/* Skip to content — visually hidden until focused */
.skip-to-content {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--accent-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-size: 0.875rem;
  text-decoration: none;
}
.skip-to-content:focus {
  top: 1rem;
}

/* Header / Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-md) 0;
  transition: all var(--transition);
}

.nav--scrolled {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.nav__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav__logo-img {
  position: absolute;
  height: 90px;
  width: auto;
  display: block;
}

.nav__links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav__link {
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
  padding-bottom: 4px;
}

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

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

.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--accent-primary);
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition);
}

.nav__hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

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

.nav__hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(8px, -8px);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav__hamburger {
    display: flex;
  }

  .nav__links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }

  .nav__links.open {
    max-height: 500px;
  }

  .nav__link {
    padding: var(--spacing-sm) var(--spacing-md);
    border-left: 3px solid transparent;
    transition: all var(--transition);
  }

  .nav__link--active {
    border-left-color: var(--accent);
    background-color: var(--accent-glow);
  }

  .nav__link--active::after {
    display: none;
  }

  .nav__logo-img {
    height: 32px;
  }
}

/* Page Wrapper - Account for fixed header */
.page-wrapper {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

/* Page Header */
.page-header {
  background-color: var(--bg-secondary);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.page-header h1 {
  margin-bottom: var(--spacing-sm);
}

.page-header p {
  color: var(--text-muted);
  font-size: 1.125rem;
}

/* Footer */
.footer {
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-xl);
}

.footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.footer__content {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  align-items: start;
}

.footer__section {
  font-size: 0.9375rem;
}

.footer__section-title {
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  list-style: none;
}

.footer__link {
  color: var(--text-secondary);
  transition: color var(--transition);
}

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

.footer__copy {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer__address {
  color: var(--text-secondary);
  margin-top: var(--spacing-sm);
}

.footer__downloads {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.footer__downloads strong {
  font-family: var(--font-mono);
  color: var(--accent-soft);
  font-variant-numeric: tabular-nums;
}

.footer__downloads-link {
  color: var(--accent-soft);
  text-decoration: none;
  font-size: 0.85rem;
  opacity: 0.8;
  transition: opacity var(--transition);
}

.footer__downloads-link:hover {
  opacity: 1;
}

/* Footer Mobile */
@media (max-width: 768px) {
  .footer__content {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .footer__section {
    text-align: center;
  }

  .footer__links {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
  }
}