.page-about {
  --ab-pad: 20px;
  --ab-hair: rgba(17, 22, 28, 0.16);
  --ab-ink-2: #3c4650;
  --ab-night-ink: rgba(247, 245, 240, 0.78);
  background: var(--paper);
  color: var(--ink);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

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

/* ---------- 面包屑与首屏 ---------- */

.page-about .about-crumb {
  padding-top: 22px;
}

.page-about .about-open {
  padding: 16px 0 48px;
}

.page-about .about-open__inner {
  display: grid;
  gap: 30px;
  align-items: start;
}

.page-about .about-open__kick {
  margin-bottom: 16px;
  padding-left: 11px;
  border-left: 4px solid var(--signal);
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--cyan-deep);
}

.page-about .about-open__lead h1 {
  margin: 0 0 18px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(30px, 7.6vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.page-about .about-open__lead .lede {
  max-width: 46ch;
  margin: 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ab-ink-2);
}

.page-about .about-open__note {
  margin-top: 20px;
  padding-top: 12px;
  border-top: 1px solid var(--ab-hair);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .about-card {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--sand);
  border: var(--line);
  box-shadow: 7px 7px 0 rgba(199, 154, 50, 0.55);
}

.page-about .about-card__k {
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--cyan-deep);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin: 0;
}

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

.page-about .about-facts dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .about-facts dd {
  margin: 4px 0 0;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 23px;
  line-height: 1.15;
  color: var(--ink);
  word-break: break-word;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-sec {
  padding: 52px 0;
}

.page-about .about-sec--last {
  padding-bottom: 72px;
}

.page-about .about-chapter {
  display: grid;
  gap: 20px;
}

.page-about .about-chapter__head h2 {
  margin: 10px 0 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(23px, 5vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 52px;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--cyan-deep);
}

.page-about .about-chapter__k {
  margin: 8px 0 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--stone);
}

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

.page-about .about-chapter__body > p {
  max-width: 62ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ab-ink-2);
}

.page-about .about-chapter__body a {
  color: var(--cyan-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 01 要点 ---------- */

.page-about .about-points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-points li {
  padding-left: 15px;
  border-left: 3px solid var(--cyan);
  font-size: 15px;
  line-height: 1.72;
  color: var(--ab-ink-2);
}

.page-about .about-points strong {
  display: block;
  margin-bottom: 3px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

/* ---------- 02 六层结构 ---------- */

.page-about .about-ladder {
  margin-top: 24px;
  border-top: var(--line);
}

.page-about .about-layer {
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .about-layer__sum {
  display: grid;
  grid-template-columns: 42px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 15px 6px;
  cursor: pointer;
  list-style: none;
  transition: background var(--ease);
}

.page-about .about-layer__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-layer__num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 19px;
  color: var(--cyan-deep);
}

.page-about .about-layer__name {
  margin: 0;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-layer__hint {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--stone);
  white-space: nowrap;
}

.page-about .about-layer__body {
  padding: 0 6px 18px 54px;
}

.page-about .about-layer__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ab-ink-2);
}

.page-about .about-layer[open] .about-layer__sum {
  background: linear-gradient(90deg, rgba(95, 168, 188, 0.2), rgba(95, 168, 188, 0));
}

.page-about .about-layer[open] .about-layer__num {
  color: var(--signal);
}

/* ---------- 03 赛季脉络 ---------- */

.page-about .about-eras {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}

.page-about .about-eras > * {
  min-width: 0;
}

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

.page-about .about-timeline {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding: 4px 4px 16px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .about-timeline:focus-visible {
  outline: 2px solid var(--cyan-deep);
  outline-offset: 3px;
}

.page-about .about-era {
  flex: 0 0 82%;
  scroll-snap-align: start;
  padding: 18px 16px 20px;
  background: var(--paper);
  border: var(--line);
}

.page-about .about-era__t {
  margin: 12px 0 8px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-era__d {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--ab-ink-2);
}

/* ---------- 04 团队 ---------- */

.page-about .about-team__fig {
  margin: 0 0 34px;
}

.page-about .about-team__head {
  align-items: start;
}

.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-role {
  background: var(--paper);
  border: var(--line);
  transition: background var(--ease), border-color var(--ease);
}

.page-about .about-role__sum {
  padding: 16px 14px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-role__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-role__num {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 32px;
  line-height: 1;
  color: var(--cyan-deep);
}

.page-about .about-role__t {
  margin: 8px 0 4px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-role__hint {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .about-role__body {
  padding: 0 14px 16px;
}

.page-about .about-role__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--ab-ink-2);
}

.page-about .about-role[open] {
  background: var(--sand);
  border-color: var(--ink);
}

/* ---------- 05 校对与版本（夜赛蓝分区） ---------- */

.page-about .about-night {
  color: var(--paper);
}

.page-about .about-night .about-chapter__num {
  color: var(--cyan);
}

.page-about .about-night .about-chapter__head h2 {
  color: var(--paper);
}

.page-about .about-night .about-chapter__k {
  color: rgba(247, 245, 240, 0.6);
}

.page-about .about-night .about-chapter__body > p {
  color: var(--ab-night-ink);
}

.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-step {
  padding-top: 14px;
  border-top: 1px solid rgba(247, 245, 240, 0.28);
}

.page-about .about-step__n {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 20px;
  color: var(--gold);
}

.page-about .about-step__t {
  margin: 6px 0 6px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-step__d {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--ab-night-ink);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px dotted rgba(199, 154, 50, 0.6);
}

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

.page-about .about-metric__v {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-metric__k {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: rgba(247, 245, 240, 0.68);
}

.page-about .about-night__foot {
  margin: 30px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ab-night-ink);
}

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

/* ---------- 06 服务地区 ---------- */

.page-about .about-region {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .about-region__txt > p {
  max-width: 60ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ab-ink-2);
}

.page-about .about-addr {
  margin-top: 22px !important;
  padding-left: 14px;
  border-left: 3px solid var(--signal);
  font-size: 15px !important;
  line-height: 1.7;
  color: var(--ink) !important;
}

.page-about .about-region .media-frame {
  margin: 0;
}

/* ---------- 07 生态协作 ---------- */

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

.page-about .about-eco__item {
  padding: 18px 16px 20px;
  background: var(--paper);
  border: var(--line);
  border-top: 4px solid var(--gold);
}

.page-about .about-eco__t {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-eco__d {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--ab-ink-2);
}

.page-about .about-eco__foot {
  max-width: 62ch;
  margin: 24px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 延伸入口 ---------- */

.page-about .about-more__t {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-size: clamp(21px, 4.6vw, 26px);
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-next {
  display: grid;
  gap: 12px;
}

.page-about .about-next__link {
  display: block;
  padding: 16px 15px 18px;
  background: var(--paper);
  border: var(--line);
  text-decoration: none;
  color: var(--ink);
  transition: background var(--ease), border-color var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--sand);
  border-color: var(--cyan-deep);
}

.page-about .about-next__t {
  display: block;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
}

.page-about .about-next__d {
  display: block;
  margin-top: 7px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--stone);
}

/* ---------- 平板 ---------- */

@media (min-width: 680px) {
  .page-about {
    --ab-pad: 28px;
  }

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

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

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

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

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

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about .about-open {
    padding: 26px 0 62px;
  }

  .page-about .about-open__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-card {
    margin-top: 10px;
  }

  .page-about .about-sec {
    padding: 76px 0;
  }

  .page-about .about-chapter {
    grid-template-columns: minmax(180px, 24%) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-chapter__head {
    position: sticky;
    top: calc(var(--head-h) + 26px);
  }

  .page-about .about-chapter__num {
    font-size: 68px;
  }

  .page-about .about-layer__sum {
    grid-template-columns: 52px minmax(0, 1fr) auto;
    padding: 17px 8px;
  }

  .page-about .about-layer__body {
    padding: 0 8px 20px 66px;
    max-width: 70ch;
  }

  .page-about .about-eras {
    grid-template-columns: 272px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-timeline {
    padding-bottom: 20px;
  }

  .page-about .about-era {
    flex: 0 0 286px;
  }

  .page-about .about-team__fig {
    margin-bottom: 42px;
  }

  .page-about .about-team__head {
    grid-template-columns: minmax(180px, 24%) minmax(0, 1fr);
  }

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

  .page-about .about-region {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    gap: 44px;
  }

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

@media (min-width: 1100px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-chapter {
    grid-template-columns: minmax(200px, 22%) minmax(0, 1fr);
  }
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline {
    scroll-behavior: auto;
  }

  .page-about .about-layer__sum,
  .page-about .about-role,
  .page-about .about-next__link {
    transition: none;
  }
}
<<<END>>>