.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  transition:
    background var(--t),
    border-color var(--t);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(2, 11, 24, 0.92);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom-color: var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text-0);
  transition: opacity var(--t);
  letter-spacing: -0.01em;
}

.nav-logo:hover {
  opacity: 0.75;
}

.nav-logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1.5px solid var(--border-hover);
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: 0 0 12px rgba(59, 158, 255, 0.3);
}

.nav-logo-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  position: relative;
  padding-bottom: 4px;
  transition: color var(--t);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-teal));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t) var(--ease-spring);
  border-radius: 99px;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text-0);
}

.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 10px;
  border-radius: var(--r-sm);
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-0);
  transition:
    transform var(--t),
    opacity var(--t);
  transform-origin: center;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  background: rgba(2, 11, 24, 0.97);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
  padding: 8px 0;
  z-index: calc(var(--z-nav) - 1);
  flex-direction: column;
}

.nav-mobile.open {
  display: flex;
  animation: navMobileIn 0.22s var(--ease) forwards;
}

@keyframes navMobileIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.nav-mobile a {
  padding: 14px var(--container-pad);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-1);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  transition: color var(--t), background var(--t);
  min-height: 52px;
  display: flex;
  align-items: center;
}

.nav-mobile a:last-child {
  border-bottom: none;
}

.nav-mobile a:hover,
.nav-mobile a[aria-current="page"] {
  color: var(--accent-blue);
  background: rgba(59, 158, 255, 0.05);
}

@media (max-width: 780px) {
  .nav-links {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
}