.page-about {
  --about-sticky-top: calc(var(--header-top-h) + 62px);
  --about-band-h: 64px;
  color: var(--text-ink);
}

.page-about .about-hero-wrap {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 20px var(--gutter) 0;
}

.page-about .about-hero .frame__inner {
  padding: 20px 18px 24px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 6vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 10px 0 14px;
  max-width: 24ch;
}

.page-about .about-hero__lead {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--forest-600);
  max-width: 60ch;
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  list-style: none;
  margin: 22px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.3rem, 4vw, 1.9rem);
  font-weight: 600;
  line-height: 1;
  color: var(--ink-800);
}

.page-about .about-hero__stats .stat__label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--forest-600);
}

/* 章节吸附导航 */
.page-about .about-toc {
  position: sticky;
  top: var(--about-sticky-top);
  z-index: 6;
  margin-top: 20px;
  padding: 0 var(--gutter);
  background: var(--paper-050);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-toc__list {
  display: flex;
  gap: 2px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 6px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc .toc-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 10px;
  font-size: 13px;
  color: var(--forest-600);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .about-toc .toc-link:hover,
.page-about .about-toc .toc-link.is-active {
  color: var(--text-ink);
  border-bottom-color: var(--cyan-500);
}

.page-about .about-toc__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber-700);
}

/* 通用章节 */
.page-about h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 4.4vw, 2.25rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 8px 0 0;
  max-width: 26ch;
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  line-height: 1.3;
  margin: 0 0 6px;
}

.page-about .prose p {
  max-width: 62ch;
}

/* 01 主张 */
.page-about .about-mission {
  padding-block: 44px 40px;
}

.page-about .about-mission__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-mission__points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  max-width: 62ch;
}

.page-about .about-mission__points li {
  padding-left: 14px;
  border-left: 2px solid var(--cyan-500);
  font-size: 15px;
  line-height: 1.75;
  color: var(--forest-600);
}

.page-about .about-mission__tag {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-800);
  background: var(--mist-100);
  padding: 2px 6px;
}

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

.page-about .about-mission__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--ink-800);
  aspect-ratio: 3 / 2;
}

.page-about .about-mission__figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--forest-600);
}

/* 色带 */
.page-about .about-band {
  display: flex;
  align-items: center;
  height: var(--about-band-h);
  padding: 0 var(--gutter);
  background: var(--mist-100);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-band__inner {
  display: flex;
  align-items: baseline;
  gap: 14px;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
}

.page-about .about-band__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber-700);
}

.page-about .about-band__text {
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--forest-600);
}

/* 02 赛季历程 */
.page-about .about-seasons {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--paper-050);
  padding-block: 48px;
}

.page-about .about-seasons__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-seasons__bg img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.22;
  filter: saturate(0.55);
}

.page-about .about-seasons > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-seasons h2 {
  color: var(--paper-050);
}

.page-about .about-seasons .section-label {
  color: var(--cyan-300);
}

.page-about .about-seasons__lead {
  margin: 14px 0 28px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-100);
}

.page-about .accordion--timeline {
  position: relative;
  padding-left: 22px;
  border-top: 1px solid rgba(245, 243, 236, 0.16);
}

.page-about .accordion--timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--amber-500), rgba(242, 180, 65, 0.12));
}

.page-about .accordion--timeline .accordion__item {
  position: relative;
  border-bottom: 1px solid rgba(245, 243, 236, 0.16);
}

.page-about .accordion--timeline .accordion__trigger {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "season ver"
    "title icon";
  align-items: center;
  gap: 4px 12px;
  width: 100%;
  padding: 16px 4px 16px 14px;
  position: relative;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease);
}

.page-about .accordion--timeline .accordion__trigger:hover {
  background: rgba(23, 224, 192, 0.06);
}

.page-about .tl-dot {
  position: absolute;
  left: -22px;
  top: 22px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--amber-500);
  transition: background-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.page-about .accordion__trigger[aria-expanded="true"] .tl-dot {
  background: var(--amber-500);
  box-shadow: 0 0 0 4px rgba(242, 180, 65, 0.16);
}

.page-about .tl-season {
  grid-area: season;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-300);
}

.page-about .tl-ver {
  grid-area: ver;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(245, 243, 236, 0.5);
}

.page-about .tl-title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  line-height: 1.3;
  color: var(--paper-050);
}

.page-about .accordion--timeline .accordion__icon {
  grid-area: icon;
  position: relative;
  width: 14px;
  height: 14px;
  justify-self: end;
  align-self: center;
}

.page-about .accordion--timeline .accordion__icon::before,
.page-about .accordion--timeline .accordion__icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: var(--cyan-500);
  transition: transform var(--dur) var(--ease);
}

.page-about .accordion--timeline .accordion__icon::after {
  transform: rotate(90deg);
}

.page-about .accordion__trigger[aria-expanded="true"] .accordion__icon::after {
  transform: rotate(0deg);
}

.page-about .accordion--timeline .accordion__panel {
  padding: 0 4px 18px 14px;
}

.page-about .accordion--timeline .accordion__panel p {
  margin: 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist-100);
  border-left: 2px solid var(--forest-600);
  padding-left: 14px;
}

/* 03 团队 */
.page-about .about-team {
  padding-block: 44px 48px;
}

.page-about .about-team__lead {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--forest-600);
}

.page-about .about-team__grid {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.page-about .team-card {
  padding: 18px 16px 20px;
  background: var(--paper-050);
  transition: transform var(--dur) var(--ease);
}

.page-about .team-card__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber-700);
}

.page-about .team-card__desc {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--forest-600);
}

.page-about .team-card__duties {
  list-style: none;
  margin: 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--line);
  max-height: 420px;
  opacity: 1;
  overflow: hidden;
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), padding-top var(--dur) var(--ease);
}

.page-about .team-card__duties li {
  position: relative;
  padding-left: 14px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-ink);
}

.page-about .team-card__duties li + li {
  margin-top: 6px;
}

.page-about .team-card__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 5px;
  height: 5px;
  background: var(--cyan-500);
}

.page-about .about-team__texture {
  margin: 28px 0 0;
}

.page-about .about-team__texture img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 160px;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--mist-100);
}

.page-about .about-team__texture figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--forest-600);
}

/* 04 质量流程 */
.page-about .about-quality {
  padding-block: 44px 48px;
}

.page-about .about-quality__lead {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--forest-600);
}

.page-about .about-quality__steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .quality-step {
  position: relative;
  padding: 22px 4px 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .quality-step::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 44px;
  height: 2px;
  background: var(--cyan-500);
}

.page-about .quality-step__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber-700);
  margin-bottom: 8px;
}

.page-about .quality-step p {
  margin: 0;
  max-width: 44ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--forest-600);
}

.page-about .about-quality__note {
  margin: 26px 0 0;
  padding: 16px 18px;
  max-width: 62ch;
  background: var(--paper-050);
  border: 1px solid var(--line);
  border-left: 3px solid var(--forest-600);
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-ink);
}

/* 05 合作生态 */
.page-about .about-partners {
  padding-block: 44px 48px;
}

.page-about .about-partners__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-partners__panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  padding: 22px 18px;
  background: var(--ink-800);
  color: var(--paper-050);
  border: 1px solid var(--ink-900);
}

.page-about .about-partners__panel .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-partners__panel .stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.35rem, 4.2vw, 1.85rem);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan-500);
}

.page-about .about-partners__panel .stat__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.03em;
  color: var(--mist-100);
}

/* 06 下一步 */
.page-about .about-next {
  padding-block: 44px 56px;
}

.page-about .about-next__grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .next-card {
  display: block;
  padding: 18px 16px 20px;
  background: var(--paper-050);
  border: 1px solid var(--line);
  border-left: 3px solid var(--forest-600);
  text-decoration: none;
  color: var(--text-ink);
  transition: border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-left-color: var(--cyan-500);
  transform: translateY(-2px);
}

.page-about .next-card__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber-700);
  margin-bottom: 8px;
}

.page-about .next-card__title {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  line-height: 1.3;
  margin-bottom: 6px;
}

.page-about .next-card__desc {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--forest-600);
}

.page-about .about-next__aside {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--forest-600);
  max-width: 62ch;
}

.page-about .about-next__aside a {
  color: var(--ink-800);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-500);
}

.page-about .about-next__aside a:hover {
  color: var(--forest-600);
}

/* 悬停展开职责清单，仅在真正支持悬停的桌面端生效 */
@media (min-width: 900px) and (hover: hover) and (pointer: fine) {
  .page-about .team-card:hover {
    transform: translate(-2px, -4px);
  }

  .page-about .team-card__duties {
    max-height: 0;
    opacity: 0;
    padding-top: 0;
    border-top-color: transparent;
  }

  .page-about .team-card:hover .team-card__duties,
  .page-about .team-card:focus-within .team-card__duties {
    max-height: 420px;
    opacity: 1;
    padding-top: 12px;
    border-top-color: var(--line);
  }
}

@media (min-width: 760px) {
  .page-about .about-hero .frame__inner {
    padding: 26px 28px 30px;
  }

  .page-about .about-mission {
    padding-block: 56px 48px;
  }

  .page-about .about-mission__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-quality__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .quality-step {
    padding-right: 0;
  }

  .page-about .about-team__texture img {
    height: 220px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-wrap {
    padding-top: 28px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1.15fr 1fr 0.85fr;
    gap: 24px;
    align-items: start;
  }

  .page-about .team-card:nth-child(2) {
    margin-top: 24px;
  }

  .page-about .team-card:nth-child(3) {
    margin-top: 48px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-seasons {
    padding-block: 64px;
  }

  .page-about .accordion--timeline .accordion__trigger {
    padding: 18px 8px 18px 18px;
  }

  .page-about .accordion--timeline .accordion__panel {
    padding: 0 8px 20px 18px;
  }

  .page-about .about-team__texture img {
    height: 260px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero .frame__inner {
    padding: 32px 40px 36px;
  }

  .page-about .about-mission__grid {
    gap: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }

  .page-about .next-card:hover,
  .page-about .team-card:hover {
    transform: none;
  }
}
<<<END>>