.page-about {
  --ab-pad: clamp(40px, 7vw, 88px);
  --ab-gap: clamp(24px, 4vw, 56px);
  color: var(--text);
}

.page-about .crumbs {
  padding-top: clamp(16px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
  padding: clamp(26px, 5vw, 64px) 0 clamp(40px, 7vw, 96px);
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 5.2vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.page-about .ab-hero__lead {
  margin: 20px 0 0;
  max-width: 40ch;
  color: var(--text-dim);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-hero__stats .stat {
  background: var(--surface);
  padding: 16px 18px;
  margin: 0;
  border: 0;
}

.page-about .ab-hero__stats .stat__value i {
  font-style: normal;
  color: var(--cyan);
  margin-left: 2px;
}

.page-about .ab-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: clamp(24px, 3.6vw, 36px);
}

.page-about .ab-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: var(--fs-sm);
  color: var(--text-dim);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .ab-toc__link .mono {
  color: var(--gold);
  font-size: var(--fs-xs);
  letter-spacing: .08em;
}

.page-about .ab-toc__link:hover,
.page-about .ab-toc__link:focus-visible {
  color: var(--text);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏视觉 ---------- */
.page-about .ab-hero__viz {
  position: relative;
  padding: 18px;
  border: 1px solid var(--line);
  background:
    linear-gradient(140deg, rgba(53, 224, 208, .07), rgba(138, 92, 255, .07)),
    var(--surface);
  overflow: hidden;
}

.page-about .ab-viz {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-viz__grid line {
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .ab-viz__spine {
  fill: none;
  stroke: url(#abVizGrad);
  stroke-width: 2;
}

.page-about .ab-viz__link {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 4 5;
}

.page-about .ab-viz__stop-a { stop-color: var(--cyan); stop-opacity: .95; }
.page-about .ab-viz__stop-b { stop-color: var(--violet); stop-opacity: .8; }

.page-about .ab-viz__node {
  fill: var(--ink-900);
  stroke: var(--cyan);
  stroke-width: 2;
}

.page-about .ab-viz__halo {
  fill: none;
  stroke: var(--gold);
  stroke-width: 1;
  opacity: .65;
}

.page-about .ab-viz__dot {
  fill: var(--gold);
}

.page-about .ab-viz__cap {
  margin: 12px 0 0;
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* ---------- 章节通用 ---------- */
.page-about .ab-chapter {
  position: relative;
  padding: var(--ab-pad) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-chapter::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(90px, 16vw, 180px);
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.page-about .ab-chapter__head {
  display: grid;
  gap: 12px;
  max-width: 76ch;
}

.page-about .ab-chapter__no {
  margin: 0;
  font-size: var(--fs-sm);
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .ab-chapter__title {
  margin: 0;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.2;
}

.page-about .ab-chapter__desc {
  margin: 0;
  max-width: 42ch;
  color: var(--text-dim);
}

/* ---------- 留白呼吸段 ---------- */
.page-about .ab-breather {
  padding: clamp(56px, 11vw, 148px) 0 clamp(48px, 9vw, 120px);
  border-top: 1px solid var(--line);
}

.page-about .ab-breather__text {
  margin: 0;
  max-width: 26ch;
  font-family: var(--font-serif);
  font-size: clamp(22px, 3.4vw, 36px);
  line-height: 1.5;
  color: var(--text);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: clamp(30px, 5vw, 56px) 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(26px, 3.4vw, 42px);
  outline: none;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 10px;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 1px solid var(--line);
  transform: rotate(45deg);
  transition: background-color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-visible::before,
.page-about .tl__item:focus-within::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .tl__item:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .tl__year {
  margin: 0 0 6px;
  font-size: var(--fs-sm);
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .tl__title {
  margin: 0 0 8px;
  font-size: var(--fs-md);
  font-weight: 700;
  color: var(--text);
}

.page-about .tl__text {
  margin: 0;
  max-width: 46ch;
  color: var(--text-dim);
}

.page-about .tl__more {
  margin: 0;
  max-width: 48ch;
  color: var(--text-dim);
  font-size: var(--fs-sm);
  line-height: 1.8;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height .38s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease);
}

.page-about .tl__item:hover .tl__more,
.page-about .tl__item:focus-within .tl__more {
  max-height: 14em;
  opacity: 1;
  margin-top: 10px;
}

.page-about .tl__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, .45);
}

/* ---------- 媒体容器 ---------- */
.page-about .ab-media {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

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

.page-about .ab-media--wide img { aspect-ratio: 2 / 1; }
.page-about .ab-media--tall img { aspect-ratio: 4 / 3; }
.page-about .ab-media--band img { aspect-ratio: 2 / 1; }

.page-about .ab-media figcaption {
  margin-top: 10px;
  font-size: var(--fs-xs);
  color: var(--text-dim);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: var(--ab-gap);
  margin-top: clamp(30px, 5vw, 56px);
  align-items: center;
}

.page-about .ab-team__chart {
  width: min(260px, 68vw);
  margin: 0 auto;
}

.page-about .ab-ring {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-ring__track { stroke: var(--ink-700); }
.page-about .ab-ring__seg--a { stroke: var(--cyan); }
.page-about .ab-ring__seg--b { stroke: var(--gold); }
.page-about .ab-ring__seg--c { stroke: var(--violet); }

.page-about .ab-ring__num {
  fill: var(--text);
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-about .ab-ring__unit {
  fill: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
}

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

.page-about .ab-team__row {
  background: var(--surface);
  padding: 18px 20px;
}

.page-about .ab-team__key {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-weight: 700;
  font-size: var(--fs-md);
}

.page-about .ab-team__val {
  margin-left: auto;
  color: var(--cyan);
  font-size: var(--fs-md);
}

.page-about .ab-dot {
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  display: inline-block;
}

.page-about .ab-dot--cyan { background: var(--cyan); }
.page-about .ab-dot--gold { background: var(--gold); }
.page-about .ab-dot--violet { background: var(--violet); }

.page-about .ab-team__note {
  margin: 10px 0 0;
  color: var(--text-dim);
  font-size: var(--fs-sm);
  line-height: 1.8;
}

/* ---------- 生态 ---------- */
.page-about .ab-eco {
  display: grid;
  gap: var(--ab-gap);
  margin-top: clamp(28px, 4.6vw, 52px);
  align-items: start;
}

.page-about .ab-eco .ab-media {
  margin: 0;
}

.page-about .ab-eco__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-eco__stats .stat {
  background: var(--surface);
  padding: 18px 16px;
  margin: 0;
  border: 0;
}

.page-about .ab-eco__stats .stat__value {
  color: var(--gold);
}

.page-about .ab-eco__stats .stat__value i {
  font-style: normal;
  color: var(--cyan);
}

.page-about .ab-eco__text {
  margin: 20px 0 0;
  max-width: 46ch;
  color: var(--text-dim);
}

.page-about .ab-eco__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, .45);
}

/* ---------- 荣誉 ---------- */
.page-about .ab-honor {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-honor__item {
  background: var(--surface);
  border: 0;
  padding: 22px 22px 24px;
}

.page-about .ab-honor__item .panel__body {
  color: var(--text-dim);
  font-size: var(--fs-sm);
  line-height: 1.8;
}

.page-about .ab-honor__item .panel__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, .45);
}

.page-about .ab-honor__year {
  display: inline-block;
  margin: 0 0 12px;
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-release {
  margin-top: clamp(28px, 4.6vw, 52px);
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

.page-about .ab-release__item {
  border-left: 2px solid var(--line);
  padding-left: clamp(16px, 2.4vw, 24px);
  transition: border-color .25s var(--ease);
}

.page-about .ab-release__item:hover {
  border-left-color: var(--cyan);
}

.page-about .ab-release__num {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 40px);
  letter-spacing: -0.02em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .ab-release__name {
  margin: 10px 0 8px;
  font-size: var(--fs-md);
  font-weight: 700;
}

.page-about .ab-release__desc {
  margin: 0;
  max-width: 44ch;
  color: var(--text-dim);
  font-size: var(--fs-sm);
  line-height: 1.85;
}

/* ---------- 三条主张 ---------- */
.page-about .ab-principles {
  margin-top: clamp(28px, 4.6vw, 52px);
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-principle {
  background: var(--surface);
  border: 0;
  padding: 24px 22px 26px;
}

.page-about .ab-principle__no {
  margin: 0 0 12px;
  font-size: var(--fs-xs);
  letter-spacing: .2em;
  color: var(--violet);
}

.page-about .ab-principle .panel__body {
  color: var(--text-dim);
  font-size: var(--fs-sm);
  line-height: 1.85;
}

.page-about .ab-principle .panel__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, .45);
}

/* ---------- 属地与备案 ---------- */
.page-about .ab-facts {
  margin: clamp(28px, 4.6vw, 48px) 0 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-facts__row {
  background: var(--surface);
  padding: 16px 20px;
  display: grid;
  gap: 6px;
}

.page-about .ab-facts__key {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.page-about .ab-facts__val {
  margin: 0;
  color: var(--text);
  word-break: break-word;
}

.page-about .ab-facts__note {
  margin: 22px 0 0;
  max-width: 52ch;
  color: var(--text-dim);
  font-size: var(--fs-sm);
  line-height: 1.85;
}

.page-about .ab-facts__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, .45);
}

.page-about .ab-chapter--last {
  padding-bottom: clamp(52px, 9vw, 112px);
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .ab-facts__row {
    grid-template-columns: 180px minmax(0, 1fr);
    align-items: baseline;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .ab-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    column-gap: clamp(36px, 6vw, 88px);
  }

  .page-about .ab-hero__viz {
    position: sticky;
    top: 32px;
  }

  .page-about .ab-chapter__head {
    grid-template-columns: 84px minmax(0, 1fr);
    grid-template-areas:
      "no title"
      "no desc";
    column-gap: 28px;
    row-gap: 14px;
    align-items: start;
  }

  .page-about .ab-chapter__no {
    grid-area: no;
    padding-top: 8px;
  }

  .page-about .ab-chapter__title { grid-area: title; }
  .page-about .ab-chapter__desc { grid-area: desc; }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    column-gap: clamp(40px, 6vw, 84px);
  }

  .page-about .ab-team__chart {
    margin: 0;
  }

  .page-about .ab-eco {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    column-gap: clamp(40px, 6vw, 80px);
  }

  .page-about .ab-eco .ab-media {
    margin-top: 42px;
  }

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

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

  .page-about .ab-breather {
    padding-left: clamp(0px, 12vw, 180px);
  }
}

/* ---------- 移动端：时间轴细节常显 ---------- */
@media (max-width: 899px) {
  .page-about .tl__more {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__more,
  .page-about .tl__item::before,
  .page-about .ab-release__item,
  .page-about .ab-toc__link {
    transition: none;
  }
}
<<<END>>>