.page-about {
  --about-axis: 28px;
  --about-ink-soft: rgba(242, 236, 225, .76);
}

/* ---------- 焦点可见性 ---------- */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 面包屑与页面导语 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  margin: 0 0 clamp(20px, 3.4vw, 32px);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--line-paper);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--teal-deep);
  border-bottom-color: var(--teal-deep);
}

.page-about .page-head__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--teal-deep);
  margin: 0 0 14px;
}

.page-about .page-head__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.6vw, 62px);
  line-height: 1.08;
  letter-spacing: -.02em;
  margin: 0 0 clamp(16px, 2.6vw, 26px);
  max-width: 18em;
}

.page-about .page-head__lead {
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
  color: var(--ink-2);
  max-width: 40em;
  margin: 0;
}

/* ---------- 章节快捷索引 ---------- */
.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: 18px;
  border-top: 1px solid var(--line-paper);
}

.page-about .about-jump__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 13px;
  font-size: 14px;
  line-height: 1.2;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--line-paper);
  background: transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-jump__link:hover {
  background: var(--gold-soft);
  border-color: var(--gold);
}

.page-about .about-jump__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--teal-deep);
}

/* ---------- 章节头（覆盖共享默认） ---------- */
.page-about .section-head__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--teal-deep);
}

.page-about .section-head__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.14;
  letter-spacing: -.02em;
  max-width: 20em;
}

.page-about .section-head__lead {
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--ink-2);
  max-width: 42em;
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-about .about-origin__body p {
  margin: 0 0 1.2em;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-keylist {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-paper);
}

.page-about .about-keylist__item {
  display: grid;
  grid-template-columns: 7.5em minmax(0, 1fr);
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-paper);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-keylist__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  padding-top: 3px;
}

.page-about .about-keylist__v {
  color: var(--ink);
}

/* ---------- 图片 ---------- */
.page-about .about-shot {
  margin: 0;
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-paper);
  background: var(--paper-2);
}

.page-about .about-shot__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-shot--banner {
  margin-top: clamp(30px, 5vw, 56px);
  padding-top: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--line-paper);
}

.page-about .about-shot--banner img {
  aspect-ratio: 16 / 9;
}

/* ---------- 02 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: clamp(26px, 4vw, 46px);
  padding-left: var(--about-axis);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 169, 97, .45) 58%, rgba(201, 169, 97, .12) 100%);
}

.page-about .about-phase {
  position: relative;
  padding-bottom: clamp(30px, 5vw, 52px);
}

.page-about .about-phase::before {
  content: "";
  position: absolute;
  left: calc(var(--about-axis) * -1 - 5px);
  top: 8px;
  width: 11px;
  height: 11px;
  background: var(--paper);
  border: 1px solid var(--gold);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .section--paper2 .about-phase::before {
  background: var(--paper-2);
}

.page-about .about-phase:hover::before {
  background: var(--gold);
}

.page-about .about-phase__era {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--teal-deep);
  margin-bottom: 8px;
}

.page-about .about-phase__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.2vw, 32px);
  line-height: 1.2;
  letter-spacing: -.02em;
  margin: 0 0 12px;
}

.page-about .about-phase__text {
  margin: 0;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-phase__aside {
  margin-top: 16px;
  padding: 16px 18px;
  background: var(--gold-soft);
  border-left: 3px solid var(--gold);
}

.page-about .section--paper2 .about-phase__aside {
  background: var(--paper);
}

.page-about .about-aside__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--steel);
  margin: 0 0 5px;
}

.page-about .about-aside__val {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--ink);
  margin: 0;
}

.page-about .about-aside__note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-2);
}

/* ---------- 03 运营组织 ---------- */
.page-about .section--ink .section-head__num {
  color: var(--gold);
}

.page-about .section--ink .section-head__title {
  color: var(--paper);
}

.page-about .section--ink .section-head__lead {
  color: var(--about-ink-soft);
}

.page-about .about-orgs {
  display: grid;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .about-org {
  padding: 22px 20px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line-ink);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-org:hover {
  transform: translateY(-3px);
  border-color: var(--gold);
  background: #2A2F3B;
}

.page-about .about-org__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gold);
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line-ink);
}

.page-about .about-org__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.25;
  letter-spacing: -.02em;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .about-org__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* ---------- 04 空间体验标准 ---------- */
.page-about .about-standard {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-about .about-standard__block {
  padding: 0 0 20px;
  margin: 0 0 20px;
  border-bottom: 1px solid var(--line-paper);
}

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

.page-about .about-standard__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.3;
  letter-spacing: -.02em;
  margin: 0 0 10px;
  padding-left: 14px;
  border-left: 3px solid var(--cyan);
}

.page-about .about-standard__block p {
  margin: 0;
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 05 会员体系 ---------- */
.page-about .about-members {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-about .about-members__lead {
  margin: 0 0 26px;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-perks {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-paper);
}

.page-about .about-perk {
  display: grid;
  grid-template-columns: 2.6em minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-paper);
  transition: background var(--dur) var(--ease);
}

.page-about .about-perk:hover {
  background: var(--paper);
}

.page-about .about-perk__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--teal-deep);
  padding-top: 3px;
}

.page-about .about-perk__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.3;
  letter-spacing: -.02em;
  margin: 0 0 6px;
}

.page-about .about-perk__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-members__aside {
  padding: 20px 18px;
  background: var(--paper);
  border-left: 3px solid var(--coral);
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .about-next__card {
  padding: clamp(24px, 3.4vw, 36px);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-next__card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 34px rgba(18, 20, 26, .14);
}

.page-about .about-next__card--ink {
  background: var(--ink);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-next__card--paper {
  background: var(--paper-2);
  border: 1px solid var(--line-paper);
}

.page-about .about-next__kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .about-next__card--paper .about-next__kicker {
  color: var(--teal-deep);
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.22;
  letter-spacing: -.02em;
  margin: 0;
}

.page-about .about-next__text {
  margin: 0 0 6px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-next__card--paper .about-next__text {
  color: var(--ink-2);
}

.page-about .about-next__card .btn {
  margin-top: auto;
}

.page-about .about-next__foot {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-paper);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__foot a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-next__foot a:hover {
  color: var(--teal-deep);
  border-bottom-color: var(--teal-deep);
}

/* ---------- 中等宽度：时间轴双栏 + 组织卡片两列 ---------- */
@media (min-width: 760px) {
  .page-about .about-orgs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-org:nth-child(even) {
    margin-top: 20px;
  }

  .page-about .about-next {
    grid-template-columns: 1.12fr .88fr;
    align-items: stretch;
  }

  .page-about .about-standard {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .about-members {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-members__aside {
    margin-top: 6px;
  }
}

/* ---------- 宽屏：时间轴阶段 = 主轴 + 旁注 ---------- */
@media (min-width: 980px) {
  .page-about {
    --about-axis: 34px;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .about-shot--hero {
    margin-top: 6px;
  }

  .page-about .about-phase {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4.6vw, 64px);
    align-items: start;
  }

  .page-about .about-phase__aside {
    margin-top: 4px;
  }

  .page-about .about-phase__title {
    max-width: 18em;
  }

  .page-about .about-shot--banner img {
    aspect-ratio: 21 / 9;
  }

  .page-about .about-orgs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-org:nth-child(even) {
    margin-top: 22px;
  }
}
<<<END>>>