.page-about {
  --about-radius: 3px;
  background: var(--mist);
  color: var(--graphite);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background: var(--night);
  color: var(--mist);
  padding: clamp(24px, 5vw, 56px) 0 clamp(28px, 5vw, 56px);
  border-bottom: 2px solid var(--grass);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(20px, 4vw, 40px);
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: rgba(243, 247, 244, 0.6);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(243, 247, 244, 0.32);
}

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

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-size: clamp(32px, 6.6vw, 84px);
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  color: rgba(243, 247, 244, 0.82);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  border-top: 2px solid var(--grass);
  border-left: 2px solid var(--grass);
}

.page-about .about-facts > div {
  padding: 12px 14px 14px;
  border-right: 2px solid var(--grass);
  border-bottom: 2px solid var(--grass);
}

.page-about .about-facts dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(243, 247, 244, 0.55);
}

.page-about .about-facts dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

/* ---------- 横幅 ---------- */
.page-about .about-banner {
  margin: 0;
  background: var(--grass-deep);
  border-bottom: 2px solid var(--grass-deep);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: clamp(170px, 30vw, 340px);
  object-fit: cover;
}

.page-about .about-banner figcaption {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 12px var(--gutter) 14px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(243, 247, 244, 0.68);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  background: var(--paper);
  padding: clamp(40px, 7vw, 84px) 0;
}

.page-about .about-timeline__head {
  margin-bottom: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(16px, 2.4vw, 24px);
  border-bottom: 2px solid var(--grass-deep);
}

.page-about .about-timeline__head .section-title {
  margin: 10px 0 0;
  max-width: 22ch;
}

.page-about .about-timeline__body {
  display: grid;
  gap: clamp(16px, 3vw, 40px);
}

.page-about .about-rail ol {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail ol::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 74px;
  padding: 7px 14px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--grass-deep);
  text-decoration: none;
  border: 2px solid rgba(8, 48, 44, 0.18);
  border-radius: 999px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

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

.page-about .about-entries {
  min-width: 0;
}

.page-about .about-entry {
  display: grid;
  gap: 12px;
  padding: clamp(22px, 3.4vw, 36px) 0;
  border-top: 2px solid rgba(8, 48, 44, 0.12);
  scroll-margin-top: calc(var(--pod-h) + 24px);
}

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

.page-about .about-entry__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--signal);
}

.page-about .about-entry__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.2vw, 27px);
  font-weight: 900;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--grass-deep);
}

.page-about .about-entry__main p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--graphite);
}

.page-about .about-entry__note {
  margin: 0;
  padding: 10px 0 0;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.08em;
  color: var(--gray);
  border-top: 2px dashed rgba(126, 141, 150, 0.4);
}

.page-about .about-entry__figure {
  margin: clamp(18px, 3vw, 28px) 0 0;
  border: 2px solid var(--grass-deep);
  border-radius: var(--about-radius);
  background: var(--night);
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-entry__figure figcaption {
  padding: 10px 14px 12px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.08em;
  color: rgba(243, 247, 244, 0.72);
}

/* ---------- 数字墙 ---------- */
.page-about .about-wall {
  background: var(--grass-deep);
  color: var(--mist);
  padding: clamp(40px, 6.4vw, 78px) 0;
}

.page-about .about-wall__head {
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-about .about-wall__head .section-title {
  margin: 10px 0 0;
  max-width: 20ch;
  color: var(--mist);
}

.page-about .about-wall__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: rgba(62, 217, 190, 0.28);
  border: 2px solid rgba(62, 217, 190, 0.4);
}

.page-about .about-wall__cell {
  background: var(--grass-deep);
  padding: clamp(16px, 2.8vw, 28px);
}

.page-about .about-wall__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 5.4vw, 60px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-wall__unit {
  margin-left: 2px;
  font-size: 0.4em;
  font-weight: 600;
  color: var(--amber);
  letter-spacing: 0;
}

.page-about .about-wall__label {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: 0.06em;
  color: rgba(243, 247, 244, 0.72);
}

/* ---------- 数据流程 ---------- */
.page-about .about-steps-section {
  background: var(--paper);
  padding: clamp(40px, 6.4vw, 78px) 0;
  border-bottom: 2px solid rgba(8, 48, 44, 0.12);
}

.page-about .about-steps-section__head {
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .about-steps-section__head .section-title {
  margin: 10px 0 0;
  max-width: 24ch;
}

.page-about .about-steps {
  display: grid;
  gap: 2px;
  background: rgba(8, 48, 44, 0.16);
  border: 2px solid var(--grass-deep);
  border-radius: var(--about-radius);
}

.page-about .about-step {
  background: var(--mist);
  padding: clamp(20px, 3vw, 32px);
}

.page-about .about-step__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .about-step__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--grass-deep);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--graphite);
}

.page-about .about-step p + p {
  margin-top: 10px;
}

.page-about .about-steps-section__tail {
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
}

.page-about .about-steps-section__tail a {
  color: var(--grass);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--grass);
}

.page-about .about-steps-section__tail a:hover {
  color: var(--signal);
  border-color: var(--signal);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--mist);
  padding: clamp(40px, 6.4vw, 78px) 0;
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-team__text .section-title {
  margin: 10px 0 16px;
  max-width: 18ch;
}

.page-about .about-team__text > p {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--graphite);
}

.page-about .about-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--grass);
}

.page-about .about-team__list li {
  display: grid;
  gap: 2px;
  padding: 12px 0 13px;
  border-bottom: 2px solid rgba(15, 122, 106, 0.16);
}

.page-about .about-team__name {
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--grass-deep);
}

.page-about .about-team__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
}

.page-about .about-team__figure {
  margin: 0;
  border: 2px solid var(--grass-deep);
  border-radius: var(--about-radius);
  background: var(--night);
  box-shadow: var(--shadow-hard);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team__figure figcaption {
  padding: 10px 14px 12px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: rgba(243, 247, 244, 0.72);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  background: var(--paper);
  padding: clamp(36px, 5.6vw, 68px) 0;
  border-top: 2px solid var(--grass-deep);
  border-bottom: 2px solid var(--grass-deep);
}

.page-about .about-partners .section-title {
  margin: 10px 0 clamp(20px, 3vw, 32px);
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-partners__main p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--graphite);
}

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

.page-about .about-partners__main a {
  color: var(--grass);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--grass);
}

.page-about .about-partners__main a:hover {
  color: var(--signal);
  border-color: var(--signal);
}

.page-about .about-partners__figures {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(8, 48, 44, 0.14);
  border: 2px solid var(--grass-deep);
}

.page-about .about-partners__figures li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  background: var(--mist);
  font-size: 13px;
  line-height: 1.6;
  color: var(--graphite);
}

.page-about .about-partners__figures .numeric {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
}

/* ---------- 联系 ---------- */
.page-about .about-feedback {
  background: var(--night);
  color: var(--mist);
  padding: clamp(40px, 6.4vw, 78px) 0 clamp(44px, 7vw, 88px);
}

.page-about .about-feedback__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-feedback .section-title {
  margin: 10px 0 16px;
  color: var(--paper);
}

.page-about .about-feedback__grid > div > p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(243, 247, 244, 0.82);
}

.page-about .about-feedback__grid a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(62, 217, 190, 0.5);
}

.page-about .about-feedback__grid a:hover {
  color: var(--amber);
  border-color: var(--amber);
}

.page-about .about-feedback__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-feedback__actions .btn {
  text-decoration: none;
  border-bottom: 0;
}

.page-about .about-feedback__card {
  align-self: start;
  padding: clamp(18px, 3vw, 26px);
  border: 2px solid var(--grass);
  border-radius: var(--about-radius);
  background: var(--grass-deep);
}

.page-about .about-feedback__card-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-feedback__line {
  display: grid;
  gap: 2px;
  margin: 0 0 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid rgba(62, 217, 190, 0.18);
}

.page-about .about-feedback__line span {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(243, 247, 244, 0.55);
}

.page-about .about-feedback__line a {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cyan);
  border-bottom: 0;
  word-break: break-all;
}

.page-about .about-feedback__hours {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: rgba(243, 247, 244, 0.6);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-wall__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-partners__figures li {
    justify-content: space-between;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .about-facts > div {
    padding: 14px 16px 16px;
  }

  .page-about .about-timeline__body {
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--pod-h) + 20px);
    align-self: start;
  }

  .page-about .about-rail ol {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-left: 2px solid var(--grass);
    padding-bottom: 0;
  }

  .page-about .about-rail li {
    position: relative;
  }

  .page-about .about-rail__link {
    min-width: 0;
    width: 100%;
    justify-content: flex-start;
    padding: 12px 0 12px 18px;
    border: 0;
    border-radius: 0;
    font-size: 14px;
    color: var(--gray);
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 50%;
    width: 8px;
    height: 8px;
    transform: translateY(-50%);
    background: var(--grass);
    border-radius: 1px;
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    background: var(--signal);
  }

  .page-about .about-entry {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    column-gap: clamp(20px, 3.4vw, 44px);
    align-items: start;
  }

  .page-about .about-entry:nth-child(even) {
    grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
  }

  .page-about .about-entry__note {
    padding-top: 8px;
    border-top: 2px solid rgba(126, 141, 150, 0.4);
  }

  .page-about .about-entry__figure {
    margin-top: clamp(22px, 3vw, 34px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-feedback__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-entry__figure {
    grid-column: 1 / -1;
  }

  .page-about .about-entry__figure img {
    aspect-ratio: 21 / 9;
  }
}
<<<END>>>