/* ==================== LAYOUT - HEADER, FOOTER, NAVIGATION ==================== */

/* ========== HEADER ========== */
.site-header {
  padding: var(--space-md) var(--space-sm);
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border-light);
}

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

.header-brand {
  flex: 1;
}

.header-logo {
  display: block;
  font-size: var(--font-header-logo);
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--color-primary-text);
  text-decoration: none;
  margin-bottom: 0.25rem;
  transition: opacity 0.2s ease;
}

.header-logo:hover,
.header-logo:focus {
  opacity: 0.7;
}

.header-tagline {
  font-size: var(--font-header-tagline);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.7;
  margin: var(--space-xs) 0;
  color: var(--color-primary-text);
}

.header-description {
  font-size: var(--font-header-description);
  font-weight: 300;
  line-height: 1.6;
  color: var(--color-medium-gray);
  margin: var(--space-xs) 0 0;
  max-width: 600px;
}

/* ========== DESKTOP NAVIGATION ========== */
.desktop-nav {
  display: none;
  gap: var(--space-md);
}

.nav-link {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-primary-text);
  text-decoration: none;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, opacity 0.2s ease;
}

.nav-link:hover,
.nav-link:focus {
  opacity: 0.7;
  border-bottom-color: var(--color-primary-text);
}

/* ========== MOBILE BOTTOM NAVIGATION ========== */
.mobile-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-background);
  border-top: 1px solid var(--color-border-light);
  display: flex;
  justify-content: space-around;
  padding: 0.75rem 0 calc(0.75rem + env(safe-area-inset-bottom));
  z-index: 1000;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.mobile-nav-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  color: var(--color-primary-text);
  text-decoration: none;
  padding: var(--space-xs) var(--space-sm);
  min-width: 80px;
  transition: opacity 0.2s ease;
}

.mobile-nav-link:hover,
.mobile-nav-link:focus {
  opacity: 0.6;
}

.mobile-nav-link span {
  font-size: 0.75rem;
  font-weight: 500;
}

.mobile-nav-link svg {
  flex-shrink: 0;
}

/* ========== FOOTER ========== */
.site-footer {
  background: var(--color-background);
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-md) var(--space-sm);
  margin-top: var(--space-lg);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  text-align: center;
}

.footer-copyright {
  font-size: var(--font-footer-copyright);
  line-height: 1.2;
  color: var(--color-light-gray);
  margin: 0;
}

.footer-divider {
  color: var(--color-light-gray);
  font-size: 0.8rem;
}

.footer-legal {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-footer-legal);
  color: var(--color-light-gray);
}

.footer-link {
  color: var(--color-light-gray);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-link:hover,
.footer-link:focus {
  color: var(--color-primary-text);
  text-decoration: underline;
}

.footer-legal span {
  color: var(--color-light-gray);
}

/* ========== RESPONSIVE BREAKPOINTS ========== */

/* Desktop: Show desktop nav, hide mobile nav */
@media (min-width: 768px) {
  .desktop-nav {
    display: flex;
  }

  .mobile-nav {
    display: none;
  }
}

/* Mobile: Stack footer vertically */
@media (max-width: 767px) {
  .footer-content {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .footer-divider {
    display: none;
  }
}