/* ============================================================
   Navigation Styles
   ============================================================ */

#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(224,227,239,0.6);
  transition: background var(--t-base), box-shadow var(--t-base);
}
#nav.scrolled {
  background: rgba(255,255,255,0.96);
  box-shadow: 0 1px 0 var(--border), 0 4px 20px rgba(15,17,23,0.06);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.nav-logo { transition: opacity var(--t-fast); }
.nav-logo:hover { opacity: 0.8; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}
.nav-links a {
  padding: 0.4rem 0.85rem;
  border-radius: var(--r-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-600);
  transition: color var(--t-fast), background var(--t-fast);
  position: relative;
}
.nav-links a:hover {
  color: var(--blue-700);
  background: var(--blue-50);
}
.nav-links a.active { color: var(--blue-700); }

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

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  border-radius: var(--r-sm);
  transition: background var(--t-fast);
}
.nav-hamburger:hover { background: var(--gray-100); }
.nav-hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all var(--t-base);
  transform-origin: center;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Menu */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-h); left: 0; right: 0;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: var(--space-4) var(--space-6) var(--space-6);
  box-shadow: var(--shadow-lg);
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--t-slow), opacity var(--t-base);
  z-index: 999;
}
.nav-mobile.open {
  transform: none;
  opacity: 1;
  pointer-events: all;
}
.nav-mobile a {
  display: block;
  padding: 0.7rem 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-100);
  transition: color var(--t-fast);
}
.nav-mobile a:last-of-type { border-bottom: none; }
.nav-mobile a:hover { color: var(--blue-700); }
.nav-mobile .btn { margin-top: var(--space-4); width: 100%; justify-content: center; }

/* Nav progress indicator */
.nav-progress {
  position: absolute;
  bottom: 0; left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--blue-700), var(--green-700));
  width: 0%;
  transition: width 0.1s linear;
}

@media (max-width: 768px) {
  .nav-hamburger { display: flex; }
  .nav-links { display: none; }
  .nav-actions .btn-outline { display: none; }
  .nav-mobile { display: block; }
}