.page-about {
  --about-rail: 2.6rem;
  --about-pad: clamp(1.1rem, 2.6vw, 1.8rem);
  --about-line: var(--grid);
  background-color: var(--ink);
  color: var(--text);
  padding-top: calc(var(--header-h) + 1.4rem);
  overflow-x: clip;
}

.page-about .section {
  padding-block: clamp(2.2rem, 5.5vw, 4.2rem);
}

.page-about .breadcrumb {
  padding-block: 0.4rem 0.8rem;
}

.page-about .about-link {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid var(--teal-deep);
}

.page-about .about-link:hover {
  color: var(--orange-soft);
  border-bottom-color: var(--orange);
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  align-items: start;
  padding-bottom: clamp(1.8rem, 4vw, 2.8rem);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__title {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.5rem, 7.6vw, 5.2rem);
  line-height: 0.98;
  letter-spacing: -0.015em;
}

.page-about .about-hero__lede {
  margin-top: 1.1rem;
  max-width: 46ch;
  color: var(--muted);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.page-about .about-console {
  position: relative;
  border: 1px solid var(--edge);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(54, 242, 192, 0.12), transparent 62%),
    var(--module);
  padding: var(--about-pad);
}

.page-about .about-console::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to bottom, rgba(29, 59, 84, 0.6) 1px, transparent 1px);
  background-size: 100% 30px;
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-console__head {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.6rem;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-stat {
  position: relative;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.78rem 0;
  border-bottom: 1px solid rgba(39, 71, 100, 0.85);
}

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

.page-about .about-stat__value {
  font-family: var(--font-num);
  font-size: clamp(1.35rem, 3.4vw, 1.8rem);
  line-height: 1.1;
  color: var(--teal);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.page-about .about-stat__value small {
  margin-left: 0.25em;
  font-family: var(--font-body);
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .about-stat__label {
  font-size: 0.82rem;
  color: var(--muted);
  text-align: right;
}

/* 业务轮廓 */
.page-about .about-copy {
  display: grid;
  gap: 0.9rem;
  max-width: 68ch;
  margin-top: clamp(1rem, 2.4vw, 1.5rem);
  color: var(--muted);
}

.page-about .about-copy p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.82;
}

.page-about .about-copy p:first-child {
  color: var(--text);
  font-size: 1.04rem;
}

.page-about .about-lines {
  list-style: none;
  margin: clamp(1.5rem, 3.4vw, 2.2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-lines__item {
  background: var(--module);
  padding: var(--about-pad);
  display: grid;
  gap: 0.5rem;
  align-content: start;
}

.page-about .about-lines__item:first-child {
  background:
    linear-gradient(180deg, rgba(54, 242, 192, 0.1), transparent 70%),
    var(--module);
  box-shadow: inset 0 2px 0 var(--teal);
}

.page-about .about-lines__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .about-lines__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-audience {
  display: grid;
  gap: 0.5rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
  padding-top: 1.2rem;
  border-top: 1px solid var(--about-line);
}

.page-about .about-audience__k {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.page-about .about-audience__k .numeric {
  font-family: var(--font-num);
  color: var(--orange);
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.page-about .about-audience__note {
  margin: 0.6rem 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 62ch;
}

/* 时间线 */
.page-about .about-sub {
  margin: 0.8rem 0 0;
  max-width: 58ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-history__media {
  width: 100%;
  margin: clamp(1.3rem, 3vw, 2rem) 0 clamp(1.4rem, 3vw, 2.2rem);
}

.page-about .media-frame {
  width: 100%;
}

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

.page-about .about-tl {
  display: grid;
  gap: 0;
}

.page-about .about-tl .accordion__item {
  position: relative;
  padding-left: var(--about-rail);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-tl .accordion__item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rail) / 2);
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--edge);
  transform: translateX(-0.5px);
}

.page-about .about-tl .accordion__item:first-child::before {
  top: 1.6rem;
}

.page-about .about-tl .accordion__item:last-child::before {
  bottom: calc(100% - 1.6rem);
}

.page-about .about-tl .accordion__item::after {
  content: "";
  position: absolute;
  left: calc(var(--about-rail) / 2 - 5px);
  top: 1.5rem;
  width: 10px;
  height: 10px;
  border: 1px solid var(--orange);
  background: var(--ink);
  transform: rotate(45deg);
}

.page-about .about-tl .accordion__item.is-current::after {
  background: var(--teal);
  border-color: var(--teal);
  box-shadow: 0 0 0 4px rgba(54, 242, 192, 0.16);
}

.page-about .about-tl .accordion__trigger {
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.85rem;
  padding: 1.1rem 0;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-tl__year {
  font-family: var(--font-num);
  font-size: clamp(0.98rem, 2.4vw, 1.28rem);
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-tl .is-current .about-tl__year {
  color: var(--teal);
}

.page-about .about-tl__head {
  display: grid;
  gap: 0.22rem;
  min-width: 0;
}

.page-about .about-tl__title {
  font-size: 1rem;
  color: var(--text);
  transition: color 0.18s ease;
}

.page-about .about-tl .accordion__trigger:hover .about-tl__title,
.page-about .about-tl .accordion__trigger:focus-visible .about-tl__title {
  color: var(--teal);
}

.page-about .about-tl__summary {
  font-size: 0.83rem;
  color: var(--muted);
}

.page-about .about-tl__sign {
  width: 9px;
  height: 9px;
  border-right: 1px solid var(--muted);
  border-bottom: 1px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
  flex: 0 0 auto;
}

.page-about .about-tl .accordion__trigger[aria-expanded="true"] .about-tl__sign {
  transform: rotate(-135deg);
}

.page-about .about-tl .accordion__panel-inner {
  padding: 0 0 1.2rem;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-tl .accordion__panel-inner p {
  margin: 0 0 0.6rem;
}

.page-about .about-tl .accordion__panel-inner p:last-child {
  margin-bottom: 0;
}

/* 团队 */
.page-about .about-split {
  display: grid;
  gap: clamp(1.4rem, 3.4vw, 2.4rem);
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-team__card {
  background: var(--module);
  padding: var(--about-pad);
  display: grid;
  gap: 0.55rem;
  align-content: start;
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-team__card:hover {
  background: var(--panel);
  box-shadow: inset 0 0 0 1px var(--teal-deep);
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .about-team__role {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  border: 1px solid var(--edge);
  padding: 0.18rem 0.45rem;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-team__card:hover .about-team__role {
  color: var(--ink);
  background: var(--teal);
  border-color: var(--teal);
}

.page-about .about-team__num {
  font-family: var(--font-num);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1;
  color: var(--teal);
}

.page-about .about-team__num small {
  margin-left: 0.22em;
  font-family: var(--font-body);
  font-size: 0.68rem;
  color: var(--muted);
}

.page-about .about-team__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.08rem;
  color: var(--text);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-team__dist {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.95rem;
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.page-about .about-team__dist span {
  display: inline-flex;
  align-items: baseline;
  gap: 0.32rem;
}

.page-about .about-team__dist b {
  font-family: var(--font-num);
  font-weight: 500;
  color: var(--orange-soft);
}

.page-about .about-org__media,
.page-about .about-eco__media {
  width: 100%;
}

/* 合作生态 */
.page-about .about-eco__body > .about-sub {
  margin-top: 0;
}

.page-about .about-eco__list {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-eco__list li {
  background: var(--module);
  padding: calc(var(--about-pad) * 0.85);
  display: grid;
  gap: 0.45rem;
}

.page-about .about-eco__type {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.96rem;
  color: var(--text);
}

.page-about .about-eco__dot {
  display: inline-block;
  flex: 0 0 auto;
}

.page-about .about-eco__dot--teal {
  width: 10px;
  height: 10px;
  background: var(--teal);
}

.page-about .about-eco__dot--orange {
  width: 8px;
  height: 8px;
  background: var(--orange);
}

.page-about .about-eco__dot--deep {
  width: 6px;
  height: 6px;
  background: var(--teal-deep);
}

.page-about .about-eco__list p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-rhythm {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}

.page-about .about-rhythm li {
  border-left: 2px solid var(--orange);
  padding-left: 0.85rem;
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-rhythm__num {
  display: block;
  font-family: var(--font-num);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--orange-soft);
  margin-bottom: 0.15rem;
}

/* 协作方式 */
.page-about .about-steps {
  list-style: none;
  margin: clamp(1.3rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(1rem, 2.6vw, 1.7rem);
}

.page-about .about-steps li {
  position: relative;
  padding-top: 1rem;
  border-top: 1px solid var(--about-line);
}

.page-about .about-steps li::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 44px;
  height: 2px;
  background: var(--teal);
}

.page-about .about-steps__num {
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-steps h3 {
  margin: 0.5rem 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.05rem;
  color: var(--text);
}

.page-about .about-steps p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-flow__note {
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  padding: 1rem 1.1rem;
  border-left: 2px solid var(--teal-deep);
  background: var(--module);
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--muted);
}

/* 收尾 */
.page-about .about-cta {
  display: grid;
  gap: 1.2rem;
  border: 1px solid var(--edge);
  background:
    linear-gradient(120deg, rgba(54, 242, 192, 0.1), transparent 58%),
    var(--module);
  padding: clamp(1.5rem, 4vw, 2.8rem);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-cta p {
  margin: 0.7rem 0 0;
  max-width: 54ch;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--muted);
}

@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-team__card--edit {
    grid-column: span 4;
  }

  .page-about .about-team__card--tech {
    grid-column: span 2;
  }

  .page-about .about-team__card--cs {
    grid-column: span 2;
  }

  .page-about .about-team__card--coop {
    grid-column: span 4;
  }

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

  .page-about .about-audience {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.4rem 1.2rem;
    align-items: baseline;
  }

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

  .page-about .about-rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .about-cta .about-actions {
    margin-top: 0;
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-rail: 3.4rem;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-split--eco {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }

  .page-about .about-org__media,
  .page-about .about-eco__media {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

  .page-about .about-tl .accordion__trigger {
    padding: 1.3rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-team__role,
  .page-about .about-tl__title,
  .page-about .about-tl__sign {
    transition: none;
  }
}
<<<END>>>