/* ============================================
   NAVIGATION — The Empathy Effect Inc
   ============================================ */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklch, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow var(--transition-interactive),
              background var(--transition-interactive);
}

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

.nav-inner {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  height: 72px;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo-image {
  width: 48px;
  height: 48px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}

.nav-logo-text {
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 0.8rem + 0.5vw, 1.15rem);
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.nav-logo-superscript {
  font-family: var(--font-body);
  font-size: 0.6em;
  font-weight: 500;
  letter-spacing: 0.08em;
  vertical-align: super;
  color: var(--color-accent);
  margin-left: 2px;
}

/* Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin-left: auto;
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.nav-link--active {
  color: var(--color-primary);
  font-weight: 600;
}

/* Right side actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: transform var(--transition-interactive), opacity var(--transition-interactive);
}

.nav-hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  padding: var(--space-6) var(--space-6) var(--space-8);
  border-top: 1px solid var(--color-divider);
  background: var(--color-bg);
}

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

.mobile-menu ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-link {
  display: block;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.mobile-link:hover {
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

/* CTA in nav */
.nav-cta {
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
}

/* Footer nav */
.site-footer .nav-logo-text {
  color: var(--color-text);
  white-space: nowrap;
  min-width: 0;
}

/* Responsive */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-cta { display: none; }
}

@media (max-width: 480px) {
  .nav-logo-text { display: none; }
}