.page-about {
  --about-hair: rgba(200, 255, 61, .28);
  overflow-x: clip;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 28px);
}
.page-about .about-crumb a {
  color: var(--teal);
  text-decoration: none;
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--lime);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(18px, 3vw, 34px) 0 clamp(30px, 5vw, 64px);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}
.page-about .about-hero__main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .about-hero__rail {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  line-height: 1.6;
  color: var(--silver);
  border-left: 2px solid var(--lime);
  padding-left: 10px;
}
.page-about .about-hero__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8vw, 76px);
  line-height: 1.03;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-about .about-hero__title em {
  font-style: normal;
  color: var(--lime);
  box-shadow: inset 0 -.16em 0 rgba(200, 255, 61, .14);
}
.page-about .about-hero__lead {
  margin: 0 0 22px;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--silver);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-hero__media {
  position: relative;
  margin: 0;
  aspect-ratio: 7 / 5;
  overflow: hidden;
  background: var(--coal);
  clip-path: polygon(0 0, 100% 0, 100% 82%, 84% 100%, 0 100%);
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.85) contrast(1.06) brightness(.9);
}

/* 章节骨架 */
.page-about .about-sec {
  padding: clamp(34px, 5.5vw, 74px) 0;
  border-top: 2px solid var(--line);
}
.page-about .about-sec__head {
  display: grid;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 36px);
}
.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--paper);
}

/* 起点 */
.page-about .about-origin__lead {
  margin: 0 0 22px;
  padding-left: 14px;
  border-left: 3px solid var(--lime);
  max-width: 62ch;
  font-size: clamp(16.5px, 2vw, 21px);
  line-height: 1.62;
  color: var(--paper);
}
.page-about .about-origin__cols {
  display: grid;
  gap: 16px;
  max-width: 74ch;
  color: var(--silver);
  font-size: 15.5px;
  line-height: 1.82;
}
.page-about .about-origin__cols p {
  margin: 0;
}

/* 四条线 */
.page-about .about-lines {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-lines__item {
  position: relative;
  display: grid;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-lines__item:first-child {
  border-top: 2px solid var(--line);
}
.page-about .about-lines__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 0;
  height: 2px;
  background: var(--lime);
  transition: width var(--dur) var(--ease);
}
.page-about .about-lines__item:hover::before,
.page-about .about-lines__item:focus-within::before {
  width: 72px;
}
.page-about .about-lines__no {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--amber);
}
.page-about .about-lines__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.1vw, 22px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--paper);
}
.page-about .about-lines__body p {
  margin: 0;
  max-width: 62ch;
  color: var(--silver);
  font-size: 15px;
  line-height: 1.8;
}
.page-about .about-lines__go {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}
.page-about .about-lines__go:hover,
.page-about .about-lines__go:focus-visible {
  color: var(--lime);
}

/* 团队 */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(24px, 3.5vw, 40px);
}
.page-about .about-team__aside {
  display: grid;
  gap: 20px;
  align-content: start;
}
.page-about .about-folder {
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 24px 18px 14px;
}
.page-about .about-folder__tab {
  position: absolute;
  top: -12px;
  left: 14px;
  background: var(--amber);
  color: var(--coal);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  padding: 3px 10px;
}
.page-about .about-folder__list {
  margin: 0;
  display: grid;
}
.page-about .about-folder__list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-folder__list > div:last-child {
  border-bottom: 0;
}
.page-about .about-folder__list dt {
  margin: 0;
  font-size: 13px;
  color: var(--silver);
}
.page-about .about-folder__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}
.page-about .about-team__figure {
  margin: 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: var(--coal);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 10% 100%, 0 86%);
}
.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.8) brightness(.92);
}
.page-about .about-sec__head--stack {
  max-width: 56ch;
}
.page-about .about-team__intro {
  margin: 6px 0 0;
  color: var(--silver);
  font-size: 15px;
  line-height: 1.8;
}
.page-about .about-team__cards {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 3vw, 28px);
}
.page-about .about-team__card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 18px 18px 16px;
}
.page-about .about-team__card::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--lime);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.page-about .about-team__card:hover::after,
.page-about .about-team__card:focus-within::after {
  transform: scaleX(1);
}
.page-about .about-team__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--amber);
  margin-bottom: 8px;
}
.page-about .about-team__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--paper);
}
.page-about .about-team__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver);
}
.page-about .about-team__tag {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--teal);
  opacity: .5;
  transform: translateY(3px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-team__card:hover .about-team__tag,
.page-about .about-team__card:focus-within .about-team__tag {
  opacity: 1;
  transform: none;
}

/* 阶段 */
.page-about .about-stages-layout {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}
.page-about .about-stages {
  display: grid;
}
.page-about .about-stage {
  border-bottom: 1px solid var(--line);
}
.page-about .about-stage:first-child {
  border-top: 1px solid var(--line);
}
.page-about .about-stage summary {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 10px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}
.page-about .about-stage summary::-webkit-details-marker {
  display: none;
}
.page-about .about-stage__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
}
.page-about .about-stage__name {
  font-family: var(--font-display);
  font-size: clamp(16px, 2vw, 21px);
  font-weight: 800;
  color: var(--paper);
}
.page-about .about-stage__plus {
  position: relative;
  justify-self: end;
  width: 14px;
  height: 14px;
}
.page-about .about-stage__plus::before,
.page-about .about-stage__plus::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  background: var(--lime);
}
.page-about .about-stage__plus::before {
  width: 14px;
  height: 2px;
}
.page-about .about-stage__plus::after {
  width: 2px;
  height: 14px;
  transition: transform var(--dur) var(--ease);
}
.page-about .about-stage[open] .about-stage__plus::after {
  transform: scaleY(0);
}
.page-about .about-stage__text {
  margin: 0 0 20px;
  padding-left: 0;
  max-width: 60ch;
  color: var(--silver);
  font-size: 15px;
  line-height: 1.8;
}
.page-about .about-stages__aside {
  border-top: 2px solid var(--lime);
  padding-top: 14px;
}
.page-about .about-stages__note {
  margin: 0 0 16px;
  color: var(--silver);
  font-size: 14.5px;
  line-height: 1.78;
}
.page-about .about-stages__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}
.page-about .about-stages__list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--silver);
}
.page-about .about-stages__list li:last-child {
  border-bottom: 0;
}
.page-about .about-stages__list strong {
  font-family: var(--font-mono);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}

/* 协作 */
.page-about .about-partners {
  display: grid;
  gap: 16px;
}
.page-about .about-partners__stat {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 20px;
  border: 1px solid var(--line);
  background:
    linear-gradient(158deg, rgba(200, 255, 61, .10), transparent 58%),
    var(--panel);
}
.page-about .about-partners__stat strong {
  font-family: var(--font-cond);
  font-size: clamp(42px, 6vw, 64px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--lime);
}
.page-about .about-partners__stat span {
  color: var(--silver);
  font-size: 14px;
  line-height: 1.65;
}
.page-about .about-partners__text {
  margin: 0;
  color: var(--silver);
  font-size: 15px;
  line-height: 1.82;
  max-width: 72ch;
}
.page-about .about-cta {
  margin-top: clamp(20px, 3vw, 30px);
  padding: 18px 20px;
  border-left: 3px solid var(--orange);
  background: var(--panel);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.page-about .about-cta p {
  margin: 0;
  color: var(--paper);
  font-size: 15px;
  line-height: 1.7;
}

/* 地域收束 */
.page-about .about-end {
  border-top: 2px solid var(--line);
  padding: clamp(34px, 5.5vw, 76px) 0 clamp(40px, 6vw, 84px);
}
.page-about .about-end__grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}
.page-about .about-end__media {
  margin: 0;
  aspect-ratio: 10 / 7;
  overflow: hidden;
  background: var(--coal);
  clip-path: polygon(0 0, 100% 0, 100% 92%, 90% 100%, 0 100%);
}
.page-about .about-end__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.78) brightness(.88);
}
.page-about .about-end__title {
  margin: 8px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 36px);
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .about-end__copy p {
  margin: 0 0 14px;
  max-width: 58ch;
  color: var(--silver);
  font-size: 15.5px;
  line-height: 1.82;
}
.page-about .about-end__link {
  display: inline-block;
  margin-top: 4px;
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 3px;
}
.page-about .about-end__link:hover,
.page-about .about-end__link:focus-visible {
  color: var(--lime);
}

/* 桌面端 */
@media (min-width: 641px) {
  .page-about .about-stage summary {
    grid-template-columns: 88px minmax(0, 1fr) 24px;
    gap: 14px;
  }
  .page-about .about-stage__text {
    padding-left: 102px;
  }
}

@media (min-width: 760px) {
  .page-about .about-origin__cols {
    grid-template-columns: 1fr 1fr;
    gap: 26px;
  }
  .page-about .about-partners {
    grid-template-columns: 1fr 1fr;
    gap: 18px 22px;
  }
  .page-about .about-partners__text {
    grid-column: 1 / -1;
  }
  .page-about .about-team__cards {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
  .page-about .about-hero__main {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 26px;
    align-items: stretch;
  }
  .page-about .about-hero__rail {
    writing-mode: vertical-rl;
    padding-left: 0;
    padding-top: 10px;
    border-left: 0;
    border-top: 2px solid var(--lime);
    max-height: 340px;
    justify-self: start;
  }
  .page-about .about-sec__head {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    align-items: baseline;
    gap: 0 24px;
  }
  .page-about .about-sec__head--stack {
    display: block;
  }
  .page-about .about-sec__head--stack .kicker {
    display: block;
    margin-bottom: 8px;
  }
  .page-about .about-origin {
    padding-left: calc(25% + 12px);
  }
  .page-about .about-lines__item {
    grid-template-columns: 76px minmax(0, 1fr) 180px;
    align-items: start;
    gap: 22px;
    padding: 26px 0;
  }
  .page-about .about-lines__go {
    justify-self: end;
    margin-top: 4px;
  }
  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }
  .page-about .about-team__aside {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }
  .page-about .about-stages-layout {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }
  .page-about .about-stages__aside {
    border-top: 0;
    border-left: 2px solid var(--lime);
    padding: 0 0 0 18px;
  }
  .page-about .about-end__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }
}

@media (min-width: 1120px) {
  .page-about .about-team__cards {
    gap: 16px;
  }
  .page-about .about-hero__title {
    letter-spacing: -.028em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-lines__item::before,
  .page-about .about-team__card::after,
  .page-about .about-team__tag,
  .page-about .about-stage__plus::after {
    transition: none;
  }
  .page-about .about-team__tag {
    transform: none;
  }
}