.product-nav {
  position: sticky;
  z-index: 90;
  top: var(--header-height);
  border-bottom: 1px solid var(--color-line);
  background: rgba(247, 247, 248, 0.94);
  backdrop-filter: saturate(140%) blur(14px);
}

.product-nav__inner {
  min-height: var(--product-nav-height);
  display: flex;
  align-items: center;
  gap: 18px;
}

.product-nav__name {
  margin-right: auto;
  font-size: 1rem;
  font-weight: 700;
  white-space: nowrap;
}

.product-nav__links {
  display: flex;
  align-items: center;
  gap: 18px;
  overflow-x: auto;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  white-space: nowrap;
  scrollbar-width: none;
}

.product-nav__links::-webkit-scrollbar {
  display: none;
}

.product-nav__links a {
  transition: color 160ms ease;
}

.product-nav__links a:hover {
  color: var(--color-text);
}

.product-nav__cta {
  min-height: 34px;
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  flex: 0 0 auto;
  border: 1px solid rgba(37, 99, 235, 0.22);
  border-radius: 999px;
  background: #fff;
  color: var(--color-accent);
  font-size: 0.8rem;
  font-weight: 680;
}

.product-nav__cta:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.product-hero {
  padding: clamp(64px, 7vw, 88px) 0 clamp(56px, 6vw, 80px);
  overflow: hidden;
  background: linear-gradient(180deg, #fff, var(--color-surface-soft));
}

.product-hero__layout {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(500px, 1.18fr);
  align-items: center;
  gap: clamp(44px, 6vw, 76px);
}

.product-hero__copy h1 {
  font-size: clamp(2.75rem, 5vw, 3.5rem);
}

.product-hero__tagline {
  max-width: 600px;
  margin: 16px 0 18px;
  color: var(--color-text);
  font-size: clamp(1.45rem, 2.4vw, 2rem);
  font-weight: 630;
  letter-spacing: -0.03em;
  line-height: 1.25;
}

.product-hero__description {
  max-width: 610px;
  margin-bottom: 0;
}

.product-hero__status {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.product-hero__status span {
  padding: 7px 11px;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: #fff;
  color: var(--color-text-soft);
  font-size: 0.8rem;
  font-weight: 650;
}

.product-hero__visual {
  min-width: 0;
}

.product-hero__visual img {
  width: 100%;
  filter: drop-shadow(0 18px 34px rgba(18, 24, 40, 0.08));
}

.product-feature-list {
  display: grid;
  gap: clamp(56px, 7vw, 88px);
}

.product-feature {
  display: grid;
  grid-template-columns: minmax(0, 0.76fr) minmax(500px, 1.24fr);
  align-items: center;
  gap: clamp(44px, 6vw, 76px);
}

.product-feature--reverse {
  grid-template-columns: minmax(500px, 1.24fr) minmax(0, 0.76fr);
}

.product-feature--reverse .product-feature__copy {
  order: 2;
}

.product-feature h3 {
  margin: 12px 0 14px;
  font-size: clamp(1.4rem, 2.2vw, 1.75rem);
}

.product-feature__copy p:last-child {
  margin-bottom: 0;
}

.product-feature__visual {
  min-width: 0;
}

.product-feature__visual img {
  width: 100%;
}

.secondary-features {
  margin-top: 42px;
  padding-top: 28px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  border-top: 1px solid var(--color-line);
}

.secondary-features article {
  padding: 22px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-soft);
}

.secondary-features h3 {
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.secondary-features p {
  margin-bottom: 0;
  font-size: 0.9rem;
}

.workflow {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  list-style: none;
}

.workflow li {
  position: relative;
  min-height: 132px;
  padding: 20px 18px;
  border-top: 1px solid var(--color-line-strong);
}

.workflow li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: -4px;
  right: -4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.workflow span {
  display: block;
  margin-bottom: 24px;
  color: var(--color-text-muted);
  font-size: 0.7rem;
}

.workflow strong {
  font-size: 0.96rem;
  line-height: 1.45;
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.scene-grid article {
  padding: 24px;
  border-radius: var(--radius-md);
  background: #fff;
}

.scene-grid h3 {
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.scene-grid p {
  margin-bottom: 0;
  font-size: 0.92rem;
}

.current-release {
  margin-bottom: 52px;
  padding: clamp(24px, 4vw, 40px);
  display: grid;
  grid-template-columns: minmax(190px, 0.5fr) minmax(0, 1.5fr);
  gap: clamp(30px, 5vw, 58px);
  border-radius: var(--radius-lg);
  background: var(--color-text);
  color: #fff;
}

.current-release > div:first-child > strong {
  display: block;
  font-size: clamp(2.9rem, 6vw, 4.4rem);
  letter-spacing: -0.055em;
  line-height: 1;
}

.current-release > div:first-child > span {
  margin-top: 12px;
  display: inline-block;
  color: #b9e5c6;
  font-size: 0.78rem;
  font-weight: 650;
}

.current-release h3 {
  margin-bottom: 12px;
  color: #fff;
  font-size: clamp(1.4rem, 2.2vw, 1.75rem);
}

.current-release p {
  color: #c3c5ca;
}

.current-release .boundary-note {
  margin-bottom: 0;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  font-size: 0.8rem;
}

.version-columns {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: clamp(42px, 6vw, 76px);
}

.subsection-title {
  margin-bottom: 24px;
  font-size: 1.4rem;
}

.timeline {
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 0;
  left: 5px;
  width: 1px;
  background: var(--color-line-strong);
}

.timeline-item {
  position: relative;
  padding: 0 0 34px 32px;
}

.timeline-item__marker {
  position: absolute;
  z-index: 1;
  top: 7px;
  left: 0;
  width: 11px;
  height: 11px;
  border: 3px solid #fff;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent);
}

.timeline-item__version {
  margin: 12px 0 5px;
  color: var(--color-text);
  font-size: 0.82rem;
  font-weight: 720;
}

.timeline-item h3 {
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.timeline-item p:last-child {
  margin-bottom: 0;
}

.timeline-item--older {
  display: none;
}

.timeline:has(+ .history-details[open]) .timeline-item--older {
  display: block;
}

.history-details {
  margin-top: -10px;
  padding: 16px 0;
  border-top: 1px solid var(--color-line);
}

.history-details summary {
  color: var(--color-accent);
  cursor: pointer;
  font-weight: 650;
}

.history-details p {
  margin: 8px 0 0;
  font-size: 0.84rem;
}

.progress-list {
  display: grid;
  gap: 12px;
}

.progress-list .update-card {
  padding: 20px;
  background: var(--color-surface);
}

.faq-list {
  border-top: 1px solid var(--color-line);
}

.faq-list details {
  border-bottom: 1px solid var(--color-line);
}

.faq-list summary {
  position: relative;
  padding: 20px 40px 20px 0;
  color: var(--color-text);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 650;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  color: var(--color-text-muted);
  font-size: 1.4rem;
  font-weight: 400;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list details p {
  margin: -2px 0 20px;
  padding-right: 40px;
}

.product-cta {
  padding: clamp(72px, 8vw, 96px) 0;
  text-align: center;
}

.product-cta h2 {
  font-size: clamp(2rem, 3.4vw, 2.6rem);
}

@media (max-width: 1050px) {
  .product-hero__layout,
  .product-feature,
  .product-feature--reverse {
    grid-template-columns: 1fr;
  }

  .product-feature--reverse .product-feature__copy {
    order: 0;
  }

  .product-hero__visual,
  .product-feature__visual {
    max-width: 820px;
  }

  .secondary-features,
  .scene-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .workflow {
    grid-template-columns: 1fr;
  }

  .workflow li {
    min-height: auto;
    padding: 18px 0 18px 36px;
    border-top: 0;
    border-left: 1px solid var(--color-line-strong);
  }

  .workflow li:not(:last-child)::after {
    top: auto;
    right: auto;
    bottom: -4px;
    left: -4px;
  }

  .workflow span {
    margin-bottom: 5px;
  }

  .version-columns {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .product-nav__inner {
    width: 100%;
    min-height: var(--product-nav-height);
    padding: 6px 18px;
    gap: 12px;
  }

  .product-nav__name {
    font-size: 0.92rem;
  }

  .product-nav__links {
    min-width: 0;
    gap: 15px;
  }

  .product-nav__cta {
    min-height: 32px;
    padding-inline: 11px;
  }

  .product-hero {
    padding: 48px 0;
  }

  .product-hero__layout {
    gap: 34px;
  }

  .product-hero__copy h1 {
    font-size: clamp(2.25rem, 10vw, 2.75rem);
  }

  .product-feature-list {
    gap: 52px;
  }

  .product-feature {
    gap: 26px;
  }

  .secondary-features,
  .scene-grid {
    grid-template-columns: 1fr;
  }

  .current-release {
    grid-template-columns: 1fr;
  }
}