.page-about {
  --about-hair: rgba(38, 51, 73, .62);
  --about-soft: rgba(38, 51, 73, .34);
  color: var(--c-mist);
}

/* 面包屑 */
.page-about .about-crumb {
  width: var(--shell);
  margin: 0 auto;
  padding: 1.75rem 0 0;
}
.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .08em;
}
.page-about .about-crumb li {
  display: flex;
  align-items: center;
  gap: .5rem;
}
.page-about .about-crumb li + li::before {
  content: "/";
  color: var(--about-soft);
}
.page-about .about-crumb a {
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}
.page-about .about-crumb [aria-current="page"] {
  color: var(--c-amber);
}

/* 首屏 */
.page-about .about-hero {
  width: var(--shell);
  margin: 0 auto;
  padding: 2.25rem 0 0;
  display: grid;
  gap: 2rem;
}
.page-about .about-hero__text {
  display: flex;
  flex-direction: column;
  gap: .9rem;
}
.page-about .about-hero__text h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-style: italic;
  font-size: clamp(2rem, 4.4vw, 3.35rem);
  line-height: 1.22;
  color: var(--c-cream);
  letter-spacing: .01em;
  max-width: 17ch;
}
.page-about .about-hero__text .lede {
  margin: 0;
  color: var(--c-mist);
  font-size: 1.0625rem;
  line-height: 1.8;
  max-width: 48ch;
}
.page-about .about-hero__body {
  margin: 0;
  color: var(--c-mist);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 52ch;
  padding-left: 1rem;
  border-left: 2px solid var(--c-cyan-deep);
}
.page-about .about-hero__media {
  position: relative;
  margin: 0;
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: saturate(.72) contrast(1.05);
}
.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(11, 16, 24, 0) 42%, rgba(11, 16, 24, .78) 100%),
    repeating-linear-gradient(90deg, rgba(37, 224, 212, .14) 0 1px, transparent 1px 46px);
}
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3.5rem;
    align-items: end;
    padding-top: 3rem;
  }
  .page-about .about-hero__media {
    transform: rotate(-1.2deg);
  }
}

/* 速览数字条 */
.page-about .about-figures {
  width: var(--shell);
  margin: 3rem auto 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-soft);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}
.page-about .about-figure {
  background: var(--c-ink);
  padding: 1.35rem 1rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .45rem;
}
.page-about .about-figure__num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.75rem, 4.4vw, 2.6rem);
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: -.02em;
}
.page-about .about-figure__label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-mist);
}
@media (min-width: 760px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-figure {
    padding: 1.75rem 1.5rem 2rem;
  }
}

/* 通用栏目 */
.page-about .about-section {
  width: var(--shell);
  margin: 0 auto;
  padding: 4rem 0 0;
}
@media (min-width: 900px) {
  .page-about .about-section {
    padding-top: 6.5rem;
  }
}
.page-about .about-head {
  border-top: 1px solid var(--about-hair);
  padding-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .85rem;
}
.page-about .about-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.4vw, 2.45rem);
  line-height: 1.3;
  color: var(--c-cream);
  max-width: 24ch;
}
.page-about .about-lede {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-mist);
  max-width: 56ch;
}

/* 时间轴 */
.page-about .about-timeline {
  margin-top: 2.75rem;
  padding-left: 1.75rem;
  border-left: 1px solid var(--about-hair);
  display: flex;
  flex-direction: column;
}
.page-about .about-tl-item {
  position: relative;
  border-bottom: 1px solid var(--about-soft);
  padding-bottom: 1.25rem;
}
.page-about .about-tl-item + .about-tl-item {
  padding-top: 1.5rem;
}
.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 1.85rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-cyan);
  transform: translateX(-50%);
  box-shadow: 0 0 0 4px var(--c-ink);
}
.page-about .about-tl-item:first-child::before {
  background: var(--c-amber);
  top: 1.6rem;
}
.page-about .about-tl-item > summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  display: grid;
  gap: .4rem;
  padding-right: 2rem;
}
.page-about .about-tl-item > summary::-webkit-details-marker {
  display: none;
}
.page-about .about-tl-item > summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: .1rem;
  font-family: var(--font-data);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--c-cyan);
}
.page-about .about-tl-item[open] > summary::after {
  content: "–";
  color: var(--c-amber);
}
.page-about .about-tl-item > summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 4px;
}
.page-about .about-tl-index {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-amber);
}
.page-about .about-tl-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  line-height: 1.45;
  color: var(--c-cream);
}
.page-about .about-tl-body {
  padding-top: .85rem;
}
.page-about .about-tl-body p {
  margin: 0 0 .75rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-mist);
  max-width: 60ch;
}
.page-about .about-tl-points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .4rem;
}
.page-about .about-tl-points li {
  position: relative;
  padding-left: 1.1rem;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--c-mist);
}
.page-about .about-tl-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 1px;
  background: var(--c-cyan-deep);
}
.page-about .about-tl-figure {
  margin: 1.75rem 0 1.5rem;
  position: relative;
}
.page-about .about-tl-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(.68) contrast(1.06) grayscale(.1);
}
.page-about .about-tl-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(11, 16, 24, .15), rgba(11, 16, 24, .55)),
    repeating-linear-gradient(0deg, rgba(37, 224, 212, .12) 0 1px, transparent 1px 32px);
}
@media (min-width: 860px) {
  .page-about .about-timeline {
    padding-left: 9rem;
  }
  .page-about .about-tl-item::before {
    left: -9rem;
  }
  .page-about .about-tl-item + .about-tl-item {
    padding-top: 2rem;
  }
  .page-about .about-tl-item > summary {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }
  .page-about .about-tl-title {
    grid-column: 2;
  }
  .page-about .about-tl-item > summary::after {
    top: .4rem;
  }
  .page-about .about-tl-body {
    padding-left: 10rem;
    padding-top: 1.1rem;
  }
  .page-about .about-tl-figure {
    width: 82%;
    margin: 2.25rem 0 2rem auto;
  }
}

/* 团队 */
.page-about .about-teams {
  margin-top: 2.5rem;
  border-top: 1px solid var(--about-hair);
}
.page-about .about-team {
  display: grid;
  gap: .5rem;
  padding: 1.5rem 0 1.75rem;
  border-bottom: 1px solid var(--about-soft);
}
.page-about .about-team__idx {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-cyan-deep);
}
.page-about .about-team__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.4;
  color: var(--c-cream);
}
.page-about .about-team__text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-mist);
  max-width: 56ch;
}
@media (min-width: 820px) {
  .page-about .about-team {
    grid-template-columns: 3.5rem minmax(0, 13rem) minmax(0, 1fr);
    gap: 1.75rem;
    align-items: baseline;
    padding: 1.85rem 0 2rem;
  }
}

/* 数据链路 */
.page-about .about-data {
  margin-top: 2.5rem;
  display: grid;
  gap: 2.5rem;
}
.page-about .about-data__main {
  display: flex;
  flex-direction: column;
}
.page-about .about-step {
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--about-soft);
}
.page-about .about-step:first-child {
  border-top: 1px solid var(--about-hair);
}
.page-about .about-step__num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 1.25rem;
  line-height: 1.3;
  color: var(--c-amber);
}
.page-about .about-step__name {
  margin: 0 0 .4rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.4;
  color: var(--c-cream);
}
.page-about .about-step p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-mist);
  max-width: 60ch;
}
.page-about .about-data__aside {
  align-self: start;
  padding: 1.75rem 1.5rem;
}
.page-about .about-aside__label {
  margin: 0 0 .35rem;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-mist);
}
.page-about .about-aside__value {
  margin: 0 0 .5rem;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: -.03em;
}
.page-about .about-aside__value span {
  font-size: .32em;
  margin-left: .35em;
  color: var(--c-mist);
  letter-spacing: .08em;
}
.page-about .about-aside__note {
  margin: 0 0 1.25rem;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--c-mist);
}
.page-about .about-data__aside .rule {
  margin: 0 0 1.25rem;
  border: 0;
  border-top: 1px solid var(--about-soft);
}
@media (min-width: 900px) {
  .page-about .about-data {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3.5rem;
  }
  .page-about .about-step {
    grid-template-columns: 3.25rem minmax(0, 1fr);
    gap: 1.5rem;
    padding: 1.6rem 0;
  }
}

/* 区域服务：奶油反白块 */
.page-about .about-region {
  margin-top: 4rem;
  background: var(--c-cream);
  color: var(--c-ink);
  padding: 3rem 0;
}
.page-about .about-region__inner {
  width: var(--shell);
  margin: 0 auto;
  display: grid;
  gap: 2.25rem;
}
.page-about .about-region__text {
  display: flex;
  flex-direction: column;
  gap: .9rem;
}
.page-about .about-kicker--dark {
  color: var(--c-amber-deep);
}
.page-about .about-kicker--dark::before {
  background: var(--c-amber-deep);
}
.page-about .about-region__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.4vw, 2.35rem);
  line-height: 1.3;
  color: var(--c-ink);
  max-width: 20ch;
}
.page-about .about-region__text p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: #2b3446;
  max-width: 56ch;
}
.page-about .about-region__facts {
  margin: .75rem 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(11, 16, 24, .16);
  border-top: 1px solid rgba(11, 16, 24, .16);
  border-bottom: 1px solid rgba(11, 16, 24, .16);
}
.page-about .about-region__facts > div {
  background: var(--c-cream);
  padding: .9rem .85rem 1rem;
}
.page-about .about-region__facts dt {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .1em;
  color: #6b7488;
  margin-bottom: .35rem;
}
.page-about .about-region__facts dd {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.5;
  color: var(--c-ink);
  word-break: break-word;
}
.page-about .about-region__media {
  margin: 0;
  position: relative;
}
.page-about .about-region__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.7) contrast(1.04);
}
.page-about .about-region__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(200deg, rgba(255, 155, 47, .18), rgba(11, 16, 24, .42)),
    repeating-linear-gradient(90deg, rgba(37, 224, 212, .12) 0 1px, transparent 1px 38px);
}
@media (min-width: 900px) {
  .page-about .about-region {
    margin-top: 6.5rem;
    padding: 4.5rem 0;
  }
  .page-about .about-region__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 3.5rem;
    align-items: center;
  }
  .page-about .about-region__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-width: 34rem;
  }
}

/* 协作与考核 */
.page-about .about-eco {
  margin-top: 2.5rem;
  display: grid;
  gap: 1.75rem;
}
.page-about .about-eco__block {
  padding: 1.5rem 0 0;
  border-top: 2px solid var(--c-cyan-deep);
}
.page-about .about-eco__block:nth-child(2) {
  border-top-color: var(--c-amber);
}
.page-about .about-eco__block h3 {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.4;
  color: var(--c-cream);
}
.page-about .about-eco__block p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-mist);
  max-width: 54ch;
}
.page-about .about-eco__block--paper {
  padding: 1.5rem 1.35rem 1.6rem;
  border-top-color: var(--c-amber-deep);
}
.page-about .about-eco__block--paper h3 {
  color: var(--c-ink);
}
.page-about .about-eco__block--paper p {
  color: #2b3446;
}
.page-about .about-inline-link {
  display: inline-block;
  margin-top: .9rem;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-amber-deep);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}
.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--c-ink);
}
@media (min-width: 860px) {
  .page-about .about-eco {
    grid-template-columns: minmax(0, 4fr) minmax(0, 4fr) minmax(0, 4fr);
    gap: 2rem;
    align-items: start;
  }
  .page-about .about-eco__block--paper {
    transform: rotate(-1deg);
  }
}

/* 尾部入口 */
.page-about .about-next {
  width: var(--shell);
  margin: 4rem auto 0;
  padding: 2.5rem 0 4.5rem;
  border-top: 1px solid var(--about-hair);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  line-height: 1.35;
  color: var(--c-cream);
}
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: .85rem;
}
@media (min-width: 900px) {
  .page-about .about-next {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__media,
  .page-about .about-eco__block--paper {
    transform: none;
  }
}