.page-about {
  --about-cut: 18px;
  background: linear-gradient(180deg, #F7FAFC 0%, #EDF2F7 100%);
  color: var(--c-deep);
  overflow-x: clip;
}

.page-about .about-intro {
  padding: 56px 0 40px;
  position: relative;
}

.page-about .about-intro::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-main) 60%, transparent 100%);
}

.page-about .about-intro .breadcrumb {
  margin-bottom: 28px;
}

.page-about .about-title-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .about-filecode {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--c-stone);
  border: 1px dashed rgba(74, 85, 104, .4);
  padding: 4px 10px;
}

.page-about .about-title-block h1 {
  font-family: var(--font-heading);
  font-size: clamp(26px, 4.6vw, 38px);
  line-height: 1.3;
  margin: 0 0 18px;
  color: var(--c-deep);
  letter-spacing: .01em;
  max-width: 900px;
}

.page-about .about-title-block h1::after {
  content: "";
  display: block;
  width: 96px;
  height: 4px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--c-gold), var(--c-gold-light));
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.page-about .about-lead {
  max-width: 760px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-stone);
}

.page-about .timeline-section {
  padding: 24px 0 72px;
}

.page-about .timeline-layout {
  position: relative;
  display: grid;
  gap: 32px;
}

.page-about .timeline-svg {
  display: none;
}

.page-about .timeline-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .timeline-index__label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-stone);
  border-right: 1px solid rgba(27, 79, 138, .25);
  padding-right: 12px;
  margin-right: 4px;
  align-self: center;
}

.page-about .timeline-index__item {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-main);
  text-decoration: none;
  border: 1px solid rgba(27, 79, 138, .28);
  padding: 8px 12px;
  background: rgba(247, 250, 252, .7);
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}

.page-about .timeline-index__item:hover,
.page-about .timeline-index__item:focus-visible {
  background: var(--c-deep);
  color: var(--c-white);
  border-color: var(--c-deep);
}

.page-about .timeline-main {
  min-width: 0;
  position: relative;
  z-index: 1;
}

.page-about .timeline-head h2,
.page-about .brand-path-section h2,
.page-about .data-lab-section h2,
.page-about .ecosystem-section h2,
.page-about .continue-section h2 {
  font-family: var(--font-heading);
  font-size: 26px;
  line-height: 1.35;
  margin: 0 0 12px;
  color: var(--c-deep);
}

.page-about .timeline-head p,
.page-about .brand-path-section > .container > p,
.page-about .data-lab-section > .container > p,
.page-about .ecosystem-section > .container > p {
  color: var(--c-stone);
  line-height: 1.8;
  max-width: 720px;
  margin-bottom: 24px;
}

.page-about .timeline-hero-img {
  margin: 0 0 32px;
}

.page-about .archive-stack {
  display: grid;
  gap: 18px;
  margin-bottom: 40px;
}

.page-about .archive-card {
  background: var(--c-white);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
  box-shadow: 0 8px 24px rgba(10, 31, 60, .06);
  scroll-margin-top: 96px;
  transition: background var(--transition), box-shadow var(--transition);
}

.page-about .archive-card[open] {
  background: #FFFFFF;
  box-shadow: 0 12px 28px rgba(10, 31, 60, .1);
}

.page-about .archive-card__head {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 18px 20px;
  cursor: pointer;
  user-select: none;
}

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

.page-about .archive-card__no {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-gold);
  letter-spacing: .06em;
}

.page-about .archive-card__name {
  font-family: var(--font-heading);
  font-size: 18px;
  color: var(--c-deep);
}

.page-about .archive-card__tag {
  margin-left: auto;
  font-size: 13px;
}

.page-about .archive-card__hint {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-stone);
  border: 1px dashed rgba(74, 85, 104, .4);
  padding: 2px 6px;
}

.page-about .archive-card[open] .archive-card__hint {
  display: none;
}

.page-about .archive-card__arrow {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--c-main);
  border-bottom: 2px solid var(--c-main);
  transform: rotate(45deg);
  transition: transform .3s ease;
  flex: 0 0 auto;
}

.page-about .archive-card[open] .archive-card__arrow {
  transform: rotate(225deg);
}

.page-about .archive-card__detail {
  padding: 12px 20px 20px;
  border-top: 1px dashed rgba(27, 79, 138, .18);
}

.page-about .archive-card__detail p {
  margin: 8px 0 0;
  color: var(--c-stone);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .archive-medal {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-items: center;
  background: var(--c-deep);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
  padding: 20px;
  margin: 0 0 40px;
}

.page-about .archive-medal__frame {
  display: block;
  margin: 0;
}

.page-about .archive-medal figcaption {
  color: rgba(247, 250, 252, .85);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .archive-medal__title {
  display: block;
  font-family: var(--font-mono);
  color: var(--c-gold);
  font-size: 13px;
  margin-bottom: 6px;
  letter-spacing: .08em;
}

.page-about .full-archive {
  padding-top: 8px;
}

.page-about .full-archive h3 {
  font-size: 18px;
  margin: 0 0 8px;
  color: var(--c-deep);
}

.page-about .archive-note {
  color: var(--c-stone);
  font-size: 14px;
  line-height: 1.8;
  margin: 0 0 18px;
  max-width: 640px;
}

.page-about .archive-grid {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.page-about .archive-grid__item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  background: rgba(247, 250, 252, .9);
  border: 1px solid rgba(27, 79, 138, .12);
  padding: 10px 12px;
  font-size: 13px;
  color: var(--c-deep);
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}

.page-about .archive-grid__item:hover {
  border-color: var(--c-gold);
  background: #FFFFFF;
  transform: translateY(-2px);
}

.page-about .archive-grid__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-main);
}

.page-about .brand-path-section {
  background: #FFFFFF;
  padding: 72px 0;
  border-top: 1px solid rgba(27, 79, 138, .08);
  border-bottom: 1px solid rgba(27, 79, 138, .08);
}

.page-about .milestone-track {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 20px;
  border-left: 2px solid var(--c-gold);
  display: grid;
  gap: 28px;
}

.page-about .milestone-card {
  position: relative;
  background: rgba(247, 250, 252, .85);
  border: 1px solid rgba(27, 79, 138, .1);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  padding: 20px 22px;
}

.page-about .milestone-card::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 22px;
  width: 12px;
  height: 12px;
  background: var(--c-gold);
  transform: rotate(45deg);
  box-shadow: 0 0 0 3px rgba(217, 166, 46, .25);
}

.page-about .milestone-card__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--c-main);
  letter-spacing: .06em;
  margin-bottom: 8px;
}

.page-about .milestone-card__title {
  display: block;
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--c-deep);
}

.page-about .milestone-card p {
  margin: 0;
  color: var(--c-stone);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .data-lab-section {
  padding: 72px 0;
}

.page-about .lab-grid {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .lab-img {
  margin: 0;
}

.page-about .process-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .process-item {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  align-items: start;
  background: var(--c-white);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  padding: 20px;
}

.page-about .process-item__step {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--c-gold);
  line-height: 1;
}

.page-about .process-item__body h3 {
  font-size: 16px;
  margin: 0 0 6px;
  color: var(--c-deep);
}

.page-about .process-item__body p {
  margin: 0;
  color: var(--c-stone);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .ecosystem-section {
  background: var(--c-deep);
  color: rgba(247, 250, 252, .88);
  padding: 72px 0;
}

.page-about .ecosystem-section h2 {
  color: #FFFFFF;
}

.page-about .ecosystem-section > .container > p {
  color: rgba(247, 250, 252, .72);
}

.page-about .eco-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 32px 0;
}

.page-about .eco-stats .data-card {
  background: rgba(27, 79, 138, .35);
  border: 1px solid rgba(217, 166, 46, .35);
}

.page-about .eco-stats .data-card__value {
  color: var(--c-gold-light);
}

.page-about .eco-stats .data-card__label {
  color: rgba(247, 250, 252, .7);
}

.page-about .eco-partners {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .eco-partner {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-left: 2px solid var(--c-gold);
  padding: 10px 14px;
  background: rgba(255, 255, 255, .05);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .eco-partner strong {
  color: #FFFFFF;
}

.page-about .honor-panel {
  border: 1px solid rgba(217, 166, 46, .4);
  background: rgba(217, 166, 46, .08);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  padding: 22px;
}

.page-about .honor-panel__title {
  font-family: var(--font-mono);
  color: var(--c-gold);
  font-size: 13px;
  letter-spacing: .08em;
  display: block;
  margin-bottom: 8px;
}

.page-about .honor-panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 250, 252, .85);
}

.page-about .continue-section {
  background: var(--c-white);
  padding: 64px 0 72px;
}

.page-about .continue-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.page-about .continue-card {
  display: block;
  text-decoration: none;
  background: #FFFFFF;
  border: 1px solid rgba(27, 79, 138, .14);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  padding: 18px;
  color: var(--c-deep);
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}

.page-about .continue-card:hover,
.page-about .continue-card:focus-visible {
  border-color: var(--c-gold);
  transform: translateY(-2px);
}

.page-about .continue-card strong {
  display: block;
  font-size: 15px;
  margin-bottom: 6px;
  color: var(--c-main);
}

.page-about .continue-card span {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-stone);
}

.page-about .continue-card em {
  display: block;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-gold);
  margin-top: 10px;
}

@media (min-width: 768px) {
  .page-about .about-intro {
    padding: 72px 0 56px;
  }

  .page-about .timeline-layout {
    grid-template-columns: 180px 1fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .timeline-svg {
    display: block;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 190px;
    width: 20px;
    height: auto;
    pointer-events: none;
    z-index: 0;
    opacity: .3;
  }

  .page-about .timeline-index {
    flex-direction: column;
    gap: 10px;
    position: sticky;
    top: 24px;
    align-self: start;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .timeline-index__label {
    border-right: 0;
    border-bottom: 1px solid rgba(27, 79, 138, .25);
    padding: 0 0 10px;
    margin: 0 0 4px;
  }

  .page-about .timeline-index__item {
    padding: 10px 14px;
  }

  .page-about .archive-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .archive-medal {
    grid-template-columns: 200px 1fr;
  }

  .page-about .milestone-track {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .page-about .lab-grid {
    grid-template-columns: 5fr 4fr;
    gap: 40px;
  }

  .page-about .eco-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .eco-partners {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .continue-links {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .timeline-layout {
    grid-template-columns: 200px 1fr;
  }

  .page-about .timeline-svg {
    left: 210px;
  }

  .page-about .archive-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .page-about .milestone-track {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .archive-card__arrow,
  .page-about .archive-grid__item,
  .page-about .continue-card,
  .page-about .timeline-index__item {
    transition: none;
  }

  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}