.page-about {
  --about-rail: 220px;
  --about-gap: clamp(24px, 3.2vw, 52px);
  padding-bottom: var(--rhythm);
}

.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 3.6vw, 52px);
  padding-block: clamp(20px, 3vw, 44px) clamp(28px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-hero .h-display {
  margin: 14px 0 18px;
  letter-spacing: 0.04em;
  line-height: 1.18;
}

.page-about .about-hero .lede {
  max-width: 62ch;
  color: var(--slate);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__media {
  margin: 0;
  aspect-ratio: 14 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
  box-shadow: var(--shadow-panel);
}

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

.page-about .media-caption {
  padding: 10px 14px 12px;
  border-top: 1px solid var(--line-soft);
  background: var(--panel);
  color: var(--slate);
}

/* 层叠目录 */
.page-about .about-body {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(28px, 3.6vw, 52px);
}

.page-about .about-index {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--track);
  padding: 18px 18px 16px;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 6px;
  border-left: 2px solid transparent;
  color: var(--paper);
  text-decoration: none;
  font-size: 0.94rem;
  transition: border-color 180ms ease, color 180ms ease, background 180ms ease;
}

.page-about .about-index__num {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--copper);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  border-left-color: var(--cyan);
  background: rgba(71, 243, 208, 0.08);
  color: var(--mist);
}

.page-about .about-index__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  color: var(--slate);
  font-size: 0.8rem;
  line-height: 1.6;
}

/* 章节 */
.page-about .about-content {
  min-width: 0;
}

.page-about .about-section {
  padding-block: clamp(30px, 3.6vw, 52px);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section__kicker {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--copper);
}

.page-about .about-h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(1.32rem, 2.3vw, 1.95rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.32;
  color: var(--paper);
}

.page-about .about-h3 {
  margin: 8px 0 6px;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-section__intro {
  margin: 0 0 6px;
  max-width: 60ch;
  color: var(--slate);
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about .about-cols {
  display: grid;
  gap: clamp(20px, 2.6vw, 36px);
  align-items: start;
}

.page-about .about-aside {
  min-width: 0;
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--amber);
  border-radius: var(--radius-sm);
  background:
    linear-gradient(rgba(71, 243, 208, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(71, 243, 208, 0.05) 1px, transparent 1px),
    var(--panel);
  background-size: 28px 28px, 28px 28px, auto;
}

.page-about .about-aside__label {
  margin: 0 0 6px;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-aside__value {
  margin: 0 0 8px;
  font-family: var(--font-data);
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-aside__desc {
  margin: 0;
  color: var(--slate);
  font-size: 0.82rem;
  line-height: 1.65;
}

/* 里程碑 */
.page-about .about-banner {
  margin: 22px 0 0;
  aspect-ratio: 16 / 7;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
}

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

.page-about .about-tabs {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.page-about .about-tabs .tab {
  appearance: none;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--slate);
  padding: 8px 16px;
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease;
}

.page-about .about-tabs .tab:hover {
  color: var(--mist);
  border-color: var(--line-strong);
}

.page-about .about-tabs .tab[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-timeline > li {
  position: relative;
  padding-bottom: 24px;
}

.page-about .about-timeline > li:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .about-timeline > li.is-key::before {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .about-timeline p {
  margin: 0;
  max-width: 58ch;
  color: var(--slate);
  font-size: 0.9rem;
  line-height: 1.75;
}

.page-about .season-tag {
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(183, 122, 54, 0.16);
  color: var(--amber);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  transform: rotate(-1deg);
}

/* 团队 */
.page-about .about-stats {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  display: grid;
  gap: 3px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
  transition: border-color 180ms ease;
}

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

.page-about .about-stat:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-stat__num {
  font-family: var(--font-data);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__unit {
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-stat__desc {
  margin-top: 2px;
  color: var(--slate);
  font-size: 0.8rem;
  line-height: 1.6;
}

.page-about .about-square {
  margin: clamp(20px, 2.6vw, 32px) 0 0;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
}

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

/* 服务对象 */
.page-about .about-audience {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-audience__item {
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: var(--panel);
  transition: border-color 180ms ease, transform 180ms ease;
}

.page-about .about-audience__item:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .about-audience__who {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-about .about-audience__item > p:last-child {
  margin: 0;
  color: var(--slate);
  font-size: 0.88rem;
  line-height: 1.72;
}

.page-about .about-audience__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  color: var(--slate);
  font-size: 0.85rem;
  line-height: 1.75;
}

/* 继续了解 */
.page-about .about-next__grid {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.page-about .about-next__card {
  display: grid;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--track);
  text-decoration: none;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--cyan);
  background: var(--panel);
  transform: translateY(-2px);
}

.page-about .about-next__card-kicker {
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-next__card-title {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-next__card-desc {
  color: var(--slate);
  font-size: 0.84rem;
  line-height: 1.68;
}

.page-about .about-next__card .link-arrow {
  margin-top: 6px;
  color: var(--cyan);
  font-size: 0.82rem;
}

.page-about .about-next__note {
  margin: 16px 0 0;
  color: var(--slate);
  font-size: 0.85rem;
  line-height: 1.7;
}

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

@media (min-width: 720px) {
  .page-about .about-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-stat {
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line-soft);
    padding-left: 14px;
  }

  .page-about .about-stat:first-child {
    border-left: 0;
    padding-left: 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
  }

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

  .page-about .about-index {
    position: sticky;
    top: 104px;
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1fr) minmax(180px, 240px);
  }

  .page-about .about-aside--wide {
    padding: 18px;
  }

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

  .page-about .about-aside--wide .about-stat {
    border-left: 0;
    border-bottom: 1px solid var(--line-soft);
    padding-left: 0;
    padding-bottom: 12px;
  }

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

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

  .page-about .about-square {
    max-width: 520px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-audience {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-tabs .tab,
  .page-about .about-stat,
  .page-about .about-audience__item,
  .page-about .about-next__card {
    transition: none;
  }

  .page-about .about-audience__item:hover,
  .page-about .about-next__card:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>