/* Layout — nav, footer, grid */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  background: var(--bg-glass-strong);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

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

.nav-top-bar {
  border-bottom: 1px solid var(--border-color);
}

.nav-top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 52px;
  gap: var(--space-md);
}

.nav-menu-bar {
  padding: var(--space-sm) 0 var(--space-md);
}

.nav-menu-bar nav {
  width: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--text-primary);
  white-space: nowrap;
  flex-shrink: 0;
}

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

.nav-logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.08), 0 4px 16px rgba(79, 70, 229, 0.45);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-logo:hover .nav-logo-icon {
  transform: scale(1.05);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.15), 0 6px 22px rgba(6, 182, 212, 0.4);
}

.nav-logo-icon .jourai-logo-svg {
  width: 100%;
  height: 100%;
  display: block;
}

.nav-logo-icon .logo-goal-glow {
  animation: logo-goal-pulse 2.4s ease-in-out infinite;
}

@keyframes logo-goal-pulse {
  0%, 100% { opacity: 1; transform-origin: 31px 8px; transform: scale(1); }
  50% { opacity: 0.75; transform: scale(1.12); }
}

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

.nav-links-full {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.35rem 0.25rem;
  width: 100%;
}

.nav-links a {
  display: block;
  padding: 0.45rem 0.7rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-primary);
  background: var(--math-bg);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.icon-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: var(--math-bg);
}

.nav-toggle { display: none; }

.mobile-menu {
  display: none;
  position: fixed;
  top: 52px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-glass-strong);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: calc(var(--z-nav) + 10);
  padding: var(--space-lg);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

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

.mobile-menu ul {
  list-style: none;
  padding: 0;
}

.mobile-menu a {
  display: block;
  padding: var(--space-md);
  font-size: 1rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
}

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: var(--space-3xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand p {
  font-size: 0.875rem;
  margin-top: var(--space-md);
  max-width: 360px;
}

.footer-col h4 {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: var(--space-sm); }
.footer-col a { font-size: 0.875rem; color: var(--text-secondary); }
.footer-col a:hover { color: var(--accent-primary); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-color);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.social-links { display: flex; gap: var(--space-md); }
.social-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
}

.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition-base);
  z-index: 900;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }

.content-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: var(--space-2xl);
  align-items: start;
}

.page-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-lg));
  max-height: calc(100vh - var(--nav-height) - 2rem);
  overflow-y: auto;
}

.sidebar-nav {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  backdrop-filter: blur(12px);
}

.sidebar-nav h4 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: var(--space-sm) var(--space-sm);
  margin-bottom: var(--space-xs);
}

.sidebar-nav a {
  display: block;
  padding: 0.45rem var(--space-sm);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  color: var(--accent-primary);
  background: var(--math-bg);
  border-left-color: var(--accent-primary);
}

@media (max-width: 1024px) {
  :root { --nav-height: 52px; }
  .nav-menu-bar { display: none; }
  .nav-toggle { display: flex; }
  .content-layout { grid-template-columns: 1fr; }
  .page-sidebar { position: static; max-height: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1025px) {
  .nav-links a:hover,
  .nav-links a.active {
    border-color: var(--border-color);
  }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}