/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  transition: box-shadow var(--transition-base);
}

.site-header.header--scrolled {
  box-shadow: var(--shadow-md);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav__logo {
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--color-primary);
}

.nav__logo span {
  color: var(--color-secondary);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-gray-700);
  transition: color var(--transition-fast);
}

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

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-gray-800);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* Sections */
.section {
  padding: var(--space-4xl) 0;
}

.section--alt {
  background-color: var(--color-gray-50);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

/* Grids */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

/* Footer */
.site-footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand {
  max-width: 300px;
}

.footer__brand .nav__logo {
  margin-bottom: var(--space-md);
}

.footer__brand p {
  font-size: var(--fs-sm);
  color: var(--color-gray-500);
}

.footer__links h4 {
  color: var(--color-white);
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.footer__links a {
  display: block;
  font-size: var(--fs-sm);
  color: var(--color-gray-500);
  margin-bottom: var(--space-sm);
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  border-top: 1px solid var(--color-gray-800);
  padding-top: var(--space-lg);
  text-align: center;
  font-size: var(--fs-sm);
}

/* Responsive */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding: var(--space-3xl) 0;
  }

  .nav__links {
    height: fit-content;
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: center;
    background: var(--color-white, #ffffff);
    padding: var(--space-3xl) var(--space-2xl);
    gap: var(--space-lg);
    z-index: 1001;
    overflow-y: auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  }

  .nav--open .nav__links {
    display: flex;
  }

  .nav__hamburger {
    display: flex;
  }

  .nav__actions .btn {
    padding: 0.5rem 1rem;
    font-size: var(--fs-xs);
  }

  .nav--open .nav__hamburger span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav--open .nav__hamburger span:nth-child(2) {
    opacity: 0;
  }

  .nav--open .nav__hamburger span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .footer__content {
    flex-direction: column;
  }
}