.page-about {
  --about-radius: 20px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 44px;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(200, 16, 46, .10), rgba(200, 16, 46, 0) 62%),
    linear-gradient(170deg, #FFFFFF 0%, var(--mist) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: linear-gradient(
    90deg,
    var(--red) 0 38%,
    var(--red-deep) 38% 48%,
    var(--navy) 48% 66%,
    var(--cyan) 66% 74%,
    var(--line) 74% 100%
  );
}

.page-about .about-hero__grid {
  row-gap: 30px;
  align-items: start;
  margin-top: 18px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 9vw, 64px);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  max-width: 54ch;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(16, 24, 32, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 窄注释栏 */

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

.page-about .about-rail__panel {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #FFFFFF 0%, var(--mist) 100%);
}

.page-about .about-rail__panel--accent {
  border-color: rgba(200, 16, 46, .22);
  background: linear-gradient(160deg, #FFFFFF 0%, rgba(200, 16, 46, .06) 100%);
}

.page-about .about-rail__text {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-big {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 46px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -.04em;
  color: var(--red);
}

.page-about .about-big span {
  font-size: 22px;
  margin-left: 2px;
}

.page-about .about-facts {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__label {
  font-size: 13px;
  color: var(--slate);
}

.page-about .about-facts__value {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-statline {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin: 10px 0 0;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
  color: var(--slate);
}

.page-about .about-statline b {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--red);
  font-weight: 700;
}

/* ---------- 章节头 ---------- */

.page-about .about-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 26px;
}

.page-about .about-head .section-title {
  margin: 6px 0 0;
}

.page-about .chapter-rule + .section-title {
  margin-top: 8px;
}

/* ---------- 我们做的事 ---------- */

.page-about .about-what {
  background: var(--white);
}

.page-about .about-what .prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(16, 24, 32, .84);
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  row-gap: 28px;
  align-items: start;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .about-role {
  position: relative;
  overflow: hidden;
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--white);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-role::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red), var(--cyan));
  transform: scaleX(.22);
  transform-origin: left;
  transition: transform .45s var(--ease);
}

.page-about .about-role:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.page-about .about-role:hover::after {
  transform: scaleX(1);
}

.page-about .about-role__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 38px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -.04em;
  color: var(--red);
}

.page-about .about-role__unit {
  margin-left: 4px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  color: var(--slate);
}

.page-about .about-role__name {
  margin: 12px 0 6px;
  font-size: 18px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .about-team__note {
  margin: 20px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--red);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(255, 255, 255, .8);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(16, 24, 32, .78);
}

.page-about .about-shot {
  margin: 0;
}

/* ---------- 流程 ---------- */

.page-about .about-flow {
  background: var(--white);
}

.page-about .about-flow__figure {
  margin: 0 0 26px;
}

.page-about .about-flow__tabs .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-flow__tabs .tab {
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--white);
  font: inherit;
  font-size: 14px;
  color: var(--slate);
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-flow__tabs .tab:hover {
  border-color: rgba(200, 16, 46, .4);
  color: var(--red);
}

.page-about .about-flow__tabs .tab[aria-selected="true"] {
  border-color: var(--red);
  background: var(--red);
  color: var(--white);
}

.page-about .about-flow__tabs .tab:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-flow__tabs .tab-panel {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(16, 24, 32, .84);
}

.page-about .about-flow__tabs .tab-panel p {
  margin: 0;
}

/* ---------- 栏目 ---------- */

.page-about .about-cols {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .about-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--white);
}

.page-about .about-col__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--red);
}

.page-about .about-col__title {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-col__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-col__meta {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--slate);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  background: var(--navy);
}

.page-about .about-timeline .section-title {
  color: var(--white);
}

.page-about .about-timeline .chapter-rule {
  color: var(--cyan-soft);
}

.page-about .about-timeline__figure {
  margin: 26px 0 4px;
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 34px 2px 14px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 252px;
  gap: 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-node {
  position: relative;
  padding-top: 30px;
  scroll-snap-align: start;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 0;
  right: -20px;
  height: 2px;
  background: rgba(124, 224, 255, .26);
}

.page-about .about-node:last-child::before {
  right: 46%;
}

.page-about .about-node::after {
  content: "";
  position: absolute;
  top: 1px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 4px rgba(200, 16, 46, .24);
}

.page-about .about-node__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-node__title {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-node__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--on-night);
}

/* ---------- 合作 ---------- */

.page-about .about-coop {
  position: relative;
  overflow: hidden;
  background: var(--white);
}

.page-about .about-coop::after {
  content: "";
  position: absolute;
  top: -70px;
  right: -70px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200, 16, 46, .12), rgba(200, 16, 46, 0) 68%);
  pointer-events: none;
}

.page-about .about-coop__lede {
  max-width: 60ch;
  margin: 0 0 26px;
}

.page-about .about-coop__grid {
  row-gap: 16px;
}

.page-about .about-partner {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  border-top: 3px solid var(--red);
  background: var(--white);
  box-shadow: var(--shadow-card);
}

.page-about .about-partner__title {
  margin: 0;
  font-size: 20px;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-partner__fit {
  display: flex;
  gap: 8px;
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(16, 24, 32, .8);
}

.page-about .about-partner__fit span {
  flex: 0 0 auto;
  padding: 1px 8px;
  border-radius: var(--radius-pill);
  background: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--red);
}

.page-about .about-coop__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-coop__foot p {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-coop__foot a {
  color: var(--red);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 40px 0 60px;
  }

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

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .about-track {
    grid-auto-columns: minmax(230px, 1fr);
    overflow-x: visible;
  }
}

@media (min-width: 1080px) {
  .page-about .about-track {
    grid-auto-columns: minmax(200px, 1fr);
  }
}

@media (max-width: 899px) {
  .page-about .about-track {
    padding-right: 8px;
  }
}
<<<END>>>