/* 产品页 —— 复用主站 token */

.product-page {
  /* 顶栏高度保持稳定，避免子导航 sticky/fixed 时漏缝 */
  --nav-h-scrolled: var(--nav-h);
  --product-subnav-h: 48px;
}

.product-page .page-hero,
.product-page .section,
.product-page .final-cta {
  position: relative;
  z-index: 2;
}

.product-name {
  color: var(--accent);
  font-weight: 700;
}

/* 产品子导航：固定贴在主导航下方，不漏空 */
.product-subnav {
  position: fixed;
  top: calc(var(--nav-h) + var(--safe-top, 0px));
  left: 0;
  right: 0;
  z-index: 99;
  height: var(--product-subnav-h);
  display: flex;
  align-items: center;
  margin: 0;
  background: rgba(6, 10, 18, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-top: none;
  border-bottom: 1px solid var(--line);
}

.product-page .site-nav.is-open ~ .product-subnav,
.product-page.nav-open .product-subnav {
  z-index: 90;
}

.product-page .site-nav {
  border-bottom-color: transparent;
}

.product-page .site-nav.scrolled {
  border-bottom-color: transparent;
}

.product-page .page-hero {
  padding-top: calc(var(--nav-h) + var(--safe-top, 0px) + var(--product-subnav-h) + var(--space-4));
  min-height: calc(100vh - var(--product-subnav-h));
  min-height: calc(100dvh - var(--product-subnav-h));
}

.product-page .section {
  scroll-margin-top: calc(var(--nav-h) + var(--safe-top, 0px) + var(--product-subnav-h) + 12px);
}

.product-subnav-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 22px;
  padding: 0;
  width: min(100% - (var(--gutter, 48px) * 2), var(--max));
  margin-inline: auto;
}

.product-subnav a {
  font-size: var(--text-sm);
  color: var(--muted);
  font-weight: 500;
  padding: 10px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--dur-fast), border-color var(--dur-fast);
}

.product-subnav a:hover,
.product-subnav a.is-active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.product-hero-shot {
  margin-bottom: var(--space-5);
}

.product-hero-shot img {
  aspect-ratio: 16 / 9;
}

.block-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  margin: var(--space-5) 0 var(--space-3);
}

.demo-slot {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(13, 22, 38, 0.65);
  margin-bottom: var(--space-5);
}

.demo-slot h3 {
  font-family: var(--font-display);
  margin: 0 0 10px;
}

.demo-slot p {
  color: var(--muted);
  margin: 0 0 var(--space-3);
  font-size: 0.95rem;
}

.demo-slot-frame {
  min-height: 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: #060a12;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.demo-video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #060a12;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.value-card {
  padding: var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(13, 22, 38, 0.55);
}

.value-card h4 {
  font-family: var(--font-display);
  margin: 0 0 8px;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.value-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.deploy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.deploy-card h4 {
  font-family: var(--font-display);
  margin: var(--space-2) 0 8px;
}

.deploy-card > p {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0 0 12px;
}

.deploy-card ul {
  margin: 0;
  padding-left: 1.1em;
  color: var(--muted);
  font-size: 0.9rem;
}

.deploy-card li { margin-bottom: 6px; }

.synergy {
  margin-bottom: var(--space-6);
  padding: var(--space-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(6, 10, 18, 0.45);
}

.synergy .block-title { margin-top: 0; }

.synergy-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--space-2);
}

.synergy-node {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface);
  font-weight: 600;
  font-size: var(--text-sm);
}

.synergy-node.accent {
  border-color: rgba(94, 200, 255, 0.45);
  color: var(--accent);
  background: var(--accent-soft);
}

.synergy-arrow {
  color: var(--muted);
  font-size: 1.1rem;
}

.synergy-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 70ch;
}

.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: center;
  padding: var(--space-5) 0;
  border-top: 1px solid var(--line);
}

.feature-detail.reverse {
  direction: rtl;
}

.feature-detail.reverse > * {
  direction: ltr;
}

.feature-detail h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin: 0 0 14px;
  letter-spacing: -0.02em;
}

.feature-problem {
  color: var(--text);
  margin: 0 0 12px;
  font-size: 0.95rem;
}

.feature-detail-copy > p {
  color: var(--muted);
  margin: 0 0 12px;
  font-size: 0.95rem;
}

.feature-bullets {
  margin: 0;
  padding-left: 1.1em;
  color: var(--muted);
  font-size: 0.92rem;
}

.feature-bullets li { margin-bottom: 6px; }

.arch-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  margin: var(--space-5) 0;
}

.arch-card {
  padding: var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(13, 22, 38, 0.55);
}

.arch-card h4 {
  font-family: var(--font-display);
  margin: 0 0 8px;
  color: var(--accent);
}

.arch-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

.check-list {
  margin: 0;
  padding-left: 1.1em;
  color: var(--muted);
}

.check-list li {
  margin-bottom: 10px;
  line-height: 1.55;
}

.roadmap-horizon {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.horizon-card {
  padding: var(--space-4) var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(13, 22, 38, 0.55);
}

.horizon-card.featured {
  border-color: rgba(94, 200, 255, 0.4);
  background: linear-gradient(160deg, #101c30, rgba(13, 22, 38, 0.85));
}

.horizon-card h3 {
  font-family: var(--font-display);
  margin: 0 0 var(--space-2);
  font-size: 1.2rem;
}

.horizon-card ul {
  margin: 0;
  padding-left: 1.1em;
  color: var(--muted);
  font-size: 0.92rem;
}

.horizon-card li { margin-bottom: 8px; }

@media (max-width: 980px) {
  .value-grid,
  .deploy-grid,
  .feature-detail,
  .feature-detail.reverse,
  .arch-grid,
  .two-col,
  .roadmap-horizon,
  .demo-slot {
    grid-template-columns: 1fr;
    direction: ltr;
  }

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

  .demo-slot {
    padding: var(--space-3);
    gap: var(--space-3);
  }

  .feature-detail {
    gap: var(--space-3);
    padding: var(--space-4) 0;
  }

  .feature-detail h3 {
    font-size: 1.3rem;
  }

  .synergy {
    padding: var(--space-3);
  }

  .synergy-flow {
    gap: 8px;
  }

  .synergy-arrow {
    display: none;
  }

  .product-page .page-hero {
    min-height: auto;
  }
}

@media (max-width: 560px) {
  .arch-grid {
    grid-template-columns: 1fr;
  }

  .product-page {
    --product-subnav-h: 48px;
  }

  .product-subnav-inner {
    gap: 0 16px;
    overflow-x: auto;
    flex-wrap: nowrap;
    width: 100%;
    max-width: none;
    margin: 0;
    padding:
      0
      max(16px, var(--safe-right, 0px))
      0
      max(16px, var(--safe-left, 0px));
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .product-subnav-inner::-webkit-scrollbar {
    display: none;
  }

  .product-subnav-inner::after {
    content: "";
    flex: 0 0 8px;
  }

  .product-subnav a {
    white-space: nowrap;
    padding: 10px 0;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    scroll-snap-align: start;
    font-size: 0.875rem;
  }

  .demo-slot-frame {
    aspect-ratio: 16 / 9;
  }

  .demo-video {
    object-fit: contain;
  }

  .value-card,
  .arch-card,
  .horizon-card {
    padding: var(--space-3) var(--space-2);
  }

  .block-title {
    font-size: 1.2rem;
    margin-top: var(--space-4);
  }

  .roadmap-horizon {
    gap: var(--space-3);
  }

  .feature-copy ul {
    padding-left: 1.1rem;
  }

  .product-hero-shot {
    margin-inline: 0;
  }
}