.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem var(--px);
  background: rgba(8, 8, 16, 0.75);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s var(--ease);
}
[data-theme="light"] .nav {
  background: rgba(242, 242, 250, 0.85);
}
.nav.scrolled {
  background: rgba(8, 8, 16, 0.95);
}
[data-theme="light"] .nav.scrolled {
  background: rgba(242, 242, 250, 0.97);
}

.nav-logo {
  font-family: var(--font-m);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent);
}
.nav-logo .dim {
  color: var(--muted);
}

.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  font-family: var(--font-m);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  position: relative;
  transition: color 0.2s var(--ease);
}
.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.25s var(--ease);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.7rem;
  font-family: var(--font-m);
  font-size: 0.68rem;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50px;
  cursor: pointer;
  transition:
    border-color 0.2s var(--ease),
    color 0.2s var(--ease);
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--muted);
  transition: all 0.25s var(--ease);
}
.hamburger.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
  background: var(--accent);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
  background: var(--accent);
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: 57px;
  left: 0;
  right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem var(--px);
  flex-direction: column;
  gap: 1.25rem;
  z-index: 999;
}
.mobile-drawer.open {
  display: flex;
}
.mobile-drawer a {
  font-family: var(--font-m);
  font-size: 0.85rem;
  color: var(--muted);
}
.mobile-drawer a:hover {
  color: var(--accent);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hamburger {
    display: flex;
  }
}