatness for a tactile, non-glossy finish. Both sit
   behind .site-nav__inner (promoted below) so text stays fully legible. ---- */
.site-nav::before,
.site-nav::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-editorial);
}

.site-nav::before {
  background:
    radial-gradient(48% 160% at 12% 25%, rgba(255, 255, 255, 0.6), transparent 60%),
    radial-gradient(46% 170% at 88% 78%, rgba(122, 129, 255, 0.38), transparent 65%),
    linear-gradient(120deg, #eeecfa 0%, #e3ddf5 38%, #d9d2ef 68%, #e8e4f8 100%);
  background-size: 200% 200%, 200% 200%, 200% 200%;
  background-position: 0% 50%, 100% 50%, 0% 50%;
  animation: nav-surface-breathe 26s var(--ease-editorial) infinite alternate;
}

.site-nav::after {
  z-index: 1;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
  mix-blend-mode: overlay;
}

.site-nav.is-scrolled::before { opacity: 1; }
.site-nav.is-scrolled::after { opacity: 0.05; }

@keyframes nav-surface-breathe {
  0% { background-position: 0% 45%, 100% 55%, 0% 50%; }
  100% { background-position: 12% 58%, 88% 40%, 20% 55%; }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav::before { animation: none; }
}

.site-nav__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-3);
}

.site-nav__mark {
  font-family: var(--font-display);
  /* Thinner, smaller, airier — ~18% down, weight cut from 800 to 500,
     tracking opened up to --ls-wider so the name reads light rather
     than heavier than the nav links next to it (FFF-style editorial
     header). .opening-title mirrors weight/tracking so its shrink-into-
     place animation still lands on a matching mark, not a weight jump. */
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  flex-shrink: 0;
  margin-right: auto;
}

/* ---- Opening title: MARINA KAZAKOVA appears large and centered, then
   flies/shrinks into the header mark's exact position (see
   js/opening-animation.js). Same font/weight/tracking as .site-nav__mark
   throughout — only size and position animate, for a seamless morph. */
body.is-opening { overflow: hidden; }

.opening-title {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 900;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.8rem, 1.2rem + 3vw, 3.8rem);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  color: var(--color-black);
  white-space: nowrap;
  opacity: 0;
  transform: translate(var(--tx, 0px), var(--ty, 0px)) scale(var(--s, 1));
  transition: opacity 350ms ease;
}

.opening-title.is-visible { opacity: 1; }

.opening-title.is-flying {
  transition: opacity 350ms ease, transform 600ms var(--ease-editorial);
}

.opening-title.is-done {
  opacity: 0;
  transition: opacity 200ms ease;
  pointer-events: none;
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 1.5vw, 2.25rem);
}

.site-nav__link {
  /* ~17% down from --fs-small, weight cut from 600 to 500, tracking
     opened up to --ls-wider — thinner, more compact, airier reading
     (nav bar height/layout untouched, only the type inside it). */
  font-size: clamp(0.65rem, 0.63rem + 0.08vw, 0.73rem);
  font-weight: 500;
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  color: var(--color-text);
  opacity: 0.62;
  position: relative;
  padding-block: 0.35em;
  transition: opacity var(--dur-fast) var(--ease-editorial);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--color-accent);
  transition: right var(--dur-base) var(--ease-editorial);
}

.site-nav__link:hover,
.site-nav__link.is-active {
  opacity: 1;
}
.site-nav__link:hover::after,
.site-nav__link.is-active::after {
  right: 0;
}

.site-nav__right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ---- Language: a small segmented pill toggle (FFF-style) instead of a
   plain "EN / RU" text pair — the active language sits inside its own
   soft, translucent rounded chip. ---- */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border-radius: 999px;
  background: rgba(11, 11, 12, 0.06);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: var(--ls-wider);
}

.lang-switch__btn {
  padding: 0.35em 0.7em;
  border-radius: 999px;
  color: var(--color-black);
  opacity: 0.45;
  transition: opacity var(--dur-fast) var(--ease-editorial), background var(--dur-fast) var(--ease-editorial);
}
.lang-switch__btn.is-active {
  opacity: 1;
  background: rgba(255, 255, 255, 0.85);
}
.lang-switch__btn:hover { opacity: 0.8; }

.site-nav.is-scrolled .lang-switch { background: rgba(11, 11, 12, 0.08); }

/* ---- Music toggle: small, round, quiet — a placeholder control until
   audio is wired up. Purely visual state for now (no autoplay). ---- */
.music-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: none;
  color: var(--color-black);
  opacity: 0.5;
  transition: opacity var(--dur-fast) var(--ease-editorial), border-color var(--dur-fast) var(--ease-editorial), color var(--dur-fast) var(--ease-editorial), background var(--dur-fast) var(--ease-editorial);
}
.music-toggle:hover {
  opacity: 1;
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.music-toggle[aria-pressed="true"] {
  opacity: 1;
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(122, 129, 255, 0.12);
}
.music-toggle__icon {
  font-size: 0.75rem;
  line-height: 1;
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 26px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-black);
  transition: transform var(--dur-base) var(--ease-editorial), opacity var(--dur-base) var(--ease-editorial);
}

@media (max-width: 760px) {
  .site-nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-offwhite);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    padding: var(--space-3) var(--container-pad) var(--space-4);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-base) var(--ease-editorial), transform var(--dur-base) var(--ease-editorial);
    border-bottom: 1px solid var(--color-border);
  }
  .site-nav__links.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .nav-toggle { display: flex; }
  .nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.is-open span:nth-child(2) { opacity: 0; }
  .nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}