.nav {
  --nav-glass: 0;
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  padding-block: 0.9rem;
  isolation: isolate;
  background: linear-gradient(
    to bottom,
    color-mix(in oklab, oklch(32% 0.02 270 / 0.3) calc(var(--nav-glass) * 100%), oklch(60% 0.02 270 / 0.04)),
    color-mix(in oklab, oklch(16% 0.02 270 / 0.22) calc(var(--nav-glass) * 100%), oklch(20% 0.02 270 / 0.02))
  );
  backdrop-filter: blur(8px)
                   saturate(calc(125% + 75% * var(--nav-glass)))
                   contrast(calc(1 + 0.18 * var(--nav-glass)))
                   brightness(calc(1 + 0.05 * var(--nav-glass)));
  -webkit-backdrop-filter: blur(8px)
                   saturate(calc(125% + 75% * var(--nav-glass)))
                   contrast(calc(1 + 0.18 * var(--nav-glass)))
                   brightness(calc(1 + 0.05 * var(--nav-glass)));
  border-bottom: 1px solid oklch(80% 0.02 270 / calc(0.14 * var(--nav-glass)));
  box-shadow:
    inset 0 1px 0 0 oklch(100% 0 0 / calc(0.22 * var(--nav-glass))),
    inset 0 -1px 0 0 oklch(0% 0 0 / calc(0.2 * var(--nav-glass))),
    0 10px 34px -12px oklch(0% 0 0 / calc(0.55 * var(--nav-glass)));
}

.nav::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    linear-gradient(
      to bottom,
      oklch(100% 0 0 / 0.1) 0%,
      oklch(100% 0 0 / 0) 45%
    ),
    radial-gradient(
      120% 180% at 18% -40%,
      oklch(100% 0 0 / 0.12),
      transparent 60%
    );
  opacity: calc(0.5 + 0.5 * var(--nav-glass));
}

.nav::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background: linear-gradient(
    to bottom,
    oklch(10% 0.02 270 / 0.34) 0%,
    oklch(10% 0.02 270 / 0) 78%
  );
  opacity: var(--nav-glass);
}

.nav__chroma {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: calc(0.95 * var(--nav-glass));
  backdrop-filter: blur(5px) saturate(235%) contrast(1.3) url(#grom-glass);
  -webkit-backdrop-filter: blur(5px) saturate(235%) contrast(1.3) url(#grom-glass);
}

.nav__chroma-def {
  position: absolute;
  width: 0;
  height: 0;
  pointer-events: none;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav__brand {
  position: relative;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
  font-size: 1.35rem;
  display: inline-flex;
  align-items: baseline;
}

.nav__brand:hover { color: var(--color-text); }

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 0.6rem + 1vw, 2rem);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
}

.nav__list a {
  position: relative;
  padding-block: 0.25rem;
  color: var(--color-muted);
}

.nav__list a:hover { color: var(--color-text); }

.nav__cta {
  padding: 0.55rem 1.1rem;
  font-size: var(--text-sm);
}

.nav__list a.nav__cta,
.nav__list a.nav__cta:hover {
  color: var(--btn-fg);
}

.nav__burger {
  display: none;
  width: 38px;
  height: 38px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-line);
  padding: 0 9px;
}

.nav__burger span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--duration-fast) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
}

@media (max-width: 880px) {
  .nav { padding-block: 0.55rem; }

  .nav__burger {
    display: flex;
    position: relative;
    z-index: 1;
    width: 44px;
    height: 44px;
    margin-right: -10px;
    padding: 0 10px;
    border: 0;
  }

  .nav__brand { z-index: 1; }

  .nav__list {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 0;
    height: 100vh;
    height: 100dvh;
    overflow-y: auto;
    overscroll-behavior: contain;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 0;
    padding: calc(4.5rem + env(safe-area-inset-top)) var(--gutter)
             calc(2rem + env(safe-area-inset-bottom));
    background:
      radial-gradient(90% 55% at 0% 0%, color-mix(in oklch, var(--color-accent) 16%, transparent), transparent 70%),
      oklch(12% 0.02 270 / 0.97);
    font-size: 1rem;
    letter-spacing: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-base) var(--ease-out),
                visibility 0s var(--duration-base);
  }

  .nav.is-open .nav__list {
    opacity: 1;
    visibility: visible;
    transition: opacity var(--duration-base) var(--ease-out);
  }

  .nav__list a:not(.nav__cta) {
    display: block;
    padding: 0.3rem 0;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2rem, 1.2rem + 5vw, 3rem);
    line-height: 1.05;
    letter-spacing: -0.03em;
    color: var(--color-text);
    transform: translateY(0.6rem);
    opacity: 0;
    transition: opacity var(--duration-base) var(--ease-out),
                transform var(--duration-base) var(--ease-out),
                color var(--duration-fast) var(--ease-out);
  }

  .nav__list a:not(.nav__cta):hover,
  .nav__list a:not(.nav__cta):focus-visible {
    color: var(--color-accent);
  }

  .nav.is-open .nav__list a:not(.nav__cta) {
    transform: none;
    opacity: 1;
  }

  .nav.is-open .nav__list a:nth-child(2) { transition-delay: 30ms; }
  .nav.is-open .nav__list a:nth-child(3) { transition-delay: 60ms; }
  .nav.is-open .nav__list a:nth-child(4) { transition-delay: 90ms; }
  .nav.is-open .nav__list a:nth-child(5) { transition-delay: 120ms; }
  .nav.is-open .nav__list a:nth-child(6) { transition-delay: 150ms; }
  .nav.is-open .nav__list a:nth-child(7) { transition-delay: 180ms; }

  .nav__list .nav__cta {
    align-self: stretch;
    margin-top: auto;
    padding: 1rem 1.5rem;
    font-size: 1.05rem;
  }

  .nav__list .roar-toggle {
    align-self: center;
    margin-top: 1.25rem;
  }

  :root.nav-open { overflow: hidden; }

  .nav.is-open .nav__burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav.is-open .nav__burger span:nth-child(2) { opacity: 0; }
  .nav.is-open .nav__burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

@media (max-width: 880px) and (prefers-reduced-motion: reduce) {
  .nav__list a:not(.nav__cta) { transform: none; }
}