/* ════════════════════════════════════════════════════════════
   navbar.css — Sticky Header
   ════════════════════════════════════════════════════════════ */

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  padding: var(--space-l) var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-alpha);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: padding 0.4s var(--ease-out), background 0.4s var(--ease-out);
}

nav.scrolled {
  padding: var(--space-s) var(--space-xl);
  background: var(--surface);
  box-shadow: 0 6px 24px oklch(0% 0 0% / 8%);
}

.nav-actions {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--navy);
  text-decoration: none;
  letter-spacing: -0.01em;
}

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

.nav-links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--border-deep);
  background: var(--surface);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.3s var(--ease-out), border-color 0.3s var(--ease-out), background 0.3s var(--ease-out);
}

.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

.theme-toggle-icon {
  font-size: 1rem;
  line-height: 1;
}

.nav-links a {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-soft);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.3s var(--ease-out);
}

.nav-links a:hover {
  color: var(--navy);
}

.nav-cta {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--surface);
  background: var(--accent-dark);
  padding: 8px 18px;
  border-radius: 100px;
  text-decoration: none;
  border: 1px solid oklch(from var(--accent-dark) l c h / 32%);
  box-shadow: 0 6px 16px oklch(from var(--accent-dark) l c h / 22%);
  transition: transform 0.3s var(--ease-out), background 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}

.nav-cta:hover {
  background: var(--accent);
  border-color: oklch(from var(--accent) l c h / 40%);
  transform: translateY(-1px);
}

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-cta { display: none; }
}