.page-about {
  --about-sec: clamp(56px, 8vw, 112px);
  --about-soft: var(--navy-800);
  position: relative;
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: clamp(14px, 2vw, 24px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 5vw, 56px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: 8%;
  width: 46%;
  height: 76%;
  background: linear-gradient(150deg, rgba(36, 211, 238, 0.14), rgba(255, 107, 26, 0.06) 60%, transparent 85%);
  clip-path: polygon(28% 0, 100% 0, 72% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
  max-width: 1120px;
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(2.6rem, 7vw, 5.5rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-hero .lede {
  max-width: 46ch;
  color: var(--mute);
}

.page-about .about-hero__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: clamp(8px, 1.5vw, 16px);
  max-width: 62ch;
}

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

.page-about .about-hero__cols p:first-child {
  padding-left: 16px;
  border-left: 2px solid var(--orange);
}

.page-about .about-hero .note {
  margin: clamp(8px, 1.4vw, 14px) 0 0;
}

/* ---------- 章节骨架 ---------- */

.page-about .chapter {
  position: relative;
  padding: var(--about-sec) 0;
}

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-split__aside {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 14px;
}

.page-about .about-split__aside .chapter__index {
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1;
  font-weight: 300;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
  opacity: 0.9;
  transition: text-shadow 0.5s var(--ease), color 0.5s var(--ease);
}

.page-about .about-split__aside .chapter__index.is-in {
  text-shadow: 0 0 22px rgba(255, 107, 26, 0.55);
}

.page-about .chapter__rail {
  display: block;
  flex: 1 1 auto;
  min-height: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange) 0%, rgba(108, 123, 166, 0.12) 100%);
}

.page-about .about-split__body {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-split__body .section-head__title {
  margin: 0;
  color: var(--white);
  letter-spacing: -0.02em;
  line-height: 1.14;
}

.page-about .about-split__body .section-head__text {
  margin: 0;
  max-width: 60ch;
  color: var(--mute);
}

/* ---------- 01 出发点 ---------- */

.page-about .about-why__lead {
  max-width: 40ch;
  color: var(--white);
  border-left: 2px solid var(--cyan);
  padding-left: 18px;
}

.page-about .about-why__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: clamp(6px, 1.2vw, 14px);
}

.page-about .about-why__cols p {
  margin: 0;
  color: var(--mute);
}

/* ---------- 02 数据生产 ---------- */

.page-about .about-flow__media {
  margin-top: clamp(28px, 4vw, 52px);
}

.page-about .about-flow__media .media-frame {
  margin: 0;
}

.page-about .flow-strip {
  list-style: none;
  margin: clamp(34px, 5vw, 60px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .flow-step {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--navy-800);
  border: 1px solid rgba(108, 123, 166, 0.28);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  display: grid;
  gap: 8px;
  align-content: start;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .flow-step:hover {
  border-color: var(--cyan);
  transform: translateY(-4px);
}

.page-about .flow-step__num {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .flow-step__title {
  margin: 0;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .flow-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mute);
}

.page-about .flow-step .chip {
  justify-self: start;
  margin-top: 4px;
}

.page-about .about-stats {
  margin-top: clamp(36px, 5vw, 64px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: clamp(20px, 3vw, 32px);
  background: linear-gradient(120deg, rgba(27, 44, 96, 0.9), rgba(10, 22, 51, 0.6));
  border-top: 1px solid rgba(108, 123, 166, 0.3);
  border-bottom: 1px solid rgba(108, 123, 166, 0.3);
}

.page-about .about-stats .stat {
  display: grid;
  gap: 4px;
}

.page-about .about-stats .stat__value {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats .stat--cyan .stat__value {
  color: var(--cyan);
}

.page-about .about-stats .stat--neon .stat__value {
  color: var(--neon);
}

.page-about .about-stats .stat__label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mute);
}

.page-about .about-flow__foot {
  margin-top: 16px;
}

.page-about .about-flow__foot a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 03 团队 ---------- */

.page-about .about-team__photo {
  margin-top: clamp(28px, 4vw, 52px);
}

.page-about .about-team__photo .media-frame {
  margin: 0;
}

.page-about .team-map {
  position: relative;
  margin-top: clamp(30px, 4.5vw, 56px);
}

.page-about .team-map__spine {
  display: none;
}

.page-about .team-map__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .team-node {
  position: relative;
  background: var(--navy-800);
  border: 1px solid rgba(108, 123, 166, 0.3);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .team-node:hover {
  border-color: var(--cyan);
}

.page-about .team-node[open] {
  border-color: var(--orange);
  background: linear-gradient(140deg, rgba(27, 44, 96, 0.95), rgba(18, 34, 77, 0.8));
}

.page-about .team-node__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-node__role {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .team-node__count {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .team-node__body {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--mute);
}

/* ---------- 04 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: clamp(34px, 5vw, 62px) 0 0;
  padding: 0 0 0 4px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--cyan) 55%, rgba(108, 123, 166, 0.14) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-left: 44px;
  margin-bottom: clamp(20px, 3vw, 34px);
  outline: none;
}

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

.page-about .timeline__dot {
  position: absolute;
  left: 4px;
  top: 14px;
  width: 16px;
  height: 16px;
  background: var(--navy-900);
  border: 1px solid var(--orange);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  transition: background 0.3s var(--ease);
}

.page-about .timeline__item:hover .timeline__dot,
.page-about .timeline__item:focus-within .timeline__dot {
  background: var(--orange);
}

.page-about .timeline__item:focus-visible .timeline__dot {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .timeline__card {
  padding: 18px 20px 18px;
  background: linear-gradient(140deg, rgba(27, 44, 96, 0.86), rgba(18, 34, 77, 0.6));
  border: 1px solid rgba(108, 123, 166, 0.28);
  border-left: 2px solid rgba(255, 107, 26, 0.7);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .timeline__item:hover .timeline__card,
.page-about .timeline__item:focus-within .timeline__card {
  border-color: rgba(36, 211, 238, 0.55);
  transform: translateX(6px);
}

.page-about .timeline__year {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  margin-bottom: 6px;
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  color: var(--white);
  letter-spacing: -0.01em;
}

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

.page-about .timeline__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 14px;
  line-height: 1.7;
  color: var(--line);
  transition: max-height 0.42s var(--ease), opacity 0.3s var(--ease), margin-top 0.3s var(--ease);
}

.page-about .timeline__item:hover .timeline__more,
.page-about .timeline__item:focus-within .timeline__more {
  max-height: 160px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 05 社群 ---------- */

.page-about .about-community__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-community__media .media-frame {
  margin: 0;
}

.page-about .about-community__index {
  display: block;
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1;
  font-weight: 300;
  color: var(--violet);
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  margin-bottom: 4px;
}

.page-about .about-community__index.is-in {
  text-shadow: 0 0 22px rgba(123, 92, 255, 0.5);
}

.page-about .about-community__body {
  display: grid;
  gap: 14px;
}

.page-about .about-community__body .section-head__title {
  margin: 0;
  color: var(--white);
  letter-spacing: -0.02em;
  line-height: 1.14;
}

.page-about .about-community__body .lede {
  margin: 0;
  max-width: 44ch;
  color: var(--mute);
}

.page-about .about-community__list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-community__list li {
  padding: 16px 0;
  border-top: 1px solid rgba(108, 123, 166, 0.24);
  font-size: 15px;
  line-height: 1.76;
  color: var(--mute);
}

.page-about .about-community__list li:last-child {
  border-bottom: 1px solid rgba(108, 123, 166, 0.24);
}

.page-about .about-community__k {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--neon);
  margin-bottom: 6px;
}

.page-about .about-community__list a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-community__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* ---------- 06 协作 ---------- */

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(24px, 3.5vw, 44px);
}

.page-about .about-partners__cols {
  display: grid;
  gap: 16px;
}

.page-about .about-partners__cols p {
  margin: 0;
  color: var(--mute);
  max-width: 62ch;
}

.page-about .about-partners__panel {
  padding: 22px 24px;
  background: var(--navy-800);
}

.page-about .about-partners__panel-title {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-partners__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-partners__links li {
  display: grid;
  gap: 4px;
}

.page-about .about-partners__links a {
  color: var(--white);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid rgba(108, 123, 166, 0.5);
  justify-self: start;
  padding-bottom: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

.page-about .about-partners__links span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--line);
}

.page-about .about-partners__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__cols {
    grid-template-columns: 1fr 1fr;
    gap: clamp(20px, 3vw, 40px);
    max-width: none;
  }

  .page-about .about-why__cols {
    grid-template-columns: 1fr 1fr;
    gap: clamp(20px, 3vw, 40px);
  }

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

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

  .page-about .about-partners__links li {
    grid-template-columns: 12ch 1fr;
    gap: 14px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-split__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
  }

  .page-about .chapter__rail {
    width: 1px;
    min-height: 90px;
  }

  .page-about .about-hero__cols {
    max-width: 76ch;
  }

  .page-about .about-team__photo {
    padding-left: clamp(0px, 4vw, 56px);
  }

  .page-about .team-map__spine {
    display: block;
    position: absolute;
    left: 50%;
    top: 16px;
    bottom: 16px;
    width: 1px;
    background: linear-gradient(180deg, var(--cyan), rgba(123, 92, 255, 0.7) 60%, rgba(108, 123, 166, 0.1));
    z-index: 0;
  }

  .page-about .team-map__grid {
    position: relative;
    z-index: 1;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px clamp(48px, 7vw, 104px);
  }

  .page-about .team-node::after {
    content: "";
    position: absolute;
    top: 24px;
    width: clamp(24px, 4vw, 56px);
    height: 1px;
    background: rgba(108, 123, 166, 0.45);
  }

  .page-about .team-node:nth-child(odd)::after {
    right: calc(-1 * clamp(48px, 7vw, 104px));
  }

  .page-about .team-node:nth-child(even)::after {
    left: calc(-1 * clamp(48px, 7vw, 104px));
  }

  .page-about .timeline::before {
    left: 11px;
  }

  .page-about .timeline__item:nth-child(odd) {
    margin-right: clamp(0px, 6vw, 88px);
  }

  .page-about .timeline__item:nth-child(even) {
    margin-left: clamp(24px, 4vw, 64px);
    margin-right: 0;
  }

  .page-about .about-community__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-community__body {
    padding-top: 8px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-partners__cols {
    grid-column: 1 / -1;
    grid-template-columns: 1fr 1fr;
    gap: clamp(20px, 3vw, 44px);
  }

  .page-about .about-partners__actions {
    grid-column: 1 / -1;
    justify-content: flex-start;
  }
}

@media (min-width: 1080px) {
  .page-about .flow-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(16px, 2vw, 28px);
    padding-top: 34px;
  }

  .page-about .flow-strip::before {
    content: "";
    position: absolute;
    top: 12px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--neon) 0%, rgba(36, 211, 238, 0.7) 45%, rgba(108, 123, 166, 0.14) 100%);
  }

  .page-about .flow-strip {
    position: relative;
  }

  .page-about .flow-step::before {
    content: "";
    position: absolute;
    top: -26px;
    left: 0;
    width: 10px;
    height: 10px;
    background: var(--neon);
    clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  }

  .page-about .about-flow__media {
    padding-right: clamp(0px, 6vw, 96px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-step,
  .page-about .timeline__card,
  .page-about .timeline__more,
  .page-about .timeline__dot,
  .page-about .about-split__aside .chapter__index {
    transition: none;
  }

  .page-about .flow-step:hover,
  .page-about .timeline__item:hover .timeline__card,
  .page-about .timeline__item:focus-within .timeline__card {
    transform: none;
  }

  .page-about .timeline__more {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
}
<<<END>>>