.page-about {
  --about-card: #FCFBF7;
  --about-grid-line: rgba(207, 231, 227, .09);
  padding-bottom: clamp(40px, 6vw, 80px);
  color: var(--graphite);
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 32px);
  margin-bottom: clamp(20px, 3.4vw, 38px);
  font-size: 13px;
}

.page-about .about-crumb .crumb a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-crumb .crumb a:hover,
.page-about .about-crumb .crumb a:focus-visible {
  color: var(--spark);
  border-bottom-color: var(--spark);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  padding-bottom: clamp(34px, 5vw, 62px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 60px);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--ink);
  margin: .3em 0 .5em;
}

.page-about .about-hero .lede {
  max-width: 58ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--graphite);
  margin: 0;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

.page-about .about-hero__fig {
  margin: 0;
}

.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  object-fit: cover;
  background: linear-gradient(140deg, var(--ink) 0%, var(--night) 58%, var(--celadon) 100%);
}

.page-about .about-hero__fig figcaption,
.page-about .about-bandfig figcaption,
.page-about .about-team__fig figcaption {
  margin-top: .75em;
  font-size: 12px;
  line-height: 1.7;
  color: var(--slate);
}

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

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: end;
  }

  .page-about .about-hero__text {
    grid-column: 1;
  }

  .page-about .about-hero__fig {
    grid-column: 2;
  }
}

@media (min-width: 1120px) {
  .page-about .about-hero__annot {
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .16em;
    color: var(--slate);
    pointer-events: none;
    user-select: none;
  }
}

/* 通用标题 */
.page-about .about-h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.22;
  color: var(--ink);
  margin: 0 0 .55em;
}

/* 我们做什么 */
.page-about .about-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 32px);
  padding-block: clamp(40px, 6vw, 74px);
}

.page-about .about-intro__body p {
  margin: 0 0 1.05em;
  max-width: 66ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
}

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

@media (min-width: 900px) {
  .page-about .about-intro {
    grid-template-columns: minmax(0, .40fr) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 70px);
  }
}

/* 时间线 */
.page-about .about-history__head {
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 clamp(28px, 4vw, 46px) 28px;
  border-left: 1px solid var(--line);
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--sand);
  border: 2px solid var(--celadon);
  transition: background .22s ease, border-color .22s ease, box-shadow .22s ease;
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--spark);
  border-color: var(--spark);
  box-shadow: 0 0 0 4px rgba(23, 195, 178, .16);
}

.page-about .tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 6.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .tl__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.4;
  color: var(--ink);
  margin: .7em 0 .5em;
}

.page-about .tl__body p {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.8;
}

.page-about .tl__more {
  margin-top: .9em;
  padding-top: .6em;
  border-top: 1px dashed var(--line);
  max-width: 62ch;
}

.page-about .tl__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--celadon);
  transition: color .2s ease;
}

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

.page-about .tl__more summary::before {
  content: "+ ";
  color: var(--spark);
  font-weight: 700;
}

.page-about .tl__more[open] summary::before {
  content: "– ";
}

.page-about .tl__more summary:hover,
.page-about .tl__item:hover .tl__more summary {
  color: var(--spark);
}

.page-about .tl__more summary:focus-visible {
  outline: 2px solid var(--spark);
  outline-offset: 3px;
  border-radius: 3px;
}

.page-about .tl__more p {
  margin: .55em 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--slate);
}

@media (min-width: 780px) {
  .page-about .tl__item {
    display: grid;
    grid-template-columns: 138px minmax(0, 1fr);
    column-gap: clamp(20px, 3vw, 40px);
    padding-left: 44px;
  }

  .page-about .tl__year {
    grid-column: 1;
    font-size: clamp(30px, 3.4vw, 42px);
    padding-top: .06em;
  }

  .page-about .tl__body {
    grid-column: 2;
  }

  .page-about .tl__title {
    margin-top: 0;
  }
}

/* 历程通栏图 */
.page-about .about-bandfig {
  margin: clamp(32px, 5vw, 56px) 0 clamp(40px, 6vw, 72px);
}

.page-about .about-bandfig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: cover;
  background: linear-gradient(100deg, var(--sand) 0%, var(--mist) 50%, var(--sand) 100%);
}

/* 数据带 */
.page-about .about-stats {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  padding: clamp(28px, 4.4vw, 54px) clamp(22px, 4vw, 52px);
  background: linear-gradient(150deg, var(--ink) 0%, var(--night) 100%);
  color: var(--sand);
}

.page-about .about-stats::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 46px 46px;
  pointer-events: none;
}

.page-about .about-stats__title {
  position: relative;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.3;
  color: var(--mist);
  margin: 0 0 clamp(24px, 3.4vw, 38px);
  letter-spacing: .02em;
}

.page-about .about-stats__grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(22px, 3.2vw, 34px);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--spark);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__unit {
  font-size: .48em;
  margin-left: .14em;
  color: var(--mist);
}

.page-about .about-stat__label {
  display: block;
  margin-top: .7em;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .about-stats__foot {
  position: relative;
  margin: clamp(26px, 3.4vw, 38px) 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(207, 231, 227, .18);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

@media (min-width: 820px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-stat {
    padding: 0 clamp(16px, 2.2vw, 28px);
    border-left: 1px solid rgba(207, 231, 227, .16);
  }

  .page-about .about-stat:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-stat:last-child {
    padding-right: 0;
  }
}

/* 团队与地区 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  padding-block: clamp(44px, 6.4vw, 84px);
}

.page-about .about-team__text p {
  margin: 0 0 1.05em;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  max-width: 520px;
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-roles__name {
  font-size: 15px;
  color: var(--graphite);
}

.page-about .about-roles__num {
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.2vw, 23px);
  font-weight: 700;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.page-about .about-roles__unit {
  font-size: .6em;
  margin-left: .18em;
  color: var(--slate);
  font-weight: 400;
}

.page-about .about-team__fig {
  margin: 0;
  align-self: start;
}

.page-about .about-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: cover;
  background: linear-gradient(160deg, var(--mist) 0%, var(--dune) 100%);
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, .72fr);
    gap: clamp(36px, 5vw, 72px);
  }
}

/* 实际收益 */
.page-about .about-why__head {
  max-width: 58ch;
  margin-bottom: clamp(26px, 3.6vw, 42px);
}

.page-about .about-why__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-pillar {
  position: relative;
  height: 100%;
  padding: clamp(26px, 3.2vw, 34px) clamp(22px, 3vw, 30px) clamp(24px, 3vw, 30px);
  background: var(--about-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}

.page-about .about-pillar::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(22px, 3vw, 30px);
  width: 40px;
  height: 3px;
  background: var(--spark);
  border-radius: 0 0 3px 3px;
}

.page-about .about-pillar:hover,
.page-about .about-pillar:focus-within {
  transform: translateY(-4px);
  border-color: var(--celadon);
  box-shadow: 0 16px 34px rgba(10, 42, 67, .11);
}

.page-about .about-pillar__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--celadon);
  margin-bottom: 1.1em;
}

.page-about .about-pillar__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.42;
  color: var(--ink);
  margin: 0 0 .6em;
}

.page-about .about-pillar__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

@media (min-width: 800px) {
  .page-about .about-why__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-why__grid > .about-pillar:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .about-why__grid > .about-pillar:nth-child(3) {
    margin-top: 14px;
  }
}

/* 下一步 */
.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  align-items: end;
  margin-top: clamp(44px, 6vw, 82px);
  padding: clamp(26px, 3.6vw, 42px) clamp(22px, 3.4vw, 40px);
  background: var(--mist);
  border-radius: var(--radius-lg);
}

.page-about .about-next__text p {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-next__acts {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
}

.page-about .about-textlink {
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
  transition: color .2s ease, border-color .2s ease;
}

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

.page-about .about-textlink:focus-visible {
  outline: 2px solid var(--spark);
  outline-offset: 4px;
  border-radius: 3px;
}

@media (min-width: 860px) {
  .page-about .about-next {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: clamp(30px, 5vw, 64px);
  }
}

/* 末尾说明行 */
.page-about .trust-line {
  margin-top: clamp(28px, 4vw, 44px);
  font-size: 12px;
  line-height: 1.7;
  color: var(--slate);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-pillar,
  .page-about .tl__item::before,
  .page-about .tl__more summary,
  .page-about .about-textlink,
  .page-about .about-crumb .crumb a {
    transition: none;
  }

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