.page-about {
  --about-shift: 48px;
  --about-rule: rgba(231, 223, 203, 0.22);
}

.page-about__crumb {
  padding-top: 1rem;
  padding-bottom: 0.25rem;
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--slate);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-about .breadcrumb a {
  color: var(--slate);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--gold);
}

.page-about .breadcrumb__sep {
  color: var(--hairline-strong);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--mint);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: 2.25rem;
  padding-bottom: 3.5rem;
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% 40% 40% -20%;
  background: radial-gradient(closest-side, rgba(43, 75, 216, 0.55), rgba(10, 15, 44, 0) 70%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

.page-about .about-hero__title {
  margin: 0.75rem 0 1.25rem;
  color: var(--mist);
  line-height: 1.12;
  max-width: 14ch;
}

.page-about .about-hero__lede {
  max-width: 32rem;
  color: var(--mist);
  opacity: 0.86;
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 1rem;
  margin: 2.5rem 0 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-hero__stat dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--slate);
  margin-bottom: 0.35rem;
}

.page-about .about-hero__stat dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  color: var(--mist);
}

.page-about .about-hero__n {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .about-hero__u {
  font-size: 0.78rem;
  color: var(--slate);
}

.page-about .about-hero__media {
  margin: 0;
  clip-path: var(--cut);
  background: var(--ink-1);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 14 / 8;
}

.page-about .about-hero__media figcaption {
  padding: 0.85rem 1.1rem 1.05rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--slate);
  border-top: 1px solid var(--about-rule);
}

/* ---------- 起步 ---------- */

.page-about .about-start {
  padding-top: 2.5rem;
  padding-bottom: 3.5rem;
}

.page-about .about-start__head {
  margin-bottom: 2rem;
}

.page-about .about-start__title {
  color: var(--mist);
  margin: 0.5rem 0 0;
}

.page-about .about-start__body {
  display: grid;
  gap: 2rem;
}

.page-about .about-start__prose p {
  color: var(--mist);
  opacity: 0.84;
  margin: 0 0 1rem;
  max-width: 34rem;
}

.page-about .about-start__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-start__list .rule-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-start__list .rule-item__num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--mint);
  letter-spacing: 0.06em;
  padding-top: 0.2rem;
}

.page-about .about-start__item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  color: var(--paper);
}

.page-about .about-start__item p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 方法 ---------- */

.page-about .about-method {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.page-about .about-method__head {
  margin-bottom: 2.25rem;
}

.page-about .about-method__title {
  color: var(--ink-0);
  margin: 0.5rem 0 0.85rem;
}

.page-about .about-method__lede {
  color: var(--ink-1);
  max-width: 36rem;
}

.page-about .about-method__grid {
  display: grid;
  gap: 2rem;
  align-items: start;
}

.page-about .about-method__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.page-about .about-method__step {
  padding-left: 1.15rem;
  border-left: 2px solid var(--cobalt);
}

.page-about .about-method__n {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--cobalt);
  margin-bottom: 0.45rem;
}

.page-about .about-method__step h3 {
  margin: 0 0 0.45rem;
  font-size: 1.1rem;
  color: var(--ink-0);
}

.page-about .about-method__step p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--ink-1);
}

.page-about .about-method__diagram {
  margin: 0;
  padding: 1.25rem;
  background: var(--ink-0);
  clip-path: var(--cut);
}

.page-about .about-method__diagram svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-method__diagram figcaption {
  margin-top: 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--slate);
  text-align: right;
}

.page-about .about-method__photo {
  margin: 2.5rem 0 0;
  display: grid;
  gap: 0;
  background: var(--paper);
  clip-path: var(--cut);
}

.page-about .about-method__photo img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 8 / 5;
}

.page-about .about-method__photo figcaption {
  padding: 0.85rem 1.1rem 1.05rem;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--ink-1);
  border-top: 1px solid rgba(10, 15, 44, 0.12);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  padding-top: 3rem;
  padding-bottom: 3.25rem;
}

.page-about .about-timeline__head {
  margin-bottom: 2rem;
}

.page-about .about-timeline__title {
  color: var(--mist);
  margin: 0.5rem 0 0.85rem;
}

.page-about .about-timeline__lede {
  color: var(--mist);
  opacity: 0.84;
  max-width: 34rem;
}

.page-about .about-timeline__track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-timeline__card {
  background: var(--ink-1);
  border-left: 2px solid var(--mint);
  padding: 1.15rem 1.25rem;
}

.page-about .about-timeline__card[open] {
  border-left-color: var(--gold);
}

.page-about .about-timeline__sum {
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0.25rem 0.75rem;
}

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

.page-about .about-timeline__year {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-timeline__h {
  grid-column: 1;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-timeline__chev {
  grid-column: 2;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--slate);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-timeline__card[open] .about-timeline__chev {
  transform: rotate(45deg);
  color: var(--gold);
}

.page-about .about-timeline__detail {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-timeline__detail p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding-top: 3rem;
  padding-bottom: 3.25rem;
}

.page-about .about-team__head {
  margin-bottom: 2.25rem;
}

.page-about .about-team__title {
  color: var(--ink-0);
  margin: 0.5rem 0 0.85rem;
}

.page-about .about-team__lede {
  color: var(--ink-1);
  max-width: 34rem;
}

.page-about .about-team__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-team__roster {
  display: grid;
  gap: 1rem;
}

.page-about .about-team__squad {
  background: var(--paper);
  clip-path: var(--cut-sm);
  padding: 1.35rem 1.4rem 1.5rem;
  border-top: 3px solid var(--cobalt);
}

.page-about .about-team__squad:nth-child(2) {
  border-top-color: var(--coral);
}

.page-about .about-team__squad:nth-child(3) {
  border-top-color: var(--mint-deep);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ink-0);
  display: block;
}

.page-about .about-team__squad h3 {
  margin: 0.4rem 0 0.5rem;
  font-size: 1.05rem;
  color: var(--ink-0);
}

.page-about .about-team__squad p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--ink-1);
}

.page-about .about-team__media {
  margin: 0;
  background: var(--paper);
  clip-path: var(--cut);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 12 / 7;
}

.page-about .about-team__media figcaption {
  padding: 0.85rem 1.1rem 1.05rem;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--ink-1);
  border-top: 1px solid rgba(10, 15, 44, 0.12);
}

.page-about .about-team__flow {
  margin-top: 2.5rem;
  padding: 1.5rem 1.4rem;
  background: var(--ink-1);
  clip-path: var(--cut);
}

.page-about .about-team__flow h3 {
  margin: 0 0 1rem;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .about-team__flowlist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-team__flowlist li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--about-rule);
}

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

.page-about .about-team__flownum {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--mint);
  padding-top: 0.2rem;
}

.page-about .about-team__flowlist p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mist);
  opacity: 0.86;
}

/* ---------- 节律 ---------- */

.page-about .about-rhythm {
  padding-top: 3rem;
  padding-bottom: 3.25rem;
}

.page-about .about-rhythm__head {
  margin-bottom: 2rem;
}

.page-about .about-rhythm__title {
  color: var(--mist);
  margin: 0.5rem 0 0.85rem;
}

.page-about .about-rhythm__lede {
  color: var(--mist);
  opacity: 0.84;
  max-width: 34rem;
}

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

.page-about .about-rhythm__list li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  column-gap: 1rem;
  padding: 1.15rem 0;
  border-top: 1px solid var(--about-rule);
}

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

.page-about .about-rhythm__freq {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--gold);
  padding-top: 0.15rem;
  border-right: 1px solid var(--about-rule);
}

.page-about .about-rhythm__list h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .about-rhythm__list p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 伙伴 ---------- */

.page-about .about-partners {
  padding-top: 3rem;
  padding-bottom: 3.25rem;
}

.page-about .about-partners__head {
  margin-bottom: 2.25rem;
}

.page-about .about-partners__title {
  color: var(--ink-0);
  margin: 0.5rem 0 0.85rem;
}

.page-about .about-partners__lede {
  color: var(--ink-1);
  max-width: 34rem;
}

.page-about .about-partners__grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-partners__card {
  background: var(--paper);
  padding: 1.4rem 1.4rem 1.6rem;
  clip-path: var(--cut);
  border-left: 3px solid var(--mint-deep);
}

.page-about .about-partners__card:nth-child(2) {
  border-left-color: var(--cobalt);
}

.page-about .about-partners__card:nth-child(3) {
  border-left-color: var(--coral);
}

.page-about .about-partners__card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
  color: var(--ink-0);
}

.page-about .about-partners__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--ink-1);
}

/* ---------- 标准 ---------- */

.page-about .about-standards {
  padding-top: 3rem;
  padding-bottom: 3.5rem;
  background:
    radial-gradient(ellipse at 80% 0%, rgba(255, 107, 74, 0.16), transparent 60%),
    var(--ink-0);
}

.page-about .about-standards__head {
  margin-bottom: 2rem;
}

.page-about .about-standards__title {
  color: var(--mist);
  margin: 0.5rem 0 0;
}

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

.page-about .about-standards__list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 1rem;
  padding: 1.15rem 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-standards__n {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding-top: 0.25rem;
}

.page-about .about-standards__list strong {
  font-size: 1.05rem;
  color: var(--paper);
  font-weight: 700;
}

.page-about .about-standards__list p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-standards__foot {
  margin-top: 2.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--hairline-strong);
  display: grid;
  gap: 1rem;
  align-items: center;
}

.page-about .about-standards__foot p {
  margin: 0;
  color: var(--mist);
  opacity: 0.88;
  font-size: 0.95rem;
  line-height: 1.85;
}

/* ---------- 响应式 ---------- */

@media (min-width: 600px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team__roster {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team__roster .about-team__squad:first-child {
    grid-column: 1 / -1;
  }

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

@media (min-width: 880px) {
  .page-about .about-hero {
    padding-top: 3rem;
    padding-bottom: 4.5rem;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 7fr 5fr;
    gap: 3.5rem;
  }

  .page-about .about-hero__media img {
    aspect-ratio: 4 / 3;
  }

  .page-about .about-start__body {
    grid-template-columns: 5fr 7fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-method__grid {
    grid-template-columns: 6fr 5fr;
    gap: 3rem;
    align-items: stretch;
  }

  .page-about .about-method__diagram {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-about .about-method__photo {
    grid-template-columns: auto 1fr;
    align-items: stretch;
  }

  .page-about .about-method__photo img {
    aspect-ratio: 1 / 1;
    max-height: 320px;
    object-fit: cover;
  }

  .page-about .about-method__photo figcaption {
    border-top: 0;
    border-left: 1px solid rgba(10, 15, 44, 0.12);
    display: flex;
    align-items: center;
    font-size: 0.88rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: 7fr 5fr;
    gap: 2.5rem;
    align-items: stretch;
  }

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

  .page-about .about-team__roster .about-team__squad:first-child {
    grid-column: auto;
  }

  .page-about .about-team__media {
    display: flex;
    flex-direction: column;
  }

  .page-about .about-team__media img {
    flex: 1 1 auto;
    aspect-ratio: auto;
    height: 100%;
    min-height: 240px;
  }

  .page-about .about-team__flowlist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 2rem;
  }

  .page-about .about-team__flowlist li:nth-child(2) {
    border-top: 0;
    padding-top: 0;
  }

  .page-about .about-standards__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 3rem;
  }

  .page-about .about-standards__list li:nth-child(2) {
    border-top: 1px solid var(--about-rule);
  }

  .page-about .about-standards__foot {
    grid-template-columns: 1fr auto;
    gap: 2rem;
  }
}

@media (min-width: 1080px) {
  .page-about .about-timeline__track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.85rem;
    padding: var(--about-shift) 0;
  }

  .page-about .about-timeline__node:nth-child(even) {
    margin-top: var(--about-shift);
  }

  .page-about .about-rhythm__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 3rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__chev {
    transition: none;
  }
}
<<<END>>>