/* =============================================================================
   AdStar landing — nav.css  (sticky top bar + mobile overlay menu)
   ========================================================================== */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background-color var(--dur) var(--ease-out),
              box-shadow var(--dur) var(--ease-out),
              height var(--dur) var(--ease-out),
              backdrop-filter var(--dur) var(--ease-out);
}
.nav__inner {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav__left { display: flex; align-items: center; gap: clamp(28px, 5vw, 96px); }

/* Scrolled state: translucent full-width bg, blur, shadow (per spec) */
.nav.is-scrolled {
  height: 72px;
  background: rgba(10, 10, 10, 0.6);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.06), 0 8px 28px rgba(0, 0, 0, 0.45);
}

/* ---- Logo (combined AdStar wordmark SVG) -------------------------------- */
.logo { display: inline-flex; align-items: center; }
.logo--wordmark { width: 108px; }
.logo__img { width: 100%; height: auto; display: block; }
@media (max-width: 767px) { .logo--wordmark { width: 96px; } }

/* ---- Desktop menu -------------------------------------------------------- */
.nav__menu { display: flex; align-items: center; gap: clamp(20px, 3.2vw, 60px); }
.nav__menu a {
  font-size: var(--fs-sm);
  line-height: var(--lh-sm);
  font-weight: 500;
  color: var(--gray-25);
  white-space: nowrap;
  position: relative;
  transition: color var(--dur-fast) var(--ease-out);
}
.nav__menu a::after {
  content: "";
  position: absolute; left: 0; right: 100%; bottom: -6px; height: 2px;
  background: var(--brand-600);
  transition: right var(--dur) var(--ease-out);
}
.nav__menu a:hover { color: #fff; }
.nav__menu a:hover::after { right: 0; }

.nav__cta { flex-shrink: 0; }

/* ---- Mobile hamburger ---------------------------------------------------- */
.nav__burger {
  display: none;
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
  margin-right: -8px;
}
/* Three-bar icon that morphs to a cross via plain CSS transforms (reliable
   across browsers — no SVG transform-box quirks). */
.nav__burger-box { position: relative; width: 24px; height: 16px; }
.nav__burger-bar {
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  background: var(--gray-25);
  border-radius: 2px;
  transform-origin: center;
  transition: transform var(--dur) var(--ease-out), opacity var(--dur-fast) var(--ease-out);
}
.nav__burger-bar:nth-child(1) { top: 0; }
.nav__burger-bar:nth-child(2) { top: 7px; }
.nav__burger-bar:nth-child(3) { top: 14px; }
/* Open: top + bottom bars converge to the centre line and cross; middle fades. */
.nav__burger.is-x .nav__burger-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.is-x .nav__burger-bar:nth-child(2) { opacity: 0; transform: scaleX(0.2); }
.nav__burger.is-x .nav__burger-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Mobile overlay menu ------------------------------------------------- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;            /* under the fixed nav bar so burger stays visible */
  background: var(--black);
  padding: calc(var(--nav-h-mobile) + 32px) var(--gutter-mobile) 40px;
  display: flex;
  flex-direction: column;
  gap: 28px;
  transform: translateX(100%);
  visibility: hidden;
  transition: transform var(--dur) var(--ease-out), visibility 0s linear var(--dur);
}
.mobile-menu.is-open {
  transform: none; visibility: visible;
  transition: transform var(--dur) var(--ease-out);
}
.mobile-menu__list { display: flex; flex-direction: column; gap: 28px; }
.mobile-menu__list a {
  font-size: 28px; line-height: 1; font-weight: 700; color: var(--gray-25);
}
.mobile-menu__divider { height: 1px; background: var(--border); margin-block: 4px; }
.mobile-menu .btn { align-self: flex-start; }

@media (max-width: 767px) {
  .nav { height: var(--nav-h-mobile); }
  .nav.is-scrolled { height: var(--nav-h-mobile); }
  .nav__menu, .nav__cta { display: none; }
  .nav__burger { display: inline-flex; }
}

/* Lock scroll behind the open overlay */
body.menu-open { overflow: hidden; }