/* ==========================================================================
   Навигация: чёрная стеклянная панель, выезжающий ряд пунктов, меню, поиск
   Панель всегда тёмная (стекло поверх видео/контента), не зависит от темы.
   ========================================================================== */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--nav-z);
  --nav-fg: #ffffff;
  --nav-fg-dim: rgba(255, 255, 255, 0.66);
  --nav-glass: rgba(10, 10, 10, 0.55);
  --nav-hairline: rgba(255, 255, 255, 0.12);
}

/* --- Верхняя строка (бар) --- */
.nav__bar {
  position: relative;
  z-index: 2;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: clamp(var(--space-xs), 3vw, var(--space-m));
  background: var(--nav-glass);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid transparent;
  color: var(--nav-fg);
  transition: background-color var(--dur-base) var(--ease-fade),
    border-color var(--dur-base) var(--ease-fade);
}

.nav.is-scrolled .nav__bar {
  --nav-glass: rgba(10, 10, 10, 0.72);
  border-bottom-color: var(--nav-hairline);
}

.nav__side {
  display: flex;
  align-items: center;
  gap: var(--space-3xs);
  flex: 1;
}
.nav__side--right {
  justify-content: flex-end;
}

/* --- Логотип по центру (всегда белый) --- */
.nav__logo {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: inline-flex;
  align-items: center;
}
.nav__logo img {
  height: 26px;
  width: auto;
  filter: brightness(0) saturate(100%) invert(1);
}

/* --- Кнопки бара --- */
.nav__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xxs);
  height: 40px;
  min-width: 40px;
  padding-inline: var(--space-xxs);
  border-radius: var(--radius-m);
  color: var(--nav-fg);
  transition: background-color var(--dur-fast) var(--ease-fade);
}
.nav__btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--nav-fg);
}
.nav__btn:active {
  background: rgba(255, 255, 255, 0.16);
}
.nav__btn svg {
  width: 20px;
  height: 20px;
  flex: none;
}

/* Переключатель темы */
.nav__theme .icon-moon {
  display: none;
}
:root[data-theme="dark"] .nav__theme .icon-sun {
  display: none;
}
:root[data-theme="dark"] .nav__theme .icon-moon {
  display: block;
}

/* Бургер — только для мобильных */
.nav__burger-btn {
  display: none;
}

/* ==========================================================================
   Выезжающий ряд пунктов (десктоп)
   ========================================================================== */
.nav__reveal {
  position: absolute;
  top: var(--nav-height);
  left: 0;
  right: 0;
  z-index: 1;
  overflow: hidden;
  pointer-events: none;
}
.nav__reveal-inner {
  pointer-events: auto;
  background: var(--nav-glass);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid var(--nav-hairline);
  transform: translateY(-101%);
  transition: transform var(--dur-slow) var(--ease-move);
  will-change: transform;
}
.nav.is-expanded .nav__reveal-inner {
  transform: translateY(0);
}

.nav__links {
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: clamp(var(--space-s), 3vw, var(--space-xl));
  height: 52px;
  padding-inline: var(--space-m);
}
.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-text);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--nav-fg-dim);
  transition: color var(--dur-base) var(--ease-fade);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 12px;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-base) var(--ease-move);
}
.nav__link:hover,
.nav__link.is-active {
  color: var(--nav-fg);
}
.nav__link:hover::after,
.nav__link.is-active::after {
  transform: scaleX(1);
}

/* ==========================================================================
   Backdrop для оверлеев
   ========================================================================== */
.overlay-backdrop {
  position: fixed;
  inset: 0;
  z-index: calc(var(--nav-z) + 10);
  background: var(--overlay);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-base) var(--ease-fade),
    visibility var(--dur-base) var(--ease-fade);
}
.overlay-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

/* ==========================================================================
   Выдвижное меню (мобильные)
   ========================================================================== */
.menu-panel {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: calc(var(--nav-z) + 20);
  width: min(440px, 100%);
  background: var(--bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  visibility: hidden;
  transition: transform var(--dur-slow) var(--ease-move),
    visibility var(--dur-slow) var(--ease-move);
  will-change: transform;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.menu-panel.is-open {
  transform: translateX(0);
  visibility: visible;
}
.menu-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding-inline: clamp(var(--space-xs), 3vw, var(--space-m));
  border-bottom: 1px solid var(--border);
  flex: none;
}
.menu-panel__title {
  font-family: var(--font-text);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.menu-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-m);
  color: var(--text);
  transition: background-color var(--dur-fast) var(--ease-fade);
}
.menu-close:hover {
  background: color-mix(in srgb, var(--text) 8%, transparent);
}
.menu-close svg {
  width: 22px;
  height: 22px;
}
.menu-panel__body {
  padding: clamp(var(--space-s), 3vw, var(--space-l))
    clamp(var(--space-xs), 3vw, var(--space-m));
}
.menu-nav {
  display: flex;
  flex-direction: column;
}
.menu-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-xs);
  font-family: var(--font-title);
  font-size: clamp(1.6rem, 1.2rem + 1.4vw, 2.1rem);
  font-weight: 700;
  border-bottom: 1px solid var(--border);
}
.menu-nav__link .arrow {
  width: 22px;
  height: 22px;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity var(--dur-base) var(--ease-move),
    transform var(--dur-base) var(--ease-move);
}
.menu-nav__link:hover .arrow {
  opacity: 1;
  transform: translateX(0);
}
.menu-panel__foot {
  margin-top: auto;
  padding: clamp(var(--space-xs), 3vw, var(--space-m));
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3xs);
  color: var(--text-muted);
  font-size: 0.9rem;
}
.menu-panel__foot a:hover {
  color: var(--text);
}

/* ==========================================================================
   Адаптив
   ========================================================================== */
@media (max-width: 900px) {
  /* На мобильных прячем выезжающий ряд, показываем бургер */
  .nav__reveal {
    display: none;
  }
  .nav__burger-btn {
    display: inline-flex;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav__reveal-inner,
  .menu-panel,
  .overlay-backdrop,
  .nav__link::after {
    transition-duration: 0.01ms;
  }
}