.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  transition: background var(--transition-base);
}

.nav__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav__links {
  display: flex;
  gap: var(--space-lg);
}

.nav__link {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-secondary);
  position: relative;
  padding: 0.3rem 0;
  transition: color var(--transition-fast);
}

.nav__link::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gradient-1), var(--gradient-2));
  transition: width var(--transition-base), left var(--transition-base);
  border-radius: 1px;
}

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

.nav__link:hover::before {
  width: 100%;
  left: 0;
}

/* Active page */
.nav__link--active {
  color: var(--text-primary);
  text-shadow: 0 0 8px rgba(20, 157, 221, 0.4);
}

.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--gradient-1), var(--gradient-2));
  border-radius: 1px;
}

/* Hamburger menu button */
.nav__toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-width: 44px;
  min-height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1001;
}

.nav__toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Hamburger to X animation */
.nav__toggle--active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle--active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle--active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu backdrop scrim — covers the page behind the drawer,
   click anywhere on it to close. Only visible while the menu is open. */
.nav__scrim {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
  z-index: 998;
}

body.menu-open .nav__scrim {
  opacity: 1;
  pointer-events: auto;
}