.site-header {
  --sp: 0; /* 0 = top of page, 1 = scrolled — driven continuously by nav.js */
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: calc(16px - var(--sp) * 7px) var(--gutter);
  background: rgba(255,255,255, calc(.72 + var(--sp) * .22));
  backdrop-filter: blur(calc(6px + var(--sp) * 10px)) saturate(1.4);
  -webkit-backdrop-filter: blur(calc(6px + var(--sp) * 10px)) saturate(1.4);
  border-bottom: 1px solid rgba(240,226,255, calc(.3 + var(--sp) * .5));
  box-shadow: 0 calc(var(--sp) * 18px) calc(var(--sp) * 34px) rgba(120,60,190, calc(var(--sp) * .16));
  transition: background var(--dur-fast) linear;
}
.site-header::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 3px;
  background: var(--grad-rainbow); background-size: 200% 100%;
  opacity: var(--sp); transform: scaleX(calc(.7 + var(--sp) * .3)); transform-origin: center;
  transition: opacity var(--dur-fast) linear;
  animation: rainbow-drift 6s linear infinite;
}
@keyframes rainbow-drift { to { background-position: 200% 0; } }

.site-header__logo { display: flex; align-items: center; gap: 10px; flex: none; }
.site-header__logo-img { display: block; }
.site-header__logo-img img { height: calc(50px - var(--sp) * 12px); width: auto; display: block; }

.site-nav { display: flex; align-items: center; gap: 2px; font-size: 16px; font-weight: 700; }
.site-nav__item { position: relative; }
.site-nav__link {
  display: flex; align-items: center; gap: 5px; padding: 10px 15px; border-radius: var(--r-pill);
  color: var(--ink); background: none; border: none; cursor: pointer; font: inherit;
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.site-nav__link:hover, .site-nav__link[aria-expanded="true"] { background: #f7edff; color: var(--purple); }
.site-nav__link .caret { font-size: 11px; opacity: .55; transition: transform var(--dur-fast) var(--ease-out); }
.site-nav__link[aria-expanded="true"] .caret { transform: rotate(180deg); }

.site-nav__panel {
  position: absolute; top: calc(100% + 8px); left: 0; min-width: 270px; padding: 10px;
  background: #fff; border: 2px solid var(--line); border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: opacity var(--dur-mid) var(--ease-out), transform var(--dur-mid) var(--ease-out), visibility var(--dur-mid);
}
.site-nav__item.is-open .site-nav__panel { opacity: 1; visibility: visible; transform: translateY(0); }
.site-nav__panel--wide { left: 50%; transform: translateX(-50%) translateY(-8px); min-width: 620px; display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 2px 8px; }
.site-nav__item.is-open .site-nav__panel--wide { transform: translateX(-50%) translateY(0); }
.site-nav__panel-label { grid-column: 1/-1; padding: 0 12px 8px; font-size: 11px; font-weight: 800; letter-spacing: 1.4px; color: var(--ink-faint); }

.site-nav__panel a { display: block; padding: 10px 14px; border-radius: 12px; font-size: 15px; color: var(--ink); }
.site-nav__panel a:hover { background: #fff0f8; color: var(--pink); }
.site-nav__panel a.price-row { display: flex; justify-content: space-between; gap: 10px; }

.site-header__actions { display: flex; align-items: center; gap: 10px; flex: none; }
.nav-toggle { display: none; }

@media (max-width: 1080px) {
  .site-nav { display: none; }
  .nav-toggle {
    display: flex; align-items: center; justify-content: center; width: 46px; height: 46px;
    border-radius: var(--r-md); border: 2px solid var(--line); background: #fff; cursor: pointer;
  }
  .site-header__actions .btn-primary.desktop-only { display: none; }
}

/* Mobile drawer */
.mobile-nav {
  position: fixed; inset: 0; z-index: 150; display: none;
}
.mobile-nav.is-open { display: block; }
.mobile-nav__backdrop { position: absolute; inset: 0; background: rgba(46,35,80,.45); }
.mobile-nav__panel {
  position: absolute; top: 0; right: 0; bottom: 0; width: min(340px, 86vw);
  background: #fff; padding: 20px; overflow-y: auto;
  box-shadow: -12px 0 40px rgba(0,0,0,.18);
  animation: mobile-slide-in var(--dur-mid) var(--ease-out);
}
@keyframes mobile-slide-in { from { transform: translateX(100%); } to { transform: translateX(0); } }
.mobile-nav__close { margin-left: auto; display: flex; width: 40px; height: 40px; align-items: center; justify-content: center; border-radius: 999px; border: 2px solid var(--line); background: #fff; cursor: pointer; }
.mobile-nav__group { margin-top: 18px; }
.mobile-nav__group-title { font-family: var(--font-display); font-size: 13px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; color: var(--ink-faint); padding: 0 6px; }
.mobile-nav__link { display: block; padding: 13px 6px; font-size: 17px; font-weight: 700; color: var(--ink); border-bottom: 1px solid var(--line); }
.mobile-nav__cta { margin-top: 22px; }

/* Mobile sticky enquire bar */
.mobile-sticky-cta {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 90; display: none;
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  background: rgba(255,255,255,.94); backdrop-filter: blur(10px);
  border-top: 1px solid var(--line); box-shadow: 0 -6px 20px rgba(120,60,190,.1);
}
.mobile-sticky-cta .btn { width: 100%; }
@media (max-width: 760px) { .mobile-sticky-cta { display: block; } body { padding-bottom: 74px; } }