.blue-light-page,
.blue-light-page *,
.blue-light-page *::before,
.blue-light-page *::after {
  box-sizing: border-box;
}

.blue-light-page {
  --bl-ink: #2C252B;
  --bl-muted: #989898;
  --bl-soft: #f6f6f6;
  --bl-line: #e5e5e5;
  --bl-accent: #e25f3d;
  color: var(--bl-ink);
  font-size: 16px;
  line-height: normal;
  overflow: hidden;
}

.blue-light-page img {
  display: block;
  height: auto;
  max-width: 100%;
}

.blue-light-page h1,
.blue-light-page h2,
.blue-light-page h3,
.blue-light-page p {
  margin: 0;
}

.bl-container {
  margin-left: auto;
    margin-right: auto;
    width: 100%;
    max-width: 1398px;
    padding-left: 1rem;
    padding-right: 1rem;
}

.bl-container--wide {
  max-width: 1450px;
}

.bl-hero {
  position: relative;
}

.bl-hero picture,
.bl-hero img {
  display: block;
  width: 100%;
}

.bl-hero__copy {
  color: #fff;
  left: 50%;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
}

.bl-hero__copy h1 {
  font-size: 72px;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.08;
  white-space: nowrap;
}

.bl-hero__copy p {
  font-size: 24px;
  margin-top: 13px;
  max-width: 710px;
}

.bl-intro {
  background: #fff;
  padding: clamp(48px, 3.65vw, 70px) 0 clamp(62px, 4.7vw, 90px);
  text-align: center;
}

.bl-intro__lead {
  font-size: 18px;
  margin-inline: auto;
  max-width: 1363px;
}

.bl-benefits {
  display: grid;
  gap: clamp(28px, 4.15vw, 80px);
  grid-template-columns: repeat(4, minmax(0, 1fr));
  list-style: none;
  margin: clamp(42px, 3.15vw, 60px) auto 0;
  max-width: 1050px;
  padding: 0;
}

.bl-benefits li {
  align-items: center;
  display: flex;
  flex-direction: column;
  font-size: 16px;
  gap: 20px;
}

.bl-benefits picture,
.bl-benefits img {
  height: 80px;
  object-fit: contain;
  width: 100px;
}

.bl-spectrum {
  background: var(--bl-soft);
  padding: clamp(62px, 4.7vw, 90px) 0 clamp(72px, 5.2vw, 100px);
}

.bl-section-header {
  margin: 0 auto clamp(62px, 4.2vw, 80px);
  max-width: 1290px;
  text-align: center;
}

.bl-section-header h2,
.bl-section-title,
.bl-photochromic h2 {
  color: var(--bl-ink);
  font-size: clamp(26px, 2vw, 42px);
  font-weight: 600;
  line-height: 1.2;
}

.bl-section-header p {
  font-size: 18px;
  margin-top: 18px;
}

.bl-spectrum__row {
  align-items: center;
  display: grid;
  gap: clamp(50px, 4.17vw, 80px);
  grid-template-columns: minmax(0, 1.6fr) minmax(330px, 1fr);
}

.bl-spectrum__row--bottom {
  grid-template-columns: minmax(330px, 1fr) minmax(0, 1.6fr);
  margin-top: clamp(58px, 4.17vw, 80px);
}

.bl-spectrum__copy h3 {
  font-size: clamp(20px, 1.35vw, 26px);
  font-weight: 600;
  margin-bottom: 15px;
}

.bl-spectrum__copy p {
  font-size: 14px;
  line-height: 1.55;
}

.bl-spectrum__media,
.bl-spectrum__media img {
  width: 100%;
}

.bl-spectrum__media--bar {
  align-self: center;
}

.bl-spectrum-expandable > button {
  display: none;
}

.bl-sources {
  background: #fff;
  padding: clamp(65px, 4.7vw, 90px) 0 clamp(76px, 5.2vw, 100px);
}

.bl-sources .bl-section-title {
  margin-bottom: 20px;
  font-size: clamp(26px, 1.56vw, 30px);
  text-align: center;
}

.bl-source-list {
  display: grid;
  gap: 40px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.bl-source-card img {
  aspect-ratio: 430 / 480;
  object-fit: cover;
  width: 100%;
}

.bl-source-card h3 {
  font-size: 22px;
  font-weight: 500;
  margin-top: 12px;
}

.bl-source-card p {
  font-size: 16px;
  margin-top: 6px;
}

.bl-technologies {
  background: #fff;
  padding-bottom: clamp(86px, 6.25vw, 120px);
}

.bl-technology-grid {
  display: grid;
  gap: 78px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.bl-technology-card {
  background: var(--bl-soft);
  padding: 50px 35px;
}

.bl-technology-card h2 {
  font-size: clamp(23px, 1.46vw, 26px);
  font-weight: 600;
  line-height: 1.25;
  min-height: 70px;
}

.bl-technology-card picture {
  display: block;
  margin-top: 16px;
}

.bl-technology-card picture,
.bl-technology-card img {
  width: 100%;
}

.bl-technology-card h3 {
  font-size: 18px;
  font-weight: 500;
  margin-top: 20px;
}

.bl-technology-card p {
  font-size: 16px;
  margin-top: 12px;
}

.bl-photochromic {
  background: #fff;
  padding-bottom: clamp(88px, 7.3vw, 140px);
}

.bl-photochromic__layout {
  align-items: center;
  display: grid;
  gap: clamp(60px, 5.2vw, 100px);
  grid-template-columns: minmax(360px, 0.88fr) minmax(0, 1.5fr);
}

.bl-photochromic__copy > p {
  font-size: 16px;
  margin-top: 18px;
}

.bl-photochromic__copy a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.bl-photochromic__copy h3 {
  font-size: 16px;
  font-weight:500;
  margin-top: 32px;
}

.bl-copy-clamp {
  font-size: 16px;
  margin-top: 12px;
}

.bl-copy-clamp__toggle {
  position: absolute;
  right: 0;
  bottom: 0;
  background: #fff;
  border: 0;
  color: var(--bl-muted);
  cursor: pointer;
  display: none;
  font: inherit;
  padding: 0 0 0 4px;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.bl-photochromic__media {
  aspect-ratio: 800 / 350;
  display: block;
  height: auto;
  object-fit: contain;
  width: 100%;
}

.bl-note {
  margin-bottom: clamp(70px, 5.2vw, 100px);
  padding: 50px 80px;
  background: var(--bl-soft);
}

.bl-note .bl-copy-clamp {
  position: relative;
  font-size: 16px;
  margin: 0;
}
.bl-note .bl-copy-clamp__toggle{
  background: var(--bl-soft);
}
.bl-collection .weidu-topic-collection {
  padding-bottom: clamp(44px, 3.65vw, 70px);
  padding-top: 0;
}


/* Reuse the Progressive Lenses FAQ visual language. */
.blue-light-page .faq-page,
.blue-light-page .faq-page *,
.blue-light-page .faq-page *::before,
.blue-light-page .faq-page *::after {
  box-sizing: border-box;
}

.blue-light-page .faq-page {
  background-color: #fff;
  padding-bottom: 4px;
}

.blue-light-page .faq-pl-container {
  margin: 0 auto;
  max-width: 1370px;
  padding: 54px 24px 72px;
}

.blue-light-page .faq-title {
  animation: blueLightFaqFadeIn 400ms ease-out forwards;
  color: #1a1a1a;
  font-size: clamp(24px, 1.87vw, 36px);
  font-weight: 600;
  margin-bottom: 40px;
  text-align: center;
}

.blue-light-page .faq-item {
  animation: blueLightFaqStaggerIn 300ms ease-out forwards;
  opacity: 0;
  transform: translateY(10px);
}

.blue-light-page .faq-item:nth-child(1) { animation-delay: 100ms; }
.blue-light-page .faq-item:nth-child(2) { animation-delay: 150ms; }
.blue-light-page .faq-item:nth-child(3) { animation-delay: 200ms; }
.blue-light-page .faq-item:nth-child(4) { animation-delay: 250ms; }
.blue-light-page .faq-item:nth-child(5) { animation-delay: 300ms; }
.blue-light-page .faq-item:nth-child(6) { animation-delay: 350ms; }
.blue-light-page .faq-item:nth-child(7) { animation-delay: 400ms; }

.blue-light-page .faq-question {
  align-items: center;
  background: none;
  border: 0;
  cursor: pointer;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  outline: none;
  padding: 18px 0;
  text-align: left;
  transition: background-color 150ms ease;
  width: 100%;
}

.blue-light-page .faq-question:hover {
  background-color: rgba(0, 0, 0, 0.015);
}

.blue-light-page .faq-question:focus-visible {
  outline: 2px solid var(--bl-accent);
  outline-offset: 3px;
}

.blue-light-page .faq-question-text {
  color: #1a1a1a;
  flex: 1;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.4;
}

.blue-light-page .faq-chevron {
  align-items: center;
  color: var(--bl-accent);
  display: inline-flex;
  flex-shrink: 0;
  justify-content: center;
  transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

.blue-light-page .faq-chevron svg {
  height: 20px;
  width: 20px;
}

.blue-light-page .faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.blue-light-page .faq-answer-wrapper {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 300ms cubic-bezier(0.4, 0, 0.2, 1), opacity 200ms ease;
}

.blue-light-page .faq-item.open .faq-answer-wrapper {
  opacity: 1;
}

.blue-light-page .faq-answer-content {
  padding: 0 0 8px;
}

.blue-light-page .faq-answer-text,
.blue-light-page .faq-answer-text p {
  color: #333;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.7;
}

.blue-light-page .faq-answer-text p {
  margin: 0 0 12px;
}

.blue-light-page .bl-faq .faq-answer-content a {
  text-decoration: underline;
}

.blue-light-page .faq-divider {
  background-color: var(--bl-line);
  height: 1px;
  width: 100%;
}

@keyframes blueLightFaqFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes blueLightFaqStaggerIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 767px) {
  .blue-light-page {
    font-size: 14px;
  }

  .bl-container,
  .bl-container--wide,
  .bl-container--technology {
    max-width: none;
    
  }

  .bl-hero img {
    width: 100%;
  }

  .bl-hero__copy {
    left: 50%;
    top: 50px;
    transform: translateX(-50%);
    width: calc(100% - 40px);
  }

  .bl-hero__copy h1 {
    font-size: clamp(24px, 7.7vw,34px);
    font-weight: 700;
    letter-spacing: -0.045em;
    line-height: 1.08;
    white-space: nowrap;
  }

  .bl-hero__copy p {
    font-size: clamp(12px, 7.9vw, 16px);
    margin-top: 9px;
  }

  .bl-intro {
    padding: 28px 0 35px;
  }

  .bl-intro__lead {
    font-size: 16px;
  }

  .bl-benefits {
  grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-top: 24px;
  }

  .bl-benefits li {
    font-size: clamp(12px, 3.7vw, 16px);
    gap: 12px;
    text-align: center;
  }

  .bl-benefits picture,
  .bl-benefits img {
    height: 48px;
    width: 60px;
  }

  .bl-spectrum {
    padding: 34px 0 40px;
  }

  .bl-section-header {
    margin-bottom: 30px;
    text-align: left;
  }

  .bl-section-header h2,
  .bl-section-title,
  .bl-photochromic h2 {
    font-size: clamp(22px, 6vw, 26px);
  }

  .bl-section-header p {
    font-size: 16px;
    margin-top: 10px;
  }

  .bl-spectrum__row,
  .bl-spectrum__row--bottom {
    display: flex;
    flex-direction: column;
    gap: 22px;
  }

  .bl-spectrum__row--bottom {
    margin-top: 32px;
  }

  .bl-spectrum__copy {
    width: 100%;
  }

  .bl-spectrum__copy h3 {
    font-size: 20px;
    margin-bottom: 12px;
  }

  .bl-spectrum__copy p {
    font-size: 16px;
    line-height: 1.48;
  }

  .bl-spectrum__media--bar {
    order: -1;
  }

  .bl-spectrum__media--filter {
    order: -1;
  }

  .bl-spectrum-expandable.is-enhanced {
    position: relative;
  }

  .bl-spectrum-expandable.is-enhanced:not(.is-expanded) > p {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;
  }

  .bl-spectrum-expandable.is-enhanced > button {
    display: block;
    margin: 4px 0 0 auto;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--bl-muted);
    font-size: 12px;
    cursor: pointer;
  }

  .bl-spectrum-expandable.is-enhanced:not(.is-expanded) > button {
    position: absolute;
    right: 0;
    bottom: 0;
    margin: 0;
    padding-left: 8px;
    background: var(--bl-soft);
    font-size: 12px;
    line-height: 22px;

  }

  .bl-spectrum-expandable.is-enhanced:not(.is-expanded) > button::before {
    content: '… ';
  }

  .bl-spectrum-expandable > button:focus-visible {
    outline: 2px solid var(--bl-ink);
    outline-offset: 3px;
  }

  .bl-sources {
    padding: 38px 0 45px;
  }

  .bl-sources .bl-section-title {
    margin-bottom: 15px;
    font-size: 26px;
    text-align: left;
  }

  .bl-source-list {
    display: flex;
    gap: 12px;
    margin-right: -16px;
    overflow-x: auto;
    padding-bottom: 6px;
    scroll-snap-type: x proximity;
    scrollbar-width: none;
  }

  .bl-source-list::-webkit-scrollbar {
    display: none;
  }

  .bl-source-card {
    flex: 0 0 calc(100vw - 70px);
    scroll-snap-align: start;
  }

  .bl-source-card h3 {
    font-size: 20px;
  }

  .bl-source-card p {
    font-size: 16px;
  }

  .bl-technologies {
    padding-bottom: 48px;
  }

  .bl-technology-grid {
    gap: 20px;
    grid-template-columns: 1fr;
  }

  .bl-technology-card {
    margin-inline: -16px;
    padding: 40px 20px;
  }

  .bl-technology-card picture {
    margin-top: 16px;
  }

  .bl-photochromic {
    padding-bottom: 40px;
  }

  .bl-photochromic__layout {
    display: flex;
    flex-direction: column;
    gap: 28px;
  }

  .bl-photochromic__copy > p {
    margin-top: 8px;
  }

  .bl-photochromic__copy h3 {
    margin-top: 16px;
  }

  .bl-copy-clamp {
    margin-top: 11px;
  }
  .bl-copy-clamp__text{
    position: relative;
  }
  .bl-copy-clamp:not(.is-expanded) .bl-copy-clamp__text {
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    display: -webkit-box;
    overflow: hidden;
  }

  .bl-copy-clamp__toggle {
    display: block;
    margin-left: auto;
    margin-top: 2px;
  }

  .bl-note {
    margin-bottom: 38px;
    padding: 17px 16px;
    text-align: left;
    width: calc(100% - 32px);
  }


  .bl-note .bl-copy-clamp:not(.is-expanded) .bl-copy-clamp__text {
    -webkit-line-clamp: 2;
  }

  .bl-collection .weidu-topic-collection {
    padding-bottom: 30px;
  }

}