.page-about {
  --about-indent: clamp(22px, 4vw, 34px);
  --about-gap: clamp(24px, 4vw, 48px);
  background: var(--ice);
  color: var(--ink);
}

/* ===== 开篇 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--ice);
  padding: clamp(26px, 5vw, 54px) 0 clamp(40px, 6vw, 76px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(213, 222, 219, 0.06) 0 1px, transparent 1px 92px),
    repeating-linear-gradient(0deg, rgba(213, 222, 219, 0.045) 0 1px, transparent 1px 92px);
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin: 0 0 clamp(20px, 3vw, 34px);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.page-about .breadcrumb a {
  color: rgba(244, 247, 244, 0.68);
  text-decoration: none;
}

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

.page-about .breadcrumb li {
  color: rgba(244, 247, 244, 0.44);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 5.2vw, 62px);
  line-height: 1.16;
  letter-spacing: 0.02em;
  color: var(--ice);
  max-width: 17em;
}

.page-about .about-hero .eyebrow {
  color: var(--track);
  margin-bottom: clamp(12px, 1.8vw, 20px);
}

.page-about .about-hero .lead {
  margin: 0;
  max-width: 44em;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.9;
  color: rgba(244, 247, 244, 0.78);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid rgba(213, 222, 219, 0.18);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(32px, 5vw, 64px) 0 0;
  padding: 0;
  list-style: none;
  background: rgba(213, 222, 219, 0.2);
  border: 1px solid rgba(213, 222, 219, 0.2);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--ink);
  padding: clamp(16px, 2.2vw, 26px) clamp(14px, 2vw, 22px);
}

.page-about .about-hero__fact-num {
  font-family: var(--font-number);
  font-weight: 700;
  font-size: clamp(30px, 3.6vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--track);
}

.page-about .about-hero__fact-label {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: rgba(244, 247, 244, 0.6);
}

/* ===== 通用小节标题 ===== */
.page-about .about-head {
  max-width: 62ch;
  margin: 0 0 clamp(30px, 4.5vw, 56px);
}

.page-about .about-head h2 {
  margin: 0 0 clamp(12px, 1.8vw, 20px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 3.6vw, 44px);
  line-height: 1.24;
  letter-spacing: 0.02em;
}

.page-about .about-head__lead {
  margin: 0;
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-head--dark h2 {
  color: var(--ice);
}

.page-about .about-head--dark .about-head__lead {
  color: rgba(244, 247, 244, 0.68);
}

.page-about .about-head--dark .eyebrow {
  color: var(--track);
}

/* ===== 时间线 ===== */
.page-about .about-timeline {
  background: var(--ice);
  padding: clamp(48px, 7vw, 104px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 var(--about-indent);
  list-style: none;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: clamp(20px, 3vw, 32px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-timeline__item:first-child {
  border-top: 0;
  padding-top: clamp(12px, 2vw, 20px);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-indent) + 4px);
  top: calc(clamp(20px, 3vw, 32px) + 12px);
  width: 9px;
  height: 9px;
  background: var(--teal);
  transition: background-color 0.25s ease;
}

.page-about .about-timeline__item:first-child::before {
  top: calc(clamp(12px, 2vw, 20px) + 12px);
}

.page-about .about-timeline__item--now::before {
  background: var(--track);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-number);
  font-weight: 700;
  font-size: clamp(34px, 6.4vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--deep);
  transition: color 0.25s ease;
}

.page-about .about-timeline__body h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.1vw, 23px);
  line-height: 1.42;
  color: var(--ink);
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-timeline__side {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--track);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-timeline__item:hover::before {
  background: var(--track);
}

.page-about .about-timeline__item:hover .about-timeline__year {
  color: var(--green);
}

/* ===== 团队 ===== */
.page-about .about-teams-section {
  background: var(--deep);
  color: var(--ice);
  padding: clamp(48px, 7vw, 104px) 0;
}

.page-about .about-teams__layout {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .about-teams {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(213, 222, 219, 0.2);
}

.page-about .about-teams__item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 4px 16px;
  padding: clamp(18px, 2.6vw, 28px) clamp(10px, 1.6vw, 18px);
  border-bottom: 1px solid rgba(213, 222, 219, 0.2);
  transition: background-color 0.25s ease;
}

.page-about .about-teams__item:hover {
  background: rgba(180, 255, 57, 0.07);
}

.page-about .about-teams__count {
  font-family: var(--font-number);
  font-weight: 700;
  font-size: clamp(30px, 3.4vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--track);
}

.page-about .about-teams__name {
  margin: 0;
  align-self: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.4;
  color: var(--ice);
}

.page-about .about-teams__desc {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(244, 247, 244, 0.66);
}

.page-about .about-teams__figure {
  margin: 0;
  border: 1px solid rgba(213, 222, 219, 0.18);
}

/* ===== 服务网络 ===== */
.page-about .about-network-section {
  background: var(--ice);
  padding: clamp(48px, 7vw, 104px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-network {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-network__copy .about-head {
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.page-about .about-network__copy p {
  margin: 0 0 16px;
  max-width: 46em;
  font-size: 16.5px;
  line-height: 1.88;
  color: var(--mist);
}

.page-about .about-network__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-network__stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--ice);
  padding: clamp(14px, 2vw, 22px);
}

.page-about .about-network__stats .num {
  font-family: var(--font-number);
  font-weight: 700;
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-network__stats li span:last-child {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-network__figure {
  margin: 0;
  border: 1px solid var(--line);
}

/* ===== 版本演进 ===== */
.page-about .about-versions-section {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--ice);
  padding: clamp(48px, 7vw, 104px) 0;
}

.page-about .about-versions-section::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(180, 255, 57, 0.07) 0%, transparent 44%);
}

.page-about .about-versions-section .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-versions {
  display: grid;
  gap: clamp(24px, 3.5vw, 40px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-versions__item {
  position: relative;
  padding-top: clamp(20px, 2.6vw, 30px);
  border-top: 1px solid rgba(213, 222, 219, 0.22);
}

.page-about .about-versions__item::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 34px;
  height: 7px;
  background: var(--track);
}

.page-about .about-versions__tag {
  margin: 0 0 clamp(12px, 1.6vw, 18px);
}

.page-about .about-versions__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.46;
  color: var(--ice);
}

.page-about .about-versions__item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 247, 244, 0.7);
}

/* ===== 资质与荣誉 ===== */
.page-about .about-honors-section {
  background: var(--ticket);
  padding: clamp(48px, 7vw, 104px) 0;
  background-image: repeating-linear-gradient(90deg, rgba(6, 31, 30, 0.045) 0 1px, transparent 1px 76px);
}

.page-about .about-honors {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(6, 31, 30, 0.16);
}

.page-about .about-honors > li {
  border-bottom: 1px solid rgba(6, 31, 30, 0.16);
}

.page-about .about-honors__item > summary {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 26px);
  padding: clamp(18px, 2.6vw, 28px) 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-honors__item > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-honors__num {
  flex: none;
  min-width: 1.4em;
  font-family: var(--font-number);
  font-weight: 700;
  font-size: clamp(34px, 4.6vw, 54px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--deep);
}

.page-about .about-honors__text {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-honors__more {
  position: relative;
  flex: none;
  width: 26px;
  height: 26px;
}

.page-about .about-honors__more::before,
.page-about .about-honors__more::after {
  content: "";
  position: absolute;
  background: var(--deep);
}

.page-about .about-honors__more::before {
  left: 0;
  right: 0;
  top: 12px;
  height: 2px;
}

.page-about .about-honors__more::after {
  top: 0;
  bottom: 0;
  left: 12px;
  width: 2px;
  transition: transform 0.2s ease;
}

.page-about .about-honors__item[open] .about-honors__more::after {
  transform: scaleY(0);
}

.page-about .about-honors__body {
  max-width: 62ch;
  padding-bottom: clamp(20px, 2.6vw, 30px);
}

.page-about .about-honors__body p {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--deep);
  font-size: 16px;
  line-height: 1.88;
  color: var(--mist);
}

/* ===== 更新节奏 ===== */
.page-about .about-cadence-section {
  background: var(--ice);
  padding: clamp(48px, 7vw, 104px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-cadence__copy .about-head {
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.page-about .about-cadence__copy p {
  margin: 0 0 16px;
  max-width: 46em;
  font-size: 16.5px;
  line-height: 1.88;
  color: var(--mist);
}

.page-about .about-cadence__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence__list li {
  display: grid;
  grid-template-columns: minmax(92px, 126px) minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: clamp(16px, 2.2vw, 24px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-cadence__list .num {
  font-family: var(--font-number);
  font-weight: 700;
  font-size: clamp(16px, 1.8vw, 20px);
  letter-spacing: -0.01em;
  color: var(--deep);
}

.page-about .about-cadence__list p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ===== 收尾入口 ===== */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--ice);
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -8%;
  top: -30%;
  width: 46%;
  height: 190%;
  pointer-events: none;
  transform: rotate(16deg);
  background: linear-gradient(180deg, rgba(180, 255, 57, 0.1), rgba(180, 255, 57, 0));
}

.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  max-width: 68ch;
}

.page-about .about-cta h2 {
  margin: 0 0 clamp(12px, 1.8vw, 20px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 3.6vw, 42px);
  line-height: 1.24;
  letter-spacing: 0.02em;
  color: var(--ice);
}

.page-about .about-cta p {
  margin: 0 0 clamp(22px, 3vw, 32px);
  font-size: 17px;
  line-height: 1.88;
  color: rgba(244, 247, 244, 0.72);
}

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

/* ===== 响应式 ===== */
@media (min-width: 620px) {
  .page-about .about-teams__item {
    grid-template-columns: 76px minmax(130px, 180px) minmax(0, 1fr);
    align-items: center;
    gap: 4px 22px;
  }

  .page-about .about-teams__desc {
    grid-column: auto;
    margin-top: 0;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: minmax(148px, 0.85fr) minmax(0, 2fr) minmax(170px, 1fr);
    gap: 4px clamp(24px, 3.5vw, 48px);
    align-items: start;
  }

  .page-about .about-timeline__body h3 {
    margin-top: 0;
  }

  .page-about .about-timeline__side {
    margin-top: 4px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6.5fr) minmax(0, 5.5fr);
  }

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

  .page-about .about-cadence {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }
}

@media (min-width: 940px) {
  .page-about .about-network {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    grid-template-areas:
      "copy figure"
      "stats figure";
    align-items: start;
    column-gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-network__copy {
    grid-area: copy;
  }

  .page-about .about-network__stats {
    grid-area: stats;
    align-self: end;
  }

  .page-about .about-network__figure {
    grid-area: figure;
    align-self: start;
  }
}

@media (min-width: 1020px) {
  .page-about .about-teams__layout {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 52px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__year,
  .page-about .about-timeline__item::before,
  .page-about .about-teams__item,
  .page-about .about-honors__more::after {
    transition: none;
  }
}
<<<END>>>