/* Layout Containers */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
  width: 100%;
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-5);
  width: 100%;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  z-index: 100;
  background-color: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base);
}

.site-header.is-hidden {
  transform: translateY(-100%);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.header-logo a {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.header-logo img {
  height: 28px;
}

.header-logo span {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-left: var(--space-2);
  letter-spacing: -0.02em;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Center nav links absolutely so they sit in the geometric middle
   of the header regardless of logo/actions width asymmetry */
.nav-links {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links li {
  margin-bottom: 0;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  text-decoration: none;
  font-size: 0.875rem;
  letter-spacing: 0.01em;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--text-primary);
  background-color: color-mix(in srgb, var(--bg-surface) 80%, transparent);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.theme-toggle,
.header-social {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: var(--space-2);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover,
.header-social:hover {
  background-color: var(--bg-surface);
  color: var(--accent);
}

.theme-toggle svg,
.header-social svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: var(--space-2);
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

/* Main Content Area */
main {
  min-height: calc(100svh - 64px - 300px); /* fallback min-height */
}

/* Footer */
.site-footer {
  background-color: var(--bg-surface);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: var(--space-24);
  border-top: 1px solid var(--border);
  position: relative;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-8);
}

.footer-brand h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin-bottom: var(--space-2);
}

.footer-brand p {
  color: var(--text-muted);
  max-width: 300px;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-nav h4 {
  font-size: 1.1rem;
  margin-bottom: var(--space-2);
}

.footer-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav a {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.footer-nav a:hover {
  color: var(--accent);
  text-decoration: none;
}

.footer-social {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  color: var(--text-secondary);
  background: color-mix(in srgb, var(--bg-surface) 30%, transparent);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  border: 1px solid color-mix(in srgb, var(--border) 30%, transparent);
  transition: all 300ms cubic-bezier(0.16, 1, 0.3, 1);
  font-size: 0.9rem;
  font-weight: 500;
}

.social-link:hover {
  color: var(--text-primary);
  background: color-mix(in srgb, var(--accent) 50%, transparent);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--accent) 20%, transparent);
}

.social-link svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.footer-bottom {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-4);
}

.footer-bottom-links a {
  color: var(--text-muted);
}

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

/* Mobile Layout Adjustments */
@media (max-width: 768px) {
  .nav-links {
    display: none; /* Hide default nav, show in mobile menu */
  }

  .mobile-menu-btn {
    display: block;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    align-items: flex-start;
  }
}

/* Mobile Menu Overlay */
.mobile-menu {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg);
  z-index: 99;
  padding: var(--space-6) var(--space-5);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  border-top: 1px solid var(--border);
}

.mobile-menu.is-active {
  transform: translateX(0);
}

.mobile-menu .nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.mobile-menu .nav-links a {
  font-size: 1.5rem;
  font-family: var(--font-heading);
}