.page-about {
  --about-rail-w: 238px;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(14px, 2.6vw, 26px);
}

/* 报头 */
.page-about .about-masthead {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 62px) 0 clamp(30px, 5vw, 68px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 140%;
  background:
    radial-gradient(52% 62% at 8% 12%, rgba(43, 240, 208, 0.16), transparent 68%),
    radial-gradient(46% 58% at 94% 6%, rgba(255, 107, 44, 0.13), transparent 66%);
  pointer-events: none;
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(90, 102, 143, 0.18) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(90, 102, 143, 0.18) 1px, transparent 1px);
  background-size: 84px 84px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), transparent 78%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), transparent 78%);
  pointer-events: none;
}

.page-about .about-masthead__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-masthead__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-title {
  margin: clamp(14px, 2.2vw, 26px) 0 0;
  max-width: 18ch;
  font-size: clamp(34px, 6.6vw, 88px);
  font-weight: 300;
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--text);
}

.page-about .about-lede {
  margin: clamp(16px, 2.4vw, 28px) 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 1.95;
  color: var(--text-body);
}

.page-about .about-masthead__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 52px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-masthead__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px 18px;
  background: rgba(10, 16, 48, 0.88);
}

@media (min-width: 720px) {
  .page-about .about-masthead__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 主体双栏 */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 68px);
  padding-top: clamp(30px, 5vw, 68px);
  padding-bottom: clamp(34px, 5vw, 72px);
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-rail__inner {
  display: none;
}

@media (min-width: 1000px) {
  .page-about .about-rail__inner {
    display: block;
    position: sticky;
    top: 108px;
    padding-right: 20px;
    border-right: 1px solid var(--line-soft);
  }
}

.page-about .about-rail__head {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.page-about .about-rail__head:not(:first-child) {
  margin-top: 28px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0 7px 10px;
  border-left: 2px solid transparent;
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-about .about-rail__list .num {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .about-rail__keys {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-rail__keys li {
  padding: 4px 9px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-dim);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(34px, 6vw, 76px);
  min-width: 0;
}

/* 章节骨架 */
.page-about .about-sec {
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 2.6vw, 30px);
  scroll-margin-top: 112px;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec__no {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 38px);
  font-weight: 400;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-sec__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 30px);
}

@media (min-width: 860px) {
  .page-about .about-sec__body {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .prose {
  color: var(--text-body);
  font-size: clamp(16px, 1.3vw, 17.5px);
  line-height: 1.98;
}

.page-about .prose p {
  margin: 0 0 1.05em;
}

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

.page-about .prose .link-arrow {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 240, 208, 0.4);
}

.page-about .prose .link-arrow:hover,
.page-about .prose .link-arrow:focus-visible {
  border-bottom-color: var(--cyan);
}

/* 旁注 */
.page-about .about-side {
  align-self: start;
  padding: 18px 20px 20px;
  background: var(--surface-2);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
}

.page-about .about-side--amber {
  border-left-color: var(--amber);
}

.page-about .about-side--orange {
  border-left-color: var(--orange);
}

.page-about .about-side__tag {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-side--amber .about-side__tag {
  color: var(--amber);
}

.page-about .about-side--orange .about-side__tag {
  color: var(--orange);
}

.page-about .about-side p:not(.about-side__tag) {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--text-dim);
}

/* 图片 */
.page-about .about-shot {
  margin: 0;
}

.page-about .about-shot .shot__frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
}

.page-about .about-shot .shot__media {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-shot--board .shot__frame {
  aspect-ratio: 3 / 2;
}

.page-about .about-shot--rail .shot__frame {
  aspect-ratio: 7 / 3;
}

.page-about .about-shot--net .shot__frame {
  aspect-ratio: 3 / 2;
}

/* 规则说明归档 */
.page-about .about-archive {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 1.8vw, 20px);
}

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

.page-about .about-archive__item {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 6px 6px 0 rgba(8, 40, 43, 0.72);
}

.page-about .about-archive__title {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--text);
}

.page-about .about-archive__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--text-dim);
}

/* 团队四组 */
.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 1.8vw, 20px);
}

@media (min-width: 700px) {
  .page-about .about-teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-team {
  padding: 20px 20px 22px;
  background: var(--surface-2);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
  transition: border-left-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-team:hover {
  border-left-color: var(--orange);
  background: var(--ink-800);
}

.page-about .about-team__no {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-team__title {
  margin: 8px 0 8px;
  font-size: 19px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-team > p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--text-dim);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-team__list li {
  position: relative;
  padding-left: 14px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-mute);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--slate);
}

/* 时间线轨道 */
.page-about .about-track {
  display: flex;
  gap: clamp(14px, 2vw, 22px);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding: 6px 4px 18px;
  margin: 0 -4px;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-track:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 4px;
}

.page-about .about-track::-webkit-scrollbar {
  height: 4px;
}

.page-about .about-track::-webkit-scrollbar-thumb {
  background: var(--slate);
  border-radius: 2px;
}

.page-about .about-node {
  position: relative;
  flex: 0 0 min(78vw, 268px);
  scroll-snap-align: start;
  padding: 24px 18px 20px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 0;
  width: 28px;
  height: 3px;
  background: var(--amber);
}

.page-about .about-node__year {
  display: block;
  font-size: 26px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-node__title {
  margin: 10px 0 8px;
  font-size: 16.5px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--text);
}

.page-about .about-node p {
  margin: 0;
  font-size: 14px;
  line-height: 1.88;
  color: var(--text-dim);
}

.page-about .about-cadence {
  margin: 0;
  padding-top: 4px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-mute);
}

/* 收尾行动区 */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding: clamp(24px, 3.6vw, 42px);
  background:
    linear-gradient(120deg, rgba(43, 240, 208, 0.12), rgba(255, 107, 44, 0.1)),
    var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

@media (min-width: 760px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.45fr) auto;
    align-items: center;
  }
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 400;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-body);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .about-team {
    transition: none;
  }
}
<<<END>>>