.page-about {
  background: var(--bg);
  color: var(--text);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: clamp(26px, 5vw, 54px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% 0;
  background:
    radial-gradient(660px 400px at 84% 4%, rgba(79, 209, 217, 0.14), transparent 68%),
    radial-gradient(520px 360px at 4% 96%, rgba(196, 105, 74, 0.14), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(26px, 5vw, 48px);
}

.page-about .about-hero__kicker {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 16px;
}

.page-about .about-hero__kicker-cn {
  font-size: 13px;
  letter-spacing: 0.24em;
  color: var(--lime);
}

.page-about .about-hero__kicker-en {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--text-mute);
}

.page-about .about-hero__h1 {
  margin: 0 0 20px;
  font-size: clamp(38px, 9vw, 76px);
  line-height: 1.02;
  word-break: break-word;
}

.page-about .about-hero__sub {
  max-width: 34em;
  margin: 0 0 26px;
}

.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__panel {
  padding: clamp(20px, 4vw, 30px);
}

.page-about .about-hero__live {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--text-soft);
}

.page-about .about-hero__facts {
  display: grid;
  gap: 14px;
  margin: 0;
}

.page-about .about-hero__fact {
  display: grid;
  grid-template-columns: minmax(84px, auto) 1fr;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-hero__fact dt {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--text-mute);
}

.page-about .about-hero__fact dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-hero__u {
  font-size: 13px;
  color: var(--text-soft);
}

/* ---------- 章节编号带 ---------- */

.page-about .band {
  margin-bottom: clamp(20px, 3.4vw, 34px);
}

/* ---------- 起点 ---------- */

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

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

.page-about .about-origin__text .h-2 {
  margin-top: 0;
}

.page-about .about-origin__text .annotation {
  display: block;
  margin-top: 20px;
  color: var(--clay);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline__head {
  max-width: 46em;
  margin-bottom: clamp(22px, 4vw, 36px);
}

.page-about .about-timeline__head .h-2 {
  margin-top: 0;
}

.page-about .about-timeline__lead {
  margin-bottom: 0;
}

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

.page-about .about-tl__item {
  position: relative;
  padding-left: 46px;
  padding-bottom: 18px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 44px;
  bottom: -4px;
  width: 1px;
  background: linear-gradient(180deg, rgba(242, 239, 230, 0.24), rgba(242, 239, 230, 0.02));
}

.page-about .about-tl__item:last-child::before {
  display: none;
}

.page-about .about-tl__item::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 18px;
  width: 11px;
  height: 11px;
  background: var(--clay);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.page-about .tl-node {
  background: var(--bg-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 13px) 0, 100% 13px, 100% 100%, 13px 100%, 0 calc(100% - 13px));
  transition: border-color 0.22s ease;
}

.page-about .tl-node[open] {
  border-color: rgba(182, 240, 60, 0.42);
}

.page-about .tl-node__sum {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-node__sum::marker {
  content: "";
}

.page-about .tl-node__sum:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .tl-node__year {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 66px;
  padding: 3px 8px;
  font-size: 15px;
  color: var(--clay);
  background: rgba(196, 105, 74, 0.12);
  border: 1px solid rgba(196, 105, 74, 0.5);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.page-about .tl-node__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
}

.page-about .tl-node__sign {
  position: relative;
  width: 18px;
  height: 18px;
  flex: none;
}

.page-about .tl-node__sign::before,
.page-about .tl-node__sign::after {
  content: "";
  position: absolute;
  background: var(--lime);
  transition: transform 0.24s ease, opacity 0.24s ease;
}

.page-about .tl-node__sign::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-about .tl-node__sign::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
}

.page-about .tl-node[open] .tl-node__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .tl-node__body {
  margin: 0 16px 16px;
  padding: 4px 0 0 18px;
  border-left: 2px solid rgba(182, 240, 60, 0.4);
}

.page-about .tl-node__body .body-text {
  margin: 0;
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-team__text .h-2 {
  margin-top: 0;
}

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

.page-about .about-team__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-team__list li {
  display: grid;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--slate);
}

.page-about .about-team__k {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.page-about .about-team__v {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .about-bars {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-bars__row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "label val"
    "track track";
  gap: 6px 12px;
  align-items: center;
}

.page-about .about-bars__label {
  grid-area: label;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--text-soft);
}

.page-about .about-bars__track {
  grid-area: track;
  height: 9px;
  background: rgba(242, 239, 230, 0.08);
  overflow: hidden;
}

.page-about .about-bars__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--moss), var(--lime));
}

.page-about .about-bars__row:nth-child(1) .about-bars__fill {
  width: 50%;
}

.page-about .about-bars__row:nth-child(2) .about-bars__fill {
  width: 33.4%;
}

.page-about .about-bars__row:nth-child(3) .about-bars__fill {
  width: 16.6%;
}

.page-about .about-bars__val {
  grid-area: val;
  font-size: 19px;
  color: var(--lime);
}

/* ---------- 合作 ---------- */

.page-about .about-partners .h-2 {
  margin-top: 0;
}

.page-about .about-partners__lead {
  max-width: 40em;
  margin-bottom: clamp(24px, 4vw, 38px);
}

.page-about .about-net {
  display: grid;
  gap: 16px;
}

.page-about .about-net__node {
  padding: clamp(20px, 3.6vw, 30px);
  background: var(--bg-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.page-about .about-net__node--data {
  border-top: 2px solid var(--cyan);
}

.page-about .about-net__node--venue {
  border-top: 2px solid var(--moss);
}

.page-about .about-net__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 14px;
}

.page-about .about-net__n {
  color: var(--cream);
}

.page-about .about-net__node--data .about-net__n {
  color: var(--cyan);
}

.page-about .about-net__node--venue .about-net__n {
  color: var(--lime);
}

.page-about .about-net__cat {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--text-soft);
}

.page-about .about-net__node .body-text {
  margin: 0 0 14px;
}

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

.page-about .about-net__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .about-net__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--slate);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-partners__fig {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

/* ---------- 使用面 ---------- */

.page-about .about-scale .h-2 {
  margin-top: 0;
}

.page-about .about-scale__stats {
  display: grid;
  gap: 16px;
  margin: clamp(22px, 3.6vw, 32px) 0 clamp(26px, 4vw, 42px);
}

.page-about .about-scale__stat {
  padding: 20px 18px;
  background: var(--bg-2);
  border-left: 3px solid var(--lime);
}

.page-about .about-scale__figure {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0 0 6px;
}

.page-about .about-scale__unit {
  font-size: 14px;
  color: var(--text-soft);
}

.page-about .about-scale__cap {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--text-mute);
}

.page-about .about-scale__cols {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-scale__col .h-3 {
  margin-top: 0;
}

.page-about .about-scale__col .body-text {
  margin-bottom: 0;
}

.page-about .about-scale__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

/* ---------- 下一步 ---------- */

.page-about .about-next .h-2 {
  margin-top: 0;
}

.page-about .about-next__list {
  list-style: none;
  margin: clamp(22px, 3.6vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-next__item {
  position: relative;
  padding: 22px 20px;
  background: linear-gradient(160deg, rgba(16, 41, 74, 0.9), rgba(6, 14, 26, 0.9));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 15px) 0, 100% 15px, 100% 100%, 15px 100%, 0 calc(100% - 15px));
}

.page-about .about-next__no {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--clay);
}

.page-about .about-next__item .h-3 {
  margin-top: 0;
}

.page-about .about-next__item .body-text {
  margin-bottom: 0;
}

/* ---------- 收尾 ---------- */

.page-about .about-tail {
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-tail__inner {
  display: grid;
  gap: 18px;
  padding: clamp(24px, 4vw, 38px);
  background: linear-gradient(120deg, rgba(255, 91, 58, 0.12), rgba(182, 240, 60, 0.1));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

.page-about .about-tail__line {
  margin: 0;
  font-size: clamp(18px, 3.4vw, 24px);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

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

/* ---------- 侧边目录 ---------- */

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

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

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--text-mute);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .about-rail__link::before {
  content: "";
  width: 14px;
  height: 1px;
  background: currentColor;
  transition: width 0.2s ease;
}

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

.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before {
  width: 24px;
}

/* ---------- 滚动显现 ---------- */

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

.has-js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-bars__row {
    grid-template-columns: minmax(130px, 1fr) 3fr auto;
    grid-template-areas: "label track val";
    gap: 0 18px;
  }

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

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 5fr 7fr;
    align-items: center;
  }

  .page-about .about-team__grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-net {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
  }

  .page-about .about-scale__cols {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-next__list {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1080px) {
  .page-about .about-tl {
    padding-left: 4px;
  }

  .page-about .tl-node__name {
    font-size: 18px;
  }

  .page-about .about-tail__inner {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

@media (min-width: 1460px) {
  .page-about .about-rail {
    display: block;
    position: fixed;
    left: 26px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 6;
  }
}

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

  .page-about .tl-node__sign::before,
  .page-about .tl-node__sign::after,
  .page-about .about-rail__link,
  .page-about .about-rail__link::before {
    transition: none;
  }
}
<<<END>>>