.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--color-border-translucent);
  background: var(--surface-backdrop);
  backdrop-filter: blur(18px);
  transform: translateY(0);
  transition:
    transform 260ms cubic-bezier(0.2, 0.8, 0.25, 1),
    box-shadow 180ms ease,
    background-color 180ms ease;
  will-change: transform;
}

.site-header.is-scrolled {
  box-shadow: 0 10px 30px rgba(33, 33, 33, 0.08);
}

.site-header.is-hidden {
  transform: translateY(calc(-100% - 1px));
}

.nav {
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 800;
}

.brand__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.brand__text {
  display: grid;
  line-height: 1.1;
}

.brand__sub {
  color: var(--color-text-tertiary);
  font-size: 12px;
  font-weight: 600;
}

.nav__toggle {
  display: inline-flex;
  width: var(--touch-target);
  height: var(--touch-target);
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-paper);
  color: var(--color-text);
}

.nav__toggle-lines,
.nav__toggle-lines::before,
.nav__toggle-lines::after {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: currentColor;
  content: "";
}

.nav__toggle-lines {
  position: relative;
}

.nav__toggle-lines::before,
.nav__toggle-lines::after {
  position: absolute;
  left: 0;
}

.nav__toggle-lines::before {
  top: -6px;
}

.nav__toggle-lines::after {
  top: 6px;
}

.nav__links {
  position: fixed;
  inset: 64px var(--space-4) auto;
  display: none;
  grid-template-columns: 1fr;
  gap: var(--space-1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-paper);
  padding: var(--space-2);
  box-shadow: var(--shadow-soft);
}

.nav__links.is-open {
  display: grid;
}

.nav__links a {
  min-height: var(--touch-target);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 700;
}

.nav__links a:hover {
  background: var(--yc-gray-100);
}

.nav__links a[aria-current="page"] {
  background: var(--yc-gray-100);
  color: var(--color-text);
}

.button {
  display: inline-flex;
  width: 100%;
  min-height: var(--touch-target-large);
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  overflow-wrap: anywhere;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button--primary {
  background: var(--yc-primary-600);
  color: var(--color-inverse);
  box-shadow: var(--shadow-blue);
}

.button--primary:hover {
  background: var(--yc-primary-700);
  color: var(--color-inverse);
}

.button--secondary {
  border-color: var(--color-border);
  background: var(--color-paper);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}

.button--disabled,
.button[aria-disabled="true"] {
  cursor: not-allowed;
  border-color: var(--color-border);
  background: var(--yc-gray-100);
  color: var(--color-text-tertiary);
  box-shadow: none;
}

.button--disabled:hover,
.button[aria-disabled="true"]:hover {
  transform: none;
}

.app-store-badge {
  display: inline-flex;
  width: min(100%, 180px);
  color: var(--color-inverse);
  line-height: 0;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.app-store-badge:hover {
  color: var(--color-inverse);
}

.app-store-badge__image {
  display: block;
  width: 100%;
  height: auto;
  pointer-events: none;
  user-select: none;
  -webkit-user-drag: none;
}

.card-grid {
  display: grid;
  gap: var(--space-4);
}

.feature-card,
.support-card,
.legal-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-paper);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}

.feature-card__icon {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  margin-bottom: var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--yc-primary-50);
  color: var(--yc-primary-700);
  font-weight: 800;
}

.app-demo {
  position: relative;
  --app-demo-frame-radius: clamp(34px, 4vw, 42px);
  --app-demo-screen-radius: clamp(24px, 3vw, 31px);
  --app-demo-width: clamp(260px, 20vw, 304px);
  --app-demo-height-cap: calc((100svh - 150px) * 272 / 492);
  width: min(100%, var(--app-demo-width), var(--app-demo-height-cap));
  min-width: 0;
  margin-inline: auto;
  border: 1px solid rgba(33, 33, 33, 0.14);
  border-radius: var(--app-demo-frame-radius);
  background: linear-gradient(180deg, #41464d 0%, #191c22 24%, #0f1116 100%);
  padding: clamp(12px, 1.2vw, 16px) clamp(9px, 0.9vw, 12px) clamp(9px, 0.8vw, 12px);
  box-shadow:
    0 28px 56px rgba(15, 17, 21, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.16);
  isolation: isolate;
  overflow: hidden;
}

.app-demo__viewport {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  aspect-ratio: 272 / 492;
  border-radius: var(--app-demo-screen-radius);
  background: var(--color-paper);
  overflow: hidden;
  overflow: clip;
  clip-path: inset(0 round var(--app-demo-screen-radius));
  -webkit-mask-image: -webkit-radial-gradient(white, black);
  contain: paint;
  transform: translateZ(0);
}

.app-demo__viewport > .app-demo__frame {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: transparent;
}

.app-demo::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 4;
  border-radius: var(--app-demo-frame-radius);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.08),
    inset 0 0 0 5px rgba(255, 255, 255, 0.03);
  pointer-events: none;
}

.faq {
  display: grid;
  gap: var(--space-3);
}

.faq details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-paper);
  padding: 0 var(--space-4);
}

.faq summary {
  min-height: var(--touch-target-large);
  cursor: pointer;
  padding: var(--space-4) 0;
  color: var(--color-text);
  font-weight: 800;
}

.faq details p {
  margin-bottom: var(--space-4);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-paper);
  padding: var(--space-8) 0;
}

.site-footer--outro {
  position: relative;
  display: grid;
  align-items: center;
  overflow: hidden;
  border-top: 0;
  background: var(--yc-gray-950);
  color: var(--color-inverse);
  padding: var(--space-12) 0 var(--space-8);
}

.footer-outro {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-6);
  justify-items: center;
  padding-bottom: var(--space-12);
  text-align: center;
}

.footer-outro__copy {
  display: grid;
  gap: var(--space-4);
  max-width: 640px;
  justify-items: center;
}

.footer-outro__availability {
  margin: 0;
  color: var(--yc-primary-300);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.footer-outro h2 {
  margin: 0;
  color: var(--color-inverse);
  font-size: clamp(30px, 7vw, 48px);
  line-height: 1.12;
}

.footer-outro h2 em {
  color: var(--yc-primary-300);
  font-style: italic;
}

.footer-outro p {
  margin: 0;
  color: var(--color-inverse-muted);
}

.footer-outro__copy > p:last-child {
  max-width: 480px;
  font-size: 16px;
  line-height: 1.6;
}

.footer-outro__badge {
  justify-self: center;
}

.footer-grid {
  display: grid;
  gap: var(--space-5);
}

.footer-grid--outro {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--color-border-inverse);
  padding-top: var(--space-6);
}

.footer-brand strong {
  color: var(--color-inverse);
}

.footer-brand p {
  margin: var(--space-2) 0 0;
  color: var(--color-inverse-subtle);
  font-size: 14px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 700;
}

.site-footer--outro .footer-links {
  color: var(--color-inverse-tertiary);
  font-size: 13px;
}

.site-footer--outro .footer-links a:hover {
  color: var(--yc-primary-300);
}

.footer-links a[aria-current="page"] {
  color: var(--color-text);
}

.site-footer--outro .footer-links a[aria-current="page"] {
  color: var(--color-inverse);
}

@keyframes pulseDot {
  0%,
  100% {
    box-shadow: 0 0 0 7px rgba(86, 209, 255, 0.16);
  }

  50% {
    box-shadow: 0 0 0 11px rgba(86, 209, 255, 0.08);
  }
}

@keyframes progressPulse {
  0%,
  100% {
    width: 54%;
  }

  50% {
    width: 64%;
  }
}

@media (min-width: 760px) {
  .nav__toggle {
    display: none;
  }

  .nav__links {
    position: static;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    border: 0;
    background: transparent;
    padding: 0;
    box-shadow: none;
  }

  .nav__links a {
    min-height: 38px;
    padding: var(--space-2) var(--space-3);
  }

  .button {
    width: auto;
    padding: 0 var(--space-5);
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .footer-outro {
    padding-bottom: var(--space-16);
  }
}

@media (min-width: 760px) {
  .app-demo {
    --app-demo-width: clamp(276px, 21vw, 320px);
    --app-demo-height-cap: calc((100svh - 170px) * 272 / 492);
  }
}

@media (min-width: 1020px) {
  .card-grid--three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}