.page-about {
  --about-gap: clamp(20px, 4vw, 40px);
  --about-pad: clamp(40px, 7vw, 84px);
  --about-edge: #14705f;
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

/* 面包屑 */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: clamp(18px, 3vw, 30px) 0 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

.page-about .breadcrumbs__sep {
  color: var(--line);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 52px) 0 clamp(40px, 7vw, 78px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -140px;
  width: 460px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line));
  transform: rotate(-38deg);
  transform-origin: right center;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: end;
}

.page-about .eyebrow {
  margin: 0;
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-about h1 {
  margin: 12px 0 0;
  max-width: 16em;
}

.page-about .lede {
  margin: 20px 0 0;
  max-width: 40em;
  color: var(--mist);
  line-height: 1.85;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(102px, 1fr));
  gap: 18px 20px;
  margin: 32px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero__stat dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-hero__stat dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.35rem, 3vw, 1.7rem);
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-hero__jump {
  margin: 26px 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .about-hero__jump .text-link {
  color: var(--mist);
}

.page-about .about-hero__jump .text-link:hover,
.page-about .about-hero__jump .text-link:focus-visible {
  color: var(--cyan);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--char);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 52%, rgba(6, 43, 37, 0.78));
  pointer-events: none;
}

/* 时间轴 */
.page-about .about-track {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .section-head {
  margin: 0 0 clamp(20px, 4vw, 36px);
}

.page-about .section-head__index {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .section-head .title-lg {
  margin: 0;
  max-width: 22em;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 55%, rgba(41, 84, 76, 0));
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 30px 34px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 12px;
  height: 12px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: background 0.2s ease;
}

.page-about .tl-item:hover::before {
  background: var(--cyan);
}

.page-about .tl-item__index {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .tl-item__index::after {
  content: "";
  display: inline-block;
  width: 2px;
  height: 14px;
  background: var(--cyan);
  opacity: 0.6;
  transform: skewX(-22deg);
}

.page-about .tl-item__year {
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  font-weight: 600;
  line-height: 1;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .tl-item__label {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .tl-item__body h3 {
  margin: 0 0 10px;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
}

.page-about .tl-item__body p {
  margin: 0;
  max-width: 62ch;
  color: var(--mist);
  line-height: 1.8;
}

.page-about .tl-note {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.page-about .tl-note summary {
  cursor: pointer;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
}

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

.page-about .tl-note summary::before {
  content: "＋ ";
}

.page-about .tl-note[open] summary::before {
  content: "－ ";
}

.page-about .tl-note p {
  margin: 10px 0 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--mist);
}

/* 数据工序 */
.page-about .about-flow {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .flow-item {
  background: var(--ink);
  padding: clamp(20px, 3.5vw, 30px);
  border-left: 2px solid transparent;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .flow-item:hover {
  background: #08352e;
  border-left-color: var(--cyan);
}

.page-about .flow-item__num {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .flow-item h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.page-about .flow-item p {
  margin: 0;
  color: var(--mist);
  font-size: 0.95rem;
  line-height: 1.78;
}

/* 版本跃迁 */
.page-about .about-versions {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .ver-item {
  background: var(--ink);
  padding: 22px 20px 26px;
  display: grid;
  gap: 8px;
  align-content: start;
  position: relative;
  transition: background 0.25s ease;
}

.page-about .ver-item:hover {
  background: #08352e;
}

.page-about .ver-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.page-about .ver-item:hover::before {
  opacity: 1;
}

.page-about .ver-item__num {
  font-size: 1.6rem;
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .ver-item__tag {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .ver-item h3 {
  margin: 4px 0 0;
  font-size: 1.05rem;
}

.page-about .ver-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--mist);
}

/* 团队（纸白区） */
.page-about .about-team {
  background: var(--paper);
  color: var(--char);
  padding: var(--about-pad) 0;
  margin-top: clamp(40px, 7vw, 76px);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-team .section-head__index {
  color: var(--about-edge);
}

.page-about .about-team__lede {
  margin: 16px 0 0;
  max-width: 56ch;
  color: #33463f;
  line-height: 1.8;
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid #d5e2dd;
  overflow: hidden;
  background: var(--char);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-team .media-frame__caption {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: #5c736b;
}

.page-about .about-team__note {
  border-top: 2px solid var(--about-edge);
  padding-top: 16px;
}

.page-about .about-team__note-label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--about-edge);
}

.page-about .about-team__note p {
  margin: 0;
  color: #33463f;
  line-height: 1.82;
}

.page-about .role-grid {
  display: grid;
  gap: 1px;
  background: #d5e2dd;
  border: 1px solid #d5e2dd;
}

.page-about .role-card {
  background: #ffffff;
  padding: 22px 20px 26px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .role-card__num {
  display: block;
  font-size: 2.2rem;
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.page-about .role-card__label {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--about-edge);
}

.page-about .role-card__desc {
  margin: 14px 0 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: #33463f;
}

/* 覆盖与协作 */
.page-about .about-reach {
  padding: var(--about-pad) 0;
}

.page-about .reach-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .reach-status {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .reach-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
}

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

.page-about .reach-item {
  background: var(--ink);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 14px;
  padding: 13px 16px;
  transition: background 0.2s ease;
}

.page-about .reach-item:hover {
  background: #0a3a32;
}

.page-about .reach-item[hidden] {
  display: none;
}

.page-about .reach-item__name {
  font-size: 0.95rem;
  font-weight: 600;
}

.page-about .reach-item__meta {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .reach-empty {
  margin: 14px 0 0;
  font-size: 0.92rem;
  color: var(--mist);
}

.page-about .reach-side {
  display: grid;
  gap: clamp(20px, 3vw, 28px);
  align-content: start;
}

.page-about .reach-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
  margin: 0;
}

.page-about .reach-figure {
  border-left: 2px solid var(--line);
  padding-left: 14px;
}

.page-about .reach-figure dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .reach-figure dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .reach-figure__unit {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-reach__media {
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--char);
}

.page-about .about-reach__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
}

/* 里程碑 */
.page-about .about-recognition {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .rec-item {
  position: relative;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .rec-item__year {
  display: block;
  margin-bottom: 10px;
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--yellow);
}

.page-about .rec-item h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.page-about .rec-item p {
  margin: 0;
  color: var(--mist);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* 收尾 */
.page-about .about-cta {
  padding: 0 0 clamp(48px, 8vw, 92px);
}

.page-about .about-cta__inner {
  position: relative;
  padding: clamp(26px, 5vw, 52px);
  background: linear-gradient(140deg, #0d3b33 0%, var(--char) 78%);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .about-cta__index {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-cta__inner h2 {
  margin: 0;
  max-width: 20em;
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  max-width: 52ch;
  color: var(--mist);
  line-height: 1.8;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-about .flow-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .rec-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 3vw, 32px);
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-timeline::before {
    left: 151px;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 140px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    padding: 0 0 clamp(34px, 5vw, 56px) 0;
  }

  .page-about .tl-item::before {
    left: 146px;
    top: 10px;
  }

  .page-about .tl-item__index {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    margin-bottom: 0;
  }

  .page-about .ver-track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

  .page-about .about-team__note {
    border-top: none;
    border-left: 2px solid var(--about-edge);
    padding: 0 0 0 18px;
    margin-top: 4px;
  }

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

  .page-about .reach-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: clamp(32px, 4vw, 56px);
  }

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

@media (min-width: 1100px) {
  .page-about .about-hero__media img {
    aspect-ratio: 3 / 2.1;
  }
}
<<<END>>>