.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  padding-top: env(safe-area-inset-top, 0px);
}
.nav__inner {
  max-width: calc(var(--max) + 24px);
  margin: 12px auto 0;
  padding: 0 10px 0 22px;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 24px;
  border-radius: 18px;
  transition: background var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out), backdrop-filter var(--dur-med);
  width: calc(100% - 2 * var(--gutter) + 24px);
}
.nav.is-scrolled .nav__inner {
  background: rgba(12, 21, 32, 0.72);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  box-shadow: 0 0 0 1px var(--ink-line), 0 20px 40px -20px rgba(0, 0, 0, 0.6);
}
.nav__brand { color: var(--on-ink); text-decoration: none; }

.nav__links { display: flex; gap: 2px; margin-left: 12px; }
.nav__group { position: relative; }
.nav__trigger {
  display: inline-flex; align-items: center; gap: 8px;
  background: none; border: 0; cursor: pointer;
  height: 40px; padding: 0 14px; border-radius: 10px;
  color: var(--on-ink-muted); font-size: 0.92rem; font-weight: 500;
  transition: color var(--dur-fast), background var(--dur-fast);
}
.nav__trigger svg { transition: transform var(--dur-med) var(--ease-out); }
.nav__trigger:hover, .nav__trigger.is-open { color: var(--on-ink); background: rgba(255, 255, 255, 0.05); }
.nav__trigger.is-open svg { transform: rotate(180deg); }

.nav__menu {
  position: absolute; top: calc(100% + 10px); left: -8px;
  width: 340px; padding: 8px;
  display: grid; gap: 2px;
  border-radius: 18px;
  background: rgba(15, 26, 39, 0.94);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: 0 0 0 1px var(--ink-line-strong), 0 30px 60px -20px rgba(0, 0, 0, 0.7);
  transform-origin: top left;
}
.nav__menu.is-grid { grid-template-columns: 1fr 1fr; width: 320px; }
.nav__menu::before { content: ""; position: absolute; inset: -12px 0 auto; height: 12px; }
.nav__item {
  display: grid; gap: 2px; padding: 12px 14px; border-radius: 12px; text-decoration: none;
  transition: background var(--dur-fast);
}
.nav__item:hover, .nav__item:focus-visible { background: rgba(255, 255, 255, 0.06); }
.nav__itemtitle { font-weight: 550; font-size: 0.94rem; color: var(--on-ink); }
.nav__itemdesc { font-size: 0.82rem; color: var(--on-ink-faint); line-height: 1.4; }

.nav__actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.nav__cta {
  display: inline-flex; align-items: center; height: 42px; padding: 0 18px; border-radius: 12px;
  background: var(--paper-3); color: var(--on-paper); font-weight: 600; font-size: 0.9rem; text-decoration: none;
  transition: transform var(--dur-fast), box-shadow var(--dur-med);
}
.nav__cta:hover { box-shadow: 0 10px 30px -10px rgba(255, 255, 255, 0.5); }
.nav__cta:active { transform: scale(0.97); }

.nav__burger { display: none; width: 44px; height: 44px; border: 0; border-radius: 12px; background: rgba(255, 255, 255, 0.07); cursor: pointer; position: relative; }
.nav__burger span, .nav__burger span::before { position: absolute; left: 13px; right: 13px; height: 1.6px; border-radius: 2px; background: var(--on-ink); transition: transform var(--dur-med) var(--ease-out), top var(--dur-med); }
.nav__burger span { top: 17px; }
.nav__burger span::before { content: ""; left: 0; right: 0; top: 8px; }
.nav__burger span.is-x { top: 21px; transform: rotate(45deg); }
.nav__burger span.is-x::before { top: 0; transform: rotate(-90deg); }

.nav__sheet {
  position: fixed; inset: 0; z-index: -1;
  background: rgba(7, 13, 20, 0.97);
  backdrop-filter: blur(20px);
  padding: calc(96px + env(safe-area-inset-top, 0px)) var(--gutter) calc(32px + env(safe-area-inset-bottom, 0px));
  overflow-y: auto;
}
.nav__sheetinner { display: grid; gap: 4px; }
.nav__acc { border-bottom: 1px solid var(--ink-line); }
.nav__acc summary {
  list-style: none; cursor: pointer; padding: 18px 0;
  font-family: var(--font-display); font-size: 1.9rem; font-weight: 600; letter-spacing: -0.03em;
  display: flex; justify-content: space-between; align-items: center;
}
.nav__acc summary::-webkit-details-marker { display: none; }
.nav__acc summary::after { content: "+"; font-weight: 300; color: var(--on-ink-faint); transition: transform var(--dur-med); }
.nav__acc[open] summary::after { transform: rotate(45deg); }
.nav__acc div { display: grid; padding: 0 0 18px; }
.nav__acc a { padding: 10px 0; color: var(--on-ink-muted); text-decoration: none; font-size: 1.05rem; }
.nav__sheetcta {
  margin-top: 28px; display: flex; justify-content: center; align-items: center; height: 56px; border-radius: 16px;
  background: var(--accent); color: var(--on-accent); font-weight: 600; text-decoration: none;
}

@media (max-width: 1040px) {
  .nav__links { display: none; }
  .nav__burger { display: block; }
}
@media (max-width: 520px) {
  .nav__cta { display: none; }
  .nav__inner { padding: 0 8px 0 18px; margin-top: 8px; }
}