.page-about {
  --about-rail: 152px;
  --about-line: var(--paper-200);
  background: var(--warm-white);
  color: var(--charcoal);
}

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

.page-about .about-crumb {
  padding-top: clamp(14px, 2vw, 22px);
  padding-bottom: clamp(6px, 1vw, 12px);
  background: var(--warm-white);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(231, 225, 211, .55) 0%, rgba(247, 243, 234, 0) 64%),
    var(--warm-white);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(23, 24, 26, .05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(23, 24, 26, .05) 1px, transparent 1px);
  background-size: 88px 88px;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  padding-block: clamp(30px, 5vw, 64px) clamp(44px, 7vw, 96px);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--slate-500);
  margin: 0;
}

.page-about .about-hero__title {
  margin: .34em 0 0;
  font-size: clamp(34px, 6.6vw, 84px);
  line-height: 1.03;
  letter-spacing: -.02em;
  font-weight: 800;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--turf-600);
  display: inline-block;
  transform: skewX(-1.5deg);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-hero__side {
  border-top: 2px solid var(--charcoal);
  padding-top: 6px;
  display: grid;
}

.page-about .about-hero__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}

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

.page-about .about-hero__statNum {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--turf-900);
  white-space: nowrap;
}

.page-about .about-hero__statLabel {
  font-size: 12.5px;
  line-height: 1.4;
  letter-spacing: .04em;
  color: var(--slate-500);
  text-align: right;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(36px, 5vw, 80px);
  }
}

/* ---------- 时间线叙事 ---------- */

.page-about .about-story {
  background: var(--warm-white);
  padding-block: clamp(44px, 7vw, 100px);
}

.page-about .about-story__figure {
  margin: 0 0 clamp(34px, 5vw, 64px);
  overflow: hidden;
  border-radius: 2px;
  background: var(--paper-200);
}

.page-about .about-story__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 1600 / 700;
  object-fit: cover;
}

.page-about .about-story__head {
  max-width: 46em;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-story__title {
  margin: 0;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.15;
  letter-spacing: -.015em;
  font-weight: 800;
}

.page-about .about-story__lede {
  margin: 16px 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-timeline {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-rail {
  border-top: 2px solid var(--charcoal);
  padding-top: 12px;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .22em;
  color: var(--slate-500);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--slate-500);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
  opacity: .55;
  transition: width .26s var(--ease), background-color .2s var(--ease), opacity .2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--turf-900);
}

.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before {
  width: 30px;
  background: var(--red);
  opacity: 1;
}

.page-about .about-era {
  padding: clamp(22px, 3.2vw, 34px) 0;
  border-top: 1px solid var(--about-line);
  scroll-margin-top: 120px;
}

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

.page-about .about-era__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4.4vw, 50px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--turf-600);
}

.page-about .about-era__title {
  margin: 12px 0 0;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .about-era__text {
  margin: 10px 0 0;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ink-soft);
}

@media (min-width: 960px) {
  .page-about .about-timeline {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 128px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
  }
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: var(--indigo-900);
  color: var(--warm-white);
  padding-block: clamp(46px, 7vw, 100px);
}

.page-about .about-team__head {
  max-width: 44em;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-team__title {
  margin: 0;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.15;
  letter-spacing: -.015em;
  font-weight: 800;
  color: var(--warm-white);
}

.page-about .about-team__lede {
  margin: 16px 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.8;
  color: rgba(247, 243, 234, .76);
}

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

.page-about .about-team__card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 148px;
  padding: clamp(16px, 2.2vw, 22px);
  background: var(--glass-fill);
  border: 1px solid var(--glass-line);
  border-radius: 2px;
  transition: transform .28s var(--ease), background-color .28s var(--ease), border-color .28s var(--ease);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, .16);
  border-color: var(--turf-300);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 4vw, 44px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--turf-300);
}

.page-about .about-team__unit {
  font-size: .42em;
  font-weight: 400;
  letter-spacing: .06em;
  margin-left: 4px;
  color: rgba(247, 243, 234, .7);
}

.page-about .about-team__role {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--warm-white);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(247, 243, 234, .72);
}

@media (min-width: 620px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-team__card {
    min-height: 172px;
  }
}

/* ---------- 专题分期 ---------- */

.page-about .about-issues {
  position: relative;
  background: var(--warm-white);
  padding-block: clamp(46px, 7vw, 100px);
  overflow: hidden;
}

.page-about .about-issues::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--turf-600) 0%, var(--turf-600) 18%, var(--red) 18%, var(--red) 23%, var(--indigo-500) 23%, var(--indigo-500) 100%);
}

.page-about .about-issues__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-issues__title {
  margin: .5em 0 0;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.15;
  letter-spacing: -.015em;
  font-weight: 800;
}

.page-about .about-issues__text {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-issues__facts {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .about-issues__facts li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  padding: 12px 0;
  border-top: 1px solid var(--about-line);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-about .about-issues__facts li:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-issues__facts strong {
  flex: 0 0 auto;
  min-width: 5.6em;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--turf-900);
}

.page-about .about-issues__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-issues__figure {
  margin: 0;
  position: relative;
  background: var(--paper-200);
  overflow: hidden;
  border-radius: 2px;
  order: -1;
}

.page-about .about-issues__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-issues__figure::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 56px;
  height: 56px;
  border-right: 3px solid var(--red);
  border-bottom: 3px solid var(--red);
}

@media (min-width: 900px) {
  .page-about .about-issues__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-issues__figure {
    order: 0;
    transform: translateY(-16px);
  }
}

/* ---------- 生产流程 ---------- */

.page-about .about-flow {
  position: relative;
  background: var(--turf-900);
  color: var(--warm-white);
  padding-block: clamp(46px, 7vw, 100px);
  overflow: hidden;
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(247, 243, 234, .06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(247, 243, 234, .06) 1px, transparent 1px);
  background-size: 96px 96px;
  pointer-events: none;
}

.page-about .about-flow .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-flow__head {
  max-width: 42em;
}

.page-about .about-flow__title {
  margin: 0;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.15;
  letter-spacing: -.015em;
  font-weight: 800;
  color: var(--warm-white);
}

.page-about .about-flow__lede {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.8;
  color: rgba(247, 243, 234, .74);
}

.page-about .about-flow__figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
  max-width: 660px;
  background: rgba(255, 255, 255, .08);
  border: 1px solid var(--glass-line);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 1200 / 800;
  object-fit: cover;
}

.page-about .about-flow__track {
  position: relative;
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .about-flow__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: .6;
}

.page-about .about-flow__list {
  position: relative;
  display: grid;
  gap: 12px;
}

.page-about .about-flow__item {
  background: var(--glass-fill);
  border: 1px solid var(--glass-line);
  border-radius: 2px;
  padding: clamp(15px, 2vw, 20px);
  transition: border-color .24s var(--ease), background-color .24s var(--ease);
}

.page-about .about-flow__item[open] {
  border-color: var(--turf-300);
  background: rgba(255, 255, 255, .14);
}

.page-about .about-flow__sum {
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-flow__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--red);
}

.page-about .about-flow__item[open] .about-flow__sum::after {
  content: "\2013";
}

.page-about .about-flow__sum:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 5px;
}

.page-about .about-flow__step {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--turf-300);
}

.page-about .about-flow__name {
  font-size: clamp(16px, 1.8vw, 18px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--warm-white);
}

.page-about .about-flow__body {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(247, 243, 234, .8);
}

.page-about .about-flow__output {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px dashed rgba(134, 214, 172, .38);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  line-height: 1.7;
  color: var(--turf-300);
}

@media (min-width: 900px) {
  .page-about .about-flow__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }

  .page-about .about-flow__item:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .about-flow__item:nth-child(3) {
    margin-top: 68px;
  }
}

/* ---------- 合作生态 ---------- */

.page-about .about-partners {
  background: var(--warm-white);
  padding-block: clamp(46px, 7vw, 100px);
}

.page-about .about-partners__head {
  max-width: 44em;
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .about-partners__title {
  margin: 0;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.15;
  letter-spacing: -.015em;
  font-weight: 800;
}

.page-about .about-partners__lede {
  margin: 16px 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-partners__grid {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-partners__item {
  background: var(--warm-white);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-partners__idx {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--red);
}

.page-about .about-partners__name {
  margin: 12px 0 0;
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .about-partners__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-partners__foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate-500);
}

.page-about .about-partners__foot a {
  color: var(--turf-600);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-partners__foot a:hover {
  color: var(--red);
}

@media (min-width: 760px) {
  .page-about .about-partners__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 继续读 ---------- */

.page-about .about-next {
  background: var(--warm-white);
  padding-block: clamp(10px, 2vw, 20px) clamp(48px, 7vw, 96px);
}

.page-about .about-next__title {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .about-next__grid {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-next__item {
  position: relative;
  display: grid;
  gap: 8px;
  padding: clamp(20px, 3vw, 28px);
  background: var(--warm-white);
  color: var(--charcoal);
  text-decoration: none;
  transition: background-color .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  background: #FFFFFF;
  box-shadow: inset 3px 0 0 var(--red);
}

.page-about .about-next__kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--indigo-500);
}

.page-about .about-next__label {
  font-size: 15.5px;
  line-height: 1.65;
  font-weight: 600;
}

.page-about .about-next__arrow {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--slate-500);
  transition: transform .24s var(--ease), color .24s var(--ease);
}

.page-about .about-next__item:hover .about-next__arrow {
  transform: translateX(6px);
  color: var(--red);
}

@media (min-width: 760px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__title em {
    transform: none;
  }

  .page-about .about-team__card,
  .page-about .about-next__item,
  .page-about .about-next__arrow,
  .page-about .about-rail__link::before {
    transition: none;
  }

  .page-about .about-team__card:hover,
  .page-about .about-team__card:focus-within {
    transform: none;
  }
}