.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(11, 12, 11, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition:
    border-color var(--dur-normal) ease,
    background-color var(--dur-normal) ease;
}

.site-header.is-stuck {
  border-bottom-color: var(--line);
  background: rgba(8, 9, 8, 0.9);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  min-height: var(--header-h);
}

/* --- brand --- */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}

.brand__mark {
  width: 34px;
  height: 34px;
  transition: transform var(--dur-normal) var(--ease-out-expo);
}

.brand:hover .brand__mark {
  transform: rotate(-8deg) scale(1.08);
}

.brand__word {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.01em;
}

/* --- links --- */

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 0.2rem + 2vw, 2.4rem);
}

.site-nav__link {
  position: relative;
  font-size: 1.0625rem;
  color: var(--text-dim);
  padding-block: 0.35rem;
  transition: color var(--dur-fast) ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--lime);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-normal) var(--ease-out-expo);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--text);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after {
  transform: scaleX(1);
}

.site-header__cta {
  padding: 0.8rem 1.6rem;
  font-size: 1.0625rem;
}

/* --- mobile --- */

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  align-items: center;
  justify-content: center;
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--dur-normal) var(--ease-out-expo);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
}

.nav-toggle__bars::before {
  transform: translateY(-6px);
}

.nav-toggle__bars::after {
  transform: translateY(6px);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  transform: rotate(-45deg);
}

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
    position: relative;
  }

  .site-header__inner > .site-nav,
  .site-header__inner > .site-header__cta {
    display: none;
  }

  .mobile-panel {
    display: grid;
    gap: var(--space-4);
    padding: 0 var(--gutter) var(--space-6);
    border-top: 1px solid var(--line);
    background: var(--ink-900);
  }

  .mobile-panel[hidden] {
    display: none;
  }

  .mobile-panel .site-nav {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: var(--space-2);
  }

  .mobile-panel .site-nav__link {
    padding-block: 0.9rem;
    border-bottom: 1px solid var(--line);
    font-size: 1.15rem;
  }

  .mobile-panel .site-nav__link::after {
    display: none;
  }

  .mobile-panel .btn {
    width: 100%;
  }
}

@media (min-width: 861px) {
  .mobile-panel {
    display: none;
  }
}