.page-about {
  overflow-x: hidden;
}

.page-about .about-hero {
  position: relative;
  padding: calc(var(--unit) * 5) 0 calc(var(--unit) * 6);
  border-bottom: 1px solid var(--steel);
  background:
    radial-gradient(120% 80% at 82% 0%, rgba(47, 227, 208, 0.1), transparent 62%),
    var(--deep);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(34, 48, 63, 0.6) 0 1px, transparent 1px 104px),
    repeating-linear-gradient(0deg, rgba(34, 48, 63, 0.4) 0 1px, transparent 1px 104px);
  pointer-events: none;
}

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

.page-about .about-hero__title {
  margin: calc(var(--unit) * 2) 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8.4vw, 78px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .about-hero__line {
  display: block;
}

.page-about .about-hero__line--hl {
  color: var(--cyan);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: calc(var(--unit) * 3) 0 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ash);
}

.page-about .about-hero__strip {
  margin-top: calc(var(--unit) * 5);
  padding-top: calc(var(--unit) * 3);
  border-top: 1px solid var(--steel);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: calc(var(--unit) * 3);
}

.page-about .about-hero__strip .data-strip__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-hero__strip .data-strip__value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(21px, 4.6vw, 32px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-hero__unit {
  font-size: 0.6em;
  margin-left: 2px;
}

.page-about .about-hero__stat-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ash);
}

.page-about .about-archive {
  padding-top: calc(var(--unit) * 2);
  padding-bottom: calc(var(--unit) * 6);
}

.page-about .about-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--unit) * 2);
  padding: calc(var(--unit) * 5) 0;
  border-top: 1px solid var(--steel);
}

.page-about .about-section:first-child {
  border-top: 0;
}

.page-about .about-section__rail {
  display: none;
}

.page-about .about-kicker {
  margin: 0 0 calc(var(--unit) * 1.5);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-section__title {
  margin: 0 0 calc(var(--unit) * 2);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 5vw, 44px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--fog);
}

.page-about .about-section__lede {
  max-width: 66ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ash);
}

.page-about .about-prose {
  margin-top: calc(var(--unit) * 3);
}

.page-about .about-prose p {
  margin: 0 0 1.15em;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ash);
}

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

.page-about .about-figure {
  margin: calc(var(--unit) * 4) 0 0;
}

.page-about .about-figure .figure__frame,
.page-about .about-team-figure .figure__frame {
  position: relative;
  border: 1px solid var(--steel);
  background: var(--night);
  overflow: hidden;
}

.page-about .about-figure img,
.page-about .about-team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.08);
}

.page-about .about-figure .figure__caption,
.page-about .about-team-figure .figure__caption {
  margin-top: calc(var(--unit) * 1.5);
  font-size: 13px;
  line-height: 1.6;
  color: var(--smoke);
}

/* 主张拆解 */
.page-about .mean {
  margin-top: calc(var(--unit) * 4);
  border-top: 1px solid var(--steel);
  border-bottom: 1px solid var(--steel);
  display: grid;
  gap: 0;
}

.page-about .mean__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--unit) * 1.5);
  padding: calc(var(--unit) * 3.5) 0;
  border-bottom: 1px solid rgba(34, 48, 63, 0.7);
}

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

.page-about .mean__index {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--orange);
}

.page-about .mean__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.8vw, 29px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .mean__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ash);
}

.page-about .mean__note {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

/* 时间线 */
.page-about .tl {
  position: relative;
  margin-top: calc(var(--unit) * 4);
  padding-left: 22px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--steel) 42%, rgba(34, 48, 63, 0) 100%);
}

.page-about .tl__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.1;
  pointer-events: none;
  z-index: 0;
}

.page-about .tl__item {
  position: relative;
  z-index: 1;
  padding-bottom: calc(var(--unit) * 4.5);
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--deep);
  border: 1px solid var(--cyan);
}

.page-about .tl__year {
  margin: 0 0 calc(var(--unit) * 1);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .tl__title {
  margin: 0 0 calc(var(--unit) * 1);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.6vw, 22px);
  line-height: 1.35;
  color: var(--fog);
}

.page-about .tl__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ash);
}

.page-about .tl__fold {
  margin-top: calc(var(--unit) * 1.5);
  max-width: 62ch;
}

.page-about .tl__fold summary {
  display: inline-block;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--orange);
  cursor: pointer;
  border-bottom: 1px solid rgba(255, 106, 43, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl__fold summary::marker {
  color: var(--orange);
}

.page-about .tl__fold summary:hover,
.page-about .tl__fold summary:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .tl__fold p {
  margin: calc(var(--unit) * 1.5) 0 0;
  padding-left: calc(var(--unit) * 2);
  border-left: 3px solid var(--cyan);
  font-size: 15px;
  line-height: 1.78;
  color: var(--ash);
}

/* 团队 */
.page-about .team-layout {
  margin-top: calc(var(--unit) * 4);
  display: grid;
  gap: calc(var(--unit) * 3);
}

.page-about .quad {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .quad__cell {
  position: relative;
  padding: calc(var(--unit) * 3);
  background: var(--night);
  transition: background var(--dur) var(--ease);
}

.page-about .quad__cell::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 0;
  background: var(--cyan);
  transition: height var(--scan) var(--ease);
}

.page-about .quad__cell:hover,
.page-about .quad__cell:focus-within {
  background: var(--card);
}

.page-about .quad__cell:hover::after,
.page-about .quad__cell:focus-within::after {
  height: 100%;
}

.page-about .quad__num {
  margin: 0 0 calc(var(--unit) * 1);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--smoke);
}

.page-about .quad__title {
  margin: 0 0 calc(var(--unit) * 1);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--fog);
}

.page-about .quad__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ash);
}

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

.page-about .about-chain {
  margin: calc(var(--unit) * 3) 0 0;
  padding: calc(var(--unit) * 2.5) calc(var(--unit) * 3);
  border-left: 3px solid var(--orange);
  background: var(--card);
  font-size: 15px;
  line-height: 1.78;
  color: var(--ash);
}

/* 数据条目 */
.page-about .clauses {
  margin-top: calc(var(--unit) * 4);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .clause {
  padding: calc(var(--unit) * 3);
  background: var(--deep);
  transition: background var(--dur) var(--ease);
}

.page-about .clause:hover {
  background: var(--card);
}

.page-about .clause__num {
  margin: 0 0 calc(var(--unit) * 1);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .clause__title {
  margin: 0 0 calc(var(--unit) * 0.8);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .clause__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ash);
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 208, 0.45);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* 成果 */
.page-about .results {
  margin-top: calc(var(--unit) * 4);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .results__item {
  padding: calc(var(--unit) * 3);
  background: var(--night);
}

.page-about .results__value {
  display: block;
  margin-bottom: calc(var(--unit) * 1);
  font-size: clamp(26px, 5vw, 36px);
  font-weight: 500;
  line-height: 1;
  color: var(--cyan);
}

.page-about .results__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ash);
}

/* 入口链接 */
.page-about .about-links {
  margin-top: calc(var(--unit) * 4);
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--unit) * 1.5);
}

.page-about .about-links__item {
  position: relative;
  display: grid;
  gap: 6px;
  padding: calc(var(--unit) * 2.5) calc(var(--unit) * 3);
  border: 1px solid var(--steel);
  background: var(--deep);
  text-decoration: none;
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-links__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--scan) var(--ease);
}

.page-about .about-links__item:hover,
.page-about .about-links__item:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .about-links__item:hover::before,
.page-about .about-links__item:focus-visible::before {
  transform: scaleY(1);
}

.page-about .about-links__label {
  font-size: 11.5px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-links__text {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--fog);
}

.page-about .about-outro {
  margin: calc(var(--unit) * 4) 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ash);
}

@media (min-width: 560px) {
  .page-about .quad {
    grid-template-columns: 1fr 1fr;
  }

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

@media (min-width: 760px) {
  .page-about .about-hero__strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .clause--wide {
    grid-column: 1 / -1;
  }

  .page-about .about-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: calc(var(--unit) * 7) 0 calc(var(--unit) * 8);
  }

  .page-about .about-section {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: calc(var(--unit) * 5);
    padding: calc(var(--unit) * 8) 0;
  }

  .page-about .about-section__rail {
    display: block;
    position: relative;
  }

  .page-about .about-section__rail-text {
    position: sticky;
    top: 112px;
    display: block;
    padding-bottom: calc(var(--unit) * 2);
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.44em;
    text-transform: uppercase;
    color: var(--smoke);
  }

  .page-about .about-section__rail-text::after {
    content: "";
    display: block;
    width: 1px;
    height: 72px;
    margin-top: calc(var(--unit) * 2);
    background: linear-gradient(180deg, var(--cyan), rgba(47, 227, 208, 0));
  }

  .page-about .about-kicker {
    display: none;
  }

  .page-about .mean__item {
    grid-template-columns: 48px minmax(0, 0.85fr) minmax(0, 1.4fr) minmax(0, 0.7fr);
    align-items: start;
    gap: calc(var(--unit) * 3);
  }

  .page-about .mean__index {
    padding-top: 6px;
  }

  .page-about .mean__note {
    padding-top: 8px;
    text-align: right;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.8fr);
    align-items: start;
    gap: calc(var(--unit) * 4);
  }
}

@media (min-width: 1180px) {
  .page-about .about-section {
    grid-template-columns: 88px minmax(0, 1fr);
  }

  .page-about .about-section__title {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .quad__cell,
  .page-about .quad__cell::after,
  .page-about .about-links__item,
  .page-about .about-links__item::before,
  .page-about .tl__fold summary {
    transition: none;
  }

  .page-about .about-links__item:hover,
  .page-about .about-links__item:focus-visible {
    transform: none;
  }
}