/* Site-wide navigation */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 248, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-normal);
}

[data-theme="dark"] .site-header {
  background: rgba(10, 10, 10, 0.85);
}

.site-nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-3) var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-text);
}

.nav-link.coming-soon {
  opacity: 0.5;
  cursor: default;
  position: relative;
}

.nav-link.coming-soon::after {
  content: 'soon';
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: absolute;
  top: -8px;
  right: -16px;
  color: var(--color-accent);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
  cursor: pointer;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* Mobile */
@media (max-width: 640px) {
  .site-nav { padding: var(--space-3) var(--space-4); }
  .nav-links { gap: var(--space-4); }
  .nav-link { font-size: 0.8rem; }
  .nav-link.coming-soon::after { display: none; }
}