.mobile-nav-toggle,
.mobile-nav-panel {
  display: none;
}

.mobile-nav-toggle {
  position: absolute;
  top: 50%;
  right: max(24px, calc((100vw - var(--shell)) / 2));
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0;
  transform: translateY(-50%);
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.025);
  color: var(--text);
  cursor: pointer;
}

.mobile-nav-toggle:hover {
  border-color: rgba(210, 230, 238, 0.34);
  background: rgba(255, 255, 255, 0.05);
}

.mobile-nav-icon {
  display: grid;
  width: 18px;
  gap: 4px;
}

.mobile-nav-icon span {
  display: block;
  width: 100%;
  height: 1.5px;
  border-radius: 999px;
  background: currentColor;
  transition:
    transform 160ms ease,
    opacity 160ms ease;
}

.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-icon span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-icon span:nth-child(2) {
  opacity: 0;
}

.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-icon span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

.mobile-nav-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: max(24px, calc((100vw - var(--shell)) / 2));
  z-index: 70;
  width: min(420px, calc(100vw - 48px));
  max-height: calc(100vh - 108px);
  overflow-y: auto;
  padding: 12px;
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  background: rgba(7, 14, 19, 0.98);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.46);
  backdrop-filter: blur(20px);
}

.mobile-nav-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 10px 12px;
  border-bottom: 1px solid var(--line);
}

.mobile-nav-panel-header strong {
  font-size: 0.82rem;
  letter-spacing: -0.01em;
}

.mobile-nav-panel-header span {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.mobile-nav-links {
  display: grid;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.mobile-nav-links a {
  display: flex;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 10px;
  border-radius: 9px;
  color: var(--text-soft);
  font-size: 0.9rem;
  transition:
    background 160ms ease,
    color 160ms ease;
}

.mobile-nav-links a::after {
  color: var(--text-muted);
  content: "↘";
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.mobile-nav-links a:hover,
.mobile-nav-links a:focus-visible {
  background: rgba(168, 245, 208, 0.055);
  color: var(--text);
}

@media (max-width: 980px) {
  /* Progressive-enhancement fallback: if navigation.js is unavailable, keep
   * the canonical primary navigation visible and touch-sized instead of
   * leaving tablet/mobile users without any navigation surface. */
  html:not(.js-nav) .nav-shell {
    grid-template-columns: 1fr;
    gap: 8px;
    padding-block: 10px;
  }

  html:not(.js-nav) .site-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 4px 18px;
  }

  html:not(.js-nav) .site-nav a {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
  }

  html.js-nav .mobile-nav-toggle,
  html.js-nav .mobile-nav-panel:not([hidden]) {
    display: flex;
  }

  html.js-nav .mobile-nav-panel:not([hidden]) {
    flex-direction: column;
  }

  html.js-nav .nav-shell {
    padding-right: 58px;
  }

  .nav-cta {
    display: none;
  }
}

@media (max-width: 640px) {
  .mobile-nav-toggle,
  .mobile-nav-panel {
    right: 16px;
  }

  .mobile-nav-panel {
    width: calc(100vw - 32px);
    max-height: calc(100vh - 92px);
  }

  html.js-nav .nav-shell {
    padding-right: 50px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mobile-nav-icon span,
  .mobile-nav-links a {
    transition: none;
  }
}