/* WHY NOW / 产业趋势：标题比例与中央编辑标尺结构 */
.challenge .section-heading {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto 70px;
  text-align: center;
}

.challenge .section-heading .eyebrow {
  margin: 0 0 18px;
  color: #32c5ff;
  font-size: 15px !important;
  font-weight: 500;
  letter-spacing: .08em;
}

.challenge .section-heading h2 {
  max-width: 1200px !important;
  margin: 0 auto 20px;
  color: #f5f8fc;
  font-size: clamp(52px, 4.25vw, 60px) !important;
  font-weight: 600 !important;
  line-height: 1.18 !important;
  text-align: center;
}

.challenge .section-heading > p:last-child {
  max-width: 820px;
  margin: 0 auto;
  color: rgba(226, 235, 245, .72);
  font-size: 18px !important;
  line-height: 1.7;
  text-align: center;
}

.challenge .challenge-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px minmax(0, 1fr) !important;
  column-gap: 28px !important;
  align-items: stretch;
  overflow: visible !important;
  border: 0 !important;
  border-radius: 0 !important;
  background: transparent !important;
  box-shadow: none !important;
}

.challenge .challenge-side {
  position: relative;
  z-index: 1;
  min-width: 0;
  height: 100%;
  margin: 0 !important;
}

/* 隔离旧版 bridge 方框、旋转和发光规则。 */
.challenge .bridge-blueprint {
  position: relative !important;
  z-index: 0;
  display: grid !important;
  grid-template-rows: 1fr auto 1fr;
  align-items: stretch;
  justify-items: center;
  align-self: stretch;
  width: 100% !important;
  max-width: 180px !important;
  min-width: 0 !important;
  min-height: 100% !important;
  margin: 0 !important;
  padding: 0 !important;
  overflow: visible !important;
  border: 0 !important;
  border-radius: 0 !important;
  background: transparent !important;
  box-shadow: none !important;
  filter: none !important;
  clip-path: none !important;
  transform: none !important;
}

.challenge .bridge-blueprint::before,
.challenge .bridge-blueprint::after {
  content: none !important;
}

.challenge .bridge-blueprint > div {
  position: relative !important;
  inset: auto !important;
  width: auto !important;
  height: auto !important;
  min-width: 0 !important;
  min-height: 0 !important;
  margin: 0 !important;
  padding: 0 !important;
  overflow: visible !important;
  border: 0 !important;
  border-radius: 0 !important;
  background: transparent !important;
  box-shadow: none !important;
  filter: none !important;
  clip-path: none !important;
  transform: none !important;
}

.challenge .bridge-blueprint > div > * {
  transform: none !important;
  writing-mode: horizontal-tb !important;
}

.challenge .bridge-axis {
  display: flex !important;
  flex-direction: column;
  align-items: center;
  width: 100% !important;
  color: rgba(230, 238, 247, .76);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.2;
  text-align: center;
}

.challenge .bridge-axis span {
  display: block;
  color: inherit;
  font: inherit;
  white-space: nowrap;
}

.challenge .bridge-axis i {
  display: block;
  flex: 1 1 auto;
  width: 1px;
  min-height: 24px;
  background: rgba(116, 153, 190, .28);
  transform: scaleY(0) !important;
  transition: transform 400ms cubic-bezier(.16, 1, .3, 1);
}

.challenge .bridge-axis-top span {
  margin-bottom: 14px;
}

.challenge .bridge-axis-bottom i {
  margin-bottom: 14px;
}

.challenge .bridge-dimension {
  display: grid !important;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  width: 100% !important;
  max-width: 180px !important;
}

.challenge .bridge-segment {
  position: relative !important;
  display: flex !important;
  align-items: center;
  width: 100% !important;
  min-width: 0;
}

.challenge .bridge-segment span {
  position: absolute;
  bottom: calc(50% + 12px);
  color: rgba(202, 216, 231, .56);
  font-size: 12px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: .04em;
  white-space: nowrap;
}

.challenge .bridge-segment-left span {
  right: 4px;
}

.challenge .bridge-segment-right span {
  left: 4px;
}

.challenge .bridge-segment i {
  position: relative;
  display: block;
  width: 100%;
  height: 1px;
  background: rgba(137, 167, 199, .48);
  transform: scaleX(0) !important;
  transition: background-color 220ms ease,
              transform 400ms cubic-bezier(.16, 1, .3, 1);
}

.challenge .bridge-segment i::after {
  position: absolute;
  top: 50%;
  width: 1px;
  height: 12px;
  background: rgba(180, 202, 224, .66);
  content: "";
  opacity: 0;
  transform: translateY(-50%);
  transition: opacity 180ms ease 360ms;
}

.challenge .bridge-segment-left i {
  transform-origin: right center !important;
}

.challenge .bridge-segment-left i::after {
  right: 0;
}

.challenge .bridge-segment-right i {
  transform-origin: left center !important;
}

.challenge .bridge-segment-right i::after {
  left: 0;
}

.challenge .bridge-marker {
  display: flex !important;
  flex-direction: column;
  align-items: center;
  width: max-content !important;
  margin: 0 12px !important;
  text-align: center;
}

.challenge .bridge-marker b {
  display: block;
  width: max-content;
  padding: 11px 16px;
  border: 1px solid rgba(153, 184, 216, .58);
  border-radius: 8px;
  background: rgba(7, 25, 45, .96);
  box-shadow: 0 8px 24px rgba(0, 8, 20, .15);
  color: #f5f8fc;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.2;
  white-space: nowrap;
  opacity: 0;
  transition: border-color 220ms ease, opacity 220ms ease;
}

.challenge .bridge-marker small {
  display: block;
  margin-top: 16px;
  color: rgba(50, 197, 255, .82);
  font-size: 15px;
  font-weight: 400;
  line-height: 1.2;
  text-align: center;
  white-space: nowrap;
  opacity: 0;
  transition: color 220ms ease, opacity 180ms ease 160ms;
}

.challenge .bridge-blueprint.is-visible .bridge-axis i {
  transform: scaleY(1) !important;
}

.challenge .bridge-blueprint.is-visible .bridge-segment i {
  transform: scaleX(1) !important;
}

.challenge .bridge-blueprint.is-visible .bridge-segment i::after,
.challenge .bridge-blueprint.is-visible .bridge-marker b,
.challenge .bridge-blueprint.is-visible .bridge-marker small {
  opacity: 1;
}

.challenge .bridge-blueprint:hover .bridge-segment i {
  background: rgba(164, 190, 216, .78);
}

.challenge .bridge-blueprint:hover .bridge-marker b {
  border-color: rgba(178, 205, 231, .76);
}

.challenge .bridge-blueprint:hover .bridge-marker small {
  color: #32c5ff;
}

@media (max-width: 900px) {
  .challenge .section-heading {
    margin-bottom: 54px;
  }

  .challenge .section-heading h2 {
    font-size: clamp(38px, 8vw, 52px) !important;
  }

  .challenge .section-heading > p:last-child {
    font-size: 17px !important;
  }

  .challenge .challenge-grid {
    grid-template-columns: minmax(0, 1fr) !important;
    row-gap: 24px !important;
  }

  .challenge .bridge-blueprint {
    grid-template-rows: 1fr auto 1fr;
    width: 180px !important;
    max-width: 180px !important;
    min-height: 236px !important;
    margin: 0 auto !important;
  }

  .challenge .bridge-dimension {
    display: flex !important;
    justify-content: center;
    width: auto !important;
  }

  .challenge .bridge-segment {
    display: none !important;
  }

  .challenge .bridge-marker {
    margin: 0 !important;
  }
}

@media (max-width: 600px) {
  .challenge .section-heading {
    margin-bottom: 42px;
  }

  .challenge .section-heading h2 {
    font-size: clamp(34px, 10vw, 44px) !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  .challenge .bridge-axis i,
  .challenge .bridge-segment i,
  .challenge .bridge-segment i::after,
  .challenge .bridge-marker b,
  .challenge .bridge-marker small {
    transition-duration: 1ms !important;
    transition-delay: 0ms !important;
  }
}