.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding: 1.25rem 0;
  transition: background var(--trans-normal), padding var(--trans-normal), box-shadow var(--trans-normal);
}
.site-header.is-scrolled {
  background: rgba(17,17,17,0.97);
  backdrop-filter: blur(12px);
  padding: 0.875rem 0;
  box-shadow: 0 2px 24px rgba(0,0,0,0.3);
}
.site-header--light.is-scrolled {
  background: rgba(255,255,255,0.97);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-8);
}

/* Logo */
.site-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
}
.site-logo__mark {
  width: 40px;
  height: 40px;
  background: var(--clr-orange);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--clr-white);
  letter-spacing: -0.5px;
}
.site-logo__text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--clr-white);
  line-height: 1.2;
}
.site-logo__text span {
  display: block;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--clr-orange);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.site-header--light .site-logo__text { color: var(--clr-dark); }

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}
.nav-item {
  position: relative;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: rgba(255,255,255,0.8);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-sm);
  transition: color var(--trans-fast);
}
.nav-link:hover, .nav-link.is-active {
  color: var(--clr-white);
}
.nav-link svg {
  width: 14px;
  height: 14px;
  transition: transform var(--trans-fast);
}
.nav-item:hover .nav-link svg { transform: rotate(180deg); }
.site-header--light .nav-link { color: rgba(0,0,0,0.7); }
.site-header--light .nav-link:hover { color: var(--clr-dark); }

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--clr-white);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-2);
  min-width: 220px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--trans-normal), transform var(--trans-normal);
  transform: translateX(-50%) translateY(8px);
}
.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown a {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-text);
  transition: background var(--trans-fast), color var(--trans-fast);
}
.nav-dropdown a:hover {
  background: var(--clr-light);
  color: var(--clr-orange);
}
.nav-dropdown__icon {
  width: 32px;
  height: 32px;
  background: rgba(255,139,0,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

/* Header CTA */
.header-cta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
}

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--sp-2);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--clr-white);
  border-radius: 2px;
  transition: all var(--trans-normal);
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--clr-dark);
  z-index: calc(var(--z-nav) - 1);
  padding: 6rem var(--sp-6) var(--sp-6);
  flex-direction: column;
  overflow-y: auto;
}
.mobile-menu.is-open { display: flex; }
.mobile-menu__nav { display: flex; flex-direction: column; gap: var(--sp-1); }
.mobile-menu__link {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--clr-white);
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--clr-border-dark);
  transition: color var(--trans-fast);
}
.mobile-menu__link:hover { color: var(--clr-orange); }
.mobile-menu__sub { padding-left: var(--sp-4); margin-top: var(--sp-2); display: flex; flex-direction: column; gap: var(--sp-2); }
.mobile-menu__sub a { font-size: var(--fs-base); color: rgba(255,255,255,0.6); font-weight: 500; }
.mobile-menu__sub a:hover { color: var(--clr-orange); }
.mobile-menu__cta { margin-top: var(--sp-8); }
.mobile-menu__cta .btn { width: 100%; justify-content: center; }