.page-about {
  --about-rail: 208px;
  --about-space: clamp(56px, 8vw, 108px);
  display: block;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(84px, 12vw, 128px) 0 clamp(40px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 560px;
  pointer-events: none;
  background:
    radial-gradient(58% 78% at 18% 0%, rgba(34, 230, 255, 0.16), transparent 70%),
    radial-gradient(52% 70% at 92% 12%, rgba(255, 122, 26, 0.12), transparent 72%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(36px, 5vw, 64px);
  align-items: center;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--mute);
}

.page-about .about-crumb__link {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

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

.page-about .about-crumb__sep {
  color: var(--line);
}

.page-about .about-crumb__current {
  color: var(--paper);
}

.page-about .about-hero__kicker {
  margin: 26px 0 0;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.2vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 58ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
  margin: 34px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__fact dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute);
}

.page-about .about-hero__fact dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-hero__fact:first-child dd {
  color: var(--cyan);
}

/* 首屏数据板 */
.page-about .about-hero__visual {
  position: relative;
  min-width: 0;
}

.page-about .replay-board {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(160deg, rgba(11, 21, 36, 0.97), rgba(5, 10, 20, 0.99));
  box-shadow: var(--shadow-island);
}

.page-about .replay-board::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.45;
  background-image: linear-gradient(rgba(36, 54, 77, 0.35) 1px, transparent 1px);
  background-size: 100% 28px;
}

.page-about .replay-board > * {
  position: relative;
  z-index: 1;
}

.page-about .replay-board__bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 10, 20, 0.55);
}

.page-about .replay-board__dots {
  display: flex;
  gap: 6px;
}

.page-about .replay-board__dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line);
}

.page-about .replay-board__dots span:first-child {
  background: var(--orange);
}

.page-about .replay-board__meta {
  margin-left: auto;
  font-size: 12px;
  color: var(--mute);
}

.page-about .replay-board__body {
  padding: 18px;
}

.page-about .replay-row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 34px;
  gap: 12px;
  align-items: center;
  padding: 10px 0;
}

.page-about .replay-row__label {
  font-size: 13px;
  color: var(--mute);
}

.page-about .replay-row__bar {
  position: relative;
  display: block;
  height: 8px;
  border-radius: var(--radius-pill);
  background: rgba(36, 54, 77, 0.9);
  overflow: hidden;
}

.page-about .replay-row__bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--w, 50%);
  border-radius: inherit;
  background: linear-gradient(90deg, var(--cyan), rgba(34, 230, 255, 0.22));
}

.page-about .replay-row--orange .replay-row__bar::after {
  background: linear-gradient(90deg, var(--orange), rgba(255, 122, 26, 0.2));
}

.page-about .replay-row--gold .replay-row__bar::after {
  background: linear-gradient(90deg, var(--gold), rgba(245, 196, 81, 0.2));
}

.page-about .replay-row__num {
  font-size: 14px;
  text-align: right;
  color: var(--paper);
}

.page-about .replay-board__foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--mute);
}

.page-about .replay-chip {
  position: absolute;
  top: -14px;
  right: 10px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--glass-strong);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-island);
}

.page-about .replay-chip__num {
  font-size: 15px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .replay-chip__label {
  font-size: 12px;
  color: var(--mute);
}

/* ---------- 主体：索引轨道 + 内容 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  padding-bottom: var(--about-space);
}

.page-about .about-rail {
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 4px;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--mute);
}

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

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--glass);
  color: var(--mute);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--ink-900);
  border-color: var(--cyan);
  background: var(--cyan);
}

.page-about .about-rail__num {
  font-size: 11px;
  opacity: 0.75;
}

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

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-top: var(--about-space);
}

.page-about .about-section:first-child {
  padding-top: 0;
}

.page-about .about-section__index {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-section__index::after {
  content: "";
  flex: 1;
  max-width: 140px;
  height: 1px;
  background: var(--line);
}

.page-about .about-section__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.8vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-section__body {
  margin-top: 22px;
}

.page-about .about-section__body--tight {
  margin-top: 26px;
}

.page-about .about-section__body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mute);
}

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

/* 玻璃摘要卡 */
.page-about .about-note {
  margin-top: 28px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--glass);
  backdrop-filter: blur(14px);
}

.page-about .about-note__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-note__list {
  display: grid;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-note__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
}

.page-about .about-note__list .num {
  color: var(--cyan);
  font-size: 13px;
}

/* 图文错位 */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  margin-top: 26px;
}

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

.page-about .about-split__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mute);
}

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

.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--ink-800);
}

.page-about .about-figure--wide {
  margin-top: 32px;
}

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

.page-about .about-figure__caption {
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
  border-top: 1px solid var(--line);
}

/* 工作流 */
.page-about .about-flow {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__item {
  position: relative;
  padding: 0 0 22px 30px;
  border-left: 1px solid var(--line);
}

.page-about .about-flow__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-flow__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
}

.page-about .about-flow__item:last-child::before {
  border-color: var(--orange);
}

.page-about .about-flow__step {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-flow__item p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}

/* 时间轴 */
.page-about .about-timeline {
  margin-top: 28px;
}

.page-about .about-timeline__list {
  display: grid;
  gap: 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 28px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 22px;
  bottom: -24px;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__item:last-child::after {
  display: none;
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.6vw, 27px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .about-timeline__detail {
  margin-top: 8px;
}

.page-about .about-timeline__detail summary {
  position: relative;
  padding-right: 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline__detail summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: -1px;
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-about .about-timeline__detail[open] summary::after {
  content: "–";
}

.page-about .about-timeline__detail p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}

/* 版本卡片 */
.page-about .about-card {
  margin-top: clamp(28px, 4vw, 44px);
  padding: 24px 22px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(155deg, rgba(11, 21, 36, 0.98), rgba(5, 10, 20, 0.98));
  box-shadow: var(--shadow-island);
}

.page-about .about-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-card__tag {
  display: inline-block;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(245, 196, 81, 0.45);
  background: rgba(245, 196, 81, 0.12);
  font-size: 12px;
  color: var(--gold);
}

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

.page-about .about-card__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 23px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-card__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
  margin: 20px 0 0;
}

.page-about .about-card__stat dt {
  font-size: 12px;
  color: var(--mute);
}

.page-about .about-card__stat dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-card__text {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-card__link {
  display: inline-block;
  margin-top: 18px;
  font-size: 14px;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease);
}

.page-about .about-card__link:hover,
.page-about .about-card__link:focus-visible {
  border-bottom-color: var(--orange);
}

/* 团队数字 */
.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(138px, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-team__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 18px;
  background: var(--ink-800);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  color: var(--paper);
}

.page-about .about-team__stat:nth-child(2) .about-team__num {
  color: var(--cyan);
}

.page-about .about-team__stat:nth-child(3) .about-team__num {
  color: var(--orange);
}

.page-about .about-team__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mute);
}

.page-about .about-inline-link {
  display: inline-block;
  margin-top: 4px;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease);
}

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

/* 联系信任 */
.page-about .about-trust {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-trust__main {
  padding: 24px 22px;
  background: var(--ink-800);
}

.page-about .about-trust__lead {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-contact {
  display: grid;
  gap: 12px;
  margin: 0;
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
}

.page-about .about-contact__row dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mute);
}

.page-about .about-contact__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .about-contact__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 230, 255, 0.3);
}

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

.page-about .about-trust__aside {
  padding: 24px 22px;
  background: var(--glass);
  backdrop-filter: blur(14px);
}

.page-about .about-trust__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-trust__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* 下一页入口 */
.page-about .about-next {
  margin-top: var(--about-space);
  padding-top: 30px;
  border-top: 1px solid var(--line);
}

.page-about .about-next__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 23px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-next__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 16px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--ink-800);
  text-decoration: none;
  transition: transform 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .about-next__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-next__text {
  grid-column: 1;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-next__arrow {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  font-size: 18px;
  color: var(--orange);
}

/* 滚动入场 */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-card__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }

  .page-about .about-split--flip .about-split__media {
    order: -1;
  }

  .page-about .about-trust {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 18px;
    padding-top: 30px;
  }

  .page-about .about-timeline__list::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    height: 1px;
    background: var(--line);
  }

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

  .page-about .about-timeline__item {
    padding-left: 0;
  }

  .page-about .about-timeline__item::before {
    left: 0;
    top: -30px;
  }

  .page-about .about-timeline__item::after {
    display: none;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 112px;
    overflow: visible;
  }

  .page-about .about-rail__list {
    display: grid;
    gap: 6px;
  }

  .page-about .about-rail__link {
    display: flex;
    width: 100%;
    padding: 9px 14px;
    border-radius: 12px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-next__link {
    transition: none;
  }

  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}
<<<END>>>

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