/* ─── STICKY HEADER ────────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: oklch(0.18 0.04 260 / 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid oklch(0.72 0.07 270 / 0.12);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-md);
}
@media (max-width: 640px) {
  .nav-inner { padding: 0 var(--space-sm); }
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo img {
  height: 40px;
  width: auto;
}
.nav-logo-text {
  font-family: var(--font-primary);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-paper);
  letter-spacing: -0.01em;
  line-height: 1.2;
  white-space: nowrap;
}
.nav-logo-text span {
  display: block;
  font-weight: 300;
  font-size: 0.75rem;
  color: var(--c-lavender);
  letter-spacing: 0.02em;
}

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

.nav-links a {
  font-family: var(--font-primary);
  font-size: 0.875rem;
  font-weight: 400;
  color: oklch(0.72 0.07 270);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--r-sm);
  transition: color 180ms var(--ease-std), background 180ms var(--ease-std);
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--c-paper);
  background: oklch(0.72 0.07 270 / 0.12);
}

.nav-links .nav-cta a {
  color: var(--c-gold);
  border: 1px solid oklch(0.78 0.12 72 / 0.35);
  padding: 6px 14px;
}
.nav-links .nav-cta a:hover {
  background: oklch(0.78 0.12 72 / 0.12);
  color: var(--c-gold);
}

/* ─── MOBILE HAMBURGER (CSS-only) ─────────────────────────────────────────── */

.nav-toggle {
  display: none;
}
.nav-toggle-label {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle-label span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-lavender);
  border-radius: 2px;
  transition: transform 200ms var(--ease-std), opacity 200ms var(--ease-std);
}

@media (max-width: 768px) {
  .nav-toggle-label { display: flex; }

  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: oklch(0.18 0.04 260 / 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-sm) 0 var(--space-md);
    border-bottom: 1px solid oklch(0.72 0.07 270 / 0.15);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 250ms var(--ease-out), opacity 250ms var(--ease-out);
  }
  .nav-links a {
    padding: 14px var(--space-md);
    border-radius: 0;
    font-size: 1rem;
  }
  .nav-links .nav-cta { margin-top: var(--space-xs); }
  .nav-links .nav-cta a {
    margin: 0 var(--space-md);
    border-radius: var(--r-md);
    text-align: center;
  }

  .nav-toggle:checked ~ .site-header .nav-links,
  .nav-toggle:checked + .site-header .nav-links {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
}

/* JS-controlled mobile menu (open class approach, fallback) */
.nav-links.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.hamburger-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger-open span:nth-child(2) { opacity: 0; }
.hamburger-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }