.page-about {
  --about-gutter: clamp(20px, 4vw, 52px);
  padding-bottom: 32px;
}

/* 面包屑 */
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 20px 0 0;
  font-size: 13px;
  color: var(--muted-ink);
}

.page-about .breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--silver);
}

.page-about .breadcrumb a {
  color: var(--muted-ink);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--violet);
}

/* 通用标题 */
.page-about h2 {
  margin: 10px 0 0;
  font-size: 24px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
  font-weight: 800;
}

.page-about h3 {
  font-weight: 700;
  letter-spacing: -0.005em;
}

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

/* 首屏 */
.page-about .about-hero {
  padding-top: 24px;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 0;
  border: 1px solid var(--line-ink);
  border-radius: var(--radius);
  overflow: hidden;
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__copy {
  padding: 30px 22px 32px;
  background: linear-gradient(152deg, var(--navy) 0%, var(--indigo) 58%, var(--violet) 100%);
  color: var(--moon);
}

.page-about .about-hero__copy .eyebrow {
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-size: 32px;
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--moon);
}

.page-about .about-hero__lead {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(244, 246, 251, 0.86);
  max-width: 46em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 28px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line-light);
}

.page-about .about-hero__facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--silver);
}

.page-about .about-hero__facts dd {
  margin: 6px 0 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--moon);
}

.page-about .about-hero__visual {
  margin: 0;
  background: var(--indigo);
  display: flex;
  flex-direction: column;
}

.page-about .about-hero__visual .media-frame {
  border-radius: 0;
  overflow: hidden;
}

.page-about .about-hero__visual .media-caption {
  padding: 12px 20px 14px;
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--silver);
  background: var(--teal);
}

/* 起点与定位 */
.page-about .about-origin__inner {
  display: grid;
  gap: 24px;
}

.page-about .about-origin__body p {
  margin: 0 0 16px;
  color: var(--ink);
  line-height: 1.8;
}

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

.page-about .about-origin__note {
  padding: 22px;
  background: var(--moon);
  border-top: 2px solid var(--mist);
  border-radius: var(--radius);
}

.page-about .about-origin__note-kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--violet);
}

.page-about .about-origin__note-text {
  margin: 12px 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted-ink);
}

/* 团队 */
.page-about .about-team__head {
  align-items: flex-end;
}

.page-about .about-team__intro {
  margin: 14px 0 0;
  max-width: 60em;
  color: var(--muted-ink);
  line-height: 1.75;
}

.page-about .about-team__grid {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

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

.page-about .team-card {
  border: 1px solid var(--line-ink);
  border-radius: var(--radius);
  background: #ffffff;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.page-about .team-card summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  min-height: 44px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-card summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--muted-ink);
  transition: transform 0.25s var(--ease);
}

.page-about .team-card[open] summary::after {
  content: "+";
  transform: rotate(45deg);
  color: var(--violet);
}

.page-about .team-card summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

.page-about .team-card__num {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--violet);
}

.page-about .team-card__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.005em;
}

.page-about .team-card p {
  margin: 0;
  padding: 0 20px 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted-ink);
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure .media-caption {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted-ink);
}

/* 演进时间轴 */
.page-about .about-timeline__inner {
  display: grid;
  gap: 28px;
}

.page-about .about-timeline__hint {
  margin: 14px 0 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted-ink);
}

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

.page-about .timeline__item {
  position: relative;
  padding: 0 0 32px 30px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: 0;
  width: 1px;
  background: var(--line-ink);
}

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

.page-about .timeline__item:last-child::before {
  display: none;
}

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--moon);
  border: 1px solid var(--mist);
}

.page-about .timeline__item--mark::after {
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .timeline__item--current::after {
  background: var(--signal);
  border-color: var(--signal);
}

.page-about .timeline__year {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .timeline__item--current .timeline__year {
  color: var(--signal);
}

.page-about .timeline__title {
  margin: 8px 0 8px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted-ink);
}

/* 服务区域 */
.page-about .about-region__inner {
  display: grid;
  gap: 28px;
}

.page-about .about-region__lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted-ink);
}

.page-about .about-region__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-region__list li {
  padding: 16px 18px;
  background: var(--moon);
  border-left: 2px solid var(--violet);
  border-radius: var(--radius);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-region__list strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-region__figure {
  margin: 0;
  align-self: start;
}

.page-about .about-region__figure .media-caption {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted-ink);
}

/* 合作 */
.page-about .about-partner__head {
  max-width: 62em;
}

.page-about .about-partner__lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted-ink);
}

.page-about .about-partner__list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-partner__list li {
  background: #ffffff;
  padding: 22px 20px;
}

.page-about .about-partner__list h3 {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-partner__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted-ink);
}

.page-about .about-partner__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 26px;
}

.page-about .about-partner__contact {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--muted-ink);
  word-break: break-word;
}

/* 平板 */
@media (min-width: 720px) {
  .page-about .about-hero__copy {
    padding: 40px 36px;
  }

  .page-about .about-hero h1 {
    font-size: 38px;
  }

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

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

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

/* 桌面 */
@media (min-width: 900px) {
  .page-about h2 {
    font-size: 32px;
  }

  .page-about .about-hero {
    padding-top: 28px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: stretch;
  }

  .page-about .about-hero__copy {
    padding: 52px var(--about-gutter);
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-about .about-hero h1 {
    font-size: 50px;
    max-width: 12em;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
    margin-top: 18px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-width: 30em;
  }

  .page-about .about-hero__visual .media-frame {
    flex: 1 1 auto;
    min-height: 100%;
  }

  .page-about .about-hero__visual img {
    height: 100%;
    object-fit: cover;
  }

  .page-about .about-origin__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    grid-template-areas:
      "head note"
      "body note";
    column-gap: 60px;
    row-gap: 20px;
    align-items: start;
  }

  .page-about .about-origin__head {
    grid-area: head;
  }

  .page-about .about-origin__body {
    grid-area: body;
  }

  .page-about .about-origin__body p {
    font-size: 16px;
  }

  .page-about .about-origin__note {
    grid-area: note;
    padding: 26px 24px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
    margin-top: 32px;
  }

  .page-about .about-timeline__inner {
    grid-template-columns: 260px minmax(0, 1fr);
    column-gap: 64px;
    align-items: start;
  }

  .page-about .about-timeline__aside {
    position: sticky;
    top: 96px;
  }

  .page-about .about-region__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    column-gap: 56px;
    align-items: start;
  }

  .page-about .about-region__lead {
    font-size: 16px;
  }

  .page-about .about-partner__lead {
    font-size: 16px;
  }

  .page-about .about-partner__list li {
    padding: 26px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card summary::after {
    transition: none;
  }
}
<<<END>>>