.page-about {
  --about-rule: rgba(110, 195, 182, .22);
  --about-rule-strong: rgba(110, 195, 182, .46);
  --about-gap: clamp(18px, 2.6vw, 34px);
  display: block;
  background: var(--c-indigo);
  color: var(--c-text);
  padding-bottom: clamp(48px, 8vw, 104px);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(16px, 2.4vw, 26px);
}
.page-about .about-crumb .breadcrumbs {
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(201, 220, 217, .68);
}
.page-about .about-crumb .breadcrumbs a {
  color: var(--c-sky);
  text-decoration: none;
}
.page-about .about-crumb .breadcrumbs a:hover,
.page-about .about-crumb .breadcrumbs a:focus-visible {
  color: var(--c-gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(24px, 4vw, 52px) clamp(36px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -14%;
  width: min(760px, 82vw);
  height: min(660px, 72vh);
  background: var(--grad-route);
  opacity: .2;
  -webkit-clip-path: polygon(30% 0, 100% 0, 100% 74%, 0 100%);
  clip-path: polygon(30% 0, 100% 0, 100% 74%, 0 100%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 46%;
  background: repeating-linear-gradient(
    114deg,
    rgba(110, 195, 182, .07) 0 1px,
    transparent 1px 28px
  );
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 72%);
  mask-image: linear-gradient(180deg, transparent, #000 72%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

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

.page-about .about-hero h1 {
  margin: 12px 0 20px;
  font-size: clamp(2.1rem, 5.4vw, 4.3rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -.012em;
  color: var(--c-paper);
}

.page-about .about-hero__lead {
  max-width: 46ch;
  color: rgba(201, 220, 217, .86);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.85;
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(14px, 3vw, 34px);
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--about-rule-strong);
}

.page-about .about-facts__num {
  font-size: clamp(1.05rem, 1.7vw, 1.3rem);
  font-weight: 600;
  color: var(--c-gold);
  letter-spacing: .01em;
}

.page-about .about-facts__label {
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(201, 220, 217, .66);
}

.page-about .about-hero__cta {
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
  background: var(--c-panel);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 7 / 4;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(16, 31, 60, 0) 45%, rgba(10, 79, 70, .5) 100%);
  pointer-events: none;
}

.page-about .media-caption {
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(201, 220, 217, .55);
  padding-top: 8px;
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    column-gap: clamp(36px, 5vw, 76px);
  }
  .page-about .about-hero__media {
    transform: translateY(clamp(10px, 2.4vw, 34px));
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-block {
  position: relative;
  padding-block: clamp(34px, 5.6vw, 74px);
}

.page-about .about-block + .about-block {
  border-top: 1px solid var(--about-rule);
}

.page-about .about-block__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 36px);
}

.page-about .about-block__head h2 {
  margin: 10px 0 0;
  font-size: clamp(1.55rem, 3vw, 2.6rem);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -.008em;
  color: var(--c-paper);
}

.page-about .about-block__kicker {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-sky);
  border-left: 2px solid var(--c-teal);
  padding-left: 12px;
  max-width: 30ch;
}

.page-about .about-block__body {
  min-width: 0;
  color: rgba(201, 220, 217, .84);
}

.page-about .about-block__body > p {
  margin: 0 0 20px;
  max-width: 68ch;
}

.page-about .about-block__body a {
  color: var(--c-sky);
  text-decoration: none;
  border-bottom: 1px solid rgba(110, 195, 182, .45);
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-block__body a:hover,
.page-about .about-block__body a:focus-visible {
  color: var(--c-gold);
  border-bottom-color: var(--c-gold);
}

@media (min-width: 900px) {
  .page-about .about-block__grid {
    grid-template-columns: minmax(0, 4.2fr) minmax(0, 7fr);
    column-gap: clamp(32px, 5vw, 78px);
    align-items: start;
  }
  .page-about .about-block__head {
    position: sticky;
    top: calc(var(--header-h) + 18px);
  }
  .page-about .about-block--flip .about-block__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4.2fr);
  }
  .page-about .about-block--flip .about-block__head {
    order: 2;
    padding-left: clamp(18px, 2vw, 30px);
    border-left: 1px solid var(--about-rule);
  }
  .page-about .about-block--flip .about-block__head h2,
  .page-about .about-block--flip .about-block__kicker {
    max-width: 100%;
  }
}

/* ---------- 用户场景卡 ---------- */
.page-about .about-scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
}

@media (min-width: 700px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.2vw, 24px);
  border: 1px solid var(--about-rule);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(110, 195, 182, .07), rgba(27, 58, 107, .22));
  transition: transform .25s ease, border-color .25s ease, background-color .25s ease;
}

.page-about .about-card:hover,
.page-about .about-card:focus-within {
  transform: translateY(-3px);
  border-color: rgba(217, 164, 65, .55);
  background: linear-gradient(160deg, rgba(110, 195, 182, .13), rgba(27, 58, 107, .3));
}

.page-about .about-card .card__index {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--c-gold);
}

.page-about .about-card .card__title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-paper);
}

.page-about .about-card .card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(201, 220, 217, .76);
}

.page-about .about-quote {
  margin: 0;
  padding: clamp(18px, 2.6vw, 28px) clamp(18px, 3vw, 34px);
  border-left: 3px solid var(--c-gold);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: linear-gradient(120deg, rgba(110, 195, 182, .16), rgba(27, 58, 107, .3));
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  font-size: clamp(1rem, 1.5vw, 1.16rem);
  line-height: 1.75;
  color: var(--c-paper);
}

/* ---------- 维护机制 ---------- */
.page-about .about-mech {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
}

@media (min-width: 780px) {
  .page-about .about-mech {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

.page-about .about-mech__figure {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--c-panel);
}

.page-about .about-mech__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 5 / 3;
}

.page-about .about-mech__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
  counter-reset: mech;
}

.page-about .about-mech__item {
  position: relative;
  padding: clamp(14px, 2vw, 20px) clamp(14px, 2vw, 22px);
  border-top: 1px solid var(--about-rule);
  transition: background-color .22s ease, border-color .22s ease;
}

.page-about .about-mech__item:last-child {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-mech__item:hover,
.page-about .about-mech__item:focus-within {
  background: rgba(110, 195, 182, .08);
  border-color: var(--about-rule-strong);
}

.page-about .about-mech__no {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--c-amber);
  margin-bottom: 6px;
}

.page-about .about-mech__title {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-paper);
  line-height: 1.5;
}

.page-about .about-mech__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(201, 220, 217, .74);
}

/* ---------- 团队信息 ---------- */
.page-about .about-team {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(13px, 1.8vw, 18px) 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-team__row dt {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--c-gold);
}

.page-about .about-team__row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(201, 220, 217, .82);
}

@media (min-width: 720px) {
  .page-about .about-team__row {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
    gap: clamp(16px, 2.4vw, 30px);
    align-items: baseline;
  }
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__figure {
  margin: 0 0 clamp(24px, 3.4vw, 38px);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--c-panel);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 2 / 1;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: var(--grad-route);
  border-radius: 2px;
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(18px, 2.6vw, 28px);
}

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

.page-about .about-timeline__node {
  position: absolute;
  left: -25px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-indigo);
  border: 2px solid var(--c-sky);
  transition: background-color .22s ease, border-color .22s ease, box-shadow .22s ease;
}

.page-about .about-timeline__item:hover .about-timeline__node,
.page-about .about-timeline__item:focus-within .about-timeline__node {
  background: var(--c-gold);
  border-color: var(--c-gold);
  box-shadow: 0 0 0 6px rgba(217, 164, 65, .16);
}

.page-about .about-timeline__card {
  padding: clamp(12px, 1.8vw, 18px) clamp(14px, 2vw, 22px);
  border: 1px solid transparent;
  border-radius: var(--r-md);
  transition: border-color .22s ease, background-color .22s ease, transform .22s ease;
}

.page-about .about-timeline__item:hover .about-timeline__card,
.page-about .about-timeline__item:focus-within .about-timeline__card {
  border-color: var(--about-rule-strong);
  background: rgba(110, 195, 182, .07);
  transform: translateX(3px);
}

.page-about .about-timeline__card .card__index {
  margin: 0 0 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--c-amber);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-paper);
}

.page-about .about-timeline__card p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(201, 220, 217, .74);
}

/* ---------- 协作生态 ---------- */
.page-about .about-eco {
  margin: 0 0 20px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-eco__group {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-eco__group .disclosure__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: clamp(14px, 2vw, 20px) 0;
  background: none;
  border: 0;
  cursor: pointer;
  color: var(--c-paper);
  text-align: left;
  font: inherit;
  transition: color .2s ease;
}

.page-about .about-eco__group .disclosure__toggle:hover,
.page-about .about-eco__group .disclosure__toggle:focus-visible {
  color: var(--c-gold);
}

.page-about .about-eco__label {
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  font-weight: 600;
  letter-spacing: .01em;
}

.page-about .about-eco__group .disclosure__icon {
  flex: none;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--about-rule-strong);
  border-radius: 50%;
  font-size: 14px;
  color: var(--c-sky);
}

.page-about .about-eco__group .disclosure__body p {
  margin: 0 0 clamp(16px, 2.2vw, 22px);
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(201, 220, 217, .78);
}

.page-about .about-eco__note {
  margin: 0;
  padding: clamp(14px, 2vw, 18px) clamp(16px, 2.2vw, 22px);
  border: 1px dashed var(--about-rule-strong);
  border-radius: var(--r-md);
  background: rgba(110, 195, 182, .05);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(201, 220, 217, .8);
}

/* ---------- 服务原则 ---------- */
.page-about .about-pillars {
  list-style: none;
  margin: 0 0 clamp(26px, 3.6vw, 40px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

@media (min-width: 720px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-pillars__item {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px) clamp(16px, 2.2vw, 24px);
  border-radius: var(--r-md);
  background: var(--grad-route);
  border: 1px solid rgba(110, 195, 182, .3);
  transition: transform .25s ease, box-shadow .25s ease;
}

.page-about .about-pillars__item:hover,
.page-about .about-pillars__item:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-1);
}

.page-about .about-pillars__no {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--c-gold);
  margin-bottom: 10px;
}

.page-about .about-pillars__title {
  margin: 0 0 10px;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 300;
  color: var(--c-paper);
  line-height: 1.2;
}

.page-about .about-pillars__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(247, 250, 248, .84);
}

.page-about .about-cta {
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--about-rule-strong);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(110, 195, 182, .12), rgba(27, 58, 107, .34));
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: clamp(16px, 2.4vw, 28px);
}

.page-about .about-cta__text {
  margin: 0;
  flex: 1 1 320px;
  max-width: 56ch;
  font-size: clamp(.98rem, 1.4vw, 1.08rem);
  line-height: 1.8;
  color: var(--c-paper);
}

/* ---------- 键盘焦点反馈 ---------- */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--c-amber);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* ---------- 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-pillars__item,
  .page-about .about-timeline__card,
  .page-about .about-timeline__node,
  .page-about .about-mech__item {
    transition: none;
  }
  .page-about .about-card:hover,
  .page-about .about-pillars__item:hover,
  .page-about .about-timeline__item:hover .about-timeline__card {
    transform: none;
  }
}
<<<END>>>
</main>