/* Navigation System */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  padding: 0 var(--space-8);
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out);
}

.site-nav.scrolled {
  background: rgba(255,255,255,0.96);
  box-shadow: 0 1px 24px rgba(0,0,0,0.08);
}

.site-nav.dark-nav {
  background: rgba(10,22,40,0.92);
  border-bottom-color: rgba(255,255,255,0.08);
}
.site-nav.dark-nav.scrolled {
  background: rgba(10,22,40,0.98);
  box-shadow: 0 1px 24px rgba(0,0,0,0.3);
}

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

.nav-logo {
  height: 36px;
  width: auto;
  display: block;
}

.nav-wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.dark-nav .nav-wordmark { color: var(--white); }

/* Center links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0 auto;
  padding: 0;
}

.nav-links li { position: relative; }

.nav-links a {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: var(--gray-100);
}

.dark-nav .nav-links a { color: rgba(255,255,255,0.72); }
.dark-nav .nav-links a:hover,
.dark-nav .nav-links a.active {
  color: var(--white);
  background: rgba(255,255,255,0.10);
}

.nav-links a .chevron {
  width: 14px;
  height: 14px;
  opacity: 0.5;
  transition: transform var(--duration-fast) var(--ease-out);
}
.nav-links li:hover .chevron { transform: rotate(180deg); opacity: 1; }

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 220px;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-subtle);
  padding: var(--space-2);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
  z-index: 100;
}

.nav-links li:hover .nav-dropdown,
.nav-links li:focus-within .nav-dropdown {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown a {
  display: flex;
  flex-direction: column;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-weight: 500;
  background: transparent;
}

.nav-dropdown a:hover { background: var(--gray-50); color: var(--h2eo-teal); }
.nav-dropdown a span { font-size: var(--text-xs); color: var(--text-muted); font-weight: 400; margin-top: 2px; }

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

.nav-login {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  transition: color var(--duration-fast);
}
.nav-login:hover { color: var(--text-primary); }
.dark-nav .nav-login { color: rgba(255,255,255,0.72); }
.dark-nav .nav-login:hover { color: var(--white); }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  background: var(--h2eo-teal);
  color: var(--white) !important;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transition: background var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}
.nav-cta:hover {
  background: var(--h2eo-mid-blue);
  transform: translateY(-1px);
  box-shadow: var(--shadow-teal);
}

/* Mobile hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--duration-base) var(--ease-out),
              opacity var(--duration-fast);
}
.dark-nav .nav-hamburger span { background: var(--white); }
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  position: fixed;
  inset: var(--nav-height) 0 0 0;
  background: var(--white);
  z-index: 999;
  padding: var(--space-8);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--duration-base) var(--ease-out);
}
.mobile-menu.open { transform: translateX(0); }

.mobile-menu ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.mobile-menu a {
  display: block;
  padding: var(--space-4);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--text-primary);
  border-radius: var(--radius-md);
  text-decoration: none;
}
.mobile-menu a:hover { background: var(--gray-50); color: var(--h2eo-teal); }

.mobile-menu-footer {
  margin-top: var(--space-8);
  padding-top: var(--space-8);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* Spacer for fixed nav */
.nav-spacer { height: var(--nav-height); }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-login { display: none; }
  .nav-cta { display: none !important; }
  .nav-actions { margin-left: auto; }
  .nav-hamburger { display: flex; }
}

@media (max-width: 600px) {
  .site-nav { padding: 0 var(--space-5); }
}