/* =====================================================
   P77 App — Header & Navigation
   ===================================================== */
.site-nav {
  position: sticky; top: 0; z-index: 1000;
  height: var(--nav-height);
  background: rgba(17,17,24,0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--transition-normal), border-color var(--transition-normal), background var(--transition-normal);
}
.site-nav.scrolled {
  background: rgba(17,17,24,0.96);
  border-bottom-color: var(--clr-border);
  box-shadow: 0 6px 24px rgba(0,0,0,0.45);
}
.nav-inner {
  max-width: var(--max-width); margin-inline: auto; height: 100%;
  display: flex; align-items: center; gap: var(--sp-lg);
  padding-inline: var(--sp-lg);
}

/* ── Brand wordmark ── */
.nav-logo { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  height: 40px; width: auto; flex-shrink: 0;
  filter: drop-shadow(0 0 10px var(--clr-accent-glow));
  transition: transform var(--transition-fast);
}
.brand-mark img { height: 100%; width: auto; display: block; }
.nav-logo:hover .brand-mark { transform: scale(1.05); }
.brand-text {
  font-family: var(--font-display); font-weight: var(--fw-bold);
  font-size: 1.35rem; color: var(--clr-text-primary); letter-spacing: 0.02em;
}
.brand-text span { color: var(--clr-accent-gold); }

/* ── Desktop links ── */
.nav-links { display: none; align-items: center; gap: var(--sp-md); margin-inline: auto; white-space: nowrap; }
.nav-link {
  position: relative; font-weight: var(--fw-medium); font-size: var(--fs-sm);
  color: var(--clr-text-secondary); padding: 6px 2px; transition: color var(--transition-fast);
}
.nav-link:hover { color: var(--clr-text-primary); }
.nav-link::after {
  content: ""; position: absolute; left: 0; bottom: -4px; height: 2px; width: 0;
  background: var(--gradient-gold); border-radius: var(--radius-pill);
  transition: width var(--transition-normal);
}
.nav-link:hover::after { width: 100%; }
.nav-link.active { color: var(--clr-accent-gold); }
.nav-link.active::after { width: 100%; box-shadow: var(--shadow-glow); }

.nav-cta { display: none; margin-left: auto; }

/* ── Hamburger ── */
.nav-hamburger {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px; margin-left: auto; border-radius: var(--radius-sm);
}
.nav-hamburger span {
  display: block; width: 26px; height: 3px; margin-inline: auto; border-radius: 3px;
  background: var(--clr-text-primary); transition: transform var(--transition-normal), opacity var(--transition-fast);
}
.nav-hamburger.is-open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-hamburger.is-open span:nth-child(2) { opacity: 0; }
.nav-hamburger.is-open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ── Mobile overlay ── */
.nav-mobile-overlay {
  position: fixed; inset: var(--nav-height) 0 0 0; z-index: 999;
  background: rgba(13,13,18,0.98);
  backdrop-filter: blur(6px);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--sp-lg); padding: var(--sp-xl); overflow-y: auto;
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
}
.nav-mobile-overlay.is-open { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-mobile-overlay a:not(.btn) {
  font-family: var(--font-display); font-size: var(--fs-xl); font-weight: var(--fw-semibold);
  color: var(--clr-text-primary);
}
.nav-mobile-overlay a:not(.btn).active { color: var(--clr-accent-gold); }
.nav-mobile-overlay .btn { margin-top: var(--sp-md); }

/* ── Desktop breakpoint: links show, hamburger hides ── */
@media (min-width: 1120px) {
  .nav-links { display: flex; }
  .nav-cta { display: inline-flex; }
  .nav-hamburger { display: none; }
  .nav-mobile-overlay { display: none; }
}