.page-about {
  --ab-rule: rgba(154, 111, 30, .34);
  --ab-rule-soft: rgba(154, 111, 30, .18);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏：专题封面 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(24px, 4vw, 44px) 0 clamp(34px, 5vw, 60px);
  border-bottom: 1px solid var(--ab-rule-soft);
  background:
    radial-gradient(115% 85% at 88% 2%, rgba(200, 16, 46, .34), transparent 56%),
    radial-gradient(70% 66% at 3% 100%, rgba(123, 77, 255, .14), transparent 62%),
    var(--ink);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red), var(--gold) 42%, var(--violet));
  opacity: .82;
}
.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}
.page-about .about-hero__kicker::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 3px rgba(200, 16, 46, .22);
}
.page-about .about-hero__title {
  margin: 0 0 22px;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.8vw, 68px);
  line-height: 1.08;
  letter-spacing: -.02em;
  text-wrap: balance;
}
.page-about .about-hero__title em {
  font-style: normal;
  color: var(--gold);
}
.page-about .about-hero__lead {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--ink-soft);
}
.page-about .about-hero__index {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--ab-rule);
  display: flex;
  flex-wrap: wrap;
  gap: 10px clamp(16px, 3vw, 34px);
}
.page-about .about-hero__index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 3px;
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.page-about .about-hero__index a:hover,
.page-about .about-hero__index a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--copper);
}
.page-about .about-hero__index .num {
  font-size: 11px;
  color: var(--gold-dim);
}

/* ---------- 共同：纵向分区与栏目标题 ---------- */
.page-about .about-band {
  padding: clamp(46px, 6.5vw, 88px) 0;
}
.page-about .about-band--dark {
  background: var(--ink);
  color: var(--paper);
}
.page-about .about-band--coal {
  background: var(--coal);
  color: var(--paper);
}
.page-about .about-band--paper {
  --ab-rule: rgba(154, 111, 30, .44);
  --ab-rule-soft: rgba(154, 111, 30, .22);
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 6px 20px;
  margin-bottom: clamp(22px, 3vw, 36px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ab-rule);
}
.page-about .about-head__kicker {
  grid-column: 1;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
}
.page-about .about-head__title {
  grid-column: 1;
  margin: 0;
  max-width: 22em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 38px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: inherit;
}
.page-about .about-head__slot {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: end;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gold-dim);
  white-space: nowrap;
}
.page-about .about-band--paper .about-head__kicker { color: var(--copper); }
.page-about .about-band--paper .about-head__slot { color: var(--smoke); }
.page-about .about-head--onred .about-head__kicker { color: rgba(247, 241, 231, .84); }
.page-about .about-head--onred .about-head__title { color: var(--paper); }
.page-about .about-head--onred .about-head__slot { color: rgba(247, 241, 231, .72); }
.page-about .about-head--onred { border-bottom-color: rgba(247, 241, 231, .28); }

/* ---------- 时间轴 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}
.page-about .about-split__annot {
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--gold-dim);
  justify-self: start;
}
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(28px, 4vw, 46px) 26px;
  border-left: 1px solid var(--ab-rule-soft);
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--copper);
  transition: background-color 260ms var(--ease), box-shadow 260ms var(--ease);
}
.page-about .about-timeline__item.is-revealed::before {
  background: var(--jade);
  box-shadow: 0 0 0 4px rgba(23, 185, 120, .14);
}
.page-about .about-timeline__year {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--gold);
}
.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.32;
}
.page-about .about-timeline__text {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-soft);
}
.page-about .about-timeline__media {
  margin: 18px 0 0;
  max-width: 320px;
  border: 1px solid var(--ab-rule-soft);
}
.page-about .about-timeline__tip {
  display: block;
  margin: 14px 0 0;
  padding-left: 10px;
  border-left: 2px solid var(--copper);
  font-size: 13px;
  color: var(--gold-dim);
  transition: opacity 200ms var(--ease), transform 200ms var(--ease);
}

/* ---------- 三件正事 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ab-rule);
}
.page-about .about-lines__row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(20px, 3vw, 32px) 0;
  border-bottom: 1px solid var(--ab-rule-soft);
}
.page-about .about-lines__row::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 1px;
  background: var(--gold);
  transition: width 340ms var(--ease);
}
.page-about .about-lines__row:hover::after,
.page-about .about-lines__row:focus-within::after {
  width: 100%;
}
.page-about .about-lines__idx {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--copper);
}
.page-about .about-lines__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.35;
  color: var(--ink);
}
.page-about .about-lines__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--paper-dim);
}
.page-about .about-lines__meta {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--copper);
}

/* ---------- 团队 ---------- */
.page-about .about-team__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.5vw, 44px);
  align-items: start;
}
.page-about .about-team__lead {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}
.page-about .about-team__fig {
  margin: 0;
}
.page-about .about-team__bands {
  list-style: none;
  margin: clamp(32px, 4.5vw, 56px) 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-rule-soft);
}
.page-about .about-team__band {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ab-rule-soft);
  transition: background-color 200ms var(--ease), padding-left 200ms var(--ease);
}
.page-about .about-team__band::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gold);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 240ms var(--ease);
}
.page-about .about-team__band:hover {
  background: rgba(229, 181, 75, .07);
  padding-left: 12px;
}
.page-about .about-team__band:hover::before {
  transform: scaleY(1);
}
.page-about .about-team__idx {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--gold-dim);
}
.page-about .about-team__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--paper);
}
.page-about .about-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  margin: 0;
  border-top: 1px solid var(--ab-rule);
}
.page-about .about-rhythm__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px 24px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: 1px solid var(--ab-rule-soft);
}
.page-about .about-rhythm__freq {
  justify-self: start;
  align-self: start;
  padding: 3px 8px 3px 0;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--ink);
  background: linear-gradient(transparent 60%, rgba(229, 181, 75, .58) 60%);
}
.page-about .about-rhythm__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.35;
  color: var(--ink);
}
.page-about .about-rhythm__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--paper-dim);
}

/* ---------- 运营数字 ---------- */
.page-about .about-numbers {
  position: relative;
  overflow: hidden;
  padding: clamp(46px, 6.5vw, 88px) 0;
  background: linear-gradient(118deg, var(--red) 0%, var(--red-deep) 100%);
  color: var(--paper);
}
.page-about .about-numbers::before {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -68%;
  width: 62%;
  height: 150%;
  background: radial-gradient(circle, rgba(229, 181, 75, .26), transparent 68%);
  pointer-events: none;
}
.page-about .about-numbers .wrap {
  position: relative;
}
.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(247, 241, 231, .24);
  border: 1px solid rgba(247, 241, 231, .24);
}
.page-about .about-stats__item {
  padding: clamp(18px, 2.6vw, 28px);
  background: rgba(18, 16, 15, .16);
}
.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.08;
  color: var(--gold);
}
.page-about .about-stats__unit {
  margin-left: 3px;
  font-size: .46em;
  letter-spacing: .04em;
  color: rgba(247, 241, 231, .84);
}
.page-about .about-stats__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(247, 241, 231, .86);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__lead {
  margin: 0 0 clamp(24px, 3.5vw, 38px);
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 44px);
  align-items: center;
}
.page-about .about-eco__map {
  width: 100%;
}
.page-about .about-eco__map svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}
.page-about .about-eco__link {
  fill: none;
  stroke: var(--copper);
  stroke-width: 1.4;
  stroke-dasharray: 5 6;
  transition: stroke 220ms var(--ease), stroke-width 220ms var(--ease);
}
.page-about .about-eco__dot {
  fill: var(--coal);
  stroke: var(--copper);
  stroke-width: 1.6;
  transition: fill 220ms var(--ease), stroke 220ms var(--ease);
}
.page-about .about-eco__core {
  fill: var(--red);
  stroke: var(--gold);
  stroke-width: 2;
}
.page-about .about-eco__node text,
.page-about .about-eco__core-label {
  fill: var(--ink-soft);
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: .04em;
}
.page-about .about-eco__core-label {
  fill: var(--gold);
  font-weight: 700;
}
.page-about .about-eco__node:hover .about-eco__link,
.page-about .about-eco__node:focus-within .about-eco__link {
  stroke: var(--violet);
  stroke-width: 2.2;
  stroke-dasharray: none;
}
.page-about .about-eco__node:hover .about-eco__dot,
.page-about .about-eco__node:focus-within .about-eco__dot {
  fill: var(--jade);
  stroke: var(--jade);
}
.page-about .about-eco__fig {
  margin: 0;
}

/* ---------- 服务时段与来信 ---------- */
.page-about .about-reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.5vw, 48px);
}
.page-about .about-reach__lead {
  margin: 0 0 clamp(20px, 2.6vw, 28px);
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}
.page-about .about-reach__list {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: 0;
  border-top: 1px solid var(--ab-rule-soft);
}
.page-about .about-reach__line {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  padding: 13px 0;
  border-bottom: 1px solid var(--ab-rule-soft);
}
.page-about .about-reach__key {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold-dim);
}
.page-about .about-reach__val {
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}
.page-about .about-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-reach__side {
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--ab-rule);
  background: rgba(229, 181, 75, .05);
}
.page-about .about-reach__side-title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--ab-rule-soft);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--gold);
}
.page-about .about-reach__hints {
  margin: 0 0 18px;
  padding: 0 0 0 16px;
  list-style: none;
}
.page-about .about-reach__hints li {
  position: relative;
  padding: 5px 0 5px 14px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-soft);
}
.page-about .about-reach__hints li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--violet);
}
.page-about .about-reach__side-note {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--ab-rule-soft);
  font-size: 13px;
  line-height: 1.78;
  color: var(--smoke);
}
.page-about .about-reach__side-note a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--copper);
}
.page-about .about-reach__side-note a:hover,
.page-about .about-reach__side-note a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--gold);
}

/* ---------- 进入视口显现 ---------- */
.page-about [data-reveal] {
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
}
.page-about [data-reveal].is-hidden {
  opacity: 0;
  transform: translateY(16px);
}
.page-about [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 窄屏适配 ---------- */
@media (max-width: 620px) {
  .page-about .about-head {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-head__slot {
    grid-column: 1;
    grid-row: auto;
    justify-self: start;
  }
  .page-about .about-timeline__media {
    max-width: none;
  }
}

@media (max-width: 420px) {
  .page-about .about-hero__index {
    gap: 8px 18px;
  }
  .page-about .about-team__band {
    grid-template-columns: 28px minmax(0, 1fr);
  }
}

/* ---------- 宽屏栅格 ---------- */
@media (min-width: 720px) {
  .page-about .about-team__band {
    grid-template-columns: 44px 190px minmax(0, 1fr);
    align-items: baseline;
    column-gap: 20px;
  }
  .page-about .about-reach__line {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    column-gap: 16px;
  }
}

@media (min-width: 780px) {
  .page-about .about-rhythm__item {
    grid-template-columns: 160px minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 820px) {
  .page-about .about-lines__row {
    grid-template-columns: 56px 180px minmax(0, 1fr);
    column-gap: clamp(16px, 2.4vw, 30px);
    row-gap: 8px;
    align-items: baseline;
  }
  .page-about .about-lines__idx { grid-column: 1; grid-row: 1; }
  .page-about .about-lines__title { grid-column: 2; grid-row: 1; }
  .page-about .about-lines__text { grid-column: 3; grid-row: 1; }
  .page-about .about-lines__meta { grid-column: 3; grid-row: 2; }
}

@media (min-width: 860px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: 54px minmax(0, 1fr);
    column-gap: clamp(20px, 3vw, 40px);
  }
  .page-about .about-team__top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }
  .page-about .about-eco {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
  .page-about .about-reach {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  }
}

/* ---------- 悬停揭示 ---------- */
@media (hover: hover) {
  .page-about .about-timeline__tip {
    opacity: 0;
    transform: translateX(-6px);
  }
  .page-about .about-timeline__item:hover .about-timeline__tip,
  .page-about .about-timeline__item:focus-within .about-timeline__tip {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .about-timeline__tip,
  .page-about .about-timeline__item::before,
  .page-about .about-lines__row::after,
  .page-about .about-team__band,
  .page-about .about-team__band::before {
    transition: none !important;
  }
  .page-about .about-timeline__tip {
    opacity: 1;
    transform: none;
  }
}
<<<END>>>