.page-about {
  --about-hero-h: 200px;
  --about-glow: radial-gradient(58% 78% at 12% 6%, rgba(107, 227, 155, .22), rgba(107, 227, 155, 0) 70%);
  --about-warm: radial-gradient(52% 70% at 88% 100%, rgba(255, 122, 61, .13), rgba(255, 122, 61, 0) 72%);
}

.page-about .breadcrumb {
  padding: 18px 0 0;
}

/* —— 首屏 —— */
.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 460px;
  padding: 96px 0 48px;
  overflow: hidden;
  background: var(--ink);
  isolation: isolate;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-glow);
  pointer-events: none;
  z-index: 1;
}

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

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .46;
  filter: saturate(.85);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(11, 18, 32, .45) 0%, rgba(11, 18, 32, .82) 62%, var(--ink) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero h1 {
  max-width: 16ch;
  margin: 14px 0 0;
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  color: var(--mist);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

/* —— 主体双栏 —— */
.page-about .about-body {
  background:
    var(--about-warm),
    var(--ink);
}

.page-about .about-body .canvas-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

/* 左侧轨道：移动端为横向刻度条 */
.page-about .rail {
  position: relative;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
}

.page-about .rail__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .rail-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .rail-item {
  flex: 0 0 auto;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(20, 30, 51, .6);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: .04em;
  white-space: nowrap;
  cursor: pointer;
  transition: color .24s var(--ease), border-color .24s var(--ease), background-color .24s var(--ease);
}

.page-about .rail-item:hover,
.page-about .rail-item:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
  outline: none;
}

.page-about .rail-item.is-active,
.page-about .rail-item[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 600;
}

.page-about .rail .tick-scale {
  display: none;
}

/* —— 章节 —— */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 72px;
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: 120px;
}

.page-about .about-chapter__head {
  margin-bottom: 20px;
}

.page-about .about-chapter h2 {
  margin: 12px 0 0;
  max-width: 18ch;
}

.page-about .about-chapter p {
  margin: 0 0 1.2em;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.78;
  max-width: 62ch;
}

.page-about .about-chapter p:last-child {
  margin-bottom: 0;
}

/* 图片与图注 */
.page-about .about-figure {
  margin: 26px 0 30px;
}

.page-about .about-figure .media-frame {
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-about .about-figure .media-frame__cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

/* —— 时间线 —— */
.page-about .tl {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-node {
  position: relative;
  padding: 22px 0 22px 30px;
  border-top: 1px solid var(--line);
  transition: background-color .24s var(--ease);
}

.page-about .tl-node:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line-strong);
}

.page-about .tl-node::after {
  content: "";
  position: absolute;
  left: 0;
  top: 30px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 2px solid var(--cyan);
  background: var(--ink);
  transition: border-color .24s var(--ease), box-shadow .24s var(--ease), transform .24s var(--ease);
}

.page-about .tl-node:hover::after,
.page-about .tl-node:focus-within::after {
  border-color: var(--orange);
  box-shadow: 0 0 0 6px rgba(255, 122, 61, .14);
  transform: scale(1.08);
}

.page-about .tl-year {
  display: block;
  font-size: 22px;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: .02em;
  transition: color .24s var(--ease);
}

.page-about .tl-node:hover .tl-year {
  color: var(--orange);
}

.page-about .tl-body h3 {
  margin: 10px 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--white);
  letter-spacing: .01em;
}

.page-about .tl-body p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.74;
  max-width: 56ch;
}

/* —— 团队条形 —— */
.page-about .team-bars {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.page-about .team-bar {
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  transition: opacity .24s var(--ease);
}

.page-about .team-bars:has(.team-bar:hover) .team-bar:not(:hover) {
  opacity: .38;
}

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .team-bar__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  letter-spacing: .02em;
}

.page-about .team-bar__num {
  font-size: 26px;
  color: var(--cyan);
}

.page-about .team-bar__track {
  display: block;
  height: 6px;
  margin: 12px 0 10px;
  border-radius: 999px;
  background: rgba(154, 171, 196, .14);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  width: var(--v, 20%);
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--cyan), var(--grass));
  transition: width .4s var(--ease);
}

.page-about .team-bar:nth-child(even) .team-bar__fill {
  background: linear-gradient(90deg, var(--orange), #ffb066);
}

.page-about .team-bar__desc {
  margin: 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.7;
  max-width: 58ch;
}

/* —— 覆盖范围 —— */
.page-about .reach-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 24px 0 30px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .reach-block {
  padding: 24px 0;
}

.page-about .reach-block + .reach-block {
  border-top: 1px dashed var(--line-strong);
}

.page-about .reach-block__num {
  display: block;
  line-height: 1;
  color: var(--cyan);
}

.page-about .reach-block--alt .reach-block__num {
  color: var(--orange);
}

.page-about .reach-block__label {
  margin: 10px 0 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.7;
  max-width: 40ch;
}

.page-about .reach-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.page-about .reach-list li {
  padding-left: 16px;
  border-left: 2px solid var(--line-strong);
  transition: border-color .24s var(--ease);
}

.page-about .reach-list li:hover {
  border-left-color: var(--orange);
}

.page-about .reach-list h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}

.page-about .reach-list p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.74;
  max-width: 60ch;
}

/* —— 奶油纸引用区 —— */
.page-about .about-creed {
  margin: 22px 0 28px;
  padding: 28px 22px;
  border-radius: var(--radius-l) var(--radius-m) var(--radius-l) var(--radius-s);
  background: var(--paper);
  color: var(--paper-ink);
}

.page-about .creed-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
  counter-reset: creed;
}

.page-about .creed-list li {
  counter-increment: creed;
  padding-top: 16px;
  border-top: 1px solid rgba(26, 21, 18, .18);
}

.page-about .creed-list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .creed-list h3 {
  position: relative;
  margin: 0 0 8px;
  padding-left: 30px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper-ink);
  letter-spacing: .01em;
}

.page-about .creed-list h3::before {
  content: "0" counter(creed);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--orange);
  letter-spacing: .06em;
}

.page-about .creed-list p {
  margin: 0;
  padding-left: 30px;
  color: rgba(26, 21, 18, .78);
  font-size: 14px;
  line-height: 1.76;
}

/* —— 数字一览 —— */
.page-about .about-numbers {
  position: relative;
  background:
    radial-gradient(60% 90% at 80% 0%, rgba(107, 227, 155, .16), rgba(107, 227, 155, 0) 70%),
    var(--ink);
  border-top: 1px solid var(--line);
}

.page-about .fact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 26px;
}

.page-about .fact {
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
}

.page-about .fact__num {
  display: block;
  font-size: 32px;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .fact--orange .fact__num {
  color: var(--orange);
}

.page-about .fact__num small {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .fact__label {
  display: block;
  margin-top: 10px;
  color: var(--mist);
  font-size: 13px;
  line-height: 1.7;
  max-width: 30ch;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

/* —— 平板 —— */
@media (min-width: 640px) {
  .page-about .about-hero {
    min-height: 520px;
    padding: 120px 0 56px;
  }

  .page-about .about-hero h1 {
    font-size: clamp(38px, 5.4vw, 64px);
  }

  .page-about .reach-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .page-about .reach-block + .reach-block {
    border-top: 0;
    border-left: 1px dashed var(--line-strong);
    padding-left: 24px;
    margin-left: 0;
  }

  .page-about .about-creed {
    padding: 36px 32px;
  }

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

/* —— 桌面：左轨道 + 右宽幅 —— */
@media (min-width: 1000px) {
  .page-about .about-hero {
    min-height: 620px;
    padding: 150px 0 72px;
  }

  .page-about .about-body .canvas-split {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .rail {
    position: sticky;
    top: 104px;
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .rail-item {
    padding: 10px 0 10px 16px;
    border: 0;
    border-left: 1px solid var(--line-strong);
    border-radius: 0;
    background: none;
    color: var(--mist);
    font-size: 13px;
    letter-spacing: .06em;
    white-space: normal;
    text-align: left;
  }

  .page-about .rail-item::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 50%;
    width: 1px;
    height: 0;
    background: var(--cyan);
    transform: translateY(-50%);
    transition: height .24s var(--ease);
  }

  .page-about .rail-item {
    position: relative;
  }

  .page-about .rail-item:hover,
  .page-about .rail-item:focus-visible {
    background: none;
    border-color: var(--cyan);
    color: var(--white);
  }

  .page-about .rail-item.is-active,
  .page-about .rail-item[aria-current="true"] {
    background: none;
    color: var(--cyan);
    border-color: var(--cyan);
    font-weight: 600;
  }

  .page-about .rail-item.is-active::before,
  .page-about .rail-item[aria-current="true"]::before {
    height: 100%;
    background: var(--orange);
  }

  .page-about .rail .tick-scale {
    display: flex;
    flex-direction: column;
    gap: 9px;
    margin-top: 26px;
    padding-left: 16px;
  }

  .page-about .rail .tick-scale i {
    display: block;
    width: 14px;
    height: 1px;
    background: var(--line-strong);
  }

  .page-about .rail .tick-scale i:nth-child(3n) {
    width: 24px;
    background: var(--cyan);
  }

  .page-about .about-flow {
    gap: 104px;
  }

  .page-about .tl-node {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 20px;
    padding: 28px 0 28px 44px;
  }

  .page-about .tl-node::before {
    left: 8px;
  }

  .page-about .tl-node::after {
    left: 2px;
    top: 34px;
  }

  .page-about .tl-body h3 {
    margin-top: 0;
  }

  .page-about .tl-year {
    font-size: 26px;
  }

  .page-about .about-creed {
    padding: 44px 42px;
  }

  .page-about .fact-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-body .canvas-split {
    grid-template-columns: 220px minmax(0, 1fr);
  }

  .page-about .about-flow {
    gap: 128px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-item,
  .page-about .tl-node,
  .page-about .tl-node::after,
  .page-about .tl-year,
  .page-about .team-bar,
  .page-about .team-bar__fill,
  .page-about .reach-list li {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --v: 1rem;
}