/* ============================================
   NEXCORE — Navigation Styles
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition:
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive);
  overflow: visible;
}

[data-theme='dark'] .site-header {
  background: rgba(11, 21, 16, 0.95);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  gap: var(--space-8);
  overflow: visible;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo-img {
  height: 110px;
  width: 110px;
  object-fit: contain;
  border-radius: 50%;
  position: relative;
  top: 30px;
  z-index: 200;
  drop-shadow: 0 4px 12px rgba(0,0,0,0.15);
  flex-shrink: 0;
}

.nav-logo-text {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-navy);
  letter-spacing: -0.01em;
  line-height: 1;
}

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

/* Desktop nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-md);
  white-space: nowrap;
  font-family: var(--font-body);
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.nav-link.is-active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-link svg {
  transition: transform var(--transition-interactive);
}

.nav-dropdown-trigger:hover svg,
.nav-dropdown-trigger:focus svg {
  transform: rotate(180deg);
}

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  min-width: 220px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  list-style: none;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition:
    opacity var(--transition-interactive),
    transform var(--transition-interactive);
  z-index: 200;
}

.nav-dropdown.is-visible {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}

.nav-dropdown a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  transition: background var(--transition-interactive), color var(--transition-interactive);
}

.nav-dropdown a:hover {
  background: var(--color-surface-offset);
  color: var(--color-primary);
}

.nav-dropdown .dropdown-section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-4) var(--space-1);
  font-family: var(--font-body);
}

.nav-dropdown .dropdown-divider {
  height: 1px;
  background: var(--color-divider);
  margin: var(--space-2) var(--space-4);
}

/* Nav right side */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
}

/* Mobile menu button */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.mobile-menu-btn:hover {
  background: var(--color-surface-offset);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  padding: var(--space-4) 0 var(--space-6);
  border-top: 1px solid var(--color-divider);
  background: var(--color-bg);
}

.mobile-menu.is-open {
  display: flex;
}

.mobile-menu a {
  display: block;
  padding: var(--space-3) clamp(var(--space-4), 4vw, var(--space-16));
  font-size: var(--text-base);
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-body);
  font-weight: 500;
}

.mobile-menu a:hover {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.mobile-menu-section {
  padding: var(--space-2) clamp(var(--space-4), 4vw, var(--space-16)) var(--space-1);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-family: var(--font-body);
}

.mobile-menu-sub {
  padding-left: calc(clamp(var(--space-4), 4vw, var(--space-16)) + var(--space-4));
  font-size: var(--text-sm) !important;
  color: var(--color-text-muted) !important;
}

.mobile-menu-cta {
  margin: var(--space-4) clamp(var(--space-4), 4vw, var(--space-16)) 0;
}

.mobile-menu-cta .btn {
  width: 100%;
  justify-content: center;
}

/* Responsive breakpoints */
@media (max-width: 1024px) {
  .nav-links { display: none; }
  .nav-actions .btn { display: none; }
  .mobile-menu-btn { display: flex; }
}

@media (min-width: 1025px) {
  .mobile-menu { display: none !important; }
}