.page-about {
  --about-line: var(--line-ink);
  --about-line-dark: rgba(245, 241, 232, .14);
  display: block;
}

.page-about [id] {
  scroll-margin-top: calc(var(--head-h) + 1.5rem);
}

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

/* ---------- 首屏框景 ---------- */

.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--sand);
  padding-top: calc(var(--head-h) + clamp(1.25rem, 3vw, 2.25rem));
  padding-bottom: clamp(2.25rem, 6vw, 4rem);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(110% 75% at 88% 4%, rgba(46, 211, 183, .12), transparent 62%),
    radial-gradient(85% 70% at 4% 100%, rgba(217, 68, 122, .12), transparent 66%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(.9rem, 2vw, 1.35rem);
}

.page-about .about-hero__frame {
  position: relative;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
  padding: clamp(1.25rem, 3.5vw, 2.5rem);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 5.4vw, 3.35rem);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--sand);
  margin: .7rem 0 1rem;
  max-width: 18ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(.98rem, 1.6vw, 1.11rem);
  line-height: 1.85;
  color: rgba(245, 241, 232, .78);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}

.page-about .about-hero__aside {
  display: grid;
  align-content: start;
  gap: 1rem;
  border-top: 1px solid var(--about-line-dark);
  padding-top: 1.25rem;
}

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

.page-about .about-marks__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: .6rem 0;
  border-bottom: 1px dashed rgba(245, 241, 232, .16);
}

.page-about .about-marks__k {
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(245, 241, 232, .55);
}

.page-about .about-marks__v {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: .95rem;
  color: var(--gold);
  text-align: right;
}

.page-about .about-marks__note {
  margin: 0;
  font-size: .78rem;
  line-height: 1.7;
  color: rgba(245, 241, 232, .5);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(15rem, .8fr);
    align-items: start;
  }

  .page-about .about-hero__aside {
    border-top: 0;
    border-left: 1px solid var(--about-line-dark);
    padding-top: 0;
    padding-left: clamp(1rem, 2.5vw, 1.9rem);
  }
}

/* ---------- 分区基础 ---------- */

.page-about .about-scope,
.page-about .about-crew,
.page-about .about-timeline,
.page-about .about-loop,
.page-about .about-materials {
  position: relative;
  padding-block: clamp(3rem, 7vw, 5.5rem);
}

.page-about .band--sand {
  background: var(--sand);
  color: var(--graphite);
}

.page-about .band--ink2 {
  background: var(--ink-2);
  color: var(--sand);
}

.page-about .band--indigo {
  background: var(--indigo);
  color: var(--sand);
}

.page-about .band--wine {
  background: var(--wine);
  color: var(--sand);
}

.page-about .band--sand .prose {
  color: rgba(27, 35, 46, .82);
}

.page-about .band--indigo .prose,
.page-about .band--ink2 .prose,
.page-about .band--wine .prose {
  color: rgba(245, 241, 232, .8);
}

.page-about .band--sand .section-head__title {
  color: var(--ink);
}

.page-about .band--indigo .section-head__title,
.page-about .band--ink2 .section-head__title,
.page-about .band--wine .section-head__title {
  color: var(--sand);
}

.page-about .about-scope .prose,
.page-about .about-loop .prose {
  margin: 0 0 1.15rem;
  font-size: 1rem;
  line-height: 1.85;
  max-width: 66ch;
}

/* ---------- 01 维护范围 ---------- */

.page-about .about-scope__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-scope__figure {
  margin: 1.85rem 0 0;
}

.page-about .about-facts {
  background: var(--ink);
  color: var(--sand);
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--sh-2);
  padding: 1.25rem 1.25rem 1.1rem;
}

.page-about .about-facts__title {
  margin: 0 0 .85rem;
  font-family: var(--font-num);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-facts__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-facts__row {
  display: grid;
  gap: .2rem;
  padding: .8rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-facts__k {
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(245, 241, 232, .55);
}

.page-about .about-facts__v {
  font-size: .95rem;
  color: rgba(245, 241, 232, .9);
}

.page-about .about-facts__v .num {
  font-size: 1.42rem;
  line-height: 1.3;
  color: var(--gold);
  letter-spacing: -.01em;
}

@media (min-width: 1000px) {
  .page-about .about-scope__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(15rem, .72fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .about-facts {
    position: sticky;
    top: calc(var(--head-h) + 1.75rem);
  }
}

/* ---------- 02 四个小组 ---------- */

.page-about .section-head--rule {
  padding-bottom: clamp(1rem, 2.5vw, 1.6rem);
}

.page-about .about-crew__list {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-crew__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .75rem;
  padding: clamp(1.25rem, 3vw, 1.9rem) clamp(.25rem, 1vw, .75rem);
  border-bottom: 1px solid var(--line);
  transition: background-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-crew__idx {
  font-size: .82rem;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .about-crew__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.2vw, 1.32rem);
  font-weight: 700;
  color: var(--sand);
}

.page-about .about-crew__role {
  margin: .35rem 0 0;
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .about-crew__desc {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: rgba(245, 241, 232, .74);
  max-width: 52ch;
}

.page-about .about-crew__deliverables {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

@media (hover: hover) {
  .page-about .about-crew__row:hover {
    background: rgba(245, 241, 232, .04);
  }

  .page-about .about-crew__row:hover .about-crew__idx {
    color: var(--magenta);
  }
}

@media (min-width: 860px) {
  .page-about .about-crew__row {
    grid-template-columns: 3rem minmax(0, 12.5rem) minmax(0, 1fr);
    gap: .5rem 1.5rem;
    align-items: start;
  }

  .page-about .about-crew__deliverables {
    grid-column: 2 / -1;
    margin-top: .35rem;
  }
}

@media (min-width: 1140px) {
  .page-about .about-crew__row {
    grid-template-columns: 3rem minmax(0, 12rem) minmax(0, 1fr) minmax(0, 13rem);
  }

  .page-about .about-crew__deliverables {
    grid-column: 4 / 5;
    margin-top: .15rem;
    flex-direction: column;
    align-items: flex-start;
    gap: .35rem;
  }
}

/* ---------- 03 时间轴 ---------- */

.page-about .about-timeline__figure {
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
}

.page-about .about-axis {
  list-style: none;
  margin: 0;
  padding: clamp(1.5rem, 4vw, 2.25rem) var(--gut) 1.25rem;
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-axis:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: -2px;
}

.page-about .about-axis::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-axis::-webkit-scrollbar-track {
  background: rgba(245, 241, 232, .1);
}

.page-about .about-axis::-webkit-scrollbar-thumb {
  background: var(--gold);
  border-radius: 99px;
}

.page-about .about-axis__node {
  position: relative;
  flex: 0 0 min(17rem, 74vw);
  scroll-snap-align: start;
  background: rgba(10, 26, 42, .48);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
  border-radius: var(--r);
  padding: 1.15rem 1.15rem 1.3rem;
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-axis__node::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 2.4rem;
  height: 2px;
  background: var(--magenta);
}

.page-about .about-axis__year {
  display: block;
  font-size: 1.65rem;
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--gold);
}

.page-about .about-axis__count {
  display: inline-block;
  margin-top: .4rem;
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-axis__node h3 {
  margin: .85rem 0 .45rem;
  font-family: var(--font-display);
  font-size: 1.03rem;
  font-weight: 700;
  color: var(--sand);
}

.page-about .about-axis__node p {
  margin: 0;
  font-size: .86rem;
  line-height: 1.78;
  color: rgba(245, 241, 232, .72);
}

@media (hover: hover) {
  .page-about .about-axis__node:hover {
    transform: translateY(-2px);
    border-color: rgba(213, 166, 64, .6);
  }
}

/* ---------- 04 反馈闭环 ---------- */

.page-about .about-loop__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-loop__steps {
  list-style: none;
  counter-reset: about-loop;
  margin: 1.6rem 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-loop__steps li {
  position: relative;
  counter-increment: about-loop;
  padding: 1.05rem 0 1.05rem 3.4rem;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-loop__steps li::before {
  content: counter(about-loop, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1.12rem;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: .82rem;
  letter-spacing: .08em;
  color: var(--jade);
}

.page-about .about-loop__steps strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.02rem;
  color: var(--ink);
  margin-bottom: .3rem;
}

.page-about .about-loop__steps span {
  display: block;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(27, 35, 46, .74);
  max-width: 52ch;
}

.page-about .about-loop__side {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-loop__metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .5rem;
}

.page-about .about-loop__metrics li {
  display: grid;
  gap: .15rem;
  background: var(--ink);
  border-left: 2px solid var(--jade);
  border-radius: var(--r);
  padding: .8rem 1rem;
}

.page-about .about-loop__metrics-num {
  font-size: 1.45rem;
  line-height: 1.25;
  color: var(--gold);
}

.page-about .about-loop__metrics-k {
  font-size: .78rem;
  line-height: 1.6;
  color: rgba(245, 241, 232, .68);
}

@media (min-width: 1000px) {
  .page-about .about-loop__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(17rem, .78fr);
    gap: clamp(2rem, 4vw, 3.25rem);
  }
}

/* ---------- 05 资料清单 ---------- */

.page-about .about-materials__list {
  list-style: none;
  margin: clamp(1.6rem, 3.5vw, 2.35rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-materials__item {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: .5rem 1rem;
  align-items: start;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-materials__num {
  font-size: .82rem;
  letter-spacing: .12em;
  color: var(--gold);
  padding-top: .2rem;
}

.page-about .about-materials__text h3 {
  margin: 0 0 .35rem;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--sand);
}

.page-about .about-materials__text p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(245, 241, 232, .74);
  max-width: 56ch;
}

.page-about .about-materials__item > .tag {
  grid-column: 2 / -1;
  justify-self: start;
}

.page-about .about-materials__foot {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--about-line-dark);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  align-items: center;
  justify-content: space-between;
}

.page-about .about-materials__foot p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: rgba(245, 241, 232, .72);
  max-width: 46ch;
}

.page-about .about-materials__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
}

@media (min-width: 760px) {
  .page-about .about-materials__item {
    grid-template-columns: 2.4rem minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-materials__item > .tag {
    grid-column: 3 / 4;
    justify-self: end;
  }
}

/* ---------- 下一站 ---------- */

.page-about .about-next {
  background: var(--ink);
  padding-block: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-next .next-stop {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .35rem 1rem;
  align-items: center;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  border-radius: var(--r);
  text-decoration: none;
  transition: background-color .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-next .next-stop:hover {
  background: rgba(245, 241, 232, .05);
  border-left-color: var(--cyan);
}

.page-about .about-next .next-stop__kicker {
  grid-column: 1 / -1;
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-next .next-stop__title {
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 2.2vw, 1.24rem);
  font-weight: 700;
  color: var(--sand);
}

.page-about .about-next .next-stop__arrow {
  font-family: var(--font-num);
  font-size: .9rem;
  color: var(--gold);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew__row,
  .page-about .about-axis__node,
  .page-about .about-next .next-stop {
    transition: none;
  }

  .page-about .about-axis__node:hover {
    transform: none;
  }
}