.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-darker-gray);
  transition: var(--transition);
}

.header.scrolled {
  background: rgba(0, 0, 0, 0.98);
  box-shadow: 0 4px 20px rgba(255, 255, 255, 0.05);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem var(--spacing-md);
}

.logo {
  font-size: 1.8rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  font-family: var(--font-display);
}

.logo span {
  font-weight: 300;
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.nav-links a {
  position: relative;
  padding: 0.5rem 0;
  font-weight: 500;
  transition: var(--transition);
  color: var(--color-light-gray);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-white);
  transition: width 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-white);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.mobile-toggle span {
  width: 25px;
  height: 2px;
  background: var(--color-white);
  transition: var(--transition);
}

.footer {
  background: var(--color-dark);
  border-top: 1px solid var(--color-darker-gray);
  padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.footer-section h3 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-sm);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-xs);
}

.footer-links a {
  color: var(--color-gray);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-darker-gray);
  color: var(--color-gray);
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }
  
  .nav-links {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(0, 0, 0, 0.98);
    padding: var(--spacing-md);
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }
  
  .nav-links.active {
    transform: translateX(0);
  }
}