.page-about {
  --about-rule: rgba(16, 28, 44, .12);
  --about-ink-soft: rgba(16, 28, 44, .06);
  display: block;
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .crumbs {
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .about {
  display: block;
}

/* ---------- 报头式首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding: clamp(10px, 2vw, 24px) 0 clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2.05rem, 7.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -.015em;
  color: var(--ink);
  transform: skew(-3deg);
  transform-origin: left bottom;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--flame);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 58ch;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .about-meta {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px clamp(20px, 4vw, 40px);
}

.page-about .about-meta__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 12px;
  border-left: 3px solid var(--about-rule);
}

.page-about .about-meta__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.7rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .about-meta__unit {
  font-size: .62em;
  margin-left: 2px;
  color: var(--stone);
}

.page-about .about-meta__label {
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--stone);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* 站点档案卡 */
.page-about .about-card {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius-l) var(--radius-s) var(--radius-l) var(--radius-s);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-card::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(77, 224, 193, .32), transparent 70%);
  pointer-events: none;
}

.page-about .about-card__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .about-facts {
  margin: 16px 0 0;
  display: grid;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 249, 240, .14);
}

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

.page-about .about-facts dt {
  font-size: .8rem;
  color: var(--paper-70);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .98rem;
  font-weight: 600;
  color: var(--paper);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding-top: clamp(28px, 4vw, 48px);
}

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

.page-about .about-sec {
  padding: clamp(30px, 5vw, 56px) 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-body__main .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  margin-bottom: 14px;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  line-height: 1;
  letter-spacing: .06em;
  color: var(--clay);
  opacity: .78;
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(1.3rem, 3.1vw, 1.95rem);
  line-height: 1.28;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-text {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-70);
}

.page-about .about-text:last-of-type {
  margin-bottom: 0;
}

/* ---------- 01 观赛场景 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-scene {
  background: var(--paper);
  border-top: 3px solid var(--flame);
  border-radius: var(--radius-m) var(--radius-s) var(--radius-m) var(--radius-s);
  padding: 18px 18px 16px;
  box-shadow: var(--shadow-panel);
  transition: box-shadow .22s var(--ease), transform .22s var(--ease);
}

.page-about .about-scene:nth-child(2) {
  border-top-color: var(--mint);
}

.page-about .about-scene:nth-child(3) {
  border-top-color: var(--clay);
}

.page-about .about-scene:hover {
  transform: translateY(-3px);
  box-shadow: 0 26px 50px -38px rgba(16, 28, 44, .9);
}

.page-about .about-scene__title {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-scene__text {
  margin: 0 0 14px;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .about-scene__link {
  display: inline-block;
  font-size: .88rem;
  font-weight: 700;
  color: var(--ember);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* ---------- 02 演进轴 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-node {
  background: var(--paper);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-m);
  padding: 13px 16px;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-node[open] {
  border-color: var(--flame);
  box-shadow: 0 20px 44px -40px rgba(16, 28, 44, .95);
}

.page-about .about-node__sum {
  position: relative;
  padding-right: 24px;
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

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

.page-about .about-node__sum::after {
  content: "＋";
  position: absolute;
  right: 0;
  top: -1px;
  font-size: 1rem;
  color: var(--flame);
}

.page-about .about-node[open] .about-node__sum::after {
  content: "－";
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--flame);
}

.page-about .about-node__name {
  font-size: 1rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-node__body p {
  margin: 10px 0 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ink-70);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  object-fit: cover;
  background: var(--about-ink-soft);
}

.page-about .about-figure--wide img {
  aspect-ratio: 2 / 1;
  border-radius: var(--radius-l) var(--radius-s) var(--radius-l) var(--radius-s);
}

/* ---------- 03 工序 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(18px, 3vw, 26px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-split .about-figure {
  margin: 0;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-step__num {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--about-ink-soft);
  border: 1px solid var(--about-rule);
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 600;
  color: var(--ember);
}

.page-about .about-step__title {
  margin: 4px 0 6px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-step__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ink-70);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-team__block {
  --tint: rgba(240, 78, 35, .10);
  --edge: var(--flame);
  background: var(--tint);
  border-left: 4px solid var(--edge);
  border-radius: var(--radius-s) var(--radius-l) var(--radius-s) var(--radius-l);
  padding: 20px 18px;
  transition: box-shadow .22s var(--ease), transform .22s var(--ease);
}

.page-about .about-team__block:nth-child(2) {
  --tint: rgba(77, 224, 193, .16);
  --edge: var(--mint);
}

.page-about .about-team__block:nth-child(3) {
  --tint: rgba(198, 106, 74, .16);
  --edge: var(--clay);
}

.page-about .about-team__block:hover {
  transform: translateY(-3px);
  box-shadow: 0 24px 46px -40px rgba(16, 28, 44, .9);
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-team__title {
  margin: 8px 0 8px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-team__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--ink-70);
}

/* ---------- 05 标准 ---------- */
.page-about .about-std {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-std__row {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-std__metric {
  font-family: var(--font-mono);
  font-size: 1.22rem;
  font-weight: 600;
  color: var(--flame);
}

.page-about .about-std__desc {
  font-size: .94rem;
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .about-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: clamp(18px, 3vw, 26px) 0 0;
}

.page-about .about-inline-link {
  font-size: .9rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--flame);
  padding-bottom: 2px;
}

.page-about .about-inline-link:hover {
  color: var(--ember);
}

/* ---------- 章节索引栏 ---------- */
.page-about .about-rail {
  border-top: 1px solid var(--about-rule);
  padding-top: 16px;
}

.page-about .about-rail__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--about-ink-soft);
  color: var(--ink);
  font-size: .84rem;
  text-decoration: none;
}

.page-about .about-rail__link span {
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--ember);
}

.page-about .about-rail__link:hover {
  background: rgba(240, 78, 35, .14);
}

.page-about .about-rail__foot {
  margin: 14px 0 0;
  font-size: .84rem;
  color: var(--stone);
}

.page-about .about-rail__foot a {
  color: var(--ember);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 60px);
  padding: clamp(24px, 4.5vw, 46px);
  border-radius: var(--radius-l) var(--radius-s) var(--radius-l) var(--radius-s);
  background: linear-gradient(120deg, var(--grad-a), var(--grad-b) 58%, var(--ember));
  color: #fff;
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  font-weight: 900;
  line-height: 1.25;
  transform: skew(-2deg);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 52ch;
  font-size: .95rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, .9);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 26px);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-std__row {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-scene:nth-child(2) {
    margin-top: 22px;
  }

  .page-about .about-scene:nth-child(3) {
    margin-top: 44px;
  }

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

  .page-about .about-team__block:nth-child(2) {
    margin-top: 18px;
  }

  .page-about .about-team__block:nth-child(3) {
    margin-top: 36px;
  }
}

@media (min-width: 860px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding-top: 40px;
    align-items: start;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    top: 12px;
    left: 0;
    right: 0;
    height: 3px;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--grad-a), var(--grad-b) 45%, var(--mint));
  }

  .page-about .about-node {
    position: relative;
  }

  .page-about .about-node::before {
    content: "";
    position: absolute;
    top: -31px;
    left: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--flame);
    box-shadow: 0 0 0 4px var(--sand);
  }

  .page-about .about-node:nth-child(3)::before {
    background: var(--data-blue);
  }

  .page-about .about-node:nth-child(4)::before {
    background: var(--mint);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.55fr) minmax(250px, .72fr);
    align-items: end;
  }

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) 236px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 88px;
    align-self: start;
    border-top: 0;
    border-left: 1px solid var(--about-rule);
    padding-top: 0;
    padding-left: 20px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
  }

  .page-about .about-rail__link {
    border-radius: var(--radius-s);
    padding: 7px 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scene,
  .page-about .about-team__block,
  .page-about .about-node {
    transition: none;
  }

  .page-about .about-scene:hover,
  .page-about .about-team__block:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>
</main>