html { scroll-padding-top: 88px; }

.top-nav {
  position: fixed;
  z-index: 220;
  top: 0;
  right: 0;
  left: 0;
  padding: max(12px, env(safe-area-inset-top)) clamp(16px, 3vw, 42px) 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(5, 5, 5, 0.68);
  backdrop-filter: blur(20px) saturate(125%);
  -webkit-backdrop-filter: blur(20px) saturate(125%);
}

.nav-shell {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) auto minmax(180px, 1fr);
  align-items: center;
  gap: 28px;
  width: min(1360px, 100%);
  min-height: 46px;
  margin: 0 auto;
}

.brand-logo {
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(22px, 2.6vw, 38px);
}

.nav-links a {
  position: relative;
  min-height: 44px;
  padding: 13px 0 10px;
  color: rgba(255, 255, 255, 0.68);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.015em;
  text-decoration: none;
}

.nav-links a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 7px;
  left: 0;
  height: 1px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: right;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a[aria-current="location"] { color: rgba(255, 255, 255, 0.94); }

.nav-links a:hover::after,
.nav-links a:focus-visible::after,
.nav-links a[aria-current="location"]::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-actions {
  display: flex;
  justify-self: end;
  align-items: center;
  gap: 10px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.92);
  background: rgba(255, 255, 255, 0.06);
  cursor: pointer;
}

.nav-toggle-bars {
  display: grid;
  gap: 5px;
  width: 16px;
  margin: 0 auto;
}

.nav-toggle-bars i {
  display: block;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: transform 180ms ease-out, opacity 180ms ease-out;
}

.top-nav.is-open .nav-toggle-bars i:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.top-nav.is-open .nav-toggle-bars i:nth-child(2) {
  opacity: 0;
}

.top-nav.is-open .nav-toggle-bars i:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

.top-nav .nav-cta {
  min-height: 44px;
  padding-inline: 17px 15px;
  border-color: rgba(255, 255, 255, 0.92);
  color: #070707;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: none;
  text-decoration: none;
}

.top-nav .nav-cta:hover,
.top-nav .nav-cta:focus-visible {
  border-color: white;
  color: #050505;
  background: white;
  transform: translateY(-1px);
}

.mobile-nav {
  display: none;
}

#demo,
#product-story,
#product-demo,
#metrics,
#workflow,
#record,
#pricing,
#faq,
#launch,
#waitlist { scroll-margin-top: 88px; }

/* Keep the final product-demo state clean and let the landscape phone dominate. */
.trajectory,
.tracking-reticle { display: none; }

.final-copy {
  top: max(92px, calc(env(safe-area-inset-top) + 76px));
  width: min(760px, calc(100% - 48px));
}

.final-copy h2 {
  font-size: clamp(44px, 5.4vw, 78px);
  line-height: 0.94;
}

.final-copy .eyebrow { margin-bottom: 12px; }

.final-copy .supporting-copy {
  max-width: 460px;
  margin-top: 16px;
  font-size: clamp(13px, 1.05vw, 16px);
  line-height: 1.5;
}

.measurement-stage {
  top: 52%;
  width: min(72vw, 1040px);
  transform: translate(-50%, -38%);
}

.result-readout { bottom: clamp(22px, 3.4vw, 48px); }

.scroll-cue { display: none !important; }

@media (max-width: 980px) {
  .nav-shell {
    grid-template-columns: 1fr auto;
    gap: 12px;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: inline-grid;
    place-items: center;
  }

  .mobile-nav {
    display: grid;
    position: fixed;
    z-index: 219;
    top: calc(max(12px, env(safe-area-inset-top)) + 58px);
    right: clamp(14px, 3vw, 24px);
    left: clamp(14px, 3vw, 24px);
    gap: 4px;
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 18px;
    background: rgba(8, 8, 9, 0.96);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition:
      opacity 180ms ease-out,
      transform 180ms cubic-bezier(0.22, 1, 0.36, 1);
  }

  .top-nav.is-open .mobile-nav {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .mobile-nav a {
    display: flex;
    min-height: 48px;
    padding: 0 14px;
    align-items: center;
    border-radius: 12px;
    color: rgba(255, 255, 255, 0.82);
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
  }

  .mobile-nav a:hover,
  .mobile-nav a:focus-visible {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
  }

  .mobile-nav a[aria-current="location"] {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.1);
  }
}

@media (max-width: 820px) {
  .final-copy {
    top: max(88px, calc(env(safe-area-inset-top) + 70px));
    width: calc(100% - 36px);
  }

  .final-copy h2 { font-size: clamp(38px, 9.5vw, 58px); }

  .final-copy .supporting-copy {
    max-width: 350px;
    font-size: 12.5px;
  }

  .measurement-stage {
    top: 58%;
    width: 94vw;
  }
}

@media (max-width: 560px) {
  html { scroll-padding-top: 78px; }

  .top-nav { padding: max(9px, env(safe-area-inset-top)) 14px 9px; }

  .nav-shell {
    min-height: 42px;
    gap: 12px;
  }

  .brand-logo {
    width: 25px;
    height: 25px;
  }

  .top-nav .brand {
    gap: 8px;
    font-size: 11px;
    letter-spacing: 0.12em;
  }

  .top-nav .nav-cta span:last-child {
    display: none;
  }

  #demo,
  #product-story,
  #product-demo,
  #metrics,
  #workflow,
  #record,
  #pricing,
  #faq,
  #launch,
  #waitlist { scroll-margin-top: 78px; }

  .final-copy { top: max(80px, calc(env(safe-area-inset-top) + 62px)); }
  .final-copy h2 { font-size: clamp(34px, 10vw, 48px); }

  .final-copy .eyebrow,
  .final-copy .supporting-copy { display: none; }

  .measurement-stage {
    top: 59%;
    width: 98vw;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mobile-nav,
  .nav-toggle-bars i {
    transition: none;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .top-nav {
    background: #080808;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .mobile-nav {
    background: #0c0c0d;
  }
}