.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-5) 0;
  transition: background-color var(--transition-base), padding var(--transition-base), border-color var(--transition-base);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background-color: rgba(18, 19, 26, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: var(--space-4) 0;
  border-bottom-color: var(--color-border-subtle);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.site-header__logo {
  display: flex;
  align-items: center;
  z-index: 1001;
}

.site-header__logo img {
  height: 40px;
  width: auto;
}

/* Desktop Nav */
.site-header__nav {
  display: none;
}

.site-header__nav ul {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.site-header__nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  position: relative;
  padding: var(--space-2) 0;
  transition: color var(--transition-base);
}

.site-header__nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent-gold);
  transition: width var(--transition-base);
}

.site-header__nav a:hover,
.site-header__nav a.is-active {
  color: var(--color-accent-gold);
}

.site-header__nav a:hover::after,
.site-header__nav a.is-active::after {
  width: 100%;
}

/* Partner Login link - special styling */
.site-header__nav a.nav-login {
  color: var(--color-accent-gold);
  border: 1px solid var(--color-accent-gold);
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-xs);
  transition: background var(--transition-base), color var(--transition-base);
}

.site-header__nav a.nav-login::after {
  display: none;
}

.site-header__nav a.nav-login:hover {
  background: var(--color-accent-gold);
  color: var(--color-bg-primary);
}

/* Mobile Toggle */
.site-header__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 32px;
  height: 32px;
  z-index: 1001;
  cursor: pointer;
}

.site-header__toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-accent-gold);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.site-header__toggle.is-active span:first-child {
  transform: rotate(45deg) translate(3px, 3px);
}

.site-header__toggle.is-active span:last-child {
  transform: rotate(-45deg) translate(3px, -3px);
}

/* Mobile Menu Overlay */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(18, 19, 26, 0.98);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu ul {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
}

.mobile-menu a {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-text-primary);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-base), transform var(--transition-base), color var(--transition-base);
}

.mobile-menu.is-open a {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger mobile nav items */
.mobile-menu li:nth-child(1) a { transition-delay: 100ms; }
.mobile-menu li:nth-child(2) a { transition-delay: 150ms; }
.mobile-menu li:nth-child(3) a { transition-delay: 200ms; }
.mobile-menu li:nth-child(4) a { transition-delay: 250ms; }
.mobile-menu li:nth-child(5) a { transition-delay: 300ms; }
.mobile-menu li:nth-child(6) a { transition-delay: 350ms; }
.mobile-menu li:nth-child(7) a { transition-delay: 400ms; }
.mobile-menu li:nth-child(8) a { transition-delay: 450ms; }

.mobile-menu a:hover {
  color: var(--color-accent-gold);
}

.mobile-menu__social {
  margin-top: var(--space-12);
  opacity: 0;
  transition: opacity var(--transition-base);
  transition-delay: 500ms;
}

.mobile-menu.is-open .mobile-menu__social {
  opacity: 1;
}

/* Desktop breakpoint */
@media (min-width: 1024px) {
  .site-header__nav {
    display: block;
  }

  .site-header__toggle {
    display: none;
  }

  .mobile-menu {
    display: none;
  }
}