.page-about {
  --about-pad-x: 20px;
  font-family: var(--font-body);
  color: var(--color-dark);
  background: var(--color-white);
}

.page-about .breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 18px var(--about-pad-x) 0;
  font-size: 13px;
}

.page-about .breadcrumb__item {
  color: var(--color-dark);
  text-decoration: none;
}

.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--color-blue);
  font-weight: 600;
}

.page-about .breadcrumb__sep {
  font-family: var(--font-mono);
  color: var(--color-orange);
  margin: 0 8px;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  margin-top: 14px;
  background: linear-gradient(135deg, var(--color-deepblue) 0%, var(--color-blue) 66%, #245b86 100%);
  color: var(--color-white);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -90px;
  width: 320px;
  height: 320px;
  border: 1px solid rgba(176, 196, 222, 0.18);
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px var(--about-pad-x) 40px;
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--color-green);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  max-width: 860px;
  font-family: var(--font-display);
  font-size: clamp(28px, 5.2vw, 56px);
  line-height: 1.08;
}

.page-about .about-hero__title-main {
  color: var(--color-white);
}

.page-about .about-hero__title-sep {
  color: var(--color-orange);
}

.page-about .about-hero__title-brand {
  color: var(--color-green);
}

.page-about .about-hero__title-sub {
  color: rgba(176, 196, 222, 0.92);
}

.page-about .about-hero__lead {
  max-width: 620px;
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(248, 249, 250, 0.86);
}

.page-about .about-hero__aside {
  display: none;
  position: absolute;
  right: 20px;
  top: 32px;
  text-align: right;
}

.page-about .about-hero__big {
  display: block;
  font-family: var(--font-display);
  font-size: 150px;
  line-height: 0.78;
  color: rgba(176, 196, 222, 0.14);
  -webkit-text-stroke: 1px rgba(176, 196, 222, 0.34);
}

.page-about .about-hero__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(176, 196, 222, 0.72);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  max-width: 1200px;
  margin: 0 auto;
  border-top: 2px solid var(--color-green);
  background: var(--color-deepblue);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column-reverse;
  padding: 16px 18px;
  border-right: 1px solid rgba(176, 196, 222, 0.2);
  border-bottom: 1px solid rgba(176, 196, 222, 0.2);
}

.page-about .about-stats__item:nth-child(2n) {
  border-right: 0;
}

.page-about .about-stats dt,
.page-about .about-stats dd {
  margin: 0;
}

.page-about .about-stats__label {
  font-size: 12px;
  color: rgba(248, 249, 250, 0.72);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--color-green);
  margin-bottom: 4px;
}

.page-about .about-chapters {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(248, 249, 250, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(176, 196, 222, 0.6);
}

.page-about .about-chapters__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px var(--about-pad-x);
}

.page-about .about-chapters__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-orange);
  white-space: nowrap;
  border-left: 3px solid var(--color-green);
  padding-left: 8px;
}

.page-about .about-chapters__list {
  display: flex;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-chapters__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-chapters__link {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  padding: 6px 10px;
  font-size: 14px;
  color: var(--color-dark);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.page-about .about-chapters__link:hover {
  color: var(--color-blue);
  border-bottom-color: var(--color-green);
}

.page-about .about-chapters__index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-orange);
}

.page-about .about-chapters__contact {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-blue);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--color-blue);
  padding: 6px 12px;
  transition: background var(--transition), color var(--transition);
}

.page-about .about-chapters__contact:hover {
  background: var(--color-blue);
  color: var(--color-white);
}

.page-about .about-section {
  padding: 56px var(--about-pad-x);
  border-bottom: 1px solid var(--color-bluegray);
  scroll-margin-top: 64px;
}

.page-about .about-section__inner {
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .about-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 28px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-bluegray);
}

.page-about .about-section__index {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-orange);
}

.page-about .about-section__head h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.15;
  color: var(--color-blue);
  margin: 0;
}

.page-about .about-section__tag {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-dark);
  opacity: 0.55;
}

.page-about .about-figure {
  margin: 0;
}

.page-about .about-frame {
  border: 1px solid var(--color-bluegray);
  background: var(--color-cream);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 10px 4px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--color-dark);
}

.page-about .about-story__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-story__content > p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-dark);
}

.page-about .about-story__content .about-story__lead {
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.55;
  color: var(--color-blue);
  border-left: 3px solid var(--color-green);
  padding-left: 16px;
}

.page-about .about-story__quote {
  margin: 22px 0 0;
  padding: 16px 18px;
  background: var(--color-cream);
  border-right: 4px solid var(--color-orange);
}

.page-about .about-story__quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-dark);
}

.page-about .about-milestones {
  background: var(--color-cream);
}

.page-about .about-timeline {
  list-style: none;
  position: relative;
  max-width: 860px;
  margin: 0 0 36px;
  padding: 4px 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-green) 0%, var(--color-blue) 46%, var(--color-bluegray) 74%, var(--color-orange) 100%);
  opacity: 0.7;
}

.page-about .about-timeline__item {
  position: relative;
  margin-left: 40px;
  margin-bottom: 18px;
}

.page-about .about-timeline__item:last-child {
  margin-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 0 3px rgba(0, 230, 118, 0.25), 0 0 0 5px var(--color-cream);
  z-index: 2;
}

.page-about .about-timeline__card {
  border: 1px solid var(--color-bluegray);
  background: var(--color-white);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.page-about .about-timeline__card[open] {
  border-color: var(--color-green);
  box-shadow: var(--shadow);
}

.page-about .about-timeline__summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  align-items: baseline;
  padding: 18px 18px 16px;
}

.page-about .about-timeline__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline__summary:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: -2px;
}

.page-about .about-timeline__phase {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-orange);
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-blue);
}

.page-about .about-timeline__teaser {
  grid-column: 1 / -1;
  font-size: 13px;
  color: var(--color-dark);
  opacity: 0.8;
}

.page-about .about-timeline__expand {
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-orange);
}

.page-about .about-timeline__expand::before {
  content: "展开";
}

.page-about .about-timeline__card[open] .about-timeline__expand::before {
  content: "收起";
}

.page-about .about-timeline__body {
  margin-top: 4px;
  padding: 0 18px 18px;
  border-top: 1px dashed var(--color-bluegray);
}

.page-about .about-timeline__body p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-dark);
}

.page-about .about-milestones__media {
  max-width: 680px;
  margin: 8px auto 0;
}

.page-about .about-business__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-business__card {
  position: relative;
  border: 1px solid var(--color-bluegray);
  border-top: 4px solid var(--color-blue);
  background: var(--color-white);
  padding: 22px 20px 20px;
  transition: box-shadow var(--transition), transform var(--transition);
}

.page-about .about-business__card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.page-about .about-business__card:nth-child(2) {
  border-top-color: var(--color-green);
}

.page-about .about-business__card:nth-child(3) {
  border-top-color: var(--color-orange);
}

.page-about .about-business__card:nth-child(4) {
  border-top-color: var(--color-dark);
}

.page-about .about-business__num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-orange);
}

.page-about .about-business__chip {
  position: absolute;
  top: 18px;
  right: 16px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-blue);
  border-left: 3px solid var(--color-green);
  background: var(--color-white);
}

.page-about .about-business__card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--color-blue);
}

.page-about .about-business__card p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-dark);
}

.page-about .about-business__link {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-blue);
  text-decoration: none;
}

.page-about .about-business__link:hover {
  color: var(--color-orange);
}

.page-about .about-team {
  background: var(--color-cream);
}

.page-about .about-team__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-team__content > p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-dark);
}

.page-about .about-team__content .about-team__lead {
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-blue);
}

.page-about .about-team__values {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-team__values li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--color-white);
  border: 1px solid var(--color-bluegray);
  padding: 14px 16px;
}

.page-about .about-team__value-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-orange);
  border: 1px solid var(--color-orange);
}

.page-about .about-team__values strong {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--color-blue);
}

.page-about .about-team__values p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-dark);
}

.page-about .about-qualify__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-qualify__card {
  position: relative;
  border: 1px solid var(--color-bluegray);
  background: var(--color-white);
  padding: 22px 20px 20px;
}

.page-about .about-qualify__icon {
  position: absolute;
  top: 22px;
  right: 18px;
  font-size: 13px;
  color: var(--color-green);
}

.page-about .about-qualify__card h3 {
  margin: 0 0 8px;
  padding-right: 34px;
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--color-blue);
}

.page-about .about-qualify__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-dark);
}

.page-about .about-qualify__note {
  max-width: 860px;
  margin: 24px 0 0;
  padding: 14px 16px;
  background: var(--color-cream);
  border-left: 3px solid var(--color-orange);
  font-size: 14px;
  color: var(--color-dark);
}

.page-about .about-qualify__note a {
  color: var(--color-blue);
  font-weight: 600;
}

.page-about .about-cta {
  padding: 64px var(--about-pad-x);
  background: var(--color-deepblue);
  color: var(--color-white);
}

.page-about .about-cta__inner {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.page-about .about-cta__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--color-green);
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 28px;
  line-height: 1.2;
  color: var(--color-white);
}

.page-about .about-cta p {
  max-width: 520px;
  margin: 0 auto 24px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(248, 249, 250, 0.8);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.page-about .about-cta .btn--primary {
  background: var(--color-green);
  border-color: var(--color-green);
  color: var(--color-deepblue);
}

.page-about .about-cta .btn--primary:hover {
  background: var(--color-white);
  border-color: var(--color-white);
  color: var(--color-deepblue);
}

.page-about .about-cta .btn--ghost {
  border-color: rgba(248, 249, 250, 0.6);
  color: var(--color-white);
}

.page-about .about-cta .btn--ghost:hover {
  background: rgba(248, 249, 250, 0.12);
  border-color: var(--color-white);
  color: var(--color-white);
}

.page-about a:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 2px;
}

@media (min-width: 800px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-stats__item:nth-child(2n) {
    border-right: 1px solid rgba(176, 196, 222, 0.2);
  }

  .page-about .about-stats__item:last-child {
    border-right: 0;
  }

  .page-about .about-stats__item {
    border-bottom: 0;
  }

  .page-about .about-story__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-business__grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-team__grid {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-qualify__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .page-about .about-section {
    padding: 72px var(--about-pad-x);
  }

  .page-about .about-hero__inner {
    padding-top: 60px;
    padding-bottom: 52px;
  }

  .page-about .about-timeline__item {
    margin-left: 48px;
  }

  .page-about .about-timeline__item::before {
    left: -44px;
  }

  .page-about .about-timeline {
    margin-bottom: 40px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__aside {
    display: block;
  }
}

@media (max-width: 560px) {
  .page-about .about-chapters__contact {
    display: none;
  }
}